Science & Mathematics - 28 October 2006

Which of the following designations, polar or nonpolar, are correct for the given compounds below ?


a) HF : polar

b) NH3 : nonplar

c) CH3CH2CH2OH : nonpolar

d) I3- : polar

2006-10-28 11:42:03 · 6 answers · asked by MARK 2 in Chemistry

2006-10-28 11:39:29 · 9 answers · asked by leejg78 1 in Mathematics

Identify the hybridization of the central atom for both





XeF4 and PO4-3

2006-10-28 11:38:57 · 2 answers · asked by MARK 2 in Chemistry

2006-10-28 11:38:25 · 9 answers · asked by Denise D 1 in Biology

Would cutting down on carbon emissions have a significant positive impact or does the world's environment fluctuate in a process largely outside of our control?

2006-10-28 11:37:50 · 7 answers · asked by jsb3t 3 in Weather

Identify the hybridization of the carbon atom(s) in C2F4

Also give the number of π bonds in the molecule or ion

2006-10-28 11:36:59 · 2 answers · asked by MARK 2 in Chemistry

I know we are going to turn our clocks back an hour tonight, and I know it will get darker faster, but does that mean that it'll be light earlier?

2006-10-28 11:35:45 · 23 answers · asked by AngieandCeez 3 in Weather

a. anterior spinothalamic
b. reticulospinal
c. lateral spinothalamic
d. posterior spinothalamic

2006-10-28 11:32:48 · 4 answers · asked by TAZZZZ7 1 in Botany

2006-10-28 11:32:25 · 5 answers · asked by 09'Ready 3 in Physics

2006-10-28 11:32:09 · 9 answers · asked by Anonymous in Astronomy & Space

If the radius of a circular pizza is 22.0cm
what area does the pizza cover?If the pizza is cut into four equal peices what is the area of each peice?

This is not homework, I need to know how to find out the area of a circle using radius and how to find the area of the peices if you cut the circle.

Please help.

2006-10-28 11:32:06 · 9 answers · asked by Dharshi 2 in Mathematics

2006-10-28 11:30:56 · 16 answers · asked by Lisa 4 in Geography

Do you believe in little green men?

2006-10-28 11:30:50 · 12 answers · asked by Whisperer 1 in Astronomy & Space

A random sample of 49 customers leaving a supermarket and made purchases revealed that the mean amount spent was $75 with a sample standard devitation of $15. The standard error of this sample is?

a. $15

b. $2.14

c. $2.50

d. $60 to $90

2006-10-28 11:30:37 · 1 answers · asked by mrkittypong 5 in Mathematics

Problem: Find two prime numbers that, when multiplied, produce a 400 digit number.

...Has anyone even seen a 400 digit number? What would you call that number? Anyways its obvious that you would have to work with scientific notation, but I dunno what forrmula/strategy to even try...

BTW, I posted this question under computer security and under math because I know this deals with the basics of computer encryption. This is actually a course in my I.S.S. program...

2006-10-28 11:30:20 · 3 answers · asked by ? 4 in Mathematics

ammonium nitrate + water

ammonium nitrate - water

can it be reversed

2006-10-28 11:30:20 · 2 answers · asked by Me + Me = BANG! 2 in Chemistry

Find the derivative at each critical point and determine local extreme values of y=x^2 * the square root of (1-x)

2006-10-28 11:29:29 · 3 answers · asked by Anonymous in Mathematics

x^2 - 4x = 3

2006-10-28 11:26:57 · 7 answers · asked by jrrkidd 1 in Mathematics

Find the number which subtracted from its square equals 56?

2006-10-28 11:26:19 · 5 answers · asked by jrrkidd 1 in Mathematics

solve x^2-16x=6y

2006-10-28 11:25:10 · 2 answers · asked by jrrkidd 1 in Mathematics

The product of three whole number is 135, the sum of the same three whole number is 17. What are the numbers?

2006-10-28 11:24:22 · 5 answers · asked by jrrkidd 1 in Mathematics

a. the spinal cord may be affected
b. the cranial nerves would not form
c. the hindbrain would not be present
d. the telecephalon would cease development

2006-10-28 11:23:41 · 2 answers · asked by TAZZZZ7 1 in Biology

x^2/3 over x^1/2

2006-10-28 11:22:33 · 8 answers · asked by Kevin 5 in Mathematics

The cube of a number is 1778. What is the number?

2006-10-28 11:21:40 · 2 answers · asked by jrrkidd 1 in Mathematics

Consider the combustion reaction:
C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(l)
When 0.200 mol of C3H8 undergoes combustion, the heat released is sufficient to raise the temperature of 1550 g of water from 20.0 °C to 70.8 °C. Based on these data, calculate ΔH for this reaction. Specific heat of water is 4.18 J/ g•°C. All choices are per mol of C3H8.

A. -1650 molkJ
B. -1240 molkJ
C. -860 molkJ
D. -1950 molkJ
E. -430 molkJ

How did you work it out? Thanks.

2006-10-28 11:17:37 · 2 answers · asked by Anonymous in Chemistry

Currently, I'm taking a biology but I need to take two more science courses before I start my major courses. Plus, I maybe transferring to another institution soon and I need a certain amount of science courses before I leave. Should I do the following

1. Take two semesters of chemistry
2. Take two semesters of physics
3. Take one chem then one physics

**** In addition, if I take Chemistry, should I take the Introductory course first? If not, how should I prepare for such a class. Is there an introductory course to physics???

2006-10-28 11:16:41 · 5 answers · asked by rosie768 3 in Physics

And do grenades explode when the pin is pulled, but they are not thrown? If you were to through a grenade while the pin was still intact the grenade will not explode. However, the opposite is true when the pin is not intact and the grenade is thrown. Why is this?

2006-10-28 11:14:09 · 11 answers · asked by Anonymous in Chemistry

A little personal sentiment...

We all hear you!

It could be the Heart... Anywhere!

2006-10-28 11:12:39 · 17 answers · asked by AZRAEL Ψ 5 in Earth Sciences & Geology

2006-10-28 11:10:06 · 57 answers · asked by ? 2 in Geography

2006-10-28 11:09:22 · 7 answers · asked by Anonymous in Zoology