8.5E - Chemical and Physical Changes

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What is a physical change?

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A physical change is a change in which the form or appearance of a substance changes, but its chemical composition remains the same. Examples include melting, freezing, and breaking.

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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 change in the chemical composition of the substance. Examples include rusting, burning, and digestion.

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What indicates a physical change?

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A physical change can be indicated by changes in state (solid, liquid, gas), shape, or size without altering the chemical composition.

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What indicates a chemical change?

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Indicators of a chemical change include color change, gas production (bubbles), temperature change, and the formation of a precipitate.

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What is an example of a physical change?

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An example of a physical change is an ice cube melting 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 the rusting of iron.

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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 remain the same during a physical change, even though its form may change.

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

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The properties of a substance change during a chemical change because new substances are formed.

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What is a precipitate?

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A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

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What is an example of a temperature change indicating a chemical change?

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An example is when vinegar and baking soda react, producing carbon dioxide gas and causing a temperature change.