Earlyface

Chemistry obj 
1-10: ebcbcbacca 
11-20: cbeeccadbb 
21-30: eddbcdecda 
31-40: ebbcbbaaba 
41-50: daaaceabae 
51-60: aeabcaeabc

THEORY
(2a) 
(I)Fermentations is the slow decomposition by micro-organisms of large organic molecules(such as starch) into smaller molecules(such as ethanol) 
(Iv)Allotropy is the ability of carbon to exist in various forms in the same physical state 
(2b) 
(I)It states that the rate of diffusion of a gas:R is inversely proprotional to the square of its density. R=k/sqr rut d 
(Ii) 
Lactic acid-milk, 
Ascorbic acid-orange

(2c) 
(I)Acid is a substance which produces hydrogen ions(or protons) as the only postive ion when dissolve in water. 
(Ii) 
-by dissolvibg acid anhydrides in water 
-by displacing a weaker more volatile acid from its sodium or potassium salt using a stronger but less volatile acid$ 
-by direct combination between the elements

(4)(A) 
(I) 
Le chatelier's principle states that for a reversible reaction in equilibrium. If one of the the factors keeping the systems in equilibrium is altered, the equilibrium will shift to oppose the change. 
(Ii) 
-the concentration of the reaction species in the system. 
-the total pressure of the reacting system for reaction involving gases. 
-temperature of the reacting system 
(Iii) 
-it speed up reaction 
-it does not change in reaction

(4b) 
(I)Cast iron, pig iron,wrought iron 
(Ii) 
Rusting is the reaction of iron and oxygen in the presence of water or air mositure 
(Iii)Painting 
(4c) 
(I) 
It is the ability of a substance to attract and hold water molecules from the surrounding environment. 
(Ii)washing soda


5a)i. ions are atom or a group of atoms which possesses an electric charge
ii.Electrolyte:this is a compand either in solution or molten form which conducts electricity current.
5a)ii.d first law of electrolysis state dat d mass(M) of an element discharged during an electrolysis is directly proportional to d quantity of electricity(Q)passing through d electrolyse

5b.i.standard solution is a solution of knw concentration
5b.ii.compound=A is always homogenous
mixture=it may b homgenous or heterogenous
5b.iii.mixture=blood, saltwater
compound=sugar
5b.iv.law of conservation of mass state dat matter can neither b created nor dertroy during or dinary chemical reaction

No 6ai
An hydrocarbon is an organic compound containing carbon and hydrogen only
ii alkalenes-methane
  alkalenes-ethene
  alkynes-propyne
6b
i copper2tetranitmiii on
ii hexacyanoferrateiii ion
iii heptachchnomatevi
bii
Ca=0.10moldm3
Vb=25cm3
Va=23.5
Cb=?
Equation of reaction
2Hcl+Na2Co3=Nacl+H2O
2:1
CaVa/cacb=nAnb
0.10*23.5*1/25*2=0.047moldm3
Molar conc=molar conc*molar mass
0.047*106
=4.89gldm3

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