Elements, Compounds and Mixtures

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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. It consists of only one type of atom.

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What is a compound?

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A compound is a substance formed when two or more different elements are chemically bonded together. For example, water (H2O) is a compound made of hydrogen and oxygen.

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What is a mixture?

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A mixture is a combination of two or more substances that are not chemically bonded. Each substance retains its own properties.

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What is the difference between an element and a compound?

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An element consists of only one type of atom, while a compound consists of two or more different types of atoms chemically bonded together.

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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, such as saltwater.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture that does not have a uniform composition, such as a salad or a mixture of sand and iron filings.

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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. It consists of protons, neutrons, and 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. Molecules can be made of the same or different elements.

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What is a colloid?

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A colloid is a mixture where tiny particles of one substance are dispersed throughout another substance but do not settle out, such as milk.

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What is a solution?

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A solution is a homogeneous mixture where one substance (the solute) is dissolved in another (the solvent), like sugar in water.