Science & Mathematics - 12 July 2007

A stock solution of Calcium Chloride is 0.5574 molar. A 33.57ml sample of this stock solution is diluted to 500.00ml. Calculate the molaroty of the diluted solution?

2007-07-12 05:40:09 · 2 answers · asked by ... 3 in Chemistry

2007-07-12 05:40:07 · 4 answers · asked by country girl 1 in Geography

my viewpoint was from virginia and i was just wondering if anyone had any details such as how large and how close it came to earth.

2007-07-12 05:40:07 · 3 answers · asked by josh w 2 in Astronomy & Space

2007-07-12 05:38:17 · 4 answers · asked by Anonymous in Medicine

Oxalic acid reacts with hydroxide:
C2H2O4+2NaOH>Na2C2O4+2H2O

0.2567 grams of pure, dry oalic acid is weighed out and dissolved in an unknown amount of water, but less than 30 milliliters. This solutionis titrated to the phenolphthalein endpoint using a solution of NaOH of unknown molarity. It takes 27.35 milliliters of NaOH solution to reach the endpoint. Calculate the molarity of the unknown NaOH solution.

2007-07-12 05:38:03 · 2 answers · asked by ... 3 in Chemistry

the velocity of a particle moving in the +ve direction of x-axis varies as v = 5x^1/2 .assuming that at t=0,v=0.find the acceleration of the particle at x=1 metre.......??


a particle moves in the direction of east for 25 secs with a velocity of 15 m/s .then,it moves towards north for 8 secs with a velocity of 5 m/s.the magnitude of average velocity will be...............??

2007-07-12 05:37:29 · 3 answers · asked by shivam 2 in Physics

2007-07-12 05:32:25 · 4 answers · asked by i-sena 1 in Other - Science

If you titrate 1.502g of KHC8H4O4 with 37.28 ml of NaOH solution what is the concentration of the NaOH solution?

i got the eq. as KHC8H4O4+NaOH>KNaC8H4O4+H2O

Also, i know u need to know the number of moles to determine of NaOH in 37.28 ml or 0.03728l .

Pleas help

2007-07-12 05:32:03 · 3 answers · asked by ... 3 in Chemistry

150-5v-5v^2

First I put in descending order
-5v^2-5v+150

I then take out the common factor which in this case is (-5) and change my signs.

-5(v^2+v-30)

Then, Multiply 1(-30) which is (-30). I move on to find factors of (-30) that when added also give me the sum of 1v.

My answer is 5(-6).

Then I place them into my problem and factor by grouping....

(v^2+5v-6v-30)... and that yields v(v+5)-6(v+5)

When combined this is (v-6)(v+5)... and since there was a common factor that needed to be taken out in the beginning I also have to add that in to finally get my answer of...

5(v-6)(v+5)

My MathLab that I have to use to submit my homework is tell me that my signs are wrong and that the answer is 5(5-v)(6+v).

Why is this and what difference does it make?? I did all the steps as I was taught. Explain please.

2007-07-12 05:29:34 · 11 answers · asked by Anonymous in Mathematics

i made a shot glass outta flux core and i don't know if i can drink outta it. anyone know if its safe?

2007-07-12 05:29:12 · 6 answers · asked by lilbigmoe16 1 in Chemistry

it would be helpful if you could give me step by step directions into solving the problems.

1.Christina drove for six hours at an average speed of 45 mph. She drove 53 mph during the first two hours of her trip. How fast did she drive during the last four hours?

2. Jonathan drove to the beach which is one hundred eighteen kilometers away, at sixty kph. He drove home the next day at seventy two kph. How many hours in total did Jonathan drive?

3. Destiny drove to Jordan's house at 51 mph. Jordan's house is thirty nine miles away. Destiny arived at jordan's house at 2:58pm. What time did she leave?

2007-07-12 05:27:51 · 10 answers · asked by Anonymous in Mathematics

Looks kind of like cat eyes or something..... odd.

2007-07-12 05:25:20 · 15 answers · asked by ☆Bombastic☆ 5 in Paranormal Phenomena

find the rational roots of f. list any irrational roots correct to two decimal places
f(x)= x^4-2x^3-10x^2+14x+21

I haven't learned this yet so I am not sure how to begin or what I am looking for

2007-07-12 05:24:00 · 2 answers · asked by kimmeez 1 in Mathematics

A 5.00-L tank contains helium gass at 1.50 atm.

2007-07-12 05:21:50 · 4 answers · asked by Anonymous in Chemistry

Do different types of honey bees make different tasting honey? Are they the only insect that makes honey?

