Chemical & Physical Changes CFU

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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 changes in state (like melting or freezing) and changes in shape or size.

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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 the rearrangement of atoms. Examples include rusting, burning, and digestion.

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What happens to water when it freezes?

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When water freezes, it undergoes a physical change from liquid to solid. The chemical composition (H2O) remains the same.

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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. The chemical composition (H2O) remains unchanged.

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What is evaporation?

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Evaporation is the process by which liquid water turns into vapor. It is a physical change as the chemical composition of water remains the same.

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What is an example of a chemical change in the human body?

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Digesting food is an example of a chemical change, as it involves breaking down food into new substances through chemical reactions.

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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 alter the chemical composition of a substance, while a chemical change results in the formation of new substances.

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What is an example of a physical change?

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An example of a physical change is melting ice, where the ice changes from solid to liquid but remains H2O.

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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, which produces ash and gases, changing the original substances into new ones.

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What is the role of energy in physical changes?

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Energy is often absorbed or released during physical changes, such as heat being absorbed when ice melts or released when water freezes.