Chemistry - February 2007

2007-02-05 10:09:44 · 8 answers · asked by Mar 1

PCl5 (g) ---> PCl3 + Cl2

for the reaction above, delta H = +22.1 kilocalories per mole at 25 degrees celcius.

a. does the tendency of reactions to proceed to a state of minimum energy favor the formation of the products of this reaction? explain

b. does the tendency of reactions to proceed to a state of maximum entropy favor the formation of the products of the reaction? Explain

c. state whether an increase in temperature drives this reaction to the left, to the right, or has no effect.
Explain

d. State whether a decrease in volume of the system at constant temperature drives this reaction to the right, to the left, or has no effect. Explain

2007-02-05 09:49:38 · 3 answers · asked by soccer l 1

From the following:

pure water
.01m C12H22O11 solution in water
.01 m NaCl in water
.01 m CaCl2 in water

choose the one with:

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

I need to check my answers, I'm not sure if they're right. Thanks!

2007-02-05 09:40:57 · 1 answers · asked by Wael K 2

2007-02-05 09:30:01 · 1 answers · asked by Anonymous

2007-02-05 09:26:11 · 2 answers · asked by frickenawesomekoreanandyouknowit 2

2007-02-05 09:25:27 · 2 answers · asked by frickenawesomekoreanandyouknowit 2

Which of the following compounds is hydrophobic
a, hemoglobin
b. glucose
c. RNA
d. glycerol
e. amino acid

2007-02-05 09:23:16 · 2 answers · asked by Halston R 1

I need Help on my Homework and I don't understand these problems:
1/2, 1/6, 3/4, 15/16, 5/2,.= Fractions
What are the answers to all of these?

2007-02-05 09:14:48 · 6 answers · asked by Nathan C 1

A 100 g sample of water at 90 degrees C is added to a 500 g sample of water at 10 degrees C. what is the final temperature?

2007-02-05 09:12:08 · 1 answers · asked by cheernhorserm 1

2007-02-05 09:08:36 · 1 answers · asked by Anonymous

2007-02-05 09:04:21 · 3 answers · asked by Mandy 1

2007-02-05 08:47:33 · 5 answers · asked by Anonymous

okay so if i have 1.05=3.1424/.0821T
how do i get T?

hahha im embarrased, i must say.

2007-02-05 08:45:14 · 1 answers · asked by Anonymous

2007-02-05 08:27:52 · 4 answers · asked by Jalousie JK 1

it is a redox titration. using a measuring cylinder to add iodide ions in excess (gotten from potassium iodide) and sulphuric acid to get iodine in a conical flask, it is titrated with an oxidant X

2007-02-05 08:26:13 · 2 answers · asked by lilamy 1

Colloidals are stablilized by maximizing the surface area in contact with the surrounding liquid relative to the volume of the nanoparticle. compare the ratio of the particle surface area (in nm^3) for nanospheres having diameters of (a) 20nm and (b) 100nm. The volume and surface area of a sphere can be calculated from the equations below. Nanospheres of which size would form the most stable colloid?

Area=4pie r^2 Volume= 4/3pie r^3

2007-02-05 08:16:07 · 1 answers · asked by pinkpanthergirl 1

How many molecules of water are formed when the following equation is balanced?
Al2O3+HCI---I--- AICI3+H20
1)1
2)2
3)3
4)4
5)6

2007-02-05 08:11:54 · 7 answers · asked by Anonymous

The ferrofluid synthesis involved preparation of a colloidal suspension.

What is a colloidal suspension?

2007-02-05 08:11:39 · 5 answers · asked by pinkpanthergirl 1

Help......I have'nt taken chemistry in years (31 to be exact) & now that I am in a class...I am in over my head. I have read up on how to balance equations but don't know what to do with this...please help.........

how would I write a balanced equation for this..........

sodium sulfate + barium chloride = barium sulfate..........

thanks for any help that you provide.......

2007-02-05 08:07:30 · 3 answers · asked by clueless 2

cesium fluoride has a melting point of 682 and a solubility of 386 kg/kg h2o at 25 degrees. explain the difference between the properties of CsF and NaF which has a melting point of 988 and a solubility of 0.042

2007-02-05 08:00:53 · 1 answers · asked by cutie pie! 3

What is the chemical formula for sulfur hexafluoride?

2007-02-05 07:44:23 · 6 answers · asked by garture 1

2007-02-05 07:17:02 · 13 answers · asked by Jason K 1

why does water freeze and melt at 0ºC?

2007-02-05 07:03:00 · 5 answers · asked by emy_015 2

2007-02-05 07:01:39 · 7 answers · asked by ld 1

different acids are placed in many bootles without any label so how we distinguish among them in short period of time?

2007-02-05 07:00:50 · 1 answers · asked by saadia a 1

2007-02-05 06:38:30 · 4 answers · asked by Anonymous

2007-02-05 06:37:01 · 6 answers · asked by JOHNWP 1

2007-02-05 06:19:16 · 4 answers · asked by jon & Corrie A 1

2007-02-05 06:15:53 · 2 answers · asked by jeje_candy1991 1

this is for a chemistry class and I was thinking Hydroxyl group... is that right?

2007-02-05 06:13:12 · 4 answers · asked by Ashlee 3