Science & Mathematics - 25 November 2006

the half-life of radioactive carbon is 5600 years meaning that after every period of 5600 years only half of the radioactive carbon atoms remain. how long is it before a sample with ,10 to the power of six, radioactive carbon atoms decays enough so that fewer100 such atoms remain?

2006-11-25 17:38:07 · 3 answers · asked by tachyon excelerator 1 in Physics

A solution at 25 C is prepared by mixing 100 ml of liquid ethanol C2H5OH (density = 0.789 g/mL), with 200 mL of water (density = 0.997 g/mL). Assuming that the voumes add upon mixing, what are the molarity and molality of the solution, and the mass percent and mole fraction of the ethanol?

Step by step on how to do this problem would be greatly appreciated. thanks.

2006-11-25 17:34:54 · 2 answers · asked by vtxcuddlixgrl 1 in Chemistry

!!!From Maria son!!!

2006-11-25 17:33:56 · 7 answers · asked by MARIA O 2 in Earth Sciences & Geology

i know tat vision is produced because of the photons tat impinge on our retina....
so it givs us its energy right!!!!!!
so y do v feel strained if v watch tv 4 a long time

2006-11-25 17:32:23 · 7 answers · asked by sriraam h 2 in Physics

2006-11-25 17:30:08 · 4 answers · asked by imbecile 1 in Physics

I need a map in which rivers, mountains and other geographical features are indicated. I need a larger one that the names can be read.... don't forget only ASIA.

2006-11-25 17:26:25 · 4 answers · asked by zxcv 1 in Geography

2006-11-25 17:20:21 · 15 answers · asked by summervillechick06 1 in Zoology

Say that a red and white star have the same apparent brightness and are the same distance from the Earth. Which is larger and why?

2006-11-25 17:17:56 · 5 answers · asked by Michelles W 1 in Astronomy & Space

eloborated description of the genetic system of yeast.

2006-11-25 17:16:13 · 7 answers · asked by biotech.khursheed 1 in Biology

2006-11-25 17:15:40 · 5 answers · asked by Michelles W 1 in Astronomy & Space

2006-11-25 17:13:24 · 4 answers · asked by Sara 1 in Biology

What would happen?

2006-11-25 17:07:43 · 7 answers · asked by Anonymous in Astronomy & Space

2006-11-25 17:07:32 · 6 answers · asked by Idunnowhoim 2 in Physics

ligand when descending the group in the periodic table from 3d series to 4d and the charge inceases on the metal cation

2006-11-25 17:06:18 · 5 answers · asked by mask 1 in Chemistry

Is it possible to find coprime natural "a" & "b" in the equation
a^(2) + b^(2) = c^(2)
When "c" (a natural even number) is given?

2006-11-25 17:05:47 · 5 answers · asked by rajesh bhowmick 2 in Mathematics

Ethiodized oil
- Iopanoic acid

2006-11-25 17:05:06 · 1 answers · asked by Anonymous in Chemistry

need to settle bet with loving wife can evaporation occur in a non oxygen atmosphere

2006-11-25 17:04:36 · 7 answers · asked by Anonymous in Chemistry

2006-11-25 17:02:25 · 10 answers · asked by dramaqueen4evur 1 in Physics

... believe that UFO's should be round (if you believe in them)?

2006-11-25 17:01:58 · 5 answers · asked by 【ツ】ρεαcε! 5 in Astronomy & Space

2006-11-25 17:01:42 · 7 answers · asked by toni m 1 in Other - Science

2006-11-25 16:59:00 · 23 answers · asked by Anonymous in Physics

2006-11-25 16:58:59 · 9 answers · asked by chantal 2 in Earth Sciences & Geology

Recently i read a bood written by a Japanese writer, about blood types. It tells everything about different people with A, B, O & AB, how they are different in characters and what are the relationships bwtween different blood types.
What are your opinions and true experiences? If u are an O, how do find a person with A? (ME & MY BF :p)

2006-11-25 16:54:11 · 4 answers · asked by a V a 4 in Biology

2006-11-25 16:52:34 · 9 answers · asked by tilkinsi 1 in Biology

2006-11-25 16:51:51 · 6 answers · asked by Multiplexman 1 in Engineering

simple words please

2006-11-25 16:49:14 · 2 answers · asked by 123456789 1 in Physics

2006-11-25 16:48:01 · 7 answers · asked by summersguy2003 1 in Medicine

Are they in the dog damily or cat family?

2006-11-25 16:47:57 · 5 answers · asked by chloerochelle102887 1 in Zoology

like for a couple of hours and stuff? And why dom we blink?

2006-11-25 16:43:51 · 2 answers · asked by toni m 1 in Other - Science

2006-11-25 16:43:25 · 8 answers · asked by summervillechick06 1 in Zoology