Atoms, Molecules, Compounds, & Mixtures

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What is an atom?

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An atom is the smallest unit of matter that retains the properties of an element. It consists of a nucleus containing protons and neutrons, surrounded by electrons.

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What is a molecule?

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A molecule is a group of two or more atoms bonded together, representing the smallest fundamental unit of a chemical compound.

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What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together in a fixed ratio.

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What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.

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How many atoms are in one molecule of water (H2O)?

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One molecule of water (H2O) contains three atoms: two hydrogen atoms and one oxygen atom.

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What is the difference between an element and a compound?

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An element is a pure substance that cannot be broken down into simpler substances, while a compound is made up of two or more different elements chemically combined.

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What is the chemical formula for hydrogen peroxide?

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The chemical formula for hydrogen peroxide is H2O2.

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What does the subscript in a chemical formula indicate?

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The subscript in a chemical formula indicates the number of atoms of the element present in one molecule of the compound.

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What is the significance of the ratio of elements in a compound?

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The ratio of elements in a compound determines its chemical properties and behavior, as well as its molecular structure.

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NGSS.MS-PS1-1

Front

Can mixtures be separated? If so, how?

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Yes, mixtures can be separated by physical methods such as filtration, distillation, or chromatography.