Basic Chemistry Concepts

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What is matter?

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Anything that has mass and takes up space (has volume). If you can touch it, see it, or it can fill up a container, it’s matter.

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What is a pure substance?

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A type of matter that has a specific and fixed composition, made of only one kind of material all the way through.

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What is a mixture?

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A combination of two or more substances where each substance keeps its own properties and they aren’t chemically bonded together.

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What is an element?

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A pure substance made up of only one kind of atom, defined by the number of protons in its atoms’ nuclei (atomic number).

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What is an atom?

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The basic building block of matter—everything around you is made of atoms.

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What is a compound?

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A substance made up of two or more different elements that are chemically bonded together.

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What is a homogenous mixture?

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A mixture where the components are evenly distributed, so it looks the same throughout. The different parts are mixed at the molecular level.

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What is a heterogenous mixture?

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A type of mixture where you can see the different parts or substances mixed together, and they aren’t evenly spread out. The components keep their own properties and can often be separated easily.