Question

What are the differences between temporary physical changes and permanent chemicals changes

Answer 1

Answer:

A physical change is a temporary and reversible change in which the physical properties of the substance changes without altering the composition of the substance. A chemical change is a permanent, not easily reversible change in which the identity of the substance is altered to produce one or more new substances.

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Answer 2

Answer:

• Chemical change

1. A chemical reaction is a process in which substances undergo bond breaking and are transformed into new substances by formation of new bonds.
2. Chemical changes remain permanent.
3. During chemical change, composition of matter changes.
4. Example: Burning of wood, Rusting of iron, Ripening of fruit.

• Physical change

1. When the physical state of the substance changes but it's chemical composition remain same, then it is said that a physical change has taken.
2. Physical change is often temporary in nature.
3. During physical change, new substances are not formed.
4. Example: Condensation of steam, Evaporation of water, melting of ice, melting of wax.