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 is evidence of a chemical change?

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Evidence of a chemical change includes unexpected color change, gas production, temperature change, and light production.

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What is NOT evidence of a chemical change?

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Melting and breaking are not evidence of a chemical change.

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Example of a chemical change:

Back

Iron rusting is an example of a chemical change.

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Example of a physical change:

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Cutting an orange into wedges is an example of a physical change.

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What happens during a chemical change?

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During a chemical change, bonds between atoms are broken and new bonds are formed, resulting in new substances.

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What happens during a physical change?

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During a physical change, the form of a substance changes, but its chemical identity remains the same.

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Is burning wood a chemical change or a physical change?

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Burning wood is a chemical change because it produces new substances like ash and smoke.

Front

Is dissolving sugar in water a chemical change or a physical change?

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Dissolving sugar in water is a physical change because the sugar can be recovered by evaporating the water.