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a collection of more than one pure substance in no fixed proportion.
the separation of a dye into the different colours that make up that dye, as a result of the...
the stratosphere extends from a height of 10 km to 50 km above the surface of the Earth.
a very small, negatively charged particle that moves around the nucleus of an atom.
sulfur dioxide is extremely soluble in water, forming sulfurous acid. This acid oxidises to form...