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Author Topic: C R S  (Read 1584 times)

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Offline Presh514

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C R S
« on: September 02, 2020, 08:51:22 am »
Can someone help with C R S

Offline bismarckmc

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Re: C R S
« Reply #1 on: September 02, 2020, 09:20:57 am »
Please crs
Bismarck

Offline Sidikie Mansaray

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Re: C R S
« Reply #2 on: September 02, 2020, 09:47:01 am »
CRS please

Offline Ambitionuwem

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Re: C R S
« Reply #3 on: September 02, 2020, 09:49:29 am »
CRS

4a) solomons prayer at the time of dedication of the jewish temple is…. “Hear our prayer of dedication on this historic day we gathered together in a solemn assembly”

(8a)
The prayer of the righteous is very powerful in its working (or, operation).” James has just exhorted us to “pray for one another, so that you may be healed.” This may refer to healing from illness, especially illness that may be the result of unconfessed sin. Or, it may refer also to spiritual healing, since James has instructed us to confess our sins to one another. But his point is that whether your need is physical or spiritual, prayer is very powerful. But, he qualifies it. In other words if we have been justified by faith, we stand before God with a righteousness that is not our own. If you think that you can approach God through your righteousness, you do not understand the gospel. The gospel shuts us all up under sin, showing that our own righteousness will never satisfy God’s holy.

(8b)
(ii)It’s built into our very existence. Because we are created in His image, God’ image, we are to mimic Christ-like behavior.

(ii)Prayer is an avenue to resolution, the path to finding an answer to a problem. It provides insight to our dilemmas and tough decisions.

____________
Ini uwem udo

Offline Berrydoll

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Re: IRK
« Reply #4 on: September 02, 2020, 09:55:21 am »
IRK pls

Offline Ezra Newton

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Re: C R S
« Reply #5 on: September 02, 2020, 10:04:32 am »
Pls more

Offline kediamos12

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Re: C R S
« Reply #6 on: September 02, 2020, 10:05:46 am »
Pls complete crs

Offline Daniel200

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Re: C R S
« Reply #7 on: September 02, 2020, 10:16:05 am »
Pls help

Offline bismarckmc

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Re: C R S
« Reply #8 on: September 02, 2020, 10:18:48 am »
*crs obj*

1-10: CBBBDACCDC

11-20: ABADCBCDCC

21-30: A - - B- - ACAB

31-40: CDCCDDBBBB

41-50: BACCDCBDCD
Bismarck

Offline NORTOLA

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Re: C R S
« Reply #9 on: September 02, 2020, 10:25:14 am »
Crk answers please

Offline ellah

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Re: C R S
« Reply #10 on: September 02, 2020, 10:30:40 am »
(8a)
The prayer of the righteous is very powerful in its working (or, operation).” James has just exhorted us to “pray for one another, so that you may be healed.” This may refer to healing from illness, especially illness that may be the result of unconfessed sin. Or, it may refer also to spiritual healing, since James has instructed us to confess our sins to one another. But his point is that whether your need is physical or spiritual, prayer is very powerful. But, he qualifies it. In other words if we have been justified by faith, we stand before God with a righteousness that is not our own. If you think that you can approach God through your righteousness, you do not understand the gospel. The gospel shuts us all up under sin, showing that our own righteousness will never satisfy God’s holy.

(8b)
(ii)It’s built into our very existence. Because we are created in His image, God’ image, we are to mimic Christ-like behavior.

(ii)Prayer is an avenue to resolution, the path to finding an answer to a problem. It provides insight to our dilemmas and tough decisions.

Offline Lowkey080

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Re: C R S
« Reply #11 on: September 02, 2020, 10:38:03 am »
(4a)
(i) He started by exalting God saying "there is no God like you in heaven above or on earth beneath, keeping covenant and steadfast love for your servants who walk before you with all their heart.
(ii) He reminded God of the covenant He kept for David, “that the throne of Israel will always be sat upon by his successor
(iii) He asked God to confirm His words, which He promised his father, David.
(iv) He asked God to regard his prayer and his plea
(v) He asked God for forgiveness
(vi) He asked God to act and judge His servants who comes forward to swear an oath, condemning the guilty by bringing their conduct on their own head, and vindicating the righteous by rewarding them according to their righteousness.
(vi) He asked God to listen to the children of Israel when they plead for forgiveness of their sins
(vi) He asked God to also hearken to foreigners in Israel who calls upon Him.
(vii) He asked God to hear the people of Israel during the time of battle against their enemies.
(viii) He asked God grant compassion in the sight of Israelite's captors, so that they may have compassion on Israelites when captured.


