Mixtures – two or more substances that are not chemically combined<span> with each other and can be </span>separated<span> by physical means. The substances in a mixture retain their individual properties. Solutions – a special kind of mixture where one substance dissolves in another.</span>
HCl is an acid, C5H5N is a base, Cl is an acid, and HC5H5N is an acid.
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Oxygen
Explanation:
Joseph Priestly's contribution to chemistry was the discovery of oxygen gas.
He was one of the notable chemist of his day. He lived from 1733 - 1804 and in 1774, discovered oxygen.
- He was one of the foremost scientist to discover the gaseous exchange process that occurs during photosynthesis.
- His works showed that plants absorbs carbon dioxide and releases oxygen gas into the atmosphere.
Learn more:
Photosynthesis brainly.com/question/2761166
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