Chemistry - April 2007

I have seen turnkeys that inside them simulate a small ship in the waves of the sea with 2 liquids that don't unite like water and oil (but they aren't the componets). In the bottom is one liquid, in the top the another and in the middle the small ship. You can shake the mix and create much bubbles but in a while there are the 2 liquids with their evident border between them.
Which are the materials of the 2 liquids and the ship? wher can i buy them? they have to be non-toxic products.

2007-04-14 04:39:52 · 2 answers · asked by Anonymous

2007-04-14 00:46:56 · 3 answers · asked by Enigma 1

What happens to 70% Ethyl Rubbing Alcohol (50% tap water mixed with %50 alcohol) when heated up in the microwave? Let's say the microwave is set on high for 1 minute or less.

2007-04-13 22:01:03 · 5 answers · asked by babycattos 4

2007-04-13 20:29:06 · 4 answers · asked by Samie 2

On a climb up Mt. Whitney, the atmospheric pressure is 553 mm Hg.
if i want to find the atm....do i set up my problem like this 553 mm Hg X 1atm / 760 mm Hg or do i multiply 553 by 760 i get confused on which formula to use.

2007-04-13 20:25:13 · 3 answers · asked by orange_crush_05 6

2007-04-13 20:09:03 · 1 answers · asked by W 1

On a climb up Mt. Whitney, the atmospheric pressure is 553 mm Hg.
if i divide 553/760 gives me 0.7276 is that the answer?

2007-04-13 19:53:36 · 1 answers · asked by orange_crush_05 6

The AP Chemistry Exam has one question that requires you to write balanced equations for chemical reactions. In all cases, a reaction occurs. Assume the solutions are aqueous unless otherwise indicated. Represent substances in solutions as ions if the substances are extensively ionized. Omit formulas for any ions or molecules that are unchanged by the reaction. You need not balance the equation.

2007-04-13 19:44:02 · 3 answers · asked by Anonymous

2007-04-13 19:20:30 · 1 answers · asked by anish 2

suppose you are just given a proton NMR graph, how can you identify from the peaks the amt of proton located there in that region. i wonder because i am told the follow the n+1 rule, i.e., if 4 peaks then 3 protons, but i saw one with 5 peaks and they said it had 1 proton.

2007-04-13 19:15:56 · 3 answers · asked by avinashseepaul 1

The AP Chemistry Exam has one question that requires you to write balanced equations for chemical reactions. In all cases, a reaction occurs. Assume the solutions are aqueous unless otherwise indicated. Represent substances in solutions as ions if the substances are extensively ionized. Omit formulas for any ions or molecules that are unchanged by the reaction. You need not balance the equation.

2007-04-13 19:13:24 · 1 answers · asked by Anonymous

The AP Chemistry Exam has one question that requires you to write balanced equations for chemical reactions. In all cases, a reaction occurs. Assume the solutions are aqueous unless otherwise indicated. Represent substances in solutions as ions if the substances are extensively ionized. Omit formulas for any ions or molecules that are unchanged by the reaction. You need not balance the equation.

2007-04-13 19:04:37 · 1 answers · asked by Anonymous

Okay, here's a weird question for you!

I'm memorizing the works of T.S. Eliot and in "Tradition and the Individual Talent" he uses an analogy of a catalyst:

"The analogy was that of the catalyst. When the two gases previously mentioned (oxygen + sulfur dioxide) are mixed in the presence of a filament of platinum, they form sulfurous acid. This combination takes place only if the platinum is present; nevertheless the newly formed acide contains no trace of platinum, and the platinum itself is apparently unaffected; has remained inert, neutral, and unchanged. The mind of the poet is the shred of platinum."

I want to find a visual for this catalyst to help me memorize it, but I don't really have a clue as to what this should look like. (I'm hoping for something more visual than an equation)

Can anyone out there help?

2007-04-13 19:03:56 · 2 answers · asked by T 4

Considering, the equilibrium constant for the reaction below is 0.49, and at equilibrium, [O2] = 0.11 and [N2] = 0.15.

2007-04-13 19:00:40 · 2 answers · asked by W 1

1) Na2CO3 + CO2 + Ca(NO3)2 -> ??
2) Na2CO3 + HCl + Ca(NO3)2 -> ??
3) Mg(NO3)2 + Na2CO3 + HCl -> ??

I can do equations like Na2CO3 + Ca(NO3)2 -> CaCO3 + 2NaNO3 but I cant do the ones like above. Any help and source to understanding is much appreciated!

