Chemistry - May 2007

I'd like to know the refraction index and Abbe number (dispersion) of PDMS

2007-05-28 20:45:47 · 1 answers · asked by big Q 1

2007-05-28 20:37:05 · 6 answers · asked by gabby o 1

fill in the blanks

2007-05-28 20:22:30 · 6 answers · asked by Anonymous

2007-05-28 19:47:01 · 4 answers · asked by Anonymous

2007-05-28 19:21:02 · 1 answers · asked by Makoy 2

The acidic waste from a students experiment needs to be disposed of, but puring it down the sink would increase the impact of acid rain on the local water supply. Explain how you could determin ethe amount of limestone needed to neutralize the environmental impact of the experiment (assume that the limestone is mainly calcium carbonate). Wrtie balanced equations for any reactions you intend to use

2007-05-28 17:37:23 · 2 answers · asked by Anonymous

Does glucose react with water, and if it does whts the balanced equation? I know this is probably not possible since respiration uses glucose+ O but im not sure!

2007-05-28 17:36:14 · 4 answers · asked by X 2

I somewhat understand Le Chatelier's Principle and equilibrium but this lab hasn't really explained much which is giving me a hard time answering its Analysis Questions. Please help.



"Explain why BTB is green in neutral water solution. In terms of Le Chatelier's principle why does it turn yellow when acid is added, and blue when base is added?"




I always thought BTB turns these colors because of its function as an acid/base detector. I didn't know there was an inside explanation behind it. How to explain this behavior in terms of Le Chatelier's Principle?

2007-05-28 17:35:34 · 3 answers · asked by Anonymous

(a) water molecules only
(b) hydronium ions only
(c) hydroxide ions only
(d) water molecules, hydronium ions, and hydroxide ions

2007-05-28 17:27:58 · 9 answers · asked by Anonymous

how do you score better on the chem SAT II's? especially the true/false section?

2007-05-28 17:21:35 · 3 answers · asked by G 2

2007-05-28 17:15:54 · 6 answers · asked by mel s 2

2007-05-28 17:02:37 · 3 answers · asked by T-Rex84 1

Determine the pH of a 1.0M NaC3H5O3 if .1M solution of HC3H5O3 has a pH of 2.44

2007-05-28 16:41:33 · 3 answers · asked by lariru 2

KOH reacts with (NH4)2SO4 and NH3 is produced.

(does not need to be balanced, i can do that myself)

thanks

2007-05-28 16:41:02 · 1 answers · asked by Anonymous

Okay, Answers crew, do any of you have pH paper and Softsoap lying about? I would like to know the pH of softsoap because I suspect that it is too alkaline for my skin and causing an unpleasant allergic reaction on my hands, but I have no pH paper and therefore no way to verify this hypothesis. Can anyone test this for me or otherwise provide information on the alkalinity of Softsoap? Thanks. (In case you need the extra info, it's the clear kind, nothing special, just basic Softsoap clear hand soap.)

2007-05-28 16:35:08 · 3 answers · asked by M W 2

I don't have any additional details, but any ideas?

2007-05-28 16:05:26 · 1 answers · asked by sdog 3

what is the meaning of colorfast & what makes it different from non-colorfast pigments?

2007-05-28 15:42:40 · 2 answers · asked by taulmachof 1

How do acid/base indicators work?

What makes an indicator (they are usually slightly acidic) change color when titrated with a base?

2007-05-28 15:18:49 · 7 answers · asked by Dave H 2

what difference between soda ash and soda ash dence ?

2007-05-28 15:16:33 · 1 answers · asked by Sing Hao 1

I have a project, and I need to know what type of materials Windex uses for packaging their product. Also, a link to where I could find a structural formula for the materials it uses (chemistry) would be greatly appreciated. Thank you.

2007-05-28 14:46:32 · 1 answers · asked by Irfan B 1

How do you convert from grams to calories?
I'm burning biodiesel oils, and i got the amount of oil that was burned, but how do I convert from grams to calories?

2007-05-28 14:14:37 · 5 answers · asked by wongtongsoup22 2

IN every problem copper is my cathode but the anode changes such as one is copper then iron and lead, magnesium, and so forth. It asks me to complete anode half- reaction and cathode half - reaction and then the cell reaction. I dont really know how to go abou7t this maybe if someone could walk me through one of the above examples such as copper copper or copper iron then i could do the rest. Copper is the cathode in every problem the other metal is the anode? Can someone please explain this to me? Not only do i Have this assignment to turn in soon but it will be on my next test. THank you

2007-05-28 14:07:46 · 2 answers · asked by Anonymous

1. KOCH2CH3 2. NaOCH2CH3 3. NaOC(CH3)3 4. NaOH

2007-05-28 14:07:14 · 2 answers · asked by Anonymous

let's just say I need to recreate the smell of a very expensive parfume??I know about artificial "noses" doing spectral analisys but after they tell you waht is the composition what? How difficult and expensive it would be to recreate that composition in 5ml bottle for example?

2007-05-28 13:57:02 · 2 answers · asked by val_nanev 1

I need to do the 2 equations for HNO3 that show that it is amphiprotic. I'm completely lost though.

2007-05-28 13:18:05 · 1 answers · asked by Elle 2

please help! thank you!

2007-05-28 13:14:39 · 4 answers · asked by Anonymous

(a) 10-14- [OH-]
(b) is always basic
(c) is always neutral
(d) may be either acidic, basic, or neutral

2007-05-28 13:11:50 · 2 answers · asked by Anonymous

If an experiment is performed at pH 3:

(a) I can adjust the ionic strength to 2 x 10-4
(b) I cannot adjust the ionic strength to 2 x 10-4
(c) The ionic strength must be 2 x 10-4 and cannot be changed
(d) The ionic strength must be 1 x 10-3 and cannot be changed

The teacher told us the answer is B, Can someone please explain to me the principle behind it and why the others are wrong. Thanks!

2007-05-28 12:44:32 · 1 answers · asked by Anonymous

My chemistry teacher told me that arsenic is (or can be) naturally occuring in almonds. Is this true? And if it is, why don't we get sick? Because I read in a book of mine that arsenic is lethal in doses as small as 65 milligrams. So if I eat a box of chocolate almonds, why don't I get sick?

2007-05-28 12:27:54 · 6 answers · asked by Michael G 2

what 3 technologies that i can compare to concentrate juice (esp. orange juice)

2007-05-28 12:09:10 · 1 answers · asked by precious 1