How will you know whether a chemical reaction has taken place?
When a chemical reaction occurs, one or more of the following changes take place :
(i) Change in state (ii) Change in colour (iii) Evolution of a gas (iv) Change in temperature.
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What is a chemical equation? Illustrate with an example.
How would you justify that a chemical reaction has taken place in the following cases: (i) Burning of magnesium ribbon in air. (ii) Addition of lead nitrate solution to potassium iodide solution. (iii) Addition of dilute hydrochloric acid to zinc granules.
How do you show that respiration is a chemical change?
Why is it necessary to obtain a balanced chemical equation?
