Science & Mathematics - 12 December 2007

i know that its is a halogen and therefore should be diatomic but the internet moslty says that it is just At. not At2

2007-12-12 09:19:21 · 3 answers · asked by poo 2 in Chemistry

How many grams of oxygen are formed at decomposition 490g potassium chloride

2007-12-12 09:17:38 · 3 answers · asked by A Student 1 in Chemistry

The one with the correct answer gets the best answer!! U have to have all the decimals also... Good luck!

2007-12-12 09:17:31 · 11 answers · asked by C5701 2 in Mathematics

A) Inspecting the chemical equation
B. Balancing the chemical equation
C. laboratory analysis
D. writing a word equation

2007-12-12 09:17:02 · 1 answers · asked by Anonymous in Chemistry

2007-12-12 09:15:11 · 6 answers · asked by snuggleslvr15 1 in Biology

2007-12-12 09:14:34 · 5 answers · asked by Anonymous in Biology

3x+5y=2
x+4y= -4

I've solved all my other problems, but this one is giving me trouble. I must find x and y (the problems are the same; x and y equal the same in both problem.

Please help?

2007-12-12 09:11:52 · 7 answers · asked by Anonymous in Mathematics

2007-12-12 09:09:09 · 3 answers · asked by Anonymous in Biology

How do you polish a rock without a rock tumbler?

2007-12-12 09:08:28 · 5 answers · asked by Anonymous in Earth Sciences & Geology

Is there something to do with the traction or friction with spinning tires ?

2007-12-12 09:08:08 · 1 answers · asked by Anonymous in Physics

an isosceles triangle has two sides of length a, and the angle between them is θ. Write the area A of the triangle in terms of a and θ. Then find the area of the triangle when a = 10 inches and θ = 30°.

please show as much work as possible


thanks for your help

2007-12-12 09:04:52 · 2 answers · asked by lynnsteichen 2 in Mathematics

You know those lead aprons they make u wear when getting xrays? theyre realllly heavy. any idea how to use that same technology (what materials are used?) and to revolutionize it so its actually built into regular clothing u can wear on a daily basis?
thanks a lot!

2007-12-12 09:04:06 · 4 answers · asked by Anonymous in Other - Science

I am having trouble with this math problem in calculus:
The CDC has discovered a new highly contagious disease. They estimate that t days after the disease is first observed in a community, the percent of the population infected by the disease is approximated by P(t) = 20t^3 - t^4 / 1000 for 0 less than or equal to t less than or equal to 20. When will the population reach maximum infection? What percent of the population will be infected?

2007-12-12 09:03:22 · 2 answers · asked by qtpooh83 2 in Mathematics

2007-12-12 09:02:05 · 1 answers · asked by Anonymous in Earth Sciences & Geology

The vapor pressure of CCl3F at 300K is 865 torr. If 11.0 g of CCl3F is enclosed in a 1.1-L container, what is the liquid present?

Confused so any help would be apprecated. Thanks

2007-12-12 08:58:56 · 2 answers · asked by FANTASY 2 in Engineering

1. Given the ratios of the lengths of the sides of triangle DEF and triangle XYZ. Is triangle DEF similar to triangle XYZ?
Triangle DEF 1:1:2
Triangle XYZ 3:3:6

A)Yes
B)No
C)Cannot be determined


2. Solve the following proportion
3/y + 2 = 2/y

A)4
B)1
C)3
D)2

2007-12-12 08:56:20 · 3 answers · asked by Anonymous in Mathematics

The human body obtains 965KJ of energy from a candy bar.
If this energy were used to vaporize water at 100.0 degrees C. how much water (in liters) could be vaporized? (Assume the density of water is 1.00g/mL).

I have been working on this equation for a while now, so any help would be appreciated. THANKS

2007-12-12 08:55:25 · 2 answers · asked by FANTASY 2 in Chemistry

3 (4/9) (-4) (6/4)

5 (3/4) (-4) (-2)


I really want to know how to do these problems I just don't want the answers I want an explaintion of the overall material as well

2007-12-12 08:52:55 · 3 answers · asked by TheMiddleisSafe 3 in Mathematics

2007-12-12 08:50:17 · 8 answers · asked by trek trek 5 in Chemistry

4 hikers have to cross a bridge. The bridge wiill collapse in exactly 17 minutes. It is pitch black outside and they only have 1 flashlight between them. The hikers all cross at different rates; one can cross in 1 minute another crosses in 2 minutes, and the others cross in 5 and 10 minutes respectively. The group of 2 travels at the slower hikers rate. The hikers can only cross in groups of 2 at the most. Each group has to have the flashlight give to them by hand. No tricks allowed, such as 1 hiker carries another, they throw the flashlight, or they go halfway and shine the light, ect. Thanx for the help!

2007-12-12 08:47:51 · 4 answers · asked by Jenna F 2 in Mathematics

My science teacher says lithology, is that right? i know the study of minerals is mineralology.

2007-12-12 08:46:06 · 3 answers · asked by JK!! 1 in Earth Sciences & Geology

At what minimum speed must a projectile be launched from Greenwood High to score a direct hit on Warren High. distance = 10.64 miles

2007-12-12 08:45:33 · 1 answers · asked by Riley W 1 in Physics

2007-12-12 08:45:21 · 2 answers · asked by Alex P 1 in Mathematics

When you have a hot beverage, tea for example, and you place an ice cube in it, you hear some cracking noises. Then, you begin to see the cracks in the ice cube. Why is that?

2007-12-12 08:45:06 · 4 answers · asked by Anonymous in Physics

How many steps in one meter?

2007-12-12 08:44:28 · 5 answers · asked by Hmm 1 in Mathematics

Light with wavelength 442nm passes throught a double slit sustem that has a slit separation d=0.400mm. Determine how far away a screen must be placed so that dark fringes appear directly opposite of both sides.

Please just show the steps, I don't require a numbercal answer.

Thank you in advance.

2007-12-12 08:41:03 · 2 answers · asked by Anonymous in Physics

Let A, B, and C be r.v.'s. Below is their joint density function:

f_A,B,C of (a, b, c) =
2/3(a+b+c) when 0 ≤ a,b,c ≤ 1 and
0 elsewhere

find the probability that A ≤ 1/2.

2007-12-12 08:40:41 · 1 answers · asked by cornzxo 1 in Mathematics

can someone help me with these math problems??

x^2 + x + 5 = 0

x^2 + 4x +1 = 0

Please help me start them off!! thanks

2007-12-12 08:40:34 · 5 answers · asked by Fuzzyglasses 3 in Mathematics

i have to expand and simplify these...
x(x+1)+1(x+1)

s(s+4)-2(s+4)

please help
much thanks

2007-12-12 08:40:12 · 7 answers · asked by Anonymous in Mathematics

2007-12-12 08:39:28 · 5 answers · asked by DaYrØn™ 2 in Physics