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A concentration of at least 5 p.p.m. of dissolved oxygen in a water system is required to support a large and varied fish population
(2019)
Ethanoic acid, ethanal and ethanol are three colourless organic substances, all liquids at 18 C
To determine the relative molecular mass (Mr) of compound X, a volatile liquid, a small volume of the pure liquid was vaporised in a suitable container
What are cathode rays?
To celebrate the 150th anniversary of the discovery of the periodic system, 2019 has been designated as the International Year of the Periodic Table of Chemical Elements by the United Nations (UN)
