Science & Mathematics - 26 August 2007

in microbiology, What does it mean to “fix” nitrogen or carbon?

2007-08-26 10:22:37 · 3 answers · asked by Sergio 1 in Biology

What does it mean to find the molecular formula for Calcium Bromide? Does that just mean CaBr?

2007-08-26 10:21:34 · 4 answers · asked by k102518 2 in Chemistry

Once again im back. im seriously considering a weekly installment of this. this time i am honestly lost and i have tried every possible thing i know to try and solve this problem. it goes exactly like this.

The counting numbers are listed in the triangular array shown below. in what row does the number 2007 appear(forgive me because im not sure if i can put the numbers in a triangle.)

1
2 3 4
5 6 7 8 9
10 11 12 13 14 15 16
17 18 19 20 21 22 23 24 25


please help me if you can and show all work that is necessary. thanks...

2007-08-26 10:12:39 · 4 answers · asked by Lil D 2 in Mathematics

I have a met a few people who claim homosexuality is a choice, and this combined with the evidence of over 1500 gay animals leads me to a connection that doesn't seem to make sense. I would like to know how these animals "choose" their sexual orientations, thank you.

2007-08-26 10:11:14 · 9 answers · asked by Anonymous in Zoology

2007-08-26 10:10:15 · 10 answers · asked by I hate Hillary Clinton 6 in Engineering

Determine change of H knot for the combustion of phosphine (PH3).

PH3(g) + O2(g) --> P4O10(s) + H2O(g) (unbalanced)

2007-08-26 10:09:33 · 1 answers · asked by EE 2 in Chemistry

2007-08-26 10:09:20 · 8 answers · asked by I hate Hillary Clinton 6 in Weather

I have chem problems here that are asking me to tell how many electrons there are in the nucleus of a given ion. Ex: How many in a chloride ion? I don't know how to do this and it just doesn't seem to be "clicking" Could someone please give me an example? Thanks!!!

2007-08-26 10:08:28 · 3 answers · asked by k102518 2 in Chemistry

I know how it happens, but is there a purpose for having tanned skin?

2007-08-26 10:06:07 · 11 answers · asked by vEngful.Gibb0n 3 in Biology

I was sent an email that said on August 27 at about 1230 a.m. you will be able to see Mars with the naked eye, that it will appear as big as the moon, but I havent been able to find any data to back this up.

2007-08-26 10:05:52 · 22 answers · asked by m c 1 in Astronomy & Space

When 60% of a number is added to the number, the result is 192. What is the number?

2007-08-26 10:04:49 · 6 answers · asked by Anonymous in Mathematics

Iron metal reacts with hydrochloric acid to give H2 gas and Fe2+ ions. If 5.8 g of iron is to be dissolved in 1.5 M HCl, what is the minimum volume of the acid solution required to react wtih all of the iron?

2007-08-26 10:02:08 · 2 answers · asked by EE 2 in Chemistry

Science report due...need some ideas...THANKS!

2007-08-26 09:56:42 · 4 answers · asked by mary1234 2 in Physics

2007-08-26 09:56:29 · 25 answers · asked by Anonymous in Astronomy & Space

2007-08-26 09:51:41 · 18 answers · asked by Anonymous in Mathematics

2007-08-26 09:47:55 · 4 answers · asked by Adawg 3 in Chemistry

Idenify each of the following as either phy or chem property:
a. It is virtually insoluble in water
b. It exists in several forms, e.g. diamond, graphite
c. It is a solid at 25 degrees celcuis and 1 atm
d. It reacts with oxygen to form carbon dioxide

THanks...

2007-08-26 09:44:31 · 2 answers · asked by MJR 2 in Chemistry

Its for homework

2007-08-26 09:41:45 · 10 answers · asked by Maddie G 2 in Mathematics

I just posted a question and got feedback that it is not possible to convert meters cubed to meters. I am a chemical engineering major and am working a problem. I am told benzene weighs 0.879 g/cm^3 and the tank it is filling is 2 meters in diameter and 4 meters long. I am told to derive a formula for the weight of benzene as a function of h, the height of the tank. I was thinking convert to meters then multiply by 4. Since I have been told I cannot convert different dimensions, do you have any suggestions as to how to tackle this problem.

2007-08-26 09:40:16 · 5 answers · asked by behindthemask 2 in Engineering

I said:
The scale of our understanding will always remain within the limits of our dimensions.
The paradox about "Big" is when it is too big, you can not see it.

Please develop and argument.

2007-08-26 09:39:22 · 10 answers · asked by Anonymous in Physics

2007-08-26 09:33:35 · 13 answers · asked by whisper2ya 2 in Mathematics

2007-08-26 09:32:43 · 4 answers · asked by concreterabbit 3 in Engineering

Was is the difference between the two?

2007-08-26 09:28:10 · 2 answers · asked by 400 runner 1 in Botany

how come animals such as cats,dogs, and bears and animal wildlife crap all look the same but humans don't?

2007-08-26 09:26:40 · 16 answers · asked by The Game 3 in Zoology

A woman on a bridge 77.0 m high sees a raft floating at a constant speed on the river below. She drops a stone from rest in an attempt to hit the raft. The stone is released when the raft has 6.50 m more to travel before passing under the bridge. The stone hits the water 3.10 m in front of the raft.

2007-08-26 09:19:45 · 2 answers · asked by slowphysicsstudent 1 in Physics

We have a posson living under our house and we don't mind it being there but he is digging into the garbage at night is there anyway to hid food around the yard at night so he eats and don't dig in the garbage and what do I put out I don't want to get to close so that he don't start coming up to humans

2007-08-26 09:19:38 · 10 answers · asked by Anonymous in Zoology

2007-08-26 09:17:45 · 7 answers · asked by STEW #2 account 3 in Biology

You are so, so nice.

1. (10). Worn-out and damaged red blood cells are destroyed in the
thymus gland
tonsils
spleen
lymph nodes

2. (12). Circulating red blood cells:
contain a nucleus
have biconcave disk shape
contain 30% of the body's hemoglobin
clot the blood to prevent its loss

3. (13). How is oxygen carried through the blood stream?
dissolved in plasma
on receptors on the red blood cell membrane
as an amino acid
on the iron portion of the hemoglobin molecule

4. (16). Identify the cell related to the manufacture of antibodies:
plasma cells
suppressor cells
lymphocytes
thrombocytes

5. (17): In order to form filtrate, blood flows from the glomeruli into:
Bowman's capsule
the arcuate artery
a proximal convoluted tubule
the renal pyramids

2007-08-26 09:17:31 · 3 answers · asked by Kirkylee 3 in Biology

Consider the reaction of 73.0 g of oxygen as follows:

4Fe + 3O2 2Fe2O3

How many moles of oxygen react?
How many moles of iron must react?
How many moles of product form?
What mass of product forms?

2007-08-26 09:16:08 · 1 answers · asked by Anonymous in Chemistry

okay here it goes...

one endpoint of a segment is (12,-8). the midpoint is (3,18). find the coordinates of the other endpoint.

a classmate tells you "findin the coordinates of a midpoint is easy. you just find the averages" is there any truth to it? explain what you think your classmate means.

find the 2 points on segment AB that divide the segment into three congruent parts. point A has coordinates (0,0) and point B has coordinates (9,6). explain your method.


thank you so much for your time and everything else

2007-08-26 09:15:39 · 2 answers · asked by Anonymous in Mathematics