Chemistry - March 2007

2007-03-26 11:42:20 · 1 answers · asked by frank 2

C2H5OH--->(acidified,KMnO4, heat)X-->(q)CH3COONa+H2O
|
|(C2H5OHconc.H2SO4)
E+H2O


The line going down should be from X and the H2SO4 is warm. What are the homologous series to which X and E belong? How would you seperate E from a mixture of X and E?

2007-03-26 11:34:28 · 3 answers · asked by deadly_plague101 1

health

2007-03-26 11:30:10 · 4 answers · asked by Anonymous

Where both NH4Cl and NH2Cl dissolve in water, but whereas aqueous NH4Cl conducts electricity and the aqueous NH2Cl does not.

2007-03-26 11:26:04 · 1 answers · asked by deadly_plague101 1

2007-03-26 11:17:45 · 3 answers · asked by joserrr2000 1

a) HNO3


b) Na


c) Fe


d) Cr


e) C

2007-03-26 11:01:51 · 2 answers · asked by Anonymous

2007-03-26 10:56:46 · 2 answers · asked by joserrr2000 1

2007-03-26 10:40:46 · 1 answers · asked by adalin 1

How do you predict reactions? Like this:

Potassium phosphate and magnesium nitrate solutions are mixed.

I know what type of reactions there are and stuff, but do you do H O N Cl Br I F? And do you cross the charges in both the products and the reactants? Help!

2007-03-26 10:38:48 · 2 answers · asked by Anonymous

I have to do a science project for school and I'm researching the element Uranium. The project is to make a promotional poster for useage of your element, but I don't want to write stuff about nuclear bombs. I know you can use Uranium for nuclear energy but I wasn't sure if it was better than using petroleum. Please included a list of Uranium's other uses too if you can. Thanks!

2007-03-26 10:23:53 · 6 answers · asked by gotriceazn101 2

water is amphoteric meaning it can function as an acid or base in chemical reactions. Identify the role of water as an acid or base in the reactions.
NH2 + H20---->NH3 + OH- (acid)-but why?
HOCl + H20--->H3O + OCl- (base)- but why?
i dont understand

2007-03-26 10:11:49 · 2 answers · asked by Jacquline M 1

2007-03-26 10:07:55 · 6 answers · asked by Anonymous

2007-03-26 10:01:36 · 2 answers · asked by Anonymous

2007-03-26 09:59:29 · 4 answers · asked by shortydidi03 2

1) We have a mixture of: NaCl(s) and C12H22O11(s).
2) 15.0g of this mixture is dissolved in enough water to form 500mL of solution.
3) The osmotic pressure of this solution is 6.41atm and 25°C

With this information, I need to know the weight % of NaCl.

I did this (see below) and my teacher told me that I needed to consider that the NaCl dissociates in water. What should I fix? Thank you.

****
Osmotic Pressure=Pi M=Molarity R=Constant T=Temperature
Pi=MRT
M=Pi/RT
M=6.41atm/(0.082)(298.15K) = 0.262 M

0.262 M= 0.262 moles mixture / 1 L of solution
We have .5 L of solution, so we have 0.131 moles mixutre

Equation
x g NaCl * (mol NaCl/58.5g NaCl) + (15-x)g C12H22O11 *(mol C12H22O11/342g) = 0.131 mol

NaCl=x=6.15g
C12H22O11=15-x=8.85g

But I didn't consider that NaCl is dissociated.
Thanks for your answer.

2007-03-26 09:59:12 · 1 answers · asked by robert 2

2007-03-26 09:53:58 · 2 answers · asked by Hunt 1

does it have something to do with crystal lattice energy and hydration energy?

2007-03-26 09:43:08 · 2 answers · asked by Anonymous

1) Hydrocloric Acid (HCl) + Magnesium metal (Mg2)

2) Hydrocloric acid (HCl) + Copper Wire (Cu2)

3) Hydrocloric acid (HCl) + Zinc Metal (Zn)

4) Hydrocloric Acid (HCl) + Calcium Carbonate (CaCo2)

2007-03-26 09:40:25 · 2 answers · asked by ♥♫♥ÇHÅTHÜ®ÏKÃ♥♫♥ 5

four moles of carbon monoxide gas occupy a volume of 3.9 liters at a constant temperature and pressure. What volume would 1.75 moles of the gas occupy?

2007-03-26 09:37:13 · 3 answers · asked by Jacquline M 1

Na2SO3 + HCl --> ???
Na2CO3 + HCl --> ???
Ca + H2O --> ???
please answer as soon as possible please

2007-03-26 09:37:03 · 2 answers · asked by cannon_primed 4

In this question: In a titration experiment 50 mL of a 0.1 M HCl solution neutralized a 0.2M Al(OH)3 solution - how many mL of the hydroxide solution were used, I am expected to figure out that I need 3 HCl, in order to make the formula:
Al(OH)3 + 3 HCl How do I know I need 3 HCl?

Thanks!

2007-03-26 09:36:21 · 3 answers · asked by LearnChem 1

To a separatory funnel with two layers--the nonpolar diethyl ether and the polar water--is added a small amount of solid. After shaking the separatory funnel, in which layer will you find each of the following solids?
a. NaCl- middle
b. camphor,(C10H16O)- very top
c. KOH- bottom

2007-03-26 09:34:18 · 2 answers · asked by chelsea_cruz20 1

Is hydrate also multipied by 5?

2007-03-26 09:30:32 · 2 answers · asked by Anonymous

2007-03-26 09:23:49 · 7 answers · asked by Anonymous

Calculate the solubility in grams per liter (note that Ksp is in terms of moles and liters) of Hg2Cl2
Ksp = 1.10 x 10−18

Hg2Cl2(aq) ---> Hg22+ + 2Cl−



.. i need help with this asap, im very lost ! someone please help

2007-03-26 09:17:10 · 2 answers · asked by Jessica 1

1. NO2-
2.N3-
3.SO3
4.ClO3-
5.CCl4

please help, I am pretty sure that ClO3 is polar and CCl4 is nonpolar, but I'm not sure really how to figure it out, please help!!

2007-03-26 09:14:53 · 1 answers · asked by Domino 1

The concentration of stomach acid, HCL, is approximately 0.10 M. What volume of stomach acid contains 0.25 mg HCL?
My answer is 0.000192 L
Is it right?Help pls.

2007-03-26 09:06:38 · 6 answers · asked by chelsea_cruz20 1

For MgCl2

and Na2SO4

2007-03-26 08:49:06 · 3 answers · asked by Yup 1

2007-03-26 08:41:20 · 7 answers · asked by kristen m 1

2007-03-26 08:37:43 · 2 answers · asked by estkijedsco 4