Chemistry - February 2007

1.Use an analogy to explain difference between a continuous change and a quantized change.
2. Also, what are some examples of photoelectric cells?
Thanks

2007-02-05 12:18:28 · 1 answers · asked by RickySingh2006 2

2007-02-05 12:17:56 · 2 answers · asked by soccer_girl1208 1

I have to compleate and balance these equations and I need help on how to do them...

Ca + H20 >>>>
ZnCO3 + H3PO4 >>>>
FeSO4 + (NH4)2S >>>>

Also I wanted to check if Cl2 + NaBr has no reation.
Thanks alot...

2007-02-05 12:12:24 · 2 answers · asked by Brandi 1

1.ionic
2.polyatomic
3.covalent
4.molecular

tell me about nameing too

2007-02-05 12:10:59 · 7 answers · asked by mike 1

Yes. I realize that this may be the most...well, 'stupidest' question I will ever ask. However, I have hit a road block. How do you balance this equation? It's driving me insane, because I know its easy and the answer is staring at me right in the face. Please, help me out! (Though, by the time anyone answers this, I'll have figured it out haha). Thanks for your help and consideration! :D

2007-02-05 12:05:13 · 4 answers · asked by Anonymous

2007-02-05 12:03:44 · 1 answers · asked by smllvillefan13 2

How many moles of carbonate ions, aluminum ions, and oxygen atoms are present in 29.0 g aluminum carbonate?
I really want to know how to do this! Don't just give me the answer!

2007-02-05 12:01:51 · 2 answers · asked by beachbum 2

Using : Fe2O3 + 2Al ---> 2Fe + Al2O3

How many grams of Al are needed to completly react with 135g Fe2O3?

How do i do this, i have no clue!

2007-02-05 11:57:15 · 4 answers · asked by Eddie G 1

I'm supposed to answer this simple q, why is tris buffer a 'good' buffer to use in a biomedical sciences laboratory

2007-02-05 11:53:55 · 1 answers · asked by jon 2

I would like to strip paint off an aluminum cover and make it rust without weakening it! Thanks!

2007-02-05 11:47:14 · 4 answers · asked by snak3s2001 3

The diameter of a certain atomic nucleus is 6.50x 10-5 pm and its mass is 9.40 x 10-25 g. What is the density of the nucleus in grams per centimeter cubed ? Assume the nucleus is a sphere with a volume equal to 4/3 P r 3

2007-02-05 11:40:55 · 2 answers · asked by jesica 1

1. If i'm asked to compare the numbers of metals, nonmetals, and metalloids in the periodic table...what im i suppose to be comparing?
2. wat are some of the properties of Lithium, beryllium, boron, Carbon, nitrogen, oxygen, fluorine and neon?
3. what arre some physical and chemical properties of: alkali metals, halogens, and noble gases?
4.what is the most likely chemcail formula for a compound of phosphorus and hydrogen that is also in demand in the chemical industry?

2007-02-05 11:38:06 · 2 answers · asked by no name 1

N = 5 Valence ELectrons
H = 1 valence electron
Cl = 7 Valence electrons

That adds up to 16 total valenence electrons


I get:
[H]
H-N -Cl-H
[H]

2007-02-05 11:24:29 · 4 answers · asked by Anonymous

and do you know if glucose (C6H12O6) is a binary compound or diatomic element? this is so confusing

2007-02-05 11:24:07 · 4 answers · asked by lilpinkbirdiechick 1

and do you know if glucose (C6H12O6) is a binary compound or diatomic element? this is so confusing

2007-02-05 11:13:47 · 2 answers · asked by lilpinkbirdiechick 1

plzzzz answer! Ok, i have this homework, so tell me, its about photosynthesis, i got the photo=light, but wut about the sysnthesis, wut does the synthesis mean??????????? answer as soon as possible!

2007-02-05 11:06:07 · 6 answers · asked by Rachel of the Cats 3

can someone please tell me the chemical make up of relaxers? thanks

2007-02-05 11:05:15 · 2 answers · asked by Anonymous

My friend has to do this homework that asks for the metal in table salt.

2007-02-05 10:55:30 · 6 answers · asked by Someone 1

calcium + water ---> _________ + ________
Ca + H20 ---> ________ + _________

2007-02-05 10:51:53 · 2 answers · asked by Meno 1

When will I ever use chemical reactions in real life, if my career doesn't involve science?

2007-02-05 10:49:48 · 2 answers · asked by ♥Me♥ 1

2007-02-05 10:45:00 · 2 answers · asked by ♥Roberta. 5

Determine the oxidation state of the elements in the compounds below:

a) Determine the oxidation state of I in KIO4
b) Determine the oxidation state of Fe in FeCl2
c) Determine the oxidation state of N in K3N

2007-02-05 10:42:16 · 1 answers · asked by beachbum 2

2007-02-05 10:33:15 · 3 answers · asked by Runa I 1

2007-02-05 10:30:50 · 6 answers · asked by Runa I 1

2007-02-05 10:24:00 · 2 answers · asked by yaya y 1

Okay,here is the dealio,i moved to a new school and i am really lost in science,i am afraid to ask the teacher for help and our next test is in 2 days.Can you please give me some help on how to balance chemicals,from the periodic table??

2007-02-05 10:19:54 · 3 answers · asked by **LoveYoo** 1

2007-02-05 10:18:50 · 5 answers · asked by l.m.s 2

A suggested mechanism for the reaction of nitrogen dioxide and fluorine is


Step I NO2 + F2 --> NO2F + F (slow)


Step II F + NO2 --> NO2F (fast)


Which of the following statements are true?



a) Step II is the rate determining step


b) For the rate determining step : rate = k[NO2][F2]


c) The overall reaction is 2NO2 + F2 --> 2NO2F


d) The experimental rate law is k[NO2][F2

2007-02-05 10:18:39 · 1 answers · asked by Anonymous

2007-02-05 10:17:43 · 5 answers · asked by Anonymous

energy+2NH3(g)<-->N2(g)+3H2(g)

what happens to the mole fraction of N2 as:
the pressure is increased
more H2 is added as container adjusted to maintain constant pressure?

for pressure increase, im thinking the mole fraction decreases??
im not sure!

2007-02-05 10:12:58 · 2 answers · asked by Sparkle 3