Chemistry - November 2007

How do you know if a compound has only one name when working with multiple charged cations?

2007-11-04 12:50:50 · 2 answers · asked by Anonymous

Can anyone explain how to calculate the pH of 0.300 M HONH3Cl? and how to calculate a mixture containing 0.300 M HONH2 (Kb =1.1*10^-8) and 0.300 M HONH3Cl?

2007-11-04 12:45:10 · 1 answers · asked by Anonymous

I need help with this problem.

Arrange the following according to expected values for b (volume correction value) in van der Waal's equation.

He, CO2, H2O, HF, SF6

2007-11-04 12:37:43 · 3 answers · asked by Craig S 2

a)electrolytic cells
b) galvanic cells
c)equilibrium cells
d) none of the above

2007-11-04 12:36:53 · 10 answers · asked by Anonymous

like atoms and stuff haha i don't know why i'm asking this

2007-11-04 12:29:44 · 8 answers · asked by Anonymous

a) positive electrode
b) negative electrode
c) electrode at which matter gains electrons
d) electrode at which matter loses electrons

2007-11-04 12:21:24 · 3 answers · asked by lena 1

KATE! if your out there, please help!
thanks soooooo much!
and how do you give best answer?!

2007-11-04 12:14:57 · 4 answers · asked by maryah_may 1

I was just wondering what crayons are made of, like if there's a metallic element or something in it, because if you stick crayons in a microwave to melt them, they'll start on fire. Any help?

Thanks, I would greatly appreciat an answer

2007-11-04 12:04:39 · 9 answers · asked by lil_twin_of_cork 3

^^ I have a few rusting metals made out of the same material as the paperclips that I need to get cleaned. Another question to add to this dealing with paperclips...are the gold paper clips made out of the same material as the silver ones?


Thank you for your time. :)

2007-11-04 11:50:43 · 7 answers · asked by Aqua 2

why does the solution decolorize on standard after the equivalence point has been reached?

Can someone please help me answer this question? thanks

2007-11-04 11:46:38 · 1 answers · asked by abc 1

1. radioactive
2.reactive
3. stable
4. liquid

please answer this question for me =)

2007-11-04 11:43:39 · 7 answers · asked by Anonymous

Thanks, I just couldn't get this one.


You need 2.5 moles of Al for an experiment. How many atoms of Al is this?

Thanks for the help!! :]

2007-11-04 11:42:09 · 4 answers · asked by Anonymous

you have a solid object of unknown composition and mass. You determined that when this object absorbed 100 j of energy its temperature increased by 1k.
What is the objects heat capacity???

2007-11-04 11:41:30 · 2 answers · asked by Anonymous

1. atomic mass
2. atomic weight
3. atomic number
4. mass number

please answer this question please =)

2007-11-04 11:41:21 · 2 answers · asked by Anonymous

Titration of an oxalate sample gave the following percentages: 15.55%, 15.55%, and 15.65%. Calculate the average and the standard deviation.

Can someone please help me answer this question? Please show its done.
thanks

2007-11-04 11:38:21 · 1 answers · asked by abc 1

2007-11-04 11:35:32 · 5 answers · asked by Anonymous

Designate the following as either intensive or extensive properties:

Heat capacity

Specific Heat Capacity

Molar heat Capacity

2007-11-04 11:33:41 · 1 answers · asked by Anonymous

2007-11-04 11:29:41 · 1 answers · asked by taxloop 1

Does it have something to do with a lack of heat energy?

2007-11-04 11:10:04 · 6 answers · asked by Melissa S 2

i know you have to get a drug test, but do they just do a urine test instead of a hair test..?
and if they do give a hair test , if i stay clean will 3 weeks be long enough to get it out of my hair?
we're talking about weed.

2007-11-04 11:04:51 · 3 answers · asked by MansonQueen 2

Dilute 2 mL of ammonium to 100mL with water, then separately mix 10 mL of ammonium with 10 mL of water. Next add the two solutions together? what is the final v/v% , what is the ppm ?

2007-11-04 09:00:01 · 2 answers · asked by Anonymous

102. mL of a solution of quinine contains 206.0 x 10-3 mol of quinine. If this is titrated with 0.0200 M HCl, what is the pH at the stoichiometric point? Quinine is monobasic with Kb = 7.90 x 10^-6

im so lost... thanks for any help!!!

2007-11-04 08:24:20 · 1 answers · asked by TBMlover 1

Calculate the pH of the solution that results from the addition of 0.020 moles of HNO3 to a buffer made by combining
0.500 L of 0.290 M HC3H5O2 ( use Ka = 1.30 x 10 -5 )
and 0.500 L of 0.580 M

thanks!!!!

2007-11-04 08:23:13 · 1 answers · asked by TBMlover 1

Calculate the mass of AgCl that can be prepared from 155 g of NiCl2 and sufficient (i.e. excess) AgNO3.

A. 85.5 g
B. 171 g
C. 120 g
D. 239 g
E. 342 g

2007-11-04 08:10:22 · 4 answers · asked by Lily 2

A quantity of 25 mL 2.0 M NaOH is mixed with 25mL 2.0 M HCl, yielding water and sodium chloride. This is all of the infomation that the problem gives, how do I calculate the molar enthalpy. I am assuming the temperature is constant, but it doesn't even give a temperature, do I need one?

It says I must write the balanced net ionic equation, and the calculate the molar enthalpy of the reaction.

Can someone help me with this please?

2007-11-04 08:09:30 · 1 answers · asked by eclipsegt_01_03 2

Need help with this problem:

The volume of one bike tire is 2.45L. Determine the mass savings if a racer filled both of his tires with helium rather than air. Assume the temperature is 30 degrees C and the racer pumps his tires up to 125 psi (14.6956 psi=1atm). You can also assume that air is 80% nitrogen and 20% oxygen.

2007-11-04 08:09:19 · 1 answers · asked by Anonymous

The mass of water needed to fill a different flask is 194.93 g. The density of water at various temperatures is listed in Appendix D of your laboratory manual. If the temperature is 23.0 deg. C, what is the volume of the flask in liters?
L

2007-11-04 06:45:11 · 1 answers · asked by Heather L 1

This question goes to Paul B: Are you talking about chromatography's physical principle?

2007-11-04 06:12:06 · 1 answers · asked by Anonymous

Choices:

1) HYDORGEN
2) ARGON
3) SODIUM
4) NITROGEN
5) OXYGEN
6) CHLORINE

2007-11-04 05:25:15 · 7 answers · asked by Anonymous

the copper salts are in a small pot
magnesium is to the right of the copper salts magnesium is dangerous and so is in a red pot water is the only compound marked as safe left to right theire is one jar each between bromine,arsnic and magnesium chlorine and iron oxide are dangerous the charchole is not in the 2 left most or two right most pots the iron oxide is in the same size pot as bhromine

2007-11-04 04:31:36 · 11 answers · asked by Floyd U 2