Chemistry - January 2007

I heard from someone that a glass bottle or glass in general is still considered a liquid but is moving so slowly that it feels solid, is this true at all?

2007-01-27 06:51:03 · 6 answers · asked by Anonymous

A 500 mg of arabinose is rehydrated with 4 ml of water.
Then all of the arabinose is added to 150 ml of another media.
I thought the answer was 500 mg/(150 ml + 4ml)=3.25 mg/ml
My teacher says the answer is 125mg/150ml= .833 mg/m which can only be true if 1 ml of the original solution was to the added to 149 ml of media?

2007-01-27 06:33:25 · 2 answers · asked by Anonymous

2007-01-27 06:12:44 · 6 answers · asked by oh 1

What is it? I never knew what it really was.

2007-01-27 05:55:11 · 3 answers · asked by Anonymous

and if its possible some webs 2

2007-01-27 05:46:13 · 3 answers · asked by Anonymous

I have a lab to do. In order to complete the lab I need to know this. In my expt. I had to melt wax and then let it form a ball on 3 different wires of 3 different thicknesses to find out which conducts heat faster. Let the wax dry, then, put 1 end of the wire over a fire. During this, I observed all the wires. They all charred after a layer of some copper type coating came off. I was able to wipe it off with my fingures, but i don`t know why that happened.

2007-01-27 05:36:56 · 4 answers · asked by stusa 1

compound formed from Pb^4+ and C2H3O^2- is?
i know the anwser is Pb(C2H3O2)2 ... can some one explain step by step what to do to get from Pb^4+ and C2H3O^2- to Pb(C2H3O2)2
..... it would be alot of help exam very soon

2007-01-27 05:35:06 · 6 answers · asked by Anonymous

please answer it

2007-01-27 05:22:45 · 9 answers · asked by Anonymous

2007-01-27 05:09:55 · 3 answers · asked by kathrine 1

What are the reasons for the acidic nature of acetylsalicylic acid (aspirin)??

2007-01-27 05:01:42 · 3 answers · asked by Pooh 4

the experiment was adding 1M NH4Cl to a 0.1M NH4OH soln which had phenolphthalein indicator in it. The solution went from pink to colorless, indicating that [NH4+] went up, [OH-] decreased.

then, we added some concentrated 6M NH4OH, which ions' concentration are added to the equilibirum? both [Nh4+] and [OH-]? and how does the change in [OH-] affect [H3O+]?

Thank you!

2007-01-27 04:53:12 · 1 answers · asked by shuttlegirl 2

1. A chemical reaction in which the products can regenerate the original reactants is a
a.forward reaction.
b.reaction rate.
c.reversible reaction.

2. Ninette wants to sweeten her iced tea. She looks in the restaurant's sugar dish and sees regular white granulated sugar and a packet of natural sugar. She opens each and sees that the natural sugar has very large crystals, much larger than the granulated sugar. Which sugar would be more likely to dissolve without Ninette having to stir the tea? Explain.

2007-01-27 04:36:06 · 1 answers · asked by nice too meet you. 4

i did these problems, and i want to check with someone to make sure they are right

1. Indicate if the following processes requires heat for the process to occur.
a. C6H12O6 + O2---> CO2 + H2O + Heat
b. Making ice cubes
c. Formation of snow in clouds
d. Evaporation of water
e. A candle flame

3. Under what conditions can the equilibrium point change?

4. Match the terms with their definitions.
enthlapy, activiation, entroy, concentration, spontaneous process

A) a physical or chemical change that occurs with no outside intervention
B) the minimum energy needed to start a chemical reaction
C) quantity specifying the amount of disorder or randomness in a system bearing energy
D) measure of the heat content of a chemical or physical system
E) measure of the relative proportion of two or more quantities in a mixture

6. Equilibrium happens through spontaneous processes without any outside forces acting on the system.
True or False

2007-01-27 04:33:51 · 3 answers · asked by nice too meet you. 4

2007-01-27 04:19:11 · 4 answers · asked by hash 1

2007-01-27 03:52:19 · 9 answers · asked by Anonymous

2007-01-27 03:50:15 · 7 answers · asked by lashypooh1193 1

Is it because the density is the same?
When calculating mass/volume = density.
If two samples come up with the same density does that mean they are made up of the same substance?

2007-01-27 03:42:17 · 5 answers · asked by Anonymous

Ok so the problems are

add coeficients
Fe + HC2H3O2 -> Fe(C2H3O2)3 + H2

supply correct products and balance adding coefficients
Al + Pb(No3)2 ->
Mg + H3P04 ->
K + HOH ->
Cl2 + CaI2 ->

write correct formulas to show reactants and products then balance

sodium + water -> sodium hydroxide + hydrogen

aluminum + copper (II) sulfate -> aluminum sulfate + copper

2007-01-27 03:20:28 · 4 answers · asked by Taylor 1

I would like to know how much NaCl in grams i must use per litre of distilled water.
Thx

2007-01-27 02:22:17 · 2 answers · asked by anwar r 1

2007-01-27 02:13:26 · 3 answers · asked by angel_4_life_88_2002 1

2007-01-27 02:11:14 · 1 answers · asked by angel_4_life_88_2002 1

the method which i have got is using the KOH which is in powder form,but i have in liquid form,so how to make the solution?...thank you so much ...urgent...

2007-01-27 02:03:59 · 4 answers · asked by young_chemist 1

2007-01-27 02:02:41 · 8 answers · asked by Anonymous

Can someone PLEASE help me figure out a recipe for "small" salt crystals? (the ones that take only a few days)

2007-01-27 01:44:11 · 1 answers · asked by .BiteMe 5

2007-01-27 01:33:31 · 9 answers · asked by Razieh S 1

London detectives just reported that one teapot was highly radioactive weeks after Litvenenko's death. The Milennium Mayfair is a five-star hotel. You would think it would have been washed several times since.

2007-01-27 01:33:23 · 5 answers · asked by greydoc6 7

The electrical and magnetic properties of Mn perovskites are critically dependant on the Mn oxidation state.

2007-01-27 01:08:46 · 1 answers · asked by Student 1

2007-01-27 01:08:29 · 8 answers · asked by Louise 2

2007-01-27 00:44:14 · 1 answers · asked by Anonymous

and also can somebady tell me which is the most reactive nonmetal in the periodic table???
I have no idea how to figure this out...

2007-01-27 00:29:25 · 7 answers · asked by okiron 1