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What are they? |
How are they named? | If we
know the formula | If we know the name
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Examples | Exercises |
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What are they?
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They are compounds formed by a metal and hydrogen, in which
the hydrogen has an oxidation number –1.
The hydrides of groups 1 and 2 are more ionic than
covalent. The hydrides of groups 13 and 14 are more covalent than ionic. But
they have the same name, except boron hydride which is named as H + nometal
compound.
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How are they named?
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The name is formed by two words. The first word is the name
of the metal. The second word is the root of hydrogen plus the suffix "–ide"
METAL hydride
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If we know the formula
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In the formula: Write the name of the metal followed by "hydride".
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If we know the name
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In the name: Remember that you must know the symbols
of the elements and the oxidation numbers which are invariable.
1. Write the symbol of the first element.
2. Write the symbol of the hydrogen.
3. The number of hydrogen matches up with the oxidation number of metal.
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Examples
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| LiH |
Lithium
hydride |
| CaH2 |
Calcium
hydride |
| AlH3 |
Aluminium
hydride |
| GeH4 |
Germanium
hydride |
| SnH4 |
Tin hydride |
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Exercises
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In Formulae you have an exercise to write the names of these substances
and to check your results. You also have the answer to the exercise.
In Names you have an exercise to write the formulae for these substances
and to check your results. You have to introduce the formulae without
subscripts, for example for water = H2O. You also have the answer to the
exercise.
   
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