Chemistry - October 2007

2007-10-09 19:17:30 · 2 answers · asked by chase_thepyro 1

Please help.



Where is this element most abundant?

Are there any disadvantages or dangers for uses this element?


Are there any negative side effects to producing/using/extracting this substance?

When is it used the most?


How is it used?

2007-10-09 19:12:57 · 1 answers · asked by Saм 2

Calculate the average value of Φ for the particle-on-a-ring system. The wavefunctions are Ψ(Φ) = 1/√2 * e^(imΦ) m = 0,+/-1, +/-2...

I know I should set up an equation like this:
∫ (-∞ --> ∞) Ψ(Φ)* Φ(hat) Ψ(Φ) dΦ

Except I have no idea what Φ(hat) is..?

THANK YOU SO MUCH IN ADVANCE!!!!!!

Love,
Mary ♥

2007-10-09 19:10:17 · 2 answers · asked by ♥ Mary ♥ 3

Calculate the average value of Φ for the particle-on-a-ring system. The wavefunctions are Ψ(Φ) = 1/√2 * e^(imΦ) m = 0,+/-1, +/-2...

I know I should set up an equation like this:
∫ (-&inf; --> &inf;) Ψ(Φ)* Φ(hat) Ψ(Φ) dΦ

Except I have no idea what Φ(hat) is..?

THANK YOU SO MUCH IN ADVANCE!!!!!!

Love,
Mary ♥

2007-10-09 19:09:36 · 2 answers · asked by ♥ Mary ♥ 3

mixture called suspension
mixture called solution
solution and a suspension
mixture only

2007-10-09 19:07:25 · 4 answers · asked by Anonymous

I'm just wondering if the two mentioned compounds are pertaining to the same substance. I hope someone could clarify this; back-up explanation will be much appreciated. Thanks!

2007-10-09 19:00:29 · 1 answers · asked by ^_^ 1

I am completely confused, water potential is the difference in free energy or chemical potential between pure water and water in cells and solutions, but i don't understand the logistics of this equation.

2007-10-09 18:43:15 · 1 answers · asked by Isosohungy 1

2007-10-09 18:40:43 · 2 answers · asked by Anonymous

If I was wrong could you please explain.

In a balanced chemical equation the number of moles of products must be equal to the number of moles of reactants.

I said (True)

A number in front of a formula in a balanced equation represents the number of moles of that substance in the chemical change.

I said (True)

A mole ratio is defined as a ratio of the number of moles of reactants to the moles of products.

I said (False)

A mole ratio is a ratio between the number of moles of any two species involved in a chemical reaction.

I said (True)

The reactant with the fewest number of moles is the limiting reactant in a chemical reaction.

I said (True)

2007-10-09 18:38:34 · 1 answers · asked by S281 2

A TLC plate showed two spots of Rf 0.25 and 0.26. The plate was removed from the developing chamber, dried carefully, and returned to the developing chamber. What would you expect to see after the second development was complete?

2007-10-09 18:34:00 · 1 answers · asked by Hye K 1

The mineral apophyllite has the chemical formula:
KCa4Si8O20(F,OH)8H2O
My question is concerning the (F,OH) as whenever there is a comma like that in a chem formula there is supposed to be a "solid-solution". yet some mineralogy books say it is not a solid solution as such and in principle represents two distinct minerals: Fluoroapophyllite & Hyroxyapophyllite. So I am confused! ANy help would be appreciated.

2007-10-09 18:22:35 · 1 answers · asked by Gideon 1

In addition, list observations if you put 3 drops of water and 3 drops of oil together in a test tube.

2007-10-09 16:50:45 · 1 answers · asked by mz. * 1

2007-10-09 16:43:14 · 1 answers · asked by zikidy zizack 3

2007-10-09 16:36:21 · 2 answers · asked by Anonymous

if you can give me any links that would tell me everything about magnesium it would help.. thanks

2007-10-09 16:12:48 · 8 answers · asked by gio1991a 2

Which of the following compounds can exist as cis and trans isomers ?

a) CHCl=CHCl

b) CH2=CH-CHCl2

c) ClBrCHCl

d) CBrBr=CH-CH2Cl

e) 2-pentene

you must enter all true statements

2007-10-09 15:31:04 · 2 answers · asked by physicsisgay 2

2007-10-09 15:29:42 · 1 answers · asked by kelli s 1

First find the product(s) to the equation
Then balance the equation
Then list the type of reaction

I don't understand why Zn + HCl doesn't make a product of ZnCl2, because an element + a compound doesn't equal a compound, that isn't any type of reaction. What am I doing wrong?

Zn is +2 charge, H is a +1 charge because Cl is a -1 charge.
Then I swapped them to make ZnCl2 and left H out, but it just doesn't make sense.

2007-10-09 15:19:56 · 1 answers · asked by Average Joes 4

please provide both the answers will be very help full

2007-10-09 14:51:44 · 2 answers · asked by the champ 1

cars rust when a chemical change turns shiny iron into dull brownish-red dust!

2007-10-09 14:47:59 · 2 answers · asked by Anonymous

I want to know exactly how we would identify the reactants or products in a balanced equation and determine their phases.

2007-10-09 14:45:25 · 3 answers · asked by lisazhang112004 1

where in your home can you find it?

2007-10-09 14:28:41 · 5 answers · asked by Anonymous

Both water and dichloromethane have dipole-dipole intermolecular forces, so shouldn't they be miscible?

If they aren't miscible, shouldn't they separate
according to their densities, which are in proportion to their intermolecular forces?

2007-10-09 13:45:10 · 1 answers · asked by ik3ra 2

(a) n = 1 l = 1 ml = 0 ms = +1/2


(b) n = 2 l = 0 ml = 1 ms = -1/2


(c) n = 2 l = 1 ml = 0 ms = -1/2


(d) n = 2 l = 0 ml = -1 ms = -1/2


(e) n = 3 l = 1 ml = 2 ms = +1/2

2007-10-09 13:38:16 · 3 answers · asked by tibsy2007 2

2007-10-09 13:04:48 · 4 answers · asked by Anonymous

2007-10-09 12:55:14 · 2 answers · asked by Anonymous

what is the product of an alkane and an acid?

(2-chlorobutane + phosphoric acid.)

2007-10-09 12:47:42 · 1 answers · asked by C'est Comme Un Rêve 3

2007-10-09 12:10:11 · 2 answers · asked by lavender 3

It takes 9.30 J to raise the temperature of an 8.70 g piece of unknown metal from 22 degrees C to 24.8 degrees C.

2007-10-09 12:03:07 · 1 answers · asked by Anonymous

It's apart of my chemistry homework, I know salt isn't a lipid (and lipids don't dissolve in water, right?) and I didn't think that salt dissolved in water, does it?

2007-10-09 11:39:21 · 4 answers · asked by Nicole 5