Science & Mathematics - 7 February 2007

From the information given, determine whether the substance described is ionic, polar covalent, nonpolar covalent, or metallic.

a - A gas with an irritating odor was found to dissolve in water but the solution did not conduct electricity.


b - A liquid was immiscible with water and was found to be flammable

2007-02-07 04:58:58 · 3 answers · asked by Anonymous in Chemistry

is pluto is still existing as a planet or a star

2007-02-07 04:58:19 · 10 answers · asked by sufera 1 in Astronomy & Space

Solve the fractional equations.
1. 3/2a - 5/6 = 2/3a

A. 0
B. 1
C. 3/2
D. No Solution

2.
(x-4)
------------- = 2
(x-2)

A. 4
B. -1
C. 0
D. No Solution

2007-02-07 04:56:46 · 8 answers · asked by Anonymous in Mathematics

2007-02-07 04:55:37 · 2 answers · asked by Jean D 1 in Astronomy & Space

3x + 2y=10
6x=5x+26
how do you solve this solution

2007-02-07 04:55:36 · 9 answers · asked by Anonymous in Mathematics

If we put a conductor between two oppositely charged particles, what will equipotential lines look like?

2007-02-07 04:52:56 · 4 answers · asked by Anonymous in Physics

Hi everyone, I am working on my the synthesis of alum. And now I am just not so sure of the fact that if in the process, we don't cut the aluminum sample into small pieces, but rather left it as one large piece; then will this oversight affect the % yield of alum afterwards? My opinion is that it won't affect the % yield of alum at all. And could anyone know about this stuff please help me out! I need an accurate answer! I'm seriously working on this lab. And please also tell me why it won't affect the % yield of alum, of if it does affect, will the % yield of alum be too high or too low? Thank you very much!

2007-02-07 04:52:42 · 3 answers · asked by cowgirl 1 in Chemistry

We never get any snow worth talking about ...

2007-02-07 04:52:36 · 6 answers · asked by Anonymous in Weather

People say when it snows you can tell by the colour of the clouds, but surely they will be grey?

2007-02-07 04:51:14 · 7 answers · asked by Anonymous in Weather

Question Details:
The two strands of the helix-shaped DNA molecule (the genetic matieral in living cells) are held together by electrostatic forces as shown. Assume that the net average charge indicated on H and N atoms is effectively 0.2e, and on the indicated C and O atoms is 0.4e, that atoms on each molecule are seperated by 1.0 X 10^-10 m, and that all relevant angles are 120 degrees. Estimate the net force between:
(a) a thymine and anadenine; and
(b) a cytosine and a guanine
(c) Estimate the total force for a DNA molecule containing 10^5 pairs of such molecules.

The answers in the back of the book are


a) 3 x 10 ^-10 N

b) 7 x 10^-10 N

c) 10 ^-4 N

Thanks for your help....

2007-02-07 04:51:09 · 1 answers · asked by crockett_1969 2 in Physics

just need to know how to make fahrenheit to celsius....like our temperature right now is 14 degrees fahrenheit. so what would it be in celsius? thanks! :)
♥

2007-02-07 04:49:28 · 7 answers · asked by Tweetalette 3 in Other - Science

i dont know if a person race can be identified just looking at some genetic sample . however i would like to know if heaven forbid one day it would be possible for someone to use some sort of genetic weapon that would only harm one race. is that remotley possible now or in the near future. if not when if ever could this idea become the real thing

2007-02-07 04:48:01 · 3 answers · asked by Anonymous in Biology

2007-02-07 04:46:13 · 2 answers · asked by Anonymous in Medicine

2007-02-07 04:46:09 · 6 answers · asked by tomw91 2 in Mathematics

2007-02-07 04:45:19 · 5 answers · asked by Anonymous in Mathematics

2007-02-07 04:44:14 · 4 answers · asked by Anonymous in Engineering

In chem lab we did an experiment where we generated oxygen from hydrogen peroxide using manganese dioxide as the catalyst. We collected the gas in 5 bottles. In my chem lab report, I have to answer this question: "What is different about the composition of the first bottle of gas collected compared to the other four?" I was under the impression that they were all the same, so if someone would kindly explain it would be greatly appreciated.

