Physical vs 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 melting, freezing, and dissolving.

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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 changes the composition of the original substance. Examples include burning, rusting, and cooking.

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What happens during a chemical change?

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During a chemical change, the bonds between atoms in a substance break and new bonds form, resulting in the creation of one or more new substances.

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What is an example of a physical change?

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Melting of ice is an example of a physical change, as it changes the state of water from solid to liquid without changing its chemical composition.

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What is an example of a chemical change?

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

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How can you identify a chemical change?

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Signs of a chemical change include color change, temperature change, gas production, and the formation of a precipitate.

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Is boiling water a physical or chemical change?

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Boiling water is a physical change because it changes the state of water from liquid to gas without altering its chemical composition.

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What is rusting of iron?

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Rusting of iron 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 happens when sodium metal is cut with a knife?

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Cutting sodium metal with a knife is a physical change, as it alters the size and shape of the sodium without changing its chemical identity.

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What is the significance of chemical changes in everyday life?

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Chemical changes are significant in everyday life as they are involved in processes like cooking, digestion, and the formation of new materials.