Chemistry - June 2007

Does Anyone Know The Ingredients For The Die In Transitional Lenses? I have been searching all over the internet for the process involving the making of the die that goes on the lenses and how it is all done. I am doing a Science project and I want to be able to re-create the environment and ability to create them. It does not matter if it is that transitions lens or any other kind that does the same thing... I just really want to find out how its made! thanks!

2007-06-06 18:11:37 · 1 answers · asked by Anonymous

1. An electroplating unit used for winning aluminum from Al2(03) draws 1.0 ampere of current at a power requirement of 0.29 kilowatt hours per day. If the unit produces 8.0 g of aluminum per day, what is the cost of producing the aluminum for a can weighing 10.0 g at 5 cent per kilowatt hour?

2. The solubility of alum, KAl(SO4)2 times 12 H20, in water solution at 0 degree C is approximately 114 g per liter. For this experiment calculate the mass of alum remaining in solution after completion of the crystallization based on a solution volume of 40mL.

2007-06-06 18:09:05 · 1 answers · asked by Anonymous

High density polyethelene is known for the inability of anything to stick to it. In many respects it's like teflon but you can't cook on it. Teflon, however will stick to metal if the temperature is high enough. Elastomers stick, sort of but can be peeled off.

2007-06-06 17:14:58 · 4 answers · asked by swhtlmmm 1

nonpolar covalent bond
polar covalent bond
ionic bond
hydrogen bond
covalent bond
and why?

2007-06-06 16:49:55 · 5 answers · asked by Fresca 2

2007-06-06 16:45:13 · 2 answers · asked by jaideep mathew 1

households acids/bases experiment

2007-06-06 16:25:10 · 6 answers · asked by BuBbLeS143 1

How many moles of NaOH required to prepare 0.250L of 6.68M NaOH

also how many millimoles of benzoic acid (Fw = 122.1g) are contained in 1.5g of the pure acid??

(The second part has me especially stumped!)

2007-06-06 16:24:18 · 3 answers · asked by philip c 1

For example, a problem I have says:

"What is the molarity of 5.00 g of NaOH in 750.0 mL of solution?

2007-06-06 16:17:16 · 8 answers · asked by Nowhere Man 6

whats the last column in the table called?

2007-06-06 16:10:00 · 9 answers · asked by cc 2

3 Questions:

1. Identify general features of the periodic table (e.g. arrangement of the elements based on atomic structure, groups or families of elements, periods or horizontal rows)

2. Relate the Bohr-Rutherford atomic model to properties of elements and their positions in the periodic table

3. Compare similarities in properties both between and within families of elements to similarities in their atomic structure (e.g. alkali metals, halogens, noble gases).

Most important are 2 and 3
Thanks!

2007-06-06 16:09:38 · 1 answers · asked by Besch 4

If i could get help on this it would be really appriciated!

2007-06-06 15:50:18 · 2 answers · asked by Kae Cie Marie 1

can someone tell me the molarity of 125ml solution containing 23.5g of sodium sulphate. (the MW of sodium sulphate is 322.20)


Cheers agus slainte

2007-06-06 15:43:20 · 3 answers · asked by philip c 1

i need this for my homework

8,000 lbs.

or 3 tons????????

2007-06-06 15:41:39 · 2 answers · asked by Anonymous

2007-06-06 15:35:06 · 11 answers · asked by Fresca 2

One of the treatments for gangrene and "the bends," is hyperbaric oxygenation. This occurs in a chamber in which oxygen is used at a higher-than normal pressures. This are the following informations, 3.00 x 10^3 liter hyperbaric chamber at a pressure of 250cm Hg and at 68F?

Consider the hyperbaric cylinder mentioned above. If the cylinder contains 2735 grams of carbon dioxide instead of oxygen, what volume would the gas occupy at 360 Torr and 850F?

2007-06-06 15:34:04 · 3 answers · asked by Reed 1

Aluminum metal melts at 660 Celsius and boils at 2450 Celsius. Its density is 2.70 grams/cc.

Calculate the following:
A.) Assuming an ideal gas, the volume occupied by 20 kilograms of aluminum vapor at its boiling points and under pressure of 2280 torr.
B.) The volume occupied by 1000 kilograms of the metal at 25 Celsius.
C.) If the specific heat capacity of aluminum metal is 0.89 Joules per gram-degree C, how many calories of energy are required to heat 10 kilomoles of aluminum from 250 Celsius to 500 Celsius.
D.) If 13.5 grams of aluminum were dissolved in an excess of concentrated HCL, what volume of hydrogen gas would be released at STP? You may assume that the ideal gas law holds and that the vapor pressure of water of water is negligible compared to the pressure of the released hydrogen.

Please help! I need to see it step by step! I know i need to use the ideal gas law, but im still confused on where to start?

2007-06-06 15:31:27 · 2 answers · asked by Reed 1

2007-06-06 15:12:49 · 4 answers · asked by Daniel M 1

2007-06-06 15:01:17 · 3 answers · asked by Anonymous

2007-06-06 15:00:38 · 2 answers · asked by Anonymous

2007-06-06 14:48:45 · 4 answers · asked by Lobos 3

if you could also provide the chemical equation, that would be terrific!

2007-06-06 14:42:47 · 4 answers · asked by Anonymous

An increase in temperature for exothermic reaction will_____.
a) shift the reation to the left
b) not enough information provided to answer the question

2007-06-06 14:35:07 · 1 answers · asked by JANET H 1

I have panned it down to fine sands but now I need to separate the gold and silver what can I use?

2007-06-06 14:32:01 · 2 answers · asked by Anonymous

it'd b great if someone could even email me a version. old, new, i dont care.

2007-06-06 14:02:40 · 2 answers · asked by meowz_09 1

2007-06-06 14:01:53 · 1 answers · asked by okay! 1

Okay, I have to write reactant of acid-base reaction.
I understand that I need to remove a proton from acid.
But how do i know which one is acid? I know acid is the
one donate proton , but how do i look at something like
NH2 + H20, and tell which one is acid

2007-06-06 13:56:06 · 1 answers · asked by bluechung0924 1

2007-06-06 13:54:25 · 1 answers · asked by Anonymous

2007-06-06 13:51:26 · 1 answers · asked by Anonymous

the cell


cell pairs Au ^+3/ Au and Pb^+2/Pb

2007-06-06 13:47:26 · 1 answers · asked by ALI L 1

If the half life of sodium-24 is 15 hours, how much remains from an 8.0 g sample at the end of 60 hours?
a) 0.5g
b) 1.0 g
c) 4.0g

2007-06-06 13:43:52 · 3 answers · asked by Jill H 1