Chemistry - April 2007

The following reaction


CH3CH2CBr2COOH + NH2CH2CH3

produces water and what other product ?



a) CH3CH2CBr2CONHCH2CH3


b) CH3CCl2CONHCH2CH3


c) CBr3CH2CH2CONHCH2CH3


d) CCl3CH2CONHCH2CH3


e) CH3CBr2CONHCH2CH3


f) CH3CBr2CH2CONHCH2CH3

2007-04-25 10:51:12 · 3 answers · asked by ashleyjohn18 1

2007-04-25 10:48:40 · 1 answers · asked by Clarence Thomas 1

Half Cell Reactions ``Standard Electrode Potentials (volts)
K <-> K+ + e- ````````````````+2.92
Ca <-> Ca++ + 2e- ``````````+2.87
Mg <-> Mg++ + 2e- `````````+2.34
Zn <-> Zn++ + 2e- ````````````.762
Cu <-> Cu++ + 2e- `````````-.344
Ag <-> Ag+ + e- `````````````-.7995
Pt <-> Pt++ + 2e- `````````````-1.2

The Choices:

A. Calcium and Silver
B. Copper and Zinc
C. Magnesium and Platinum
D. Potassium and Silver
E. Zinc and Silver

Please let me know why thats the answer.

2007-04-25 10:46:21 · 1 answers · asked by Clarence Thomas 1

ANYONE PLEASE ASAP!? =]

2007-04-25 10:40:19 · 3 answers · asked by Anonymous

2007-04-25 10:39:51 · 5 answers · asked by Celia 4

elimination of atoms or groups from two adjacent carbons.Outline the preparation of 3-methyl pentyne

2007-04-25 10:37:15 · 1 answers · asked by tq 3

I do not understand how to do the following problem:

Nitrogen dioxide reacts with water to produce oxygen and ammonia.

4NO2(g) + 6H2O (g) → 7O2(g) + 4NH3(g)

At a temperature of 415°C and a pressure of 725 mmHg, how many grams of NH3 can be produced when 4.00 L NO2 react?

Answer bank:
a.1.25 g NH3
b.1.15 g NH3
c.6.51 g NH3
d.0.0676 g NH3
e.2.15 g NH3
f.1.91 g NH3
g.2.64 g NH3


I asked this question eairlier and someone answered:
"1) Calculate the # of moles NO2 that are in 4 L of gas.
2) The # of moles NO2 will equal the # of moles NH3 produced.
3) Convert the moles to grams and you will have your answer."

However, I do not not know how to calculate the number of moles of NO2 that are in 4 L of gas. Can someone please explain how to do this, or provide the answer. THANKS VERY MUCH.

2007-04-25 10:37:10 · 2 answers · asked by Anonymous

What is an example of an element, compound, mixture that is a household item? and is aluminum foil a element?

2007-04-25 10:13:17 · 4 answers · asked by Anonymous

I've already tried to snap it, but it doesnt do anything, and I've shaken the stupid glowstick untill I nearly wore myself out. Are there any other ways to get it to work, or should I throw it out?

2007-04-25 09:55:14 · 4 answers · asked by diamonds_are_forever<3 3

KCl(aq)
CH3OH(aq)
Ba(OH)2(aq)
CH3COOH(aq)

Which solutions contain electrolytes (can be more than one)

2007-04-25 09:51:39 · 3 answers · asked by staci3925 s 1

chlorine and bromine

potassium and helium

2007-04-25 09:47:39 · 3 answers · asked by Alex T 1

2007-04-25 09:42:44 · 14 answers · asked by Brittany H 1

And if polyisobutylene is the main ingredient, what else is it used for? Car tyres?

2007-04-25 09:36:32 · 9 answers · asked by Toronto 1

2007-04-25 09:28:23 · 1 answers · asked by galdon885 1

ok I have no formal secondary edu but i want to gain some knowledge on bio chem can anyrecmond a good read that is in broad terms on the subject?

2007-04-25 09:16:35 · 1 answers · asked by Anonymous

I have a 30 mL solution of PBS at a pH of 7.40 open to atmosphere (at 25C). I bubble 5% CO2 through a tube until the pH stabalizes to 6.48. Does anybody know the Ka value of adding a weak acid (ie CO2) to a buffered system? How would I incorporate the Henderson-Hasselbalch equation to find changes in CO2 concentration over time with one known (pH)?

