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the stratopause is the end of the stratosphere.
the symbols used to represent an element or compound e.g. H2O for water
a group of very reactive chemical elements that readily lose their one valence electron to form...
dealing with quantities as well as the nature of the substances under consideration.
a group of organic compounds that can be represented by a general formula e.g. alkanes, alcohols...
if one variable increases, the other variable decreases at a fixed rate.