Review Physical and CHemical Properties and Changes

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What is a physical change?

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A physical change is a change that alters the physical properties (appearance) of a substance without changing its chemical composition.

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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, altering the chemical composition of the original substance.

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Can physical changes be reversed?

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Many physical changes can be reversed, such as melting and freezing, but some may not be easily reversible.

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Can chemical changes be reversed?

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Chemical changes are often not reversible by simple physical means, as they involve the formation of new substances.

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What are examples of physical changes?

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Examples of physical changes include melting ice, shredding paper, and dissolving sugar in water.

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What are examples of chemical changes?

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

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What is the difference between physical and chemical properties?

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Physical properties can be observed without changing the substance's composition, while chemical properties can only be observed during a chemical change.

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What is an example of a physical property?

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An example of a physical property is color, density, or boiling point.

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What is an example of a chemical property?

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An example of a chemical property is flammability or reactivity with acids.

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What happens to the composition of a substance during a physical change?

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The composition of a substance remains the same during a physical change.