Chemistry - July 2007

2007-07-02 20:27:28 · 3 answers · asked by M 1

Does anyone know the atomic weight of zinc?

2007-07-02 19:06:30 · 2 answers · asked by Anonymous

2007-07-02 18:59:36 · 3 answers · asked by jminor9465 1

Hey this is tricky, well need to do it. I need to find when my water in a heating pot reaches exact 95 deg c without using any form of thermometer

2007-07-02 17:59:21 · 4 answers · asked by Xon 1

Why do binary acids such has Hydrochloric acid contain a reference to Hydrogen in its name-yet Oxyacid names make no reference to hydrogen such as Bromic Acid which contains hydrogen?

2007-07-02 17:29:45 · 2 answers · asked by Gideon 1

I think it mixes, because bubbles only appear when I urinate into the toilet and that might be a chemical reaction with the pressure of the urine hitting the water at a high velocity.. Tell me what you think.

2007-07-02 17:11:20 · 7 answers · asked by HeavenlyRa 2

lewis structure BrSP?

Using the ionization energy chart how much energy will it take to remove only one electron on the surface of Nickel? If you hit the surface of Nickel with a photon that has a wavelength of 90 nm, what will the kinetic energy of that ejected electron be?

Point me in the right direction please =]

sorry can someone tell me how to set this up: If you collect hydrogen gas over water at a temperature of 45OC, what is the volume of just the hydrogen if the pressure of hydrogen is 1.23 atm and the grams of hydrogen was 2.6. What is the volume of the water?

2007-07-02 16:37:49 · 2 answers · asked by Anonymous

to the following equation>
C6H14->C6H6+H2 need to balance

2007-07-02 15:57:21 · 2 answers · asked by Jim S 1

Hypothesis: If the rusting of metal is related to rain, then exposing metal to rain will eventually cause the metal to rust.

What is a way that I could test this hypothesis?

P.S. Do you think this is a good hypothesis?

Thanks for your help!

2007-07-02 14:17:30 · 4 answers · asked by Steven M 3

a) CO and H2O b). CO2 and H2O c)CO2 only d)H2O only e. none of these

2007-07-02 13:19:51 · 5 answers · asked by staylor8319 1

also, PO4 3- as P

2007-07-02 13:16:53 · 2 answers · asked by ta2dpilot 6

I tried it after the boss left a helium canister in the office, though I did have the sense to use a balloon, not straight from the nozzle.

2007-07-02 11:41:37 · 10 answers · asked by undercover elephant 4

or any website i can check

2007-07-02 11:20:57 · 6 answers · asked by ammr1993@sbcglobal.net 1

I am interested in finding out how commercial model rocket companys solidify their engines fuel. There are plenty of places online that explain how to make your own model rocket engines but the only ones I have seen end up as a powderd fuel. When you cut ope a commercial engine its all pressed into a little solid fuel chunk. I would like to be able to do the same.

2007-07-02 11:12:51 · 3 answers · asked by mute8s 2

The pKa of ascorbic acid is 4.2. If I dissolve 1 gram of ascorbic acid in 1 liter of water at 25 degrees Celsius, what percentage of the ascorbic acid molecules will dissociate into C6H7O8- and H+ ions?

2007-07-02 11:12:29 · 3 answers · asked by Anonymous

the given is 6 grams of sugar.

2007-07-02 11:07:53 · 7 answers · asked by Lynn M 1

I always read how hydrogen gas storage is inpractical since you need a massive tank to store enough for any amount of miles in a vehicle. I believe the only accepted alternative to that is to store it in a compressed liquid form under intense cold and pressure.

Question (might be a dumb one): Why can't the hydrogen just be partially compressed as opposed to fully compressed and liquified at liquid nitrogen temperatures? What happens if you just keep pumping hydrogen into a gas-tank sized container until you got as much as you want? Does a rip form in the universe or something? So it gets cold... I don't understand why you can't partially compress enough that, when decompressed and released, you have enough for a hydrogen powered vehicle to get 200 or 300 miles out of a reasonable sized tank.

2007-07-02 11:00:12 · 3 answers · asked by toponder 2

If I use a 1mL sample diluted with DI water, add three drops of Potassium Chromate, then titrate with 0.282 N AgNO3 to a rusty red color. How do I calculate mg/L Chlorides from my sample volume and particular normality titrant? I hope someone understands this question....

2007-07-02 10:41:43 · 3 answers · asked by ehad46 2

2007-07-02 10:25:07 · 20 answers · asked by Anonymous

science science science science mathematics mathematics

2007-07-02 09:58:03 · 11 answers · asked by Anonymous

2007-07-02 09:49:51 · 7 answers · asked by Lost 2

A solution which is formed by combining 200 mL of 0.15M HCl with 300 mL of 0.09M of NaOH has a [OH-] concentration of? PLease help I absolutely forgot how to do it. Thank you.

2007-07-02 09:46:23 · 2 answers · asked by ira s 1

1.
If the outside of the flask is not dried after vaporizing the liquid, will the unknown's calculated molecular
weight is too high or too low? Explain?
2.
Suppose the atmospheric pressure is assumed to be 1 atmosphere instead of its actual value. How wills this
error affects the molecular weight of the unknown? Explain.
3.
If the vapor's volume is assumed to be 125 mL instead of the measured volume, what is the percent error of
the unknown's calculated molecular weight? Show your work.
4.
If the entire unknown does not vaporize in the 125 mL Erlenmeyer flask, will the reported molecular weight
be too high or low? Explain.

5. Solve the following problems.
a) How many moles of gas are contained in 890.0 mL at 21.0 °C and 750.0 mm Hg pressure?
b) What volume will 1.27 moles of helium gas occupy at STP?
c) At what temperature will 0.654 moles of neon gas occupy 12.30 liters at 1.95 atmospheres?

2007-07-02 09:46:22 · 2 answers · asked by Anonymous

Is brass ferrous or non - ferrous ??

2007-07-02 08:53:40 · 15 answers · asked by James b 2

fusion,.,example from solid to liquid.,.

2007-07-02 08:18:09 · 4 answers · asked by lamjals 1

i'm talking about popcorn.

2007-07-02 08:10:56 · 3 answers · asked by Anonymous

2007-07-02 07:21:37 · 2 answers · asked by hustlercane 1

pH H3O^+ OH^- acidic / basic
a) _____ 6.1*10^-8M ______ __________

b)________ _________ 2.6*10^-7M __________

c)5.75 _________ __________ __________

d)________ 3.5*10^-2 M _________ __________

2007-07-02 06:56:48 · 2 answers · asked by its me 1

which of the following will favour the reverse reaction...

the total volume of the system is increased

boiling water is added to the system

water vapour is removed from the system

the system is cooled

2007-07-02 06:22:39 · 2 answers · asked by Anonymous

2007-07-02 06:13:16 · 5 answers · asked by lupiters730 1