Chemistry - December 2006

A vessel contains 2.00 mol of He, 5.50 mol of Ar, and 1.00 mol of CH4 gases. If the partial pressure of He is 1.440 atm, what is the total pressure inside the vessel?

2006-12-29 13:27:09 · 5 answers · asked by Domino 1

1. How does increasing the temperature of a solvent affect the solubility of a gas?

2. Explain why the temperature of water might increase when a solution forms.

3. Explain why crushing a solute increases the rate of solution.

4.Name and describe the three types of solutions.

5. Explain why oil does not dissolve in water.

6. Describe how you might increase the solubility of a solid in a liquid.

7. Explain how a solution can be both dilute and saturated.

8. Describe three different ways in which the concentration of a solution can be reported.

9. Define and give an example of an acid and of the base.

10.List the properties of acids and bases. Which of the properties of acids would you use to safely test whether an unknown substance was an acid or a base?

11. If you add hydrochloric acid (HCI) to magnesium (Mg) metal, what will you observe? What products form in this reaction?

12. Identify each of the following compounds as an acid, base, or salt: LiOH, H2CO3, Ba(OH)2, KCI.

2006-12-29 13:23:18 · 5 answers · asked by Ryoma Echizen 3

ANSWER AS MANY AS YOU CAN

1. The reaction between an acid and a base is called
a. ionization
b. neutralization
c. dissociation
d. dispersion

2. A solution of sodium hydroxide in water is most likely to have a pH close to
a. 14
b. 7
c. 5
d. 3

3. Substances that form ions when dissolved in water are
a. solutions
b. molecules
c.polar
d. electrolytes

2006-12-29 13:09:17 · 4 answers · asked by Ryoma Echizen 3

TRY AS MANY AS YOU CAN

1. The parts of a solution are the
a. salt vapor
b. solvent and solid
c. solute and water
d. solute and solvent

2. In a solution, the solute is the substance that
a. dissolves in the solvent
b. is in the greatest quantity
c. is the liquid
d. is a solid

3. Sugar dissolves in water through
a. ionization
b.dissociation
c. neutralization
d. dispersion

4. Ionic compounds produce ions in solution by
a. ionization
b.dissociation
c. neutralization
d. dispersion

5.The process by which some molecular compounds dissolve in water to form ions is
a. ionization
b.dissociation
c. neutralization
d. dispersion

6. The boiling point of a liquid solution is
a. the same as the boiling point of the solvent
b. the same as the boiling point of the solute
c. higher than the boiling point of the solvent
d. lower then the boiling point of solvent

7.Which of the following is NOT characteristic of an acid?
a. tastes sour
b. reacts with metals
c. turns litmus paper blue

2006-12-29 13:02:53 · 2 answers · asked by Ryoma Echizen 3

For a mixture of two gases, consisting of 1.50 mol of CF4 and 3.00 mol of H2, at a total pressure of 3.66 atm, what is the partial pressure of CF4?

2006-12-29 12:32:20 · 3 answers · asked by Domino 1

couple of days ago, i was watching K-19 The Widowmaker. I noticed that some crew members were contaminated with radiation, but, i didn't understand how Radiation contamination works.
Does anyone know how radiation contamination works? Which body parts are affected by it?

2006-12-29 12:18:18 · 5 answers · asked by JMG 2

if you can explain this it would help me out...a lot! doesn't it have to do with something with the orbitals?

2006-12-29 11:59:06 · 5 answers · asked by snoopy111690 1

"By turning the can upside down you trapped a lower volume of gas (because some escaped)and a reduced air pressure compared with what is on the outside (normal atmospheric pressure). "
Which law would explain this better: Charles law or Boyles law?

[Boyle's Law- For a given amount of a gas at a constant temperature, the volume is inversely proportional to the temperature.

Charles' Law- For a given amount of a gas at a constant pressure, the volume is directly proportional to the temperature.]

2006-12-29 11:12:07 · 6 answers · asked by Epitaph 2

Complete the word equation
Then write the balanced equation.
27. calcium + oxygen >>>>
28. copper(II) carbonate>>>>
29. aluminum + hydrochloric acid >>>>
30. potassium iodide + chlorine >>>>
31. barium chloride + sodium sulfate >>>>
32. copper + silver nitrate >>>> copper(II) nitrate +
33. barium hydroxide + sulfuric acid>>>>
34. zinc sulfate + ammonium sulfide>>>>
35. sodium + water >>>>
36. magnesium + sulfuric acid >>>>
37. Mercury(II) oxide >>>>

2006-12-29 10:45:09 · 5 answers · asked by truckin_90 2

Will there be a physical or chemical change?
Endothermic or Exothermic? Please explain and share with me your sources.

2006-12-29 10:42:55 · 9 answers · asked by JEANDB 2

2006-12-29 10:21:20 · 5 answers · asked by kverch123 1

i have a report due for distilation and i am doing an experiment, ditilling
H2O (WATER) NaCl (salt)
OH (alchhol) + H2O (water)
OH + NaCl
I wanted to know the equation for these since i need to type in the equation in the report.
THANKSSSS A LOTTT FOR THOSE WHO HELP ME OUT

2006-12-29 10:05:38 · 6 answers · asked by Anonymous

.1 L of .20M silver nitrate is mixed with .1 L of .15M calcium chloride.

