Chemical & Physical Changes

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What is a chemical change?

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A chemical change is a process where substances combine or break apart to form new substances with different properties.

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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.

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What happens during a phase change?

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During a phase change, a substance changes from one state of matter to another, such as solid to liquid or liquid to gas, without changing its chemical identity.

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What is an example of a physical change?

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Melting chocolate is an example of a physical change because it changes from solid to liquid but remains chocolate.

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What is an example of a chemical change?

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When vinegar reacts with baking soda, it produces carbon dioxide gas, which is a new substance, demonstrating a chemical change.

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What is the law of conservation of mass?

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The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

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What is a reactant?

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A reactant is a substance that undergoes a chemical change in a reaction.

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What is a product?

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A product is a substance that is formed as a result of a chemical reaction.

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What is an example of a physical property?

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Color, shape, and melting point are examples of physical properties.

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What is an example of a chemical property?

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Flammability is an example of a chemical property, as it describes how a substance reacts with fire.