Chemistry - September 2007

Perceived color is from the fact that an object absorbs and reflects color. If an object is red, will it fade from the sunlight faster than an object that is blue? Because a red object has to absorb the higher frequency blue, and the blue color absorbs the low frequency color red? The rays will break the chemical bonds of the dye and cause it to fade.

2007-09-16 12:22:10 · 1 answers · asked by Anonymous

-Periodic Table

2007-09-16 11:29:51 · 3 answers · asked by tankaboy91 1

I know they were arranged first by atomic mass and then later atomic numbers, but why couldn't they first arrange it base on colour, state and taste of the elements? Was it because it was too different and consist of no similarities?

2007-09-16 11:24:57 · 10 answers · asked by Annoymous 1

2007-09-16 10:47:03 · 5 answers · asked by Tridon 1

2007-09-16 10:23:01 · 1 answers · asked by Average Joes 4

(a) 0.1 M HONH2 (Kb = 1.1 * 10-8)
(b) A mixture containing 0.1 M HONH2 and 0.1 M HONH3Cl

Please can you explain each step. I would be greatly appreciated

2007-09-16 10:20:15 · 1 answers · asked by uberifrit 2

whicch is more denser, hot or cold water...why?

2007-09-16 10:17:39 · 3 answers · asked by BIOBOY 1

(C subscript 6 H subscript 12 O subscrip 6).

2007-09-16 10:15:24 · 2 answers · asked by Anonymous

what is the maxium mass of CO2 that can be produced by the cumbustion of _____g of ethonal how do you do this problem?

2007-09-16 09:42:00 · 2 answers · asked by Anonymous

2007-09-16 09:11:53 · 2 answers · asked by princesstinachan 1

2007-09-16 09:01:09 · 1 answers · asked by Anonymous

2007-09-16 08:56:56 · 1 answers · asked by Anonymous

Please explain your answer

2007-09-16 08:06:00 · 4 answers · asked by shiny 1

2007-09-16 07:11:18 · 2 answers · asked by Anonymous

2007-09-16 06:42:06 · 6 answers · asked by Anonymous

2007-09-16 06:38:45 · 8 answers · asked by pHiLlY 1

PLeASe HeLP ANSWeR THeSe CHeM QUeSTIONS??

1.CaO (s) + H2O(l) = Ca2+ (aq) + 2OH –(aq)

(i)If the pH of this solution were tested, state whether it would be below or above pH 7, or equal to pH 7.
(ii)Give a reason for your answer to (i) above.

2. Write a balanced equation to show what happens when solid calcium carbonate is heated.

Thanks Muchly!!!

2007-09-16 06:37:07 · 1 answers · asked by Jessa 2

2.72 g of MgCl2 is equal to how many moles?

2007-09-16 06:32:35 · 1 answers · asked by bebo m 1

If you know how an element behaves and what it looks like does that tell you anything about how a compound containing that element looks or behaves?

2007-09-16 06:30:14 · 2 answers · asked by melissa c 2

I think it's found in red and brown dyes, but I'm not sure.

Any help is appreciated, thanks!

2007-09-16 06:25:18 · 7 answers · asked by Ally 3

Q 1.
Compound of copper and sulfur contains 88.39 of metal and 44.61 nonmetal. How many grams of Copper are in 5264kg of compund? How many grams of sulfur?

Q 2.
Dolomite is a carbonate of magnesium and calcium. Analysis shows that7.81 g of dolomite contain 1.70g of Ca.Calculate the mass percent of Ca in dolomite. On the basis of the mass percent of Ca, and neglecting all the other factors, which is the richer sourse of Ca, dolomite or fluorite?
*Fluorite, a mineral of Ca , is a compound of the metal with fluorine. Analysis shows that a 2.76g of fluorite contains 1.42g of Ca.

ANYTHING YOU KNOW MIGHT HELP so say it xD? Thanks

2007-09-16 05:51:37 · 2 answers · asked by Banna_skillz 2

a post-operative patient is to receive 300 mg of intravenous (IV) antibiotic every 4.00 hours. A 1.00 liter bag of IV solution contains 500mg of antibiotic. what drop rate (in drops per second) of IV solution is required for the patient to receive the correct dosage of antibiotic? (20 drops = 1ml)

2007-09-16 05:39:13 · 4 answers · asked by Koala J 1

a. NaCN
b. FeCl3
c. Na2SO4
d. K2CO3
e. Cu(OH)2
f. LiNO3

How do I find the answers. Explain how letter b is Iron(III)chloride. What do I do for ones like c and d with all of the numbers?

2007-09-16 05:02:39 · 4 answers · asked by Average Joes 4

a. MnO2
b. Li3N
c. CaCl2
d. SrBr2
e. NiCl2
f. K2S
g. CuCl2

Could you please explain how I can find the answers to these problems. I just don't understand how to write it out.

2007-09-16 04:38:33 · 1 answers · asked by Average Joes 4

1. Na Cl + Au (No-3) > Na(No-3) + Au Cl

2. Au (No-3) + KI> Au I + K (No-3)


3.Fe (III) (No-3 ) + Na (OH-) > Fe (III) (OH-) + Na (No-3 )

4. Na Cl + K (No-3) > Na (No-3) + K Cl

5. Na CO3 + Ca Cl > Na4 Cl + Ca CO3

2007-09-16 03:39:32 · 1 answers · asked by shygirl 1

2007-09-16 02:55:51 · 5 answers · asked by Anonymous

2007-09-16 02:41:14 · 2 answers · asked by Denise 1

2007-09-16 02:40:15 · 1 answers · asked by frack_eyla 1

2007-09-16 02:29:25 · 5 answers · asked by Denise 1

If anyone could help me with this I'd appreciate it. I'm studying for a test and cannot find the answer for this in my notes or in the text.

2007-09-16 02:21:36 · 3 answers · asked by jennie b 3