The net ionic equation is :
2Ag(+) + Cl (-) -------------> 2AgCl

What are the concentrations of each ion
remaining in solution after precipitation is complete?
THANK YOU!!!

2006-12-29 09:43:39 · 5 answers · asked by kyle c 1

so i have to do a project does any body know another reaction of lithum besides that it reacts violently with water and does it have 3 neutrons because im not sure what is its electro negativity and what bonds does it form

2006-12-29 09:12:23 · 5 answers · asked by eddy 2

im going to extract the lipids out of different types of chocolate (milk, dark, white ect.) and since there is no such thing as "fat free" chocolate, any suggestions for a control?

2006-12-29 08:45:24 · 4 answers · asked by . 2

which of the following statements best describes what happens as nitrate ions (NO3-) are changed into nitrite (NO2-)

A. The nitrite ions are reduced

B. the nitrite ions are oxidized

C. The nitrate ions are reduced

D. The nitrate ions are oxidized



N2 + 3H2 ------> 2NH3
<-----

A. ammonia is a more stable substance than is N2 or H2

B. As NH3, Forms, some of its reverts back to N2 or H2.

C. All of the reactants are converted to products in the reaction

D. None of these


And as always thank you for all you do!!!!!!

2006-12-29 08:08:45 · 11 answers · asked by cetinnovations 1

2006-12-29 08:00:43 · 4 answers · asked by siva kesava raju 1

Hydrogen cyanide is produced industrially from the reaction of gaseuous ammonia, oxygen and methane: 2NH3(g) + 3O2(g) +2CH4(g) --> 2HCN(g) +6H2O(g)
if 5,000 kg each of NH3, O2, and CH4 are reacted, what mass of HCN and of H2O will be poduced (assuming 100% yield)

2006-12-29 07:45:20 · 2 answers · asked by kat g 2

For example, given n=2, l=1, ml= -1, and ms = -1/2 what would be the maximum amount of electrons? my book isn't clear on it. thanks for the help!

2006-12-29 07:41:15 · 4 answers · asked by sandcastlesinair 1

2006-12-29 07:27:02 · 6 answers · asked by Anonymous

a. they are not stronger. it is just that many ion-dipole attractions are stronger than just a few dipole-dipole attractions.
b. ions and molecular dipoles can get a lot closer than molecular dipoles can get to molecular dipoles.
c. the charge of an ion is much greater than the charge of a molecular dipole.
d. the electrons in a molecular dipole only congregate to one side.

2006-12-29 07:25:11 · 3 answers · asked by Anonymous

a. elements on the far left tend to form positive ions while those on the right tend to form negative ions.
b. elements on opposite ends of the periodic table have similar arrangements of electrons.
c. elements on the far left tend to form negative ions while those on the right tend to form positive ions.
d. elements on opposite ends tend to share a pair of electrons with each other.

2006-12-29 07:15:34 · 4 answers · asked by Anonymous

Given that at 10 degrees Celcius, 8.9 x10^-5 g of AgCl(s) will dissolve in 100 mL of water

2006-12-29 06:38:21 · 3 answers · asked by trakstar16 1

WHY?

2006-12-29 06:33:50 · 7 answers · asked by rebelchikrocker 5

You have two 500 mL aqueous solutions. Solution A is a solution of silver nitrate, and solution B is a solution of Potassium Chromate. The masses of the solute in each of the solutions are the same. When the solutions are added together, a blood-red precipitate forms. After the reaction has gone to completion, you dry the solid and find that it has a mass of 331.8g.
(a) calculate the concentration of the potassium ioins in the original potassium chromate solution.
(b) calculate the concentration of the chromate ions in the final solution.

2006-12-29 06:26:49 · 2 answers · asked by kat g 2

I need to do a Chemistry lab and cannot figure out how to even go about this question. Help Please!

2006-12-29 06:15:29 · 2 answers · asked by kat g 2

i heard that you can make the goo by mixing oil and alchohol together, but how do you color it, and how do you color the water it flots around in

(basicly what is the concept of coloring the goo inside of the lamp, and what can i use to rest it on a lamp or something)

and can the iol be vegetiable oil, and the alchohol be hydrogen proxide

if not where can i find these materials

2006-12-29 05:49:55 · 2 answers · asked by macgyver 1

How much heat will be transferred when 25.1 g of biborane B2H6 reacts with 57 g of oxygen according ot the following equation
B2H6(g)+3O2(g)--->B2O3(s)+3H2O enthalpy cahnge is -1940 kJ

How much heat is transferred when 8 g of Nitrogen N2 reacts with 15 g of hydrogen H2 according to teh following equation
N2(g)+3H2(g)--->2NH3(g) enthalpy change is 46.2 kJ

I am really stuck on these two problems so could you please help me

2006-12-29 05:43:44 · 2 answers · asked by silentcargo 3

can you write the eqetion

2006-12-29 05:37:35 · 4 answers · asked by Anonymous

I'm doing a science project on the affect of acids on different metals, and am wondering where I can get these metal cubes, other than from a hobby shop, and where I can get chemicals that would affect them.

2006-12-29 05:22:27 · 4 answers · asked by Anonymous