Chemistry - April 2007

okay if you put water in a partial vacuum where the atmosphere is reduced a little then the boiling point of the water will be reduced.........is this correct? and if you lower the pressure enough inside or remove enough air then the boiling point will get very near the freezing point. when water boils it turns to a gaseous state and gives up and absorbs thermal energy very quickly......or at least faster then it would if it was a liquid.....am i correct. it is true that if air is in a vacuum that is has half the pressure then what is outside it the air inside the vacuum will balance out and become the same temp as the air outside the vaccum even though it is half the pressure.

2007-04-01 07:19:48 · 1 answers · asked by Anonymous

2007-04-01 07:04:22 · 6 answers · asked by sweetie 1

(1) less than the rate of the reverse reaction
(2) greater than the rate of the reverse reaction
(3) equal to the rate of the reverse reaction
(4) unrelated to the rate of the reverse reaction

2007-04-01 06:51:45 · 4 answers · asked by joey d 1

a. lowering of melting point and boiling point when a compound is formed
b.a tendency in nature to achieve a minimum energy for a system
c.the formation of a shape sonsistent with VSEPR theory
d.a tendency to make the attractions equal to the repulsions between atoms
e. a rtendency to reduce the # of exist particles

2007-04-01 06:49:52 · 7 answers · asked by sharareh 1

(1)the concentration of products and reactants is equal
(2) the concentration of the products and reactants are constant
(3) the rate of the foward reaction is less that the rate of the reverse reaction
(4) the rate of the foward reaction is greater that the rate of the reverse reaction

is the answer 2?

2007-04-01 05:58:58 · 6 answers · asked by mike 1

tell me everything you know about the element lead.

2007-04-01 05:54:33 · 4 answers · asked by illdaretofly 2

what is hexavelent chromium's density, melting point, boiling point, and reactivity

2007-04-01 05:52:31 · 2 answers · asked by tubes 1

For example, sugar.

2007-04-01 05:30:31 · 6 answers · asked by jimmi_323 1

2007-04-01 04:58:56 · 4 answers · asked by mike 1

2007-04-01 04:21:33 · 1 answers · asked by 8 3

also how they could be distinguished.

this is a coursework question i got last week however due to time shortage i was not able to ask before handing it in so i want to see if i got this question right or not.

thanks for ur help.

2007-04-01 04:13:58 · 4 answers · asked by aka sweety 1

well, i have to know what i need to get to make a volcano model for my assignment.


can you guys help me??????

2007-04-01 03:47:54 · 2 answers · asked by Anonymous

Ag2CrO4(s)-->reversible reaction<----2Ag^1+ + CrO4^2-

2007-04-01 03:33:25 · 4 answers · asked by mike 1

what would happen if i mixed these together H2SO4 and HNO3 ?

2007-04-01 03:27:39 · 4 answers · asked by .~`A88H`~. 1

Calculate the initial temp. of a 15.0 g piece of Cu if placing it in 75.00 g of water raises the temp. from 22.0 degrees celsius to 35.5 degrees celsius. This is what I did, first i found the heat using (q=m*C_s*change in temp.) for mass i used 15.0 + 75.00, i used the specific heat of water, and temp change was 22-35.5= -13.5, so for heat i got -5083.56 J (is that right?) Then I used the same eq. to find initial temp of Cu, my heat (q) was -5083.56J, mass was just mass of Cu 15.0 g, I used specific heat of water (4.184J/g*C), and my change in temp. (this is where i'm not sure i did it right) for final temp i used -13.5 - initial temp, and solved for intial temp. my answer was 65.5 C. Will someone please let me know if i'm right. If i'm not can you please explain to me how i get the answer. Thank you.

2007-04-01 03:02:24 · 3 answers · asked by me of course 2

2007-04-01 02:58:29 · 4 answers · asked by mimi j 1

Sodium bisulfate dissolved in water is highly acidic. The chemical formula is: NaHSO4 (aq)

How would this react with 1. Magnesium 2. Magnesium carbonate and 3. Magensium oxide ?

I would be very grateful if someone could show chemical equations for possible reactions as well as ionic equations.

Many thanks...

2007-04-01 02:54:10 · 1 answers · asked by St!th 1

why they don't represent the same valence?

2007-04-01 02:51:34 · 3 answers · asked by Anonymous

2007-04-01 02:35:59 · 11 answers · asked by Anonymous