Chemistry - March 2007

What observations by Rutherford led to the hypothesis that atoms are mostly empty space, and that almost all of the mass of the atom is contained in an atomic nucleus?

2007-03-28 07:33:51 · 1 answers · asked by chrissylee777 1

I'm not sure what the difference is and would like to know!

2007-03-28 07:28:31 · 4 answers · asked by Ran-Ran 1

2007-03-28 07:26:10 · 5 answers · asked by Anonymous

2007-03-28 07:11:22 · 2 answers · asked by Robert V 1

plz help

2007-03-28 07:07:43 · 5 answers · asked by Dre B 1

1. 0.50M acetic acid
2. 0.050M acetic acid
3. 0.0050M acetic acid

2007-03-28 06:52:41 · 3 answers · asked by Wonder 2

I'm looking for papers or processes concerning converting waste products of shrimp, crab, lobster, etc into gelatin. thanks

2007-03-28 06:46:57 · 1 answers · asked by rick m 6

2007-03-28 06:31:51 · 1 answers · asked by zerald 1

I know that a scale regarding how many hours you have is normally used, but what's the breakdown of it?

2007-03-28 06:29:36 · 3 answers · asked by kleiny212003 1

Acetic acid is an important ingrediant in vinegar. The formula is CH3COOH. How many hydrogen atoms are in the formula?

2007-03-28 06:28:42 · 6 answers · asked by ladona c 1

I am completely lost when it comes to tet-ionic equations for hydrolysis. So if anyone could help I would really appreciate it =) Thanks a lot!

NaC2H3O2(sodium acetate)
NH4Cl(ammonium chloride)
ZnCl2(zinc chloride)
KAl(SO4)2(potassium aluminum sulfate)
Na2CO3(sodium carbonate)

2007-03-28 06:26:05 · 1 answers · asked by Parry 1

Given the following:
0.200M NH3(aq) with pKb = 4.76
0.200M HC2H3O2(aq) with pKa = 4.76
0.200M NaOH(aq)
0.200M HCl(aq)
A mixture is made using 50.0 mL of the HC2H3O2 and 50.0 mL of the NaOH. What is its pH?

2007-03-28 06:02:28 · 2 answers · asked by Ryan C 1

i asked questions yesterday but i really don't get this stuff because there is a variety of ways for the wording of these molarity equations and it's confusing! i just have two more...like please help me set it up step by step if u can.

what mass of K3PO4 is required to prepare 4.00 liters of 1.50M solution?

a solution of (NH4)2SO4 is to be prepared that is 2.25M in NH4+. What volume of solution can be produced using 50.0 g (nh4)2SO4?

and also....what is the answer to "how many liters of a 0.5M sodium hydroxide solution would contain 2 moles of solute?" i had that question a quiz and got it wrong!!\
thank you.

2007-03-28 05:42:44 · 2 answers · asked by Jen R 1

2007-03-28 05:29:24 · 4 answers · asked by Chicken Noodle 2

(electromotive force) in volts, and (B) the standard free energy change in kJ/mol, for the following cell reaction:

2Ag+ + Zn = 2Ag + Zn2+

2007-03-28 05:13:43 · 3 answers · asked by Paul C 1

How can we accertain if the bottle of chloroform kept for a long time is still usable? We will know milk is bad when it's curdled and smells bad....but how are we to know if the chloroform is still ok for usage?

2007-03-28 05:11:34 · 6 answers · asked by q-rious damsel 1

in volts for the following cell reaction:

2Ag+ + Zn = 2Ag + Zn2+

2007-03-28 05:10:55 · 2 answers · asked by Paul C 1

2007-03-28 04:52:42 · 5 answers · asked by lauren 2

2007-03-28 04:31:28 · 8 answers · asked by Anonymous

H-D exchange of peptide in D2O is rapid and the reaction is quenched with pH 2.2. What would happen if we use acetronitrile solution at pH 2.2 then dry the mixture say within 10 sec? Will this reaction stop? What is the known rate of H-D exchange in crystal at room temperature?

2007-03-28 04:20:59 · 1 answers · asked by jjnbdal 1

Is Heptane soluble in water, acetone, and ethanol?

Is Hexene soluble in water, acetone, and ethanol?

Is toluene soluble in water, acetone and ethanol?

I did these experiments and found that all three were insoluble in water, and all three were soluble in acetone and ethanol, but I was told those answers were wrong! If anyone knows, please let me know too. Thanks

2007-03-28 03:58:51 · 0 answers · asked by Angel Eve 6

what is the decomposition equation of H2SO4 when a 9V battery is used.

2007-03-28 03:50:21 · 3 answers · asked by Djoanna Maria T 1

how do you make soap using oil and some other alkaline? and what alkaline

2007-03-28 03:47:41 · 5 answers · asked by Anonymous

something to do with the lowest temp. in which a vapor will ingnite

2007-03-28 03:45:58 · 9 answers · asked by Boss Hog Entertainment 1

2007-03-28 03:30:04 · 4 answers · asked by shortydidi03 2

(Use the reaction free energy given below.)


2SO3 = 2SO2 + O2 in the gaseous state


ΔGo = 140.0 kJ/mol



Explaining how the answer was derived would be greatly appreciated!!!

2007-03-28 03:24:08 · 3 answers · asked by Anonymous

An aspiring tablet is boiled in an attempt to dissolve an aspirin tablet which weighs 392 mg for several minutes. Titration of .050M NaOH requires 44.37mL. What is the apparent %ASA in the tablet. Is there a problem here? If so, what is likely to have happened?

(Hint: can't use the EMM formula (Effective Molar Mass) (Molar mass of Aspirin: 180.15 g, pKa= 3.50) (Molar mass of salicylic acid is 138.12 g, pKa=2.99)

2007-03-28 02:41:07 · 1 answers · asked by horn.nicole 2

2007-03-28 02:23:42 · 5 answers · asked by Sally Khoo 1

Using a table of standard reduction potentials calculate the standard cell potential (electromotive force) in volts

for the following cell.


Fe + F2 = Fe2+ + 2F−

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

Enter a numeric answer only

2007-03-28 02:21:27 · 3 answers · asked by mahbubur r 1

Philosophy

2007-03-28 02:19:41 · 3 answers · asked by Anonymous