Chemical Reactions & Processes

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases energy in the form of heat, causing the temperature of the surroundings to increase.

Front

What happens to temperature during an exothermic reaction?

Back

The temperature increases.

Front

What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs energy from its surroundings, resulting in a decrease in temperature.

Front

What happens to temperature during an endothermic reaction?

Back

The temperature decreases.

Front

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 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.

Front

What is a coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a compound or element in a chemical equation to indicate the number of molecules or moles of that substance.

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What is a subscript in a chemical formula?

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A subscript is a number written below and to the right of a chemical symbol that indicates the number of atoms of that element in a molecule.

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

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A chemical change results in the formation of new substances, while a physical change does not change the chemical identity of a substance.

Front

What is an example of an exothermic reaction?

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Combustion of fuels, such as burning wood or gasoline, is an example of an exothermic reaction.