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5 cards from this section. Quick, good the night before a test.
Give two differences between an element and a compound.
Think about the kinds of atoms present and whether the substance can be broken down.
Sort these into elements, compounds and mixtures: oxygen, water, air, gold, sugar solution, carbon dioxide.
Ask whether each has one kind of atom, a fixed formula, or a composition that can vary.
Which of these is a compound?
Look for the substance with a chemical formula made of two elements.
Which property belongs to a mixture?
Think of iron filings in a mixture still being attracted by a magnet.
You are given a clear, colourless liquid. Describe two tests that would show whether it is a pure compound or a mixture, and explain what each result would mean.
Use the facts that pure substances have fixed boiling points and that dissolved solids are left behind on evaporation.
A sample contains common salt, sand and ammonium chloride. Plan how to separate all three, and explain why each step works.
Use the property that makes ammonium chloride different first, then solubility in water.
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