Describing Chemical Reactions

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What is a chemical change?

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A chemical change is a process where one or more substances are transformed into new substances with different properties.

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What is evidence of a chemical reaction?

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Evidence of a chemical reaction can include the formation of gas, a change in color, the formation of a precipitate, or a change in temperature.

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Why is burning a campfire considered a chemical change?

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Burning a campfire is a chemical change because it creates new substances (like ash and gases) with different properties.

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What are products in a chemical reaction?

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Products are the substances that are formed as a result of a chemical reaction.

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

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

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What happens to molecules during a physical change?

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During a physical change, the molecules of a substance may change their state or appearance, but their chemical structure remains the same.

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What is an example of a physical change?

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

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What is an example of a chemical change?

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An example of a chemical change is rust forming on iron.

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What does the formation of gas indicate in a chemical reaction?

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The formation of gas indicates that a chemical reaction has occurred, often showing that new substances are being produced.

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What is a precipitate?

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A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.