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What is a chemical reaction?

Back

A process where substances (reactants) undergo a transformation to form new substances (products) with different properties.

Front

What are some signs that a chemical reaction has occurred?

Back

Color change, odor change, gas production (bubbles), temperature change, and formation of a precipitate.

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What is a molecule?

Back

A molecule is made of two or more atoms bonded together.

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

Back

A physical change does not create new substances (e.g., melting ice), while a chemical change results in new substances (e.g., rusting iron).

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What is a reactant?

Back

A substance that undergoes a chemical change in a reaction.

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What is a product?

Back

A substance that is formed as a result of a chemical reaction.

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What does it mean for a substance to be conserved in a chemical reaction?

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The total mass of reactants equals the total mass of products; matter is neither created nor destroyed.

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What is an example of a chemical reaction?

Back

Combining vinegar and baking soda produces carbon dioxide gas.

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What is an indicator of a chemical reaction?

Back

An indicator can be a color change, gas production, or temperature change.

Front

What is combustion?

Back

A chemical reaction that occurs when a substance reacts with oxygen, producing heat and light.