Science & Mathematics - 22 December 2006

plz respond

2006-12-22 04:44:24 · 5 answers · asked by Anna 1 in Chemistry

I learned in class recently that the Earth is 4.6 billion years old, but our oldest rocks are 3.9 billion.

First, do we know how old the Earth is by dating asteroids? Since they were formed at the same time as the planet that would make sense.

Second, does that mean it took .7 billion years for the Earth to cool down? What made it cool?

Cite sources please.

2006-12-22 04:43:12 · 5 answers · asked by Anonymous in Astronomy & Space

Write a balanced chemical equation for the neutralization reaction of acetic acid and ammonia. What is the salt that is created?

2006-12-22 04:42:29 · 3 answers · asked by luc_allmon 2 in Chemistry

I've been to Lake Michigan, and Lake Erie in the summertime, and the sand is so hot, you either wear flip flops or shoes. To go barefoot is only possible next to the water where the waves keep getting it wet.

2006-12-22 04:42:28 · 2 answers · asked by Michigan Southpaw 1 in Other - Science

2006-12-22 04:40:53 · 4 answers · asked by cajohnson667 3 in Medicine

2006-12-22 04:39:44 · 8 answers · asked by sachin s 1 in Chemistry

2006-12-22 04:37:14 · 16 answers · asked by monie c 2 in Astronomy & Space

2006-12-22 04:35:44 · 2 answers · asked by cajohnson667 3 in Medicine

Ok when we take tests in AP we have a curve. like if we get a 23 on the test shell add 50 points to it. but the higer grade you get, the lower the curve. how does it work if i had a 75 on a test?

2006-12-22 04:35:35 · 2 answers · asked by Scooter 1 in Chemistry

please tell me

2006-12-22 04:34:42 · 12 answers · asked by my_emo_romance 2 in Earth Sciences & Geology

2006-12-22 04:34:08 · 5 answers · asked by cajohnson667 3 in Medicine

over what distance dose the level start to give error's IE on a building site

2006-12-22 04:33:15 · 4 answers · asked by Harold T 1 in Chemistry

2006-12-22 04:33:09 · 12 answers · asked by Chichi 1 in Geography

2006-12-22 04:33:08 · 4 answers · asked by cajohnson667 3 in Biology

Do I need a Garth Brooks CD?

2006-12-22 04:32:10 · 2 answers · asked by Anonymous in Engineering

How big, vertically, does a mirror have to be to see your whole reflection?

It has to be half of your height, no matter how far or close you are.

2006-12-22 04:31:06 · 5 answers · asked by Anonymous in Physics

The number is about 6.022 x 10^23 but how was is determined?

2006-12-22 04:28:40 · 3 answers · asked by Spudda 1 in Chemistry

2006-12-22 04:21:29 · 5 answers · asked by Heretostay 1 in Engineering

energy released when burned 1 mol of benzene is burned

2006-12-22 04:19:43 · 3 answers · asked by Matthew H 1 in Chemistry

2006-12-22 04:17:53 · 15 answers · asked by Pete C 1 in Mathematics

2.Which is used to reach a conclusion in a formal proof?

A.experimentation

B.syllogisms

C.deductive reasoning

D.measurement

2006-12-22 04:17:24 · 4 answers · asked by Skylar 1 in Mathematics

Please help:

Which of the following solutions has the lowest freezing point?

A)0.20 m C6H12O6, glucose
B)0.20 m NH4BR
C)0.20 m ZnSo4
D)0.20 m KMn04
E)0.20 m MgCl2

2006-12-22 04:16:10 · 5 answers · asked by Scooter 1 in Chemistry

All about industrial mechanical maintenance engineering. This trade is significantly applicable to millwrights activities. Any country is ok provided you find me what I am interested to pursue my Bachelor's degree in the field of Millwright technology.

2006-12-22 04:15:06 · 2 answers · asked by Millwright 1 in Engineering

Please Help:

Which if the following is lower for a 1.0-molar aqueous solution of any solute than it is for pure water?

A) pH
B)Vapor pressure
C)Freezing point
D)Eliectrical conductivity
E)Absorption of visible light

2006-12-22 04:12:57 · 3 answers · asked by Scooter 1 in Chemistry

Why isn't a triangle called a trigon? Why isn't a square called a quadrangle or a quadragon?

2006-12-22 04:11:04 · 13 answers · asked by Anonymous in Mathematics

2006-12-22 04:09:02 · 13 answers · asked by mansooresbi 1 in Engineering

2006-12-22 04:07:35 · 7 answers · asked by ben c 2 in Astronomy & Space

I am building a small EV and have up to 26 amps @ 38.4 vdc (theorectically). I was trying to find an enexpensive way to separate the multiple 9.6vdc NIMH battery packs to facilitate charging.

2006-12-22 04:06:22 · 7 answers · asked by bronsonj 1 in Engineering

2006-12-22 04:05:47 · 15 answers · asked by Litmus180 3 in Mathematics

Please Help:

The boiling points of elements helium, neon, argon, krypton, and xenon increase in that order. WHich of the following staements account for this?
A) The London dispersion forces increase
B)The hydrogen bonding increases
C)The diopole-diople forces increase
D) The chemical reactivityincreases
E) The number of nearest neighbors increases.

2006-12-22 04:04:50 · 8 answers · asked by Scooter 1 in Chemistry