Science & Mathematics - 7 October 2007

tangents with parametric curves.

2007-10-07 17:11:08 · 2 answers · asked by Robert M 2 in Mathematics

The catalytic decomposition of hydrogen peroxide can be expressed as:

2H2O2(aq) --> 2H2O(l) + O2(g)

A trial of this decomposition experiment produced the following data:


Volume of O2 produced at room conditions 240 ml
Barometric pressure 740 torr
Temperature of water 24oC
Temperature of O2 25oC
Vapor Pressure due to water at 24oC 22.4 torr


Calculate the volume of O2(g) produced at standard conditions of temperature and pressure. (enter your answer in liters)

2007-10-07 17:06:18 · 2 answers · asked by newtype603 2 in Chemistry

If electricity is the movement of free electrons across a conductor. Does the conductor or element (such as copper) change since it's losing electrons? or does the atom create more electrons on it's own? I'm thinking that the electricity cycles in a loop which means that the electrons are constantly returning to it's original atom. But when you get arc's or when a power line is cut and the loop is severed, how do the atoms get their electrons back?

2007-10-07 16:47:28 · 2 answers · asked by Top Gun 1 in Chemistry

I know you can't take Nyquil with an MAOI but I don't know if Azithromycin is a MAOI or GHB....anyone know if it's OK?

2007-10-07 16:43:38 · 6 answers · asked by Tricky 2 in Medicine

if a population of animals in a certain biome had limited space how do you think it would affect the predators? why

2007-10-07 16:43:04 · 2 answers · asked by Israel A 1 in Earth Sciences & Geology

2007-10-07 16:42:57 · 6 answers · asked by aienboy 1 in Physics

How do I solve this equation:
-x + 2 = 22

Steps, plz!

2007-10-07 16:41:17 · 11 answers · asked by Anonymous in Mathematics

1)5x-2y-z+2w=-44
2)3x+3y-4z+w=-27
3)-2x+4y+5z-2w=48
4)4x-5y+6z+4w=-23

now i tried 1 and 3, 2 and 3, 5 and 6 and none fit into the equations.

2007-10-07 16:39:32 · 2 answers · asked by m 1 in Mathematics

2007-10-07 16:39:00 · 4 answers · asked by Anonymous in Biology

what is the probablility that you will draw 2 hearts, a diamond, a spade and a club?

2007-10-07 16:36:43 · 2 answers · asked by star_wisher86 1 in Mathematics

2007-10-07 16:36:20 · 10 answers · asked by shebby1446445 1 in Mathematics

Find dy/dx
given y = e^(-2x) In(4x)

please show working out thanks

2007-10-07 16:34:34 · 3 answers · asked by Anonymous in Mathematics

To make an electric magnet they say you need a battery, wire and a nail but can a person make one without the battery? Like from a power cord of some sort? This is vert important - its for school.

2007-10-07 16:28:00 · 11 answers · asked by George W 1 in Engineering

I neeed help with these problems. im sorta stuck.

Simplify the expressions....

square root of 3 X square root of 27

square root of 18 X square root of 12

square root of 4 X square root of 63

square root of 1/16


square root of 9/25



thanks! =]

2007-10-07 16:26:16 · 5 answers · asked by bosstastic<3 3 in Mathematics

2007-10-07 16:25:15 · 1 answers · asked by essence_05 3 in Chemistry

(b) CuBr2 (aq) + NaOH (aq) ? (net ionic equation)

(c) AgNO3 (aq) + KI (aq) ? (net ionic equation)

2007-10-07 16:24:36 · 2 answers · asked by Circuiteer 1 in Chemistry

2007-10-07 16:22:58 · 7 answers · asked by feather252002 2 in Zoology

1. Find the number that must divide each term in the equation so that the equation can be solved by the method of completing the square: 5x^2 - 7x = 20


which is it???
[a] 20
[b] 5
[c] -7
[d] x

2007-10-07 16:22:27 · 8 answers · asked by vennysweetgirl21 3 in Mathematics

2007-10-07 16:20:03 · 4 answers · asked by cliffbear35 1 in Zoology

2. Solve by completing the square: 2x^2 + 6x - 2 = 0

is it:
[a] -3 +or- sqrt(13) /2
[b] -3 +or- 2sqrt(13) /2
[c] 3 +or- sqrt(13) / 2
[d] 3 +or- 2sqrt(13) /2

2007-10-07 16:17:15 · 5 answers · asked by vennysweetgirl21 3 in Mathematics

2007-10-07 16:16:36 · 8 answers · asked by probug 3 in Astronomy & Space

and why? I know the answer is no, i just don't understand why that is. Ten points !!

2007-10-07 16:15:12 · 8 answers · asked by sing.your.heart.out 2 in Mathematics

what do elements in the same period have in common?

How can one find the number of valence electrons for elements?
Ex: find the number of valence electrons for element F?

2007-10-07 16:12:23 · 4 answers · asked by Wii 2 in Chemistry

2007-10-07 16:11:07 · 3 answers · asked by Gideon 1 in Chemistry

find all pairs (x,y) (for x and y both real real numbers) satisfying the equation.

2007-10-07 16:05:59 · 4 answers · asked by Anonymous in Mathematics

2007-10-07 16:05:13 · 15 answers · asked by ZOOMZOOM 2 in Astronomy & Space

i know oil came from dead animals in the ground but animals die sometime and become oil if its the same as the other prehistoric animals. im confused

2007-10-07 16:04:44 · 6 answers · asked by Izzy 2 in Earth Sciences & Geology

The answers given are the following:
a. 35
b. 1.12
c. 25.8
d. 62.4
e. 39.3

2007-10-07 16:04:40 · 4 answers · asked by Anonymous in Chemistry

A rock is thrown vertically upward with a speed of 12.0 from the roof of a building that is 70.0 above the ground. Assume free fall.
Part A
In how many seconds after being thrown does the rock strike the ground?



Part B
What is the speed of the rock just before it strikes the ground?

2007-10-07 15:59:15 · 1 answers · asked by Mallory 1 in Physics

2007-10-07 15:56:18 · 4 answers · asked by sakura 1 in Earth Sciences & Geology