Science & Mathematics - 17 October 2007

between group 14,15, and 16 there is a patern between the boiling points with the boiling point being higher for the higher group- but group 17 dosn't fit the pattern it has lower boiling point then group 15 - why? As well how do you explain the anomalies such as water?

2007-10-17 08:58:16 · 1 answers · asked by stevenback0 2 in Chemistry

Which of the following is the least reactive?

calcium

magnesium

radium

strontium

barium

2007-10-17 08:57:36 · 3 answers · asked by Anonymous in Chemistry

2007-10-17 08:54:48 · 1 answers · asked by Terri L 2 in Biology

2007-10-17 08:54:10 · 1 answers · asked by Terri L 2 in Biology

2007-10-17 08:52:35 · 7 answers · asked by Anonymous in Earth Sciences & Geology

2007-10-17 08:49:03 · 6 answers · asked by ESTHYMIA G 1 in Geography

2007-10-17 08:47:23 · 5 answers · asked by Sinead G 3 in Zoology

2007-10-17 08:47:19 · 19 answers · asked by Anonymous in Paranormal Phenomena

Give me the steps of each one:

6 times x times (-15)

(57 + x) + 36

37 + [ x + (-52) + 18]

2007-10-17 08:45:26 · 13 answers · asked by carmen111 2 in Mathematics

2007-10-17 08:39:46 · 3 answers · asked by Manpreet S 1 in Botany

Writing in Math: How does knowing 30+7=37 help you find 37+23?

2007-10-17 08:38:00 · 42 answers · asked by l 2 in Mathematics

Thus it could run claw bite and fly?

2007-10-17 08:36:34 · 6 answers · asked by Speedy 1 in Zoology

2007-10-17 08:34:06 · 6 answers · asked by BabyBlue 1 in Astronomy & Space

two forces F1 and F2 are acting horizontally on a spool at radius 2r and r respectively show that inorder to have zero friction force at the bottom the ratio F1/F2= ( I+2mr^2)/(4mr^2-I)
where I is the moment of inertia of spool and m is the mass.

2007-10-17 08:32:23 · 1 answers · asked by sameerteacher01 1 in Physics

If you increase CO2, what will happen to the photosynthetic rate if a plant is in the C4 cycle?

2007-10-17 08:31:20 · 1 answers · asked by me 3 in Biology

ex:
17+2n=21+2n


i'm so cofused!!!!! please help? please explain everything.
i know it's like this because my teacher went over it.
17+2n=21+2n
-2n -2n

17=21....... but how do you know which one to use?? lke in this case you used -2n to subtract each side and whatever. but why couldn't u use the 21 or 17???? ughhh plz help!!!

also with this one
5+2(k+4)=5(k-3)

which one do u use to like subtract or add by??? plz help me?

2007-10-17 08:30:01 · 9 answers · asked by Soprano 2 in Mathematics

Plants are important because they breath out oxygen, which we breath in. We are also important to them! We breath out carbon dioxide, that is like their oxygen.

2007-10-17 08:29:50 · 9 answers · asked by danica ^^ 4 in Botany

What can be done about these problems?
Thanks in advance.

2007-10-17 08:27:49 · 2 answers · asked by Anonymous in Geography

Do the charges of an atom effection ionization energy and electron affinity? If they do, how so?

For instance, Cl-, Cl+ or CL. Which would have the great ionization energy or electron affinity?

Thanks

2007-10-17 08:27:26 · 1 answers · asked by thunderbomb90 3 in Chemistry

Find the coordinates of the vertex.

f(x) = 4x2 + 48x + 8

f(x) = x2 + 8x + 12


f(x) = x2 + 14x + 45

2007-10-17 08:26:10 · 4 answers · asked by Jess 1 in Mathematics

So what should I write about this? or well, how am i suppose to write this? Can cells even mate?!...Okay so maybe they can but why would that work? Please help!

2007-10-17 08:25:52 · 2 answers · asked by alexelric14 2 in Biology

2007-10-17 08:25:02 · 6 answers · asked by Anonymous in Engineering

Please explain...I'm writing the PSAT in an hour.

2007-10-17 08:24:52 · 5 answers · asked by Anonymous in Mathematics

Ok, need to design a chemical experiment. I'm given certain amount of water at an unknown temperature and a thermometer that only goes to 40 degrees C. I have a chem lab at my disposal (grad cylinders, 0.001g wieghts, ect) I must find the tempurature of the water. I can use additional water, ice, ect. I need a straighforward way to do this, and record my data. Can I do it using Moles? what equations would I need? is there a way to do it otherwise? Thanks!

2007-10-17 08:20:25 · 3 answers · asked by colorsonfriday 2 in Chemistry

How do you convert the hexadecimal number 16.3852 to decimal form?? I know the answer is 22.22 but how do you do it? Please show me how to do this manually. THANKS!

2007-10-17 08:15:39 · 5 answers · asked by dkmu 1 in Mathematics

In other words, is space and time being created on the brim of the universe?

2007-10-17 08:12:20 · 7 answers · asked by Jansen J 4 in Astronomy & Space

Ok so I need to find the I NEED TO MAKE 45% INTO A DECIMAL AND INTO A FRACTION.... i WILL CHOOSE A BEST ANSER BUT YOU HAVE TO SHOW YOUR WORK...!

I ALSO NEED TO MAKE 3/5 INTO A DECIMAL AND INTO A PERCENT ALSO SHOW WORK!!

aND LAST I NEED TO FIND THE PERCENT AND FRACTION OF THE NUMBER 0.15

THANKS!

2007-10-17 08:09:12 · 4 answers · asked by Party_Hottie12 3 in Mathematics

2007-10-17 08:08:09 · 1 answers · asked by cutevegetarian 2 in Biology

Please explain in steps..I am totally lost

A company that manufactures pencil sharpeners has collected the price-demand data. A linear regression model for price-demand data is p = d(x) = 3 − 0.0002x where x is the number of pencil sharpeners (in thousands) that the company can sell at a price of $p. Find the price that maximizes the company's revenue from the sale of pencil sharpeners.

2007-10-17 08:08:04 · 3 answers · asked by Anonymous in Mathematics

Which is the atomic number for the element Boron?

4

56

5

10.81

2007-10-17 08:06:07 · 11 answers · asked by Anonymous in Chemistry