Science & Mathematics - 26 January 2007

I am a science student, but not in physics, and would like to have a more solid understanding of quantum mechanics. Is there a book that is simple enough for laymen to understand?

2007-01-26 12:07:32 · 4 answers · asked by lb 3 in Physics

2H2(g) + O2(g) --> 2H2O(g) ΔH = −486.6kJ



Which of the following are true statements for the above chemical reaction ?



a) A phase change is involved


b) Two moles of hydrogen gas react with two moles of oxygen gas to
produce two moles of water vapor


c) Energy is absorbed by the system, the reaction species


d) If the reaction takes place at constant pressure, q = −483.6 kJ


e) ΔH for reacting one mole of hydrogen gas with a half mole of
of oxygen gas is −241.8 kJ

2007-01-26 12:06:54 · 3 answers · asked by Anonymous in Chemistry

For the following reaction to occur
MgSO4 → Mg2+(aq) + SO42−(aq)


the change in enthalpy must be −91.3 kJ/mol


How much heat (kJ) is lost or gained by 278.0 ml of water when 3.01 g of MgSO4 is dissolved in the water ?

What is the change in temperature ( oC ) for the above process assuming no heat is lost or gained by the surroundings ?

2007-01-26 12:06:34 · 1 answers · asked by Anonymous in Chemistry

tyty

2007-01-26 12:04:47 · 1 answers · asked by ILIKETOPARTYY~! 3 in Biology

For the following reaction to occur



MgSO4 → Mg2+(aq) + SO42−(aq)



the change in enthalpy must be −91.3 kJ/mol



How much heat (kJ) is lost or gained by 241.0 ml of water when 3.43 g of MgSO4 is dissolved in the water ?

2007-01-26 12:04:39 · 1 answers · asked by Anonymous in Chemistry

Someone I know told me that string theory was disproven. I doubt this but I am not really sure. He said it was disproven only a few months ago. Does anyone know the truth about this matter?

2007-01-26 12:03:24 · 11 answers · asked by Anonymous in Physics

is there any indication that other bodies in our solar system are getting warmer?

2007-01-26 12:03:17 · 4 answers · asked by reason4iam 1 in Astronomy & Space

Not google, or ask.com because they don't have the infomation i need.

2007-01-26 12:02:41 · 2 answers · asked by lilblondiy03 3 in Earth Sciences & Geology

2007-01-26 11:58:23 · 4 answers · asked by Anonymous in Earth Sciences & Geology

A Hour has 60 min's. What does a KW hour have?

2007-01-26 11:56:28 · 2 answers · asked by claytonleeshepard 2 in Mathematics

hi i have a question that says that:

t= p/(4d-a) and i am told that p=6.9, d=3.4 and a=5.

a) find the lower bound of t
b) find the upper bound of t

what does lower/upward bound mean?

2007-01-26 11:56:22 · 4 answers · asked by kath r 1 in Mathematics

Why is all of the sudden i hear this subject very frequent on the news? It's on there almost every time i open it up. Today it was how global warming makes avalances harded to predict... What a load of crap! What's tomorrow's? Global warming causes earthquakes?

2007-01-26 11:55:02 · 9 answers · asked by nukem_thebomb 3 in Weather

This is just another moment in which I have been given the ability to question the most simple concepts. (this is where your laugh may be inserted) So beside the question of “which came first, the chicken or the egg?” ha ha. I have honestly thought of another just as interesting question: If in our evolution we started with one male and one female(regardless of if it was in human form, monkey, dinosaur, etc) then the following is a run down of what would of happened(as sick as it may seem)

Male has sex with female to produce a child.
Now that child has to either have sex with parent OR wait for the parents to have another child of the opposing sex so that they can have sex together, gosh this all sound like a bunch of incest! But then how else may we have evolved?

2007-01-26 11:54:32 · 7 answers · asked by trphuong 1 in Other - Science

this function I am trying to figure out is y= 4x OVER or divided by x squared + 1 and having to determine the inverse I believe by exchanging x and y, but I can't put it together.

