Types of Reactions Review

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. An example is burning wood.

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What is an exothermic reaction?

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

Front

What is a sign of a chemical change?

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Signs of a chemical change include color change, gas production, temperature change, and light emission, such as lights flashing from fireworks.

Front

What is a chemical property?

Back

A chemical property is a characteristic of a substance that describes its ability to undergo a specific chemical change. For example, sodium is explosive in water.

Front

What happens when sodium reacts with water?

Back

When sodium reacts with water, it produces sodium hydroxide and hydrogen gas, and the reaction is highly exothermic.

Front

What is the chemical property of chlorine?

Back

A chemical property of chlorine is that it reacts with sodium to form table salt (sodium chloride).

Front

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

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A physical change alters the form of a substance but not its chemical composition (e.g., melting ice), while a chemical change results in the formation of new substances (e.g., rusting iron).

Front

What is an example of a physical change?

Back

An example of a physical change is melting butter in a pan, where the butter changes state but remains the same substance.

Front

What is the boiling point of chlorine?

Back

The boiling point of chlorine is -34.04 °C.

Front

What is a common indicator of an exothermic reaction?

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A common indicator of an exothermic reaction is an increase in temperature of the surroundings.