Science & Mathematics - 9 December 2007

I need help! (im not askin you to do my hw if you could give me an answer and why it is the way it is that would be great)
they are multiple choice... even answering one would be helpful

1-Hot springs on the ocean floor near the mid ocean ridges provide evidence that
a) climate change has melted huge glaciers
b) marine fossils have been uplifted to high elevations
c) meteor craters and found beneath the oceans
d) convection currents exist in the asthenosphere

2- Evidence of subduction exists at the boundary between the
a) african and south american plates
b) australian and antarctic plates
c) pacific and anarctic plates
d) nazca and south american plates

2007-12-09 07:25:04 · 1 answers · asked by Anonymous in Earth Sciences & Geology

2007-12-09 07:24:59 · 2 answers · asked by jessejames2nice 1 in Earth Sciences & Geology

Consider the surface and solid of revolution of function y = √(2x-x²). From x = 0 to x = a, a > 0, the total volume is 0. What is the surface area?

2007-12-09 07:24:44 · 4 answers · asked by Scythian1950 7 in Mathematics

Why are the molecules of liquids harder than the molecules of soilds? Could you plz explain to me?

2007-12-09 07:19:11 · 1 answers · asked by Anonymous in Chemistry

2ln(3x-4)=7
please help me with this and explain it step by step if you don't mind.

2007-12-09 07:18:12 · 3 answers · asked by ashtreylil 3 in Mathematics

2007-12-09 07:16:08 · 12 answers · asked by King Of Utopia 2 in Biology

how the situation on mexico's flooding place is going

2007-12-09 07:15:53 · 3 answers · asked by Eder P 2 in Geography

an example problem is Propanoic Acid (CH3CH2COOH) has a Ka of 1.34x10^-5 . A 25.00ml sample of .100 mol L-1 propanocic acid is titrated with .100 mol L-1 NaOH solution, added from a buret.

a) What volume of NaOH is needed to reach the equivalence point?

b) Find the pH when 0.0 mL of NaOH is added.

I really need help with part B i figured out part A for the most part...i need to know where to start and what the heck to do. please help.

2007-12-09 07:14:30 · 3 answers · asked by not sure 2 in Chemistry

I'm getting confused about which is which because people refer to each system differently. Can you please explain to me which system uses what units?

2007-12-09 07:13:13 · 5 answers · asked by Anonymous in Mathematics

I just wanted to know.

2007-12-09 07:12:52 · 4 answers · asked by Harry 1 in Engineering

N P
hydrogen-2 (atomic number=1)

n stands for neutrons
p stands for protons

2007-12-09 07:11:40 · 2 answers · asked by Too CooL 3 in Chemistry

Consider the combustion reaction between 30.0 mL of liquid methanol (density = 0.850 g/ mL) and 15.0 L of oxygen gas measured at STP. The products of the reaction are CO2 (gas) and H20 (gas)

2007-12-09 07:11:11 · 2 answers · asked by plastickfourk 1 in Chemistry

If you are capable of answering seriously it would be appreciated and if your in need of attention please seek for your dunce hat elsewhere. ty

2007-12-09 07:10:31 · 4 answers · asked by Anonymous in Biology

2007-12-09 07:09:10 · 14 answers · asked by rachel 1 in Mathematics

This is supposed to be a single displacement reaction, and there was a forming of copper.

But the solution is supposed to be magnesium chloride, which is supposed to be colourless and transparent.

Instead, the solution formed in our experiment was light green and opaque. What happened?

2007-12-09 07:09:05 · 1 answers · asked by Teressa 1 in Chemistry

2007-12-09 07:07:39 · 2 answers · asked by Christy S 1 in Geography

2007-12-09 07:07:16 · 8 answers · asked by Anonymous in Astronomy & Space

QUESTION #1

Four stamps can be attached to each other in various ways. One way is shown here. In how many other ways might four stamps be attached?
☺ ☻ ♥ ♦ <-- Stamps.

QUESTION #2

What is the greatest amount of money you can have (in pennies, nickels, dimes, quarters, and half dollars) and still not be able to give change for a dollar?

QUESTION #3

It takes 4 and a half hours for a jet to fly from coast to coast. One jet leaves Los Angeles for New York at 4:40 p.m. while another jet leaves New York for Los Angeles at 6:00 p.m. Which plane will be closer to New York when they pass each other?

Thanks :)

2007-12-09 07:07:07 · 2 answers · asked by apples. 4 in Mathematics

2007-12-09 07:04:16 · 3 answers · asked by my_bad_mazda6_2003 1 in Biology

Assuming the following reaction proceeds in the forward direction,

Ni2+(aq) + Cr(s) → Ni(s) + Cr2+(aq)

a.Ni(s) is oxidized and Ni2+(aq) is reduced.
b.Ni2+(aq) is oxidized and Cr(s) is reduced.
c.Cr(s) is oxidized and Cr2+(aq) is reduced.
d.Ni2+(aq) is oxidized and Ni(s) is reduced.
e.Cr(s) is oxidized and Ni2+(aq) is reduced

2007-12-09 07:03:56 · 2 answers · asked by Anonymous in Chemistry

which isotope, when is bombarded with oxygen-18, yields the artificial isotope seaborgium-263 plus 4 neutrons?

1. nobelium-245
2. radium-259
3. californium-245
4. nobelium-249
5. californium-249

2007-12-09 07:03:47 · 1 answers · asked by Daone 1 in Chemistry

Solve by factoring.
Can someone please explain this to me step by step.
Thank you! I'm studying for my NYS Math Regents!

It reads: Two over x plus x plus two over x plus one is equal to seven over two.

2007-12-09 06:58:13 · 4 answers · asked by musicgirl 1 in Mathematics

2007-12-09 06:56:03 · 8 answers · asked by Anonymous in Astronomy & Space

Use the standard reduction potentials below to determine which element or ion is the best oxidizing agent.

Br2(λ) + 2 e- → 2 Br-(aq) E° = +1.08 V
Hg2+(aq) + e- → Hg(λ) E° = +0.86 V
Ni2+(aq) + 2 e- → Ni(s) E° = -0.25 V

a.Br-
b.Ni2+
c.Ni
d.Hg2+
e.Br2

2007-12-09 06:55:13 · 4 answers · asked by Anonymous in Chemistry

LIke what causes them to produce gases and what may those gases be?

2007-12-09 06:53:01 · 2 answers · asked by Marla I 1 in Chemistry

How do you solve this problem using elimination:

-3x+4y=29
3x=2y=-17

2007-12-09 06:52:50 · 8 answers · asked by holly 2 in Mathematics

2007-12-09 06:51:47 · 1 answers · asked by maria g 1 in Chemistry

It's for a project. I have the common ones like burning wood, candle, gas and baking i just need one more!
thanks.

2007-12-09 06:50:12 · 7 answers · asked by Anonymous in Chemistry

Mr. Petri has a rectangular plot of land with length=20 ft and width=10 ft. He wants to design a flower garden in the shape of a circle with two semicircles at each end of the center circle. He will fill in the remaining area with wood chips. If one bag covers 5 square ft, how many bags must he buy?

2007-12-09 06:49:55 · 1 answers · asked by I LOVE NEW YORK 1 in Mathematics

do all atoms have protons and neutrons

2007-12-09 06:47:27 · 3 answers · asked by Yasir Ali 3 in Chemistry