(4b)
(i) By identifying and providing peculiar needs of their society
(ii) By building industries and productive infrastructure capable of creating employment opportunities
(iii) By committing resources to the improvement of human capital through scholarships and grants

Offline Aebz

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Re: C R S
« Reply #12 on: September 02, 2020, 10:44:34 am »
(4a)
Then Solomon stood before the altar of the Lord in front of the whole assembly of Israel, spread out his hands

– toward heaven and said: “Lord, the God of Israel, there is no God like you in heaven above or on earth below—you who keep your covenant of love with your servants who continue wholeheartedly in your way. You have kept your promise to your servant David my father; with your mouth you have promised and with your hand you have fulfilled it—as it is today. “Now Lord, the God of Israel, keep for your servant David my father the promises you made to him when you said, ‘You shall never fail to have a successor to sit before me on the throne of Israel, if only your descendants are careful in all they do to walk before me faithfully as you have done.’ And now, God of Israel, let your word that you promised your servant David my father come true. “But will God really dwell on earth? The heavens, even the highest heaven, cannot contain you. How much less this temple I have built! Yet give attention to your servant’s prayer and his plea for mercy, Lord my God. Hear the cry and the prayer that your servant is praying in your presence this day. May your eyes be open toward this temple night and day, this place of which you said, ‘My Name shall be there,’ so that you will hear the prayer your servant prays toward this place.

(4b)
(i) By identifying and providing peculiar needs of their society
(ii) By building industries and productive infrastructure capable of creating employment opportunities
(iii) By commiting resources to the improvement of human capital through scholarships and grants

Offline Aebz

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Re: C R S
« Reply #13 on: September 02, 2020, 10:45:21 am »
(2a)
After the prayer of Moses to God to appoint a leader to replace him so that a lsrael would not be without a leader. God instructed him to Joshua the son of Nun,a man with the spirit of God and lay his hand upon him. He told Moses to make him stand before Eleazer, the priest and the entire congregation. He should be commissioned before the people and this would make the people to obey himas soon as he becomes a leader.
Prior to the above, Joshua was one of the twelve spies sent out and his courage gave a lot of support to the people . Also, he was a man of faith and through his faith the people actually overcome at the end.

The instructions God gave to Joshua on his assumption of leadership over Israel.
1. God assured Joshua of his victory and success in leadership assignments.
2. The book of the law should not depart from the mouth of Joshua.
3. Joshua should meditate on the book of the law day and night in other to do what is written on it.
4. By doing what is written on the book of the law,he would make his way prosperous Continuation
and success would come to his way.
5. God directed Joshua on how to conquer the city of Jericho and the people were to match against it for seven days.

(2b)
(i)political leaders are expected to be courageous
(ii)Political leaders are expected to lead the people by the law of God
(iii)Political leaders are expected to be good examples before the people that they are leading.

Offline Aebz

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Re: C R S
« Reply #14 on: September 02, 2020, 10:47:04 am »
(6a)
In the evening after Jesus had died on the cross, a wealthy man, named Joseph of Arimathea,who was a disciple of Jesus went to Pilate and requested for the body of Jesus. His request was granted and he took the body of Jesus and laid it in his own tomb. The women disciple Mary Magdalene and other many were there and sat opposite the sepulchre. Soldiers were posted to the tomb to ensure that His body was not stolen by His disciples, in order to tell the people that He has risen. The soldiers did not only guard the tomb,but highly secured it by rolling a stone on it to seal the tomb

