1. (a) What is a chemical reaction ? (b) State the conditions necessary for a chemical change or reaction to take place. 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 .
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A - new chemical substance with different properties are know as chemical reaction
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