Science & Mathematics - 14 January 2007

2007-01-14 01:00:25 · 3 answers · asked by Amar khabra 1 in Mathematics

2007-01-14 00:59:52 · 14 answers · asked by Anonymous in Mathematics

i was asked to draw dot and cross diagrams for the following covalent compounds,and then draw their shapes and state what the bond angles are,

H2O - I said was obviously water, with a bond angle of 104 degrees and the shape is bent.

H30+ - I said was a hydronium ion, with a bond angle of 107 degrees and the shape is pyramidal

-H402+ - I don't know what the hell this is lol

H202 (H-0=0-H) - I said is hydrogen peroxide, with a bond angle of 104 degrees and the shape is bent.

I cant show u my dot and cross diagrams but is the above right? And if you know what -H402+ is please let me know lol a chinese webpage came up as Methoniumion but i still dont know it

2007-01-14 00:58:50 · 3 answers · asked by yummygummybear2006 1 in Chemistry

2007-01-14 00:55:53 · 7 answers · asked by santu 1 in Chemistry

2007-01-14 00:50:09 · 5 answers · asked by santu 1 in Chemistry

2007-01-14 00:48:05 · 1 answers · asked by cmgal 1 in Engineering

I am having a really hard time at this one. For days I have watched video lectures and I am still not understanding this. Can some one help me please?

2007-01-14 00:47:46 · 4 answers · asked by flower67 1 in Mathematics

If you and a friend are given a matrix, and you both go through different operations to reduce it, will you both have the exact same reduced matrix? If so, why is that? Be as clear as possible, state properties and laws if you'd like.

2007-01-14 00:42:18 · 3 answers · asked by sua428 2 in Mathematics

2007-01-14 00:41:14 · 7 answers · asked by Anonymous in Chemistry

2007-01-14 00:39:53 · 9 answers · asked by Anonymous in Chemistry

Ok, first to answer correctly, with a solution that is both succint and clear gets my best answer vote.

Okay, let's get started:
Eight points on a circle are grouped into disjoint pairs. Each pair is joined by a chord. Find the number of ways of joining the pairs such that no two of the chords intersect.

2007-01-14 00:39:30 · 4 answers · asked by Sentient 2 in Mathematics

You are preparing reagents for your dideoxy sequencing project. You want to make a stock solution of ddGTP (514.93 g/mol). How much ddGTP will you need to weigh out to make 1000µl of a 100mM stock?


a.5.15x10-1 grams

b.5.15x10-3 grams

c.5.15x100 milligrams

d.5.15x104 micrograms

2007-01-14 00:32:51 · 3 answers · asked by Anonymous in Chemistry

If i were to be asked by an interviewer ' why do you want to become a doctor'...what should i reply with? give some examples of impressive & mature answers...plz

2007-01-14 00:29:52 · 15 answers · asked by anjoi_05 2 in Medicine

2007-01-14 00:28:23 · 15 answers · asked by Anonymous in Biology

2007-01-14 00:25:06 · 10 answers · asked by seenu 1 in Astronomy & Space

we say the light speed is constant every were but i think light speed same as sound speed depent on some characteristics of media. why does some particles in Accelerators move with speed more than light ?

2007-01-14 00:18:43 · 9 answers · asked by davood s 1 in Physics

Can anyone please tell me what kind of flowers are blue and white in colour in nature(not dyed)? Not in both blue and white but a flower that is solely blue or solely white. Thank you!

2007-01-14 00:17:57 · 5 answers · asked by the DoEr 3 in Botany

I know that Leeches can help in modern medicine.
They suck on your blood but what for?
Are they similar to maggots and eat or suck at the bad parts of your blood?
I have no idea

2007-01-14 00:17:33 · 11 answers · asked by Walter 2 in Medicine

2007-01-14 00:16:12 · 5 answers · asked by Larry 4 in Astronomy & Space

Please give me an example for an isoton

2007-01-14 00:12:55 · 4 answers · asked by Anonymous in Chemistry

could some one jus give me a number rather than give me like a formula to work out any term
thank you

2007-01-14 00:12:50 · 7 answers · asked by Anonymous in Mathematics

From the list provided below, select the correct answer to the following question. If DNA polymerase A has an error rate of 10-6 and makes 1 error every 106 internucleotide linkages the DNA polymerase B with an error rate of 2.59x10-5 will make one error every:


a.2.59x105 bp

b.5.18x105 bp

c.77,220 bp

d.38,610bp

2007-01-14 00:12:25 · 1 answers · asked by Anonymous in Biology

2007-01-14 00:09:36 · 3 answers · asked by Anonymous in Astronomy & Space

2007-01-14 00:08:12 · 7 answers · asked by 8 3 in Mathematics

dsgdfsgfdgfdgdfghgh7utyuty

2007-01-14 00:07:32 · 4 answers · asked by devanshu 1 in Geography

and i dont really get whet i'm suppossed to be doing.

Explain the relative values (melting points) in terms of bonding:

Na 371K
Mg 922K
Al 933K

How do i answer this? is the higher the K value meaning there are more bonds or something?

2007-01-14 00:04:11 · 6 answers · asked by Anonymous in Chemistry

Can u help find the values of each of the following giving your answers correct to 3 decimal places, with workings pls.

(i) x^2e^(3x+1) when x = 0.1

(ii) 4e^-x cos 3x when x = 2 radians

(iii) 3 cosec x +7 cot x when x = 1 radian

(iv) 3 ln(cos x) when x = 0.1 radian

2007-01-14 00:02:22 · 5 answers · asked by SHIBZ 2 in Mathematics

2007-01-14 00:02:21 · 4 answers · asked by Anonymous in Astronomy & Space

2007-01-14 00:01:54 · 18 answers · asked by Anonymous in Mathematics

2007-01-14 00:00:54 · 13 answers · asked by darren e 1 in Botany