Science & Mathematics - 13 February 2007

Please answer either True or False to the following questions... I forgot my Chem book at school and this stuff is due tomorrow.

TRUE or FALSE

1. Two atomic nuclei join together during nuclear fission.

2. gas molecules are ionized by a radioactive substance in a bubble chamber.

3. Iodine-131 can be used to study the function of the thyroid gland.

4. Radioisotopes are used to kill bacteria.

5. A skeleton of an ancient ish is found to contain one eighth the amount of carbon-14 thaht it contained when it was alive. Assuming that the half-life carbon is 5,730 years, the skeleton would be 11,450 years old.

6. Electrons in the outermost energy level are called oxidation electrons.

7. Covalent bonds form crystals.

8. The tendency of an atom to attract electrons is called electron affinity.

8. The combining capacity of an atom is described by its crystal lattice.

9. Malleable solids are substances whose molecules are very large.

10. A charged atom is called a molecule.

2007-02-13 03:35:39 · 3 answers · asked by Mike 2 in Chemistry

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Is it possible that mars could of been very similar to our own planet many years ago?

2007-02-13 03:35:01 · 10 answers · asked by tunachunks199 1 in Astronomy & Space

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what is the answer this equation?

24x-12x=48

2007-02-13 03:34:30 · 4 answers · asked by gloriousnina 2 in Mathematics

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Can you show me how to solve this problem??

In baseball a player's batting avg. is the ratio of hits to the number of times he or she batted.Thus if the palyer has an avg. of.300, it means he or she got 300 hits in 1000 at bats. In order to have an avg. of .300,how many hits would the batter have to get in 400 times at bat?

2007-02-13 03:33:03 · 3 answers · asked by gloriousnina 2 in Mathematics

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final value of an annuity?

Problem ...final value of an annuity?
You get 8 monthly payments of $650 starring one month from now, at 10% interest rate compounded monthly.

using : A=R((1+i)^n-1 / i

2007-02-13 03:32:50 · 2 answers · asked by mathelp 2 in Mathematics

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what is silicon used for?

2007-02-13 03:31:28 · 18 answers · asked by stephanie t 1 in Chemistry

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Why does it help a hedgehog when they are hibernating if thier temp drops?

This is the full question:
During hibernation the hedgehog's body temperature falls. What is the advantage of this?

2007-02-13 03:31:20 · 4 answers · asked by ♥Killing Loneliness♥ 3 in Other - Science

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what is a easy bridge to build with carboard and wood?

what is a easy bridge to build with wood and cardboard?

2007-02-13 03:29:53 · 1 answers · asked by Anonymous in Engineering

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What is PSI?

All i know about PSI is that it has something to do with air pressure and that the internal prressure of a normal tyre is 32 to 34 PSI. But what exactly is PSI? Can anybody explain..?

2007-02-13 03:28:50 · 3 answers · asked by Anonymous in Engineering

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What does divisible mean?

In math.

2007-02-13 03:27:36 · 14 answers · asked by Anonymous in Mathematics

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why is the sky blue?

2007-02-13 03:27:08 · 13 answers · asked by Anonymous in Earth Sciences & Geology

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What is the process called when birds fly south for the winter?

2007-02-13 03:25:24 · 17 answers · asked by ♥Killing Loneliness♥ 3 in Other - Science

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Can you help me with an excel problem?

I've got the following data

---------A---B---C------D
1 JOE 23 24 18
2 KIM 56
3 BOB 19 40
4 LIZ 79 41 42
5 AMY 88 32

I want to do something so that I get the following from the same data:

----------A---B---C------D
1 JOE 23
2 JOE 24
3 JOE 18
4 KIM 56
5 BOB 19
6 BOB 40
7 LIZ 79
8 LIZ 41
9 LIZ 42
10 AMY 88
11 AMY 32

So basically moving everything in columns C and D into column B whilst keeping it's related column A data.

Does anyone have any idea how? I'm stumped!

2007-02-13 03:24:02 · 5 answers · asked by joey_mook 1 in Mathematics

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How do I CALCULATE water EVAPORATION from RELATIVE HUMIDITY ?

I'd like to calculate water loss at 30%rh, 50%rh, 70%rh & 90%rh from the surface of water at a constant temperature of 30degC.
I can assume a constant breeze at a lower temperature than the water surface.

2007-02-13 03:18:53 · 2 answers · asked by Anonymous in Chemistry

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Where can i find information on the bone cell and good pictures.?

I need good pictures that tell where each part iz. This is for a project

2007-02-13 03:18:30 · 2 answers · asked by attilahnyc 1 in Biology

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What ancient people used the North Star?

As a navigation tool, mainly.

2007-02-13 03:17:15 · 6 answers · asked by Anonymous in Astronomy & Space

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give some examples of action and reaction in daily life? some funny ones?

2007-02-13 03:16:44 · 4 answers · asked by Anonymous in Chemistry

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Polynominals ???

I need to find the missing polynominal. Can someone explain how to do that. I know the answer is 7n... but how to get it?

(3x^2+2xy-1)+(x^2+xy+5)+(?)=5x^2-3xy+3

2007-02-13 03:16:42 · 3 answers · asked by Anonymous in Mathematics

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