Chemistry - September 2007

fast

2007-09-05 03:48:52 · 4 answers · asked by That/Cool/Person 2

2007-09-05 03:44:05 · 5 answers · asked by Ruby M 1

I know carbocation stability proceeds tert>sec>prim, but does that mean carbanions are opposite?

one more detail. My problem is showing a butane with a lone pair on the second carbon. I have to compare relative stabilities with a CH2 substituent on a cyclohexane. I need to know WHY one or the other is less stable.

2007-09-05 03:36:40 · 3 answers · asked by The GMC 6

1. State the relationship between wavelength and energy of light.

2. Every element has its characteristics emission spectra. What elements give of yellow light, red light and violet light?

3. Using the spectrum of the hydrogen atom, how are the following colors produced?

A. Red
B. Green
C. Blue
D. Violet


-----> Which color has the highest energy and the lowest energy?

2007-09-05 03:22:03 · 3 answers · asked by Anonymous

Beginning with diethyl malonate and any other reagents of your choice, show an efficient synthesis of methyl 2-ethylbutanoate.

2007-09-05 02:59:04 · 2 answers · asked by Anonymous

If an aldol reaction was attempted using Benzaldehyde and Formaldehyde(with a base catalyst), how many products would be expected? Explain your answer.

2007-09-05 02:57:38 · 3 answers · asked by Anonymous

2007-09-05 02:49:32 · 3 answers · asked by Shanetta W 1

a) ammonium phosphate
b) ammonium nitrate
c) urea

2007-09-05 02:18:23 · 1 answers · asked by jack_hock2003 1

2007-09-05 00:27:53 · 1 answers · asked by saurabh d 1

how are the atoms of the same element similar to one another?

2007-09-04 21:10:37 · 5 answers · asked by crappienella_emotera16 2

2007-09-04 20:08:04 · 2 answers · asked by Tawie 1

2007-09-04 20:00:42 · 2 answers · asked by Selva M 1

what is the details and preparation of solfuric acid?

2007-09-04 19:32:40 · 3 answers · asked by m n 1

2007-09-04 19:29:58 · 1 answers · asked by jennifer w 1

2007-09-04 18:45:24 · 1 answers · asked by ram 1

OMG, thank you so much!

2007-09-04 17:47:50 · 1 answers · asked by Anonymous

This puzzles me. I know there is regular soda, made with hfc syrup, and then there are diet sodas, either made with sucralose or, more common, aspartame. Both are extremely bubbly. Now this is where I think it gets odd.

If you take regular soda pop and then add a packet of artificial sweetener, ALL of the carbonation quickly escapes the soda. The same thing happens when I add sugar to diet soda.

If the artificial sweetener and sugar separately can make a soda with carbonation, what happens when the two combine to make all carbination escape?

2007-09-04 17:30:35 · 2 answers · asked by Anonymous

2007-09-04 17:30:07 · 8 answers · asked by Anonymous

okay so i have to have a topic by tomorrow.
i've been researching for a topic with dry ice.
can someone give me an advanced topic that has to do with dry ice.

whoever gives me a purpose with the topic gets 10 points.
thanks SO much!

oh & also:
Projects involving experimental work with vertebrate animals, humans,
recombinant DNA, body tissue, pathogenic organisms or controlled substances
are NOT Permitted.

^^taken exacly from the science fair rule book thng.

2007-09-04 17:20:53 · 5 answers · asked by Victoria 4

I am studying analytical techniques at the moment in senior chemistry and I am having trouble trying to understand emission spectroscopy. Information on chemical theory, its application and just a brief overview would really help. Please Help!

2007-09-04 16:49:40 · 1 answers · asked by H 2

send it to me e-mail @ burntcrackerofmeangreens@yahoo.com. can't have a black background. or just write me telling where to find it i need it to be the pictures of the elements of the table not the table

2007-09-04 14:50:02 · 1 answers · asked by dalyn 1

The radioactive element iodine-131 is commonly used in treating medical problems. It has a half-life of 8.1 days. How long does it take for 99% of a sample of iodine-131 to decay? Give both an exact answer and an approximation correct to three decimal places.

2007-09-04 14:42:01 · 2 answers · asked by Ask or Answer 2

Which of these is the most dense?
--An object with a volume of 2.5L and mass of 12.5kg
--An object with volume of 139mL and a mass of 93g
-- An object with a volume of 2.12 x 10^-3 m^3 and mass of 4.22 x 10^4 mg
-- An object with volume of 3.91 x 10^-24 nm^3 and a mass of 7.93 x 10^-14ng
--An object with a volume of 13dm^3 and a mass of 1.29 x 10^3 ug

I got D but I am reworking it now, think my conversion was wrong.

2. And this one I couldnt figure out how to set it up exactly :

An individual suffering from high cholesterol level in her blood has 232mg of cholesterol per 100 mL of blood. If the total blood volume of the individual is 5.2l, how many grams of total blood cholesterol does that individual contain?

Is the start 232mg/100mL then convert from there?

10 points!

2007-09-04 14:30:12 · 2 answers · asked by Calib 1

okay.
i know you all think that i'm lazy and i dont want to do my homeworkk, but really! i need help.
my assignment was to list 3 solids, 3 liquids, 3 gas, and 3 matter that has all 3 solid, liquid, and gas.

so far i got...

SOLID: iron, carbon, and boron
GASES: water vapor, oxygen, helium
LIQUID: mercury, water, bromine

anddd the help i need is ...
3 element that is all three liquid, solid, and a gas.
please help me.

2007-09-04 14:24:46 · 2 answers · asked by Jessica :]] 1

I have been trying to figure it out form 20 min and I am going insane and this is just not my subject. If you can can you explain to me how you got the answer.
If the number of electrons in an atom is 35 and its mass number is 80, calculate the following:
a. The number of protons.
b. The atomic number.
c. the number of neutrons.

2007-09-04 14:19:47 · 3 answers · asked by Anonymous

can hydrocloric acid based concrete acid etching solution have an effect on glass, i got some patio blocks which is intermixed with glass bricks, how can i protect the glass bricks, someone said that if i cover the bricks with paper they will be ok.

2007-09-04 13:55:05 · 3 answers · asked by olie b 1

Is gasoline a pure substance, a homogenous mixture, or heterogeneous mixture? Explain..


If pure gold is classified as 24-karat gold, then 10-karat gold must be a _____________ mixture.
a. homogeneous b. Heterogeneous

2007-09-04 13:37:50 · 3 answers · asked by KU! 3

what is the main component inside the air bubbles from boiling water?

2007-09-04 12:29:00 · 2 answers · asked by mwali02 2

energy cannot be converted from one form to another
kinetic energy is conserved
potential energy is conserved
none of the above

2007-09-04 11:57:48 · 11 answers · asked by notachemwiz 1

The decomposition of N2O5(g) to NO2(g) and O2(g) obeys the first-order kinetics. Assuming the form of the rate law is
Rate = - D[N2O5] / Dt = k[N2O5]
where k = 3.4 x 10^-5s^-1 at 25°C.
What is the half-life for the reaction described?

2007-09-04 11:54:58 · 1 answers · asked by Anonymous