Science & Mathematics - 8 December 2006

2006-12-08 08:50:51 · 12 answers · asked by Salamander 2 in Engineering

1. A way to dissolve Gold is to oxidize it to Au3+. Nitric acid is typically a powerful oxidizing agent. There are two possible redox couple for nitric acid in acidic media: NO3- / HNO2 and NO3- / NO. Which couple would you expect to use in this case? and Why did you choose that?


2. Write the expected redox equation of the dissolution of Au in HNO3

2006-12-08 08:46:55 · 3 answers · asked by Uli S 1 in Chemistry

Find delta H and delta S for the sublimation of Mg. At what temp does Mg begin to sublime?

Mg(s) --> Mg(g)

2006-12-08 08:46:19 · 1 answers · asked by lilballerina007 1 in Chemistry

***= the one i chose

How many degrees is it from the North Pole to the South Pole?

a. 90
b. 180 ***
c. 360


2. Which continents are not crossed by the equator
a. Antarctica, North America
b. Antarctica, North America, Europe
c. Antarctica, North America, Europe, Australia ***



3. A haboob is a violent sandstorm. Where would you be most likely to find one?
a. A rain forest in Belize
b. The Sahara Desert ***
c. The Great Plains
d. The Himalayas



4. Which has sunrise first, eastern or western Africa? 2
a. Eastern ***
b. Western



5. On which continent is the Gobi Desert found?
a. Africa ***
b. Asia
c. Australia

2006-12-08 08:45:59 · 18 answers · asked by moneyman$$ 2 in Geography

i can do most of these, but i am stuck on this one.
Convert into a-h-k form by completing the square.
f(x)=x^2-3x+2
your help is greatly appreciated

2006-12-08 08:45:41 · 5 answers · asked by The Peacedog 2 in Mathematics

2006-12-08 08:40:10 · 17 answers · asked by ? 3 in Zoology

2006-12-08 08:39:54 · 6 answers · asked by bob 1 in Zoology

2006-12-08 08:39:13 · 19 answers · asked by Anonymous in Astronomy & Space

I am currently reading Brave New World in my English class, and my teacher asked our class to find any new advancements in science/technology that have some serious ethical issues behind them.

Ideas so far,
Cloning
Genetics in food, unkown long term side effects
???

Thanks for the help :)

2006-12-08 08:36:59 · 4 answers · asked by ninja 2 in Other - Science

2006-12-08 08:34:15 · 14 answers · asked by Anonymous in Astronomy & Space

it Bull Lovers Only!!...question in regards to appearance?
Do Pit bulls, in general, look better with short cropped ears; or with natural floppy ones..???

2006-12-08 08:33:48 · 6 answers · asked by Anonymous in Zoology

thank you to both people who answered, i really appreciate it, but this was the original equation and the use of solubility rules must be applied. i applied the charges and the solubility to the other equation to make it simpler but it was probably confusing. can someone please tell me how this equation would be predicted?

2006-12-08 08:32:44 · 2 answers · asked by soilikepink 1 in Chemistry

2006-12-08 08:32:43 · 8 answers · asked by Rick R 1 in Astronomy & Space

8m x 3.5m x 2.6m at £256 PER LINEAR METER

2006-12-08 08:32:40 · 5 answers · asked by ANDRE PIERRE A 1 in Mathematics

i want to know what is the richest country..is it the USA ?

2006-12-08 08:31:38 · 10 answers · asked by Boy 2 in Geography

2006-12-08 08:26:46 · 7 answers · asked by Anonymous in Geography

I have always wondered why monkeys fling feces at one another, people viewing them at the zoo, etc...

2006-12-08 08:25:52 · 7 answers · asked by Anonymous in Zoology

Need to write out and assignment on Cadmium (Cd 48th element) and the discoverer of it. Any freaky smart people that can help me?

2006-12-08 08:25:03 · 5 answers · asked by SED757 2 in Chemistry

Was the shock wave generated by it powerful enough to leave
physical evidence on the other side of the world, and would that
shock wave start seismic & volcanic activity that would make matters
worse?

2006-12-08 08:20:26 · 8 answers · asked by comedycatalyst 2 in Other - Science

if the sun were to vanish, would the gravitational force continue for the same period as the light, about eight minutes?

2006-12-08 08:17:51 · 9 answers · asked by paul j 1 in Physics

Consider the triangle ABC with vertices A(-6, -4, -2), B(-5, -5, -7), and C(-1, 4, -4). Which is the largest internal angle of the triangle?

ABC, BCA, or CAB?

WHAT is the size of this angle...?

HELP!

2006-12-08 08:17:23 · 3 answers · asked by Anonymous in Mathematics

2006-12-08 08:16:52 · 3 answers · asked by flip4it 4 in Weather

this must be solved with the solubility rules... so lost please help!

2006-12-08 08:14:26 · 2 answers · asked by soilikepink 1 in Chemistry

Consider the family function f(x) = e^x + k. What value of k gives the curve that is tangent to the line y = 4x+5?

I have tried solving this by taking the derivative of f(x) and sets it equals to 0 but it didn't work because k becomes 0 if I take it to 0, what should I do??

2006-12-08 08:12:54 · 4 answers · asked by Anonymous in Mathematics

2006-12-08 08:12:04 · 22 answers · asked by Tressa 1 in Mathematics

2006-12-08 08:11:43 · 5 answers · asked by chib1 1 in Physics

1: Simplify according to the rules for exponents.
35/32
2187
27
1/9


2: 210/26
1/16
116
16


3: 5/52
1/5
1/25
5


4: (1.16)2/(1.16)4
1/(1.16)2
12
(-1.16)2


5: (3.45)3/(3.45)-2
1/(3.45)2
(3.45)5
3.466


6: x-3/y-3
1
y3/x3
zero


7: 3r3/4r2
(3/4)r2
3/(4r)
(3r)/4


8: (10a2b3c)/(abc)
10ab2
10ab2c
(10ac)/b


9: (16a3b4c)/(8a3b6c2)
2a/b2c
2a/c
2/(cb2)


10: r2/r
1/r
r
1/r2


11: 1/x-1
x
x2
1/x


12: b-3
-3/b
1(b3)
1/b3


13: a-2c2
1/a2c2
c2/a2
1/a2


14: 1/(x-1 x-2)
x3
1/x3
x6


15: c3c2
1
c6
c5


16: (12a2b3)(-2a3c)
-6a5b3c
-24a5b3c
-12a6b3c


17: (-2a3b2c)3
-8a9b6c3
-6a3b2c
8a6b5c3


18: (2a4b2)/(a4b2)2
2a2
2/a4b2
4


19: (16x4y10z5)0
1/(16x4y10z5)
zero
1


20: (4m3)/(4m3)
16m9
zero
1

2006-12-08 08:11:41 · 9 answers · asked by me1026 1 in Mathematics

2006-12-08 08:08:40 · 6 answers · asked by ? 3 in Medicine

My choices are between a vulture and a Nile croc.
The croc is the largest and toughest predator in frica.With only only other crocs,humans, & hippos as enemys.But.When push comes to shove.The vulture is my choice.While other animals die in the harsh enviroment vultures are still thriving.They can handle the deadly viruses in dead animals.

2006-12-08 08:07:22 · 7 answers · asked by jkuraah 1 in Zoology

I really get stuck on this problem
All I know that I can get the answer by solving this equation
nC3=20

2006-12-08 08:05:07 · 7 answers · asked by shadab a 2 in Mathematics