Chemistry - December 2006

2006-12-21 21:02:51 · 2 answers · asked by umakant 1

2. A student, following the procedure described in this module, used water as the solvent and encountered some interesting problems. Comment on the effect, if any each of the following situations could have had on the experimental results.
a) The unknown, a white powder, failed to dissole in the solvent.

b). The student returned to the laboratory instructorr for a different solid unknown dissolved, but bubbles were seen escaping from the solution almost immediately after the addition of the solid.

c.) As the student was setting up the apparatus to measure the freesing point of the unknown solution, the thermometer assembly broke. The student obtained a new thermometer and performed the experiment as instructed.

2006-12-21 20:27:12 · 1 answers · asked by Anonymous

only sensible answers plz.

2006-12-21 19:45:17 · 4 answers · asked by juno 1

red object appears red due to the absorption of wavelength of the red colour.
How about the colourless object???
What is the range of the wavelength the colourless object absorb??
thx

2006-12-21 19:45:08 · 8 answers · asked by terem 1

freezing point of water being zero degrees.

2006-12-21 19:32:33 · 7 answers · asked by juno 1

2006-12-21 19:25:20 · 8 answers · asked by juno 1

also is it safe for alluminum

2006-12-21 18:34:05 · 3 answers · asked by pblrbck 1

2006-12-21 16:43:40 · 8 answers · asked by chinita 1

Something to do with atomic bombs

2006-12-21 16:38:34 · 3 answers · asked by Anonymous

2006-12-21 16:36:28 · 8 answers · asked by Cameron 2

How can you assume that the change in volume of a graduated cylinder is the same as the element sample?

2006-12-21 15:53:54 · 1 answers · asked by Anonymous

Calculate the amount of heat required to change 50.0 g ice at -20.0 °C to steam at 135 °C. (Heat of fusion = 333 J/g; heat of vaporization = 2260 J/g; specific heat capacities: ice = 2.09 J/g_K, liquid water = 4.184 J/g_K, steam = 1.84 J/g_K)
(answer: 156 KJ)

But my question is how do you solve for Boiling. My teacher said get the water converted to steam we use heat of vaporization. So what do I do? for water I got 78KJ(0 to 100 degress celsius)

2006-12-21 15:17:17 · 4 answers · asked by avalentin911 2

it is an o above

2006-12-21 15:12:09 · 5 answers · asked by shorty46_1991tannor 1

If you can phisically see the color of the chackras what is the color of the crown seventh chackra

2006-12-21 15:11:51 · 7 answers · asked by Wisdom=Magenta 3

2006-12-21 15:05:17 · 7 answers · asked by Anonymous

2006-12-21 14:45:15 · 3 answers · asked by Gideon 1

Complete the and balance each of the following neutralization reactions, name the products, and write the net ionic reactions.

a. Al(OH)3 + HCl -> ?
b. CH3COOOH + Sr(OH)2 -> ?

-Christopher

2006-12-21 14:45:10 · 4 answers · asked by Christopher 1

not what it is used for. I don't need to know what it's molecular formula is. I just need to know what it is.

2006-12-21 14:30:43 · 5 answers · asked by nc123135 1

If you must have a specific pine tree assume it is a Western White Pine

2006-12-21 14:12:20 · 2 answers · asked by musical902003 4

2006-12-21 14:04:31 · 3 answers · asked by pinkiezbox 1

a. 2NaCI+H2SO4+ ---->HCL+NaSO4
b. NH3+H2O----->2NH4OH
c. KOH+H2SO4------>KHSO4+H2O
d. 2Na+S ------>2NaS

2006-12-21 13:59:30 · 9 answers · asked by Anonymous

The aluminum is cut into tiny pieces and the KOH had been added with 80% water.

2006-12-21 13:44:46 · 6 answers · asked by nc123135 1

I like need some major help on balancing these plz. Im trying to balance these and i just cant.

ALL the numbers in each equations are subscripts.


A.) C4H10 + O2 --------> CO2 + H2O
******************************...
B.) Na + H2O ----> NaOH + H2
******************************...
C.) NaF + FeCl3 -----> Na3FeF6 + NaCl
******************************...
D.) NH3 + O2 -----> NO + H2O
******************************...

2006-12-21 13:44:45 · 4 answers · asked by Pearl 2

Is there a reliable formula to convert urine levels to blood?. Can they use a urine alcohol to prove intoxication while driving a car?

2006-12-21 12:38:54 · 3 answers · asked by papamarlee 2

2006-12-21 11:48:02 · 2 answers · asked by cucakid 1

What is an atom that has gained or lost an electron?
is it an ion or ionic or ionic bond????I'm so bad at science argh.

2006-12-21 10:43:56 · 5 answers · asked by Anonymous

2006-12-21 10:42:49 · 10 answers · asked by Ayotemi 1

its from the periodic table of elements. to find the nuetrons u minus the atomic mass- atomic number.

2006-12-21 10:31:18 · 3 answers · asked by STAN 3

What forces between water molecules are primarily responsible for many of water's physical properties?

a. ionic bonds
b. covalent bonds
c. The unshared electrons on the oxygen atom
d. gravity
e. Hydrogen bonds

2006-12-21 10:28:41 · 6 answers · asked by JoAnna 2

since calcium phosphate is Ca3(PO4)2
molar mass of this compound is 310.2 then there are 8 oxygen atoms, right?

2006-12-21 10:26:28 · 2 answers · asked by silentcargo 3