Science & Mathematics - 15 October 2007

1. Which of the following statments correctly identify the above molecules that are equivalent to each other ?

A) a and c
B) a and d
C) b and c
D) b and d
E) c and d


picture is at the link below
http://xed.xanga.com/d17825e6c41a8152401157/b113737512.jpg


2. Use the following letters corresponding to the molecular geometries to answer parts A. and B.

a) triangular planar b) tetrahedral

c) trigangular pyramidal d) octahedral

e) trigonal bipyramidal f) linear g) angular

A. What is the molecular geometry of a SiCl4 molecule ?
B. Predict the molecular geometry of ClO3-

3. What is the electron-pair geometry of ClF5

You must type the name in, e.g. triangular planar
note that the computer is case insensitive, you can use either upper or lower case letters in the answer you enter.

NOTE: If you need to enter T-shaped enter it with a hyphen, just like it appears here.

2007-10-15 14:05:28 · 1 answers · asked by gotMUNCH 2 in Chemistry

Two identical blocks of mass m=2.35 kg each start out at rest at height h=1.63m above ground. Block 1 will fall directly down when released. Block 2 will slide down a frictionless ramp of angle 22 degrees. Using Conservation of Energy, (a) find the final speed v of Block 1 in the moment before it hits the ground, and (b) find the final speed v of Block 2 in the moment before it touches the ground.

I've got part (a) I think but I'm not sure, and part (b) is giving me fits. Anyone know how to do something like this?

2007-10-15 14:04:24 · 1 answers · asked by Big Thinker 3 in Physics

what is Telekinesis? people say it is all kinds of different things. i wanna know what is really is

2007-10-15 14:03:25 · 6 answers · asked by Anonymous in Parapsychology

What is the formula for: Antimony pentoxide?

2007-10-15 14:01:23 · 7 answers · asked by Anonymous in Chemistry

can anyone help me graph r = 2costheta on an x-y plane. please show me what you did step by step.thank you

2007-10-15 14:01:10 · 4 answers · asked by starz8 2 in Mathematics

A sample of a gas at 28oC and 498 mmHg occupies a volume of 781 mL. What is the pressure, in mmHg, of the gas sample at 43oC and a volume of 241 mL?

2007-10-15 14:00:20 · 2 answers · asked by Bernie 1 in Chemistry

2007-10-15 14:00:14 · 2 answers · asked by Sonia B 1 in Biology

2007-10-15 13:59:49 · 4 answers · asked by La Princesa 3 in Geography

if lithium were to gain or loose electrons, what charge would form on the atom? ahd how did u find the answer?

2007-10-15 13:59:49 · 5 answers · asked by Anonymous in Chemistry

2007-10-15 13:58:43 · 1 answers · asked by mike p 2 in Mathematics

evaluate:
cos[Arctan (-2)]

2007-10-15 13:57:50 · 1 answers · asked by mandy 1 in Mathematics

2007-10-15 13:55:52 · 8 answers · asked by l c 1 in Mathematics

2007-10-15 13:55:13 · 4 answers · asked by lil 1 in Geography

A horizontal rifle is fired at a bull's-eye. The muzzle speed of the bullet is 605 m/s. The barrel is pointed directly at the center of the bull's-eye, but the bullet strikes the target 0.045 m below the center. What is the horizontal distance between the end of the rifle and the bull's-eye?

2007-10-15 13:54:58 · 1 answers · asked by tim w 1 in Physics

My friend and I have had a disagreement on this issue and I need help to resolve it.

I said that the LaBrea Tar Pits was NOT the only place where tar seeps out of the ground in Southern California, that in fact there are many places where smaller sepages occur.

She insisted that I was wrong and that there was NO tar except in Northern California. She said that the people who made the documentary about it (where I got my information) must be liars.

Who is right?

2007-10-15 13:53:17 · 3 answers · asked by Dysthymia 6 in Earth Sciences & Geology

A gas occupies 32.5 mL at 0.698 atm. It is then compressed to a volume of 0.193 mL. What is the new pressure, in atm, if the temperature remains constant?

