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 state (like melting or freezing) and changes in shape or size.

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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 the rearrangement of atoms. Examples include burning, rusting, and baking.

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What happens during a chemical reaction?

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During a chemical reaction, reactants are transformed into products through the breaking and forming of chemical bonds, resulting in new substances with different properties.

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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 environment, forming iron oxide (rust).

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Is cutting a piece of paper a physical or chemical change?

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Cutting a piece of paper is a physical change because it alters the shape and size of the paper without changing its chemical composition.

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What is an example of a chemical change in cooking?

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Baking a cake is an example of a chemical change because the ingredients undergo a chemical reaction to form a new product.

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What are indicators of a chemical change?

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Indicators of a chemical change include color change, temperature change, gas production (bubbles), and the formation of a precipitate.

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

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A physical change does not alter the chemical composition of a substance, 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, where the state changes but the chemical composition remains H2O.

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What is combustion?

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Combustion is a chemical change that occurs when a substance reacts rapidly with oxygen, producing heat and light, such as burning wood or gasoline.