Chemical Reactions Vocabulary

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What is the Law of Conservation of Mass?

Back

A fundamental principle of science stating that mass cannot be created or destroyed in a closed system through ordinary chemical or physical means.

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What is a reactant?

Back

A substance that takes part in and undergoes change during a chemical reaction.

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What is a product?

Back

A substance produced during a chemical reaction.

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What are properties in chemistry?

Back

Physical and chemical characteristics of matter used to describe or identify a substance.

Front

What is a chemical reaction?

Back

A process in which substances (reactants) undergo a transformation to form new substances (products).

Front

What is an example of a physical change?

Back

Melting ice into water.

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What is an example of a chemical change?

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Burning wood to produce ash and smoke.

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What is a chemical equation?

Back

A symbolic representation of a chemical reaction, showing the reactants and products.

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What does it mean for a reaction to be balanced?

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A balanced reaction has the same number of each type of atom on both sides of the equation.

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What is an endothermic reaction?

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A reaction that absorbs energy from its surroundings, usually in the form of heat.