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 includes processes like burning, rusting, and digestion.

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What is matter?

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Matter is anything that has mass and takes up space. It can exist in different states, such as solid, liquid, and gas.

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What happens to water in the water cycle?

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In the water cycle, water undergoes physical changes such as evaporation, condensation, and precipitation, but its chemical composition remains the same.

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What is rusting?

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Rusting is a chemical change that occurs when iron reacts with oxygen and moisture in the air, forming iron oxide (rust).

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What is digestion?

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Digestion is a chemical change where food is broken down into smaller molecules by enzymes and acids in the stomach and intestines.

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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. The substance remains H2O, but its state changes from solid to liquid.

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What is an example of a chemical change?

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An example of a chemical change is burning wood. The wood reacts with oxygen to produce ash, smoke, and gases.

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What is the difference between a physical and chemical change?

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A physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.

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What is evaporation?

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Evaporation is the process where liquid water turns into water vapor, a physical change that occurs when heat is applied.