Alyssa

2007-01-26 11:52:51 · 4 answers · asked by Alyssa W 1 in Mathematics

There are so many sources of radio waves in the air constantly.

2007-01-26 11:51:16 · 4 answers · asked by bluh 2 in Physics

make RHS=LHS

2007-01-26 11:50:49 · 2 answers · asked by k j 1 in Mathematics

It is 6:45 on Friday, January 26th, and I want to know what the really bright star is in the southwest part of the sky near the horizon? Thanks.

2007-01-26 11:49:19 · 16 answers · asked by CardinalsFan1 3 in Astronomy & Space

Use the most convieninet method to solve the equation.
2x^2 + x - 3

2x^2 + 8x + 3 = 10

3^2 + 4x - 2 = 0

5x^2 - x - 2 = 0

6x^2 + 11x = -3

x^2 + 5 = 7x

x^2 indicates squared or to the whatever power.

HElp!

2007-01-26 11:47:18 · 6 answers · asked by milliondollarbaby16 2 in Mathematics

In an elementary school I recently saw some pvc pipe instruments, which where straight pipes that the kids dropped on the floor to make various notes sound. Does anybody know where I could find some measurements for making these?

2007-01-26 11:46:07 · 2 answers · asked by Jdiggity 2 in Engineering

10 poiints immediately for a good answer

2007-01-26 11:45:42 · 8 answers · asked by So Cal Cory 2 in Biology

10 points immiately for a good answer

2007-01-26 11:44:28 · 8 answers · asked by So Cal Cory 2 in Biology

Someone please explain this to me.

When we were studying about the Big bang theory in astronomy a couple months ago, I didn't quite get this: How could the universe and everything in it expand from a small mass of whatever? (Sorry I don't remember much, hence me asking this question.) Yes, I am Christian, and I understand that my faith affects how I believe on this topic. But I am seriously wanting to know. I mean, what *caused* this mass to expand?

I would appreciate serious answers and I am not trying to start a big huge debate here. thanks.

2007-01-26 11:43:40 · 4 answers · asked by grav♫ 2 in Physics

I have an assignment for school where I need to read a histogram, but the class did not go over how to read a histogram or how to calculate average or standard deviation.

Here's a picture of the histogram (follow this link): http://www.catanzareti.com/images/Kevin/histogram.jpg

The first question is: Estimate the average metallicity for stars with planets and for field stars.

The second question is: estimate the standard deviation of the field stars.

I don't know how to calculate these figures. Could someone help and explain how I'd find these?

THANKS!

2007-01-26 11:41:55 · 0 answers · asked by Y2Kev 1 in Mathematics

Find the slope of the line containing the following pts (3/8,-5) and (-1/4,-1/4). Also, could you please explain to me how you arrived at the answer?

I really appreciate your help!!! :)

2007-01-26 11:41:55 · 5 answers · asked by Anonymous in Mathematics

Properties of a celestrial body that are required for it to be considered a planet?

Why is pluto a planet?

How big does a celestrial body have to be to be considered a planet?

Even if you could mabe send me a cite where this is on that would be extremely helpful since im kind of having a hard time finding stuff.

2007-01-26 11:38:28 · 4 answers · asked by And kayla was like 1 in Astronomy & Space

2007-01-26 11:36:40 · 5 answers · asked by annita p 2 in Mathematics

2007-01-26 11:36:23 · 3 answers · asked by janemr83 1 in Chemistry

the Q is : 12x^2 -3 =?
i solve it like this : 3(4x^2-1)
so i don't know is that it..or i must complete it and do it like this : 3(4x-1)(4x-1)
thanx

2007-01-26 11:35:14 · 7 answers · asked by mermaid 1 in Mathematics

John likes 400 but not 300; he likes 100 but not 99; he likes 3600 but not 3700. Which does he like?


Does anyone know the answer?

2007-01-26 11:33:04 · 9 answers · asked by Anonymous in Mathematics

tangent, secant, chords, diameter,radius, arc etc

2007-01-26 11:33:03 · 5 answers · asked by need help 1 in Mathematics