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Offline Karl Woodham

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Chemistry questions
« on: 30/11/2003 15:22:22 »
Hi,
Some questions puzzling me I'm afraid..

1) What C reacts with water to give a white alkaline solid?
2) What N when mixed with Oxygen forms an acidic oxide?
3) Zinc will J????? displace iron from iron sulphate solution.

Any help greatly appreciated.

Karl
« Last Edit: 25/03/2004 08:36:00 by NakedScientist »


 

Offline Quantumcat

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Re: Chemistry questions
« Reply #1 on: 01/12/2003 15:51:29 »
Okay, what you have to do, is write down all the things you've been told are white alkaline solids and all the rest, then do: C____(what you want to find) + H20 = ___(one of the white alkaline solids) then just go through all the while alkaline solids you know until you find one that works for the equation. I don't know what you mean by "J????"

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Offline chris

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Re: Chemistry questions
« Reply #2 on: 01/12/2003 23:08:18 »
N - Nitrogen - Nitrogen Dioxide can react to form nitrous acid.

C - ? Calcium - Calcium hydroxide - lime water  ?

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Offline Quantumcat

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Re: Chemistry questions
« Reply #3 on: 02/12/2003 13:15:46 »
Don't tell him answers, chris! He won't learn anything that way.

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Offline chris

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Re: Chemistry questions
« Reply #4 on: 02/12/2003 22:55:13 »
I'm not sure they're right though ! What do you think ?

Calcium hydroxide is the product and it's soluble - not a white solid (unless you dry it out)

Also, nitrogen dioxide forming nitrous acid is a subsequent step so can you call it an acidic oxide ?

Where's cannabinoid when you need him ?

Chris

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Offline chris

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Re: Chemistry questions
« Reply #5 on: 02/12/2003 22:55:53 »
And why is this post in the medicine section ?

Chris

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Offline nilmot

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Re: Chemistry questions
« Reply #6 on: 03/12/2003 08:30:38 »
Karl,

I don't think you've got the question written down right.
Can you be more specific?
What's C? Are you looking for an element or a compound...etc
And what topic of Chemistry is this on?

I mean J????????

Tom
« Last Edit: 03/12/2003 08:31:17 by nilmot »
 

Offline Ylide

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Re: Chemistry questions
« Reply #7 on: 03/12/2003 09:11:03 »
1) What C reacts with water to give a white alkaline solid?

As Chris said, shis would probably be Calcium.  All the alkaline and alkaline earth metals in pure form react (usually rather exothermically) to form metal hydroxides.  Calcium hydroxide is a white, chalky powder.  (only slightly soluble)


2) What N when mixed with Oxygen forms an acidic oxide?

That would also be as Chris said...nitrogen and oxygen, at high temperatures, can form nitrogen dioxide, which forms nitric and nitrous acid both (pretty sure in equimolar amounts) in water, as do all non-metal oxides.  I don't like the phrasing of this question though...simply "mixing" nitrogen and oxygen is not sufficient to form nitrogen dioxide; if it were, we'd have no breathable atmosphere as those are the two main components of what we breathe.  It really only occurs in the combustion of nitrogenous substances in the presence of oxygen (btw NO2 is amajor air pollution product...this is what makes acid rain)


3) Zinc will J????? displace iron from iron sulphate solution.

I'm not sure what you mean by this question...are you asking if zinc will displace iron in an iron sulfate solution?

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Offline chris

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Re: Chemistry questions
« Reply #8 on: 03/12/2003 22:43:59 »
This post reminds me of a fantastic book I have been sent for review from America - "Caveman Chemistry" - I'll post a review of it shortly. It's ace. Explains the chemistry of making your own glass, paper, gunpowder, glue, fire etc etc. Right down to the recipe for a good way to make potassium nitrate (saltpeter).

Chris

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Offline Ylide

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Re: Chemistry questions
« Reply #9 on: 05/12/2003 18:24:27 »
Doesn't the "home grown" recipe for saltpeter involve extracting it from bat guano or bird droppings or something?  That book sounds terrific though.  





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Offline Donnah

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Re: Chemistry questions
« Reply #10 on: 05/12/2003 22:51:08 »
Saltpeter, doesn't that make men....er droopy?
 

Offline Ylide

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Re: Chemistry questions
« Reply #11 on: 06/12/2003 04:49:36 »
Indeed.  It used to be given in some male institutions as it prevents the little soldier from going out to war, as it were.  However, I believe this practice has been discontinued as there are some ill health affects associated with its ingestion.  Chris or one of the other docs might know more.  

I'm sure the book Chris mentions is referencing it as a component of gunpowder.

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Re: Chemistry questions
« Reply #11 on: 06/12/2003 04:49:36 »

 

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