Science & Mathematics - 23 November 2007

i need to know the stuff that i need so that these plants can survive...

2007-11-23 11:43:25 · 1 answers · asked by basiiio 2 in Botany

is it true that you can only use suffixes for covalent compounds and can use suffixes and stock system for ionic compounds or is it only stocksystem for ionic compounds?

2007-11-23 11:39:24 · 1 answers · asked by PARH PATEL 1 in Chemistry

2007-11-23 11:33:25 · 24 answers · asked by Anonymous in Geography

2007-11-23 11:26:52 · 3 answers · asked by Anonymous in Weather

this deals with an experiment for hydrogen ion concentration and buffer solutions and it requires one equation

2007-11-23 11:26:48 · 2 answers · asked by precious 1 in Chemistry

2007-11-23 11:24:53 · 2 answers · asked by Anonymous in Chemistry

i have some problems here about chem and i have a hard time recalling how to answer these..
anyways, i have my own answers to these but im not really sure if i got the right answers.

please help me try these out..
:)

1.a standard sol'n to be used for UV-Vis analysis is prepared by dissolving 0.0702 g of reagent grade Fe(NH4)2(SO4)2 .6H2O in water to a volume of 1L. What is the conc'n in ppm Fe??

2. What is the molarity of K+ in an aqueous sol'n that contains 63.5 ppm of K3Fe(CN)6??

3. describe the preparation of 2L of 0.108 M BaCl2 from BaCl2.2H2O.

2007-11-23 11:24:46 · 1 answers · asked by simply 3 in Chemistry

2007-11-23 11:23:43 · 10 answers · asked by TiNk b 1 in Astronomy & Space

are mitochondria alive? most biologist believe that mitochondra were originally ree-living prokaryotes that, in the course of time, took up residence inside eukaryotic cells. if that is the case, are mitochondria alive?

2007-11-23 11:23:20 · 5 answers · asked by kunga92 1 in Biology

2007-11-23 11:22:35 · 4 answers · asked by yani 2 in Mathematics

2007-11-23 11:18:27 · 9 answers · asked by Anonymous in Biology

Copper metal can be recovered from an ore containing CuCO3 by the decomposition reaction:

2 CuCO3 --------> 2 Cu + 2 CO2 + O2

What mass of copper ore, in tons, is needed to produce 500.0 lb of Cu if the ore is 13.22% by mass CuCO3? Assume complete decomposition of the CuCO3.

I solved the problem to 0.4861 tons of CuCO3 needed to produce 500.0 lb Cu. I'm not sure that's correct, because when I tried to use the 13.22% by mass of the ore to calculate how much ore is needed, I got an answer different from on the answer key. Help?

2007-11-23 11:09:19 · 2 answers · asked by Anonymous in Chemistry

2007-11-23 11:09:09 · 2 answers · asked by ribbon 2 in Zoology

2007-11-23 11:08:21 · 7 answers · asked by simplesimon 5 in Astronomy & Space

What is the Valence Electron Configuration for Potassium?

2007-11-23 11:00:03 · 3 answers · asked by Leslie 2 in Chemistry

I was thinking about laser therapy or maybe oxygen.I want to be perfectly healthy thank you.Any suggestions are welcomed.

2007-11-23 10:59:41 · 11 answers · asked by Anonymous in Biology

i need to know how to determine if an equation is linear or not.thanks for any help

2007-11-23 10:54:55 · 7 answers · asked by . 3 in Mathematics

I am really fascinated by this kind of stuff, Nanotechnology, but I am not sure if I will be able to find a job about this in Canada, especially in the Southwestern Ontario area, Kitchener/Waterloo/Cambridge/Guelph/Toronto, and what would be on the best universities to go to for this field?

2007-11-23 10:53:22 · 2 answers · asked by Anonymous in Engineering

etc. woods, civilised location etc..please show your source if any, website etc. thankyou

2007-11-23 10:49:14 · 6 answers · asked by sdjfhdkjsfgkuae 2 in Engineering

2007-11-23 10:45:59 · 3 answers · asked by Anonymous in Chemistry

Find all values of n such that x^2 + bx + (b/2)^2 = n
A. one real root B. Two real root C. two imaginary roots

2007-11-23 10:43:49 · 2 answers · asked by andy l 1 in Mathematics

I posted my question in detail at Cramster.com at
http://answerboard.cramster.com/math-topic-5-146463-0.aspx

Any help/suggestions/hints are greatly appreciated.
Thank you for your time!

2007-11-23 10:39:58 · 2 answers · asked by Anonymous in Mathematics

a kennel owner has 164 feet of fencing with which to enclose a rectangular region. He wants to subdivide this region into three smaller rectangles of equal length. If the total area to be enclosed is 576 square feet, find the dimension of the entire enclosed region. (hint: write an expression for l in terms of w)

2007-11-23 10:35:29 · 3 answers · asked by andy l 1 in Mathematics

The question is that two objects make a head on collision and one is moving to the right which is assumed to be positive while the second is moving to the left. The first object is 4.9g with 12cm/s and it makes a collision with a 15g object moving at 15cm/s. I have to find the velocity of the first object after the collision. What I tried was px: m1u1-m2u2=m1v1+m2v2 and u2-u1=-v2+v1 what I got was 4.9*12+15*15=283.8 or -166.2 if it's moving to the left. Then I tried 4.9v1 + 15(v1-3)=283.8 or -166.2. Then I isolated to get v1 but I got the answer wrong for both cases. I just can't get the final speed and I don't know what else to try. I don't think I can use m1u1-m2u2=m1v1+m2v2 because I have two unknowns v1 and v2.

2007-11-23 10:33:18 · 2 answers · asked by Shane 1 in Engineering

If x^2 + y^2 = 25 and dy/dt = 6, find dx/dt when y = 4.


(remember, we're looking for dx/dt, not dy/dt)

2007-11-23 10:30:59 · 1 answers · asked by glass_commander 2 in Mathematics

2007-11-23 10:30:34 · 4 answers · asked by khaled a 1 in Chemistry

2007-11-23 10:21:18 · 5 answers · asked by Anonymous in Astronomy & Space

2007-11-23 10:20:59 · 5 answers · asked by Anonymous in Medicine

I have to use rational exponents to simplify the radical

2007-11-23 10:19:56 · 5 answers · asked by Anonymous in Mathematics

2007-11-23 10:16:40 · 2 answers · asked by Rossetto 4 in Astronomy & Space