Chemistry - February 2007

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2007-02-05 15:25:52 · 4 answers · asked by Anonymous

It's a two part question!

2007-02-05 15:20:39 · 11 answers · asked by Anonymous

2007-02-05 15:18:53 · 4 answers · asked by Anonymous

What are the elements called in the first row of the rare earth elements of the periodic table?
The worksheet scramble letters are: "sletahnaidn".

Thank you!

2007-02-05 15:18:52 · 4 answers · asked by Yahoo! User 2

a volume of 2.27 mL of SiCl (density = 1.438g/ml) reacts with an excess of H2S (g), giving HSSiCl3 according to the reaction:
SiCl4(l) + H2S (g) --> HSSiCl3 (l) + HCl (g).
If the HCl produced reacts with 8.267 x 10^-3 mol of NaOH according to the reaction:
HCl + NaOH --> NaCl + H2O. What is the percent yeid of HSSiCl3?

If that wasn't hard enough...
A common oven cleaner contains a very caustic metal hydroxide, which we represent as MOH. Reaction of .7134 grams of MOH with HNO requries 4.50 grams to reach the end point.
MOH + HNO3 --> MNO3 + H2O.
what is the element M and what is the formula of the hydroxide..

Any help at all would be greatly appreciated. I have no clue how to even attempt. Thank you for your time!

2007-02-05 15:14:30 · 1 answers · asked by Victoria 2

A suggested mechanism for the reaction of nitrogen dioxide and fluorine is


Step I NO2 + F2 --> NO2F + F (slow)


Step II F + NO2 --> NO2F (fast)


Which of the following statements are true?


a) Step II is the rate determining step


b) For the rate determining step : rate = k[NO2][F2]


c) The overall reaction is 2NO2 + F2 --> 2NO2F


d) The experimental rate law is k[NO2]

Can be more than 1 correct answer

2007-02-05 15:09:33 · 2 answers · asked by Anonymous

How do the lenses in an electron microscope and a compound microscope differ??
Someone please answer ASAP
Thanks!

2007-02-05 15:04:58 · 1 answers · asked by Natasha 3

2007-02-05 14:54:35 · 5 answers · asked by arthurar15 1

Can someone give me a method of distilling water by freezing? I am doing an experiment where I compare methods of desalinating water and this is one theory I am testing. Can someone please help?

2007-02-05 14:30:51 · 3 answers · asked by Anonymous

5 properties of Carbon Dioxide

2007-02-05 14:20:48 · 3 answers · asked by kiwi 1

2007-02-05 14:16:28 · 3 answers · asked by Anonymous

how many grams of sugar would you need to have the same number of particles as 15.0 grams of table salt?

how exactly do i solve this? do i use avogadro's number as well?

2007-02-05 14:12:46 · 2 answers · asked by stephh<3 2

Directions (For all problems use the following units: atm, Kelvin, moles and Liters)
What are the units on each of the variables in the ideal gas equation?
PV = nRT
2. If a gas sample has a temperature of 32.5 degrees Celsius, what is the temperature of the gas in Kelvins?
3. What is the volume of 1 mol of an ideal gas at 273 K and 1 atm of pressure?
4. What is the temperaure (in Kelvins) of a sample of an ideal gas if 1.5 moles of the gas occupy a volume of 27 liters at 1.1 atm.
I have some answers but i want to make sure is correct

2007-02-05 14:02:08 · 2 answers · asked by princess 1

2007-02-05 13:58:16 · 5 answers · asked by Anonymous

Would this have something to do with the molecular weight being low?

2007-02-05 13:56:42 · 5 answers · asked by MP5 3

2007-02-05 13:51:46 · 3 answers · asked by nahar23 1

2007-02-05 13:47:55 · 2 answers · asked by Lina 2

What is the mass of 38.2 ml of dry air at STP?

I figure I need to use PV=nRT (solving for n)

[(760)(.0382)] / [(.0821)(273)]
= 1.30 mol (rounded)

but, I don't know where to go from there to finding the mass...

Any help is appreciated!

2007-02-05 13:33:29 · 1 answers · asked by Jess S 1

The temperarture is supposed to be 212 F...

2007-02-05 13:27:40 · 1 answers · asked by kiLLah 1

do u use prefixes in ionic compounds?
are molecular and covalent compounds the same?
when must parentheses be used in writing formulas?

2007-02-05 13:21:04 · 5 answers · asked by mike 1

we were doing a lab today and i got stumped by this:
when you heat a can over a flame for a few seconds and then put it into a tray with water, why does the water get sucked into the can when before, when not heated, it floated??

2007-02-05 13:17:21 · 1 answers · asked by Anonymous

Which one would have the least density and which one the greatest density?

2007-02-05 13:10:52 · 2 answers · asked by THOMAS J 1

2007-02-05 13:01:35 · 4 answers · asked by whatever_9123 1

2007-02-05 12:54:09 · 2 answers · asked by dragonfly32112p 1

How many moles of sulfate ions, cobalt(III) ions, and oxygen atoms are present in 0.408 mol of cobalt(III) sulfate?
Please Explain!

2007-02-05 12:51:55 · 1 answers · asked by just_curious 1

plz help

2007-02-05 12:46:50 · 3 answers · asked by Riccardo 2

From the following:
pure water
solution of sucrose (molality = .01) in water
solution of NaCl (molality = .01) in water
solution of CaCl2 (molality = .01) in water

a) highet freezing point
b) lowest freezing point
c) highest boiling point
d) lowest boiling point
e) highest osmotic pressure


please help! due tmrw!

2007-02-05 12:30:15 · 1 answers · asked by suggargurl302 2

2007-02-05 12:27:29 · 8 answers · asked by Adina 2

How many moles of sulfate ions, cobalt(III) ions, and oxygen atoms are present in 0.408 mol of cobalt(III) sulfate?

I know how to do it but I just don't know the formula for cobalt(III) sulfate!

2007-02-05 12:21:59 · 7 answers · asked by beachbum 2

A. First ionization energy
B. Atomic Radius
C. Electronegativity
D. Ionic Radius.

Please help me and explain how you get your answer. I understand A and C, but not B and D. Anyway I know you have to use a periodic table. Can you help?

2007-02-05 12:21:12 · 2 answers · asked by Anonymous