Science & Mathematics - 8 August 2007

2007-08-08 10:27:15 · 3 answers · asked by fireblade_2001us 1 in Engineering

i got my test back and i dont know why i got this wrong??

can you please help me?
thanks

A researcher has an unknown biological compound that she knows is a triprotic acid. She weighs out 2.143 grams of the unknown acid, dissolves it in water, adds an indicator, and titrates it to neutrality using 81.99 mL of 0.1195 M NaOH. What is the molecular weight of the acid?
answer:_______ AMU

2007-08-08 10:24:36 · 3 answers · asked by Anonymous in Chemistry

(5/6)/(10/15) what do i have to do

2007-08-08 10:22:02 · 8 answers · asked by Anonymous in Mathematics

2007-08-08 10:14:35 · 3 answers · asked by Anonymous in Mathematics

This is not a question of evolution vs. creation. Suppose all humans were to leave Earth, leaving behind the current animal kingdom.... Would humans re-evolve on Earth, millions of years later ????

2007-08-08 10:13:22 · 9 answers · asked by gemini6187 2 in Biology

2007-08-08 10:03:40 · 2 answers · asked by Anonymous in Mathematics

I need some help.
just answer the ones that you can do.
1.) tan^-1(-1)
2.) sec^2(11pi/6)
3.) sin(csc^-1(-2))
4.) sec^-1(sec(-30º))

2007-08-08 10:03:12 · 2 answers · asked by b country90 1 in Mathematics

My uncle has a question he needs resolved. He has been wearing vinyl gloves and working with salt. A while ago he noticed that when using these gloves they broke down and if so, was this breakdown contaminating the food he was eating?

salt=nacl na=sodium a group 1 element.
structure of gloves is vinyl is ch2=ch-
the equal sign on the vinyl group means a double bond
single bond is 'ane'
double bond is 'ene'
triple bond is 'yne'
#1 posiibilty.......ch2=ch-na.......
this is going to food.
#2 possibly........nacl.......ch2...
???????
remember octet rule ......

Please help if you have any suggestions.

2007-08-08 09:56:00 · 3 answers · asked by Anonymous in Biology

I need this for my homework

2007-08-08 09:55:12 · 5 answers · asked by Jama_HollaAtCha 1 in Mathematics

the old evoutionary chart keeps getting proven wrong-this according to bill kimbel at the university of arizona-director of the institute of human origins. is this just more proof that we did no evolve from apes or fish as some would have us believe. the GOD option is looking more and more like the truth.

2007-08-08 09:55:04 · 9 answers · asked by BRYAN H 5 in Biology

A normal window has the shape of a rectangle surmounted by a semicircle of diameter equal to the width of the rectangle. If the perimeter of the window is 20ft, what dimensions will admit the most light (maximum area)

2007-08-08 09:50:15 · 4 answers · asked by Crew served weapon 2 in Mathematics

Provide facts or reasons why it could or could not.

2007-08-08 09:50:11 · 4 answers · asked by Vader's Apprentice 2 in Zoology

And, is H2S hydrogen sulfide?

2007-08-08 09:42:47 · 5 answers · asked by nightowl 2 in Chemistry

2007-08-08 09:42:08 · 3 answers · asked by Anonymous in Geography

All right, I got
x(sq rt x) - x
but it doesn't look right. There has to be some relationship between x and sq rt of x that I'm missing. Please help!

2007-08-08 09:40:20 · 10 answers · asked by Katie M 2 in Mathematics

I planted wild flowers but this has grown from the soil along with them. I have no idea what it is. It looks like a young tree, it's about a foot and a half tall right now and producing berries which are green at first then turn purple. there are 3 total growing around the same place the others are smaller. do you have any idea what kind of tree/plant it is? Here are the links for pics of the berries it's producing and the leaves.

http://i198.photobucket.com/albums/...

http://i198.photobucket.com/albums/...

2007-08-08 09:39:05 · 3 answers · asked by Kay 3 in Botany

I have one of those kitchen timers. I wanted to convert it into a timed switch, is there any way to do that. If so can you give me instructions.

