Science & Mathematics - 30 November 2007

The part that I am having a problem with is the reaction between I2 and KI. I know KI is a reactant and I2 is a product, and that there must be electrons somewhere in the reaction, but I can't figure out how all that fits in.

2007-11-30 03:01:53 · 1 answers · asked by Eliza L 1 in Chemistry

if AB=3x-5, BC=x+2, and AC= 13, then x=

2007-11-30 03:01:34 · 8 answers · asked by Anonymous in Mathematics

I am a very posative outlooking person, however, lately i feel like because of the constant beating me down from the people that i work with that i am sinking into a negativity trap where i am going backwards instead of forward and being "trapped" in time where i cant project my normal posative feelings twards my friends and family outside of work. (PS, I am looking for another job, but that doesnt happen overnight, what can i do while i wait it out!?? Heeeelp!!) Thank you for all answers.

2007-11-30 03:01:21 · 6 answers · asked by EAT! 3 in Parapsychology

Substance A has a vapor pressure(mmHg) of 275
Substance B has a vapor pressure (mmHg) of 459

Which has a higher heat of vaporization

Has a higher boiling point

is a gas at 300 mmHg

has weaker intermolecular forces

2007-11-30 02:57:56 · 2 answers · asked by Anonymous in Chemistry

if 28.2 g C20 H42 is dissolved in 500 g of C6H6(pure P 25 degrees = 93.4 torr), then what is the vapor pressure (in Torr) of the solution at 25.0 degrees celcius.

2007-11-30 02:56:55 · 2 answers · asked by confusedkid 3 in Chemistry

the base is 2 on both sides. i think the answer is either 0 or no solutions, right?

2007-11-30 02:51:37 · 4 answers · asked by m-o-o-n 3 in Mathematics

Any help would be appreciated. THANKS!!

2007-11-30 02:48:53 · 5 answers · asked by Anonymous in Astronomy & Space

Thanks in advance!!

2007-11-30 02:47:59 · 2 answers · asked by Anonymous in Astronomy & Space

The day and night are divided into 24 hours and hour in 60 minutes and minute in 60seconds.Can these be measured in meric system.And why a minute is equal to 60seconds.?

2007-11-30 02:44:28 · 9 answers · asked by krishjoshi 1 in Physics

or a:

Gastrointestinal physiologist

2007-11-30 02:43:01 · 2 answers · asked by Anonymous in Medicine

What are the steps in getting the answer to these kinds of question? How about if I only had the Molarity and the Ka of the acid?

What is the pH of a solution in which 20.0 mL of 0.10 M NaOH are added to 25.0 mL of 0.10 M HCl?
1) The answer is: 1.95.

2007-11-30 02:42:30 · 3 answers · asked by Summer Productivity 1 in Chemistry

2007-11-30 02:41:41 · 6 answers · asked by Jin T 1 in Astronomy & Space

2007-11-30 02:41:25 · 10 answers · asked by Anonymous in Mathematics

2007-11-30 02:39:19 · 5 answers · asked by Anonymous in Earth Sciences & Geology

What kind of things did you learn aobut?

What made it good/bad?

Do you think other countries could teach it better?

Better still, do you have any friend's experiences of geography?

Just asking because my family's geography's terrible (Although my maternal granfather went to sea a lot!!) and I saw a question from somebody else on Yahoo asking where a country is.

I'm from the UK and think that geography tends to be badly taught. It also seems to be more aobut the evironment than where other countries actually are tand their cultures.

We don't even learn where all the palces in the UK are, for crying out loud!! Well, didn't.

Only got taught geography up till 14 (Not even a GCSE option), and I don't know if they had geography lessons at primary school. Bear in mind that I went to special needs education till the age of 16.

2007-11-30 02:39:10 · 4 answers · asked by swelwynemma 7 in Geography

it twinkles a lot

2007-11-30 02:36:18 · 7 answers · asked by Autumn 1 in Astronomy & Space

I know noble gases are the most inclined to follow the octet rule, but I'm fairly certain Xe doesnt -- because there is an extended octet. Is an extended octet a direct violation of the octet rule, and does Xe violate it in this way despite its nobility? Thank you so much in advance.

2007-11-30 02:32:40 · 3 answers · asked by Anonymous in Chemistry

I lost six marks on a test because of this. Is it because it negates the restrictions that the denominators carry? or is it some rule created by mathematicians/my teacher?

2007-11-30 02:29:53 · 6 answers · asked by zheng89120 2 in Mathematics

The second part b) Determine the number of irreducible quadratic polynomials over Zp.

2007-11-30 02:29:49 · 1 answers · asked by jen w 1 in Mathematics

Find an equation of the line having the given properties. Express your answers using the general form of the equation of a line and also the slope-intercept form of the equation of a line.

(1) Parallel to the line x + y = 2; having the point (1, -3)

(2) Perpendicular to the line 3x - y = - 4;
having the point (-2, 4)

2007-11-30 02:28:57 · 6 answers · asked by journey 1 in Mathematics

please help with this

2007-11-30 02:27:04 · 3 answers · asked by Anonymous in Mathematics

Why is the sky blue?

2007-11-30 02:26:50 · 8 answers · asked by Tiju 1 in Astronomy & Space

2007-11-30 02:26:37 · 5 answers · asked by █▀▀▀▀▀█►♪♫♪ @ñgëÎ ♪♫♪◄█▄▄▄▄▄█ 3 in Botany

help!! math is hard... tell me how to solve, list the steps.

2007-11-30 02:26:18 · 7 answers · asked by Anonymous in Mathematics

2007-11-30 02:25:00 · 1 answers · asked by Anonymous in Engineering

A 2.3 kg stone is whirled at 55 rpm in a circle at the end of a wire of length 1.2 meters. If the plane of the circle is vertical, calculate

(1) the tension in the wire at the top of the cycle
(2) at the bottom of the cycle

2007-11-30 02:20:21 · 2 answers · asked by labelapark 6 in Physics

Select all of the following that appropriately define a chemical bond in VALENCE bond theory.

1.A chemical bond results from the overlap of a completely filled atomic orbital with an empty orbital.

2.A chemical bond is the sharing of electrons represented as dots.

3.The electrons involved in bonding are located in orbitals localized on individual atoms.

4.A chemical bond results from the overlap of two half-filled orbitals with spin-paring of the two valence electrons.

5. A chemical bond results from electrons occupying a nonbonding molecular orbital.

6.A chemical bond results from electrons occupying a bonding molecular orbital.

2007-11-30 02:13:11 · 1 answers · asked by Donna L 3 in Chemistry

Which one of the following statements is ALWAYS true according to VSEPR theory?

1.The shape of a molecule is determined by repulsions among nonbonding electron groups.

2.The shape of a molecule is determined by the polarity of its bonds.

3.All of these are true.

4.The shape of a molecule is determined by repulsions among all electron groups on the central atom.

5.The shape of a molecule is determined by repulsions among bonding electron groups.

2007-11-30 02:12:00 · 3 answers · asked by Donna L 3 in Chemistry

sin(π/4 + x) + sin(π-x) = √2 cosx

2007-11-30 02:11:13 · 3 answers · asked by Princess 2 in Mathematics

I've looked it up and can not seem to find an answer! If you know just explain to me please.

2007-11-30 02:09:51 · 12 answers · asked by Cat 1 in Zoology