Science & Mathematics - 3 July 2007

Zn(s) / ZnCl2(aq) // Cl-(aq)/ Cl2(g)/ C(s)

In the electrochemical cell described by the cell diagram above, what reaction occurs at the anode?
a) Zn-> Zn2+ +2e-
b) Zn2+ + 2e- --> Zn
c) Cl2 + 2e -> 2Cl-
d) 2Cl- --> Cl2+ 2e
e) Zn+ Cl2 --> ZnCl2

answer is A but i dont get it
i dont get what the "diagram" is trying to tell me either

by the way, the "/" slanted lines in the diagram are supposed to be straight lines but i made them slanted to make it look less confusing

2007-07-03 19:01:33 · 4 answers · asked by Anonymous in Chemistry

8 - 5(4 - 3x) = 2(4 - x) - 8x
( a + 2) ( a^2 -3a + 7)
simplify : ( 3x^2 y) ( -2xy)^3
solve: square root of 4x - 2 = square root of 3x + 9
Is square root of x^2 - y^2 = x - y ?

2007-07-03 18:56:22 · 8 answers · asked by bettylee 1 in Mathematics

Basically if one nucleotide was substituted within a gene what would most likely affect the structure of the protein coded for by that gene.

2007-07-03 18:48:19 · 8 answers · asked by Asiya B 1 in Biology

2007-07-03 18:30:09 · 28 answers · asked by tazholic84 1 in Astronomy & Space

2007-07-03 18:21:46 · 4 answers · asked by Pablo C 2 in Weather

this is my psychics... i dont get it! so im kinda stuffed. please help me out

2007-07-03 18:20:46 · 13 answers · asked by rooney8 2 in Physics

2007-07-03 18:19:22 · 7 answers · asked by Anonymous in Agriculture

They think that genetically altered crops might be the cause, though the companies that make the seeds for these crops and most of the corporate companies that wholesale grow them ignore these claims and keep right on trucking. Do you think that this obvious display of corporate-bottom-line-greed will harm our agriculture permanently?

2007-07-03 18:18:55 · 6 answers · asked by Elvenlost 2 in Agriculture

2007-07-03 18:16:55 · 7 answers · asked by Anonymous in Physics

2007-07-03 18:16:22 · 8 answers · asked by Mohammad H 1 in Mathematics

We regrow our skin, our hair, our nails, the cells in our body - why must we die?
Why is there nothing in nature that lives forever? Why is all life intrinsically mortal? Why can't organisms continue to ingest energy from sunlight and other life?

2007-07-03 18:13:42 · 12 answers · asked by tom t 1 in Biology

simplify the expression
( 3^x +3^-x)^2 - (3^x - 3^-x)^2

the answer is 4 but i need to know the steps of how to do it so please show detail

2007-07-03 18:01:27 · 10 answers · asked by fhsdjfsd 2 in Mathematics

amounts of natural gas and/or oil." Does that mean what I think it means, which is 10 to 1 they have found gas or oil.

2007-07-03 18:00:27 · 7 answers · asked by Delta/Bravo 3 in Earth Sciences & Geology

A chemist has 84 ounces of a solution. He pours the solution into test tubes. Each test tube holds 2/3 oz. How many test tubes can he fill?

2007-07-03 17:52:11 · 10 answers · asked by fondagoodman1 2 in Mathematics

2007-07-03 17:51:03 · 14 answers · asked by jeffrey w 1 in Physics

2007-07-03 17:50:23 · 13 answers · asked by Bill W 【ツ】 6 in Mathematics

that has the shape and magnitude of our own sun?

2007-07-03 17:49:17 · 7 answers · asked by lifescircle 5 in Astronomy & Space

2007-07-03 17:33:48 · 7 answers · asked by adrian 1 in Biology

I came across a weird information that watermelons are originally colourless(white?) before they are cut . When cut , there's some rapid reaction which induces the red colour. Is the info. true?Whats the reason if so?

2007-07-03 17:31:28 · 17 answers · asked by aaa 1 in Botany

2007-07-03 17:18:38 · 9 answers · asked by Anonymous in Other - Science

2007-07-03 17:16:29 · 13 answers · asked by brookbabe90 5 in Biology

I was wondering if it were possible for dark energy to exist in my living room or bed or bathroom or in the grocery store?

2007-07-03 17:08:31 · 9 answers · asked by internationalman1919 1 in Astronomy & Space

Hard to imagine a brand new color.

2007-07-03 17:04:23 · 18 answers · asked by Funnel 5 in Astronomy & Space

I just want to know why planets/moons are circles and not any other shape.

2007-07-03 16:57:00 · 13 answers · asked by onetwofiveman 1 in Astronomy & Space

Is there as much human variation internally as there is externally? I'm in anatomy class and I'm studying cadavers and my TA will say "This is kind of strange..etc. he/she has an extra vein, or is lacking a bone, or a ligament." How common is this and to what extent to we vary on the inside. I just thought of this because we are all clearly extremely different on the outside..does that carry over into the inners? Does anyone know of an interesting article about human variation that goes into this?

2007-07-03 16:54:35 · 3 answers · asked by Anonymous in Medicine

If the ball lands 8.7m from the point on the ground directly below the edge of the platform, what is the height of the platform?

2007-07-03 16:50:39 · 5 answers · asked by Josh Muller 1 in Physics

The current flows at .50 m/s.
A) At what angle(s) must the boat be steered?
B) How long does it take to make the round trip? ( assuming that the boat's speed is constant at all times, and neglect turnaround time.)

2007-07-03 16:44:58 · 3 answers · asked by Josh Muller 1 in Physics

Please don't direct me to other sites, just how does subliminal messaging work? Is there like a sound wheel, where each sound has an opposite or something? Or is it that the sounds are just reversed, like Molly is eellom, or Jordan is nadroj?

2007-07-03 16:26:14 · 1 answers · asked by jordanwj19 2 in Other - Science

i assume its because the gas is so dense, but just not sure

2007-07-03 16:25:36 · 11 answers · asked by bucsandbolts 1 in Astronomy & Space

2007-07-03 16:22:37 · 10 answers · asked by ted75 3 in Biology