Chemistry - October 2007

2007-10-03 12:08:57 · 4 answers · asked by Anonymous

Member since: May 01, 2006
Total points: 171 (Level 1)
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Absolutely
S What chemical reaction does iodine to the starch in foods that give sit its blue-black color??
I know its something about the iodine fitting inside of the amylose molecules but after tht wat happens??Please help me ty

2007-10-03 12:02:02 · 2 answers · asked by Anonymous

homogeneous mixtures and heterogeneous mixtures?
and is sand water mixture an example of heterogeneous mixture and is salt water a homogeneous mixture?

i keep on reading about it, but im still kinda lost....i have a test tomorrow and i need help =(

2007-10-03 11:58:06 · 2 answers · asked by Anonymous

that allow them to be substituted for eachother...
and
what properties make them different from eachother?

2007-10-03 11:54:50 · 1 answers · asked by Tr4ck4Inc@ 2

Mettalic Bonding
Covalent Bonding
Ionic (Electrovalent) Bonding


PLEASE PLEASE HELP!!!!

2007-10-03 11:46:12 · 1 answers · asked by emoteddybear02 2

Ie. more metallic/less magnetic from left to right? I found out that this is examinable in my year 12 exam, but there is no mention of it in my texbook.

Thanks for your help :)

2007-10-03 11:30:57 · 1 answers · asked by Anonymous

im having a test tomorrow and i have no idea

2007-10-03 11:20:20 · 1 answers · asked by Anonymous

They seem the same to me. Thanks for looking!

2007-10-03 11:13:17 · 2 answers · asked by bradyball48 2

so i've heard silver nitrate makes a nice temp tattoo but i've also read it's corrosive to the skin. i'm a little confused...help?

2007-10-03 11:11:14 · 1 answers · asked by Nacho DeGarvo 3

2007-10-03 11:08:59 · 1 answers · asked by Anonymous

the other 2????? sorry, didn't have enough room.

2007-10-03 11:04:58 · 1 answers · asked by Anonymous

i need help!

2007-10-03 10:48:47 · 2 answers · asked by Anonymous

2007-10-03 10:48:35 · 2 answers · asked by superstretchy 1

This is a chemistry question for a student monography

2007-10-03 10:45:38 · 3 answers · asked by TuyoMio.com 3

when 0.424g of finely divided iron is burned, 0.606g reddish brown oxide is obtained. Determine the emperical formula of the oxide. Please help me solve this problem and show work. Thank you.

2007-10-03 10:42:52 · 2 answers · asked by viri4 1

liquid nitrogen it has to be at a certain temperature to be a liquid since it is a gas at room temperature. I saw this jug of it and it was at room temperature but how was it still a liquid. Also where can i buy some, LOL serious question?

2007-10-03 10:42:28 · 3 answers · asked by ? 3

Why can water dissolve salt and not a molecular substance like wax.

2007-10-03 10:32:31 · 1 answers · asked by fred 1

A solution of 100.0 mL of 0.200 M KOH is mixed with a solution of 200.0 mL of 0.150 M NiSO4.

(a) Write the balanced chemical equation for the reaction that occurs. (Type your answer using the format H2O for H2O and (NH4)2CO3 for (NH4)2CO3. Use the lowest possible coefficients.)
___NiSO4(aq) +_____KOH(aq) _____ ___(s) + ___ _____(aq)

(b) What precipitate forms?


(c) What is the limiting reactant?


(d) How many grams of this precipitate form?
g

(e) What is the concentration of each ion that remains in solution?
Ni2+
____ M

K+
______M

SO42-
______ M


this is crazy, how do I do this?

thanks!

2007-10-03 10:14:57 · 1 answers · asked by Jon-O 1

Boiling points of several liquids

benzene 80.2 C
ethyl alcolhol 78.4 C
chloroform 61.3 C
carbon disulfide 46.3 C

Do you think a good seperation of a mixture of ethyl alcohol and benzene could be achieved by distilation?

2007-10-03 10:05:57 · 2 answers · asked by chewycookie246 4

2007-10-03 09:53:35 · 6 answers · asked by Anonymous

of menthol? thymol? and resorcinol?

can someone help me with these three?

2007-10-03 09:48:08 · 4 answers · asked by sweetgirl78228 2

2007-10-03 09:47:09 · 5 answers · asked by Anonymous

2007-10-03 09:40:58 · 3 answers · asked by Jesse R 4

2007-10-03 09:39:58 · 3 answers · asked by Dyamond A 1

Fill in the blanks:

Element- H
Atomic Weight- 1
Mass of Element, g-
Amount, mol- 0.412
No. of atoms-

thanks!!!!!

2007-10-03 09:38:56 · 3 answers · asked by sillylilchalupa 1

2007-10-03 09:34:06 · 3 answers · asked by Anonymous

yea I don't get these kinds of questions
any advice on how to solve them?
thanks

2007-10-03 09:30:18 · 1 answers · asked by Anonymous

1) A 10 mL sample of HCl solution was transferred by pipet to an Erlenmeyer flask and then diluted by adding about 40 mL of distelled water. What is the approximate H3O+ concentration and pH of the solution in the flask before the titration begins? (approx concentration of HCl is 0.5 M)

2) Phenolphthalein indicator was added, and the solution in the flask was titrated with 0.215 M NaOH until the indicator turned pink (pH = 8-9). The exact volume of NaOH required was 22.75 mL. Use the following equation to calculate the concentration of HCl in the original 10 mL sample ==>

Mb x Vb = nMa x Va

Mb = molarity of standadrd base solution
Vb = volume of base added
n = mole ratio
Ma = unknown molarity of acid solution
Va = initial volume of acid solution

3) One student accidentally "overshot" the endpoint and added 23.90 mL of 0.215 M NaOH. Is the calculated concentration of HCl likely to be too high or too low as a result of this error? Why?

please help ASAP! thanks so much!

2007-10-03 09:24:52 · 1 answers · asked by KatieLC91 1

2007-10-03 09:17:29 · 9 answers · asked by YVONNE W 1

I have helum,oxygen,silver,and gold can you find any others?

2007-10-03 08:42:47 · 1 answers · asked by Anonymous