Chemistry - December 2007

with mercury and toxic risin gas or whatever that stuff is mixed with a bunch of carbon dioxide that was solidified.
Wonder if someone could top all that...

2007-12-30 17:08:57 · 7 answers · asked by some black dude with no life 1

2007-12-30 17:07:08 · 2 answers · asked by Anonymous

1) Why is it needed that the concentrated HCl is cold upon addition to the tert butanol?
2) Why is distillation a part of the synthesis of tert butyl chloride?
3) Why is it important that the flow of water in the condenser continous?

Thank you very much!

2007-12-30 16:52:47 · 1 answers · asked by Aj 2

Two chlorine molecules will cobine to form a Cl2O2 molecule (Cl-O-O-CL).

A) What will be the molecular structure? (the molecule contains an oxygen-oxygen bond). Include bond angles where appropriate.

B) What is the hybridization for each atom in your model that is bonded to two or more atoms???

2007-12-30 16:38:35 · 2 answers · asked by Anonymous

how many grams of acid are needed to react with 75.0 grams of iron (II) sulfide ore which contains 30.0% inert material?

please provide the formula for me

2007-12-30 16:33:22 · 4 answers · asked by <3youu! 2

i had to do a lab in chemistry where we find out the amount of calories in junk food and we compare it to what the company claims it has ..

for cheetos i found out that there's about 3.6 cal per gram. i looked at the nutritional facts and the label says that there are 5 cal per gram. i was just wondering whether the label's value was in cal or kcal .. if it is in cal, then my calculation came pretty close .. i just have to take the experimental design flaws into consideration to justify why the values are not identical .. however, if the value 5 was in kcal, then my calculations are just totally off.

same goes for kitkat and ruffles << the other two food samples we tested.

ive read on a site that most of the time, the amount of calories on food labels are in kcal. i just want to make sure if that is the case for every single one of them.

i hope the values are in cal and NOT kcal. coz that means my calculations are pretty close >.<

thanks in advance!!

2007-12-30 16:32:59 · 6 answers · asked by tokyo_drift 2

write a balanced equation describing the reaction of aluminum metal with concentrated aqueous sodium hydroxide. thankyouuuu...i appreciate it.

2007-12-30 16:15:53 · 3 answers · asked by me 2

what bond order should be observed for the sulfur-oxygen bond in the sulfur dioxide molecule???

2007-12-30 16:04:43 · 5 answers · asked by Anonymous

ALuminum hydroxide is amphoteric and will dissolve in both acidic and basic solutions. Write balanced hcemical equations representing each process. thankyou..i appreciate it.

2007-12-30 15:49:39 · 3 answers · asked by me 2

2007-12-30 15:44:44 · 2 answers · asked by Anonymous

AgNO3+MgCl2→Mg(NO3)2+AgCl

2007-12-30 15:34:55 · 2 answers · asked by talksmack4416 1

Please explain this to me... If i were to balance the equation Ch4+O2>CO2+H2O + energy, and i start with balancing the Oxygen atoms, then the Hydrogen, then the Carbon. Why do i end up with a different equation if i balance let's say....H first. Does the order the the elements matter? How can i do this correctly?

2007-12-30 15:32:21 · 4 answers · asked by talksmack4416 1

For sulfur dioxide, Use VSPER to predict the underlying gemotery for the valence electrom domains and the molecular geometry. Give approximate bond angles

I know the angle is 120 degrees. and thats about it...can u help me?

2007-12-30 15:22:44 · 5 answers · asked by Anonymous

2007-12-30 14:58:58 · 5 answers · asked by me 5

What is the long hand electron configuration for element K (potassium I think)?