(6b)
(i) Excessive/expensive coffin
(ii) Engagement of expensive entertainer

Offline ellah

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Re: C R S
« Reply #15 on: September 02, 2020, 10:55:02 am »
*1a)* Genesis 1 vs 2.
2Now the earth was [1] formless and empty, darkness was over the surface of the deep, and the Spirit of God was hovering over the waters.
3And God said, "Let there be light," and there was light.
4God saw that the light was good, and he separated the light from the darkness.
5God called the light "day," and the darkness he called "night." And there was evening, and there was morning--the first day.
6And God said, "Let there be an expanse between the waters to separate water from water."
7So God made the expanse and separated the water under the expanse from the water above it. And it was so.8God called the expanse "sky." And there was evening, and there was morning--the second day.
9And God said, "Let the water under the sky be gathered to one place, and let dry ground appear." And it was so.
10God called the dry ground "land," and the gathered waters he called "seas." And God saw that it was good.
11Then God said, "Let the land produce vegetation: seed-bearing plants and trees on the land that bear fruit with seed in it, according to their various kinds." And it was so.
12The land produced vegetation: plants bearing seed according to their kinds and trees bearing fruit with seed in it according to their kinds. And God saw that it was good.
13And there was evening, and there was morning--the third day.
14And God said, "Let there be lights in the expanse of the sky to separate the day from the night, and let them serve as signs to mark seasons and days and years,
15and let them be lights in the expanse of the sky to give light on the earth." And it was so.
16God made two great lights--the greater light to govern the day and the lesser light to govern the night. He also made the stars.
17God set them in the expanse of the sky to give light on the earth,
18to govern the day and the night, and to separate light from darkness. And God saw that it was good.
19And there was evening, and there was morning--the fourth day
.20And God said, "Let the water teem with living creatures, and let birds fly above the earth across the expanse of the sky."
21So God created the great creatures of the sea and every living and moving thing with which the water teems, according to their kinds, and every winged bird according to its kind. And God saw that it was good.22God blessed them and said, "Be fruitful and increase in number and fill the water in the seas, and let the birds increase on the earth."
23And there was evening, and there was morning--the fifth day.
24And God said, "Let the land produce living creatures according to their kinds: livestock, creatures that move along the ground, and wild animals, each according to its kind." And it was so.
25God made the wild animals according to their kinds, the livestock according to their kinds, and all the creatures that move along the ground according to their kinds. And God saw that it was good.
26Then God said, "Let us make man in our image, in our likeness, and let them rule over the fish of the sea and the birds of the air, over the livestock, over all the earth, [2] and over all the creatures that move along the ground."
27So God created man in his own image, in the image of God he created him; male and female he created them.
28God blessed them and said to them, "Be fruitful and increase in number; fill the earth and subdue it. Rule over the fish of the sea and the birds of the air and over every living creature that moves on the ground."
29Then God said, "I give you every seed-bearing plant on the face of the whole earth and every tree that has fruit with seed in it. They will be yours for food.
30And to all the beasts of the earth and all the birds of the air and all the creatures that move on the ground--everything that has the breath of life in it--I give every green plant for food." And it was so.
31God saw all that he had made, and it was very good. And there was evening, and there was morning--the sixth day
(4a)
Solomon became the king of isreal after the death of his father ,David. David had,before his death ,instructed Solomon to observe God's laws and work according to His statutes ,as conditions for his success. Solomon loves God and walked in the way of his father.
Solomon's Prayer at the dedication of the temple below

(i)Solomon acknowledged the greatness of God and expressed his gratitude to God for the choice of the David dynasty . He prayed for the confirmation of the promise made to his father ,David.
(ii)He pointed out that the temple was not an attempt to limit or localise God ,since heaven and earth could not contain Him.
(iii)Solomon prayed for the effectiveness of the oath taken in the temple, so that the righteous could be vindicated and the guilty punished
(iv)Solomon prayed for the forgiveness of the nation whenever such request was made in the temple
(v)In the case of scarcity of rain,famine ,locust pestilence or blight due to the people's sins,Solomon prayed for divine forgiveness
(vi)Solomon requested God to grant the prayer of foreigners made in the temple
The dedication of the temple ,the elaborate ceremonies and the all-embracing prayer of Solomon are clearly show his wisdom.

(4b)
(i) By identifying and providing peculiar needs of their society
(ii) By building industries and productive infrastructure capable of creating employment opportunities
(iii) By commiting resources to the improvement of human capital through scholarships and grants
2)

Leadership Lesson #1 - Courage is commanded.
Joshua 1:6-9 - Be strong and courageous, because you will lead these people to inherit the land I swore to their forefathers to give them. Be strong and very courageous. Be careful to obey all the law my servant Moses gave you; do not turn from it to the right or to the left, that you may be successful wherever you go. Do not let this Book of the Law depart from your mouth; meditate on it day and night, so that you may be careful to do everything written in it. Then you will be prosperous and successful. Have I not commanded you? Be strong and courageous. Do not be terrified; do not be discouraged, for the Lord your God will be with you wherever you go.

Leadership Lesson #2 - Call for unity. Always fight together.
Joshua 1:14 - 15 - You are to help your brothers until the Lord gives them rest, as he has done for you, and until they too have taken possession of the land that the Lord your God is giving them. After that, you may go back and occupy your own land, which Moses the servant of the Lord gave you east of the Jordan toward the sunrise.

Joshua reminds the Reubenites, the Gadites and the half-tribe of Manasseh to help their brothers win their battles across the Jordan before settling their own land. This is a key lesson in leadership. Without unity there will be no victory. Spend the time necessary as a leader to gain unity in your team.



Leadership Lesson #3 - Do not elevate yourself. Let God raise you up.
Joshua 4:14 - That day the Lord exalted Joshua in the sight of all Israel; and they revered him all the days of his life, just as they had revered Moses.

The leader that elevates himself will soon fall. Only the leader that God raises up will remain. Do not get caught up in title seeking or self-promotion. This will only delay your effectiveness as a leader. 1 Peter 5:6 - Humble yourselves, therefore, under God’s mighty hand, that he may lift you up in due time.

Leadership Lesson #4 - Real authority in leadership only comes in submission to God.
Joshua 5:13-15 - Now when Joshua was near Jericho, he looked up and saw a man standing in front of him with a drawn sword in his hand. Joshua went up to him and asked, “Are you for us or for our enemies?”
“Neither,” he replied, “but as commander of the army of the Lord I have now come.” Then Joshua fell facedown to the ground in reverence, and asked him, “What message does my Lord have for his servant?”
The commander of the Lord’s army replied, “Take off your sandals, for the place where you are standing is holy.” And Joshua did so.



