Elements, Compounds, Mixtures

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What are elements?

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Elements are pure substances that cannot be broken down into simpler substances by chemical means. They consist of only one type of atom.

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What are compounds?

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Compounds are substances formed when two or more elements chemically bond together in fixed proportions.

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What are mixtures?

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Mixtures are combinations of two or more substances that are not chemically bonded and can be separated by physical means.

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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.

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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 are reactants in a chemical equation?

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Reactants are the starting substances in a chemical reaction that undergo change to form products.

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What are products in a chemical equation?

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Products are the substances formed as a result of a chemical reaction.

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What is the difference between a chemical change and a physical change?

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A chemical change results in the formation of new substances, while a physical change does not alter the chemical composition of a substance.

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What is an atom?

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An atom is the smallest unit of an element that retains the properties of that element.