Wednesday 12.4.2024 Physical and Chemical Changes

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance but does not change its chemical composition. Examples include melting, freezing, and dissolving.

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What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves making or breaking bonds between atoms. Examples include burning, rusting, and cooking.

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Can a physical change be reversed?

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Yes, many physical changes can be reversed. For example, ice melting into water can be frozen back into ice.

Front

Can a chemical change be reversed?

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Most chemical changes cannot be easily reversed. For example, burning wood creates ash and smoke, which cannot be turned back into wood.

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What happens to the substance during a physical change?

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The substance retains its original properties and composition, but its physical form may change.

Front

What happens to the substance during a chemical change?

Back

The substance undergoes a transformation that changes its chemical structure, resulting in new substances.

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Give an example of a physical change.

Back

An example of a physical change is ice melting into water.

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Give an example of a chemical change.

Back

An example of a chemical change is iron rusting.

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What are some indicators of a chemical change?

Back

Indicators of a chemical change include color change, temperature change, gas production, and the formation of a precipitate.

Front

What is the difference between a physical and chemical change?

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A physical change alters the form of a substance without changing its identity, while a chemical change transforms the substance into a different one.