Physical and Chemical Changes 7th Grade Final

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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 cutting.

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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 a change in the chemical composition of the substance. Examples include rusting, burning, and baking.

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What happens to the properties of a substance during a chemical change?

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The properties of a substance change during a chemical change, indicating that a new substance has formed.

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What is rusting?

Back

Rusting is a chemical change that occurs when iron reacts with oxygen and moisture in the environment, forming iron oxide (rust).

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Why is cutting paper considered a physical change?

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Cutting paper is a physical change because it does not change the chemical composition of the paper, and the paper can be reassembled into its original form.

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What is an example of energy release in a chemical change?

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Burning wood is an example of a chemical change that releases energy in the form of heat and light.

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What is an example of a physical change?

Back

Melting ice is an example of a physical change, as it changes from solid to liquid without altering its chemical composition.

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What indicates a chemical change?

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A change in color often indicates a chemical change, as it suggests that new substances are being formed.

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What is the difference between physical and chemical changes?

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Physical changes do not alter the chemical composition of a substance, while chemical changes result in the formation of new substances.

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What are some signs of a chemical change?

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