Leadership Lesson #4 - Real authority in leadership only comes in submission to God.
Joshua 5:13-15 - Now when Joshua was near Jericho, he looked up and saw a man standing in front of him with a drawn sword in his hand. Joshua went up to him and asked, “Are you for us or for our enemies?”
“Neither,” he replied, “but as commander of the army of the Lord I have now come.” Then Joshua fell facedown to the ground in reverence, and asked him, “What message does my Lord have for his servant?”
The commander of the Lord’s army replied, “Take off your sandals, for the place where you are standing is holy.” And Joshua did so.

The question should not be, "Is God for or against me?" The question should be, "Am I on God's side?"

God was confirming to Joshua who was in the lead for the way forward. It was most important for Joshua to understand that God is allied with himself and his purposes. The taking of the Promised Land was God's battle. Joshua had a choice to fall behind his leader.


Leadership Lesson #5 - Purity comes before victory.
Joshua 7:10-12 - The Lord said to Joshua, “Stand up! What are you doing down on your face? Israel has sinned; they have violated my covenant, which I commanded them to keep. They have taken some of the devoted things; they have stolen, they have lied, they have put them with their own possessions. That is why the Israelites cannot stand against their enemies; they turn their backs and run because they have been made liable to destruction.

A good leader will have the purity of his team on his heart and mind continually. He will lead the team in prayer often, asking the Holy Spirit to check their hearts. A good leader will ask specific questions of holiness during one-on-one discipleship times. Hidden sin will always lead to defeat. Pray and work for the exposure of sin.

Leadership Lesson #6 - Assumption leads to disaster.
Joshua 7:3-4 - When they returned to Joshua, they said, “Not all the people will have to go up against Ai. Send two or three thousand men to take it and do not weary all the people, for only a few men are there.” So about three thousand men went up; but they were routed by the men of Ai.
Joshua 8:1
(8a)
The prayer of the righteous is very powerful in its working (or, operation).” James has just exhorted us to “pray for one another, so that you may be healed.” This may refer to healing from illness, especially illness that may be the result of unconfessed sin. Or, it may refer also to spiritual healing, since James has instructed us to confess our sins to one another. But his point is that whether your need is physical or spiritual, prayer is very powerful. But, he qualifies it. In other words if we have been justified by faith, we stand before God with a righteousness that is not our own. If you think that you can approach God through your righteousness, you do not understand the gospel. The gospel shuts us all up under sin, showing that our own righteousness will never satisfy God’s holy.

(8b)
(ii)It’s built into our very existence. Because we are created in His image, God’ image, we are to mimic Christ-like behavior.

(ii)Prayer is an avenue to resolution, the path to finding an answer to a problem. It provides insight to our dilemmas and tough decisions

Offline ellah

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Re: C R S
« Reply #16 on: September 02, 2020, 11:19:02 am »
IRS-ANSWERS


(1)
(a) Sleeping and Waking up Early
(b) Use of Miswak
(c) Having always a pleasant smile
(d) Doing Hijama (Cupping)
(e) Sit while eating or drinking
(f) Always speaks good or keep silent
=====================================


(2a)
Bismillah Ar-Rahman Ar-Raheem
Qul a'udhu bi Rabbi-n-nas
Maliki-n-nas
Ilahi-n-nas
Min-sharri-l-waswasi-l-khannas
Alladhi yuwaswisu fi suduri-n-nas
Min al-jinnati wa-n-nas

(2bi)
The importance of this Surah teaches us to always seek refuge in Allah the Lord of all mankind away from their evil

(2bii)
Also devil (Shaitan) has his power everywhere on earth and this Surah is also a key part in seeking refuge and away from Shaitan and other Jinn

=====================================

(3a)
Prophet Muhammad (S, A, W) was monogamous for 25 years when married to his first wife, Khadija bint Khuwaylid . After her death in 619 CE, he
over time married a number of women. Which are Sawdah, `A'ishah, Umm-Salamah, Hafsah, Zaynab bind-Khuzaymah, Zaynab bint-Jahsh, Umm-
Habibah (Ramla), Maymunah, Zaynab bint-`Umais, Juwayriyah, Safiyah, Khawlah bint-Hakim
Of his 13 wives, only two bore him children : Khadija and Maria al-Qibtiyya . The objectives of Muhammad's marriages have been described
as:
1. Helping out the widows of his companions.
2. Creating family bonds between him and his companions
(Muhammad married the daughters of Abu Bakr and Umar, whereas Uthman and Ali married his daughters. He therefore had family bonds with all the first four Caliphs).
3. Spreading the message by uniting different clans through marriage.
4. Increasing credibility and sources for conveying his private family life. If he only had one wife, then it would have been a tremendous responsibility on her to convey Muhammad's private acts of worship and family life, and people would try to discredit her to destroy the credibility of these practices.
=====================================



