Chemistry - February 2007

This website says that there's a lower transition state for the endo approach, but it's not obvious why that's the case.
http://en.wikipedia.org/wiki/Diels-Alder_reaction

2007-02-07 18:08:58 · 1 answers · asked by Otis T 4

One Group Pretest - Posttest Non-equivalent Control Group Design

O1 X O2


O1 X O2 / O3 O4

WHAT AM I SUPPOSE TO DO TO ANSWER THIS PROBLEM? I DON'T UNDERSTAND. THANKS FOR YOUR HELP!

2007-02-07 18:06:37 · 3 answers · asked by Kim L 1

a) H2F+b) ethanoic acidc) H3O+d) H2SO4

Also if you can help with these too:

9. In the lowest energy chair conformation of trans-1,4-dimethylcyclohexane, how many axial positions are occupied by hydrogen atoms?

a) 2 b) 3 c) 4 d) 5 e) 6


10.Which of the following is the weakest Bronsted-Lowry base?

a) ClCH2CO2-b) CH3CO2-c) CH3CH2O-d) HO-e) H2N-

2007-02-07 18:00:49 · 2 answers · asked by tonythewombat 1

balance the chemical equation

2007-02-07 17:50:57 · 3 answers · asked by mingey s 1

2007-02-07 17:46:12 · 3 answers · asked by Anonymous

would the pH of a solution made by dissolving the following solds in water be less than 7, be equal to 7 or be greater than 7? explain
a) NaF (b) NaCl (c) AlCl3.... How do you figure this out? do you use the periodic table?

2007-02-07 17:43:46 · 3 answers · asked by jyoti b 1

Write a balanced chemical equation for the neutralization reaction of acetic acid and ammonia.

2007-02-07 17:29:47 · 3 answers · asked by wi1dw00ly 1

thank you!

2007-02-07 16:45:27 · 2 answers · asked by the guy 2

2007-02-07 16:40:46 · 6 answers · asked by ? 1

2007-02-07 16:37:06 · 3 answers · asked by Anonymous

2007-02-07 16:25:38 · 8 answers · asked by supabebe 1

Can someone explain to me how to do this? Thanks!!!!

2007-02-07 16:16:43 · 4 answers · asked by Anonymous

11th grade chemistry question. Having trouble finding answer.

2007-02-07 16:14:51 · 3 answers · asked by lacybsmom 2

2007-02-07 16:05:21 · 1 answers · asked by The One 1

1. C6H12O6 (glucose)
2. C7H12 (heptine)
3. NaHCO3 (Sodium BiCarbonate)
4. KNH4SO2

2007-02-07 16:01:45 · 3 answers · asked by m C 1

websites or personal info
the element is Carbon

2007-02-07 16:00:42 · 3 answers · asked by sonic_brain3 2

(NH4)2CO3 ==========> NH3 + H2O + CO2

2007-02-07 15:47:38 · 5 answers · asked by bambam4289 1

This is an algabra question in chemistry language. I do not know how to find two unknowns.

2007-02-07 15:46:19 · 5 answers · asked by Melanie W 1

I need a twelve letter word for the quantity of heat required to raise a unit mass of material 1K or 1C

2007-02-07 15:41:21 · 5 answers · asked by The Answerer 2

plz help me...

2007-02-07 15:39:48 · 1 answers · asked by urlast2003 1

once witness people get drunk with liquid hand soap,how is alcohol removed from diffrent liquid

2007-02-07 15:32:46 · 2 answers · asked by never new y 1

When you test for Hydrogen gas, another gas is involved as a reactant. What is this gas?

2007-02-07 15:18:08 · 1 answers · asked by Anonymous

I'm having trouble on this question. Any help would be appreciated.

The equilibrium constant for the reaction
AuBr4- + 2Au(s) + 2Br- <--> 3AuBr2-
can be determined by preparing a solution of AuBr4- and AuBr2- in contact with a piece of gold metal. The absorbance of the solution due to AuBr4- is measured at 382 nm. In one experiment, a solution containing a total of 6.41 x10-4 mol/L of dissolved gold (both AuBr4-, AuBr2-) in .4 M of hydrobromic acid was at equilibrium in the presence of gold metal. The total absorbance was found to be .445 in a 1.0 cm cell at 382 nm; however, AuBr2- does not absorb at 382 nm.
In a seperate experiment, the absorbance of 8.54x10-5 M solultion containing only AuBr4- (no AuBr2-) in .4 M HBr was determined in a 1.0 cm cell to be .41 at 382 nm.

1. Calculate the equilibrium concentrations of AuBr4- and AuBr2-.
2. Evaluate the equilibrium constant for the reaction.

2007-02-07 15:11:28 · 1 answers · asked by Anonymous

2007-02-07 15:04:52 · 10 answers · asked by kingdom 1

A piece of unknown metal has a width of 3.2cm, a length of 17.1cm and height of 4.6cm. Its mass is 1.4kg. Calculate the density of the metal. Express your answer in grams per cubic centimeter using two significant figures.

I have a test in the morning and really need to know how to do this and not just the answer. Hopefully you can help me... Thank you so much! :)

2007-02-07 15:04:36 · 2 answers · asked by Anonymous

Two other examples of complexing agents are Cl- and CN-. Write the net ionic equation for the following.

Iron(II) ions react with cyanide ion, CN-, in aqueous solution to form the complex, Fe(CN)6^4- (aq)

2007-02-07 15:00:43 · 2 answers · asked by Alan l 1

I'm a woodturner and I've made a tool out of A2 tool steel. I'd like to know how to harden it and anneal it. I also need to be able to use a shop torch if possible. Thanks!!

2007-02-07 14:45:45 · 3 answers · asked by Gina P 2

i need it for a lab report due tomarrow :O

2007-02-07 14:33:06 · 3 answers · asked by pooper scooper 1

2007-02-07 14:25:48 · 3 answers · asked by krebsgirl18 1

For the following descriptions of a metathesis reaction, write the molecular, ionic and net ionic equations.

A precipitate of lead(II) chloride is observed to form when solutions of lead (II) nitrate and ammonium chloride are combined.

2007-02-07 14:18:08 · 2 answers · asked by Alan l 1