Science & Mathematics - 30 January 2007

Prior to performing a titration, three drops of phenolphthalein were added to 15.0mL of a tartaric acid solution. The solution was then titrated to the end point with 24.5 mL of 0.2297 M NaOH. What was the molarity of the tartaric aid solution?
I don't want just an answer please... I need to know how to do it!]
Thanks.

2007-01-30 06:53:36 · 2 answers · asked by woventemple 1 in Chemistry

what conditions/nutrients helps in the growth of bacteria and fungi

2007-01-30 06:51:06 · 1 answers · asked by hjhankhariya_4 1 in Botany

is it possible to determine the percent composition of ethyl alcohol in whisky and why?

is it possible to determine HgO in CuSO4*4H2O

it is possible to determine the percent composition of CaCO3 in KClO3 and why

2007-01-30 06:48:58 · 3 answers · asked by smile 1 in Chemistry

Did you know that if the sun dies out we will all die out? The reason why we'll die out is because we will have carbon dioxide which we will die from. How we dont have carbon dioxide is because plants are producers which means they make their own food. But although plants need sunlight, soil, water, and carbon dioxide to make their own food. Plants then give out oxygen for animals to live. (We are animals!)

2007-01-30 06:48:37 · 2 answers · asked by Anonymous in Earth Sciences & Geology

OK. I'm doing a report on isaac newton. what's a gr8 site 4 me that i can actually understand w/o having 2 read it 1,000,000 times & still not getting it?

2007-01-30 06:48:36 · 5 answers · asked by ♥Ѧƨԋʅɛץ ïи ωѳиԃԑᴙʅαиԃ♥ 3 in Physics

i need to compare the above electrical systems stating advantages and dis advantages plz help quick

2007-01-30 06:48:27 · 1 answers · asked by adrian w 1 in Engineering

Has any1 got any ideas for a small Science experiment that could be done at home or school! Has to be safe and has to have a reason behind it!

2007-01-30 06:47:29 · 8 answers · asked by ♥My Obsession Is You♥ 2 in Chemistry

like long distances or the height of a building

2007-01-30 06:47:15 · 3 answers · asked by dia 1 in Engineering

Campbell's is considering making an unadvertised change in one of its soups. They select 25 people and , using a double blind taste test, have each one of the 25 people taste both the original version of the soup and the new version. Each person is then asked to rate both versions of the soup.

Using a 95% confidence interval, the null hypothesis that there is no difference in the two versions of the soup is tested. This test is a paired t test, with 24 degrees of freedom. The calculated confidence interval is (2.00, 4.00), with a calculated t value of 3.00. The researcher who reports the results states, "We failed to reject the null hypothesis of no difference in the two versions of the soup because the calculated t statistic (3.00) is contained within the calculated confidence interval."

Critique this researcher's explanation.

2007-01-30 06:45:35 · 3 answers · asked by stuck 1 in Mathematics

I need to know how to solve a power that is a fraction in itself for example 5^(2/3)

2007-01-30 06:43:43 · 8 answers · asked by evanscs2006 1 in Mathematics

from a balloon 2500 ft. high, a command post is seen with an angle of depression of 77 degrees. How far is it from a point on the ground below the balloon to the command post, to the nearest tenth of a mile? the book says the answers is 3.5 miles but i dont know how to get that answer.

2007-01-30 06:42:59 · 5 answers · asked by WaLLy 1 in Mathematics

2007-01-30 06:39:43 · 23 answers · asked by M J 3 in Astronomy & Space

Hi,

Please provide solutions with step by work for each problem.

1) Simplify: 1/3x + (x ² +1)/(x ² -4x) - (x-2)/(9x-36)

2) Simplify: [(3/4)-(5/8)]/(3/8)

3) Solve: 1/3x + (x ² +1)/(x ² -4x) - (x-2)/(9x-36) = 1/3

4) Verify the identity: tan x(cot x + tan x)=sec ² x

5)Solve graphically: x ² -2x-6=8√(2x+7)

Thanks.