(4a)
1. Sahih al-Bukhari
2. Sahih Muslim
3. Sunan Abu Dawood
4. Sunan al-Tirmidhi
5. Sunan al-Nasa'i
6. Sunan ibn Majah

(4b)
Ṣaḥīḥ al-Bukhārī ( Arabic : ﺻﺤﻴﺢ ﺍﻟﺒﺨﺎﺭﻱ ) is one of the Kutub al-
Sittah (six major hadith collections) of Sunni Islam , compiled by
Persian scholar Muhammad al-Bukhari . It was completed around
846 CE / 232 AH.
=====================================

(5a)
Tayammum is the Islamic act of dry Ritual purification using a purified sand or dust, which may be performed in place of ritual washing (wudu or ghusl) if no clean water is readily available or if one is suffering from moisture-induced skin inflammation or scaling.

(5b)
1. Finding a piece of ground which is free of najaasah (unclean elements). This could be any surface that naturally collects dust like rock or sand.[contradictory]
2. Mentally make niyyah, or intention to make tayammum.
3. Recite the bismillah.
4. Place the hands on the surface of the ground.
5. Lift your hands and ensure that there is no dust on your palm surface by hitting your hands together.
6. Rub your face with both your hands. The face encompasses the right ear to the left, and the top of the forehead to the bottom of the chin
7. Rub your hands with one another
====================================

(6a)
Shari'ah is an Islamic religious law that governs not only religious rituals but also aspects of day-to-day life in Islam.

(6b)
(i)Qur'an
(ii)Consensus
(iii)Sunnah
(iv)Legal reasoning

(6c)
(i)Quran is the word of Allah that was revealed in Arabic to prophet Muhammad who is the last prophet as stated clearly in the Qur'an.
(ii)The sunnah refers to the habits, practices, words, and
decisions of the Prophet Muhammad in Sunni Islam, and of
the Prophet

Offline Richkid500

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Re: C R S
« Reply #17 on: September 02, 2020, 01:50:17 pm »
Chemistry answer pls

Offline Sidikie Mansaray

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Re: C R S
« Reply #18 on: September 02, 2020, 02:13:08 pm »
Please help with Chemistry answers

Offline chibuikem

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Re: C R S
« Reply #19 on: September 02, 2020, 02:15:53 pm »
Pls Chemistry Answers pls...
ECN.

Offline okpei

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Re: C R S
« Reply #20 on: September 02, 2020, 02:17:00 pm »
CHEMISTRY ESSAY ANSWERS:
(1ai)
Faraday's first law of electrolysis states that the mass(m) of an element discharged during electrolysis is directly proportional to the quantity of electricity(Q) passing through it.

(1aii)
(i) Strong electrolytes conduct large currents while Weak electrolytes do not conduct current readily.
(ii) Strong electrolytes ionize completely while weak electrolytes ionize only slightly

Offline okpei

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Re: C R S
« Reply #21 on: September 02, 2020, 02:18:01 pm »
(1b)
Ethyne burns in air to give a smoky and luminous flame (complete combustion)

(1ci)
If an organic compound contains carbon atoms joined by double or triple covalent bonds. The compound is said to be an unsaturated hydrocarbon.

1cii)
CH3COOH(aq) + CH3OH(aq) <--> CH3COOCH3(l) + H2O(l)

(1ciii)
Methyl ethanoate

Offline okpei

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Re: C R S
« Reply #22 on: September 02, 2020, 02:18:43 pm »
(1d)
By removing the main product continuously

(1e)
Number of moles of Zn dust = Mass/molars mass = 3.75/65 =0.0077
Reacting mole ratio of Zn to H2 is 1:1
:’ No of moles of H2 produced =0.0677 moles
1 mole = 6.02x10²³ molecules
0.0577moles of hydrogen produces
=6.02x10²³ x0.0577
=0.347x10²³ molecules
Or 3.47x10²² molecules

Offline NORTOLA

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Re: C R S
« Reply #23 on: September 02, 2020, 02:24:48 pm »
WAEC Chemistry Answers 2020:
PAPER 2 [Essay]
Answer any FOUR questions.
Write your answers on the answer booklet provided.

1. (a) (i) What is the structure of the atom as proposed by Rutherford?
(ii) Distinguish between the atomic number and the mass number of an element.
(iii) Explain briefly why the relative atomic mass of chlorine is not a whole number.

(b) (i) What is meant by first ionization energy?
(ii) List three properties of electrovalent compounds
(iii) Consider the following pairs of elements:
9F and 17CL;
12Mg and 20Ca.
Explain briefly why the elements in each pair have similar chemical properties.

(c) Explain briefly the following terms using an appropriate example in each case
(i) homologous series;
(ii) heterolytic fission.

