Changes and ECM

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What is a chemical change?

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A chemical change is a process where substances combine or break apart to form new substances with different properties.

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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 homogeneous mixture?

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A homogeneous mixture is a mixture that has a uniform composition throughout, meaning the different components are evenly distributed.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture where the components are not evenly distributed, and different parts can be seen and separated.

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What is a pure substance?

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A pure substance is a material that has a constant composition and consistent properties throughout; it can be an element or a compound.

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What is an element?

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An element is a pure substance that cannot be broken down into simpler substances by chemical means.

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What is a compound?

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A compound is a pure substance formed when two or more elements chemically combine in fixed proportions.

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What is the law of conservation of mass?

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The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; it is conserved.

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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.

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What is an example of a chemical change?

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An example of a chemical change is rust forming on iron.