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A substance is a form of matter that has a constant chemical composition and characteristic properties. It cannot be separated into its several components without breaking its chemical bonds.
Water, gold, table salt and sugar are all substances.

en.wikipedia.org/wiki/Chemical_substance

A chemical substance also known as a pure substance is a form of matter that has constant chemical composition and characteristic properties. It cannot be ...

www.thoughtco.com/definition-of-pure-substance-605566

Mar 31, 2017 ... This is the definition of pure substance along with examples of things that are pure substances (and ones that aren't).

www.thoughtco.com/examples-of-pure-substances-608350

Jul 9, 2017 ... A pure substance or chemical substance is homogeneous with constant properties throughout the sample. Here are examples of pure ...

www.icoachmath.com/chemistry/definition-of-pure-substances.html

Definition of Pure Substances. A pure substance or chemical substance is a material that has constant composition (is homogeneous) and has consistent ...

www.dummies.com/education/science/chemistry/how-to-distinguish-pure-substances-and-mixtures

Chemists can classify matter as solid, liquid, or gas. But there are other ways to classify matter, as well — such as pure substances and mixtures. Classification is  ...

www.softschools.com/examples/science/pure_substances_examples/476

A pure substance is any single type of material that are made of only one type of atom or only one type of molecule. Also, a pure substance can be defined as ...

study.com/academy/lesson/pure-substance-in-chemistry-definition-properties-examples.html

May 3, 2015 ... This lesson introduces the concept of the pure substance. The impact of purity on the physical and chemical properties are discussed and ...

www.bbc.co.uk/education/guides/zypv34j/revision

Learn about pure and impure substances and how to investigate diffusion with BBC Bitesize KS3 Science.

www.ck12.org/book/CBSE_Chemistry_Book_Class_IX/section/2.8

Feb 18, 2016 ... An element is a pure substance that cannot be broken down into different types of substances. There are almost 120 known elements (figure ...