EXCERCIS
(a) What is a chemical reaction ?
(b) State the conditions necessary for a chemical
change or reaction.
2. Define the following terms
(a) Chemical change (b) Chemical bond
(c) Effervescence (d) Precipitate
3. Give an example of a reaction where the following are
involved
(a) Heat
(b) Light (c) Electricity
(d) Close contact (e) Solution (f) Pressure
(g) Catalyst
Answers
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Answer: chemical reactions are the processes in which new substances with new properties are formed.
B)a)change in colour.
b)change of state.
c) evolution of gas.
d) evolution or absorption of heat.
C)a)2Pb(No3)2=2pbo+4No2+O2.
b)2agcl=2ag+cl2.
c)2h2o=2h2+O2.
Explanation:
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