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. Examples include rusting, burning, and cooking.

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What is the difference between physical and chemical changes?

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Physical changes do not create new substances, while chemical changes do. Physical changes can often be reversed, whereas chemical changes usually cannot.

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What is an example of a reversible physical change?

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Melting ice into water is a reversible physical change because the ice can be frozen back into its original form.

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What is an example of an irreversible chemical change?

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Burning wood is an irreversible chemical change because it creates ash and gases that cannot be turned back into wood.

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What happens during a physical change?

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During a physical change, the form or appearance of a substance changes, but its chemical identity remains the same.

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What happens during a chemical change?

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During a chemical change, the substances involved undergo a transformation that results in the formation of new substances with different properties.

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What is an example of a mixture?

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A mixture is a combination of two or more substances that retain their individual properties. An example is a salad, which contains lettuce, tomatoes, and cucumbers.

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How can mixtures be separated?

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Mixtures can be separated using physical methods such as filtering, evaporating, or using a magnet.

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What is filtration?

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Filtration is a process used to separate solids from liquids or gases using a filter that allows only the liquid or gas to pass through.