Chemistry - November 2007

Predict the reactivity of the following substrates in both silver nitrate in ethanol (Sn1 conditions) and sodium iodide in acetone (Sn2 conditions):

1) 1-bromobutane
2) 1-bromo-2-butene

2007-11-24 16:56:48 · 1 answers · asked by James 1

A metal has a specific heat capacity of .899 Jg-1K-1 How much energy is required to raise the temperature of 2.00 kg of the metal by 80 K?

(A) 80 kJ
(B) 35.96 kJ
(C) 179800 kJ
(D) 143.84 J
(E) 143.84 kJ

Please explain.

2007-11-24 16:54:38 · 1 answers · asked by Anonymous

Lithium bromide crystallizes with a NaCl type structure. What is the total number of ions (positive and negative) in the unit cell?
I have 8... but I'm not sure... any help would be great. Thanks!

2007-11-24 16:35:22 · 2 answers · asked by ¿ /\/ 馬 ? 7

Which one of the following applies:
a) Heisenberg uncertainty principle
b) Pauli exclusion principle
c) Hund's rule (principle of maximum multiplicity)
d) Shielding effect
e) Wave nature of matter

1. Can be used to predict that a gaseous carbon atom in its ground state is paramagnetic
2. Explains the experimental phenomenon of electron diffraction
3. Indicates that an atomic orbital can hold no more than 2 electrons
4. Predicts that it is impossible to determine simultaneously the exact position and velocity of an electron

2007-11-24 15:14:50 · 3 answers · asked by missingfeet 2

My 13 yr old daughter is working on a project for school. Is there a site that has a list of everyday materials that go with the periodic table? Ex. copper=penny, lead=fishing weight, ect

2007-11-24 14:57:50 · 2 answers · asked by Rod B 1

I have to do a science fair project and need to measure the viscosity of chocolate syrup when it is cooled. Any ideas how I can measure the viscosity, I'm really clueless on this?

2007-11-24 14:20:59 · 4 answers · asked by Blue 4

Give the n and L values for the following:

a. 1s

b. 4d

2007-11-24 14:10:50 · 2 answers · asked by aaadaj 1

Name the orbital described by the following quantum numbers.

a. N = 3 L = 0

b. N = 3 L = 1

c. N = 3 L = 2

2007-11-24 14:10:18 · 5 answers · asked by aaadaj 1

Write the electron configuration of Bromine.

2007-11-24 14:09:32 · 1 answers · asked by aaadaj 1

What salt would be produced by the reaction of H2SO4 with LiHCO3?
a. Li2S b. LiSO4 c. Li2SO4 d. Li2CO3

2007-11-24 13:09:03 · 3 answers · asked by Anonymous

Please explain as soon as possible. Give me the source.

2007-11-24 12:40:40 · 6 answers · asked by Tiffany 2

What do the embalmers do with the body fluids, i.e. blood, and, how long before the body decays into a pool of flesh? I've heard it's 200 yrs. or so.

2007-11-24 12:40:04 · 4 answers · asked by Montesa 3

scientifically lol...

even when the bathroom is steamy after taking a shower, its still really cold!

2007-11-24 12:35:12 · 5 answers · asked by mystery_girl07 2

The reaction equation is: 2KClO3-->2KCl+3O2

2007-11-24 12:21:28 · 1 answers · asked by Anonymous

2007-11-24 12:17:24 · 1 answers · asked by B G 2

2007-11-24 12:08:16 · 3 answers · asked by chemist 1

or how can I make an odorless petroluem distillates solvent?

2007-11-24 11:51:54 · 1 answers · asked by mhike 1

the general formula Cu[NH3}x]SO4.H20 in which the NH3 molecules are bound to the CU2+ ion and are acting as ligands, why is it necessary to use very conc.NH3 solution to prepare the complex?

and what would happen if i wash the crystals with water?

2007-11-24 11:44:09 · 1 answers · asked by Anonymous

NH3 H20 F- NA+ AL3+ CH4

2007-11-24 11:40:42 · 2 answers · asked by Anonymous

I did a lab on science class and the teachers gave us some questions to add to our lab report.
It says, write the chemical equation for soap production. (it may be unbalanced)

I reall have no idea what to do..

