Topic 1: Characteristics of Chemical Reactions

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What is a chemical reaction?

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A chemical reaction is any change that results in the formation of new chemical substances.

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What is evidence of a chemical reaction?

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Evidence of a chemical reaction is anything that shows a new substance has formed.

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How do chemical reactions create new substances?

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Chemical reactions create new substances when atoms break apart and combine back together in new ways.

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What is an example of a chemical change?

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Spoiling food is an example of a chemical change.

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What happens to molecules during a chemical reaction?

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The molecules mix together and create new substances.

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

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A physical change affects the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

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What is an example of a physical change?

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Changing clothes is an example of a physical change.

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What is the role of energy in chemical reactions?

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Energy is often required to break bonds in reactants and form new bonds in products.

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What are reactants in a chemical reaction?

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Reactants are the starting substances that undergo a chemical change.

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What are products in a chemical reaction?

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