Chemical and Physical Changes

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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 includes processes like rusting, burning, and digestion.

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What happens to ice when it melts?

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When ice melts, it undergoes a physical change from solid to liquid without changing its chemical structure.

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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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How do you calculate density?

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Density is calculated by dividing the mass of an object by its volume. The formula is Density = Mass/Volume.

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What is an example of a physical change?

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An example of a physical change is cutting paper or melting ice.

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What is an example of a chemical change?

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An example of a chemical change is digesting food, where food is broken down into new substances.

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What happens when milk and vinegar are mixed?

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When milk and vinegar are mixed, a chemical change occurs, resulting in the formation of a precipitate.

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

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

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What is an example of a chemical change in everyday life?

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An example of a chemical change in everyday life is baking a cake, where ingredients react to form a new product.