Chemistry - January 2007

2007-01-30 14:11:58 · 2 answers · asked by Marsi Lui 1

2007-01-30 14:06:47 · 8 answers · asked by Nicole S 1

Okay I am having trouble figuring this out. What is the Ion for the atoms of S, Be, I, Rb,O,Sr, and F. Also what is the Noble-gas configuration of the Ions. So I need to know what is the Ion of those atoms and the Noble-gas configuration of the Ions for Each. Thankyou and take care.

2007-01-30 14:02:46 · 1 answers · asked by Verlander16 2

HOw do I do this?????? HELP!!!!

2007-01-30 13:54:41 · 3 answers · asked by xstraight_edge_emo_kidx 3

average : 13.69mL
calculate total moles of Mg2+ AND CA2+ in 10mL hard water

option 1: 13.65/1000=0.001365L x 0.01 M EDTA= 1.365x10^-5
or
option 2: the same as above but include my calcium moles
and multiple it by my Ca2+ moles?

2007-01-30 13:51:33 · 4 answers · asked by Anonymous

2007-01-30 13:45:18 · 1 answers · asked by field m 1

2007-01-30 13:08:21 · 4 answers · asked by brandel 1

ok well i have to make a ad for a element for science..and my element is potassium..so i need help with idease i could do for it...they have to be interesting so it makes a person interested in you elemetn!!!!!!!!!!

2007-01-30 13:04:24 · 5 answers · asked by Anonymous

2007-01-30 13:04:14 · 1 answers · asked by Mets 1

2007-01-30 13:03:29 · 3 answers · asked by Mets 1

An oxide of nitrogen is 25.9% N by mass, has a molar mass of 108 g/mol, and contains no nitrogen-nitrogen or oxygen-oxygen bonds. Draw the Lewis structure and use it to determine each of the following:

name of the molecule
wrong check mark

total number of valence electrons


number of lone pairs of valence electrons


total number of NO bonds


formal charge on N


formal charge on the most central O


O-N-O bond angle (ideal value)
°

N-O-N bond angle (ideal value)

2007-01-30 13:01:13 · 3 answers · asked by Anonymous

what is the forumla for hydrocloric acid? thanks.

2007-01-30 12:59:37 · 1 answers · asked by wazzup 1

Aluminum sulfate is poured into sodium hydroxide solution.
The balanced chemical equation is
Al2(SO4)3+6NaOH → 2Al(OH)3 +3Na2SO4.

If 35.0 mL of 0.400 M (moles) sodium hydroxide is used, how many moles of aluminum hydroxide can be produced? Explain how the aluminum hydroxide could be isolated after the reaction.
If only 0.00442 moles of aluminum hydroxide were isolated, what would the percent yield be?

2007-01-30 12:44:07 · 3 answers · asked by San Fran Kid 2

---------------------------------------------------------------------------

Given the following data:


C2H2 + 2.5O2 → 2CO2 + H2O DH = −1300 kJ


C + O2 → CO2 DH = −394 kJ


H2 + 0.5O2 → H2O DH = −286 kJ




Calculate DH for the reaction


2C + H2 → C2H2



Please answer and explain thank you!

2007-01-30 12:42:11 · 1 answers · asked by geebgeebgeeb 1

2007-01-30 12:33:45 · 7 answers · asked by jkdtieuytihjkluotr 1

"K2(CO3)+2HCl=2KCl+CO2+H2O"
Is this balanced equation of a chemical reaction between potassium carbonate and hydrochliric acid is right??

2007-01-30 12:32:46 · 2 answers · asked by Anonymous

When you're balancing an equation, how do you know whether or not to add a plus sign or what to do? For example, when you balance say
5O(2)+C(3)H(8) (Parantheses mean subscript)
you get 3CO(2)+4H20

My question is how did it end up to being PLUS 4H20?
Any explanation will be greatly appreciated.

Chemistry is so confusing, if anyone has simpler steps or shortcuts to arriving to an answer, please let me know. Thank you.

2007-01-30 12:31:51 · 6 answers · asked by Lahmsdagr8est! 2

hurryyy

2007-01-30 12:31:08 · 6 answers · asked by DMcCormack 1

2007-01-30 12:10:15 · 5 answers · asked by Pinkie 1

2007-01-30 11:44:54 · 3 answers · asked by I ♥ me 4

Which container has the greater number of atoms if there are two containers with an equal number of moles of helium and hydrogen gases?

Also, what is the ratio of the average kinetic energies of hydrogen and helium at the same temperature?

2007-01-30 11:40:27 · 5 answers · asked by Anonymous

I am doing a simple lab (making soap) and one of the post-lab questions is to calculate the ratio of NaOH to triglycerides. I know the olive oil I used is a triglyceride, but I don't know if the Crisco I used is.

2007-01-30 11:19:29 · 2 answers · asked by Anonymous

The other day somebody played a prank on me in my dorm by smearing a banana all over my doorknob. When I cleaned it off, the doorknob had become all clean and shiny. Is there like, some kind of chemical reaction going on that made this happen?

2007-01-30 11:03:15 · 3 answers · asked by paul n 1

2007-01-30 11:01:16 · 6 answers · asked by Schmitty 1

I also need the same question answered for an apple, baking powder, and brass. =]

2007-01-30 10:54:11 · 3 answers · asked by Schmitty 1

2007-01-30 10:47:17 · 2 answers · asked by roger s 1

Can you please use chemistry terms in explaining this problem, please.

2007-01-30 10:43:23 · 2 answers · asked by Anonymous

2007-01-30 10:34:43 · 4 answers · asked by Anonymous

"Choose colors of light produced for three of your samples and find an approximate wavelength that corresponds to that color. Now find the frequency and energy of each color."
--
The colors are yellow, blue, and green; how do I do this? (I remember her telling us, but I forget and dont have my book with me)

Thanks Alot

2007-01-30 10:30:18 · 1 answers · asked by Anonymous

2007-01-30 10:16:28 · 9 answers · asked by arggg 2