Question

Changes in which only _________ properties of a substance change are called physical changes. Fill in the blank.
Topic: Physical and Chemical Changes

Answer 1

 changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds.[1]

Physical changes occur when objects or substances undergo a change that does not change their chemical composition. This contrasts with the concept of chemical change in which the composition of a substance changes or one or more substances combine or break up to form new substances. In general a physical change is reversible using physical means. For example, salt dissolved in water can be recovered by allowing the water to evaporate.

A physical change involves a change in physical properties. Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density.

An example of a physical change is the process of tempering steel to form a knife blade. A steel blank is repeatedly heated and hammered which changes the hardness of the steel, its flexibility and its ability to maintain a sharp edge.

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Answer 2

Dear Student,

◆ Answer -

Changes in which, only physical properties of a substance change are called physical changes.

● Extra information -

• In physical change, composition of substances remains same after.
• It is reversible change. For example, boiling of water.
• In chemical change, composition of substance changes.
• It is irreversible change. For example, rusting of iron.

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