Chemistry - September 2006

2006-09-24 20:50:49 · 1 answers · asked by megan k 2

I'm just so confused with the whole reduction and oxidation stuff and the reducing agent and oxidizing agent also. Can anyone explain how to figure them out as simple as they can??

theyre very confusing!

2006-09-24 20:43:38 · 4 answers · asked by sam_c5230 2

In which of the following gas-phase equilibria is the yield of products increased by increasing the total pressure on the reaction mixture?

a) CO(g) + H2O(g) CO2(g) + H2(g)
b) 2NO(g) + Cl2(g) 2NOCl(g)
c) 2SO3(g) 2SO2(g) + O2(g)
d) PCl5(g) PCl3(g) + Cl2(g)

2006-09-24 20:10:11 · 2 answers · asked by hmmm 2

2006-09-24 20:06:05 · 10 answers · asked by Anonymous

the volume of each glass is 250 ml. how much heat, in kJ, does the body have to supply to maintain the temperature at 37 deg C?

2006-09-24 19:14:06 · 4 answers · asked by Anonymous

2006-09-24 18:44:54 · 4 answers · asked by itsaloni 1

2006-09-24 18:35:41 · 7 answers · asked by itsaloni 1

I really need to know how to do this question:

What number of moles of O2 is needed to produce 14.2 grams of P4O10 from P? (Molecular wight P4O10 = 284 g

2006-09-24 18:16:29 · 3 answers · asked by kruzzz80 2

2006-09-24 18:14:07 · 10 answers · asked by Panda 3

Statement: When 2.0 ml of 1.50-M Ammonium Phosphate is mixed with 1.000 ml of .750-M Ferrous Acetate, a precipitate forms.

Question: Calculate the theoretical yield (in grams) of the precipitate and identify the limiting reactant.

Please help!! I've been stuck on this for so long.

2006-09-24 18:11:49 · 3 answers · asked by Lily126 2

2006-09-24 18:04:34 · 10 answers · asked by itsaloni 1

2006-09-24 18:00:11 · 11 answers · asked by itsaloni 1

for chemistry

2006-09-24 17:46:07 · 1 answers · asked by mtphant3 2

I get confused when the there is a subscript...example:

Cu + AgNO3 = Cu(NO3)2 + Ag

how in the world do you solve this to balance it? (note: the 3's and the 2 are subscripts)

My question is, can you split up the elements in the equation..to balance it?

2006-09-24 17:45:45 · 6 answers · asked by raycin4855 2

explain the reason.

what kind of bonds are present between the atoms of the elements. explain by giving some examples.

plz plz help me. I will be thankful to u all

2006-09-24 17:34:58 · 14 answers · asked by behroz_ahmedali 2

1. MnO-4 (aq) + S2O3(aq) => Mn (aq) + SO4 (aq) in acidic solution

2006-09-24 17:30:34 · 3 answers · asked by xoxo_jenn_24 2

Carbon dioxide.
CO2

If carbon has +4 charge
and oxygen has -2 charge
(I hope they are)

they are BALANCED right?
then, why do you put prefixes in there?

2006-09-24 17:28:13 · 5 answers · asked by gogogo 3

What is the molarity of HCL in the fluid? Assume all of the acidity is due to HCL

2006-09-24 17:20:39 · 1 answers · asked by xoxo_jenn_24 2

its -3 right?

2006-09-24 17:16:27 · 3 answers · asked by gogogo 3

A groundwater contains 1.8 mg/L of iron as Fe 3+. What pH is required to precipitate all but 0.30 mg/L of the iron at 25 C?

2006-09-24 17:11:16 · 2 answers · asked by HH 1

like - PCl3

They both have negative charge. So you have to put the prefixes instead of balancing them right?

2006-09-24 17:11:09 · 2 answers · asked by gogogo 3

does it have something to do with density?

2006-09-24 17:10:13 · 4 answers · asked by skippn_star 2

Consider the reaction N2(g) + O2(g) 2NO(g), for which Kc = 0.10 at 2,000ºC. Starting with initial concentrations of 0.040 M N2 and 0.040 M O2, determine the equilibrium concentration of NO.

a) 5.4 × 10–3 M
b) 0.0096 M
c) 0.011 M
d) 0.080 M
e) 0.10 M

okay I keep getting 0.013 which isnt even on here, maybe im doing a significant digit error, and its C?

I set the problem up like this [NO]^2/[N2][O2]=.10

I know N2 and O2 are .040 so multiply .040 with .040 = .0016, multiple .0016 with .10 to get rid fo the denominator so the problem is now. [NO]^2 = .00016 take the square of both sides to get the concentration of NO = 0.0126 = 0.013 M??

2006-09-24 17:05:05 · 2 answers · asked by hmmm 2

It's K2O.

K has a charge of +1
O has a charge of -2

The answer is potassium oxide right? (since one of them is positive and the other negative)

----------------------
SO THIS IS MY QUESTION:

then P Cl3

P has a charge of -3
Cl has a charge of -1

is the answer
#1 - phosphorous trichloride?
#2 - phosphorous chloride?

I got #1...

But my teacher's answer key said #2. Why?
(There were no prefixes for NEGATIVE balanced compounds. is this allowed?)

2006-09-24 16:52:45 · 4 answers · asked by gogogo 3

My first question is figure out moles and atoms. Just give me the basic information about how to figure out questions that pertain to moles, atoms, and molar mass.
My second question is can you give me a list on how to go grom cm to meter to km, etc and ml to liters, etc

2006-09-24 16:50:58 · 6 answers · asked by clementine576 2

1.899x10exp-4 mol of an unidentified gaseous substance effusesthrough a tiny hole in 81.1s. Under identical conditions, 1.664x10exp-4 mol of argon gas takes 88.5s to effuse.

2006-09-24 16:50:15 · 2 answers · asked by Brain P 1

Zn+HCl----->N2 + H2O

2006-09-24 16:46:04 · 5 answers · asked by Anonymous

2006-09-24 16:39:23 · 9 answers · asked by shy_vi3t_gur1 2

i am doing a lab for chemistry and the question is "cooking involves both physical and chemical changes. give examples that support this statement." I can't think of anything that is a chemical change...i know its probably really easyy...but i really need help!

2006-09-24 16:25:19 · 14 answers · asked by Quechyyy 2

2006-09-24 16:11:50 · 5 answers · asked by Kailyn N 1