Chemistry - October 2006

All three of them.
last one is monohydrogen phosphate i think

2006-10-29 12:11:51 · 2 answers · asked by Th_hT 1

2006-10-29 12:08:47 · 2 answers · asked by Lily 1

2006-10-29 11:52:45 · 4 answers · asked by dorkified at heart 1

2006-10-29 11:47:06 · 4 answers · asked by dorkified at heart 1

I need to find an experiment that can determine the gas constant R. Possible materials include: 50 mL gas buret (eudiometer ), 400 mL beaker, millimeter ruler. 6M HCl, Mg ribbon (between 0.025 and 0.035 g). This is a high school experiment. Any help is appreciated. Procedures needed.

2006-10-29 11:22:02 · 2 answers · asked by JeX 1

what is the formula for copper (I) hypophosphite
ammonium acetate
potassium chlorate
clacium hypophosphate

2006-10-29 11:08:07 · 2 answers · asked by Anonymous

C6H12O6 -->2C2H5OH+2CO2 A 1.00-mole sample of C6H12O6 was placed in a vat with 100g of yeast. If 32.5 grams of C2H5OH was obtained, what was the percent yield of C2H5OH?

2006-10-29 11:04:34 · 2 answers · asked by chalupa1769 2

2006-10-29 11:03:09 · 3 answers · asked by P6890T 1

2006-10-29 11:00:30 · 3 answers · asked by tommy 1

Please help me. I am at my wits end on how to answer this question.
Thanks in advance.

2006-10-29 10:47:16 · 1 answers · asked by Anonymous

2006-10-29 10:43:19 · 4 answers · asked by P6890T 1

between ionic and molecular compounds? I can't find it in my notes and I can't find the definition I'm looking for on the internet. Also, how can you tell the difference just by looking at the formula? Ex: LiBr
Thanks!

2006-10-29 10:40:01 · 2 answers · asked by Anonymous

Although I struggled with maths, probably because I didn't like my Maths teacher. I loved Physics, Chemistry and Biology. They were taught separately when I was at school. Chemistry was my favourite.

2006-10-29 10:33:07 · 8 answers · asked by Anonymous

2006-10-29 10:29:51 · 3 answers · asked by Anonymous

Phosphorus trichloride gas and chlorine gas react to form phosphorus pentachloride gas.
PCl3(g) + Cl2(g) PCl5(g)

A gas vessel is charged with a mixture of PCl3(g) and Cl2(g), which is allowed to equilibriate at 450 K. At equilibrium the partial pressures of the three gases are PPCl3 = 0.124 atm, PCl2 = 0.157 atm, and PPCl5 = 1.30 atm.
(a) What is the value of Keq at this temperature?

2006-10-29 10:28:46 · 3 answers · asked by Anonymous

2006-10-29 10:25:55 · 3 answers · asked by Catherine D 1

Calculate the standard enthalpy of formation of gaseous diborane.( B2H6) given the following data.

4B(s) + 3O (g)----> 2B2O3 (s) H= -2509.1 kj
2H2(g) + O2(g) ----> 2H2O (l) H = -571.7 kj
B2H6 (g) + 3O2( g) ---> B2O3(s) + 3H2O (l) H= -2147.5 kj

2006-10-29 10:22:39 · 1 answers · asked by Catherine D 1

The question I am trying to answer is "What percentage of water is in the compound CuSO4 5H2O?" Now I know to get percentage I need to figure out Molar mass of H2O/Molar mass of CuSO4 5H2O and multiply by 100, but when I try to figure out the molar mass of water do I just get the MM of H20 or do I multiply water by the coefficient 5 because of the 5H20? Please help me..........I got the answer 14.04%, is that correct.

2006-10-29 10:20:41 · 1 answers · asked by ♥ Arvizu16 3

write a balanced equation for :
a sample of solid potassium chlorate is heated
and
rubidium metal reacts with hydrogen gas.

Also:
C2H4 + ICl5 --> 2 CH2Cl2 + ICl

Given :
ICl5 : -472.5 kj/mol
CH2Cl2 : -403.4 kj/mol
ICl : 135.0 kj/mol

so how ami supposed to find the the delta H using those
all in gas

2006-10-29 10:19:39 · 2 answers · asked by jinternazionale 2

like a project involving things found in your household

2006-10-29 10:11:36 · 5 answers · asked by Anonymous

I am having trouble with this homework (yes homework question). Our teacher just threw it at us and hasn't explained it. It is ok if you would just like to explain how to go about it; that would be great so then I can actually learn how to work the problem. Thanks

2006-10-29 10:05:16 · 1 answers · asked by amalyn 2

I know this is a real basic question but my minds gone blank.

Mass(g) = Concentration(g cm-3) x Volume (cm3)

I know the units work out & mathimatically it makes sense, but does this exist in chemistry?

2006-10-29 09:52:59 · 2 answers · asked by Blimey! 3

2006-10-29 09:38:50 · 4 answers · asked by Anonymous

does anyone know?

2006-10-29 09:33:06 · 9 answers · asked by Lena A 1

http://capa.chem.sunysb.edu/nan/ribo.jpg

2006-10-29 09:28:00 · 1 answers · asked by Reimei 2

2006-10-29 09:27:27 · 4 answers · asked by Aero 2

what is the name for the like little porcelin bowl thing and like a mallot/ hammer thing that we used in science to crush up a tablet into a powder...it kind of has a weird name and i cant remember it...please help thanks [=

2006-10-29 09:25:11 · 5 answers · asked by Manda 2

easy intruction plzz

2006-10-29 09:20:37 · 4 answers · asked by Lori 1

when an atom loses 2 electrons it becomes as ion w/t a charge of
-2
+2
-6
+6

Atoms of 3Li will combine w/t atoms of the element having atomic numbers
10
11
13
17

Thanks a billion if you can help me with these two questions. They puzzle me and I am not completly sure which multiple choice is correct. Thanks again

2006-10-29 09:12:13 · 5 answers · asked by Anonymous

2006-10-29 09:03:14 · 3 answers · asked by t-man foshizzle 2