Physical and Chemical Changes

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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. Examples include changes in shape, size, or state (like melting or freezing).

Front

What is a chemical change?

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A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and changes the substance's chemical properties. Examples include burning, rusting, and mixing acids with bases.

Front

What happens to water when it is heated to form steam?

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When water is heated to form steam, it undergoes a physical change. The water changes from a liquid to a gas (steam) but remains H2O.

Front

What is an example of a chemical change?

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Burning wood is an example of a chemical change because it transforms the wood into ash, smoke, and gases, creating new substances.

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What occurs when baking soda and vinegar are mixed?

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Mixing baking soda and vinegar results in a chemical change, producing carbon dioxide gas, water, and sodium acetate.

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Is melting ice a physical or chemical change?

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Melting ice is a physical change because the ice (solid water) changes to liquid water without changing its chemical composition.

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What is rusting?

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Rusting is a chemical change that occurs when iron reacts with oxygen and moisture in the air, forming iron oxide (rust).

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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 identity, while a chemical change results in the formation of new substances.

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What happens during a chemical reaction?

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During a chemical reaction, reactants are transformed into products, resulting in a change in chemical composition and properties.

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Can a physical change be reversed?

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Many physical changes can be reversed (like freezing and melting), but some may not be easily reversible (like breaking a glass).