Re: mineral,ore,rock,metal
farooq_w_at_hotmail.com
Date: 12/28/04
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Date: 28 Dec 2004 04:43:04 -0800
edwin wrote:
> In fact , I want to know which country this
> web forum belongs to.
Call it an international forum. There is sci.chem.de which is for the
peole who know German.
>
> 1)My chemistry book write that:
>
> The individual chemical
> compounds that make up rocks called minerals. Rocks/minerals from
> which we obtain metals are called
> ores.
>
> that means ore=rock??
You could look up any standard English dictionary. An ore is a
mineral/or combination of it, from which a metal can be economically
extracted.
> And rock is composed of mineral??
> can u also tell me the relationship and the difference among
> mineral,ore, rock and metal?
Rock is a more like general word. Mineral has special meaning, they are
naturally occuring substances having a definite (known) chemical
composition and distinct properties like color etc. Since the minerals
have known constituents they have names too. Ore is a mineral from
which you could obtain a metal profitably. Ore and mineral can be used
interchangeably in non-scientific discussion.
Are the following your homework questions?
>And also which is mixture and which is
> compound??Thx
You can find this in your book.
>
> b)Would you also tell me the relationship and the difference among
> limestone, calcite and calcium carbonate ??Also which is mixture and
> which is compound??
All of them contain calcium carbonate i.e calcium, carbon, oxygen bound
chemically together in a fixed ratio. Is it a mixture or a compound?
>
>
>
>
> 2)My book also write that:
> calcium hydroxide is often
> called slaked lime.It is slightly soluble in water .The saturated
> solution formed is called
> limewater.
>
> Is calcium hydroxide=slaked lime=lime water??
In a strict sense no. Calcium hydroxide is a solid which can be
dissolved in water to give you limewater. Slaked lime is a common name
of calcium hydroxide and is not to be preferred.
>
>
> 3a) calcium carbonate----heat----->calcium oxide+carbon dioxide
>
> b) calcium oxide+water--->calcium hydroxide
>
> c) carbon dioxide+calcium hydroxide--->calcium carbonate+water
>
> d)calciumcarbonate+carbondioxide+water->calcium hydrogencarbonate
>
> e)calcium carbonate+dilute hydrochloric acid-->calcium
> chloride+water+carbon dioxide
>
>
>
> May you tell me which is physical change and which chemical change
> from a-e??, thx a lot:P
A chemical change gives products that are different in chemical &
physical properties from the reactants and is accompanied by a new
arrangement of atoms. In (a) you heat calcium carbonate and get
calcium oxide + carbon dioxide, which are different from calcium
carbonate in their chemical and physical properties, carbon dioxide is
a colorless gas, calcium oxide is a solid containing calcium and
oxygen. Would this be a chemical change or not?
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