Science & Mathematics - 5 January 2007

I need you help. I am trying to my Chemistry PPA in scotland.

The effect of Concentration Changes on Reaction rate.

By adding ameasured amount of water to the potassium iodide while keeping the total volume of the mixture the same.
ie. 1st : 100%potassium iodide (25cm cubed) + no water
2nd : 80% potassium iodide (20cm cubed) + 20% water (5cm cubed)
All other factors had to be kept constant in volume and concentration (1mol-1 sulphuric acid, 0.1 mol-1 hydrogen peroxide, 0.005 mol-1 sodium thiosulphate) also temperture.

Then we woek out the rate of reaction by doing a stop clock thing where we watch for it turnign black, and the dividing 1 by time. Draw a graphVolume of KI (cm cubed) against Rate s-1

anyway to the point WHAT IS THE CONCLUSUION OF THIS EXPERIMENT. I JUST DONT KNOW

2007-01-05 02:56:23 · 5 answers · asked by Anonymous in Chemistry

How do leaves get rid of excess water?

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wat is mitosis?

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I'm stuck on my assignment.

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A solution with I- and a sour solution with Cr2O72- is mixed. Cr3+ and I is the result of this. What is the formula for this reaction?

I basically don't know how to balance it.. The unbalanced thing I presume is Cr2O72- + Cr3+ --> I + Cr3+. Then, I'm lost!

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It is known that Gibberellic acid (GA1 and GA4) are the active form of GA in plants. in contrast to this fact people apply external GA3 to promote growth or germination. I am curious why tthey don't directly use GA1 or GA4.

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If 7% Tax Is Added To The Bill Of $13.34 Pay With A $20.00 Bill How Much Money Should They Get Back?

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i want to know how to price say 40cmx40cmx18mm panel of wood the cost of 1 cubic meter is 300pounds ,how much will the panel cost,and how many pices are in the cube and how is the calcuation done

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2007-01-05 02:34:16 · 2 answers · asked by Anonymous in Chemistry

I posted this in the wrong place, I just figured out what I'm doing, sorry. So here is is again.

This is a good one. There are several of us that are inflicted with the dreaded Sulfur Burps, we have gotten together here at yahoo to try to find an answer, the Dr's think we are crazy and tell us it will go away, don't worry about it, never heard it.

It is a very real debilitating chronic problem for many of us.

We need a biochemist to help us I think.

I have done a lot of research but since I know nothing much about Chemistry and the reaction of chemicals, I'm here.


I know that sulfur is blamed for the smell, the smell of rotten eggs. I know that the odor associated with rotten eggs is actually due to hydrogen sulfide.

I know that many metal sulfides are so insoluble that they are probably not very toxic. Some metal sulfides, when exposed to a strong mineral acid, including gastric acids, will release toxic hydrogen sulfide. How does this happen? What would cause such a reaction?

When I learned this I said, Aha.. gastric acids and metal sulfides have something to do with this, so now what is a metal sulfide? What is the correlation between Gastric Acid and Metal Sulfide?

Now, I just read something about foods that have the additive sulfur dioxide.

I know that there must be a chemical reaction going on in the stomach causing the burping smell of rotten eggs/sulfur.

People have had all sorts of tests done with no results, tried all kids of meds with no results. It's like the food in sitting in the stomach and rotting causing Hydrogen Sulfide to build to the point it explodes and that's how you feel, like you are just going to explode.

There are all sorts of speculation about it being caused by a parasite, a virus, an allergy. And I think it is a chemical reaction to things that maybe we are sensitive to. So it would be an allergy to the chemicals in certain food.

If any one can answer this question I will nominate you for chemist of the year.

Thank you for taking the time to read my post..

2007-01-05 02:33:55 · 3 answers · asked by Anonymous in Chemistry

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2007-01-05 02:33:10 · 4 answers · asked by Anonymous in Mathematics

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To the North is Kazakhistan. To the East is China.
To the South is Tajikistan. To the West is Uzbekistan.
And what is it's Capital city?

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is it not adorable?....raising cattle on a ranch growing up i have never seen anything like this but i suppose that i have a soft spot for this little guy because i have had a number of calves die in my arms....this thing is so ugly its cute! what other mutations have you seen?
http://www.sun-sentinel.com/news/custom/fringe/sfl-14twofacedcalf.jpg,0,2739112.photo?coll=sns-newsnation-headlines&track=mostemailedlink

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