Chemistry - August 2007

2007-08-31 23:49:44 · 5 answers · asked by faran999999 1

A) 1-Bromo-3-methylbutane
B) 2-Cyclohexen-1-ol

Pls explain your choice. Thank you

2007-08-31 20:46:26 · 2 answers · asked by sky_blue 1

A) cis-1,3-Cyclohexanediol
B) trans-1.3-Cyclohexanediol
C) cis-1,4-Cyclohexanediol
D) trans-1,4-Cyclohexanediol

Pls explain your choice. Thank you

2007-08-31 20:36:09 · 1 answers · asked by sky_blue 1

2007-08-31 20:02:31 · 6 answers · asked by Anonymous

why?

2007-08-31 19:39:45 · 7 answers · asked by english_improve 3

what is the mass of oxygen produced from the decomposition of 75 grams of potassium chlorate?

2KClO3 --> 2KCl + 3O2

thanks in advance

2007-08-31 19:34:31 · 3 answers · asked by Tammy 2

what are the freezing and boiling points of water in the celsius???

2007-08-31 19:16:14 · 10 answers · asked by Rachel 2

4.the two most abundant isotopes of carbon are carbon-12 (mass 12 amu) and carbon 13( 13amu). their relative abundances are 98.9% and 1.10%. what is the atomic mass of carbon?

5.element X has two isotopes: X-100 and X-104. if the atomic mass of X is 101 amu, what is the relative abundance of each isotope in nature?

thanks in advance

2007-08-31 19:14:53 · 3 answers · asked by Tammy 2

i heard that this thing can be made of red spinach/cabbage i think.

2007-08-31 19:03:34 · 1 answers · asked by Anonymous

We've researched the net, and we now have info 'how'. The search results have resulted to different ways-through amylase, enzymes, and even bacteria. But we're having problems on the materials. Can someone give us any info that might help us? There might be a simpler process in which the materials are easier to get (in our area). The materials we need are bacterial amylse sol'n, fungal amylase powder, amyloglucoside sol'n, human salivary sol'n and some potassium phosphate buffers-and we don't have any idea on how to get them, or maybe we have, but it's still hard. We're thinking of buying but it won't be too wise since we only need a little for each. Maybe they can be replaced by some chemicals. Please... give us any info or lead on how to solve this. This problem is stopping us from starting our experiments. The school can't give us anything, there ain't one of the mentioned above in our school labs. Thanks

2007-08-31 18:55:45 · 0 answers · asked by manimefrances 1

2007-08-31 18:46:35 · 3 answers · asked by Anonymous

a. what is the mass of silver needed to react with chlorine to produce 84 g of silver chloride?

b. how many liters of carbon monoxide at STP are needed to react with 4.80 g of oxygen gas to produce carbon dioxide?

2007-08-31 18:40:23 · 2 answers · asked by Tammy 2

Octane, C8H18, boils at 125 degrees C as compared to water, which boils at 100 degrees C. This information suggests that the dispersion forces in nonpolar octane are stronger than dispersion forces and hydrogen bonding in water.

Please explain your answer.

2007-08-31 18:08:05 · 2 answers · asked by Anonymous

2007-08-31 17:44:55 · 3 answers · asked by tanu v 1

2007-08-31 17:39:51 · 2 answers · asked by Anonymous

avocados are 125 pesos per kilogram. what is the cost in cents of an avocado that weighs 0.45 lb if the exchange rate is 11 pesos to the dollar?

2007-08-31 17:08:21 · 3 answers · asked by devilishly curious64 1

2007-08-31 17:03:03 · 2 answers · asked by Anonymous

much detail as possible please

2007-08-31 16:51:53 · 4 answers · asked by Anonymous

2007-08-31 15:47:49 · 1 answers · asked by awesome 2

The equilibrium constant of the reaction A <--> 2B + C is 25.6 mol^2/L^2 at an unspecified temperature. The equilibrium concentrations in this system are [A]= 0.110 M, [B]= 1.78 M and [C]= 0.890 M. The reaction system is slugged with an additional amount of reactant, equal to a concentration of 0.270 M, instantaneously raising the [A] concentration to 0.380 M. The system then undergoes a shift and reestablishes equilibrium. Calculate the new equilibrium concentrations.


I'm trying to learn about chemical equilibria, and Le Châtelier’s principle; I think if I have the solution to this problem, it will a little bit more clear.

2007-08-31 15:44:47 · 2 answers · asked by Anonymous

Pls tell me the reagents used and how the test works.
I would be really glad if u can elaborate.

2007-08-31 14:30:36 · 1 answers · asked by sarjan_sarge 3

A majority of it's substance is hydrogen. Hydrogen is one of the most reactive elements....

2007-08-31 14:24:58 · 4 answers · asked by lilys.petal 2

2007-08-31 14:16:20 · 6 answers · asked by Anonymous

You are given a worked wooden item from an archaeological dig believed to date to during the last glaciation. As such, the artifact would be another piece of evidence in favor of the hypothesis that North America was settled prior to the end of the last glaciation. You analyse the artifact and find that it has a specific activity of 2.2 dpm/g. How old is the artifact?

2007-08-31 13:30:27 · 2 answers · asked by Reasons 3

how would you write this CuHCO3?

2007-08-31 12:21:36 · 4 answers · asked by Anonymous

Suppose a piece of lead with a mass of 14.9 g at a temperature of 92.5C is dropped into an insulated container of water. The mass of water is 165 g and its temperature before adding the lead is 20.0C. What is the final temperature of the system?

This is what I have so far...

q = (m) (T) (Cp) = (14.9g) (92.5C - Tf) (0.449 J / g * C)
q = (m) (T) (Cp) = (165g) (Tf - 20.0C) (4.184 J / g * C)

I have been working on this problem for 2 days now and I am having alot of trouble getting an answer. Help is highly appreciated!

Thanks so much!

2007-08-31 09:31:48 · 1 answers · asked by hotlilmamax2 1

2007-08-31 09:18:38 · 2 answers · asked by GCTA 4

The density of ethylene glycol is 9.35 lbs/gal and water is 62.5 lbs/ft^3.
Assuming the density of water/ethylene glycol is simply the weighted average of the amounts of the two liquids mixed; what is the density in g/cm^3, of a mixture containing 1.00 gallons of ethylene glycol and 3.00 gallons of water?

Please show your work so I can learn how to do this type of problem!! Thanks...

2007-08-31 08:51:50 · 1 answers · asked by C K 3

HCl + Br2 ------>

2007-08-31 06:38:36 · 3 answers · asked by Anonymous

HCl + THC ---->

2007-08-31 06:35:36 · 1 answers · asked by Anonymous