Kahoot! Unit 5 Physical and Chemical Changes in Matter Review

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What is a physical change?

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A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting, freezing, and dissolving.

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What is a chemical change?

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A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and changes the composition of the substance. Examples include burning, rusting, and cooking.

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What happens to the properties of a substance during a physical change?

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The properties of a substance may change in terms of appearance, state, or size, but the chemical identity remains the same.

Front

What happens to the properties of a substance during a chemical change?

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The properties of a substance change completely, resulting in new substances with different chemical identities.

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What is the effect of temperature on reaction rates?

Back

Generally, increasing the temperature increases the reaction rate because particles move faster and collide more often.

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What should a scientist do if their hypothesis is not supported by the data?

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The scientist should share their results, conduct more research, and ask a new question.

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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 an example of a chemical change?

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An example of a chemical change is burning wood in a campfire.

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What is the role of heat in chemical reactions?

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Heat can provide the energy needed to initiate a chemical reaction and can also affect the rate of the reaction.

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What is the difference between an endothermic and exothermic reaction?

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An endothermic reaction absorbs heat from the surroundings, while an exothermic reaction releases heat.