Science & Mathematics - 28 September 2007

2Mg + O2 = 2MgO
4Fe + 3O2 = 2Fe2O3
2Cu + O2 = 2CuO

2007-09-28 07:28:48 · 1 answers · asked by Anonymous in Chemistry

2007-09-28 07:26:32 · 16 answers · asked by Natalie N 2 in Astronomy & Space

2007-09-28 07:25:25 · 9 answers · asked by Anonymous in Astronomy & Space

Water conservation is very important here in California. So, to help the environment, and save water for future use.... I have decided to give up peeing into a toilet.
The next time I feel the urge to go, I will simply open my zipper, and do it on the front lawn when nobody's watching.

This way, I can save water, by not having to flush the toilet (3 gallons) and I can put nitrogen back into the soil.
Is this good for the environment ?

What do you guys think ?

2007-09-28 07:24:59 · 11 answers · asked by Whitman Lam 5 in Earth Sciences & Geology

2007-09-28 07:22:44 · 3 answers · asked by pradeep p 1 in Physics

16. at 525 mm Hg and 85 degrees C, the volume of a sample of nitrogen gas is 26.8 L. what is the volume at STP?


A. 1 L
B. 10.9 L
C. 15.3 L
D. 15.3 L c, and d are same it shows on the test?...

2007-09-28 07:19:33 · 3 answers · asked by Anonymous in Chemistry

2007-09-28 07:19:01 · 3 answers · asked by Synchronizers 3 in Engineering

Consider the sections of two circuits illustrated above. Select True or False for all statements. Rab (parallel circuits) Rcd( series)
1. After connecting c and d to a battery, the current through R3 always equals the current through R4.
2. Rcd is always less than or equal to R3.
3. Rab is always less than or equal to R1.
4. After connecting a and b to a battery, the voltage across R1 always equals the voltage across R2.

2007-09-28 07:17:48 · 4 answers · asked by Anonymous in Engineering

A. dry ice melts
B. water is able to freeze
C. ice remains frozen
D. food stored in a freezer becomes freezer burned

2007-09-28 07:15:33 · 4 answers · asked by Anonymous in Mathematics

i saw a video in google about a man farting with a fire. i thought "is that possible?". i've been thinking about it for hours.

2007-09-28 07:14:52 · 13 answers · asked by Jennette L 1 in Chemistry

the manner in which dyes such as food coloring spread through a liquid is an example of which of the following?

A. sublimation
B. evaporation
C. diffusion
D. condensation

2007-09-28 07:13:16 · 5 answers · asked by Anonymous in Mathematics

2007-09-28 07:13:12 · 6 answers · asked by Alexander 6 in Physics

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor:

4NH3 + 5O2 ® 4NO + 6H2O
What is the theoretical yield of water, in moles, when 40.0 g NH3 and 50.0 g O2 are mixed and allowed to react?

2007-09-28 07:13:10 · 1 answers · asked by PiNk-PrInCeSs 3 in Chemistry

A. pounds per square inch
B. small whole number ratios
C. large whole number ratios
D. pounds per cubic inch

2007-09-28 07:10:55 · 2 answers · asked by Anonymous in Mathematics

hello i am learning how to solve problems in physics using components and i know how to use components generally but this question just makes it a little bit more complicated: here is it and i will really appreciate the help of how to solve it thanks alot

A watercraft with Vi = 6.4 m/s[E] undergoes an average acceleration of 2.0 m/2^2 [s] for 2.5 s. what if Vf of the watercraft?

the answer in the back of the book is 8.1 m/s [E 38 S]

again thanks alot

2007-09-28 07:09:46 · 2 answers · asked by Anonymous in Physics

C'est ok pour l'infiniment grand mais j'ai du mal à saisir l'infiniment petit .

2007-09-28 07:09:46 · 3 answers · asked by Anonymous in Physics

What if I ignore the imaginary unit in the fast fourier transforms equation?

2007-09-28 07:09:15 · 1 answers · asked by Anonymous in Mathematics

passes through (-5,3) and is perpendicualer to the x-axis



thats the question im suppose to write and equation of the line having the following properties.




help

2007-09-28 07:07:46 · 3 answers · asked by jessy 1 in Mathematics

help, need a general formula

2007-09-28 07:05:05 · 7 answers · asked by Anonymous in Mathematics

Suppose that an observer at Alpha Centauri could detect a wobble in the Sun due to the motions of its planets. Is the Sun's wobble more likely to be due to Jupiter or Earth? Explain answer.

2007-09-28 07:04:13 · 5 answers · asked by inging 1 in Astronomy & Space

Voyage 1 is a spacecraft that is approximately 100 AU from the Sun. Many comets in the Oort Cloud reside at 1000 AU or more from the sun. the Ooct Cloud comets are bound to the Sun, but voyage 1 is not. Explain Why voyager1 is not bound to the Sun despite being closer thatn the oort Cloud comets.

2007-09-28 07:02:36 · 4 answers · asked by inging 1 in Astronomy & Space

passes through (-5,3) and is perpendicualer to the x-axis



thats the question im suppose to write and equation of the line having the following properties.




help

2007-09-28 07:02:09 · 3 answers · asked by jessy 1 in Mathematics

2007-09-28 06:59:16 · 5 answers · asked by delkkis 1 in Mathematics

2007-09-28 06:57:48 · 12 answers · asked by Anonymous in Mathematics

We're doing nearest-neighbor and sorted-edges algorithms in class, but what I don't understand is the sorted-edges algorithm. Isn't it the same as the nearest neighbor algorithm when started from the smallest edge?

2007-09-28 06:51:14 · 2 answers · asked by Anonymous in Mathematics

The amount of water used to wash clothes is directly proportional to the amount of time that the washer is in use. A wash lasting 24 minutes requires 12 gallons of water. Find the amount of water used in a washing clothes lasting 10 minutes.

2007-09-28 06:50:44 · 5 answers · asked by mouser 1 in Mathematics

2007-09-28 06:50:31 · 1 answers · asked by Anonymous in Botany

If M is parallel to N, is N parallel to M? Explain.
If M is parallel to N and N is parallel to P is M parallel to P? Explain.

2007-09-28 06:48:32 · 8 answers · asked by gurlygal 1 in Mathematics

If the universe is expanding it must be expanding into something. What do you think is on the outside of the universe?

2007-09-28 06:45:43 · 8 answers · asked by R C 3 in Astronomy & Space

What is the structure in "higher" plants that is disseminated and must become established to complete the life-cycle?

2007-09-28 06:45:41 · 3 answers · asked by Anonymous in Biology