Chemistry - March 2007

Please help me! :)

2007-03-26 13:47:23 · 3 answers · asked by silver 2

Balance the following equation by the half-reaction method in an acidic or basic solution as indicated.


Cr2O72- + C2H5OH --> Cr3+ + CO2 ( acidic )


You must enter the correct coefficients of the above reactants and products as a single group of integers.


Example:

C2H5OH(aq) + Cr2O72-(aq) --> CH3CO2H(aq) + Cr3+(aq)



the balanced equation is

3C2H5OH(aq) + 2Cr2O72-(aq) + 16H3O+(aq) --> 3CH3CO2H(aq) + 4Cr3+(aq) + 27H2O(l)



you would enter 3234 for an answer.

2007-03-26 13:40:37 · 1 answers · asked by Bryant M. 4

Hi.

I need to come up with a project for my chemistry class. I'm looking for some good ideas, on topics that would be easy to research + full of information and interesting.

I would like it to be a written paper, on one topic, like last time i wrote a paper on Weapons Of mass distruction. How they are made and what not..

Best idea will recive 10 points.

Thanks.

2007-03-26 13:34:07 · 2 answers · asked by T 3

i tried many different methods.. but I couldnt get the correct answer... can anyone show me step by step ..thanks??

2007-03-26 13:32:08 · 2 answers · asked by im_a_goofy_chick 2

Here is the fill question:

In an attempt to maximize the yield of methanol (amount of methanol produced), a chemist would try to shift the equilibrium as far to the right as possible. Which of the following would accomplish this?

a. heating the mixture
b. adding an excess of carbon monoxide
c. removing the methanol as it is formed
d. adding a substance that reacts with carbon monoxide


Thanks in dvance for the help you guys!

It's really appreaciated!

<3!!
Toodles!

2007-03-26 13:31:42 · 1 answers · asked by calculushelp1990 1

help balance the following:
3)___K + ____B2O3 ---> K2O + __B

4) __HCl +___ NaOH ---> NaCl + ___H2O

5)___Na + ___NaNO3 ---> ___Na2O + ___N2

6) ____C + ____S8 ---> _____CS2

2007-03-26 13:29:46 · 2 answers · asked by Anonymous

Heat capacity is defined as the quantity of heat required to raise the temperature of a body by one degree Celsius. Does a negative heat capacity make sense?

2007-03-26 13:25:02 · 3 answers · asked by Alan l 1

ok i need to know the electron configuratIon for:
-nitrogen
-titanium
-silver
-and uranium!!!!!!!

please please please answer. i need this by tonight. thhnxxxxx♥

2007-03-26 13:20:07 · 5 answers · asked by Anonymous

So the results conclude that when you add heat, the reaction speeds up because the particles speed up and more collisions occur to start the reaction. What is the significance of the results, and What is an example of a real-life situation? [I cannot use the refrigeration example]

2007-03-26 13:13:54 · 1 answers · asked by Romaniangirl10 2

2007-03-26 13:08:15 · 1 answers · asked by lea 2

okay these are multiple choice. Please answer any that you know for sure. if you are just guessing or can narrow any of the answers out please let me know...

1)Of the following, an aqeuous solution of ______will form basic solutions. (could possiblie be more than one of these)
a-NH4Cl
b-Cu(NO3)2
c-K2CO3
d-NaF

2) A 0.1M solution of ______has a pH of 7.00
A-Na2S
B-KF
C-NaNO3
D-NH4Cl
E-NaF

3) an aqueous solution of _____would be a basic solution.
A-NH4ClO4
B-KBr
C-NaCl
D-NaHSO4
E-Na2SO4

4)Of the following the acid of ______is the greatest.
a- CH3COOH
b-ClCH2COOH
c-Cl2CHCOOH
d-Cl3CCOOH
e- BrCH2COOH

5)a 0.1M solution of the sodium salt of which of the following anions will have the hightest pH.
A-IO2 -1
B-ClO2 -1
C-ClO -1
D-IO-1
E-IO3 -1

6)Which is a lewis base?
a Cl-
b BF3
c CN-
d H2O

7)hydrofluoric acid and____produce a buffur solution.
a HCl
b NaNO3
c NaF
d NaCl
e NaBr

2007-03-26 13:07:29 · 2 answers · asked by XoswimXo 1

How many grams of copper would be produced if 456g of iron were reacted?

