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19 June, 11:36

Which sample of matter is a single substance?

(1) air (3) hydrochloric acid

(2) ammonia gas (4) salt water

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  1. 19 June, 14:45
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    Any substance that is made up of only one type of atom or molecule is said to be a pure single substance whereas substance that is made up two or more different elements or molecule is said to be a mixture.

    Air: Different types of gases are present in air that is nitrogen, water vapors, oxygen etc. So, air is a mixture.

    Ammonia gas: It consists of only one molecule namely ammonia throughout the substance so it is a pure single substance.

    Hydrochloric acid: It is made up by dissolving hydrochloric gas in water so it is a mixture.

    Salt water: It is mixture as water and salt are being mixed which are two different substances.

    Hence, ammonia gas is a single substance.
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