Chemistry - May 2007

Using only 5.00, 10.00, and/or 25.00mL volumetric pipets, up to four 100mL flasks, and water, how would you make 100mL of a 0.00125M solutioin of NaOH from 1.0L of a 0.10M NaOH solution?

2007-05-05 14:09:21 · 2 answers · asked by tzier187 2

I have a problem solving this Question can ayone help me
It would be kind if you answer me.

2007-05-05 13:50:53 · 2 answers · asked by Sarah Robert 2

Why will hot water, for example, absorb more sugar when the water is heated?

2007-05-05 13:34:26 · 6 answers · asked by hope03 5

2007-05-05 12:55:46 · 1 answers · asked by Chem Mick 1

6CO2 (g) + 6H2O (l) ---> C6H12O6 (s) + 6O2 (g)

∆H = 2820 kJ

For the above reaction tell how the amount of C6H12O6 (s) present at equilibrium would be affected by each of the following:

a) some CO2 (g) is added
b) the temperature is raised
c) the volume is decreased
d) some O2 (g) is removed
e) some of the C6H12O6 (s) is removed
f) a catalyst is added
g) some H2O is removed

The answers are supposed to be in the form of : shift left/right

I know the first answer is shift right

10 points to anyone who can answer these!!!!

2007-05-05 10:55:49 · 4 answers · asked by tralala 1

Im confused about the types of crystals ionic, metallic, molecular, and macromolecular and what it means by they are conductors (Electricity) when they are molten?? what does molten mean?? any examples ?? is it something to do with electrolysis.. HELP!! lol i have a GCSE chem exam and i am not very good at chemistry nd what is it with the water solubility thing??? and can someone also explain the way ionic structures cleave because they are brittle??

2007-05-05 10:50:46 · 3 answers · asked by Anonymous

if you have read this article or want to http://pubs.acs.org/cen/coverstory/85/8503cover.html
and then want to sum it up in a few sentences for me that would be awesome. I find stem cells very complicated and I hope someone will want to help me.

2007-05-05 10:39:36 · 1 answers · asked by shellybelly 2

A 20 cm cube sample of carbon disulphide vapour is ignited with 100 cm cube of oxygen. The final volume of gas after burning is treated with an excess of aqueous alkali.
What percentage of this final volume dissolves in the alkali?

2007-05-05 09:41:14 · 2 answers · asked by polol 2

(a) convert a gas to a solid at its critical temperature
(b) convert a liquid to a solid at its critical tempertature
(c) freeze a liquid at its critical temperature
(d) liquefy a gas at its critical temperature
(e) vaporize a liquid at its critical temperature

2007-05-05 09:41:07 · 1 answers · asked by thuong4187 1

(A) All affect a photgraphic plate
(B) Alpha rays possess charged particles
(C) Beta rays move most rapidly
(D) Beta rays lack charged particles
(E) Gamma rays display high frequency waves

2007-05-05 09:33:10 · 6 answers · asked by 2Quinn 2

reaction rate at an earlier temperature setting. All other environmental factors are held constant. This earlier temperature was most likely:
(A) 0 degrees
(B) 10 degrees
(C) 25 degrees
(D) 40 degrees
(E) 45 degrees

2007-05-05 09:26:44 · 2 answers · asked by 2Quinn 2

can someone show me how to figure out a problem like this one?

What is the empirical formula for a compound whose composition by mass is 40%Sulfur and 60%Oxygen?

I've looked all through my notes and can't find anything that will help and my book doesn't explain it well

2007-05-05 09:17:38 · 2 answers · asked by Ashboo 2

2007-05-05 09:16:14 · 4 answers · asked by Jessica A 1

2007-05-05 09:03:33 · 3 answers · asked by Jessica A 1

Consider the solubility equilibrium system representedby the equation below:
PbSO4(s)<-->Pb+2(aq) + SO4-2(aq)
what happens to the mass of the concentration of lead ions and the lead sulfate when more K2SO4 is added to the system??
thanks

2007-05-05 09:02:27 · 1 answers · asked by Nicole S 1

What happens to the pH and hydrogen ion concentration when water is added to a solution of HCl??
thanks!

2007-05-05 08:59:13 · 3 answers · asked by Nicole S 1

Which oxides are basic anhydrides??
Na2O
BaO
ZnO

thanks!

2007-05-05 08:57:58 · 2 answers · asked by Nicole S 1

2007-05-05 08:56:14 · 2 answers · asked by SICK MY DUCK! 1

Two similar balloons are filled with helium. One is filled to a volume of two liters and the other to four liters. In which balloon are the helium molecules moving more rapidly? why?

2007-05-05 08:45:18 · 7 answers · asked by SICK MY DUCK! 1

How many R/hr @ 1' ,or whatever units you know. Is it regulated by the NRC ,or is the output too low?

2007-05-05 08:31:46 · 1 answers · asked by cuda318cid 2

How do i answer this?

Given the following data:

[C]--------[D]--------Initial Rate
mol/L---mol/L-----mol/Ls
0.24-----0.10-----2.1 x 10 ^-2 (0.021)
0.48-----0.10-----8.4 x 10 ^-2 (0.084)
0.72-----0.20-----3.8 x 10 ^-1 (0.38)

"Determine the rate expression for the reaction
C + 2D --> E + 5F. Determine the value of the rate constant k."

2007-05-05 08:15:45 · 1 answers · asked by Jeff Flynn 1

this is for my revision

2007-05-05 07:18:53 · 4 answers · asked by Anonymous

(the experiment was putting ice in a styrofoam cup putting the thermometer and adding slat till it reached a certain temp and after that we took the thermometer out and calculated the temp at an interval of 30 secs)

2007-05-05 07:00:04 · 1 answers · asked by j 1

(explain)

2007-05-05 06:43:31 · 1 answers · asked by j 1

I found this quote on the web and I want to know if it is really true or false: "A snowflake is made up of a billion, billion molecules of water organized in a specific and stable arrangement. You will never ever find two identical snowflakes, even if you spend all your life trying. But if you melt a snowflake, and refreeze it under the same conditions, it will refreeze into exactly the same pattern, not a similar arrangement, but precisely the same one! It remembers its previous arrangement, and goes right back to it.”

2007-05-05 06:42:43 · 7 answers · asked by Anonymous

2007-05-05 06:34:52 · 1 answers · asked by James May 1

From engines etc, i have no idea if C would be a radical or what small Cx structures are stable.

2007-05-05 06:26:58 · 2 answers · asked by James May 1

2007-05-05 05:39:30 · 2 answers · asked by Anonymous

mass of slug: 17.90 grams

intial temperature of SBC (simple bomb calorimeter): 21.91 degrees Celcius

Max. temp: 25 degrees celcius

slug: length x width= 5cm x 1cm

radius: 0.6 cm

Questions:

Find Q for Water

Specific heat capacity the slug.

Density of Metal


(density of water is 1g/ml)

2007-05-05 05:39:01 · 2 answers · asked by Sum1 2

Consult a reference book regarding the hazards associated with H2S. On the basis of this information, in which it is to be used. Briefly explain the chemistry involved in this generation.

2007-05-05 05:12:49 · 1 answers · asked by Anonymous