2007-10-15 13:51:00 · 2 answers · asked by Bernie 1 in Chemistry

can someone explain what a spring constant is and what the difference is between a small one and a big one?

2007-10-15 13:50:25 · 2 answers · asked by softballkid4ever 2 in Physics

what is the name of the gas that is released from sodium bicarbonate when it reacts with water?

i really appreciate it if you can find the answer

2007-10-15 13:48:30 · 2 answers · asked by Anonymous in Chemistry

how do you separate:
vinegar & oil, sugar dissolved in water, charcoal & sugar, baking soda in water, and salt & water... if not where is a good site to visit?

2007-10-15 13:47:51 · 2 answers · asked by jovial-one 2 in Chemistry

Whats 40 degress celsius changed into fahrenheit?

2007-10-15 13:47:15 · 2 answers · asked by Wowza Emily 2 in Chemistry

1) Drought
2) Salinization
3) Famine
4) Economic losses
5) Lower living standards

2007-10-15 13:46:54 · 1 answers · asked by white tea 1 in Earth Sciences & Geology

i have a 1-methylbutane it reacts in the presence of Cl + Light

what would the product be like? (ie would there be another bond on the 1-methylbutane to place the Cl?

2007-10-15 13:46:05 · 1 answers · asked by sky l 1 in Chemistry

Hi! I am a sophomore in high school, and this year I plan to do my science fair project on piezoelectric. I am in honors chemistry, and I want to create piezoelectric crystals, and measure the amount of energy given when pressure is applied. I want to use different types of crystals that I can preferably create myself. Then, I would like to possibly light a small LED.

I know that I can make one type of crystal by using Rochelle salt. Does anyone know of any others, preferably ones that can be made at home?

Also, what is the type of meter I need to get to measure the very small amount of charge that is given off by the crystals. Can I pick one up at my local hardware store, and how much will I have to cough up? The same goes for what ingredients I need for my crystals?

Thanks a lot in advance. I look forward to reading your answers. Please feel free to e-mail me if you need more information, or if I am not coherent enough. Once again, thanks!

2007-10-15 13:46:00 · 3 answers · asked by Anonymous in Other - Science

2007-10-15 13:44:21 · 1 answers · asked by mathstudent 2 in Mathematics

2007-10-15 13:44:13 · 1 answers · asked by Azumi 2 in Mathematics

(sin x^3)= Sin X cubed
(sin^3 x)= Sin cubed X

thanks!

2007-10-15 13:41:59 · 2 answers · asked by meeeeee 2 in Mathematics

A physics student pulls a block of mass m = 22 kg up an incline at a slow constant velocity for a distance of d = 3 m. The incline makes an angle q = 30° with the horizontal. The coefficient of kinetic friction between the block and the inclined plane is µk = 0.2.

Picture: https://wug-s.physics.uiuc.edu/cgi/courses/shell/common/showme.pl?cc/DuPage/Phys1201/fall/homework/Ch-08-Energy-Conservation/block_ramp_friction_spring/9.gif

a) What is the work Wm done by the student?

b) What is the speed v of the block when it first reaches the horizontal surface?

c) What is the spring constant k of the spring?

d) How far up the incline d1 does the block rebound?

2007-10-15 13:41:21 · 1 answers · asked by Anonymous in Physics

When a person in the hospital is given fluid intravenously (an I.V.) the fluid is typically a saline solution (salt) with about the same water concentration as human body tissues. explain how the use of distilled water in place of this saline solution would be expected to upset the patient's homeostasis. (may be related to Diffusion)

2007-10-15 13:41:09 · 3 answers · asked by lisazhang112004 1 in Medicine

Volume of gas- 8.352 mL
Pressure- 742 mm Hg
Temperature - 99 Celsius (372 Kelvin)
Mass of Condensed Liquid- .0326 g.

What is molar mass?

I know the equation is Molar Mass= Mass RT/ VP, but what is it when you plug everything in.?

2007-10-15 13:38:50 · 4 answers · asked by aaadaj 1 in Chemistry

where would i go to sell some mt agates(in raw form)?

2007-10-15 13:15:46 · 1 answers · asked by lori d 1 in Earth Sciences & Geology