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14 Cards in this Set
- Front
- Back
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The valency number is the same as |
the amount of electrons lost or gained. |
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Simple formulae for 2 element compounds |
1. Symbols 2. Valencies 3. Cancel any common factors 4. Cross over the valency & write subscript 5. Remove '1' if present |
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Prefixes mono = di = tri = tetra = penta = hexa = hepta = |
1 2 3 4 5 6 7 |
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A group ion that has more than one kind of atom, its valency is taken from its |
charge eg. NH4+ -Positively charged by 1, valency = 1 |
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Roman numerals can be used to show |
valency |
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If more than one group ion is present you use |
brackets |
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ionic compounds conduct electricity when... |
molten or in solution |
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ionic compounds have... |
high melting points |
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Ammonium compounds abd compounds containing metal should be assumed to be... |
Ionic |
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unless they are _______ or _________ at room temperature |
liquid or gas at room temperature |
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In all chemical reaction one or more new ___________ are formed |
substances |
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How do you work out the number of moles? |
mass ______________ formula mass |
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How do you work out the mass? |
number of moles x Formula mass |
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How do you work out the Formula mass? |
mass ___________________ Number of moles |
