Signs of chemical reactions

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What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances with different properties.

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What evidence indicates that a chemical reaction has occurred?

Back

The formation of a new substance is a key indicator of a chemical reaction.

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Where are the reactants located in a chemical equation?

Back

The reactants are on the left side of the chemical equation.

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What does the subscript in a chemical formula represent?

Back

The subscript indicates the number of atoms of an element in a molecule.

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What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

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What is a product in a chemical reaction?

Back

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

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What is the law of conservation of mass?

Back

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

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What is an example of a sign of a chemical reaction?

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Color change, gas production, and temperature change are all signs 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 are involved in the reaction.

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What is an example of a chemical reaction?

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Burning wood is an example of a chemical reaction, as it produces ash, smoke, and gases.