Chemistry - March 2007

Can you calculate the mass of aluminium oxide, Al2O3, needed to produce 1,0 tonnes of aluminium?
(1.0 tonne= 1.0 x 10^6g)

2007-03-04 00:35:12 · 4 answers · asked by Anonymous

If phenolphthalein solution was substituted for bromothymol blue in an experiement, what color would you expect to see in baking soda and citric acid?

2007-03-04 00:04:40 · 2 answers · asked by Patty M 1

2007-03-04 00:04:07 · 2 answers · asked by v-jay 1

What are the products if an acid salt (eg KHSO4 or NaHSO4) is reacted with CaCO3? I always assumed H20 was a product, but the eqn doesn't balance, i know CO2 is a product but what else?

2007-03-03 23:59:56 · 2 answers · asked by drcoxscrubs 2

I heated up Magnessium in a crucible, and I think it produced MgO.

then after it cooled I added a few drops of water and it produced NH3. (I could tell by the smell.)

How/ why did it turn into NH3?

what is the equation?
MgO + H2O ----> NH3????
It doesnt make sence..... where did the Mg go, and where did the Nitrogen and hydrogen come from???

2007-03-03 23:59:55 · 1 answers · asked by Samantha C 1

a coal burning power station produces 70tonnes of sulpher dioxide in one day. what mass of sulphuric acid h2so4 is produced in the atmosphere if it reacts with oxygen and water as follows...

2so2+o2+2h2o forms 2h2so4 The answer is 107 tonnes but can someone show the workings.Thank you so much,I'm really struggling!

2007-03-03 23:45:38 · 5 answers · asked by Anonymous

2007-03-03 23:37:28 · 2 answers · asked by rck_figo 1

2007-03-03 23:35:58 · 2 answers · asked by Mary S 1

A. C2H2
B. C4H8
C. C2H3
D. C2H4

2007-03-03 23:35:34 · 3 answers · asked by Anonymous

Molecules of both benzene (C6H6) and glucose (C6H1206) have structures containing six-membered rings. Why is glucose soluble in water, while benzene is not?

2007-03-03 23:34:08 · 2 answers · asked by hiscageofstars 1

what experiment tests would you carry out to decide whether a solid is an ionic substances?

2007-03-03 23:28:37 · 1 answers · asked by Anonymous

A. concentrated sugar solution
B. gastric fluid
C. pure water
D. concentrated sodium hydroxide solution

2007-03-03 23:26:52 · 4 answers · asked by Anonymous

A. Present in natural gas
B. An alkane
C. A hydrocarbon
D. Present in gasoline

2007-03-03 23:23:10 · 4 answers · asked by Anonymous

2007-03-03 23:14:14 · 2 answers · asked by vnnartist 1

cf4 has polar bonds yet is a non-polar molecule. explain.

2007-03-03 23:09:54 · 2 answers · asked by Anonymous

how can the bonding type be related to the electronegativities of the elements?

2007-03-03 23:02:55 · 1 answers · asked by hiscageofstars 1

need to show work not good at this stuff at all thanks.

2007-03-03 23:00:45 · 3 answers · asked by ms_mw_2004 1

can any one tell me the level of water hardness for the dorset area in uk?

2007-03-03 22:59:59 · 2 answers · asked by Anonymous

ka= multiplication of concentration of products / multiplication of concentration of reactant.
For example A+B give us C+D
Ka= [A] * [B] /[C]*[D]

2007-03-03 22:45:05 · 2 answers · asked by Anonymous

what % of SiO2 is in this mixture. need to be able to show my work not just give the answer help.

2007-03-03 22:39:44 · 1 answers · asked by ms_mw_2004 1

Im pretty much screwed for my exam in a week! omg a week :(
we are doing about alloys elements etc stuff like that and i just dont understand it?

any tips for a thick mug lol ?

2007-03-03 22:37:31 · 7 answers · asked by SuperSexyRaysie 1

A scientist in japan proved it! He wrote thank you n i'll kill you on the two test tubes filled with water. Then after freezing the water he examined these freezed crystals under a microscope. The thank you one crystal was very beautiful but other was ugly n irregular in shape. What you say?

2007-03-03 21:30:13 · 18 answers · asked by Goosebump 2

I have a project wer we need to use dirty water, add chlorine to it and send it to a lab to test for the conponents. Can anyone giv me information or sites which can help? I need images of water with chlorine and water without chlorine. And anything related! I know it's a lot to ask, so a little help is really appreciated!!!

2007-03-03 21:28:14 · 2 answers · asked by asphyxia 3

There is a gas mix that made from CO + CO2. Oxygen is the 65% of it. How many CO2 is in this mix? How did you solve it?

2007-03-03 21:10:40 · 1 answers · asked by Anonymous

2007-03-03 21:01:19 · 13 answers · asked by A-Lo 1

This is for a chemistry project, and i have been working hard at it; but all i have discovered are solvents for caffeine. If someone could give me a few (cheap) ideas, it would be most welcomed.
P.S the result i want is pure (or near pure) crystals of caffeine

2007-03-03 20:53:46 · 1 answers · asked by gabrielwyl 3

2007-03-03 20:49:08 · 1 answers · asked by ms_mw_2004 1

2007-03-03 20:48:41 · 1 answers · asked by pratheesh 1

When pH of water sample was monitored,it was found that there is regular gradation in pH value>whats reason?
pH dropped from 7.1 to 3.9 in 6 days? pls answer with sufficent references..

2007-03-03 20:46:36 · 3 answers · asked by pratheesh 1

Is the coulour we see totaly diferent to what we think and see it as. For example, could the colour blue realy be green and we just see it as blue. Are there also any colours that we canot see so we see them as another colour.

2007-03-03 20:35:23 · 4 answers · asked by mrboeing 1