Science & Mathematics - 10 October 2007

Oxygen,Zinc,and Iodine, Which One is likely to be a poor conductor of electricity and a brittle solid at room temperature ???

2007-10-10 07:16:31 · 5 answers · asked by Ben M 1 in Chemistry

2007-10-10 07:13:30 · 4 answers · asked by chris 1 in Physics

2007-10-10 07:11:03 · 15 answers · asked by Anonymous in Astronomy & Space

also how was the human race created

2007-10-10 07:10:38 · 23 answers · asked by Anonymous in Astronomy & Space

I would like to know what you like about the universe: big bang, string theory, black/white holes or anything else. Please provide some details. 10 pts. to the best answer.

2007-10-10 07:09:23 · 3 answers · asked by i am him 5 in Astronomy & Space

constant acceleration, HOW WOULD ONE GO ABOUT SOLVING THIS?

2007-10-10 07:07:37 · 4 answers · asked by a s 1 in Physics

It has been a long time since I have been at school, and I did pretty well at maths(at school level).

I work with numbers everyday and my basic understanding of standard maths is competant, I have realised browsing this section and other things although I am capable there is a lot I am completely unaware of.

I was wondering can I purchase some maths exercise books, GCSE level and above to refresh myself and learn more.

Any reccomended books I can purchase in the UK?
I am after things focused on exercises not explanation at this point.

2007-10-10 07:01:12 · 2 answers · asked by Link strikes back 6 in Mathematics

14 were male. Of the 67 that answered "no" to the question, six were male. If one person is selected at random, what is the probability that this person answered "yes" or was male?
a. 0.13
b. 0.39
c. 0.67
d 0.53

2007-10-10 06:59:01 · 5 answers · asked by Anonymous in Mathematics

his is the method I used:

2.0312 g of chalk / suspended in 100cm3 of water and 50cm3 of HCl(excess). Mixture is boiled for 1 minute then cooled and then its titrated against NaOH.

the Molarity of the HCL is 0.9931
the Molarity of the NaOH is 0.9931

the result of the titration is 9.9 (NaOH in the buirette and the excess HCl in the flask)

My calculation:

HCl(excess) + NaOH ---> xxxxxxx

moles of NaOH = (0.9931x10.00)/1000 = 9.931x10^-3 moles
1:1 ration with HCl so moles of HCl = 9.931x10^-3 moles

Moles of the HCl used at the start of the experiment = (0.9931x50.00)/1000 = 0.49655 moles

Amount of HCl used in the equation below = 0.49655 - (9.931x10^-3) = 0.039724 moles

CaCO3 + 2HCl ------> xxxxxxxx + excess HCl


its a 1:2 ration so 0.039724 / 2 = 0.019862 moles of CaCO3
Mr of CaCO3 = 100.087
Mass of CaCO3 = 100.087 x 0.019862 =1.988g
therefore Percentage w/w is 97.87%

does it look right?

2007-10-10 06:58:27 · 4 answers · asked by 421 4 1 in Chemistry

2007-10-10 06:53:22 · 3 answers · asked by gnasherr 2 in Physics

2007-10-10 06:48:49 · 1 answers · asked by Anonymous in Earth Sciences & Geology

(a) - What theorem guarantees the existence of an absolute maximum value and an absolute minimum value for f?

(b) What steps would you take to find those maximum and minimum values?

2007-10-10 06:45:23 · 3 answers · asked by sammiballer99 1 in Mathematics

(2x+y) (x+3y)

(3p+q) (3p+2q)

(3a-b) (2a+b)

(4p+2q) (3p-2q)


thanks so much i suck at algebra!!!

2007-10-10 06:44:10 · 9 answers · asked by Anonymous in Mathematics

Determine wehther the following conjecture is true or false.Explain your reasoning.if the conjecture is false, provide a counterexample. (remember that a conjecture is a guess based on incomplete evedence.)

for all integers a, b, and c, if a = b, then a/c = b/c

2007-10-10 06:43:25 · 4 answers · asked by Anonymous in Mathematics

Why?

2007-10-10 06:43:03 · 8 answers · asked by Anonymous in Mathematics

http://i40.photobucket.com/albums/e215/xxs3xp1stolxx/Picture29.png

2007-10-10 06:38:03 · 3 answers · asked by Anonymous in Mathematics

find the body's speed & acceleration of S= 8t - t^2 @ the endpoints of the interval 0<_ t <_ 5

2007-10-10 06:37:38 · 2 answers · asked by jewel7962002 1 in Physics

Why is extremely high pressure required to cause atomic nuclei to crash into one another in stars ??

2007-10-10 06:35:03 · 4 answers · asked by Ben M 1 in Physics

This is with the topic of Biotechnology and the bacterial transformation.

2007-10-10 06:34:38 · 6 answers · asked by Anonymous in Biology

at a football game, 200 souvenirs were sold, some at $1.50 each and the rest at $2.50 each.if the proceeds from the sales totaled $380, how many of each kind were sold?Let x represent the number of $1.50 souvenirs.

2007-10-10 06:32:04 · 12 answers · asked by Anonymous in Mathematics

Is there a table or a simple way to say eg.

If the universe (n) = 10,000 people, i need a sample of X people to get a confidence of +-5%


Thanks!!

2007-10-10 06:28:34 · 2 answers · asked by Anonymous in Mathematics

how can i prove that this can be divided by 11.
4^n+15n-1 ????????

2007-10-10 06:28:27 · 4 answers · asked by murzilka 1 in Mathematics

http://i40.photobucket.com/albums/e215/xxs3xp1stolxx/Picture25.png

2007-10-10 06:25:53 · 1 answers · asked by Ant J 1 in Mathematics

http://rgh.cc/displayimage.php?album=2&pos=-3004

2007-10-10 06:25:24 · 6 answers · asked by Father Ted 5 in Other - Alternative

2007-10-10 06:25:24 · 2 answers · asked by Anonymous in Physics

http://i40.photobucket.com/albums/e215/xxs3xp1stolxx/Picture23.png

2007-10-10 06:24:41 · 1 answers · asked by Ant J 1 in Mathematics

using a cross between Radar and global positioning sattelite. to make the flatter objects glow using vertical beams. do you think hes onto something. if it dont get into enemy hands?

2007-10-10 06:22:29 · 3 answers · asked by Anonymous in Engineering

find the body's speed & acceleration of S= -t^3 + 3t^2 - 3t @ the endpoints of the interval 0<_ t <_ 3

2007-10-10 06:21:40 · 2 answers · asked by jewel7962002 1 in Mathematics

http://i40.photobucket.com/albums/e215/xxs3xp1stolxx/Picture21.png

2007-10-10 06:20:17 · 2 answers · asked by Ant J 1 in Mathematics

2007-10-10 06:19:32 · 5 answers · asked by Blazenchat 2 in Medicine