(would i need to do any work at all? since Iron and Copper are 1:1 ratio...)

2007-03-26 13:02:47 · 3 answers · asked by no name 1

i need help, what causes some solids to be made of crystals? 3 examples...

2007-03-26 13:01:51 · 1 answers · asked by griffinkids2000 1

What about oxygen

2007-03-26 13:00:42 · 2 answers · asked by Anonymous

I was given an assignment on oxygen, and there are a few questions i dont know how to answer. Please help me! Thanks alot. :
What are its properties?
How did it get its name?
When was it discovered? Where? By whom?
How common is it on Earth? In the universe?
What is it used for? is it valuable?
What industries use it?
Is it dangerous?
List 5 coumpounds

2007-03-26 12:59:15 · 2 answers · asked by Yuri Ebihara 2

In a tritation of NHO3,your add a few drops of phenolphthalein indicator to 50.00 mL of acid in a flask. you quickly add 20.00 mL of 0.0502 M NaOH bu overshoot the end point and the solution turns deep pink. instead of staring over, you add 30.00 mL of the acid, and the solution turns colorless. Then, it takes 3.27 mL of the NaOH to reach the end point. what is the concentration of the HNO3?

2007-03-26 12:58:18 · 1 answers · asked by carla 2

If adding a 0.552g sample of metal x to 150 ml of 1.0 M HCl caused a temperature increase of 7.33 degrees celsius, calculate the quantity of heat thas flowed.

2007-03-26 12:55:02 · 1 answers · asked by M M 2

What metal would not tarnish or rust? I have a couple of necklace chains that neither tarnish nor rust but I don't know what material they are made from. I know sterling silver/silver tarnish.

Anybody know?

2007-03-26 12:44:09 · 10 answers · asked by Lily M 2

given the specific heat capacity of solid H2O (water) is 2.02 J/(gramsxCelsius)

other values of enthalpy may be needed...?

thank you so much! :)

2007-03-26 12:43:57 · 2 answers · asked by Anonymous

please help me balance the following equation *step by step*
___H3PO4 + ___KOH ---> ___K3PO4 +___H2O

2007-03-26 12:37:43 · 4 answers · asked by Anonymous

Suggest a reason why 2-methyl-1-propanol is more soluble in water than 1-butanol.
Does it have to do with hydrogen bonding?

2007-03-26 12:34:50 · 2 answers · asked by Kristin H 1

2007-03-26 12:29:20 · 2 answers · asked by shortydidi03 2

2007-03-26 12:27:32 · 1 answers · asked by Dollar 1

sodium citrate + hydrochloric acid = sodium chloride + water + carbon dioxide?

or Na(3)C(6)H(5)O(7) + HCl = NaCl + H(2)O + CO(2)? (if that is the formula for sodium citrate..)

Thanks!!!

2007-03-26 12:19:35 · 3 answers · asked by Anonymous

If 50. Joules of heat is applied to 10.G of iron, by how much will the temperature of the iron increase?

2007-03-26 12:19:22 · 2 answers · asked by Joseph V 1

2007-03-26 12:13:21 · 2 answers · asked by lex 1

What would be the pattern in the boiling points for group 15 hydrogen compounds because there's NH3 with -33, and PH3 with -87, AsH3 with -55, and SbH3 with -17? Would it have anything to do with London forces or is it something else?

2007-03-26 12:10:08 · 1 answers · asked by glance 3

I have recently had to test 6 unknown compounds to identify their functional group. I need to know why alchols and aldehydes would decolourise bromine water? I thought it would identify the Alkenes without any false tests can anyone shed any light, apparently it may be to do with haloalkanes???

2007-03-26 12:07:22 · 3 answers · asked by Anonymous

Explain why the colligative properties may not apply to solutions containing volatile solutes.

2007-03-26 11:48:12 · 1 answers · asked by Theo Z 2

i am also confused on net ionic equations...if anyone could help me i would REALLY REALLY appriciate it!!! :D

2007-03-26 11:44:34 · 2 answers · asked by little4ever_13 1