Reviewing Physical and Chemical 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 to a candle when it burns?

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When a candle burns, it undergoes a chemical change as the wax reacts with oxygen to produce heat, light, carbon dioxide, and water.

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What is rusting?

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Rusting is a chemical change that occurs when iron reacts with oxygen and moisture in the air, forming iron oxide (rust).

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What is bleaching?

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Bleaching is a chemical change that removes color from materials, often using substances like chlorine or hydrogen peroxide.

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What is matter?

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Matter is anything that takes up space and has mass.

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How do we sort matter by color?

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We use our sense of sight to sort matter by color.

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What is an example of a physical change?

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An example of a physical change is melting ice into water.

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What is an example of a chemical change?

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An example of a chemical change is baking a cake, where ingredients react to form a new product.

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

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A physical change does not create new substances, while a chemical change results in the formation of new substances.