(d) State the indicator(s) which could be used to determine the end-point of the following titrations:
(i) dilute hydrochloric acid against sodium hydroxide solution;
(ii) dilute hydrochloric acid against ammonium hydroxide solution;
(iii) ethanoic acid against sodium hydroxide solution.

(e) A solid chloride E which sublimed on heating reacted with an alkali F to give a choking gas G. G turned moist red litmus paper blue.  Identify E,F and G.

ANS: (a) (i) The atom has small/ tiny positively charged centre /nucleus with electrons surrounding the space around  the centre. 
(ii) Atomic number of an element is the number of protons/electrons in an atom of the element while mass number is the sum of the protons and neutrons in the atom of the element.
(iii) Chlorine atom is made up of a mixture of isotopes and the relative atomic mass of chlorine is the average of its isotopic masses.

(b) (i) Is the (minimum) energy required to remove one mole of an electron from one mole of gaseous atom (to form one mole gaseous charged ion
(ii) High melting /boiling point;
Ability to conduct electricity in the molten state or in solution;
Solid at room temperature;
Soluble in water or polar solvents /insoluble in non-polar solvents.
(iii) Atoms of the elements in each pair have the same number of electrons in their outer-most shell therefore similar chemical properties.

(c) (i) Is a family of organic compounds:
– where successive members differ by –CH2 of  molar mass of 14;
– with similar chemical properties;
– which conform to the same general formula;
– which show gradation of physical properties;
– which have the same general method of preparation. e.g  alkanes, alkenes , alkanols.
(ii) Is a process in which a (covalent) bond is broken in such a way that the electron pair is completely transferred to one of the atoms (resulting in the formation of ions)
H ÷ CI     →      H+ + Cl-/ HCl ® H+ + Cl-
(d)(i) Methyl orange/ methyl red/ phenolphthalein;
(ii) Methyl orange/ methyl red;
(iii) Phenolphthalein.
(e) E   –   NH4Cl
F  –  NaOH, KOH, or Ca (OH)2,  Li OH, CsOH, Ba(oH)2, Mg(OH)2
G  –   NH3.

2. (a) (i) Define saturated solution.
(ii) The solubility of KN03 at 20°C was 3.00 mol dm-3 If 67.0g of KN03 was added to 250cm3 of water and stirred at 20°C, determine whether the solution formed was saturated or not at that temperature.

(b) (i) Distinguish between dative bond and covalent bond.
(ii) Explain why sugar and common salt do not conduct electricity in the solid state.
(iii) State the type of intermolecular forces present in
I. hydrogen fluoride;
II. argon.
(iv) Consider the compounds with the following structures:
S – H —-N and 0 – H —–N
In which of the compounds is the hydrogen bond stronger? Give reason for your answer.

(c) (i) State Dalton’s Law of Partial Pressure.
(ii) If 200cm3 of carbon(IV) oxide were collected over water at 18°C and 700 mmHg, determine the volume of the dry gas at s.t.p.[ standard vapour pressure of water at 18°C = 15 mmHg]

ANS: (a) (i) Is a solution which contains the maximum amount of solute it can dissolve at a given temperature (in the presence of undissolved solute).
(ii) Solubility of KN03 in in g dm-3 = 3.00 x 101 = 303
.. 1000cm3 of saturated solution = 303g
250cm3 of the solution = 303 x 250
                                                1000 
                                           = 75.8 g
Since the quantity of KN03 added (67.0) to 250 cnr’ of water is less than maximum amount required to form a saturated solution, then the solution is unsaturated.

(b)(i) In dative bond, only one of the participating atoms/ species donated electrons to be shared by both atoms while in covalent bond both participating atoms/ species contribute equally the electrons being shared.
(ii) Sugar is covalent while common salt (NaCl) is electrovalent/ ionic. Electrical conductivity (in compounds) depends on presence of mobile ions.
(iii) The intermolecular forces present in hydrogen fluoride and argon were hydrogen bond and van der Waal’s forces respectively.
(iv) 0 – H —- N has the stronger hydrogen bond because oxygen is more electronegative and smaller in size than sulphur.

(c)(i) the total pressure exerted by a mixture of gases which do not react chemically is equal to the sum of the individual partial pressures of the gases in the mixture.
(ii) pressure of the dry gas (P 1) = 700 – 15 = 685 mmHg
VI = 200cm3, TI = 18°C = 273 + 18 = 291K, P2 = 760 mmHg,
T2 = 273
P1V1 = P2V2
  T1         T2
V2 = P1V1T2   =       
          P2T1

= 685 x 200 x 273
   760 x 291

= 169.1cm3

3. (a) (i) Define nuclear fission
(ii) A certain natural decay series starts with and ends with. Each step involves the loss of an alpha or a beta particle. Using the given information,  deduce how many alpha and beta particles were emitted.
(b) Consider the equilibrium reaction represented by the following equation: A2(g)  +  3B2(g)    2AB3(g);    H   =  +  kJmol-1
Explain briefly the effect of each of the following changes on the equilibrium composition;
(i)  increase in concentration of B;
(ii) decrease in pressure of the system;
(iii) addition of catalyst.
(c) The lattice energies of three sodium halides are as follows:

Compound

NaF

NaBr

NaI

 Lattice energy/kJmol-1

890

719

670

Explain briefly the trend.

