Chemical Changes

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What is a chemical change?

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A chemical change is a process that results in the formation of new chemical substances.

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What is a physical change?

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A physical change is a change that does not alter the chemical composition of a substance.

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What is rusting?

Back

Rusting is a chemical change that occurs when iron reacts with oxygen and moisture, forming iron oxide.

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What are signs of a chemical change?

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Signs of a chemical change include color change, temperature change, formation of a gas, and formation of a precipitate.

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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 new substances.

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What is an example of a chemical change?

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Burning wood is an example of a chemical change, as it produces ash and smoke.

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What is an example of a physical change?

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Melting ice is an example of a physical change, as it changes from solid to liquid without altering its chemical composition.

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What is the difference between a mixture and a new substance?

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A mixture contains two or more substances that are physically combined, while a new substance is formed through a chemical change.

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What is the role of energy in chemical changes?

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Energy is often absorbed or released during a chemical change, affecting the temperature and state of the substances involved.

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What is a precipitate?

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A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.