Chemistry - February 2007

2007-02-01 22:32:18 · 6 answers · asked by Anonymous

2007-02-01 22:22:24 · 2 answers · asked by Anonymous

2007-02-01 21:32:09 · 3 answers · asked by buttercupgrace2002 1

2007-02-01 21:30:38 · 3 answers · asked by Anonymous

(help) Tnx

2007-02-01 21:07:00 · 3 answers · asked by HeLP2007 1

tnx

2007-02-01 21:05:26 · 4 answers · asked by HeLP2007 1

2007-02-01 20:57:35 · 14 answers · asked by atomiccel10 1

2007-02-01 20:48:28 · 3 answers · asked by phoebe e 1

Predict the effect of the addition of an acid or base to the equilibrium system:

2H20(l) <=> H3O+(aq) + OH-(aq)

I think the equilibrium would shift right on both cases because of the decrease of products but that's not what my text book says. Do you know the answer?

2007-02-01 20:45:41 · 2 answers · asked by Anonymous

: what is GTE, TE buffer and ethanol?and the fuction of it in plasmid extration? function of potassium acetate in plasmid extration?

2007-02-01 20:38:28 · 1 answers · asked by teck kim 2

Since I was in high school I remember many discussions and arguments about 5.5 and 3.2 beer. I am originally from Kansas (USA) and with it being a dry state they provide 3.2% beer in Gas Stations and Grocery Stores and at liquor stores they provide 5.5% beer. As youngins high schoolers would make jokes that you got drunk off that lame 3.2% beer. However, I remember a more scientific discussion with a friend that difference is a measurement by VOLUME and WEIGHT. The 5.5% measurement is by volume and the 3.2% measurement is by weight. So, if that is the case, what is the difference in alcohol content between the two beers. Is one a supreme lightweight if he were to get drunk off of 3.2% beer or is he actually getting drunk because the alcohol available in both beers is similar? I would prefer people with a scientific / chemistry back ground to answer but if you know the answer or have any helpful input, by all means answer.

Thanks everyone!

2007-02-01 20:15:06 · 3 answers · asked by webaddict 2

I need to know how to accurately determine whether a substance is polar or not..and i need that method to be able to allow me to put different substances in their order of polarity.
I need to be able to carry out the experiment in a school lab.

2007-02-01 20:00:14 · 2 answers · asked by Anonymous

do you think (know) if the chemicals in a semi-permanent hair colour will affect the flammability of the hair

2007-02-01 19:31:56 · 7 answers · asked by juicinator 1

State whether each of the following is a physical or chemical property........

a) Electricity decomposes water.
b) Ice floats on water
c) Potassium metal fizzes in water
d) Acetone dissolves in water

thanks,

2007-02-01 17:58:45 · 7 answers · asked by Sara 1

Find the amount of substance, in mol, of:

H2O molecules in 20.0g of CuSO4.5H20

2007-02-01 17:43:18 · 1 answers · asked by lilangelsarah23 1

2007-02-01 17:29:40 · 19 answers · asked by Ezequiel P 2

2007-02-01 17:14:31 · 2 answers · asked by Akash 2

for cleaning to swimming pools?

2007-02-01 17:10:03 · 1 answers · asked by Akash 2

2007-02-01 17:08:18 · 1 answers · asked by Akash 2

2007-02-01 17:07:49 · 9 answers · asked by Karlos 1

2007-02-01 17:07:25 · 4 answers · asked by Akash 2

In my yr 11 chemistry course I've been asked to copy out a figure titled 'A classification of matter'. In the fig. matter is divided into two sections 'homogeneous, eg. muddy water and concrete.' and 'heterogeneous, eg. copper and air'. Could you please define 'heterogeneous' used in this context for me as definitions on the internet are highly generalized.

2007-02-01 16:58:47 · 4 answers · asked by Alley 2

and i need help on a question

when a 20g of sample of solid Pb(NO3)2 dissolves in 60g of water in a calorimeter, the temperature drops from 25 C to 20 C. calculate ΔH for the solution process.

Pb(NO3)2 (s) ---> Pb^2+ + 2 NO3 - (aq)

sorry can never type an equation on the net.

2007-02-01 16:54:43 · 1 answers · asked by Zac 2

the equation for the synthesis of ammonia is N2 + 3 H2 ---> 2NH3. how many grams of H2 are needed to produce 45 mol NH3 ?

Can someone explain this and how to do it step by step...

2007-02-01 16:30:31 · 2 answers · asked by Zac 2

Question:
Ag+ + Cl- ---- AgCl (s)
AgCl (s) + 2NH3 ----- Ag(NH3)2 +
Ag(NH3) + + Br- ------ AgBr (s)
AgBr (s) + 2S2O3 2- ----- Ag(S2O3)2 3-
Ag(S2O3)2 3- + I- ----- AgI (s)

From the data above, list the following equilibrium solutions in the order of decreasing free Ag+ concentration in the mixture: 0.1 M AgNO3, saturated AgCl, saturated AgBr, saturated AgI, Ag(NH3)2 +, and Ag(S2O3)2 3-.

My Approach:
Tough one. I have a slight idea, but I don't think it observes any of the equilibrium laws arrrgghhh!! (i award best answers to those who take some stress off of me)

2007-02-01 16:29:19 · 3 answers · asked by Anonymous

2007-02-01 16:10:02 · 1 answers · asked by Anonymous

frequency= 1.26e19 s-1
wavelength= 6.0e-5 m


Any help is appreciated!

2007-02-01 16:08:59 · 3 answers · asked by Paul Foglino 1

2007-02-01 15:57:22 · 3 answers · asked by CR7 3

Define a chemicle bond.

Describe the type of bonding that exists between the atoms in hydrogen molecule, H2

Describe the type of bonding that exists between the atoms in the hydrogen Floride molecule, HF

2007-02-01 15:49:25 · 1 answers · asked by Anonymous

A house with a 16.2 × 103 ft2 floor area and 8.50 ft high ceilings is to be heated with propane. How many kilograms of propane would be needed to raise the temperature of the air inside the house from 63.0 oF to
73.0 oF ?. In this calculation your are ignoring the temperature of the walls etc.



The moloar specific heat of the air inside the house is 30.2 J mol −1 oC −1
The average density of air over this temperature range can be estimated to be 1.22 g/L.
The molar mass of air is 29.1 g/mol.
There are 28.317 liters in a cubic foot.
The molar heat of combustion of propane is −2220.047 kJ/mol


PLEAASE HELPPP I NEED ANSWER + EXPLANATION IF POSSIBLE :) thankyoooou!

2007-02-01 15:42:00 · 3 answers · asked by Jessica R 1