Chemical Reactions

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What is a chemical change?

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A chemical change is a process where substances combine or break apart to form new substances, often accompanied by energy changes. Example: Rusting of a bicycle.

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What indicates that a chemical reaction has occurred?

Back

The formation of a gas is a strong indicator that a chemical reaction has taken place.

Front

What tells us the number of atoms of each element in a compound?

Back

A chemical formula indicates the number of atoms of each element in a compound.

Front

What are the starting materials in a chemical reaction called?

Back

The starting materials in a chemical reaction are called reactants.

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What are the products of 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 law of conservation of mass?

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The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; it is conserved.

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What is an example of a physical change?

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

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What is a reactant in a chemical equation?

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A reactant is a substance that undergoes change during a chemical reaction.

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What is a product in a chemical equation?

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A product is a substance that is produced as a result of a chemical reaction.

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What is a coefficient in a chemical equation?

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A coefficient is a number placed in front of a chemical formula to indicate how many molecules or atoms are involved.