Science & Mathematics - 6 November 2007

Unknowns Formula weights (amu)
Copper(II) chloride dihydrate
Copper(II) sulfate pentahydrate
Copper(II) acetate monohydrate

Need to identify the formula weights for these compouds

2007-11-06 05:49:36 · 1 answers · asked by Anonymous in Chemistry

2007-11-06 05:49:13 · 4 answers · asked by marti 1 in Biology

in my coursework sheet it asks me :

how many moles of oxygen and how many moles of nitrogen are in 1.50 moles of ammonium phosphate?

can someone help me with this?

i have always had trouble on questions which ask the moles of a part of the compound. it really doesnt make sense.

2007-11-06 05:45:44 · 1 answers · asked by Anonymous in Chemistry

How exercise affects heart rate and breathing?

Thank you!!

2007-11-06 05:45:32 · 2 answers · asked by Emma 1 in Biology

plz need today in school

2007-11-06 05:43:55 · 7 answers · asked by bayotso 1 in Geography

2007-11-06 05:42:00 · 7 answers · asked by mark r 2 in Astronomy & Space

Answer the following questions based on dissolving ammonium nitrate in water. The balanced equation is given below.
NH4NO3(s)+H2O(1)+energy---> NH4+(aq)+NO3-(aq)+H2O(1)
1.based on the information given in the chem. equation, what temperature change would you expect in the reaction
2.Is this an endothermic or exothermic reaction?
3.List at least three of the everyday uses of nuclear reactions that you learned about
4.what radioactive technique is used to determine the age of fossils
5. List one advantage and one disadvantage of using nuclear power plants to produce electricity
6.Carbon -14 undergoes beta decay to become another element. What is the new element?What is the product of the radioactive decay?

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write the balanced equation for the following reaction: the fuel used in gas grills is called propane (C3H8) propane reacts with oxygen gas(O2) found in the air to produce carbon dioxide gas (CO2) and water vapor(H2O)

2007-11-06 05:40:39 · 2 answers · asked by Alexa I 1 in Chemistry

Find the total value of 17 rolls of nickels and 23 rolls of pennies if each nickel roll is $2 and each penny roll is $.50.

2007-11-06 05:37:49 · 9 answers · asked by karazee! 2 in Mathematics

2007-11-06 05:37:07 · 1 answers · asked by Anonymous in Physics

I really need to know how much money an ounce of the element Iodine is, please help

2007-11-06 05:34:30 · 1 answers · asked by believeeeeeee 2 in Chemistry

what is the purpose of the preset function on a J-K flip flop? It seems to me to be unnecessary. What am I missing?

2007-11-06 05:34:19 · 3 answers · asked by BooBoo 2 in Engineering

(summation notation) n=0 to infinity of k!(x-1)^k. The radius is supposed to be = to 0, but I'm stuck on the limits part (convergence test). Can someone help?

2007-11-06 05:29:39 · 1 answers · asked by AlwayzRottiez 1 in Mathematics

flow of electrons is current,matter consisits of atoms(electrons,protons and neutrons).
if current passes through matter like wire,movement of electrons takes place in matter then,how wire was stable without any decomposition because some of it's electrons flow away?

2007-11-06 05:28:34 · 3 answers · asked by venkatesh r 1 in Physics

2007-11-06 05:27:24 · 4 answers · asked by italianrae1986 1 in Biology

If a trait is adaptive can you please explain why and give an example

2007-11-06 05:26:33 · 2 answers · asked by Curious 2 in Biology

Eh.. Why is everyone all hyped up about 2012?
I know about the Mayan Calendar and all that...
But don't you think maybe that's just a silly prediction... ? >_>..
If anything, In 2012 we should be worrying about Global Warming -_-

2007-11-06 05:26:31 · 10 answers · asked by pj! 3 in Astronomy & Space

2007-11-06 05:24:29 · 1 answers · asked by hmassaf 1 in Earth Sciences & Geology

In animals, meiosis results directly in gamete production, while in plants meiospores are produced. Where do the gametes come from in the life cycle of a plant?

2007-11-06 05:24:15 · 1 answers · asked by Tony 1 in Biology

2007-11-06 05:23:52 · 6 answers · asked by hernan-jacob@sbcglobal.net 2 in Weather

like rain

2007-11-06 05:23:32 · 3 answers · asked by bryan J 1 in Weather

A 0.266-kg block is dropped straight downwards onto a vertical spring. The spring constant of the spring is 60 N/m. The block sticks to the spring and the spring compresses 0.14 m before coming to a momentary halt. What is the speed of the block just before it hits the spring?

2007-11-06 05:21:55 · 4 answers · asked by Bob P 1 in Physics

I heard something about computers exploding and what not.. >_>
Can anyone explain to me what was "Supposed" to happen in the year of 2000?

Thanks. [;

2007-11-06 05:20:21 · 19 answers · asked by pj! 3 in Astronomy & Space

I pretty much understand how it was created.I just want to understand the process of the beginning until now.
For example, in the beginning 4 parts divided ... gravity, strong, weak, electromagnetic.... stars formed from hydrogen, dust spinning.. collaspse of gravity... etc etc

I do have a seperate question.
Whats the difference between a supernova and a nebula?

2007-11-06 05:18:42 · 7 answers · asked by Jansen J 4 in Astronomy & Space

mass at end = 100 kg, 25 cm potion from end. what position to make a 75 gram mass put the other in equalibruim? what mass would be at 90 cm to put it in equalibrium?

2007-11-06 05:18:07 · 1 answers · asked by howdy 2 in Physics

prove that Lt x->inf. x{sqrt(x^2+sqrt(x^4+1))-x sqrt(2)}=0
and also prove that Lt x->inf.{cos(sqrt(x+1))-cos(sqrt(x))}=0

2007-11-06 05:17:01 · 1 answers · asked by Anonymous in Mathematics

Please anwser! I'll award with 10 points (:

2007-11-06 05:16:25 · 3 answers · asked by ERiKA ! 3 in Biology

A 60kg person at 25m/s makes a left turn with a 75 m radius and the friction is .600 between her and the seat. will she slide on the seat. and if so what is her friction?

2007-11-06 05:13:40 · 1 answers · asked by howdy 2 in Physics

You can use any materiels. By the way it is an 8 by 8 box. In other words we are doing an egg drop.

2007-11-06 05:11:10 · 8 answers · asked by Anonymous in Engineering

Please help me solve this problem
If you can please write step by step
The Problem is:
A 70 kg climber is supported in a chimney by the friction forces exerted on his shoes and back, which are in contact with the vertical walls. The coefficients of static friction between his shoes and the wall and his back and the wall are 0.8 and 0.6 respectively. What is the minimum normal force he must exert? The normal force he exerts is the same for both walls?

Thanks

2007-11-06 05:10:54 · 2 answers · asked by Anonymous in Physics

without finding the length of the side of the square.

2007-11-06 05:09:41 · 1 answers · asked by Mathman 1 in Mathematics