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C5 ­ Chemicals of the Natural Environment ­ Answers
1. The air contains a number of gases. The amount of water vapour in the air varies from place to place, and day to day. For this
reason, the proportions of the gases in the air are usually given for dry…

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When magnesium sulfate dissolves if forms magnesium ions and sulfate ions.
When potassium chloride dissolves it forms potassium ions and chloride ions.
When potassium bromide dissolves it forms potassium ions and bromide ions.
Magnesium ions each have two positive charges. Chloride ions each have a single negative charge. For the…

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molecules and phosphate groups. Attached to this are the four bases adenine, guanine, cytosine and thymine. The
sequence of these bases comprises the genetic code.
22. Almost all molecules in living things contain carbon. Carbon moves in a cyclical way, passing from one organism to another in
the biosphere, and…

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expensive to melt it. Instead, it is dissolved in molten cryolite, an aluminium compound with a lower melting point than
aluminium oxide. The use of cryolite reduces some of the energy costs involved in extracting aluminium.
Aluminium metal forms at the negative electrode and sinks to the bottom of the…


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