Chemistry - November 2007

∆G = ∆H - T∆S

Explain the effects of ∆H and ∆S

2007-11-16 22:46:49 · 3 answers · asked by vangie d 1

the procedure to my experiment is:
-2 grams of PREVIOUSLY HEATED CuO and a corn-grain amount of sugar were grinded in a mortar.
-The mixture was transferred in a test tube and covered with a rubber stopper with bent glass tubing.
-The test tube was attached to an iron stand in an inclined position, and the other end of the glass tubing was immersed in 5ml Lime water.
-The test tube with the grinded mixture was heated with a bunsen burner.

2007-11-16 22:45:28 · 1 answers · asked by evil_tama 2

C6H6 + CH2=CH-CH2-Cl------>???

2007-11-16 22:34:53 · 1 answers · asked by Anonymous

2007-11-16 17:19:44 · 1 answers · asked by kyforsberg 1

What mass of iron splints and 87% (by mass) H2SO4 were needed to ensure the complete filling of the balloon? Assume a temperature of 0°C, a pressure of 1.0 atm during filling, and 100% yield.

the equation is
Fe + H2SO4->FeSO4 + H2

answer in kg please :)

2007-11-16 15:49:14 · 1 answers · asked by Anonymous

I want to use a helium tank I have had for awhile. Does anyone know if there is a way to know how much helium is left in a tank. Also does it ever go bad?

2007-11-16 14:50:14 · 3 answers · asked by Anonymous

i mean hello i am doing a project and i dont know what it is

2007-11-16 14:02:40 · 5 answers · asked by Cindi G 1

If freezing point depression is based on colligative properties, meaning the concentration of the solute and not its chemical identity determine how much the freezing point is lowered. Then why, for example, is calcium chloride more effective than sodium cholride at melting water?

2007-11-16 13:04:44 · 2 answers · asked by Anonymous

would effect the answers?

2007-11-16 12:51:06 · 1 answers · asked by Ammie 1

A mixture of potassium chlorate and sodium chlorate has a mass of 7.5000 grams. When this mixture is heated to decompose it, the mass of the residue that remains after heating is 4.3091 grams. Determine the percentage of potassium chlorate in the original mixture. The balanced chemical equations for the reactions that occur during the heating are:



2 KClO3(s)→ KCl(s) + 3 O2(g)

2 NaClO3(s)→ 2 NaCl(s) + 3 O2(g)

2007-11-16 12:29:37 · 1 answers · asked by arturo 3

your personal opinion. thanks

2007-11-16 12:13:25 · 2 answers · asked by jamet002 2

2007-11-16 12:06:21 · 2 answers · asked by Anonymous

If not, is it a compound (or are they the same thing)?

2007-11-16 11:48:21 · 5 answers · asked by Chris 2

a ridgid 8.2L flask contains a mixture of 2.5 moles of h2 , .5 mol of O2 and sufficent Ar so that the partial pressure of Ar in the flask is 2.00 atm. the temp is 127 C.

a. calculate the total pressure in the flask
b. calculate mole fraction of H2 in the flask
c. calculate density ( in g L-1) of the mixture in the flask

the mixture in the gas is ignited by a spark, and the reaction represented below occurs untill ne of the reactants is completly comsumed.

2H2 (g) +O2 (g) ----> 2H2O(g)

d. give the mole fraction of all species present in the flask at the end of the reaction.

2007-11-16 11:46:23 · 3 answers · asked by Help?? 2

6Mg + P4 ---> 2Mg3P2

I have 2.5 moles of Mg. How many moles of P4 do I need in this reaction to completely use up all of this Mg?




4Cu(s) + O2(g) ---> 2Cu2O(s)

How many grams of Cu2O will be produced if I react 4.8 grams of copper metal with excess oxygen gas?

2007-11-16 11:10:05 · 1 answers · asked by <3 1

I know you can add aspirin to diionized water to make it ionized. I'd like to find out what I can add to diesel to make it ionized.

Suggestions?

thanks
john

2007-11-16 11:08:49 · 3 answers · asked by John B 1

The water is the only exception to a rule. All the solids sink in their liquids.

2007-11-16 10:31:33 · 5 answers · asked by Anonymous

2007-11-16 10:13:57 · 5 answers · asked by Anonymous

2007-11-16 09:55:59 · 2 answers · asked by blueeyegreen 1

The ph of 0.1 M HClO2(chlorous acid) aqueous solution was measured to be 1.2. What is the value of pKa for chlorous acid?

1.2.57

2. .11

3. 3.91

4. .96

5. 1.40

6. 1.20

2007-11-16 09:53:42 · 3 answers · asked by yakov59 1

calculate how many moles of the second reactant would be required to react completely with 5.00 mol of the first reactant

C2H6(g) + O2(g)-->CO2(g) + H2O(g)

all numbers are supposed to be subscripts.

Please explain how to get the answer if you can! cuz i don't understand it at all! thanks

2007-11-16 09:48:28 · 3 answers · asked by Anonymous

2007-11-16 09:30:49 · 4 answers · asked by Matt P The sexy Genius 3

(a) Use Boyle's law to calculate the volume the gas will occupy if the pressure is increased to 1.77 atm while the temperature is held constant.
______________________ Liters


(b) Use Charles's law to calculate the volume the gas will occupy if the temperature is increased to 167°C while the pressure is held constant.
_________________________ Liters

2007-11-16 09:24:19 · 1 answers · asked by Anonymous

2007-11-16 09:18:39 · 30 answers · asked by maryjane 2

I have a list of elements I need the electron domain and molecular geometries of. I got most of them, but there are a few I am stumped on.
H3O+
XeF4
SF6
SnCl3-

2007-11-16 08:50:36 · 6 answers · asked by Lance 2

how does a substance, such as glass, become the same temperature of the substance it is being heated or cooled in for about eight to ten minutes?
what is the name of this property?





******ADDITIONAL IF YOU DO NOT UNDERSTAND WHAT I AM ASKING OF YOU**********
if you do not understand the the first part of the question, i have provided an example below:
if i was heating a beaker with glass enclosed in it (through rubber stopping or suctioning) by completely submerging the beaker into the water bath, how does the beaker, then obtain the same temperature as the water bath within eight to ten minutes? could you please make sure to tell what the name of this property is called?





THANK YOU EVER SO MUCH!!!!:)
I OFFER MUCH GRATITUDE TO YOU!

2007-11-16 08:45:49 · 2 answers · asked by Anonymous

2Ag+ + Zn = 2Ag + Zn2+

Calculate the standard free energy change in kJ/mol for the above cell reaction

2007-11-16 08:45:18 · 2 answers · asked by Anonymous

Total ammonia nitrogen in waste water discharges comprises ammonia nitrogen (NH3-N) and ammonium nitrogen(NH4+-N). If pH and temperature of the wastewater discharge are 8 and 25degC, calculate the % of each of thes two forms of nitrogen in the wastewater. K is 1.82 EXP -5

2007-11-16 08:23:00 · 1 answers · asked by Tilly G 1

I'm doing a report on nitrogen and i really need an A.

2007-11-16 08:03:16 · 6 answers · asked by Anonymous

In the coordination compound [Pt(NH3)2Cl2], the coordination number and oxidation number of the central atom are, respectively,
a. 2, 0.
b. 4, +4.
c. 5, 0.
d. 4, +2.
e. 6, +2.

2007-11-16 08:01:50 · 4 answers · asked by Anonymous