Physical and Chemical Changes 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 original substance. Examples include rusting, burning, and digestion.

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What are some indicators of a chemical change?

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

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What are some examples of physical changes?

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Examples of physical changes include ice melting, water boiling, breaking a glass, and dissolving sugar in water.

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What are some examples of chemical changes?

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Examples of chemical changes include burning wood, baking a cake, rusting iron, and souring milk.

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Can physical changes be reversed?

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Yes, many physical changes can be reversed, such as freezing and melting water.

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Can chemical changes be reversed?

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Most chemical changes are not easily reversible, as they result in new substances being formed.

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What happens to the mass of substances during a chemical change?

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The mass of substances is conserved during a chemical change; it remains the same before and after the reaction, according to the law of conservation of mass.

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What is an example of a physical change in the kitchen?

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An example of a physical change in the kitchen is chopping vegetables.

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What is an example of a chemical change in the kitchen?

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An example of a chemical change in the kitchen is baking bread.