Chemistry - February 2007

I'm in biology and I've been searching it for a while and I cannot find it....any help????

Thanks!

2007-02-06 09:56:38 · 3 answers · asked by Anonymous

What is the number of protons, electrons, and what is the net charge of..
- hydrogen atom
- sodium atom
- chlorine atom
- hydrogen ion
- sodium ion
- chloride ion

2007-02-06 09:55:56 · 4 answers · asked by untilyoucamealong04 3

does anyone know the answer to this Chemistry question?

2007-02-06 09:52:57 · 1 answers · asked by Anonymous

I am in organic chem and when doing a spinach pigment extraction out colours are green, yellow, yellow, green....can anyone tell me what these pigments are?

2007-02-06 09:52:01 · 1 answers · asked by Anonymous

a. large charge and large size
b. large charge and small size
c. small charge and large size
d. small charge and small size
e. zero charge and small size

I'm stumped on this one and any help would be appreciated.

2007-02-06 09:42:15 · 1 answers · asked by Shake and Bake 1

FIRST ONE TO GET IT RIGHT GETS MY 'BEST ANSWER' VOTE!!!


A new element, ontarium (On), has been formed. We know that it is a halogen.

a) How many electrons does it have in its outer orbit?

b) What will be the name of the compound it forms with sodium?

c) What will be the name of the compound it forms with calcium?

d) Predict the formulas of the compounds named in (b) and (c)



REMEMBER FIRST ONE TO GET IT, GETS BEST ANSWER!!!
YOU JUST NEED TO KNOW YOUR CHEMISTRY!!!

2007-02-06 09:41:26 · 2 answers · asked by Anonymous

2007-02-06 09:30:16 · 3 answers · asked by kaye 1

If a saturated solution of Ag2CrO4 has a Ksp = 1.10 x 10-12 and a [CrO42-] = 7.1e-05, what is the value of [Ag+]? Thanks for your help.

2007-02-06 09:26:55 · 1 answers · asked by ash 1

I'm stuck here....

it takes 1440kJ to complete vaporize 10kg of a substance, it occurs at 100 degrees C, and takes 24 minutes. I also have a graph that shows the various changing states. How do I calculate both the specific heat and heat of vapoization?? there may be other info from the graph that could be used..but i think this is the most important stuff...thanks!

2007-02-06 09:26:52 · 3 answers · asked by sandcastlesinair 1

i would like free books or dvds for any kind of science. but any free stuff sites will be good.

2007-02-06 09:24:58 · 1 answers · asked by Jackie G 1

2007-02-06 09:21:02 · 3 answers · asked by el_kileni 1

Consider the reaction with the rate law, Rate = k[BrO3-][Br-][H+]^2

By what factor does the rate change if the concentration of BrO3- is quadrupled and that of Br- is doubled?

Any ideas?

The correct answer is 8.

2007-02-06 09:09:53 · 1 answers · asked by other_user 2

2007-02-06 09:03:28 · 3 answers · asked by Leanne 3

2007-02-06 08:46:48 · 4 answers · asked by Anonymous

2007-02-06 08:34:04 · 4 answers · asked by Mike 1

2007-02-06 08:28:00 · 5 answers · asked by Charles 2

A log is known to be either oak or pine. It displaces 2.7 gallons of water and weighs 19.8 pounds. Is the log oak or pine? Density of oak=0.9 g/cm^3. Density of pine =0.4 g/cm^3.

2007-02-06 08:26:04 · 3 answers · asked by tweetys_01 3

2007-02-06 08:15:20 · 5 answers · asked by dan 1

A sample of seawater contains 6.2777 g of sodium chloride per liter of solution. How many mg of sodium chloride would be contained in 15 ml of this solution?

2007-02-06 08:08:11 · 10 answers · asked by Ashboo 2

I need to know how to draw it and label sigma and pi bonds, as well as hybridizations.

2007-02-06 08:05:46 · 2 answers · asked by samaireh d 1

Z A # protons #electrons #neutrons charge

Mg^2+ #neutrons=13

Ti^4+ A=48

S^2- #neutrons=16

Pb^2+ #neutrons=125

2007-02-06 08:05:18 · 2 answers · asked by tweetys_01 3

2007-02-06 07:55:11 · 2 answers · asked by Mike 1

What is the overall chemical equation if you add [NaOH] with [C6H5NH3+] assuming that the latter & [C6H5NH2] are already present in the solution?

I'm getting something like:

[C6H5NH3+] + [OH-} <==> [C6H5NH2] + [H3O+]

but the H's won't add up...so I'm figuring what's wrong with this equation. Can someone please help and clarify this for me?

2007-02-06 07:51:18 · 2 answers · asked by Student_007 1

How many Pi and Sigma bonds are there in Naphthalene? Is the number the same for all three resonance structures?

2007-02-06 07:46:07 · 2 answers · asked by mrkittypong 5

thanks for any help.

2007-02-06 07:44:54 · 3 answers · asked by 360 2

i need help with all of the steps

2007-02-06 07:34:42 · 1 answers · asked by ruger5al 2

of C12H22O11 in amu.

What I did was multiply the number of each element x it's atomic mass: 6(12.0 amu) + 22(1.0 amu) + 11(16.0 amu) = 342.0 amu but when I put this answer in, the answer key tells me it's wrong! What am I doing wrong??

2007-02-06 07:34:32 · 3 answers · asked by DJ 1

I am looking for somebackground info on this area and any good related websites. i would like to learn more on this area of proteins, espeically the monomer and polymer structures. Also the relationship between the structure and functions
thank you

2007-02-06 07:27:01 · 4 answers · asked by Sars 1

we know that the inner shell can only hold 2 electrons and an outer or secondry shell can only hold up to eight electrons- does this mean that an atom of thorium has 11 outer shells?
and please before the dissinterested souls come back with silly quips - I am trying to learn!

2007-02-06 07:08:22 · 8 answers · asked by Anonymous

2007-02-06 07:06:02 · 2 answers · asked by Yup 1