2007-01-30 06:39:40 · 4 answers · asked by blcklabelx 1 in Mathematics

As you read through a general report that contained the multiple regression model, you have noticed that the adjusted R-squared that has been reported is greater than the regular R-squared. Discuss the likelyhood of this occurence.

2007-01-30 06:38:59 · 2 answers · asked by stuck 1 in Mathematics

is true, why does the average distance between the earth and the sun not grow smaller?

2007-01-30 06:38:52 · 3 answers · asked by Anonymous in Physics

2007-01-30 06:36:44 · 2 answers · asked by goring 6 in Astronomy & Space

h uh?

2007-01-30 06:35:26 · 8 answers · asked by KAPPAx3 1 in Biology

Im 13 in 2nd year and i was doing an experiment to make oxygen with hydrogen peroxide and mangenese dioxide as a catalyst anyway i had to put this thing and there was water in it and (stupidly i cant believe i did it) i sucked the tube and founded it was a strong base! and then my teeth felt wierd ! but before us another class did how to make CO2 and they used hydrochloric acid and it might have been that i ate ! just a few drops ! please help i dont feel good and my teeth feel wierd.

2007-01-30 06:35:04 · 13 answers · asked by ? 2 in Chemistry

The cover that goes over the outside of the heat pump is an inch or more thick of white ice. All the way to the bottom on 2 1/2 sides. On the inside where the fan is; everything is fine. The fan has been running for several days. Non stop.
Does the ice on the outside bother the operation of the unit?

2007-01-30 06:32:46 · 5 answers · asked by Barbra 6 in Engineering

People keep saying that creationism is not a viable theory because it cannot make predictions. I have to disagree with that. I will now make two predictions based on the creationism theory. So far they have been correct.
1. We will not find microscopic life or any sort of incomplete ecosystem on other planets. (Not counting from earthly contamination.)
2. Life will not be able to be formed artificially from basic components.

Life on mars has been shown to be impossible. This was predicted by my theory. I have to think of some more, but those are the main two that affect the origin debate. I know some will say it will take time for those to be shown to be true, but I have no problem waiting. I will respond to answers a little but later. I have to go to lab.

2007-01-30 06:32:45 · 8 answers · asked by The GMC 6 in Biology

write the equation y = -3x + 9 in standardform with integer coefficients. pleasle help me. thanx

2007-01-30 06:32:28 · 5 answers · asked by shirandjoy 2 in Mathematics

2007-01-30 06:32:26 · 5 answers · asked by jesus-lives! 2 in Mathematics

Like physical movements of the space station, noises of something hitting the hull, Radical temperature changes also the same goes for the shuttle that was docked and some astronaughts had to go in there I wonder if they were in a place where they could see it take place or if it was visible at all?I believe this is a first for man or in earlier space days did we know it?

2007-01-30 06:30:40 · 2 answers · asked by mikef1234 3 in Astronomy & Space

2007-01-30 06:29:43 · 3 answers · asked by greg 1 in Mathematics

2007-01-30 06:26:05 · 55 answers · asked by Afzal Ali 1 in Zoology

Please help me with this question, and the other questions about a Crayfish.

2007-01-30 06:25:54 · 5 answers · asked by kapowww 1 in Zoology

2007-01-30 06:24:13 · 5 answers · asked by Anonymous in Paranormal Phenomena

I need help on the information of a crayfish. It would be good If someone were to give me a website on the parts of a Crayfish and the information of a Crayfish. Asap.

2007-01-30 06:24:13 · 2 answers · asked by kapowww 1 in Zoology

use these numbers
124 x 142

2007-01-30 06:23:52 · 7 answers · asked by Anonymous in Mathematics

Wondering if anyone is willing to help me with a few chemistry problems...

2007-01-30 06:23:30 · 5 answers · asked by ScarlettPink 1 in Chemistry