Science & Mathematics - 31 October 2006

2006-10-31 13:29:21 · 4 answers · asked by kathleen_gigantino 1 in Zoology

Calculate the standard enthalpy of formation for diamond, given that
C(graphite) + O2(g) → CO2(g) ΔH0 = –393.5 kJ/mol
C(diamond) + O2(g) → CO2(g) ΔH0 = –395.4 kJ/mol

Is it 1.9 or -1.9 and why?

2006-10-31 13:27:00 · 3 answers · asked by hmmm 2 in Chemistry

Project Tommorow and I need to know if Germanium the element is flammabel and its solubility.

2006-10-31 13:25:17 · 4 answers · asked by S 2 in Chemistry

I've one chemistry problem . If u don't know then wright i don't know i'll get to know that how many people have the courage to solve this simple question. My question is:-
500centimetre cube of a given soln s contains 9.0 gram of glucose(C6H12O6). What is the molality of the soln.?
Formula for molality is :-
Molality = mass of solute
__________________________________________
( gram molecular mass of solute).(mass of solvent)
Molecular mass of glucose is 180.

2006-10-31 13:25:05 · 3 answers · asked by Black Eyes 2 in Chemistry

2006-10-31 13:25:04 · 8 answers · asked by pumpmar 2 in Medicine

2006-10-31 13:24:36 · 9 answers · asked by Anonymous in Geography

2006-10-31 13:24:04 · 4 answers · asked by ? 3 in Physics

2006-10-31 13:22:50 · 10 answers · asked by Anonymous in Botany

hi, can somebody please tell me in which country Las Lomas is found? Is it in Canada or USA or another country? It's not in Trinidad, i had checked. Thanks. Happy Halloween! hope u guys had fun. bye.

2006-10-31 13:21:28 · 10 answers · asked by angel_4_u . 1 in Geography

Like when you put a bottle in your refrigerator and the water gets frozen the shape of the bottle will change,even if no air gets in?
I have anexplanation...but i figured it out on my own so i don't know if it's right(i am trying to find an explanation from scratch for "why does ice float")

2006-10-31 13:20:05 · 8 answers · asked by ?:)? 3 in Other - Science

a. NaI
b. K2SO4
c. NaCN
d. Ba(OH)2
e. (NH4)2SO4

2006-10-31 13:15:03 · 2 answers · asked by Catherine D 1 in Chemistry

2006-10-31 13:13:44 · 18 answers · asked by Anonymous in Botany

2006-10-31 13:13:24 · 7 answers · asked by brandon k 1 in Biology

2006-10-31 13:12:54 · 12 answers · asked by bignellrob 2 in Astronomy & Space

How are the graphs of y = 3x + 5, y = x + 5, and y = x + 5 alike? How are they different?

A. All have the same slope, but different y-intercepts.

B. All have the same y-intercepts, but different slopes.

C. All have the same y-intercept, but one slopes up to the right and two slope up to the left

2006-10-31 13:11:25 · 10 answers · asked by ~*bRiTtNaY*~ 2 in Mathematics

Water from a garden hose that is pointed 29° above the horizontal lands directly on a sunbather lying on the ground 4.1 m away in the horizontal direction. If the hose is held 1.4 m above the ground, at what speed does the water leave the nozzle?

2006-10-31 13:09:47 · 3 answers · asked by Anonymous in Physics

x2 + 6x – 7
x2 – 1
How do you solve this problem. Thanks

2006-10-31 13:07:31 · 10 answers · asked by neish 1 in Mathematics

During a head-on collision, a passenger in the front seat of a car accelerates from 13.3m/s to rest in .1 second. A 25kg child is thrown through the car. What is the weight of the child?

2006-10-31 13:07:29 · 4 answers · asked by cubscaps33 5 in Physics

just wondering.

2006-10-31 13:05:27 · 8 answers · asked by Sectionine 2 in Biology

Suppose that a 1000 kg car is traveling at 25 m/s. Its brakes can apply a force of 5000N. What is the minimum distance required for the car to stop?

2006-10-31 13:05:09 · 5 answers · asked by cubscaps33 5 in Physics

I was recently given back a math test for geometry today and my teacher took off something that I believe is right. I tried to prove that two triangles were congruent in a novel way (as she describes it.) Instead of using SAS or SSS or AAS or any other postulates/theorems, I did something that my teacher said doesn't exist in geometric theorems.

Here is the picture of the triangle from the test that I drew for you guys:
http://img413.imageshack.us/img413/1027/mathrl9.png

I am supposed to prove that the two trianlges in that picture are congruent. Everything in black was given to me in the illustration in the test. I drew in the red marks. Is there any theorem/postulate that can prove to me that the red marks CAN be there? Or is it just wrong all together? My teacher said that if I can find a postulate/theorem for this, she'll give me the points.

2006-10-31 13:04:21 · 5 answers · asked by Raï 3 in Mathematics

A person lifts a 4.9 kg cement block a vertical distance of 1.50 m and then carries the block horizontally a distance of 12.40 m.

How much work is done by the person in the process?
___J
How much work is done by gravity in the process?
___J

how do you do it?

2006-10-31 13:01:40 · 4 answers · asked by tingerpoo 2 in Physics

Suppose you have a solution that might contain any or all of the following cations:Cu2+, Ag+, Ba2+, and Mn2+. Addition of HCl causes a precipitate to form. After the precipitate is filtered off , and a solution of NaOH is added to the supernatant liquid until it is strongly alkaline. No precipitate is formed. Which ions are present in each of the precipitates? Which cations are not present in the original solution?

2006-10-31 12:59:59 · 2 answers · asked by Catherine D 1 in Chemistry

I can smell it

2006-10-31 12:58:46 · 2 answers · asked by Anonymous in Biology

2006-10-31 12:57:22 · 2 answers · asked by neish 1 in Mathematics

it is math homework, something to do with proportions, i do not get it!

2006-10-31 12:57:18 · 5 answers · asked by justsorki 1 in Mathematics

2006-10-31 12:55:32 · 11 answers · asked by Larry M 1 in Geography

I have a bad headache but don't want to take any Tylenol because I heard that you can get addicted to it in a sense and soon it won't have any effect on you- you will have to take stronger medicine. Is that true?

2006-10-31 12:55:29 · 11 answers · asked by Jellystar 2 in Medicine

the ph of duodenum

2006-10-31 12:53:49 · 7 answers · asked by Reivax 3 in Biology

2006-10-31 12:52:46 · 6 answers · asked by karelia 1 in Physics