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.

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What is a chemical change?

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A chemical change is a process where one or more substances are transformed into new substances with different properties.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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What are indicators of a chemical change?

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

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NGSS.MS-PS1-2

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What happens during a chemical change?

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During a chemical change, the bonds between atoms in the reactants break and new bonds form to create products.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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Is melting ice a physical or chemical change?

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

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What is rusting of iron an example of?

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Rusting of iron is an example of a chemical change, as it involves the formation of new substances (iron oxide) from iron and oxygen.

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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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NGSS.MS-PS1-4

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What is an example of a chemical change in cooking?

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An example of a chemical change in cooking is the process of baking bread, where heat causes the dough to rise and change chemically.

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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.

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NGSS.MS-PS1-2

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What role does energy play in chemical changes?

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Energy is often absorbed or released during a chemical change, which can result in temperature changes.

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