2007-12-30 14:54:37 · 2 answers · asked by Anonymous

Which is the formula for the compound that forms when magnesium bonds with phosphorus?

a- Mg3P2
b- MgP2
c- Mg2P3
d- Mg2P

thanks in advance =)

2007-12-30 13:29:40 · 1 answers · asked by wat_up_dude 1

When the electrons of an excited atom return to a lower energy state, the energy emitted can result in the production of

a- protons
b- spectra
c- isotopes
d- alpha particles

thanks in advance =)

2007-12-30 13:24:36 · 4 answers · asked by wat_up_dude 1

Compared to a sodium atom in the ground state, a sodium atom in the excited state must have

a- an electron with greater energy
b- a greater number of electrons
c- an electron with less energy
d- a smaller number of electrons

thanks in advance =)

2007-12-30 13:21:50 · 4 answers · asked by wat_up_dude 1

Compared to the entire atom, the nucleus of the atom is

a- larger and contains most of the atom's mass
b- smaller and contains little of the atom's mass
c- smaller and contains most of the atom's mass
d- larger and contains little of the atom's mass

thanks in advance =)

2007-12-30 13:13:41 · 1 answers · asked by wat_up_dude 1

A student determining the percent by mass of water in a hydrated crystal obtained the following data.

Mass of crystal before heating....5.0 g
Mass of crystal after 1st heating..4.0 g
Mass of crystal after 2nd heating..4.0 g

What is the percent by mass of water in the hydrate?

a- 0.80%
b- 0.20%
c- 20.%
d- 80.%

thanks in advance =)

2007-12-30 13:06:34 · 3 answers · asked by person 3

What is the total number of moles of oxygen atoms in 1 mole of ozone? (Molecular mass = 48)

a- 1
b- 2
c- 3
d- 4

thanks in advance =)

2007-12-30 13:01:47 · 4 answers · asked by person 3

What is the molarity of a nitritic acid solution, HNO3, if 20.0 mL of the solution is needed to exactly neutralize 10.0 mL of a 1.67 M NaOH solution?

a- 3.34 M
b- 1.67 M
c- 0.334 M
d- 0.835 M

thanks in advance =)

2007-12-30 12:59:15 · 3 answers · asked by person 3

When hydrochloric acid is neutralized by sodium hydroxide, the salt formed is sodium

a- hydrochlorate
b- chloride
c- chlorate
d- perchloride

thanks in advance =)

2007-12-30 12:55:16 · 2 answers · asked by person 3

What is the name of the salt produced by the reaction of calcium hydroxide with sulfuric acid?

a- calcium sulfite
c- calcium sulfate
c- calcium sulfide
d- calcium thiosulfate

thanks in advance =)

2007-12-30 12:53:33 · 4 answers · asked by person 3

According to Reference Table V, which of the following is the strongest Bronsted-Lowry acid?

a- HS-
b- H2S
c- HNO2
D- HNO3

thanks in advance =)

2007-12-30 12:51:18 · 2 answers · asked by person 3

Which of the following is the strongest base (proton acceptor)?

a- Cl-
b- F-
c- I-
d- Br-

thanks in advance =)

2007-12-30 12:49:37 · 2 answers · asked by person 3

What is the oxidation number of oxygen in hydrogen sulfate ion, HSO4 - ?

a- +1
b- -2
c- +6
d- -4

thanks in advance =)

2007-12-30 12:37:13 · 1 answers · asked by person 3

A mixture of ethanoic (acetic) acid and ethanol (ethyl alcohol) is heated in the presence of concentrated sulfuric acid. The organic product formed is

a- CH3COOC2H5
b- CH3COC2H5OH
c- C2H5CH3COOH
d- CH3COC2H5

thanks in advance =)

2007-12-30 12:27:22 · 1 answers · asked by person 3

examples of molecules in triangular pyramidal in orientation aside from NH3. tnx

2007-12-30 12:13:41 · 4 answers · asked by alex g. 1

I need a LOT of help with this one.
What in the world is the better power plant? I know the nuclear power plants are really dangerous...but the fossil fuel plants are pretty bad for the environment.
PLEASE SOMEONE HELP!
I need a good website or a decent amount of information on this subject.
Hope to find someone who has something! Haha

Thank you!

2007-12-30 11:11:50 · 8 answers · asked by Anonymous