Science & Mathematics - 17 September 2007

In electrolytic cell, normally the metal in anode is oxidised to give out electrons and cathode takes electrons to from metal.
In zinc production, the anode is lead ( Pb) and the cathode is aluminium (Al) and the eletrolyte is zinc sulfate ( ZnSO4)
My question is why in the anode, the water is oxidised but not the lead metal???

2007-09-17 23:57:13 · 2 answers · asked by Anonymous in Chemistry

I buy Darwin and his evolutionary theories 100 %. One thing that puzzles me is how do genes for homosexuality get passed on, since presumably homos engage primarily in non reproductive sex. What selective pressure could their be to make this non reproductive behavior persist and how is it passed on? Of course, Im assuming that in many cases, genes play a part in a persons being gay or straight.

2007-09-17 23:54:22 · 12 answers · asked by Jeffrey P 3 in Biology

Ben Harper is originally from what California city?

2007-09-17 23:44:25 · 5 answers · asked by nancykep 3 in Geography

2007-09-17 23:43:20 · 18 answers · asked by Rahul 1 in Physics

need scientific answer and its possible for other color to appear

2007-09-17 23:43:05 · 3 answers · asked by rahul 4 in Other - Science

2007-09-17 23:41:18 · 7 answers · asked by Rahul 1 in Physics

Hi. I am currently taking my GED and I have major problems with math, particularly with basic word problems and algebra word problems. I do not understand how to solve them. I would greatly appreciate any advise on how to solve these word problems. Thanks.

2007-09-17 23:37:35 · 4 answers · asked by mao ying 3 in Mathematics

a. neutrophil
b. platelet
c. lymphoycte
d. red blood cell
e. monocyte

2007-09-17 23:36:45 · 5 answers · asked by Anonymous in Biology

a. stomach acids
b. sweat
c. skin
d. inflammation
e. lysozyme

2007-09-17 23:33:46 · 5 answers · asked by Anonymous in Medicine

sum(n on top r=1 at bottom)1/(4r^2-1)=n/(2n+1)

I have proved 4 1 n got 1/3 for both

now it wants me to prove for k

which i got n's as k's

its when k+1 that i just cant seem to get and answer at all and the examples i have got to help me with are all basics where the r's are straights powers ie ^2 not fractions as I have and I am really confussed

HELP!!!!!!!!!

2007-09-17 23:22:31 · 3 answers · asked by afro_orange 1 in Mathematics

the sea is salty because every fresh h2o stream has a small amount of dissolved salt in it. in the sea the salt becomes concentrated because the sun evaporates the h2o, leaving the salt accumulates. if this is so, why the amount of salt in the sea did not steadily increasing?

2007-09-17 23:21:37 · 4 answers · asked by dw1vdn 2 in Earth Sciences & Geology

1.K
2. S
3.Kr
4. Ba

2007-09-17 23:19:28 · 4 answers · asked by avenger 2 in Chemistry

that the earth and all of the other planets circle the sun

2007-09-17 23:15:11 · 3 answers · asked by dw1vdn 2 in Astronomy & Space

in europe.

2007-09-17 23:15:10 · 3 answers · asked by Anonymous in Geography

Hi I am really stuck on these questions and any help would be appreciated:

1. calculate the number of atoms present in 1.50g of silver (Ag)

2. calculate the number of molecules present in 4.75 millimol of phosphine (PH3)

3. calculate the number of moles of the positive ions present in 9.71 grams of barium phosphide (Ba3P2)

2007-09-17 23:10:53 · 1 answers · asked by Sammie 2 in Chemistry

2007-09-17 23:07:59 · 4 answers · asked by dw1vdn 2 in Astronomy & Space

A house with a 17.3 x 103 ft2 floor area and 8.00 ft high ceilings is to be heated with propane. How many kilograms of propane would be needed to raise the temperature of the air inside the house from 65.0 oF to
70.0 oF ?. In this calculation your are ignoring the temperature of the walls etc.

The moloar specific heat of the air inside the house is 30.2 J mol -1 oC -1
The average density of air over this temperature range can be estimated to be 1.22 g/L.
The molar mass of air is 29.1 g/mol.
There are 28.317 liters in a cubic foot.
The molar heat of combustion of propane is -2220.047 kJ/mol

2007-09-17 22:59:34 · 1 answers · asked by Bob L 2 in Chemistry

i was just laying in bed and i saw my curtains move. my windows are closed so it couldnt have been that. it just happened again. im not sure whats going on. i just turned my tv and fan off and i dont hear anything. it stopped now. that was creepy. what was it?

2007-09-17 22:48:43 · 16 answers · asked by Bloodforblondie 1 in Paranormal Phenomena

i'm looking for a good science fair project in biology........please help me..........can't u???

2007-09-17 22:45:46 · 1 answers · asked by dollar 1 in Biology

Apparently this is how many different combinations can be made from a 24 card Myriorama picture??

2007-09-17 22:41:58 · 11 answers · asked by Anonymous in Mathematics

The muzzle velocity of an armor-piercing round fired from an M1A1 tank is 1770 m/s (nearly 4000 mph or mach 5.2). A tank is at the top of a cliff and fires a shell horizontally. If the shell lands 6520 m (horizontally away) from the base of the cliff, how high is the cliff? Show work.

2007-09-17 22:37:35 · 4 answers · asked by Josh S 2 in Physics

I heard it was dexter but im not sure.
I'm curios as to what kind of cows this small herd in Opihikou is. They are pretty small, so I was thinking Dexter, but I can't really tell. Some of the cows are red, most black, (some mixed colors too). the guy who owns them says when he bought the land- they came with it, and he has no idea what breed they are. I wish I had a picture of them.

2007-09-17 22:14:50 · 2 answers · asked by happy_n_freeone 3 in Zoology

2007-09-17 22:13:13 · 10 answers · asked by Kent 1 in Mathematics

why is it important to plants and animals too?

2007-09-17 22:11:25 · 3 answers · asked by Anonymous in Botany

when was earth's moon discovered?
distance from earth?
rotational period?
orbital period?
what is the atmosphere made up of?

if anyone can answer the same things about jupiter or mars or saturns moons you'll get 10 points!

please help me!

2007-09-17 22:06:16 · 3 answers · asked by Anonymous in Astronomy & Space

Is it NaCl use in laboratory is the same with the table salt, so that we can infer that the table salt can be use to prepare NaCl solution also ??

2007-09-17 22:00:22 · 1 answers · asked by june y 1 in Chemistry

Please give names of elements and theie allotropes.

Note: give other than that of carbon.

2007-09-17 21:58:56 · 4 answers · asked by Here's The Champ 2 in Chemistry

Besides surgery, is there any medication available for treatment of renal artery stenosis.

2007-09-17 21:52:48 · 2 answers · asked by arg_16_in 1 in Medicine

Often you see the phrase associated with high voltage plasma tubes and lasers. I always fail to comprehend the meaning. I guess an increase in the flow of electrons (like a battery) but what about conservation of charge (Kirchhoff's current law), should there not be a deficit elsewhere, is it just that the electrons are accelerated? As you can see i am confused, anyone with any insight into this???

2007-09-17 21:51:06 · 1 answers · asked by Paine 6 in Engineering

2007-09-17 21:42:54 · 10 answers · asked by cdnquah11 1 in Astronomy & Space