Chemistry Physical & Chemical Change Exercise 2c
Please Select
1 What is a chemical change? Give two examples of a chemical change?
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2 Why energy is involved in a chemical change?
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3 What do you understand by ‘chemical reaction’?
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4 Give an example of a reaction where the following are involved
(a) Evolution of heat
(b) Absorption of heat
(c) High pressure is required
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5 State the main characteristics of chemical reactions. Give at least one example in each case
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6 Give an example of each of the following chemical changes.
(a) A reaction involving
(i) Change of state
(ii) Formation of a precipitate
(b) An exothermic and an endothermic reaction involving carbon as one of the reactants.
(c) A reaction where the colour change is noticed.
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7 Define exothermic and endothermic changes. Give two examples in each case.
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8 State the effects of endothermic and exothermic reactions on the surroundings.
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9 Define:
(a) Photochemical reaction
(b) Electrochemical reaction
Give one example in each case
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10 Complete and balance the following reactions:
(a) NaCl(aq) + AgNO3(aq) →
(b) Pb(NO3)2 + KI →
(c) CuCO3→▵
(d) Pb(NO3)2 →▵
(e) NH3 + O2 →pt;
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11 What do you observe? When
a) Lead nitrate is heated.
b) Silver chloride is exposed to sunlight.
c) Hydrogen peroxide is exposed to sunlight.
d) H2S gas is passed through copper sulphate solution.
e) Barium chloride is added to sodium sulphate solution
f) Water is added to the quick lime.
g) Sodium chloride solution is added to silver nitrate solution.
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12 Name
(a) a carbonate which does not decompose on heating.
(b) a nitrate which produces oxygen as the only gas.
(c) a compound which produces carbon dioxide on heating
(d) a nitrate which produces brow quesn gas on heating.
Solution :
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