Question

Write down any two characteristics of a physical change.​

Answer 1

Answer:

Those changes in which no new substances are formed, are called physical changes. The changes in state, size, shape and colour of a substance are physical changes. The properties such as state, size, shape and colour of a substance are called its physical properties.

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Answer 2

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Write down any two characteristics of a physical change.

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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.

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give two characteristics that determines the occurrence of a chemical reaction

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Since we can't see this exchange of atoms , one must look for changes in physical properties to determine if a chemical reaction has occured

(1) colour changes

(2) light emission

(3) temperature change

(4) precipitates

(5) Gas production