Science & Mathematics - 26 December 2007

Which one of the following is most likely to be a covalent compound?
a. KF
b. CaCl2
c. SF4
d. Al2O3
e. CaSO4

2007-12-26 11:39:51 · 2 answers · asked by svince1884 1 in Chemistry

Did American Lions live in groups or were they solitary (loners)??????????????

2007-12-26 11:39:39 · 4 answers · asked by Anonymous in Other - Science

Which one of the following is most likely to be an ionic compound?
a. KF
b. CCl4
c. CS2
d. CO2
e. ICl

2007-12-26 11:39:08 · 4 answers · asked by svince1884 1 in Chemistry

When graphing 2 lines on the same graph, which of the following will result in an algebraic solution that is "undefined" or "no solution"?


and...


Is it even possible to find the product B times A?

2007-12-26 11:39:03 · 5 answers · asked by Anonymous in Mathematics

I like 9/16. The sound of it rolling off of my tongue is so soothing.

2007-12-26 11:36:09 · 9 answers · asked by Bill W 【ツ】 6 in Mathematics

Specifically does such a mix have enough glycol in it to offset the expansion of the water or does it need to be stronger? Blockages from frozen fluids are not a concern, expansion is though.

2007-12-26 11:33:01 · 2 answers · asked by John H 1 in Chemistry

if you add 3/4 of a number back to the number itself, you get 49. Find the number.

Let _____ = __________________________

Equation: ___________________________

2007-12-26 11:32:32 · 9 answers · asked by Anonymous in Mathematics

would you please explain?

http://img402.imageshack.us/img402/9198/mathgrpahskl6.jpg

2007-12-26 11:28:34 · 4 answers · asked by Anonymous in Mathematics

2007-12-26 11:28:10 · 5 answers · asked by Anonymous in Mathematics

A box slides down a 30.0 degree ramp with an acceleration of 1.20 m/s/s. Determine the Coefficient of kinetic friction between the box and the ramp.

2007-12-26 11:27:58 · 3 answers · asked by Anonymous in Physics

Help! My teacher has never taught my class how to solve problems similar to this. Instead he gave a summative lab with very similar questions as the one show above. And sadly our textbooks do not explain how to solve such a problem very well. Texas high school textbooks suck!

I have tried everything. I have added the g/mol & amu's. I have even solved for the percentage that each element occupies in the problem---as so far I have been unsuccessful. Can someone please tell me how to solve this problem?

Here's the question:

1)How many Cl- ions are present in 2.00 mol of KCl?

[A] 12.04 * 10^23
[B] 6.02 * 10^24
[C] 2.00
[D] 0.5

A link or diagram would be very appreciated.

2007-12-26 11:23:06 · 1 answers · asked by Anonymous in Chemistry

in an effort to keep out 3rd tier ETs who do horrible things like experimenting with our bodies like just so many lab rats?

2007-12-26 11:20:12 · 6 answers · asked by stale mate 3 in Astronomy & Space

I know this is an easy question but I completely forgot how to find percentages.

2007-12-26 11:19:03 · 13 answers · asked by Anonymous in Mathematics

ok... i am studing for the sat. one of the questions in the sat studyguide is:

which of the following could be the remainders when four consecutive positive integers are each divided by 3?

a) 1,2,3,1
b) 1,2,3,4,
c) 0,1,2,3
d) 0,1,2,0
e) 0,2,3,0

the answer is d. but i don't understand how they got the answer. it explains it but it doesn't make sense to me. please help me.

thank you so very much!

2007-12-26 11:12:23 · 6 answers · asked by Elizabeth 3 in Mathematics

the side effects include mild hallucinations, really bad dry mouth and being constantly thirsty to the piont i'm drinking nearly 7 to 8 liters of water a day, a loss of appetite, shaking, and my resting heart rate is 107 which i no it isn't normal for a healthy 17yr old girl! this i don't think is due to Naprosyn! so i don't not what to do beacuse if i don't take the acupan i can't walk/bend down and i'm in excrustating pain and my doctors are not open for another week beacuse of christmas? anyone that can help me i'll would be very greatfull!?!?!

thankyou
xxx
ooh i forgot happy chrismas!!!!

2007-12-26 11:01:26 · 6 answers · asked by parklane_disabilityofficer 2 in Medicine

instructions please
in instruction format like:

1.) First...
2.) Next...

2007-12-26 10:58:02 · 3 answers · asked by Jess 3 in Earth Sciences & Geology

Ok... the equation is 4^2b-3=8^1-b

What is the value of b?

-3/7

7/9

9/7

10/7

2007-12-26 10:58:01 · 5 answers · asked by Anonymous in Mathematics

So there was a woman at the country while I was a child - people said she was 'a witch' - and she was famous for preparing her food without using wood for the fire.
People used to argue it was either 'the devil' who served her, or the power of her spoken charms or the herbs etc.