2007-04-13 18:58:48 · 1 answers · asked by Vath 2

The AP Chemistry Exam has one question that requires you to write balanced equations for chemical reactions. In all cases, a reaction occurs. Assume the solutions are aqueous unless otherwise indicated. Represent substances in solutions as ions if the substances are extensively ionized. Omit formulas for any ions or molecules that are unchanged by the reaction. You need not balance the equation.

2007-04-13 18:58:21 · 2 answers · asked by Anonymous

Considering, the equilibrium constant for the reaction below is 0.49, and at equilibrium, [O2] = 0.11 and [N2] = 0.15.

2007-04-13 18:41:07 · 1 answers · asked by W 1

continued... Glass can be etched by treatment with hydrogen fluoride producing both gaseous and water soluble products. The reaction is sodium silicate plus hydrogen fluoride yields sodium fluoride plus silicon tetrafluoride plus water. First please write and unbalanced equation for the reaction and then balance it

2007-04-13 18:39:40 · 1 answers · asked by Anonymous

1.Indium dinitrite
2.Barium dihydrogen disulfite
3. Manganese (II) dioxide
4. Gold (I) sulfate

2007-04-13 18:31:35 · 1 answers · asked by Anonymous

precipitate of lead (II) sulfide is formed. first write an unbalanced equation for this double displacement reaction and then balance it please

2007-04-13 18:26:07 · 1 answers · asked by Anonymous

plz someone help me on this question !
i would be appreciated ! ^.^

NH4+ is a weak acid whose Ka=5.6x10^-10. Determine the following :

a.The Kb for a solution of NH3.

b.The pH of a 200 ml of a 0.5 M solution of NH3

c. 50 ml of a 0.5 M solution of HCl is then added to the solution of NH3. Determine the pH of the resulting solution.

d. Determine the pH of the solution when a total of 100 ml of the HCl is added.

e. Determine the pH of the solution when a total of 200 ml of
the HCl is added.

f. Determine the pH of the solution when a total of 800 ml of the HCl is added.

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i only know how to get part a, the rest of parts r confusing ...

2007-04-13 18:20:03 · 3 answers · asked by Cecpgc 2

continued... is 0.25 joules/gram-degree C.

2007-04-13 18:15:26 · 2 answers · asked by Anonymous

2007-04-13 18:12:48 · 2 answers · asked by W 1

What is S.F.I.A an acronym for?

2007-04-13 18:09:43 · 2 answers · asked by turobturbine 1

I'm a bit stumped on this one, could somebody help?

2007-04-13 17:33:14 · 4 answers · asked by W 1

i need to balance this equation:
CuSO4(aq) + Ba(NO3)2(aq) --->?????

thanks for your help

2007-04-13 17:17:17 · 3 answers · asked by Anonymous

I am having trouble naming this chain. If anyone can help your response is greatly appreciated. The bond between CH and O is a DOUBLE BOND. Thanks. (Please ignore the periods, that was the only way I could line everything up correctly)


………………CH3
………………...|
H3C----CH2----C----CH3
………………...|
………………CH====O

2007-04-13 16:13:51 · 3 answers · asked by maya 1

Please summarise to me why atoms form chemical bonds.

2007-04-13 15:48:33 · 5 answers · asked by summer 07 1

Here are a few, answer what you can, all the help is appreciated
1) For a certain 1st oder rxn, the rxn goes to 38.5% completion in 480s. Calculate the rate constant for the reaction.
2)Explain the following observations:
a)The boiling point of dimethyl ether is less than that of ethanol.
b)At high densities, gases do not obey the ideal gas law
c)KF is much more soluble in water than CaO
3)Explain each of the following facts:
a)Water has a boiling point about 200 degrees greater than would be expected in comparison with the boiling points of H2S,H2Se, and H2Te
b)Water has its maximum density at 3.98 degrees celcius.
c)Methanol is soluble with water, while hexane is not.
d)Na2O is readily soluble in water, while MgO is not.
e)The freezing point of 0.1M BaCl2 is lower than that of 0.1M NaI and both are lower than that or pure water.

I know its alot, but all the help is really appreciated! Thanks in advance :)

2007-04-13 15:41:09 · 3 answers · asked by Anonymous

Also, is the solution supersaturated? Or, is it unsaturated? Will the solution form a precipitate?

Thanks in advance for your help!

2007-04-13 15:32:01 · 2 answers · asked by Random G 3