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, state, 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 includes processes like burning, rusting, and digestion.

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What is an example of a physical change?

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Curling your hair is an example of a physical change because it alters the shape of the hair without changing its chemical structure.

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What is an example of a chemical change?

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Fizzing and foaming when vinegar is mixed with baking soda is an example of a chemical change, as it produces new substances.

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What are signs of a chemical change?

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

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What happens to the molecules during a physical change?

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During a physical change, the molecules may change their arrangement or state (solid, liquid, gas) but remain the same substance.

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What happens to the molecules during a chemical change?

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During a chemical change, the bonds between atoms are broken and new bonds are formed, resulting in the creation of new substances.

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Is melting butter a physical or chemical change?

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

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What is an example of a sign that a chemical reaction has occurred?

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The formation of a gas, such as bubbles during a reaction, is a sign that a chemical reaction has occurred.

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