Question

EXERCISES
A. Choose the most appropriate answer.
1. Which of these is a chemical change?
a. A substance with different chemical properties is formed.
b. A substance in a different state but similar chemical properties is formed.
c. The molecules of the substances do not undergo any change.
d. A substance with a different shape and size but similar chemical properties is formed.
2. Which of these is an irreversible physical change?
a. rusting of iron
b. freezing of water
c. a double decomposition reaction
d. breaking of a glass tumbler
3. An arrow pointing downwards in a chemical reaction shows
a. evolution of gas.
b. formation of precipitate.
c. oxidation.
d. displacement.
4. A chemical reaction in which heat is given out is called
a. exothermic reaction.
b. endothermic reaction.
c. decomposition reaction.
d. neutralization reaction.

Answer 1

Answer:

1.a.

2.d.

3.b.

4.a.

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