Identify Evidence of Chemical Changes

Front

What is a chemical change?

Back

A chemical change is when a substance undergoes a change to form a new substance.

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What are some signs of a chemical reaction?

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Signs of a chemical reaction include color change, odor change, temperature change, and the formation of a new substance.

Front

What happens during a color change in a chemical reaction?

Back

A color change indicates that a new substance may have formed as a result of the reaction.

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What does it mean if a solid forms in a liquid during a reaction?

Back

If a solid forms in a liquid, it indicates that a new substance has been created, often referred to as a precipitate.

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Is rusting an example of a chemical change?

Back

Yes, rusting is a chemical change because it involves the formation of a new substance (rust) from iron.

Front

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

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A physical change does not create a new substance, while a chemical change results in the formation of one or more new substances.

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What is an example of a physical change?

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An example of a physical change is breaking a rock into smaller pieces.

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What does it mean when a substance is dissolved in another substance?

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Dissolving is a physical change where the substance remains the same at the molecular level.

Front

What is an indicator of a temperature change in a chemical reaction?

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A temperature change can indicate that a chemical reaction is occurring, either releasing or absorbing heat.

Front

What is the role of reactants in a chemical reaction?

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Reactants are the starting substances that undergo a chemical change to form products.