Chemistry - May 2007

There has been a new chemical element found named Diabloioum. There are 3 common isotopes. The first 685Db has an atomic mass of 685.148 and is 92.563% naturally abundant. The next isotope 687Db has an atomic mass of 686.992 amu and is 5.261% naturally abundant, the last isotope 689Db has an atomic mass of 689.012 amu and is 2.224% naturally abundant. What is the atomic mass sample of Diabloium

2007-05-08 05:11:43 · 4 answers · asked by Anonymous

2007-05-08 05:10:43 · 1 answers · asked by Sarah Robert 2

2007-05-08 04:22:16 · 4 answers · asked by pigpigletpoker 1

What is the name and formula of the salt produced in the neutralization of sulfuric acid by potassium hydroxide? Write a balanced equation for the reaction - thank you!

2007-05-08 03:56:21 · 4 answers · asked by Nurse2b 1

All the following contain Ag+ ions

1.) Na2S
2.)NaCL
3.)NaOH
4.) Na2Co3

All the following contain Pb2+ Ions

1.) Na2s
2.) Na2SO4
3.) NaCL
4.)Na2CO3

2007-05-08 03:32:50 · 1 answers · asked by Anonymous

2007-05-08 03:30:37 · 1 answers · asked by Nurse2b 1

1. What is the electron geometry of xenon tetrafluoride XeF4?

2. What are the two possible locations for the lone pairs in xenon tetrafluoride?

3. what is the lewis structure for xenon tetrafluoride?

4. which of the above figurations is most favorable?

5. what is the molecular geometry of xenon tetrafluoride?

2007-05-08 02:46:28 · 2 answers · asked by Anonymous

2007-05-08 01:40:50 · 7 answers · asked by softballfreak 3

2007-05-07 23:09:17 · 1 answers · asked by Anonymous

2007-05-07 23:06:51 · 8 answers · asked by nelly 1

Why is it believed that a carbon atom must form hybrid electron orbitals when it bonds to hydrogen atoms to form methane?

2007-05-07 23:02:29 · 2 answers · asked by Decisiveliu 1

please provide details

2007-05-07 23:01:13 · 3 answers · asked by NK 1

5Fe(2+)(aq) + MnO4(-) + 8H(+) --> 5Fe(3+) + Mn(2+) + 4H2O

2007-05-07 22:59:02 · 2 answers · asked by confused! 1

2007-05-07 22:57:16 · 12 answers · asked by Anonymous

a) H+(aq) + OH-(aq) --> H2O(l)
b) 2KBr(aq) + Pb(NO3)2(aq) --> 2KNO3(aq) + PbBr2(s)
c) CaBr2(aq) + H2SO4(aq) --> CaSO4(s) + 2HBr(g)
d) 2Al(s) + 3H2SO4 --> Al2(SO4)3(aq) + 3H2(g)
e) CO3(2-)(aq) + HSO4-(aq) --> HCO3-(aq) + SO4(2-)

Im totally confused! any help would be great...

2007-05-07 22:56:32 · 2 answers · asked by confused! 1

By acid base reaction i mean something simple as an amine and fatty acid reaction in which an amide and water as a byproduct is formed. Heating is not an easy option as large quantities are involved.

2007-05-07 22:55:52 · 1 answers · asked by C U 1

A gas evolved during fermentaion of sugar was collected at 22.5 degrees celcius and 702mmHg. After purification its volume was found to be 25.0L.

2007-05-07 22:48:51 · 4 answers · asked by confused! 1

So, they say, codeine dissolves into cold water but aspirin only goes into warm. The process is supposed to be: dissolve the lot into hot water, filter then cool it down and filter again. But solutes don't drop out just because a solution has been cooled to the temp that some other substance dissolves at, eh? If you freeze a cup of coffee you just get frozen coffee, not clean water sitting above precipitated instant coffee powder.

