Science & Mathematics - 27 November 2006

1.Calculate the standard molar enthalpy of formation for sulfur dioxide.

S(s) + O2 (g)---> SO2 (g)
Given the thermochemical equations below.

2S (s) + 3 O2 (g)-------> 2 SO3 (g)
enthalpy change= -791.5 kJ

2SO2 (g) + O2 (g) ---> 2SO3 (g)
enthalpy change= -197.9 kJ

2. The specific heat capacity of aluminum is 0.897 J/g.K. What quantity of heat (in joules) is required to heat 15.0 g of Al from 22.0 degrees celsius to 75.0 degrees celsius?

3. Determine the heat of vaporization of Titanium(IV) chloride given the enthalpiesof reaction below.

Ti(s) + 2 Cl2 (s)---> TiCl4 (l) enthalpy change= -804.2 kJ

Ti(s) + 2 Cl2 (s)---> TiCl4 (g) enthalpy change= -763.2 kJ

2006-11-27 08:46:34 · 2 answers · asked by Anonymous in Chemistry

negative 35 degrees F or negative 25 degrees F?

2006-11-27 08:44:39 · 10 answers · asked by Anonymous in Mathematics

The world record for free hen's egg throwing is 96.90 m, set in 1981. Assuming no air resistance, what would have been the (a) throwing speed; (b) elevation angle; (c) maximum height; (d) time of flight?
(Assume acceleration due to gravity = 10m/s/s)
This question is possible to answer!!!
Please show how you got the question..this would be a great help to me!!
And best of all...best answer gets 10 points!!!!

ok...i understand what everyone is saying...but in the test book these are the answers given...
(a)31.1m/s
(b)45 degrees
(c)+24m
(d)4.4s
if anyone can help show me how they got these anwers it would be a big help

2006-11-27 08:44:20 · 1 answers · asked by Brody 3 in Physics

...besides language...

2006-11-27 08:44:13 · 5 answers · asked by Anonymous in Geography

2006-11-27 08:43:59 · 6 answers · asked by Brenda B 1 in Weather

You operate a tour service that offers the following rates:

$200 per person if 50 people (the min number to book the tour) go on the tour

For each additional person, up to a maximum of 80 people total, the rate per person is reduced by $2.

It costs $6000 (a fixed cost) plus $32 per person to conduct the tour. How many people does it take to maximize your profit?

2006-11-27 08:40:44 · 4 answers · asked by Anonymous in Mathematics

and have to show that P lies on C, would I just substitute the numbers in?

2006-11-27 08:40:44 · 9 answers · asked by Andy P 1 in Mathematics

2006-11-27 08:40:19 · 6 answers · asked by mariepoole2000 1 in Geography

needs corrospondance course

2006-11-27 08:38:29 · 2 answers · asked by S. Girish 1 in Engineering

Anti-Gravity....Can anyone help me out here?

I'm a senior biochem major so I'm not exactly illiterate when it comes to this type of science but my older brother who is quite the theororiest was trying to explain to me how he read somewhere that someone had taken a sub atomic particle (I assume an electron) and used a superconductor and somehow created a gravitational field with it. He also mentioned how it broke one of the laws of thermodynamics but he can't account for which one exactly. There seemed to be a lot of holes in his explanation but it seemed to him to be some very promising findings in terms of future technology.

Does this sound vaguely familiar to anyone and could you elaborate on this? 10 points goes to the best and most helpful elaboration.

2006-11-27 08:38:07 · 4 answers · asked by Shortstuff71 3 in Physics

2006-11-27 08:36:55 · 10 answers · asked by Anonymous in Astronomy & Space

2006-11-27 08:36:12 · 5 answers · asked by Chad 7 in Astronomy & Space

My daughter has a cold and I give her medicine but since she dos'nt like medicine I have to mix it in her drink, problem is I usualy give her a half cup and her dose is only 1 teaspoon, does the medicine still have its full effect being mixed in a drink or is it's strenget diluted?

2006-11-27 08:36:11 · 4 answers · asked by pumpkin2 1 in Medicine

2006-11-27 08:34:47 · 6 answers · asked by smiley5671 2 in Mathematics

Hi. I'm getting ready for a discrete math final on Wednesday, and of all the topics I don't really "grok", chief among them is the principle of inclusion-exclusion and specifically the derivation of the formula for derangements.

