Chemistry - May 2007

The volume strength of 1.5 NH202….. true/false

2007-05-16 01:52:03 · 1 answers · asked by Anonymous

2007-05-16 01:43:20 · 2 answers · asked by Jimbo S 1

1. H2+Br2O2 HBr
2. N2+3_H2O2 NH3
3. Cocl2 ◄─ ►Co+Cl2
4. Pcl3+Cl2 Pcl5

2007-05-16 01:41:08 · 1 answers · asked by Anonymous

2007-05-16 01:06:40 · 5 answers · asked by ? 2

Also, is it dependent on the molecular weight of what you are converting or is it just dependent on the solvent?

2007-05-16 01:00:37 · 2 answers · asked by dreama_120987 2

My partner has told me your body is made of salt and electricity is this true? i know that your body has salt but electricity???

2007-05-16 00:54:00 · 4 answers · asked by angelab_86 1

You see I need something that will rub off on those who come into contact with it easily so I can identify the object touching it but on a very large scale.

2007-05-16 00:41:41 · 2 answers · asked by Anonymous

2007-05-15 23:48:23 · 1 answers · asked by anirudhpant 1

Compare growth requirements of fungi, viruses, bacteria, protozoans and multicellular parasites?

2007-05-15 22:43:20 · 3 answers · asked by Anonymous

Really need some help with calculating rate of condensation of water vapor to liquid.

I have the condensation coefficient, vapor pressure, temperature, and surface area of the water in bulk(not droplet). How do I get the rate of condensation.

Lots of thanks

2007-05-15 21:23:43 · 1 answers · asked by Anonymous

I have completed an experiment which was " to investigate the effect of surface area on the rate of reaction on 'tum' tables and hydrochloric acid" i now have to draw a graph to show my average results and write up my conclusion.

I used these 3 surface areas for the tum tablets : 1 whole table, 2 halves of 1 tablet (cut the tablet in half) , and 1 whole tablet powdered. Now the results were spread by alot , for example my average for 1whole table was 269 secs and average for 2 halves was 239 and my average for powder was 96s. how am i suppose to draw a graph for this??

also for conclusion do i just write " As the surface area increased the rate of reaction also increased " since when doing the concentration test i can just write " As the concentration increased the rate of reaction also increased"
or do i need to state the powder form was the largest and fastest?

Thanks.

2007-05-15 21:14:42 · 1 answers · asked by questioneer112 1

nitrogen measured at STP. What volume of 0.1M would be needed to neutralise 50ml of 0.2 solution of X.

2007-05-15 20:51:50 · 1 answers · asked by Jackson S 1

The density of a solution of 3.70g NaBr in 28.20g H2O is 1.22g/mL.

Calculate the molality of NaBr in the solution.


1.47 m
0.96 m
1.13 m
1.28 m
1.01 m
1.40 m

2007-05-15 20:21:26 · 1 answers · asked by Anonymous

Bromobenzene, C6H5Br, and chlorobenzene, C6H5Cl, form essentially ideal solutions in all proportions.

At 100°C, the equilibrium vapour pressure of bromobenzene is 137mmHg and that of chlorobenzene is 285mmHg.

Calculate the equilibrium vapour pressure above a 12.9% (w/w) solution of bromobenzene in chlorobenzene at a temperature of 100°C.


156 mmHg
15609 mmHg
151 mmHg
26591 mmHg
271 mmHg

2007-05-15 20:19:55 · 1 answers · asked by Anonymous

2007-05-15 19:19:06 · 2 answers · asked by Anonymous

a)23, b) 24, c) 25, or d)26

help me figure out how you came up with the answer d. (d is the correct answer)

Thanx

2007-05-15 18:41:08 · 1 answers · asked by xxxladyxxx 1

Is caustic soda is used as raw material for power generation

2007-05-15 18:10:19 · 2 answers · asked by Anonymous

Hi, I'm tryna think of an example of a non-polar organic solid compound... can you guys think of anything?

thanks

2007-05-15 18:06:29 · 2 answers · asked by B 1

2007-05-15 17:31:03 · 1 answers · asked by Anonymous

I can only help with Molar Mass, that's it...

Molar Mass of NaOH is 39.998
Na: 22.99 + O: 16.00 + H: 1.008

Molar Mass of H2SO4 is 98.086
H: (2) 1.008 + S: 32.07 + O: (4) 16.00

Please show me how you do it step by step, thanx.

2007-05-15 17:23:21 · 3 answers · asked by xxxladyxxx 1

Which of the following undergoes Sn2 reaction with sodium methoxide most rapidly?

a. PhBr
b. PhCH2Br
c. PhCBr
d. PhCH2CH2Br
e. PhCH2CH2CH2Br

I think it is 'e', but I cannot find a reference in my textbook yet that backs that up.

2007-05-15 17:21:53 · 1 answers · asked by jeanettervetr 2

A bag of potato chips is packaged at sea level (1.00 atm) and has a volume of 315mL. If this bag of chips is transported to Denver (0.775 atm), what will the new volume of the bag be?
(Assume the temp is constant)
this is using combined gas law...
help please??

2007-05-15 16:43:51 · 5 answers · asked by Mandi M 1

How is it possible that negatively charged beta particles are emitted from a positively charged nucleus during nuclear decay?

2007-05-15 16:10:11 · 2 answers · asked by rykster22 1

Is cyclopentadiene what you would call an aromatic compound?

2007-05-15 16:00:07 · 1 answers · asked by jeanettervetr 2

if the ph is 2.2 and the poh is 11.8 what is the h+ and oh-

is it 6.3 x 10^-3 and 1.58x 10^-12 could you explain why

2007-05-15 15:58:47 · 4 answers · asked by Adam d 1

2007-05-15 15:53:22 · 2 answers · asked by rambabu26 d 1

What is the amount of time it takes for three-fourths of a radioactive sample of an isotope of bromine to decay? The half-life of that isotope is 16.5 hours.

Also, how do I find the half-life for future reference?

2007-05-15 15:40:47 · 2 answers · asked by rykster22 1

Draw all of the structural isomers of hexane that you can devise

2007-05-15 15:36:23 · 6 answers · asked by jasonanthonybau 1

I'm having problems understanding oxidation and reduction, I'm not sure how to assign oxidation numbers. Like with compounds like H20 I know that hydrogen is +1 and oxygen is -2...but in reactions involving compounds with three or more elements I get confused, despite reading the rules for assigning oxidation numbers. Can someone explain what I do for reactions like:
a)2AgNO3+Cu----->Cu(NO3)2+2Ag
For this one I know that O is -2 so the sum of Ag and N has to be +6 to balance the compound's charge. But how do you figure out what charge N has and what charge Ag has?

b)3AgNO3+K3PO4---->Ag3PO4+3KNO3
Again, I know that O is -2, but how do I figure out the rest?

Also I'm a bit confused as to why when I write out ionic formulas...
Like for c) why is it:
3[Ag+NO3] and not 3[Ag+N+O3]?

These might seem like dumb questions but I'm pretty new at this and I'm having a bit of trouble understanding it...Thanks in advance for explaining it to me (I didn't get the textbook).

2007-05-15 15:14:18 · 5 answers · asked by alexk 2

NH3 + PbO = N2 + Pb + H20

I don't understand what to seperate into the reduction and oxidation equations and then how to balance it. I can do single elements added together in a synthesis but not these.

THanks in advanced

2007-05-15 15:13:14 · 1 answers · asked by tbarron314 1