Science & Mathematics - 6 September 2007

What is the pH of a solution which contains 0.0516 moles of sodium acetate and 0.1204 moles of acetic acid?

acetic acid Ka = 1.8*10^-5

2007-09-06 06:56:02 · 1 answers · asked by jon st. germain 1 in Chemistry

ok so now i have this question that i have been trying to figure out since yesterday and idk what they are wanting me to say im just not sure about this one. any help would be appreciated thank you!

2007-09-06 06:54:58 · 15 answers · asked by Anonymous in Physics

2007-09-06 06:50:19 · 6 answers · asked by TeganMc 2 in Zoology

example= 9x^2=144

2007-09-06 06:49:25 · 10 answers · asked by Cassia M 1 in Mathematics

the distance between A and B is 100 km .
B is east of A.
2 vehicles start travelling at the same time,one from A and the other from B.
Both go east.
they meet after 10 hours.
the vehicle that started from B goes 4 km in (t+2 minutes) time when the vehicle started at A goes 4 km in t time.
what are the speeds of the 2 vehicles?

I know the answer is 30,40 km/hour .
I need the way

2007-09-06 06:47:31 · 1 answers · asked by Anonymous in Mathematics

describe three exampes in velocity from sportsin which a force changes the velocity of an object or person.... i think i have one?
i said when a bat hits the baseball the ball changes in speed and direction.
is that correct? and if so i just need two more examples

2007-09-06 06:46:09 · 3 answers · asked by Anonymous in Physics

did lance bass ever go into pace? why not( if the answer is no). Can anyone go into space?... even if you arent astronauts?

2007-09-06 06:40:09 · 8 answers · asked by Anonymous in Astronomy & Space

Do you know an analitical way to obtain the tan 22.5°. Without using a calc

2007-09-06 06:39:19 · 3 answers · asked by logivan_net 3 in Mathematics

i need answers to these questions please!

1. Research chemists discovered a simple way to reduce the amount of harmful nitrogen oxide in car
exhaust fumes. If a stream of ammonia gas is injected into the hot exhaust, the following reaction
happens:
6NO(g) + 4NH3(g) ® 5N2(g) + 6H2O(g)
a) What are the products of this reaction?
b) How much ammonia, NH3, would be needed to react with 18g of nitrogen oxide, NO?
c) Assume that the average distance travelled by a car is about 19,800km per year, and that the
average car emits 1g of nitrogen oxide per km.
How much ammonia would be needed for one car in a year?
2. a) Balance the following equation:
Fe2O3(s) + ¼CO(g) ® ¼Fe(l) + ¼CO2(g)
b) Iron(III) oxide is reduced to iron in the blast furnace according to the equation completed in
part (a). How much iron(III) oxide is needed to produce 112g of iron?
c) How much iron can be made from 320 tonnes of iron(III) oxide?

2007-09-06 06:37:16 · 7 answers · asked by Anonymous in Chemistry

What exactly is Thimerosal? Some people say its the cause of autism, but why? And why is it used in vaccines? What's its purpose?

2007-09-06 06:33:47 · 3 answers · asked by kelsey h 2 in Medicine

i have a question for you when you were in college, did you picked any short career with long medical requirement career?
for instance, if i need some training about medicine or like working in the hospital so what type of short career i can choose with medical requirement?
if you know any short career that related to medical field then please tell me!
thank you

2007-09-06 06:33:31 · 2 answers · asked by Anonymous in Medicine

ind?

2007-09-06 06:30:45 · 1 answers · asked by Anonymous in Mathematics

2007-09-06 06:30:09 · 12 answers · asked by Redbone Diva 1 in Mathematics

2007-09-06 06:29:50 · 7 answers · asked by Anonymous in Mathematics

stuck on this question

the line "l" with the equation 3x+y - 9 = 0 intersects the line "m" wth the equation 2x+3y-12=0 at the point A
a) Find, as exact fractions, the coordinates of the point A

the region r1 is bounded by l, m and the y axis
the region r 2 is bounded by l, m and the x axis

b) show that the ratio of the are of r2 is 25:18

thanks

2007-09-06 06:29:31 · 1 answers · asked by Anonymous in Mathematics

Huge icebergs can be seen only in small visible fraction. If the specific gravity of seawater and ice are 1.024 and .817, respectively, what is this fraction?

2007-09-06 06:29:22 · 2 answers · asked by physics maniac 2 in Physics

2007-09-06 06:25:23 · 7 answers · asked by flo8225 1 in Mathematics

They must be doing something ...Carl sagan was ripped yo ?

2007-09-06 06:22:42 · 5 answers · asked by ronald b 2 in Astronomy & Space

Effects of CFC?

2007-09-06 06:20:30 · 6 answers · asked by Sam 1 in Chemistry

2007-09-06 06:15:20 · 3 answers · asked by kieran.brady 2 in Other - Science

2007-09-06 06:15:01 · 21 answers · asked by lisa f 1 in Mathematics

2007-09-06 06:14:17 · 4 answers · asked by zaitzy 1 in Biology

2007-09-06 06:12:37 · 5 answers · asked by Anonymous in Earth Sciences & Geology

store sold 65 calculators making $3875 One was $15 and other was $67 . How many of each type did they sell ?

2007-09-06 06:11:34 · 4 answers · asked by kathy b 6 in Mathematics

2007-09-06 06:10:34 · 10 answers · asked by HammerDown1990 1 in Mathematics

This is something that i was told recently,this is not a subject i know alot about,but find really interesting! can you send atoms back in time?

2007-09-06 06:06:12 · 13 answers · asked by Anonymous in Astronomy & Space

2007-09-06 06:04:18 · 11 answers · asked by ashwini_pp2000 1 in Astronomy & Space

I just recently had an AC installed in my kitchen window, which just happens to be right outside the bathroom door. It was suggested to me that I should keep the bathroom door shut when the AC is on, because the AC could suck the moisture out of the toilet.

2007-09-06 06:02:44 · 4 answers · asked by tramps3 3 in Chemistry

Well ive got some homework and i dont know if its right or not, i cant check because my teacher took in our books (with ALL of our working on it) so please help

and dont be offensive. maths is difficult. i would appreciate some help.

1.On a map of scale 1:100 000 the distance between Tower Bridge and Hammersmith bridge is 12.3cm . What is the actual distance in KM?

am i right? 12.3 x 100 000 = 1230000
actually is it divide? PLEASE HELP!

and

2. The distance from herford to st albans is 32km. how far apart will they be on a map scale 1:50 000

HELP!

thank you

Teresa.

2007-09-06 05:58:39 · 12 answers · asked by Anonymous in Mathematics

what do i write to that becuase i dont relly get the question, im not stupid but just finding it difficult to understand it

2007-09-06 05:55:02 · 7 answers · asked by bal 1 in Engineering