SSA-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 without altering its chemical composition. Examples include melting, freezing, and breaking.

Front

What is a Chemical Change?

Back

A chemical change is a change that results in the formation of new chemical substances. Examples include rusting, burning, and fermentation.

Front

Is breaking glass a physical or chemical change?

Back

Breaking glass is a physical change.

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What happens to water when it freezes?

Back

When water freezes, it undergoes a physical change from liquid to solid (ice).

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What property of candle wax changes when heated?

Back

The state of the candle wax changes from solid to liquid when heated.

Front

What is an example of a chemical change involving yeast?

Back

When yeast is added to sugar and water, it ferments, producing gas and foam, which is a chemical change.

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What is the difference between a physical change and a chemical change?

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A physical change does not change the substance's chemical identity, while a chemical change results in new substances being formed.

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Can a physical change be reversed?

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Yes, many physical changes can be reversed, such as melting ice back into water.

Front

Can a chemical change be reversed?

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Most chemical changes are not easily reversible, as they create new substances.

Front

What is an example of a physical change in everyday life?

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Examples include chopping wood, dissolving sugar in water, or freezing juice.