2007-08-08 09:38:45 · 6 answers · asked by mexicanonfire 3 in Engineering

You still believe in them?
No one doubts that there might be extraterrestrial life, but how can they get here....isn't it impossible?

2007-08-08 09:38:43 · 11 answers · asked by Anonymous in Astronomy & Space

I don't understand much about "power", etc. I'd like to get him a really good one but one that won't 'break the bank'.

I'll be getting a Christmas Club check (around $1200.00) the beginning of October & wanted to be prepared on where to purchase so I don't have to rush around doing research (which I really don't know much about telescopes anyway, so I don't want to risk getting something cheesy) & then risk it not being in stock or not getting here on time after ordering........

Also, I'm not looking to spend all my Christmas Club money on him, LOL ! I do have a couple of other people to buy for......LOLOL !

Blessings

2007-08-08 09:36:22 · 5 answers · asked by einstein_bird 1 in Astronomy & Space

use the discriminant to determine the number of solutions of the quadratic equation, and whether the solutions are real or complex. Note: It is not necessary to find the roots; just determine the number and types of solutions

2007-08-08 09:30:13 · 2 answers · asked by Anonymous in Geography

Hello. I need to know the reaction product of the electrolysis of metallic chromium. Would it be enough to oxidize it to a +6 oxidation state and become chromic acid, or just chromic oxide or perhaps chromium hydroxide? Thank you.

2007-08-08 09:30:11 · 1 answers · asked by Jo Blo 2 in Chemistry

They're so pretty. I learned of zorses in Outside magazine and am curious to know more.

For those who haven't seen one of these beauties, below is an image of a zorse:

http://www.t-bar.org/animals/horses/zelda.htm

2007-08-08 09:29:38 · 4 answers · asked by granola*girl™ 2 in Zoology

(t+5)/8 - (t-2)/2 = 1/3

2007-08-08 09:28:08 · 4 answers · asked by Jake P 2 in Mathematics

We're moving from surface mount tantalum capacitors to surface mount ceramic capacitors. How do I properly size a ceramic capacitor in terms of rated voltage? With bulk tantalums we always spec a cap with a voltage that is twice or three times the nominal voltage of the circuit. Is there a similar rule for ceramics?

2007-08-08 09:24:18 · 2 answers · asked by Rick B 2 in Engineering

2x-3 over 4 + 5=3x

2007-08-08 09:19:32 · 3 answers · asked by Jake P 2 in Mathematics

We all know about the big bang..my question is after the big bang where did all the laws of maths come from after all without maths this universe would not exist..does this in istself not prove that there must be an intelligence behind it..that intelligence called god

2007-08-08 09:10:42 · 14 answers · asked by Anonymous in Astronomy & Space

In my life, I have been experiencing many psychic abilities, so I think. I believe that I have precognition, premonitions, intuition, telepathy, telekinesis, and a few more. I’m not so sure about these two but I also might have clairaudience and clairsentience. (I might have repeated some using different names, but I get kind of confused with them) Many things have happened for instance,when I was about 7 or 8, my family and I were going on this picnic trip with my mom’s officemates. As I was packing what I was going to bring, a voice in my head told me to bring my first aid kit and extra pants. I brought the first aid kit, but I ignored the pants. When we were there, my friend was biking then she fell of her bike, ripped her pants, and was bleeding. The first aid kit came in handy, but I didn’t have the pants.There have been a lot more, and I have one for each ability I think I have, but I just want to cut to the point that I think I am psychic and idk what I’m suppose to do.

2007-08-08 09:05:06 · 18 answers · asked by Joan G 1 in Parapsychology

If it feels like 108 shouldn't they just say the temperature is 108. By the way, this is really happening today in Atlanta. Too hot to breathe.

2007-08-08 09:04:31 · 4 answers · asked by Anonymous in Weather

A 2.00-kg metal object requires 5020 J of heat to raise its temperature from 20.0°C to 40.0°C. What is the specific heat capacity of the metal?

126 J/(kg • °C)

106 KJ/(kg • °C)

126 cal/(kg • °C)

142 kcal(kg • °C)

2007-08-08 09:04:15 · 4 answers · asked by Anonymous in Chemistry

2007-08-08 09:04:07 · 11 answers · asked by cowboysblow27 3 in Medicine