2007-07-12 05:21:18 · 8 answers · asked by awsmgman 2 in Zoology

2^201.......4^100.......8^70......16^50......32^39

2007-07-12 05:21:17 · 4 answers · asked by gkjsfh f 1 in Mathematics

Hi, i'm having a bit of trouble with a question here, if anyone can give me some pointers, it'd be really helpful.
Inside a small electron gun, an electron is passed through a potential difference of 100kV. Initially at rest, the electron emerges from the electron gun with a speed comparable to the speed of light.
Use the Newtonian expression for kinetic energy to estimate the electron's final speed.

OK, i know that the newtonian expression for kinetic energy is Ek=1/2 mv^2, but surely the final speed of the electron is the speed of light, or am i missing something here ?
I can work out the kinetic energy of the electron easy enough, but i thought i already had the speed, so what's going on here ?
Any help would be appreciated thanks.

2007-07-12 05:20:27 · 3 answers · asked by David M 1 in Physics

2Mg + O2 -- 2MgO

2007-07-12 05:19:08 · 4 answers · asked by Anonymous in Chemistry

multiply and simplify.

2x^2-2/x^2-6x-7 * (x^2-10x+21)

2007-07-12 05:15:36 · 2 answers · asked by Anonymous in Mathematics

find four ordered pairs that satisfy each equation. Use x values greater than -2 and less than 3.

1. y= x+ 3

2. y=9x-3

3. y=2x +7

2007-07-12 05:15:07 · 3 answers · asked by Anonymous in Mathematics

Marlene rides her bike to her friend Jon's house and returns home by the same route. Marlne rides her bike at constant speeds of 6 mph when going uphill and 12 mph when going downhill. If her total time riding was 2 hours, how far is it to Jon's house?

Any help would be appreciated!

2007-07-12 05:14:34 · 7 answers · asked by ariahimar 2 in Mathematics

Consider a 4% starch solution and a 10% starch solution separated by a semipermeable membrane

Not sure but is the answer: dialysis or osmosis??

2007-07-12 05:13:59 · 4 answers · asked by Anonymous in Chemistry

Why do people use silicon in solar panels for solar cars? I know they're semi-conductors but what is the actual reasons.

2007-07-12 05:13:49 · 3 answers · asked by Vijay B 1 in Engineering

25x^6+15x^5+2x^4

2007-07-12 05:12:34 · 3 answers · asked by Anonymous in Mathematics

My favorite scientist writing popular literature is Richard Dawkins, who's absolutely brilliant. That said, Gould had a bigger following, but since his death, I'm not sure that anyone is really filling that niche well. Sagan was great in his day, but again... I'm not thrilled by the other physicists writing these days.

I love to read, so feel free to throw in suggestions of books with your author names! And I don't care what branch of science... just looking for great books and writers. Thanks!

2007-07-12 05:12:29 · 8 answers · asked by Brad H 4 in Other - Science

Okay, so I was on my balcony of my apt. today and the building is covered in wood and their is wood covering the top of the balcony as well. I looked at one wall and noticed something I never noticed before...there was the huge ring of holes tiny holes in a ring pattern (looks like somebody took push pins and pushed it into the wood). There is a 'tail' on this ring too with holes as well kind of looks like this: .......O
It's a few ft.wide. Inside the ring area there are a few holes that are larger -like from screws or nails. I just now saw a wasp/bee something-I don't know- go into one of these larger holes. I have seen paper wasp nest before and there is nothing idicating that- plus this is on the wall--not on an overhang. Is there a huge colony here??? What should I do? How do I end this??? I have never been stung and so scared--there are HUNDREDS of tiny holes.......PLEASE HELP!!! By they way, I live in northern TX if it makes a difference.The wall is facing south/southwest.

2007-07-12 05:09:41 · 9 answers · asked by Sassafrass 6 in Zoology

On Yahoo's home page they have an article that the unearthed a baby mammoth in I believe it was Siberia, but to me it looks like a baby elephant. How can a person, not a scientist, tell the difference.

2007-07-12 05:06:04 · 7 answers · asked by Shashay 2 in Zoology

Does the rate of gasoline consumption go up as the volume of gas goes down or is it a constant rate?

2007-07-12 05:03:54 · 4 answers · asked by Anonymous in Physics

2007-07-12 05:02:15 · 15 answers · asked by SB_PORT BLAIR 1 in Engineering

Also I going to need the ph level of each or what color it turns when red cabbage indicator is added.

2007-07-12 05:00:34 · 5 answers · asked by Anonymous in Chemistry