2007-02-07 04:43:38 · 3 answers · asked by Jess 2 in Chemistry

erin's age is 3 times warren's. in 4yrs she will be twice as old as he will be. how old is each now? can you help me set up the equation?

2007-02-07 04:41:22 · 6 answers · asked by smoovstella319 2 in Mathematics

from the corners of the rectangular sheet of tin whose length is twice its width. What size sheet will produce a box having a volume of 112in^3 ?

2007-02-07 04:40:36 · 2 answers · asked by Anonymous in Engineering

whats good about taking them? thank you

2007-02-07 04:39:54 · 8 answers · asked by juicyfruitishandsome 4 in Medicine

do you ever think that humans will evolve to where we never need sleep again. i know more and more people are getting less and less sleep now adays. also there are people now that can only sleep for a few hours with days on end (the coach for the tampa bay bucs is a great example). i know people need sleep to repair their bodies, but if we are getting less sleep now, is it possible for us to evolve to the point to where we wont need sleep at all?

2007-02-07 04:39:09 · 10 answers · asked by Anonymous in Biology

(OK, please do not kid around now.. I'm being serious. The nail was not dirty(!))

I boiled a finger nail in NaOH for a while. It turned a bit more yellow than it was before. Then I added lead ions and the solution turned greyish-black! Why did that happen (chemically speaking)?

2007-02-07 04:38:45 · 4 answers · asked by maj 1 in Chemistry

750 fans
total amount made in ticket sales $6375
center section tickets cost $10
end section tickets cost $5
How many tickets are sold in each section?
How is this problem done?

2007-02-07 04:36:44 · 5 answers · asked by Anonymous in Mathematics

2007-02-07 04:35:10 · 3 answers · asked by Fissure 2 in Botany

Chlorofluorocarbons (CFC) act as catalysts for the destruction of ozone in the uper atmosphere.
Ultra violet light from the sun breaks carbon-chlorine bonds in CFC's.



CF2Cl2 ---> CF2Cl + Cl



The Cl atom reacts with ozone.



Cl + O3 ---> ClO + O2
ClO + O ---> Cl + O2



The direct reaction is
O3 + O --> 2 O2



Which of the following are true about these reactions ?



a) The direct reaction breaks down O3 at a faster rate than the same reaction where Cl is used as a catalyst

b) While Cl can be used as a catalyst, it will not appear as an intermediate in the resulting two-step mechanism

c) The presence of Cl provides a mechanism with higher Ea's than the direct reaction (in the absence of Cl)

d) DE (reaction energy) is the same whether Cl is present as a catalyst or not

e) When Cl is used as a catalyst it is a homogeneous catalyst

2007-02-07 04:35:00 · 4 answers · asked by sunyrob 1 in Chemistry

2007-02-07 04:34:51 · 14 answers · asked by X-Leb 1 in Mathematics

when the digits of a two-digit number are reversed, the new number is 9 more than the original number, and the sum of the digits of the original number is 11. what is the original number?

can you please help me set up the equation?

2007-02-07 04:34:14 · 9 answers · asked by smoovstella319 2 in Mathematics

When enzymes are present in very low concentrations, their effect on the rate of a reaction can be described using first-order kinetics. If the concentration of a catalyzing enzyme is changed from 3.45 × 10−3 M to 5.38 × 10−1 M, by what factor does the rate of the reaction change ?

2007-02-07 04:34:10 · 1 answers · asked by sunyrob 1 in Chemistry

2007-02-07 04:33:57 · 1 answers · asked by Gopal Paudel 1 in Mathematics

2007-02-07 04:33:06 · 2 answers · asked by chaunceyd06 1 in Biology