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 are some signs of a chemical reaction?

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Signs of a chemical reaction include change in color, production of gas bubbles, formation of a precipitate, and temperature change.

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Can chemical changes be reversed?

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Most chemical changes cannot be reversed.

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What happens during rusting of iron?

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Rusting of iron is a chemical change where iron reacts with oxygen and moisture to form iron oxide.

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

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A physical change alters the form or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances.

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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 burning wood.

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What does it mean when a substance undergoes a temperature change?

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A temperature change often indicates a chemical change, as energy is either absorbed or released during the reaction.

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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.

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What is an endothermic reaction?

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An endothermic reaction is a chemical reaction that absorbs heat from its surroundings.