Science & Mathematics - 28 October 2007

i am planning to hydrolyse glycerol triethanoate and then see how changing the concentration of the enzyme affects the rate of the reaction.
i am using the enzyme lipase.
what would be the best way to do this?
im not sure if i should use the method of saponification because then my catalyst would be NaOH as opposed to lipase.
there is also a titration involved in this which includes making a standard solution, but im not sure what my standard solution should be and why exactly i need to do a titration.
can someone please help me with this? ive somehow got myself REALLY confused!
thank you

2007-10-28 09:37:52 · 1 answers · asked by Anonymous in Chemistry

the principles with the proton-transfer reaction stuff are relatively simple but in certain equations how do you know what the base will be and what the acid will be?

like in this one water is the acid while ammonia is the base

NH3 (AQ) + H20 (L) ===> (BACK AND FORTH ARROW) NH4+ (AQ) + OH- (AQ)

Ok I get why they say that H20 is the acid, but if you weren't given the products, how would you know which one would transfer the proton and which one would accept it? cause otherwise i have no idea how to find the products. Thanks in advance.

2007-10-28 09:37:00 · 1 answers · asked by Anonymous in Chemistry

Why does our univerve contain these , and what are they doing out there ?

2007-10-28 09:35:59 · 7 answers · asked by Godzilla Gal 4 in Astronomy & Space

2007-10-28 09:35:51 · 2 answers · asked by Calif_Girl 5 in Biology

If my cell phone battery is completely dead, how much will it cost to charge it (if the battery is 2000 MaH?) Basically, how many 'units' of electricity will it take to fully charge the phone?

2007-10-28 09:35:15 · 2 answers · asked by Johnny 3 in Physics

2007-10-28 09:34:44 · 2 answers · asked by Anonymous in Mathematics

2007-10-28 09:34:18 · 1 answers · asked by max t 1 in Chemistry

How did you arrive at that conclusion?

2007-10-28 09:33:20 · 1 answers · asked by Calif_Girl 5 in Biology

The potential for micro-organisms to cause disease depends on the number of organisms, virulence, ability to enter and survive in a host and susceptibility of the host. Potter and Perry 3rd edition.

thank you for taking the time to help me out.

2007-10-28 09:31:12 · 4 answers · asked by Anonymous in Biology

I want to know because las time there was a two week diference in the time. Here in Mexico we allready set the time 1 our earlier last nigth. How about you guys? Are we having the same time. I didn´t hear anything in tne news.

Thanks.

2007-10-28 09:30:08 · 3 answers · asked by Good girl 1 in Geography

I've been wondering this for a little while now.
Does the pressure of the water bring it up?
Or something else?

2007-10-28 09:27:58 · 4 answers · asked by Anonymous in Physics

Calculate the moles of oxygen in the tank.

a) 383
b) 4.57
c) 0.0505
d) 0.383
e) 0.00378

thanks

2007-10-28 09:27:31 · 2 answers · asked by bocabrunette714 1 in Chemistry

2007-10-28 09:27:27 · 1 answers · asked by Anonymous in Earth Sciences & Geology

2007-10-28 09:26:25 · 5 answers · asked by Anonymous in Earth Sciences & Geology

2007-10-28 09:26:07 · 3 answers · asked by Anonymous in Earth Sciences & Geology

N2(g) + 3 H2 (g) --> 2NH3 (g) what is the maximum volume, in liters of NH3 that can be formed from 15.0 L of H2?

a) 7.50
b) 10.0
c) 15.0
d) 22.5
e) 30.0

2007-10-28 09:24:55 · 2 answers · asked by bocabrunette714 1 in Chemistry

2007-10-28 09:24:46 · 6 answers · asked by Bill K 1 in Geography

2007-10-28 09:24:43 · 7 answers · asked by Doug M 4 in Zoology

"Soft water" has been treated to replace the polyvalent metal cations with sodium and potassium ions. Why are the problems of scale and bathtub ring not associated with soft water?
...and/or...
What mineral(s) would be sources of the calcium in hard water?

2007-10-28 09:21:52 · 2 answers · asked by JitterBug589 3 in Chemistry

2007-10-28 09:19:16 · 2 answers · asked by Vanessa P 1 in Earth Sciences & Geology

A 280 g block on a 52.0 cm-long string swings in a circle on a horizontal, frictionless table at 85.0 rpm.

What is the speed of the block?
What is the tension of the string?

2007-10-28 09:18:12 · 1 answers · asked by Anonymous in Physics

17.78 mL of KMnO4 solution to oxidize all the Fe2+ ions to Fe3+ by the following reaction.

MnO4-(aq) + Fe2+(aq) Mn2+(aq) + Fe3+(aq) (unbalanced)

(a) What was the concentration of Fe2+ ions in the sample solution? in M

What volume of 0.0150 M K2Cr2O7 solution would it take to do the same titration? The reaction is shown below. in mL

Cr2O72-(aq) + Fe2+(aq) Cr3+(aq) + Fe3+(aq) (unbalanced)

2007-10-28 09:16:28 · 1 answers · asked by mark 2 in Chemistry

please help me solve this

2007-10-28 09:09:54 · 10 answers · asked by raliwms12 1 in Mathematics

ABC's Scariest Places On Earh traveled there but couldn't mention a name or exactually were it was because of it's terrible past. It was closed around the 1990's. Also a woman patient was murdered by a male patient with broken glass pieces, her dismembered body parts were spread around the aslyum and the man was never caught...any ideas?

2007-10-28 09:09:35 · 16 answers · asked by BlazenThaTrack77 2 in Paranormal Phenomena

my most vivd experience has to be being pushed into my matress several times..once and the last time i was being suffocated and i wasnt able to sit up as someone was trying to choke me..after that time it stopped..has any of u had a similar or any paranormal experience? and wat was it?

2007-10-28 09:09:19 · 9 answers · asked by just a girl 2 in Paranormal Phenomena

i have to a project on the Count of Monte Cristo...i have to make a map of all the important places...does the isle of monte cristo actually exist and where is it....also does the Chateau D'if exist?

2007-10-28 09:08:55 · 8 answers · asked by Anonymous in Geography

do it first for 10pts

2007-10-28 09:05:50 · 4 answers · asked by Anonymous in Astronomy & Space

C7H6O3 + CH3OH --> C8H8O3 + H2O

1st reactant = 1.50g Salicylic acid
2nd reactant = 11.20g Methanol
1st product = Aspirin
2nd product = Water
Experimental Yield is 1.27g

What is the theoretical yield?
What is the yield percent?

Please help me out ive been trying to figure this out for the last hour... Thanks

2007-10-28 09:03:53 · 1 answers · asked by jamet002 2 in Chemistry

Fe(NO3)3 + KSCN ===> ???????

2007-10-28 09:02:25 · 1 answers · asked by Anonymous in Chemistry

1. if ABCD is a parallelogram, m
a. 3
b. 31
c.61
d.121

2007-10-28 08:59:53 · 15 answers · asked by Conie C 1 in Mathematics