Chemical and Physical Changes

Front

What is a chemical change?

Back

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.

Front

Give an example of a chemical change.

Back

An example of a chemical change is the rusting of iron, where iron reacts with oxygen to form iron oxide.

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Give an example of a physical change.

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An example of a physical change is melting ice into water, where the substance remains H2O.

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What happens during a chemical reaction?

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During a chemical reaction, bonds between atoms are broken and new bonds are formed, resulting in the creation of new substances.

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What is the difference between a reactant and a product?

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A reactant is a substance that undergoes a chemical change, while a product is a substance that is formed as a result of that change.

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What is an indicator of a chemical change?

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Indicators of a chemical change include color change, gas production, temperature change, and the formation of a precipitate.

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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; it is conserved.

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What is an example of a physical change in the kitchen?

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An example of a physical change in the kitchen is chopping vegetables, where the substance remains the same.

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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 baking a cake, where ingredients react to form a new product.