What we used was
*Castor oil
*Sodium Hydroxide (20%) - NaOH
*Sodium Chloride (salt) - NaCl

and we ended up with soap.

Please help i would gladly appreciate it.

2007-11-24 11:32:43 · 3 answers · asked by Anonymous

Our chemistry class is going over radiation, and I just have a few questions.

For Beta decay, does a neutron turn into a proton and electron, and then the electron given off as a Beta particle? And if so, how does this happen?
Also, how does a proton and electron turn into a neutron in Electron Capture?

And what is the decay constant?
Also, for the equation: Rate = k[A] where k=decay constant and [A] is the amount of material, what can be plugged in for the rate? If half-life is plugged into for the rate, does the equation work?

2007-11-24 11:23:17 · 2 answers · asked by silvershadow0001 1

2007-11-24 11:17:16 · 5 answers · asked by jamie 1

a. 0.67N
b. 2.0N
c. 4.0N
d. 6.0N

2007-11-24 11:15:11 · 4 answers · asked by tessababy992006 1

4Al +3O2 ---> 2Al2O3

if 5.0 moles of Al react with excess O2, how many moles of Al203 can be formed?

2007-11-24 11:12:51 · 3 answers · asked by Anonymous

Suppose the unit cell of a crystalline ionic compound consists of a cube with ions of element X at each corner and ions of element Y at the centre of each face. What is the empirical (simplest) formula of this compound?
a. XY4
b. X3Y
c. X3Y4
d. XY3
e. X4Y
f. X4Y3
g. X2Y3
I'm not really sure how to approach this problem... I know there's 8 atoms of X and 6 atoms of Y but does that determine my ratio?

2007-11-24 11:12:06 · 2 answers · asked by ¿ /\/ 馬 ? 7

please help me answer and show work!!
Cu + 4HNO3= Cu(NO3)2 +2NO2 +2H2O
You have 9.35 g Cu and .4 mol of HNO3

1. how many mol of Cu were initially dropped in the nitric acid?
2. One of these reactants were in excess, which and how did you know? (show the ratio)
3. What mass of Cu reacted?
4. What mass of Cu remained after the reaction was over
5. WHat volume of gas measured at STP escaped during the reaction?
6. what is the name of the blue crystalline substance left behind after the evaporation of the water?
7. WHat should be the mass of this blu crystalline substance? (formed after the reaction is completed, removing the unreacting copper and heating the remaining liquid to evaporate the water and form it)?

2007-11-24 11:09:06 · 2 answers · asked by papi 5

2007-11-24 11:06:59 · 2 answers · asked by Anonymous

Hi I have this pre-lab question that needs to be quickly answered. Please help..

I need to find the coefficients for this equation, I've tried couple of times but didn't get the answer.

K2Cr2O7 + H2SO4 + C2H5OH ---> Cr2(SO4)3 + K2SO4 + CH3COOH + H2O

Thank you

2007-11-24 10:52:48 · 2 answers · asked by miss_frd 1

here are my questions..
Consider the following reaction:
2Al(s) + 3Cl2(g) ---> 2AlCl3(s) deltaH = -1390.81

a. Calculate the heat produced when 10 grams of AlCl3 forms?
b. How many grams of Al are required to produce 1.00 kJ of energy?
xxxx
The heat of combustion for a sample of coal is 23.0 kJ/g. what quantity of this coal must be burned to heat 500.0g of water from 20(degrees Celcius) to 90(degrees celcius)?
xxxx
if 5.0 kJ of energy is added to a 15.5g sample of water at 10(degrees celcius) the water is still a liquid. Why?
xxxx
you have a 28.2g sample of a metal heated to 95.2(degrees C). the final temperature of the water is 31(degrees C. assuming no heat is lost to the surroundings nor the calorimeter, calculate the heat capacity of the metal.

I WOULD APPRECIATE YOU IF SOMEONE COULD HELP ME FIGURE OUT WHAT I AM DOING WRONG!
just letting you know i am in HS not college! i would appreciate knowing the correct answers so i wont have to repeat this class in college!

2007-11-24 10:38:43 · 2 answers · asked by niki_0723 1

I am a high school student an I need the crystal drano to do an experiment for science. I've looked everywhere; local stores such as Acme and super G. But I hven't been able to find it

2007-11-24 10:31:43 · 2 answers · asked by mathwiz 1