2007-04-25 09:09:42 · 2 answers · asked by Mike W 1

Can anyone explain what happened in this lab? I'm totally confused about the results.

So we did a lab in class today where we collected three test tubes of ethyne gas. One tube was full, one was half full of ethyne gas, and one tube with 1 cm of gas.

We collected the gas by reacting CaC2 in water to collect the ethyne gas, meaning that nothing else should be in the test tubes except for the gas.

When we held a flame near mouth of the FULL tube, there was a small pop and a little bit of residue near the top of the test tube, meaning that it was incomplete combustion.

The half-full tube resulted in ALOT of residue, meaning alot of incomplete combustion.

The 1 cm tube resulted in a very loud pop and no residue (complete combustion).

I was assured that the results are correct, but I can't figure out why the half-full tube left alot of residue, yet the full tube only left a little bit of residue.

Also, how would I write the combustion equations for the half tube and full tube?

2007-04-25 08:56:09 · 2 answers · asked by Dave H 2

I'm trying to obtain a whiter process for taxidermy purposes.

2007-04-25 08:49:25 · 2 answers · asked by joczr2 1

please bring the links

2007-04-25 08:40:20 · 2 answers · asked by Sali 3

For the equilibrium situation involving acetic acid,
CH3COOH(aq) + H2O (l) <==> CH3COO^- (aq) + H3O ^+ (aq)
Explain the equilibrium shift occurring for the following changes:
a) A strong base is added to the solution
b) More acetic acid is added to the solution.

2007-04-25 08:34:09 · 2 answers · asked by cylo1818 3

If an acid does not contain oxygen, the name of the acid begins with which of the following prefixes?
anoxy-
peroxy-
hydro-
mono-


If an acid does not contain oxygen, the name of the acid ends with which of the following suffixes?
-ous
-ic
-ine
-ate

2007-04-25 08:33:39 · 2 answers · asked by Nanda 2

Tungsten is usually produced by the reduction of WO3 with hydrogen.
WO3(s) + 3 H2(g) W(s) + 3 H2O(g)

Consider the following data.

WO3(s) H2O(g)
H°f (kJ/mol) -839.9 -241.8
G°f (kJ/mol) -763.1 -228.6


(a) Is K > 1 or <1 at 25°C?
K < 1
K > 1
Explain your answer.

(b) What is the value of S° at 25°C?
J/K
(c) What is the temperature at which G° equals zero for this reaction at 1 atm pressure?
K
(d) What is the driving force of this reaction?

2007-04-25 08:25:14 · 2 answers · asked by l_walker2005 1

i just want to make sure i have the right answers!!

so we used Rolaids: $3.58, and 150 tablets.

25 ml of HCl used
1.475grams is the mass of tablets
2.3 ml of NaOH used
Molarity of NaOH 1.02

1) Moles of base used (M NaOH X L NaOH).
2) Moles of acid Neutralized by NaOH (I think that it is the same as #1, not sure?)
3)Moles of acid Neutralized question 4-question3?
4)moles of acid Neutralized per gram of tablet?
5) mole of acid neutralized per dollar?

2007-04-25 08:22:44 · 2 answers · asked by cowgirlemmy172 2

2007-04-25 08:17:15 · 6 answers · asked by Puntu Babu 1

how many disintegrations have occurred after 20 minutes?

2007-04-25 08:15:00 · 1 answers · asked by Anonymous

A solution of 25 mL of HCL, unknown concentration, is titrated to its equivalence point with 41mL of 1.50 M NaOH. What is the concentration of the acid?

2007-04-25 08:10:34 · 2 answers · asked by cylo1818 3

complete and balance the reaction

2007-04-25 07:49:32 · 1 answers · asked by cait 2

2007-04-25 07:49:29 · 2 answers · asked by Yuki 1

a. complete and balance the reaction
b. identify the precipitate
c. explain how you identified the precipitate

2007-04-25 07:47:29 · 2 answers · asked by cait 2

Calculate the density, in g/L, of N2(g) at 715 torr and 98 °C.

2007-04-25 07:03:14 · 3 answers · asked by Anonymous