Chemistry - November 2007

2007-11-30 19:59:46 · 2 answers · asked by rockabilly.betty 2

2007-11-30 19:57:41 · 1 answers · asked by wants all the answers 1

of order. Which of the following is the best explanation of how this process can be compatible with the Second Law of Thermodynamics?

Answer choices:
1. Heat is flowing out of the system reversibly, so it is allowed.
2. A higher degree of order means an increase in entropy, which is exactly what the Second Law requires.
3. The surroundings are undergoing changes in the direction of greater disorder.
4. Since no chemical change is taking place, the degree of order is not relevant.
5. Since the process is not occurring at 0 Kelvin, the Second Law is not relevant.

2007-11-30 18:39:59 · 2 answers · asked by Anonymous

molecule of what common substance belong to the same group as BF2Cl?

2007-11-30 18:02:28 · 1 answers · asked by Anonymous

2007-11-30 15:01:31 · 2 answers · asked by herliati2004 1

I need atleast 2 to 3 reasons why reagents are called primary standards...any help? I have a final tomorrow. Please answer quickly. Thank you.

2007-11-30 14:51:42 · 2 answers · asked by Big Jay 3

Nitroglycerin, an explosive compound, decomposes according to the equation below.
4 C3H5(NO3)3(s) 12 CO2(g) + 10 H2O(g) + 6 N2(g) + O2(g)

Calculate the total volume of gases when collected at 1.2 atm and 25°C from 1.9 102 g of nitroglycerin.

Molar mass of nitroglycerin is 227.0872

2007-11-30 14:24:40 · 4 answers · asked by lynn_nguyen00 2

Calcium-39 undergoes positron decay. Each positron carries 5.49 MeV of energy. How much energy will be emitted when 0.0025 mol of calcium-39 decays?

2007-11-30 14:16:01 · 2 answers · asked by Anonymous

1. Br2 + 2e- ---> 2Br-

2. Na ---> Na+ + 1e-

3. Na+ + 1e- ---> Na

4. 2Br- ---> Br2 + 2e-

5. 2H2O + 2e- ---> 2OH- + H2

2007-11-30 13:40:20 · 2 answers · asked by LovelyLady 3

1. the net redox reaction

2. combustion

3. reduction

4. oxidation

2007-11-30 13:37:03 · 1 answers · asked by LovelyLady 3

A person accidentally swallows a drop of liquid oxygen, 02 (l), which has density of 1.149 g/mL. Assuming the drop has a volume of 0.050 mL, what volume of gas will be produced in the person's stomach at a body temperature of 98.6 degrees F and a pressure of 1.0 atm?

2007-11-30 13:36:30 · 3 answers · asked by confused44 1

Concentrated hydrogen peroxide solutions are explosively decomposed by traces of transition metal ions (such as Mn or Fe):

H202 (aq) --> 2H2O (I) + O2 (g)

What volume of O2, collected at 27 degrees C and 746 torr, would be generated by decomposition of 125 g of a 50.0% by mass hydrogen peroxide solution?

2007-11-30 13:33:00 · 2 answers · asked by confused44 1

a) ethanol
b)butanol
c)glycerol
d)benzyl alcohol
e)phenol
f) diethylether

2007-11-30 13:32:35 · 1 answers · asked by Marsymallows 2

5. Complete the following nuclear reactions and name the decay process that is occurring in each:

a. 47Ca - > 47Sc + ?
b. 235U -> 4He + ?
c. ? -> 11B + 0-1e
d. 0-1e + ?-> 40Ar

2007-11-30 13:31:32 · 2 answers · asked by jennifer 2

Z1) In electrolytic cells, the flow of electrons is spontaneous.
Z2) In electrolytic cells, the electrons flow in the external circuit (through the wire) from the anode to the cathode.
Z3) In the electrolytic cells, the cathode is the negative electrode.

Which of the following is true?

1. Z1 and Z3 only

2. Z1 only

3. Z2 and Z3 only

4. Z1, Z2 and Z3

5. Z3 only

2007-11-30 13:28:25 · 1 answers · asked by LovelyLady 3

1. Na+ + 1e- ----> Na

2. 2H2O + 2e- ---> 2OH- + H2

3. Br2 + 2e- ---> 2Br-

4. Na ---> Na+ + 1e-

5. 2Br- ---> Br2 + 2e-

2007-11-30 13:25:35 · 2 answers · asked by LovelyLady 3

Two moles of an ideal gas initially at 224K and 0.55 atm are compressed to 1.55 atm. I have to find the final volume of the gas so first I found initial volume 67.72 then I found the final volume which was 0.024 in m^3 and I used 8.31451 as R and would it make a difference if it's an isothermal process?

2007-11-30 13:24:58 · 2 answers · asked by Shane 1

ammonium sulfate? The teacher gave my niece this question as part of an assignment. I am at a loss.
Any help would be appreciated, thanks!

2007-11-30 13:22:36 · 4 answers · asked by TygerLily 4

2007-11-30 12:35:41 · 7 answers · asked by tessababy992006 1

Two moles of an ideal gas initially at 224K and 0.55 atm are compressed to 1.55 atm. I have to find the final volume of the gas so first I found initial volume 67.72 then I found the final volume which was 0.024 but it's not right and I don't know what I'm doing wrong.

2007-11-30 12:30:41 · 2 answers · asked by Shane 1

How could you separate a mixture of sugar and white sand? What time of material do you use to to separate it?

Thanks for all the answers! You all are so nice to help people out like this. :]

2007-11-30 12:23:26 · 4 answers · asked by Starry-Ness 2

what is tin's freezing point, and its physical state at room tempreature

2007-11-30 12:11:25 · 3 answers · asked by Anonymous

I got werd question when your tutuor ask you a question about chemistry and you cant answer is because I just suck at chemistry because I need to learn more. Its like i cant think the chemistry thru? Like the mind set is not there to know the in and outs of chemistry?

2007-11-30 11:58:21 · 3 answers · asked by Steven V 2

it says solve each compound equality. State the solution set using interval notation and graph it

2007-11-30 11:50:11 · 5 answers · asked by shelah v 1

The blocks of paraffin wax, that can be melted later.

2007-11-30 11:25:19 · 4 answers · asked by Anonymous

I came upon this in trying to solve for molar mass in a problem. The Ideal gas law was re-arranged to molar mass=dRT/P. or P=mass/molar mass x RT/V Where mass/V=d. I just dont understand how n=mass/molar mass.

2007-11-30 07:44:45 · 7 answers · asked by James K 1

How much heat must be added to 528 g of copper at 22.3'C to raise the temperature to 49.8'C?

Copper=0.385 J/g 'C

2007-11-30 06:28:34 · 2 answers · asked by Anonymous

2007-11-30 06:08:58 · 1 answers · asked by Anonymous

if i ingest 3 moles of glucose molecules, how many CO2 molecules will i exhale???

2007-11-30 05:54:53 · 3 answers · asked by blueeyegreen 1

2007-11-30 05:26:24 · 5 answers · asked by bfly 3