I need Helps . Decomposition Reaction WE

  • Thread starter honeyDew
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  • #1
honeyDew
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I need Helps... Decomposition Reaction WE

is this how you're supposed to write a decomposition reaction in a word equation?

Copper (II) hydroxide decomposes with heat into the copper (II) oxide and water

...so then the water in this one would be a liquid right?
 

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  • #2
The Bob
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honeyDew said:
...so then the water in this one would be a liquid right?
Assuming it is under the correct temperature, the water will be water vapour, thus, a gas.

The Bob (2004 ©)
 
  • #3
honeyDew
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well we placed it into a hot water bath ...and constantly stirring it ... the color change so i guess it's gas ...right?
 
  • #4
The Bob
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honeyDew said:
well we placed it into a hot water bath ...and constantly stirring it ... the color change so i guess it's gas ...right?
What changed colour? The water?

The Bob (2004 ©)
 
  • #5
Nerro
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The colour change tells you that the [tex]Cu(OH)_2[/tex] has changed somehow chemically. Since the most likely change is dehydration that is what you should reasonably assume is what happened. Basically the [tex]Cu(OH)_2[/tex] was probably hydrated to some extent and what happened is that you have removed this crystal water by heating the hydrate. [tex]Cu(OH)_2.nH2O(s) \xrightarrow{heat} Cu(OH)_2(s)~+~nH_2O(g)[/tex] describes this reaction.

When the [tex]Cu(OH)_2[/tex] decomposes it leaves [tex]CuO[/tex] and [tex]H_2O[/tex]. The [tex]H_2O[/tex] will be released at temperatures of around [tex]185^{o}C[/tex] which is unlikely to be achieved in a hot water bath.
 
  • #6
honeyDew
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oh I see now...thank you so much for your helps :)
 

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