Chemistry - April 2007

2007-04-22 11:21:21 · 2 answers · asked by Anonymous

what happe3ns to air when it is heated
does it expand do nothing contracts stays the same or vaporizes

2007-04-22 11:12:20 · 4 answers · asked by balewolfarms 1

a) HBr : A Bronsted acid and a Lewis acid

b) HCN : A Lewis acid, but not a Bronsted acid

c) CH3COOH : A Lewis acid, but not a Bronsted acid

d) Ni 2+(aq) : A Bronsted acid, but not a Lewis acid

e) CH3CH2CH2CH3 : Both a Bronsted acid and a Lewis acid

2007-04-22 10:39:08 · 3 answers · asked by mimi 1

I'm doing a lab report for my chemistry class and i'm totally stumped on four molecules. i can't figure out the polarity of TeCl6, PF5, [NO2]- and H2O ... anyone have any tips?

2007-04-22 10:31:07 · 2 answers · asked by Fluttrbye 1

HI, I WOULD LIKE TO INTERVIEW SOMEONE OVER THE INTERNET OR POSSIBLY THE PHONE FOR MY RESEARCH PROJECT. FOR MY CHEMISTRY CLASS I AM TO INTERVIEW SOMEONE WHO HAS A CHEMISTRY DEGREE BUT HAS A NON TRADITIONAL CAREER. WOULD YOU PLEASE ALLOW ME TO ASK ABOUT 6 QUESTIONS. THANKS

2007-04-22 10:27:51 · 1 answers · asked by aqeelah k 1

Water, H2O, is less than half as heavy as Carbon Dioxide, CO2. Why then is the boiling point of water so much higher than that of carbon dioxide?

2007-04-22 10:17:19 · 7 answers · asked by nikki 1

also i have to write a balnced equation for the reaction that occurs when sodium cyanide dissolves in water.

2007-04-22 10:11:16 · 3 answers · asked by cara g 1

I'm studying for my chemistry test tomorrow and I can't seem to get the answers to these questions that are on my study guide. Can anyone help me?

In the following reaction between a weak acid and a strong base, which of the following is the spectator ion (hint, write out the net ionic equation)?

HF(aq) + KOH(aq) --> KF(aq) + H2O(l)


a. H+
b. F-
c. K+
d. OH-
e. HF


What is the hydroxide ion concentration, [OH-], in a solution with a pH of 12.75?

What volume of 0.100M nitric acid reacts completely with 0.500 g of sodium carbonate, Na2CO3 (105.99 g/mol)?
Na2CO3(s) + 2HNO3(aq) --> 2NaNO3(aq) + H2O(l) + CO2(g)

a. 10.6 mL
b. 23.6 mL
c. 47.2 mL
d. 94.3 mL
e. 1.00 L

BEST ANSWER TO FIRST CORRECT

2007-04-22 10:09:41 · 1 answers · asked by Anonymous

I need help please!!!

2007-04-22 10:09:32 · 3 answers · asked by bleh in your face 1

2007-04-22 09:55:45 · 1 answers · asked by Javier L 1

and what is the difference between the Bohr model and the electron cloud model?

2007-04-22 09:41:54 · 4 answers · asked by sumit_kn 3

2007-04-22 09:41:42 · 1 answers · asked by Frankie L 1

What is the new volume?

2007-04-22 09:34:07 · 1 answers · asked by Frankie L 1

2007-04-22 09:22:41 · 2 answers · asked by randy_nephro 1

If 200mL N2 at 25 degrees celcius and pressure 400mmHg, and 200mL O2 at 25 degrees celcius and pressure 300mmHg are placed in a vessel with volume 700mL, what is the total pressure of the mixture (in mmHG)?

2007-04-22 09:09:39 · 4 answers · asked by Frankie L 1

2007-04-22 08:59:50 · 1 answers · asked by randy_nephro 1

its about chemistry kindly help plzz

2007-04-22 08:43:47 · 3 answers · asked by abc 1

2007-04-22 08:23:28 · 2 answers · asked by Jah 1

A mixture of 2.00 moles of H2, 3.00 moles of NH3, 4.00 moles of CO2 and 5.00 moles of N2 exerts a total pressure of 800 torr. What is the partial pressure?

Can you please includes steps on how to do this? So I will be able to do future problems!

2007-04-22 08:21:22 · 3 answers · asked by Azumi 2

When 1.50g Ba (s) is added to 100.00 g of water in a container open to the atmosphere, the reaction shown below occurs, and the temp of the resulting solution rises from 22 degrees C to 33.1 degrees C. If the specific heat of the solution is 4.18 J/g, calculate (triangle)H for the reaction as written.

Ba(s) +2 (water)(l) gives Ba(OH)2 (aq) +H2 (g)

any help?

2007-04-22 08:21:20 · 1 answers · asked by Anonymous

the substances are carbon disulfide, propane, carbon monoxide,trimethyl amine, acetic acid, nitric acid

the covalent bond has to be polar

2007-04-22 08:09:57 · 1 answers · asked by fat bastard 2

are they named after R. Buckminster Fuller or after the alkene "buckminsterfullerene??

2007-04-22 08:08:47 · 3 answers · asked by ELLEJAY92 2

2007-04-22 07:50:12 · 6 answers · asked by COOL KID 2

2007-04-22 07:48:48 · 4 answers · asked by fionanisirideain 1

oxygen. sulfur, seleium , tellenium, pollonium
thanx in advance

2007-04-22 07:34:20 · 2 answers · asked by Anonymous

please answer correctly

2007-04-22 07:28:11 · 1 answers · asked by Anonymous

Any help with the following problem will be appreciated thanks!
the molecular mass of KAl(SO4)2*12H2O is 474.22g

Given the following equation

KAl(SO4)2*12H2O+ 2BaCl2 ----> KCl + AlCl3 + 2BaSO4+ 12H2O

What is the percent yield of barium sulfate if 1.02 grams is produced?

If a 10 gram sample of alum is heated to drive off all of the water of the solid. determine the mass of the dehydrated alum.

2007-04-22 06:45:20 · 1 answers · asked by Anonymous

It's an exam question

2007-04-22 06:24:25 · 3 answers · asked by Shay F 1

Because Ka for HCO3 is 4.7x10^-11, Kb for the HCO3 is 2.1x10^-4

what makes this statement false?

2007-04-22 06:22:21 · 5 answers · asked by Anonymous

I read somewhere on some website that hydrogen bonds are the attraction between the hydrogen atoms of one H2O molecule and the oxygen atom of another, because the hydrogen atoms of the H2O molecule are positive and the oxygen atoms are negative. But if it is simply positive-negative attraction then what makes it unique to "hydrogen" does this occur with othe kinds of atoms of any other molecule? I dont understand why it is called "hydrogen bonds" if it is just attraction because of polarity!

2007-04-22 06:15:12 · 2 answers · asked by David U 2