Re: mineral,ore,rock,metal

farooq_w_at_hotmail.com
Date: 12/28/04 

Date: 28 Dec 2004 11:13:56 -0800

edwin wrote:
>You are nice,ha~Actually,no
>Sorry, Excuse me.I want to ask a few questions.
>1)Oxygen can supply burning whereas nitrogen does not.
>Is it a physical property or chemical property for oxygen??

Identify whether burning is a chemical process or not? Since burning
involves a chemical reaction... would it be chemical or physical
property of oxygen?

>2) b) calcium oxide + water---> calcium hydroxide

>d)calciumcarbonate+carbondioxide+water------->calciumhydrogencarbonate

>In this case, Are calcium hydroxide and calcium >hydrogencarbonate
solid form or liquid form??
>What about them in reality??

Though it is good to be inquisitive, you are trying to run before
learning to walk. Knowing whether calcium hydroxide or calcium
hydrogencarbonate are solids requires experience, learning and good
observation, which after sometime you will begin to guess youself. I
don't want to confuse you but after you will learn the symbols and be
able to write equations in symbolic form, chemists use "state symbols"
s, l, aq and g for solid, liquid, aqueous and gas respectively for each
reactant and product. This requires that the person writing the
equation knows the physical state (by his observations, experiments) of
his reactants and products. Suppose you mixed solid calcium oxide and
water and a chemical reaction took place between them, so you would
write

calcium oxide + water ---> calcium hydroxide
as CaO(s) + H2O (l) ---> Ca(OH)2 (aq)

>3)What is the difference between EVAPORATION and >CRYSTALLIZATION?? Is
that we use fire to carry out >evaporation when we don't use fire to
carry out >crystallization correct??

Evaporation is one of the technique of crystillization. Both the terms
are different and have a special meaning. Consult your book.

>4)Last question, what is the difference between fire and
>flame??
You'd better ask an Englishman.

>and why the air hole of Bunsen burner opened give us a >hotter
,irregular and non-luminous blue flame??

What happens when you open the air hole? Find out the purpose of air
hole. The color of flames is a really interesting topic. You will most
probably learn in higher classes as to what causes the flame to appear
blue or yellow when the air hole is closed.

Remember that either a dumb or a genius questions the obvious. So do
ask questions but think well before what you write and don't worry
about trivial details such as whether calcium oxide is solid or not,
whether fire or a flame are samething or not for the time being.

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