Science, asked by Anonymous, 1 month ago

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What is physical change and chemical change?​

Answers

Answered by IIXxMISSCRAZYxXII
2

Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.

Answered by Anonymous
7

\bold{\huge{\fbox{\color{purple}{Physical\: Change}}}}

The change in which no new substance is formed is called a physical change. A change in the physical properties of a substance such as shape, size, colour and state of the matter is a physical change.

\bold\red{Examples:-}

Melting of ice, boiling of water, freezing of water, condensation, crystallisation and heating of metals till they become red hot, etc.

Characteristics of a physical change are as follows:-

Physical changes are generally reversible.

Physical changes are temporary in nature.

No new substances are formed.

Energy, in the form of heat, light and temperature is neither absorbed nor evolved.

During a physical change only the physical properties of the substance changes.

\bold{\huge{\fbox{\color{purple}{Chemical\: Change}}}}

A chemical change occurs when two or more substances undergo a chemical reaction and are converted into one or more new substances with different sets of properties.

\bold\red{Examples:-}

Formation of rust on iron objects which are kept in the open for a long time, digestion of food, burning of magnesium, reaction between vinegar, ribbon and baking soda are some types of chemical changes.

Characteristics of a chemical change are as follows:-

A chemical change is permanent in nature and is irreversible.

A new substance is formed which has different properties.

Heat or light may be emitted or absorbed during a chemical reaction.

A chemical change occurs only under particular conditions.

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