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 (solid, liquid, gas), 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 rusting of iron and burning of wood.

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What are the three states of matter?

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The three states of matter are solid, liquid, and gas. Solids have tightly packed particles, liquids have loosely packed particles that can flow, and gases have widely spaced particles that move freely.

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What is evidence of a physical change?

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Evidence of a physical change includes changes in shape, size, or state of matter, such as melting ice or breaking glass.

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What is evidence of a chemical change?

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Evidence of a chemical change includes color change, gas production, temperature change, and the formation of a precipitate.

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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.

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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 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 chemical change?

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An example of a chemical change is the reaction between vinegar and baking soda, which produces carbon dioxide gas.

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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.