Chemistry - June 2007

2007-06-21 04:52:40 · 3 answers · asked by Anonymous

Which of the following salts would cause a precipitate to form with a solution containing bromide ions? Select all that apply

a. Hg2(NO3)2
b. Hg(NO3)2
c. NaCH3CO2
d. Ba(NO2)2
e. AgClO3

2007-06-21 04:41:52 · 4 answers · asked by Anonymous

2007-06-21 04:40:22 · 4 answers · asked by john f 1

I know that the equilibrium moves towards the reactants or the products that absorb the heat... I think. This might have something to do with the question

2007-06-21 04:22:52 · 3 answers · asked by mrsjoshgroban 1

2007-06-21 02:52:34 · 1 answers · asked by sareenaferoz 1

2007-06-21 02:51:50 · 10 answers · asked by sareenaferoz 1

Hi,

I’m looking for a natural glue which I can use to attached to medium thick papers together. Does anyone know about such a thing?

This glue have to be digestible (i.e, if someone eat it nothing will happen to him) and hold for a long time under natural conditions.

Moreover, if you know on such a glue, but which doesn’t fit to papers, please let me know too, maybe I can replace the other parts (I just need it to glue together).

Thanks

2007-06-21 02:29:02 · 4 answers · asked by Hero 1

.. and also organic and inorganic compunds?

2007-06-21 02:25:53 · 5 answers · asked by Anonymous

2007-06-21 02:13:43 · 2 answers · asked by centralian 2

2007-06-21 02:12:55 · 2 answers · asked by AK 2

Does any1 know what the intramolecular forces are between condensation polymers? (e.g hydrogen bonds/dipoles?)

And how does increases in temperature affect the polymer chains for condensation polymers

2007-06-21 01:56:50 · 1 answers · asked by joy vision 3

..and also its connection to other branches of chemistry like analytical and physical?

2007-06-21 01:42:25 · 5 answers · asked by Anonymous

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2007-06-21 01:35:41 · 11 answers · asked by kathy w 2

2007-06-21 00:07:08 · 5 answers · asked by janeeyre444 1

2007-06-21 00:05:08 · 8 answers · asked by atljasmine4 1

Is "concrete" a Homogenous or Heterogenous Mixture?

Please help me out. I'm really confused. I've asked my teacher about this but he's also not sure.

Thanks!

2007-06-21 00:03:36 · 6 answers · asked by carbonara 2

2007-06-20 16:11:57 · 3 answers · asked by roach_309 1

2007-06-20 16:08:16 · 8 answers · asked by clark_reid_itl 1

2007-06-20 15:15:55 · 4 answers · asked by Anonymous

ie: global warming, ecoli, mad cow ect

make it a good length

2007-06-20 15:02:34 · 6 answers · asked by Answer Champion 3

hey guys
so i'm a bit confused about this whole covalent bond and ionic bond.

is it like. a covalent bond is stronger than an ionic bond intramolecularly but ionic is stronger than covalent intermolecularly?

please explain. and what exactly is a covalent network solid? is that the same thing as a covalent bonded molecules except somehow the intermolecular strengths are a lot stronger?

2007-06-20 14:51:56 · 5 answers · asked by Anonymous

2007-06-20 14:27:19 · 23 answers · asked by laylaw 2

Would you be able to swim at all in pure ethyl?

2007-06-20 12:28:36 · 12 answers · asked by Claudio-o 1

2007-06-20 12:08:24 · 2 answers · asked by jack w 4

We just ran a Gen Chem experiment today to make ferrofluid. The experiment usually works, but today it didn't. The Fe(III) and Fe(II) reagents were made correctly and only a couple of days old (I know that Fe(ii) is air oxidized). Is it possible my magnets have gotten weak? They are about 5 years old or so. I am not that familiar with magnets to know if they can become "de-magnetised". Any suggestions would be great. I need to fix the problem before the next set of students. Thanks!

2007-06-20 11:13:17 · 3 answers · asked by Anonymous

I have been search the website because I couldn't find the reaction in my textbook. Would anyone happen to know of a site that might be able to explain this reaction?

THANKS!

2007-06-20 10:40:24 · 3 answers · asked by Tropical Mango 2

1)If you have solid sodium carbonate(Na2CO3) reacting with aqueous HF acid should the overall ionic equation show sodium carbonate as ions since they dissociated in the water of the aqueous HF or should they be an ionic compound since the question says it is solid? Why? Here's what I think it is but I'm not sure.

Molecular Equation
Na2CO3(s)+2HF(aq)===>2NaF+H2O+CO2

Overall ionic equation
2Na(+)+CO3(2-)+2HF===>2Na(+)+2F(-)+H2O+CO2
could someone please elaborate, I'm not sure why or why not sodium carbonate or the sodium fluoride should be written as ions. So if a soluble solid is added to something dissolved in water will it dissociate into ions too.

2)Can something covalent dissociate in water? How do you write the overall ionic equation for SO2+H2O===>H2SO3? Will the SO2 dissociate into ions? Will the H2SO# dissociate into ions??

Thank you for checking my work and helping me with #2

2007-06-20 10:10:13 · 1 answers · asked by Anonymous

when a researcher receives a grant or a fellowship, buys something like an HPLC or NMR, what happens to the devices after the researcher has either retired, moved, quit, etc.

i would assume government grants contain clauses that describe the process by which these items would be donated or sold, but im wondering if there are certain grants that just allow a guy to bring an NMR back to his house and set up shop.

2007-06-20 09:49:52 · 2 answers · asked by gordonliu 2

Yes I know what a reducing Sugar is, the ring breaks ot the weakest bond between the O-Carbon 1. It yields a H to C5 and a double bond created between C1 and the O.
Why can this not happen under alkeline conditions of the Sucrose molecule?
By adding acid, what makes it happen then?

Many Many Thanks....

2007-06-20 09:38:53 · 1 answers · asked by lavito 3

A supertanker spilled a total of 143,874 barrels of oil. How many liters would this be? Given 1 barrel = 42.0 gal; 1 gal = 4 quarts and 1 quart = 9.46x10-4 m3?

The pressure exerted on a substance is 17.218 g/(m*s2). What is the pressure in kg/(nm*cs2)?

2007-06-20 09:35:01 · 3 answers · asked by Anonymous