2.6 - Elements, Compounds and Mixtures

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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 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, such as oxygen (O) or gold (Au).

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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. The individual substances retain their own properties. Examples include air and salad.

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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. The different components are not easily distinguishable, such as saltwater.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture where the components are not uniform and can be easily distinguished, such as a salad or a mixture of sand and iron filings.

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What is the difference between a compound and a mixture?

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A compound is a substance formed from two or more elements that are chemically bonded, while a mixture is a combination of substances that are not chemically bonded.

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What is the chemical formula for sugar?

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The chemical formula for sugar is C12H22O11.

Front

What is the term for a substance made of only one kind of atom?

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Element.

Front

Which of the following is not a compound: HCl, Cl, NaCl, CO2?

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Cl is not a compound; it is an element.

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What is the term for a substance that can be separated into simpler substances by chemical means?

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Compound.