Chemistry - September 2006

we can use only atomic numbers of 1 to 12.

2006-09-30 06:39:15 · 3 answers · asked by Reshma 1

Using Le Chatelier's Principle, explain what is happening in the test tubes

HInd + OH- <===> Ind- + H2O

Place several drops of thymolphthalein indicator into each of three test tubes.

To the first tube add about 1 mL of 0.1 M hydrochloric acid (HCl).
-No visible change

To the second tube add about 2 mL of 0.1 M ammonium hydroxide (NH4OH).
-blue solution formed, white ppt appeared on standing

To the third tube add about 1 mL of 0.1 M sodium hydroxide (NaOH).
-dark blue solution formed

Split the contents of the second tube in two by pouring about half of its contents into a new test tube. Call these tubes "2a" and "2b."


Add a few drops of 1M hydrochloric acid to tube 2a, and a few drops of 1M ammonium chloride to tube 2b. Record your observations.
2a - blue solution turned colorless, white ppt insoluble in HCl
2b - blue solution turned colorless, white ppt insoluble in HCl

2006-09-30 06:09:49 · 2 answers · asked by Noel 4

Hi,
i did this experiment and when i calculated the formula or missing compund it doesnt seem right.
can you please help; i have listed the experiment, the given & found values, and what to find below.

Thank you in advance.
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Experiment:

In this experiment you will determine the equation of a redox reaction by the use of experimental data.

This is a reaction in which it is not obvious what products will be formed but by finding the relative number of moles reacting
you can deduce what reaction has occured.

The reaction is between bromate ions, BrO3(-) and hydroxylammonium ions NH3OH(+) in aqueous acid solution.
You assume that the bromate are converted to bromide ions, Br(-) (How can this reaction be shoed experimentally)

So the reaction that is being studied is:

BrO3(-) + NH3OH(+) ----> Br(-) + ?

2006-09-30 05:53:08 · 2 answers · asked by Anonymous

2006-09-30 05:46:44 · 3 answers · asked by kavitha g 1

Or was it Bohr's idea?

2006-09-30 05:25:23 · 11 answers · asked by shreyas 1

2006-09-30 05:17:13 · 19 answers · asked by Anonymous

K4Fe(CN)6 + KMnO4 + H2SO4 -> KHSO4 + Fe2(SO4)3 + MnSO4 + HNO3 + CO2 + H2O ......... al numbers are the small numbers after the element not the big number like 3SO but like H2O....... 1 before this was incorrect

2006-09-30 04:45:29 · 3 answers · asked by Anonymous

2006-09-30 04:35:54 · 3 answers · asked by Shruthi 1

2006-09-30 04:29:59 · 5 answers · asked by Mody 2

As the title
can anyone answer this question for me?

2006-09-30 03:31:07 · 1 answers · asked by I am myself 1

2006-09-30 03:13:53 · 16 answers · asked by Kenneth Koh 5

im not sure if it has to do with the element it contains or from ground state to excited state of an atom.

DONT TELL ME THE ANSWER IS ELECTRICITY.

2006-09-30 02:34:43 · 6 answers · asked by Anonymous

As such, Rutherford's atomic model was discarded bcoz he wasnt able to explain how electrons do not lose energy.Even Bohr's atomic model cannot explain exactly how they get energy to keep on revolving around nucleus. This question has been annoying me since a long time. I need quick and detailed answers to this question please.

2006-09-30 01:53:42 · 2 answers · asked by Urvashi B 1

2006-09-30 00:48:10 · 11 answers · asked by Anonymous

2006-09-30 00:30:38 · 19 answers · asked by Anonymous

2006-09-30 00:29:47 · 15 answers · asked by Anonymous

2006-09-30 00:11:53 · 16 answers · asked by Tony H 1

for complete oxidation, 1 mol of an organic compound requires 3 mol of oxygen gas. what could be the formula of the compound?
and
a polymer made from two different monomers is ?options are:-polthene, nylom, PCV, protein ?

2006-09-29 22:11:15 · 2 answers · asked by Doopy D 1

2006-09-29 22:10:38 · 2 answers · asked by mariano p 1

2006-09-29 20:59:59 · 2 answers · asked by parag k 1

I've heard you get carbon on pure state and heat it... then let it cold slow

2006-09-29 19:01:23 · 14 answers · asked by J C 1

2006-09-29 18:55:08 · 2 answers · asked by J C 1

2006-09-29 18:16:48 · 2 answers · asked by big papy 3

2006-09-29 17:41:58 · 2 answers · asked by Anurag S 2

1. calculate the work done when 1.0mol. of water at 100deg.cent. vapourises against an atmospheric pressure of 1 atm. Assume ideal behaviour and volume of liquid water to be negligible.
2. A gas is expanded from 300cubic cm to 500 against an average pressure of 760mm Hg At the same time 2J heat has been also supplied to the system. Calculate the change in internal energy.
3. Calclate the difference between heats of reaction at constant pressure and constant volume for the reaction at 25 deg.C in KJ
4.The heat of combustion of benzene at constant volume was found tobe 326.9KJ/mol. at 25deg.C. Calculate the heat of combustion of benzene in KJ at constant pressure.

2006-09-29 17:11:31 · 1 answers · asked by sunitha nkumar 1

y-axis is pH, x-axis is "Molar Equivalents." How do I get that value? I have the volume of 1 N of HCl and 1 N NaOH and the pH value of every 0.1 mL of HCl/NaOH that added to the unknown amino acid.

2006-09-29 17:01:13 · 2 answers · asked by Brian 3

2006-09-29 16:54:08 · 6 answers · asked by jani 1

and also the date and how it was discovered. thank u

2006-09-29 15:10:10 · 7 answers · asked by Anonymous

please help me. My homework is due monday.

2006-09-29 14:44:32 · 7 answers · asked by chsovi14 2

Will acidic foods cooked in a cast iron skillet become Fe (2+) enriched because of a reaction between the acidic food and the skillet?

Briefly Explain it to me...

THANKS

2006-09-29 14:13:26 · 2 answers · asked by Anonymous