Science & Mathematics - 14 December 2007

A radium watch dial contained 20 micrograms of radium-226 in the year 2000. The watch was discovered by archeologists in the future and found to contain only 5 micrograms of radium-226. In about what future year was the watch discovered?

2007-12-14 05:29:44 · 2 answers · asked by Anonymous in Chemistry

what is ture about the molar mass of chlorine gas?


A. the molar mass is 35.5 g
B. the molar mass is 71.0 g
C. the molar mass is equal to the mass of one mole of chlorine atoms
D. none of the above

2007-12-14 05:29:26 · 3 answers · asked by Anonymous in Chemistry

1) If the average velocity of Helium (molecular weight=4g/mole) is 0.707miles/second at room temperature, what will be the average velocity of oxygen(molecular weight 32g/mole) at the same temperature?

2)A gas of unknown composition diffuses at the rate of 10ml/sec in a diffusion apparatus in CH4 (molecular weight=16g/mole) gas diffuses at the rate of 30ml/sec.Calculate the molecular weight of the unknown gas.

please help me answer as much as possible. I have a final on monday =( thanks in advance!

2007-12-14 05:29:08 · 2 answers · asked by Heart You 3 in Chemistry

I NEED THIS ANSWER FOR HOMEWORK

2007-12-14 05:28:02 · 13 answers · asked by Nena 1 in Other - Science

ok so heres the problem it says segment bc is how much longer then segment ab. so it shows the problem in inches. segment ab is 1 and 1 6th long and bc is at the one and one sitxth line and goes all the way to the four inch line. I cant figure out how much longer bc is then ab! This sounds stupid but i need this answer.

2007-12-14 05:27:18 · 3 answers · asked by Falloutboyfan33 1 in Mathematics

2007-12-14 05:25:05 · 4 answers · asked by JC927 1 in Biology

A. Star formation has been taking place for billions of years.
B. The Universe evolved from a hot, dense state.
C. Colliding galaxies release enormous amounts of radiation.
D. A 3 Kelvin, the early universe was extremely cool.
E. The early universe had more stars.

2007-12-14 05:22:13 · 6 answers · asked by Anonymous in Astronomy & Space

Can you make it with baking soda?

2007-12-14 05:22:07 · 2 answers · asked by Anonymous in Chemistry

2007-12-14 05:21:43 · 5 answers · asked by Anonymous in Biology

2007-12-14 05:20:54 · 2 answers · asked by Anonymous in Biology

A. It takes time to analyze the data.
B. The universe is very cold.
C. It takes time for light to travel.
D. Our telescopes are not yet large enough.
E. The light has been red-shifted.

2007-12-14 05:20:31 · 9 answers · asked by Anonymous in Astronomy & Space

2007-12-14 05:20:05 · 4 answers · asked by Anonymous in Biology

1.2x + 4y= 16
3x- y =3
x=y=

2. Solve the x
x-2x-3=3

3.

2007-12-14 05:19:47 · 8 answers · asked by Anonymous in Mathematics

2007-12-14 05:19:09 · 16 answers · asked by Satchelle J 1 in Physics

There are many theories in the field of physics that are unexplained. One such theory is the multiverse theory, which may be proven sometime next year. If there are truly 11 dimensions and we may live in one of countless universes, then could there be an unexplained supernatural dimension? For example, if there were a supernatural dimension, could this explain God? I am not referring to any specific god, but just a generalization.

2007-12-14 05:17:59 · 10 answers · asked by Anonymous in Physics

In a few years, once space tourism becomes more accessible to the masses that people can purchase orbital flights, would a flat earther even dare go on such a flight? If so, seeing the round Earth for themselves, would they finally STFU?????

They should call it the "head in the sand society"

2007-12-14 05:16:12 · 7 answers · asked by ZeroByte 5 in Astronomy & Space

His wife used to help with all the math,besides that he never really
did anything great after his divorce.

2007-12-14 05:13:44 · 18 answers · asked by Anonymous in Physics

2007-12-14 05:13:34 · 6 answers · asked by Anonymous in Physics

2007-12-14 05:08:24 · 9 answers · asked by Anonymous in Biology

2007-12-14 05:06:33 · 7 answers · asked by Anonymous in Biology

what are Four sexually dimorphic characteristics in trout?

2007-12-14 05:03:24 · 2 answers · asked by Gee 2 in Zoology

2007-12-14 05:01:21 · 4 answers · asked by udani l 1 in Agriculture

I'm doing a report on the the asian Longhorned Beetles. I need as much information as I need ASAP. The most information will win the best answer.

2007-12-14 04:58:33 · 2 answers · asked by adelooze 1 in Zoology

2007-12-14 04:55:52 · 8 answers · asked by doug 1 in Physics

A painter has 7 paintings he considers his best. He is asked to submit one painting to each of three painting contests to be held in New York, Los Angeles, and Kansas City. In how many ways can he choose to submit four of his paintings

2007-12-14 04:54:06 · 5 answers · asked by jewel7962002 1 in Mathematics

2007-12-14 04:51:45 · 10 answers · asked by FRANsuFU 3 in Weather

2007-12-14 04:48:54 · 2 answers · asked by Paul V 1 in Earth Sciences & Geology

book called: The Origin Of Species

2007-12-14 04:46:27 · 6 answers · asked by Amore vole fe 6 in Earth Sciences & Geology

2007-12-14 04:44:53 · 5 answers · asked by Anonymous in Mathematics

i am kinda confused.. i knw tht enzymes are affected by the level of pH. a pH level too low or too high will denature it. but in pepsin's case, it is adapted to work in low pH levels.. in the acidic conditions of the stomach. but tht is wht my Cambridge textbook says.. wht i dont get is, tht if the conditions of the stomach are acidic so how is the pH level they r adapted in working with low?? isnt it supposed to be high cuz of the acidic conditions? is it tht the more low the pH level the more acidic the pH level is?

Thxx. pls help!

2007-12-14 04:40:21 · 9 answers · asked by saifali_1993 1 in Biology