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Definition of the following?

I was reading through the chapter on oxidation states and I saw a table that states the usual oxidation states of some elements.

Hydrogen is +1 (except in Metal Hydrides where it is -1)

What are metal hydrides? Can someone provide a definition and example?

Oxygen is -2 (except in peroxides and compounds with F, where it is -1)

What are peroxides?




Thanks
Original post by xXxiKillxXx
I was reading through the chapter on oxidation states and I saw a table that states the usual oxidation states of some elements.

Hydrogen is +1 (except in Metal Hydrides where it is -1)

What are metal hydrides? Can someone provide a definition and example?

Oxygen is -2 (except in peroxides and compounds with F, where it is -1)

What are peroxides?




Thanks


metal hydrides are ionic compounds of metals and hydrogen, such as NaH (made up of Na+ and H-), or MgH2

peroxides are ionic compounds of metals and oxygen and contain the O22- ion, such as Na2O2
(edited 13 years ago)
Reply 2
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xXxiKillxXx
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14
Original post by Plato's Trousers
metal hydrides are ionic compounds of metals and hydrogen, such as NaH (made up of Na+ and H-), or MgH2

peroxides are ionic compounds of metals and oxygen and contain the O22- ion, such as Na2O2


Thankss.! And I read this on the internet:

The convention is that the cation is written first in a formula, followed by the anion.

For example, in NaH, the H is H-; in HCl, the H is H+.

Is this true for the AQA AS Chemistry specification?
Original post by xXxiKillxXx
Thankss.! And I read this on the internet:

The convention is that the cation is written first in a formula, followed by the anion.

For example, in NaH, the H is H-; in HCl, the H is H+.

Is this true for the AQA AS Chemistry specification?


Correct. Not only the AQA AS specification, but in chemistry generally, at all levels. You would never write CO3Na2, for example, always Na2CO3
Reply 4
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xXxiKillxXx
OP
14
Original post by Plato's Trousers
Correct. Not only the AQA AS specification, but in chemistry generally, at all levels. You would never write CO3Na2, for example, always Na2CO3


Thanks :smile:
Original post by Plato's Trousers
Correct. Not only the AQA AS specification, but in chemistry generally, at all levels. You would never write CO3Na2, for example, always Na2CO3


What about:

(CH3COO)2Ca

:biggrin:
Original post by charco
What about:

(CH3COO)2Ca

:biggrin:


yes, well apart from that one, obviously (and any others like it) :stomp:

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