Chemistry - May 2007

gas prices rip off

2007-05-03 15:34:17 · 5 answers · asked by frank c 2

2007-05-03 15:31:21 · 7 answers · asked by classy.chic 3

when 10 mL .10M H2SO4 is added to 40 mL .10M NaOH, the pH changes about .5 units. After 10 more mL H2SO4 is added, the pH changes about 6 units. Why?

to anyone who can help, i will be eternally greatful :)

2007-05-03 15:20:51 · 3 answers · asked by alexxiiis 1

Average potential energy of a system
or
Average kinetic energy of a system

2007-05-03 14:18:29 · 6 answers · asked by Anonymous

a. 2Au(NO3)3 + 3Zn (yields) 2Au + 3Zn(NO3)2
b. NiBr2 + Co (yields) Ni + CoBr2
c. BaCl2 + CuSO4 (yields) BaSO4 + CuCl2

2007-05-03 13:49:01 · 1 answers · asked by me 1

i am doing a chem lab and i need to know the specific heat of NaOH. Please help me

2007-05-03 13:36:53 · 0 answers · asked by Lauren J 1

I had to make an chemical equilibrium equation for the reaction about how women take calcium supplements to prevent osteoporosis. A woman suffers from osteoporosis and has gout and may develop kidney stones (calcium urate) so the chemical equilibrium equation I came up with is Ca + NaC5H3N4O3 produces Ca(C5H3N4O3)2 + Na but what I don't get is why this happens in the reaction? (And is my equation correct?)

2007-05-03 13:29:58 · 2 answers · asked by Shane 1

For a single replacement reaction, an element will replace from a compound in aquous solution those elements
a. above it in the activity series b. with lower atomic masses
c. below it in the activit series d. with higher atomic numbers

In the presence of oxygen O2, gold can be expected to
a. rapidly form an oxide b. slowly form an oxide
c. not react d. rapidly form a mettalic hydroxide

In the activity series, oxides of metals below copper
b. do not decompose c. decompose with heat alone
d. are acidic

In activity series, oxides of metals below chromium yield metals when
a. heated wth hydrogen b. cooled below 0degrees celcius
c. combined with oxygen d. added to acids

Since mercury is below coppter in teh activity series, heating HgO will resultl in
a. no reaction b. the formation of a hydroxide
c. the formation og Hg2O d. decomposition

2007-05-03 13:17:33 · 1 answers · asked by asdf123 1

25+24+23+22+...

2007-05-03 12:46:50 · 1 answers · asked by =] 1

2007-05-03 12:25:21 · 1 answers · asked by e=mc^2 1

a Charged
b Short circuit
c Discharged
d Parallel circuit

2007-05-03 11:51:47 · 5 answers · asked by Virginia M 1

has to contain something educational about thel element. such as the element symbol (Ag)...

2007-05-03 11:41:52 · 6 answers · asked by sam. 2

A 225 mL sample of HCl solution reacts with excess Mg to produce 14.0 L H2 gas at STP. What is the molarity of the HCl solution?

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)

Please explain which equation to use/how to work the problem. If you feel like it, it would be helpful to also provide the answer, so I can double check things.

2007-05-03 10:56:15 · 1 answers · asked by Anonymous

What is the pH of a 1.0M solution of NaOCl?? (For HOCl, Ka = 3.1 x 10^-8)

what do i do??
thanks!

2007-05-03 10:49:13 · 3 answers · asked by Nicole S 1

What is the concentration of OCl- in a 0.60M solution of HOCl?? (Ka = 3.1 x 10^-8)

help pleasee!! thanks!

2007-05-03 10:47:47 · 1 answers · asked by Nicole S 1

Does water act as an acid or a base or both? Explain and support your answer.

I know pure water is a neutral, with a pH of 7. but if it acts like both an acid and base, or just a base, or just an acid, im not sure. please help!

2007-05-03 10:30:54 · 7 answers · asked by Nanda 2

Compare the bond length and bond energy of the carbon-carbon bonds in ethane (H3C-CH3), ethene (H2C=CH2), and ethyne (HC=CH). Arrange the compounds in order increasing both length and increasing bond energy.

Bond Length: ---------------------<-----------------------<---------

Bond energy ----------------------< -------------------------<

2007-05-03 09:16:12 · 1 answers · asked by Anonymous

what do you get for the answer


Calculate the molar solubility of PbS (Ksp = 9.04 10-29).


i got 3.562154989E-10 why is it wrong.

2007-05-03 09:15:31 · 3 answers · asked by Krazyk78 1

1. Which gas occupies the smallest volume.

1)Gas A: 2 moles at 101.3 kpa and 273 K
2)Gas B: 1 mole at 56.5 kpa and 273 K
3) Gas C: 1 mole at 101.3 kpa and 273K
4) Gas D: 2 moles at 101.3 kpa and 546 K

How would you find out which one occupies the smallest volume

2.The volume of a confined gas can be reduced by the application of pressure at constant temperature. The change in volumemay be explained by the fact the gaseous molecules...

1) take up space
2) are in constant motion
3)collide without loss of energy
4)have varying masses
5) are relatively far apart

3. When a sample of oxygen gas in a closed container of a constant volume is heated untill it's absolute temperature is douled, which of the following is also doubled..

1) the density of the gas
2) the pressure of the gas
3) the acceleration of the gas molecules
4)the number of molecules

2007-05-03 09:01:07 · 2 answers · asked by Anonymous

could someone please tell me the molecular wieght & density & MP

2007-05-03 07:49:29 · 2 answers · asked by bankofgranite350 1

2007-05-03 07:20:53 · 7 answers · asked by perez n 1

ok, so this is a big question...
i basicly need to know what what the following people thought the atom looked like....if u could send me a link that would be great! thanxs!
these are the people:
john dalton
j.j. thomson
ernest rutherford
niels bohr
james chadwick
maybe- schrodinger

2007-05-03 07:19:00 · 2 answers · asked by Lizy * 1

Could it be related to glucids assimilation?

2007-05-03 06:40:57 · 2 answers · asked by Roy Nicolas 5

Why do metal ions smaller than their metal atoms?
Why are nonmetal ions larger than their nonmetal atom?
-any help is appreciated, thanks so much

2007-05-03 06:32:49 · 7 answers · asked by fireflyspace23 3

I know silicium is used for semiconducors while silver is one of, if not the best, electricity conductor. But besides that, what can be said about the common ground shared by these two elements?

2007-05-03 06:08:29 · 2 answers · asked by Roy Nicolas 5

Erwin was measuring a radioactive substance in the laboratory. He measured 8.0 kg of substance X at noon on Tuesday. At noon on Friday, 3 days later, Erwin measured 1.0 kg of substance X. What is the half-life of substance X?

Please give some information to support your answer.

Thanks!!!

2007-05-03 06:02:25 · 3 answers · asked by Blah. Blah. Blah. RAWR! 1

2007-05-03 05:51:49 · 2 answers · asked by Scott S 1

2007-05-03 05:51:47 · 9 answers · asked by donw487 1

2007-05-03 05:46:58 · 2 answers · asked by Scott S 1

1) (blank)---- hybrid


2) Covalent bond in which one atom contributes both electrons?

2007-05-03 05:39:37 · 1 answers · asked by babes 1