(d) State the property exhibited by nitrogen (IV) oxide in each of the following reactions:
(i) 4Cu  +  2NO2        4CuO + N2;
(ii) H2O+ 2NO2        HNO3   + HNO2

(e) Iron is manufactured in a blast furnace using iron ore (Fe2O3), coke and limestone.
Write the equation for the reaction(s) at the:
(i) top of the furnace;
(ii) middle of the furnace;
(iii) bottom of the furnace.
(f) (i) Name two products of destructive distillation of coal.
(ii) Give one use of each product in 3(f)(i).

4. Copy and complete the following table:

Oxide of nitrogen   Oxidation state of nitrogen   Colour of gas   Solubility in water   Action on damp blue litmus paper
N2O   + 1       Insoluble   
NO       Colourless       
NO2               
(i) Mention one compound that makes water
I. temporarily hard;
II. permanently hard.
(ii) State one method that could be used to remove
I. only temporary hardness;
II. permanent hardness.
(iii) Write an equation to show the removal of:
I. temporary hardness;
II. permanent hardness.
(c) (i) List three sources of water pollution.
(ii) Mention two ways by which water pollution can be controlled.
(d) state the function of each of the following substances in the purification of water for town supply:
I. sodium aluminate (III) (NaAIO2);
II. lime (calcium hydroxide);
III. calculated mount of iodine;
IV. sand bed.

6. (a) (i) What is meant by atomicity?
(ii) Mention one element in each case which is
I. monatomic,
II. diatomic,
III. tetratomic.
(iii) Write the orbital electron configuration of
I. 20Ca,
II. 9F.
a. In which group does each of the elements belong?
b. How many unpaired electrons are present in 9F?
c. How many electrons are present in 20Ca2+?

(b) (i) Write a balanced equation for the thermal decomposition of KCƖO3.
(ii) Mention the catalyst that could be used to increase the rate of reaction in 6(b)(i).
(ii) If 5.0 g of KCƖO3 was decomposed by heat, determine the volume of oxygen produced at s.t.p.
[Molar gas volume at s.t.p. = 22.4dm3, K = 39,  Cl = 35.5, O = 16]

(c) (i) Mention the products formed when each of the following substances is heated strongly:
I. ZnCO3;
II. CuSO4.5H2O.
(ii) State the colour change observed when each of the residues in 1(d)(i) above is allowed to cool.

7. (a) Describe briefly how each of the following aqueous solutions could be identified in the laboratory:
(i) Ammonium trioxocarbonate (IV);
(ii)Ammonium chloride.
(b) Arrange the following compounds in order of increasing boiling point and give reasons for your answer: CS2,  NaF and CO2.
(c) List two gases each that are:
(i) acidic;
(ii) highly soluble in water;
(iii) oxidized by acidified KMnO4(aq).
(d) In a tabular form, compare the elements silicon and sulphur under the following properties:
(i) metallic character;
(ii) physical state;
(iii) conduction of electricity.
(e) A cuboid piece of sodium metal measures 3 cm x 4 cm x 10 cm. If the density of sodium is 0.971 g cm-3, calculate the number of atoms in the sodium metal.
[ Na = 23; Avogadro constant = 6.02 x 1023 mol_1 ]

waec chemistry answer

8. (a)  (i) Define standard electrode potential.
(ii) State two factors that affect the value of standard electrode potential.
(iii) Give two uses of the values of standard electrode potential.
(iv) Draw and label a diagram for an electrochemical cell made up of
               Cu2+/Cu;   = + 0.34
               Zn2+/Zn;   = – 0.76
(v) Calculate the e.m.f of the cell in 8(a)(iv) above
(b) (i)  In terms of electron transfer, define
I. oxidation;
II. oxidizing agent.
(ii) Balance the following redox reaction: MnO4-    +  I- H+   I2Mn2+

(c) Classify each of the following oxides as basic, amphoteric, acidic or neutral:
(i) Carbon (II) oxide;
(ii) Sulphur(IV) oxide;
(iii) Aluminium oxide;
(iv) Lithium oxide.

(d) What is hydrogen bonding?

Offline NORTOLA

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Re: C R S
« Reply #24 on: September 02, 2020, 02:36:50 pm »
WAEC Chem Objective Questions 2020:

PAPER 1 [Essay]
Answer All questions in this section.
Write your answers on the answer sheet provided.

1. Two immiscible liquids with different boiling points can be separated by _____
A. The use of separating funnel
B. Evaporation
C. Distillation
D. Decantation.