I get it at a high level, but I was hoping maybe someone out there with a gift for explaining mathematical concepts well might have a go at trying to simplify the explanation for my benefit.

I'm aware of http://en.wikipedia.org/wiki/Derangement, but it's a little too formal for my taste. A link to a friendlier discussion would be great, however.

I would really appreciate it if people would avoid posting flippant answers like "I don't know, look it up" or "you must be deranged to ask such a question". There are lots of other questions out there you can use to get your 2 points.

Thanks in advance!

2006-11-27 08:34:17 · 4 answers · asked by Jim Burnell 6 in Mathematics

the numbers on the number line are negative 6,5,4,3,2,1 and positive 1,2,3,4,5,6,

2006-11-27 08:33:31 · 4 answers · asked by Anonymous in Mathematics

i don't know how to do this...i've tried several techniques..but none seem to be working..

2006-11-27 08:33:13 · 4 answers · asked by TeddyGrahams 1 in Mathematics

My laptop doesn't recognize when something is plugged into it. Like the power cord. Its from 2002 (I know its old) and the battery doesn't hold a charge anymore.

Someone told me it could be not recognizing anything because the battery is completely dead. Should i just buy a new battery and see if it works or will that not fix it?
Thanks

2006-11-27 08:32:36 · 3 answers · asked by Anonymous in Engineering

2006-11-27 08:30:48 · 4 answers · asked by girl516 1 in Mathematics

Why aren't they orbiting in random planes (but obviously at discrete distances from the sun, otherwise they would collide)? I would have expected the solar system to look like (how text books describe) electrons orbiting a nucleus. The same question applies to galaxies - why do they form spiral discs?

2006-11-27 08:30:43 · 11 answers · asked by go_on_tell_us 1 in Astronomy & Space

2006-11-27 08:30:28 · 1 answers · asked by ttybrs10 1 in Mathematics

If you have ever seen any, where and when was it? What did they look like, and where you alone or with someone at the time?

2006-11-27 08:30:21 · 8 answers · asked by jesshispet 3 in Astronomy & Space

I'm doing a project and can't find any. Thanks

2006-11-27 08:29:42 · 4 answers · asked by Anonymous in Engineering

I can't find the square root symbol of X, so i represented it with "square root".
1,Saying that 4< square root X < 9 is equivalent to saying what about X?

2, If the total cost X apples is b cents, what is a general formula for the cost, in cents, of y apples?

2006-11-27 08:29:33 · 3 answers · asked by PRINCESS Tiffany 2 in Mathematics

What are the lesions diagnostic of? The patient is 6 months old and was breast fed until 2months ago. What childhood disease did the infant experience? Why did the lesions erupt now? Why did this baby not have symptoms earlier? Is this at all dangerous?

2006-11-27 08:29:13 · 2 answers · asked by Anonymous in Medicine

Plzzzz help me i dont know which formula do i have to use for answer this question.
plzzzz explain me in a simple way and with formula.

2006-11-27 08:28:24 · 1 answers · asked by schoolgirl 1 in Physics

I want more details about these coursess

2006-11-27 08:26:31 · 2 answers · asked by zinabsalahabdallah 1 in Engineering

Pure water freezes at 0C and boils at 100C. Would tap water likely freez and boil at those exact temperatures?
Why or why not? please......help me


and next question is..
People often sprinkle salt on icy driveways and sidewalks. Would a substance like flour have a similar effect on the ice? explain....

2006-11-27 08:26:27 · 3 answers · asked by hey 3 in Chemistry

what is the mechanism through which smoking increases LDL in the circulation? could it poddibly involve a potential damage excerted upon LDL receptors? plz provide me with a satisfactory answer..... REEFERENCES PLAEASE!!!!!!!!!!!!

2006-11-27 08:25:18 · 3 answers · asked by dalhoomist 1 in Medicine

It is said that in ancient times a rich man with a bag of gold coins froze to death while stranded on a frozen lake. Because the ice was frictionless, he could not push himself to shore. What could he have done to save himself had he not been so miserly?

plzzzzzzzzzz help i dont know how to answer this .

2006-11-27 08:24:35 · 8 answers · asked by schoolgirl 1 in Physics