Anyway, I met a neighbor today, coming home, and she asked me straight to her place. Once in the kitchen, she unpacked her stuff, I sat down, she put the milk in a crate, I lit up a cigarette, she said it was impolite to keep me in the kitchen, I asserted it was no problem, let's wait until the milk is done. To which, she turned to the stove, said three words (silly archaic words which would approximately translate into 'Lord, make it grow') and the boiling was... done. The milk fill out and she turned off the gas.
We could go to the living room now...

What was that? It must have took less than 2 minutes between the moment she lit the gas and then shut it down.

2007-12-26 10:53:37 · 15 answers · asked by Mirko 7 in Parapsychology

Ten points for the first and quickest correct answer.

2007-12-26 10:52:45 · 5 answers · asked by katrinasfather 3 in Earth Sciences & Geology

It might have been on the Blue Planet series I saw this covered, but I can't recall the details. It was near a cold seep that undersea explorers discovered an "underwater sea". The water in it was more dense than the surrounding water, so the dense water sank and formed its own distinct layer, complete with a rippling surface and shoreline. What I want to clarify is what causes this layer to be so heavy? Does it have significantly more salt dissolved in it? Or is it the result of other chemicals in the water? What makes the sunken sea different from the surrounding water?

2007-12-26 10:51:04 · 3 answers · asked by aarowswift 4 in Earth Sciences & Geology

Cu(OH)2 (s) + 2HNO3 (aq) ---> Cu(NO3)2 (aq) + 2H20 (l)
Fe2O3 (s) + 3CO (g) ---> 2 Fe (s) + 3CO2 (g)
Sr(NO3)2 (aq) + H2SO4 (aq) ----> SrSO4 (s) + 2HNO3(aq)
4Zn(s) + 10H+ (aq) + 2NO3- (aq) ---> 4Zn 2+(aq) + N2O (g) + 5H20 (l)

they can be precipitation or acid base reactions too

2007-12-26 10:50:32 · 2 answers · asked by Anonymous in Chemistry

2007-12-26 10:49:54 · 6 answers · asked by Caysie101 5 in Medicine

I don't mean second-hand stories, but has this happened to you? My son didn't speak in a way that made any sense until he was nearly 4 (he has autism). When he began to speak understandably, he told his dad a long story about his life "when he lived before" as a road builder in Africa; and then said "I also lived in the future in a metal body, and when it stopped working, decided I would go backwards in time and picked you for my parents." He certainly didn't pick these ideas up from any of our family. If just from a psychological perspective, though, it interests me in trying to understand my little guy. Thanks for any insights.

2007-12-26 10:46:40 · 21 answers · asked by ? 6 in Other - Alternative

Salt is a city and Amman is a city.

2007-12-26 10:42:33 · 1 answers · asked by Brandon 1 in Geography

1.One side of a triangle is 5 meters longer than the second side.The third side is four times the length of the second side.If the perimeter of the triangle is 63 meters,how long is the second sides?


2.The sum of two angles in a triangle totals 117 degrees,what is the measure of the third angle?

3.Find the area of a triangle with base 21 inches and height 8 inches.

2007-12-26 10:41:28 · 6 answers · asked by Anonymous in Mathematics

2007-12-26 10:41:16 · 2 answers · asked by don 1 in Geography

http://i11.tinypic.com/6oax2kp.jpg
how would i go about solving this?

2007-12-26 10:40:31 · 5 answers · asked by Anonymous in Mathematics

bob bought one twin pack of video games for $42. This is $6 less than 2/3 the cost of a triple pack of video games. What is the price of a triple pack of video games.

Let _____ = __________________________
Let _____ = __________________________

Equation: ___________________________



Maria is 240 cm tall. This is 3 cm less than 3 times her height at birth. Find her height at birth.

Let _____ = __________________________
Let _____ = __________________________

Equation: ___________________________

2007-12-26 10:36:17 · 5 answers · asked by Anonymous in Mathematics

2007-12-26 10:26:02 · 5 answers · asked by Anonymous in Medicine

I'm not so much interested in straight answers as much as I'm interested in the work that's involved in figuring out these problems. D: I need to know how to get from one point to another on problems like these if I have a hope of passing the test.

1. In the reaction shown below 4.0 mol of NO is reacted with 4.0 mol of O2

2NO + O2 ---> 2NO2

a. Which is the excess reactant, and which is the limiting reactant?
b. What is the theoretical yield, in units of mol, of NO2?

2. In the reaction shown below 64g CaC2 is reacted with 64g H2O.

CaC2(s) + 2H2O(l) ---> C2H2(g) + Ca(OH)2(s)

a. Which is the excess reactant, and which is the limiting reactant?
b. What is the theoretical yield of C2H2?
c. What is the theoretical yield of Ca(OH)2?

3. In the reaction shown below, 28g of nitrogen are reacted with 28g of hydrogen.

N2(g) + 3H2(g) ---> 2NH3(g)

a. Which is the excess reactant, and which is the limiting reactant?
b. What is the theoretical yield of ammonia?
c. How many grams of the excess reactant remain?

2007-12-26 10:25:09 · 2 answers · asked by Anonymous in Chemistry