Chemistry - April 2007

What is the formula of the coordination complex:
central metal ion: Cu+2
solution: CuSO4 + KSCN

2007-04-15 07:16:31 · 1 answers · asked by Roger 1

the calorimeter rises from 20.02 degrees C to 25.36 degree C. Calculate the heat of combustion reaction (qrxn) in KJ

2007-04-15 06:58:54 · 3 answers · asked by Anonymous

combustion of 1.7 L of this mixture? Assume ideal gas behavior and that products of the cobustion are CO2(g) and H2O(l)

2007-04-15 06:44:23 · 2 answers · asked by Anonymous

A chemist claims to have found a complex ion where the most intensely absorbed light is 371.0 nm. Estimate the crystal field splitting energy for this ion in kJ/mol.

2007-04-15 06:17:01 · 1 answers · asked by woj87marta 1

A saturated solution of ammonium nitrate, NH4NO3, in methanol, CH3OH, contains 3.42 g of NH4NO3 in 20.0 mL of methanol at 20 C. The density of methanol at this temperature is 0.7914 g/ mL. Calculate the solubility of NH4NO3 in methanol in units of g solute/ (100 g sovent).

2007-04-15 05:56:53 · 1 answers · asked by Alan l 1

I added sodium bicarbonate to hot water. It bubbled for a while. Then I hooked it up to a battery with copper electrodes. After a few minutes the solution was bright blue. I was able to easily electroplate several items with copper in this solution. What is it?

2007-04-15 05:55:43 · 1 answers · asked by pirate77 2

How do I solve this I can not find the formula?

2007-04-15 05:42:48 · 3 answers · asked by Carolyn O 1

Also got this wrong in the quiz. What's the inoic equation for the reaction at the cathode? The ions in the solution are: Cu[+2], SO4[-2], H[+], OH[-] all aqueous. I put 2H+ + 2 electrons gives us H2.

2007-04-15 05:28:07 · 1 answers · asked by Avatar Unknown 2

MnCO3 is manganese carbonate

2007-04-15 05:02:54 · 1 answers · asked by chincou 1

how much foam will form?
how long will it take until something happens?

2007-04-15 04:59:19 · 3 answers · asked by crazy&lazy 5

Calculate the pH these solutions:
HOC6H5
and
HCN

i have no idea what to do!! thanks!

2007-04-15 04:44:56 · 1 answers · asked by sandcastlesinair 1

2007-04-15 04:35:02 · 4 answers · asked by chincou 1

does it have anything to do with the arrangement of the covalent and hydrogen bonds in a way to minimise repulsion?

2007-04-15 03:17:33 · 3 answers · asked by Anonymous

hi i need some help
i need a chemical equation for 2methylpropan-2-ol reacting with ZnCl2 in concentrated HCl

thank you

2007-04-15 01:57:42 · 1 answers · asked by sweetflower 1

What is it composed of?

2007-04-15 01:48:33 · 8 answers · asked by Anonymous

What is the E°cell for the cell represented by the combination of the following half-reactions?
ClO4-(aq) + 8H+(aq) + 8e- ↔ Cl-(aq) + 4H2O(l) E° = 1.389 V
VO2+(aq) + 2H+(aq) + e- ↔ VO+(aq) + H2O(l) E° = 0.991 V
-0.398 V
-2.380 V
0.398 V
2.380 V
none of the above

is it 2.380v correct.


The value of E°cell for the reaction
2Cr3+(aq) + 6Hg(l) → 2Cr(s) + 3Hg22+(aq)
is 1.59 V. Calculate ΔG° for the reaction.
-921 kJ
-767 kJ
-460 kJ
-307 kJ
none of the above

is -921Kj correct
plz confirm my answer

2007-04-15 01:42:23 · 1 answers · asked by jennifer 2

hi is this the correct equation for the reaction with Butan-1-ol with [o] acidified K2Cr2O7 ??

CH3CH2C2OH + [o] -> CH3C-C(=O)CH + H2O

thank you.

2007-04-15 00:07:04 · 4 answers · asked by sweetflower 1

2007-04-15 00:05:37 · 3 answers · asked by Puppy Zwolle 7

I found 2 experiments for the reaction I need but I’m not sure which 1 is right, so could some1 please say which one is the better answer thank you................................1!!


1.

CH3CH2Br + NaOH (C2H5OH) -> CH3CH2OH + NaBr

The effect of the SodiumHydroxide(dissolved in ethanol) on the OHˉ now behaves as a base, a proton acceptor. The CH3CH2Br behaves differently from an alkane, as it is a polar molecule as it contains + C-Br ˉ as bromine is more electronegative than carbon. So because of the inductive effect (pull of the electron cloud towards the positive charge) the H’s become + as well – an elimination reaction.

NaBr + AgNOз -> AgBr + NaNOз

This will form a cream precipitate




2.
CH3CH2Br + H20 ->+ H + + Brˉ
Silver ions (from the AgNO3) the react with the Brˉ ions giving a precipitate of silver bromide
Ag+(aq) + Brˉ (aq) -> AgBr(s) this precipitate will turn cream

2007-04-14 23:54:06 · 1 answers · asked by sweetflower 1

I'm in year 11, studying this subject and I'm gonna fail because I just don't get it..What the hell is schrodinger talking about S, p d subshells and how to fill...Can someone explain this to me in laymen's language...I would really appreciate it ta

2007-04-14 21:45:56 · 2 answers · asked by shauna_khairulazhar 3

NH4NO3 + HCl-->

i think it makes nitric acid?? facts plz

2007-04-14 21:07:06 · 6 answers · asked by Me + Me = BANG! 2

2007-04-14 20:59:18 · 4 answers · asked by Samie 2

what about a piece of copper metal into 6M HCl acid?

In a separate experiment, concentrated nitric acid is added to a test tube containing a piece of copper metal.

Describe what you would see. explain differences between the results obtained in this experiment and the one from the copper metal in HCl.

2007-04-14 20:51:01 · 5 answers · asked by epikhigh121 1

CS2(g)+3Cl2(g)-->S2Cl2(g)CCl4(g) delta H=-230 KJ/mol

2007-04-14 20:50:21 · 2 answers · asked by Anonymous

calorimeter containing 30 g of water, the temp rose form 23.76 degrees C to 29.38 degrees C. Calculate the specific heat of the metal

2007-04-14 20:46:36 · 4 answers · asked by Anonymous

2007-04-14 20:38:06 · 3 answers · asked by Anonymous

2007-04-14 20:27:51 · 12 answers · asked by Jose 1

a chemist claims to have found a complex ion where the most intensely abosrbed light is 414.0nm. Estimate the crystal field splitting energy for this ion in kJ/mol.

2007-04-14 20:23:05 · 2 answers · asked by Anonymous

2007-04-14 20:20:49 · 2 answers · asked by arpita m 2

Estimate the crystal field splitting energy for this ion in kJ/mol.

2007-04-14 20:18:23 · 1 answers · asked by Anonymous