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 dissolving.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and can be indicated by color change, temperature change, gas production, or precipitate formation.

Front

What happens during cooking an egg?

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Cooking an egg is a chemical change because it transforms the proteins in the egg, resulting in a new substance with different properties.

Front

What is an indicator of a chemical change?

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Indicators of a chemical change include unexpected color changes, temperature changes, gas production (bubbles), and the formation of precipitates.

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What is an example of a new substance forming?

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Lighting a match is an example of a new substance forming, as it produces heat, light, and new chemical compounds.

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What does bubbling indicate when substances are combined?

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Bubbles forming when two or more substances are combined typically indicate a chemical change, as gas is being produced.

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What is NOT an indicator of a chemical change?

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Bubbles and steam rising from boiling salt water is NOT an indicator of a chemical change; it is a physical change.

Front

What is an unexpected color change?

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An unexpected color change is a sign of a chemical change, indicating that a new substance has formed.

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What is temperature change in a chemical reaction?

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Temperature change during a chemical reaction can indicate that energy is being absorbed or released, which is a sign of a chemical change.

Front

What is the difference between a physical and chemical change?

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A physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.