Chemistry - October 2006

the law of conservation of mass states that matt can not be created nor destroyed, only changed from one form to another. this being said, can you think of any scenarios where the Law of Conservation of Mass does not apply?


take a stab at it...thanks

2006-10-10 13:13:32 · 4 answers · asked by Anonymous

Can you explain it so a freshman in High School can understand it?

2006-10-10 13:12:49 · 2 answers · asked by canflippuck6 4

i am making a model of alluminum. i think that i have to show the electrons, protons, and neutrons, but im not sure. my teacher doesnt really tell us anything. i am not really sure how i should make this. could someone help me out? i have styrofoam balls and a posterboard but i dont know how to make it with a posterboard, so i was just gunna make a model and not put it on the poster board, but i dont know how to go about this. i dont knwo what wire to use and i dont know if i should paint it and i dont know how to hold it together and i dont really know anything. if you could give me any help i would appreciate it, it would be nice to see some examples of either yours or just of models you found online, and a website on how to build it would be great too. please and thanks.

2006-10-10 13:10:29 · 1 answers · asked by um yea hi 4

2006-10-10 13:07:42 · 7 answers · asked by Anonymous

A) high P, high T, high n
B) low P, low T, low n
C) high P, low T, high n
D) low P, high T, high n
E) low P, high T, low n

2006-10-10 12:51:37 · 4 answers · asked by SQY 1

2006-10-10 12:36:31 · 4 answers · asked by hello 1

A)what does the ionization energy quantitatively measure about an atom?
B)why do ionization energies decrease from the top to the bottom of the group on the periodic table of elements?
C)why do ionization energies increase from left to right across any period?

i have absolutely no idea, i cant find it in my note

2006-10-10 12:26:21 · 3 answers · asked by um yea hi 4

2006-10-10 12:18:05 · 5 answers · asked by hello 1

im not sure i know the answer to this
i think that it is because calcium has one more valence electron than potassium, but i really just guessed....help?

2006-10-10 12:17:52 · 5 answers · asked by um yea hi 4

2006-10-10 12:17:24 · 2 answers · asked by Randy D 1

2006-10-10 11:58:25 · 10 answers · asked by Red Eye 2

?????

2006-10-10 11:44:24 · 5 answers · asked by um yea hi 4

2006-10-10 11:41:05 · 5 answers · asked by fadetopink 2

i have no idea please help

2006-10-10 11:36:06 · 4 answers · asked by um yea hi 4

I'm doing a report on him, and would like any information you have and would like to share. Thanks.

2006-10-10 11:28:53 · 2 answers · asked by grantacious999 2

2006-10-10 11:18:13 · 8 answers · asked by Apoc 3

Water at 50 degrees Celsius has a density of 0.98804g/mL. Which correctly expresses the mass of 12.3L of water?
a.) 1227.59 kg
b.) 1.226 kg
c.) 12.2 kg
d.) 1.22759 x 10^3 g

2006-10-10 11:16:45 · 3 answers · asked by killsyche 3

2006-10-10 11:14:00 · 3 answers · asked by Anonymous

2006-10-10 11:12:45 · 2 answers · asked by ruben j 1

2006-10-10 11:11:11 · 12 answers · asked by donald w 1

H2SO4 + 2NaOH -> Na2SO4 + 2H2O

Help!
How to I even begin to solve this?!

2006-10-10 10:45:09 · 4 answers · asked by megan6288 1

By "where does it come from" I mean "what is the origine of this gas"...

2006-10-10 10:33:27 · 5 answers · asked by Alexis (From France) 1

2006-10-10 10:30:53 · 2 answers · asked by Daisy 2

I am studying Forensic science and we are using these equations to identify reactants to 2.46Kg Aluminium Oxide and how much reactants was used to create an explosive. This would enable us to check with stores for possible suspects.

2006-10-10 10:24:41 · 4 answers · asked by Dominic R 1

If density of a gas is 1.2 g/L at 0.98026 atm and 293 L, what is the molecular mass ?

I solved this using MW = (mRT)/PV and got 29.44 g. is this correct? MW is molecular weight and m comes from n (moles)= m (mass)/MW (molecular weight.)
plz help! THANKS!

2006-10-10 09:54:41 · 4 answers · asked by Anonymous

can u tell me the uses of the element mercury and what QUALITIES of mercury(element) make it USEFUL for this purpose?

PLEASE ANSWER THIS QUESTION..THANKS ALOT!

2006-10-10 09:45:18 · 4 answers · asked by Hey! 1

I need help understanding electron configurations and electron configuration tables. The electron configuration for tin(Sn) is:
Sn: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p2

(The number after the letter is the number of electrons if you didn't know)
I am confused because the E.C. table has sublevel f. why did the configuration go from 4d10 to 5s2? It skipped the f sublevel. Why is that?
THanx 4 ur help!

2006-10-10 09:31:06 · 5 answers · asked by i ♥ music! 2

This uses the ideal gas law:
An elemental gas has a mass of 10.3 g. If the volume is 58.4 L and the pressure is 0.997368 atm at 275.5 K, what is the gas?

2006-10-10 09:29:37 · 4 answers · asked by Anonymous

2006-10-10 09:15:54 · 4 answers · asked by gm_santayana 2

1.0526 atm and 298 K?



AND if the density of a gas is 1.2 g/L at 0.98 atm and 293 K, what is its molecular mass?


formula is PV=nRT R = 0.0821

i dont understand how to figure this out.
THANKS!

2006-10-10 09:08:26 · 1 answers · asked by Anonymous