Question

What is a chemical change? Justify that explosion of firework (such as crackers) is
a chemical change with the help of any two observations.​

Answer 1

Answer:

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Explanation:

Explosion of a cracker is a chemical change because the explosive reactants are transformed into gaseous products along with heat, light and sound which cannot be reversed. Hence, it is a chemical change.

Answer 2

Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.

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