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Topic: Chemical Formulas  (Read 5713 times)

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Offline locagata48

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Chemical Formulas
« on: August 17, 2008, 05:01:06 PM »
Write formulas for the following substances

1) Sodium peroxide  Na2O2
2) Perbromic acid   HBrO3
3) Silicon dioxide  SiO2
4) Chromium (III) oxide  Cr2O3
5)Cobalt (III) nitrate  Co(NO3)3
6)Ammonium phosphate  (NH4)3PO4

Offline Yggdrasil

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Re: Chemical Formulas
« Reply #1 on: August 17, 2008, 05:07:29 PM »
All correct except for #2.  HBrO3 is bromic acid.

Offline yukiheart

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Re: Chemical Formulas
« Reply #2 on: August 18, 2008, 01:36:46 AM »
1/ Na-O-O-Na
2/HO-Br(O2)
3/O=Si=O
4/ O=Cr-O-Cr=O
5+6/ I cant draw in this topic!!!

Offline macman104

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Re: Chemical Formulas
« Reply #3 on: August 18, 2008, 08:09:07 AM »
1/ Na-O-O-Na
2/HO-Br(O2)
3/O=Si=O
4/ O=Cr-O-Cr=O
5+6/ I cant draw in this topic!!!
It doesn't ask for the structures, just the formulas

Offline yukiheart

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Re: Chemical Formulas
« Reply #4 on: August 22, 2008, 02:12:39 AM »
I m sorry!!!
#2 is bromic acid and : in wikipedia write :
The compound perbromic acid, HBrO4, is an oxygen acid of bromine. Other names include hydroxy-γ7-bromanetrione and hydroxidotrioxidobromine. Perbromic acid is unstable and cannot be formed by displacement of chlorine from perchlorate, as periodates are prepared. The acid was discovered when a sample of radioactive selenate, SeO42−, was left to decay. It is a strong acid, and strongly oxidizing, and is the least stable of the halogen(VII) acids. It decomposes rapidly on standing to bromic acid and oxygen, with the evolution of brown bromine vapour.

Offline AWK

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Re: Chemical Formulas
« Reply #5 on: August 22, 2008, 06:29:14 AM »
I think this is a test for nomenclature. Then name of perbromic acid can be used.
Quote
It decomposes rapidly on standing to bromic acid and oxygen, with the evolution of brown bromine vapour.
I doubt about this statement from wikipedia
AWK

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