Answer in one word/ a few words.

A pure substance formed when atoms or molecules of different elements combine.

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Solution

A pure substance is a chemical substance that is composed of a particular set of molecules or ions that are chemically bonded.
Example:
Two molecules of hydrogen combined with one molecule of oxygen to form water.
$2 H_{2} + O_{2} ⟶ 2 H_{2} O$

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Similar questions

Name the following:

(a) A particle that is formed when two or more atoms combine.

(b) Molecules having atoms of the same kind.

(c) A substance that is neither solid nor liquid, but has properties of both.

State the terms :

(a) Substances whose atoms or molecules are arranged in a definite pattern.

(b) Different forms of an element found in the same physical state.

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