Physical and Chemical 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 changes the identity of the substance. Examples include rusting, burning, and cooking.

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What happens to water when it is heated?

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When water is heated, it can change from a liquid to a gas through the process of evaporation. If heated to its boiling point, it will boil and turn into steam.

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How can you separate a mixture of sand and water?

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You can separate a mixture of sand and water by filtering it. The sand will be caught in the filter, while the water will pass through.

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What is evaporation?

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Evaporation is the process by which liquid water turns into water vapor (gas) when it is heated.

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What is condensation?

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Condensation is the process by which water vapor (gas) cools and turns back into liquid water.

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What is an example of a physical change?

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An example of a physical change is ice 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 baking a cake, where ingredients react to form a new substance.

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What is a mixture?

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A mixture is a combination of two or more substances that are not chemically bonded. Each substance retains its own properties.

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What is a solution?

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A solution is a type of mixture where one substance (solute) is dissolved in another (solvent), such as sugar dissolved in water.