Chemistry - December 2006

2006-12-01 21:55:33 · 1 answers · asked by pete 2

2006-12-01 21:52:50 · 2 answers · asked by kim c 1

2006-12-01 21:51:44 · 3 answers · asked by WT 2

2006-12-01 21:48:10 · 1 answers · asked by WT 2

2006-12-01 21:47:21 · 5 answers · asked by WT 2

some metal oxides were heated with non-metals , explain each of the following results
lead oxide +carbon=lead oxide+carbondioxide
lead oxide+hydrogen=no reaction
carbon oxide +hydrogen=copper+hydro oxide(water)

2006-12-01 21:28:43 · 2 answers · asked by kim c 1

I mean Isoelectric point of casein is at pH4.6, but why?

2006-12-01 21:14:04 · 1 answers · asked by lavene 2

HCl provided is 2M,
limewater contains 1g dm-3 CaOH

2006-12-01 19:53:19 · 2 answers · asked by cinnamonstar123 2

Calculate the pH after 0.029 mol HCl is added to 1.00 L of each of the four solutions.
(a) 0.100 M propanoic acid (HC3H5O2, Ka= 1.3 10-5)

2006-12-01 19:22:09 · 1 answers · asked by tanny 1

2006-12-01 18:57:05 · 1 answers · asked by andric 1

is it a mix or is it something for a cover up,(purity ?)

2006-12-01 18:42:37 · 5 answers · asked by Anonymous

2006-12-01 18:30:26 · 13 answers · asked by teju 1

2006-12-01 18:02:09 · 5 answers · asked by .... 2

in a battery (electrolytic or voltaic cell)
where does the oxidation occur and where does reduction?
do the electrons go from the anode to the cathode?
how do you figure out the voltage of the redox reaction that goes on?

2006-12-01 16:40:44 · 2 answers · asked by Anonymous

2006-12-01 16:21:07 · 1 answers · asked by pal 1

Its not nitric anhydrous right? (sp?)
is it dinitrogen trioxide?

2006-12-01 16:15:40 · 5 answers · asked by Anonymous

calcium oxide + water --> calcium hydroxide

2006-12-01 15:43:16 · 4 answers · asked by am05 1

for solubilty date refere to Lange's Handbook of Chemistry.

2006-12-01 15:37:02 · 2 answers · asked by Parwagon 1

Calculate the percent yield (%) if 15.953 g of AgBr precipitates
when 2.250 L of 0.0600 M AgNO3 (aq) and 2.240 L of 0.0464 M KBr are mixed

2006-12-01 15:08:02 · 1 answers · asked by Anonymous

to make 250. mL of solution.
The student then transfers 27.0 mL of this solution into a 100. mL volumetric flask. Water is then added
up to the 100. mL mark.
What is the final molarity of KOH in the 100. mL flask ?

2006-12-01 15:07:05 · 1 answers · asked by Anonymous

if you can take a ppi drug for heartburn with enzymes? It has marshmallow root extract, slippery elm bark, and plant enzymes (amylase, lipase and cellulase), and gamma-oryzanol (from rice bran) in it.

2006-12-01 15:06:27 · 2 answers · asked by me 2

1.60 L
of a 0.140 M HNO3 solution?

2006-12-01 15:03:25 · 4 answers · asked by Anonymous

Enter a numeric answer only, no units.

2006-12-01 14:51:02 · 2 answers · asked by Anonymous

Enter a numeric answer only, no units.

2006-12-01 14:50:08 · 3 answers · asked by Anonymous

1) All p orbitals have a node
2) In an atom, all orbitals with m1=0 have the same energy
3) There are 5 orbitals in the 4d subshell
4) 2s orbital shields 2p orbital
5) All of the above statements are true.

I'm pretty sure that 1, 3, and 4 are true but I have no idea whether 2 is true or not.

2006-12-01 14:47:29 · 2 answers · asked by Janelle J 1

An air bubble is initially entrapped in the buret for the standardization of the sodium hydroxide solution. However, during the titration the air bubble is passed from the buret. Will the reported molar concentration of the sodium hydroxide be reported as too high, too low, or unchanged as a result? Explain.

2006-12-01 14:06:35 · 4 answers · asked by ZG786 1

Phenolphthalein is a weak organic acid, being colorless in an acidic solution and pink ( because of the color of its conjugate base) in a base solution. The Experimental Procedure suggests the addition of 2 drops of phenolphthalein for the standardization of the sodium hydroxide solution. Explain why the analysis will be less accurate with the addition of a larger amount, e.g., 20 drops, of phenolphthalein.

2006-12-01 14:03:41 · 6 answers · asked by ZG786 1

Pure potassium hydrogen phthalate is used for the standardization of the sodium hydroxide solution. Suppose that the potassium hydrogen phthalate is not completely dry. Will the reported molar concentration of the sodium hydroxide solution be too high, too low, or unaffected because of the moistness of the potassium hydrogen phthalate? Explain.

2006-12-01 13:22:40 · 1 answers · asked by ZG786 1

2006-12-01 13:19:52 · 4 answers · asked by Atavan H{e}len 1

2006-12-01 13:14:05 · 5 answers · asked by Ashley 2