Chemical & Physical 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 chemical composition of the substance. Examples include rusting, burning, and cooking.

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What happens to water vapor when it cools down?

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When water vapor cools down, it undergoes a physical change called condensation, turning into liquid water.

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What is an example of a physical change involving temperature?

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An example of a physical change involving temperature is the melting of ice into water when heated.

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What is the difference between a physical property and a chemical property?

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A physical property can be observed without changing the substance's chemical identity (e.g., color, melting point), while a chemical property describes a substance's ability to undergo a chemical change (e.g., reactivity with acid).

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What occurs when salt dissolves in water?

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When salt dissolves in water, it undergoes a physical change, as the salt retains its chemical identity but changes its state from solid to dissolved.

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What is an example of a chemical change in cooking?

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An example of a chemical change in cooking is when an egg is cooked, resulting in a change in its chemical structure and properties.

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What happens when baking soda reacts with vinegar?

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When baking soda reacts with vinegar, it undergoes a chemical change, producing carbon dioxide gas and creating a fizzing reaction.

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What is caramelization?

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Caramelization is a chemical change that occurs when sugar is heated, resulting in a change in color and flavor as it turns into caramel.

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What is an example of a physical change that does not involve a chemical reaction?

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An example of a physical change that does not involve a chemical reaction is the melting of ice into water.