2. A mixture of CaCl2 and CaCO3 in water can be separated by  ______
A. Evaporation
B. Sublimation
C. Distillation
D. Decantation.

3. What is responsible for metallic bonding?
A. sharing of electrons between the metal atoms
B. attraction between the atomic nuclei and the cloud of electrons
C. Transfer of electrons from one atom to another
D. attraction between positive and negative ions.

4. 25cm3 of 1.5M solution of NaCl are added to 50cm3 of 3M NaCl. The molar concentration of the resulting solution is ________
A. 2.5M       B. 3M             C. 2.25M     D. 4.5M

5. A solution of salt formed from HCl and NH3 solutions is _____
A. Acidic     B. Basic          C. complex          D. Neutral

6. Which of the following elements will burn in excess oxygen to form a product that is neutral to litmus?                                                                              A. carbon          B. Hydrogen          C. Sulphur        D. Sodium

7. A current was passed for 10 mins and 0.2mole of Cu was deposited. How many grammes of Ag will it deposit?
(Cu = 64, Ag = 108)
A. 43.2g       B. 21.6g         C. 10.8g    D. 5.4g

8. Pollution of underground water by metal ions is very likely in a soil that has high  ________
A. Acidity       B. Alkalinity        C. Chloride content     D. Nitrate content

9. Producer gas is a gas with low caloric value because it contains more ____
A. CO2 than O2      B. N2 than CO     C. CO2 than N2     D. N2 than CO2

10. Silver chloride turns grey when exposed to sunlight because _____
A. The silver ion is reduced to silver
B. The silver ion is oxidized to silver
C. Silver is a transition metal
D. The silver chloride forms complexes in the sun.

11. Which of these compounds exhibits resonance?
A. Benzene   B. Ethanol    C. Propene    D. Butyne

15. Hydrolysis of CH3COOCH2CH3 in dilute HCl produces ______
A. CH3COOH + CH3CH3
B. CH3CH2OH + CH3COCl
C. CH3COOH + CH3CH2OH
D. CH3COOH + CH3CH3

16. Calculate the volume of CO2 measured at s.t.p produced on heating 250g of potassium hydrogen trioxocarbonate (IV) strongly.
 (K = 39, H = 1, C = 12, O = 16)
 A. 28dm3   B. 2.8dm3  C.5.6dm3  D. 11.2dm3

17. The boiling points of water, ethanol, methylbenzene and butan-2-ol are 373.0K, 351.3K, 383.6K and 372.5K respectively. Which liquid has the highest vapour pressure at 323.0K?
A. Water      B. Methylbenzene       C. Ethanol       D. Butan-2-ol

18. The conclusion from Rutherford’s alpha scattering experiment is that ______
A. Atoms are mostly empty space with a small nucleus
B. Emissions from radioactive substances consist of three main components
C. There is a nuclear pull on orbital electrons
D. Electrons are deflected by both magnetic and electric fields.

19. Elements P, Q and R have atomic numbers 9, 16 and 20 respectively. Which of them would gain electron(s) during ionic bonding                              A. Q and R
B. P and R
C. P and Q
D. P, Q and R.

20. Which of the following has the lowest PH?
A. 5cm3 of M/10 HCl
B. 10cm3 of M/10 HCl
C. 20cm3 of M/8 HCl
D. 15cm3 of M/2 HCl

21. Which of the following is an acid salt?
A. (NH4)2CO3     B. CHCOONa   C. KHSO4     D. MgSO4.7H2O

22. Cr2O2-7 + 14H+  + 6I → 2Cr3+  + 3I2  + 7H2O. The change in the oxidation number of oxygen in the equation above is _______
A. 0       B. 1          C. 2         D. 7

23. During electrolysis of CuSO4 solution using platinum electrodes, which of the following occurs ______
A. Acidity increases at the cathode
B. Oxygen is liberated at the cathode
C. PH decreases at the cathode
D. PH of solution increases.

24. Which of the following ions is a pollutant in drinking water even in trace quantities?
A. Ca2+    B. Pb2+    C. Mg2+     D. Fe2+

25. The solubility of a salt of molar mass 100g at 20oC is 0.34mol/dm3. If 3.4g of that salt dissolved completely 250cm3 of water at that temperature, the resulting solution is ________
A. A suspension
B. Saturated
C. Unsaturated
D. Supersaturated

26. Catalyst is important in in chemical industry in that ______
A. it affects the purity of the products
B. it affects the quantity of the products
C. it increases the time for reaching equilibrium
D. Bond breaking is slowed down.

27. An alkanioc acid has a molecular mass of 88. Name the acid.
(C = 12, O =16, H = 1)
A. Propanioc acid
B. Botanioc acid
C. Pentanioc acid
D. But-2-ionic acid

28. Ethyne undergoes the following reactions EXCEPT
A. Polymerization   B. Addition  C. Combustion    D. Etherification

29.

 

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