Chemistry - April 2007

Chloroform can cause cancer but Chloroform is also an effective cough suppressant that has been used in many over-the-counter medications. Children's cough syrups used to contain several percent of Chloroform. To what extent does this provide convincing evidence that Chloroform in drinking water is not a health hazard and therefore that Chlorination of drinking water is safe?

2007-04-13 04:45:14 · 2 answers · asked by Anonymous

Ok. Two Problems. Write balanced redox equations and determine both the cell potential and the number of electrons transferred for the spontaneous redox process that occurs when the following couples are connected.

What are the redox equations, cell potential, and electrons transferred?(for a and b )
a) Ni^2+/Ni + Pb^2+/Pb
b) H^1+/H2 + Al^3+/Al

This is the one that I did...
I was given Cl2/Cl^1- + Br2/Br^1- (as the redox couples)
The equation I made was: Cl2+2Br^1- -> 2Cl^1-+Br2
The cell potential was .27.
And I think electrons transferred was: 2.

2007-04-13 04:38:27 · 2 answers · asked by lapyramid 5

a) the number of moles of t-BuCl used.
b) the number of moles of HCL produced by complete solvolysis of 1.00 ml of t-BuCl
c) the volume in milliliters of 0.350M NaOH required to neutralize the HCL produced by complete solvoysis of 1.00 ml of T-Bucl.
d) the volume in ml of 0.350M NaOH required to neutralizr the HCL produced when solvolysis of 1.00 ml of T-buCl is 75 % complete.

2007-04-13 04:20:06 · 2 answers · asked by Anonymous

What correlations can be drawn about the difference in electronegativity between bonded atoms and their tendency to form ionic or covalent bonds?

2007-04-13 04:18:16 · 4 answers · asked by Anonymous

2007-04-13 03:20:43 · 13 answers · asked by Nicky . 2

How do I solve this problem ?

A step by step would be great, or if you have the answer then that would help also..

2007-04-12 23:29:25 · 1 answers · asked by kneegr0w_j0hn 2

2007-04-12 21:43:02 · 3 answers · asked by apple 1

yesterday I had a solution with ph 6, then I put NaOH and I rised the ph to 7, afterwards I put 200 mL of dest water (ph 7.8), but the ph of the solution remined at 7, why the water adding didnt increase the pH????

2007-04-12 20:12:23 · 2 answers · asked by Anonymous

what is the ionic lattice?? is it the same as ionic bonding?
urgent help please

2007-04-12 19:34:16 · 7 answers · asked by i_luv_leoku_4eva 1

In lab, I mixed H2SO4 and Na2S and got a white precipitate as well as H2S gas (rotten egg smell). I am now trying to describe this with a net ionic equation - I know one product, but what's the white precipitate? And is there a redox reaction going on as well?

2007-04-12 19:20:38 · 7 answers · asked by Lily H 1

The proton magnetic resonance spectrum of N,N-dimethylformamide shows two different chemical shifts for the hydrogen atoms on the methyl group. This phenomena is not due to spin-spin coupling.

If not, what is it due to?

2007-04-12 19:19:49 · 2 answers · asked by jeanettervetr 2

2007-04-12 17:59:57 · 2 answers · asked by 41 1

2007-04-12 17:26:20 · 2 answers · asked by keru_ganu19 1

2007-04-12 17:23:24 · 3 answers · asked by monkeynurse 2

The British thermal unit (Btu) is commonly used in engineering applications. A Btu is defined as the amount of heat required to raise the temperature of 1 lb of water by 1°F. There are __________ joules in one Btu. 1 lb = 453.59 g; °C = (5/9)(°F - 32°); specific heat of H2O (l) = 4.18 J/g-K.

2007-04-12 16:44:18 · 2 answers · asked by Anonymous

how much heat energy would be required to change the temperture of 125g of ice from -32.9c to liquid water at 75c?

2007-04-12 16:08:10 · 1 answers · asked by JERRY R 1

2007-04-12 16:02:29 · 1 answers · asked by 41 1

i need help with a few problems balancing chemical equations. any help will be appreciated. best answer for the right answers, if that helps any.

1) NH₃ + O₂ → N₂ + H₂O

2) NaOH + H₂CO₃ → Na₂CO₃ + H₂O

3) K + B₂O₃ → K₂O + B

4) C₅H₁₂ + O₂ → Sn₃(PO₄)₄ + K₂SO₄

5) Sn(SO₄)₂ + K₃PO₄ → Sn₃(PO₄)₄ + K₂SO₄

2007-04-12 15:59:37 · 1 answers · asked by ben. 3

i don't understand how to do this problem and if someone could show me how to do it step by step, it would be greatly appreciated. thanks.

2007-04-12 15:29:46 · 3 answers · asked by ? 4

A student found that a reagent bottle containing FeSO4 solution had remained unstoppered overnight. The FeSO4 solution was pale yellow. Briefly explain what had probably occured.

2007-04-12 15:29:20 · 3 answers · asked by Hello 1

2007-04-12 15:28:36 · 6 answers · asked by soccrguy90 2

so, the ions that make up butane aren't big, right, so it should be harder for water to break it apart. however, it's c4h10, meaning it's got all these carbon atoms hanging off it that could probably break off.
then i checked it on wikipedia and it says its solubility, so it must be soluble. but at the same time, it's alkaline from the catagory of methane, ethane...and these aren't soluble. so, what IS it?

2007-04-12 15:23:07 · 2 answers · asked by thebrainwaver 2

i mean, it's ch3cooc6h4cooh (what a mouthful). ya, so it's got hydroxide- shouldn't it be a base? but it's not, apparantly, but why?

2007-04-12 15:17:57 · 3 answers · asked by thebrainwaver 2

thank u for answering

2007-04-12 15:16:21 · 2 answers · asked by Anonymous

the following outer configurations?

a) s^2
b) s^2p^5
c) s^2d^5

I'm not a slacker just expecting answers.. I'm having a lot of trouble with electron configurations because in my previous class, I have not learned it unlike my new class. I'd be nice if someone can provide explanations as well. Thanks in advance..

2007-04-12 15:12:53 · 1 answers · asked by ockristy 1

What are things you know about our famous John Dalton?

BTW What was one thing interesting?

2007-04-12 15:07:41 · 1 answers · asked by Anonymous

will it?

2007-04-12 14:57:06 · 5 answers · asked by speedingdownlife 1

Fill in the correct comparative phrase for each of the following statement. Explain your choices.

a) The vapor pressure of H2O with surface area of 5.0 cm^2 is____________________ (greater than, less than, the same as) the vapr pressure oh H2O with surface area of 50.0 cm^2

b) The vapor pressure of H2O at 25 C is _____________ ( greater than, less than, the same as) the vapor pressure of H2O at 75 C.

2007-04-12 14:48:17 · 1 answers · asked by Alan l 1

Why does a pH of 0 indicate a strongly acidic solution?
Why does a pH of 14 indicate a strongly basic solution?

2007-04-12 14:42:34 · 3 answers · asked by wongtongsoup22 2

2007-04-12 14:35:59 · 1 answers · asked by gennady88 1