Chemical Changes

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What is a chemical change?

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A process where one or more new substances are formed, often accompanied by energy changes.

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What is a physical change?

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A change that affects one or more physical properties of a substance without altering its chemical composition.

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What is an example of a chemical change?

Back

Iron rusting is an example of a chemical change.

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What indicates a chemical change?

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Temperature change can indicate a chemical change.

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What are signs of a chemical reaction?

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Change in color and production of gas bubbles are signs of a chemical reaction.

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Is melting ice a chemical or physical change?

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Melting ice is a physical change.

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What happens during a chemical change?

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New substances are created, and the original substances can no longer be identified.

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What is an endothermic reaction?

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A reaction that absorbs heat from its surroundings.

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What is an exothermic reaction?

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A reaction that releases heat to its surroundings.

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What is the law of conservation of mass?

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In a chemical reaction, mass is neither created nor destroyed; it is conserved.