Likewise, if we mix codeine and aspirin into hot water, cooling it can't logically drop the aspirin and leave the codeine, can it?

It sounds like silly drug-culture mythology. And since they are all advising each other how to "safely" extract opiates from prescription medications maybe I have a responsibility to go back and tell them their alleged process is bunk?

2007-05-07 22:43:28 · 2 answers · asked by jinjalina 2

Chemical Formulas of the following:
- Ammonium Chloride
- Ammonium Nitrate
- Ammonium Sulphate
- Ammonium Carbonate

2007-05-07 22:28:53 · 3 answers · asked by Anonymous

Chemical Formulas for the following:
- Aluminium Chloride
- Aluminium Oxide
- Aluminium Sulphate
- Aluminium Carbonate
- Aluminium Nitrate

2007-05-07 22:26:32 · 4 answers · asked by Anonymous

- Sodium Hydroxide
- Calcium Hydroxide
- Zinc Hydroxide

2007-05-07 22:23:45 · 5 answers · asked by Anonymous

2007-05-07 22:22:32 · 9 answers · asked by Anonymous

Chemical Formulas of the following:
- Iron(II) Fluoride
- Iron(II) Bromide
- Iron(II) Oxide
- Iron(II) Nitrate
- Iron(II) Carbonate
- Iron(II) Sulphate
- Iron(II) Chloride

- Iron(III) Oxide
- Iron(III) Nitrate
- Iron(III) Carbonate
- Iron(III) Sulphate
- Iron(III) Hydroxide

2007-05-07 22:18:39 · 4 answers · asked by Anonymous

Chemical Following of the following:
- Copper Chloride
- Copper Fluoride
- Copper Bromide
- Copper Oxide
- Copper Nitrate
- Copper Carbonate
- Copper Sulphate

2007-05-07 22:12:39 · 3 answers · asked by Anonymous

Chemical Formulas of the following:
- Magnesium Chloride
- Magnesium Fluoride
- Magnesium Bromide
- Magnesium Oxide
- Magnesium Nitrate
- Magnesium Carbonate
- Magnesium Sulphate

2007-05-07 22:10:35 · 4 answers · asked by Anonymous

Chemical Formulas for the following:
- Potassium Chloride
- Potassium Fluoride
- Potassium Bromide
- Potassium Oxide
- Potassium Nitrate
- Potassium Carbonate
- Potassium Sulphate

2007-05-07 22:08:31 · 4 answers · asked by Anonymous

Chemical Formulas for the following:
- Sodium Chloride
- Sodium Fluoride
- Sodium Bromide
- Sodium Oxide
- Sodium Nitrate
- Sodium Carbonate
- Sodium Sulphate

2007-05-07 22:05:38 · 4 answers · asked by Anonymous

What volume of 0.101 M HNO3 is required to neutralize each of the following solutions?
(a) 12.5 mL of 0.525 M NaOH
mL
(b) 20.5 mL of 0.00455 M Ba(OH)2
mL
(c) 45.1 mL of 0.151 M NH3
mL
(d) 1.41 L of 0.107 M KOH
L

2007-05-07 21:56:32 · 3 answers · asked by kevin 1

Which substance in each pair would be expected to show the largest vapor pressure at a given temperature?
(a) H2O(l) or HF(l)
HF
H2O
Explain your reasoning.

2007-05-07 21:16:50 · 3 answers · asked by kevin 1

The molar heats of fusion and vaporization for water are 6.02 kJ/mol and 40.6 kJ/mol, respectively, and the specific heat capacity of liquid water is 4.18 J/g°C.
(a) What quantity of heat energy is required to melt 23.0 g of ice at 0°C?
kJ
(b) What quantity of heat is required to vaporize 34.5 of liquid water at 100°C?
kJ
(c) What quantity of heat is required to warm 53.9 g of liquid water from 0°C to 100°C?
kJ

2007-05-07 21:16:11 · 2 answers · asked by kevin 1