Science & Mathematics - 6 October 2007

2007-10-06 20:15:17 · 6 answers · asked by j d 1 in Astronomy & Space

Because we did flaming testing in the Lab.

2007-10-06 20:13:41 · 3 answers · asked by carpe_diem 1 in Chemistry

2007-10-06 20:09:58 · 1 answers · asked by cute_lass585 1 in Physics

2007-10-06 20:08:43 · 2 answers · asked by cute_lass585 1 in Physics

I recently learned that when crystallizing something such as sulfanilamide, adding too much solvent (such as ethanol) results in little to no yield of purified crystals. Why does this occur?

2007-10-06 20:03:32 · 2 answers · asked by Heather Leigh 1 in Chemistry

I love looking at the stars at night it is so beatuiful. I have seen jupiter and its 4 moons through my brothers telescope over 20 years ago and I know how to find the big dipper what are good ways for a beginner in astronomy to develop a passion for looking and discovering the stars? Is there any special film to take pictures of the moon and the stars?

2007-10-06 19:58:42 · 8 answers · asked by encourager4God 5 in Astronomy & Space

2007-10-06 19:53:43 · 11 answers · asked by C Agostini 1 in Mathematics

2007-10-06 19:51:05 · 1 answers · asked by unni 1 in Earth Sciences & Geology

I heard that we can classify the plant and vegetable to Atype, Btype, O type and AB type. How do we do that?
Is there any special word for that?

2007-10-06 19:48:46 · 3 answers · asked by angel 2 in Botany

2007-10-06 19:47:25 · 4 answers · asked by Anonymous in Other - Science

For those of you with medical backround I have a question When I was examined by a doctor recently I was told I have high blood pressure and I felt at peace and not upset. I dont drink alcohol I dont smoke what are good healthy practical ways to lower blood pressure and make it more normal? This also runs in my family. Any suggestions?

2007-10-06 19:40:42 · 14 answers · asked by encourager4God 5 in Medicine

a narra tree and a coconut tree....opinion

2007-10-06 19:38:09 · 2 answers · asked by Anonymous in Botany

2007-10-06 19:37:07 · 2 answers · asked by Anonymous in Astronomy & Space

4 example in a 4 storey building, some kids are shouting and screaming and all.Is the noise louder or more distinct on the 4th storey thanthe 1st storey? Please give helpful links.

2007-10-06 19:36:10 · 7 answers · asked by ♫ Netz Squirrel ♫ 2 in Other - Science

2007-10-06 19:28:53 · 12 answers · asked by Sheed 4 in Biology

I've googled this and can't seem to find any useful information.

You explaining something or links to websites that are not too dumbed down are fine, but try not to list websites that are hard to follow.

So, Why do thunder and lightning occur?

2007-10-06 19:25:40 · 7 answers · asked by Anonymous in Weather

I noticed this on a clock at a shopping center in my neighborhood as well as a few grandfather clocks. Four is IIII instead of IV. Does that mean that any Roman numeral that has a four in it (e.g. 14, 24, 34) can have four I's instead of a IV? Also, 2 remain consistent, wouldn't "nine" be VIIII?

2007-10-06 19:24:17 · 12 answers · asked by The Glorious S.O.B. 7 in Mathematics

Why do some physics professors use 9.8 and some use 9.81 m/s^2 for the acceleration due to gravity on Earth?

2007-10-06 19:23:19 · 5 answers · asked by Bad M 2 in Physics

We'll be having our finals this tuesday and I need some help with the ff probs:

1.) A rectangular building whose depth is twice its frontage is divided into two parts by partition that is 30 ft from, and parallel to, the front wall. If the rear portion of the building contains 3500 ft^2, find the dimensions of the building.

2.) A man purchased some shares of stock for S1560. Later, when the price had gone up S24 per share, he sold all but 10 of them for S1520. How many shares had he bought?

3.) Draw a sketch of a line passing through the point P(-1,6) and having slope m = -2. Also sketch a line through the same point having slope m= -1/2

4.) Draw a sketch of a line passing through the equation 5x+2y-10=0 by finding the axis and y axis intercept?
**is the answer here (2,0) and (0,5)


****and oh, how do you do the find the equation that lies parallel to the given equation and the perpendicular one too...


thanks so much!!!
really need to Ace this exam..


hahaah

2007-10-06 19:21:19 · 4 answers · asked by crestfallen 5 in Mathematics

2007-10-06 19:17:26 · 17 answers · asked by Anonymous in Physics

The holes made will be used for cooling and venting.

2007-10-06 19:14:26 · 3 answers · asked by H@rry D 1 in Engineering

What would you do if you knew your child would be destined for hemophilia ? a learning disability? would society benefit or lose if such embryos were aborted?

2007-10-06 19:14:03 · 6 answers · asked by jaid 1 in Medicine

Okay so i wrote the balanced equation, and thats pretty much all i can do.. if someone can help me that would be so great.. thanks !

CH3C6H13(l) + O2(g) --> 5CO2(g) + 8H2O(l)

Write a balanced equation for the combustion of CH3C6H13(l) (methyl hexane)
-- i.e. its reaction with O2(g) forming the products CO2(g) and H2O(l).

Given the following standard heats of formation:

* deltaHf° of CO2(g) is -393.5 kJ/mol
* deltaHf° of H2O(l) is -286 kJ/mol
* deltaHf° of CH3C6H13(l) is -173.0 kJ/mol


What is the standard heat of reaction (deltaH°) for the combustion reaction of CH3C6H13(l)?

The next question is

Calculate the difference, deltaH-deltaE=delta(PV) for the combustion reaction of 1 mole of methyl hexane.
(Assume standard state conditions and 298 K for all reactants and products.)

2007-10-06 19:13:43 · 1 answers · asked by Anonymous in Chemistry

2007-10-06 19:13:42 · 7 answers · asked by hi mamu 1 in Earth Sciences & Geology

help! ;)<3

2007-10-06 19:12:07 · 3 answers · asked by Anonymous in Chemistry

2007-10-06 19:11:17 · 2 answers · asked by Glysil V 1 in Biology

2007-10-06 19:08:36 · 9 answers · asked by ♥Lady Dior♥ 3 in Other - Science

2007-10-06 19:07:50 · 6 answers · asked by Bobby K 3 in Earth Sciences & Geology

You have a large glass flask containing a small amount of acetone (boiling point = 56°C; freezing point = −95°C). The temperature of the flask is that of freezing water. What is the state of acetone in the flask?

2007-10-06 19:07:39 · 6 answers · asked by April 1 in Chemistry

2007-10-06 19:01:44 · 4 answers · asked by Anonymous in Astronomy & Space