Question

1. In chemical changes, no new substances are formed.
2. Swinging of the pendulum of a clock is a periodic change​

Answer 1

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In chemical changes, no new substances are formed.

Ans:- Physical changes are changes in the physical properties of substances. No new substances are formed in these changes. These changes may be reversible. In chemical changes new substances are produced.

Swinging of the pendulum of a clock is a periodic change

Ans:- pendulum is a suspended weight that swings back and forth in a regular periodic motion. The length of the pendulum determines its frequency, while the weight of the bob does not affect the frequency. Pendulums have been used in clocks for hundreds of years, because the motion is so regular.

Answer 2

Explanation:

pendulum is asuspended weight that swing back and forth in regular periodic motion