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 change?

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Signs of a chemical change include fizzing, foaming, color change, heat production, and formation of gas bubbles.

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Is melting ice a chemical or physical change?

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Melting ice is a physical change because it changes from solid to liquid without altering its chemical composition.

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What happens during a chemical reaction?

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During a chemical reaction, reactants are transformed into products, often involving the breaking and forming of bonds.

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What is rusting?

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Rusting is a chemical change where iron reacts with oxygen and moisture to form iron oxide, commonly known as rust.

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What is an example of a physical change?

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

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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 of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

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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.

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What is an exothermic reaction?

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An exothermic reaction is a chemical reaction that releases heat to its surroundings.

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What does it mean when a gas is produced in a reaction?

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The production of gas during a reaction is a sign that a chemical change has occurred.