Chemistry - September 2007

Effects of CFC?

2007-09-06 06:20:30 · 6 answers · asked by Sam 1

I just recently had an AC installed in my kitchen window, which just happens to be right outside the bathroom door. It was suggested to me that I should keep the bathroom door shut when the AC is on, because the AC could suck the moisture out of the toilet.

2007-09-06 06:02:44 · 4 answers · asked by tramps3 3

Do phenols react with carboxylic acids to form esters? If not, then why not?Thanks!

2007-09-06 05:48:10 · 3 answers · asked by Muneeb 1

where in england can i buy this stuff for etching?

2007-09-06 05:38:26 · 4 answers · asked by olie b 1

What do the IO3 and SO3 stand for, in the instances of:
NaIO3, and Cs2SO3

2007-09-06 04:21:42 · 2 answers · asked by Matt S 2

2007-09-06 04:02:39 · 1 answers · asked by Anonymous

2007-09-06 01:50:03 · 3 answers · asked by el0hyim 1

2007-09-06 01:00:11 · 3 answers · asked by Anonymous

I have four crystaline solids, and I need a range of simple tests such as ph scale, flammability....to identify which are elements, compounds or mixtures.

2007-09-06 00:11:35 · 1 answers · asked by sciencecrack 1

how do i write the equation of this reaction? any help would be great!

2007-09-05 18:27:05 · 8 answers · asked by Anonymous

2007-09-05 17:47:27 · 1 answers · asked by Anonymous

Please give a detailed example on how to solve it. Math and reasons on how you solved it, thanks.

2007-09-05 17:33:47 · 3 answers · asked by Anonymous

ANSWER QUICKLY please =]

2007-09-05 17:24:30 · 10 answers · asked by lambofgod925 2

2007-09-05 17:17:17 · 2 answers · asked by Anonymous

including screening and macerating solids,,(teeth), seperating solids from liquids, (side streams in the body leading to liver, kidneys, bladder, etc..), and temperature (98.6 in both digesters and humans ), and PH balance similar in digesters and humans...finally waste effluent in the plant is chlorinated and transferred to receiving waters...In humans urine is sterile and is transferred back to the sewer...There are many more similarities, too many to recount here,,,such as bacterial oxidation of solids. Also when digesters in the plant get "upset" they are dosed with lime or alkalines to raise PH levels....any way, my question actually is, is this all coincidental, or did the first waste water engineers model the plant process directly from the human body???....anybody know??? thx. in advice for answer..

2007-09-05 17:13:20 · 2 answers · asked by Anonymous

Hi guys. I'm just having difficulty with this one problem. There were two, I answered the first one which was:

1. Calculate how much 95% ethyl alcohol will be required to dissolve 0.3g of sulfanilamide at 78 ' C.

I got 300 mg sulfanilamide ( 1ml / 210mg SAmide) = 1.42867143ml.

Now it is asking:

2. Using the volume of solvent calculated in Step 1, calculate how much sulfanilamide will remain dissolved in the mother liquor after the mixture is cooled to 0 ' C.

I know the solubility of sulfanilamide at 0 ' C is 14 mg/ml but I don't know where to go after this. Please help me understand this problem! Any help will be much appreciated. We are doing a Semimicroscale Crystallization lab using Erlenmeyer Flasks and a Hirsch Funnel. Thank you all in advance!

2007-09-05 17:10:27 · 4 answers · asked by Anonymous

2007-09-05 16:54:19 · 4 answers · asked by Shiroi Nozomi 1

You have a 200.0 mL graduated cylinder containing 56.9 mL of water. A piece of metal with a density of 9.30 g/cm3 weighing 190.90 g is placed in the cylinder. What is the reading on the cylinder after the metal has been added? Enter your answer with the correct number of significant figures.

2007-09-05 16:39:59 · 3 answers · asked by bloooper28 1

atom is becuase the total negative charge of all its orbitals is greater than the total charge of almost all other elements. ((While reactions are either a matter of gaining electrons or losing electrons, oxygen's strong charge causes it to accept or share electrons and therefore giving it a stong affinity for covalent bonds.))

Thanks,

Lisa

2007-09-05 16:38:04 · 2 answers · asked by Lisa 1

I was wondering since ketone is a carbon double bonded to an oxygen and 2 R-groups.... When one of the R-group appear to be hydrogen, the whole thing becomes aldehyde....so can you say aldehyde is also a ketone?

2007-09-05 16:32:52 · 5 answers · asked by edbiology 1

2007-09-05 16:17:05 · 2 answers · asked by Addi R 1

2007-09-05 16:14:32 · 2 answers · asked by lostbutfound666 1

Preferably something cheap......but anything goes.

2007-09-05 16:07:32 · 9 answers · asked by Susie 6

we cleaned a penny, and put it in a sodium hydroxide-zinc mixture over a bunsen burner. it turned silver. then we took it out, and just held it over the flame with tongs, and it turned gold.
Here are some questions i have:

1. did the copper change to gold? explain. (i put no, and my reasoning was "you told us it wasn't"...i didn't actually know)
2. what intensive property could be used to prove your explanation? (i dont know this either)
3. list 1 extensive and 1 intensive property of the token
4. the last change formed an alloy, was the last change physical or chemical?
5. did the last change form a compound, mixture, or new element?
6. what was the final product? ( i think its brass but idk)

i need help figuring these out, but i would like a good explanation so im actually learning something

2007-09-05 15:40:44 · 3 answers · asked by lambofgod925 2

In addition, are boiling chips supposed to dissolve? And what could have caused it to dissolve? Will it affect the result?

2007-09-05 14:56:28 · 1 answers · asked by thisipromisey0u 1

"The Net" is a purple alloy with silverish striations, i think it is copper and iron but it might also be antimony. if you know what metals to use, the ratio and the temperature let me know. Ya kind of obscure but gotta start somewhere.

2007-09-05 14:08:13 · 2 answers · asked by gleipnir76 2

I have homework where I have to find the name of the element, the atomic number, the mass number, the # of protons, nuetrons and electrons.
So I found a site that helped me with the first easy ones. But then my teacher added some more difficult ones that I don't understand. Here they are:
F-
Cl-
Na+
K+
Mg+2
Ca+2

So my questions are, do these elements have the same atomic number, and mass number? Do these elements have the same # of protons and neutrons?

From what I read on this sight, the plus sign means that this is a positively charged ion. It is positively charged because a negatively charged electron was removed from the atom. So I just want to know if I am correct in saying that Fl- has an atomic number of 9, a mass number of 19 and protons = 9 and neutrons = 10 and electrons =10?
For a negative sign am I just adding one onto the electrons and not changing any other numbers? And for the postive sign am I just subtracting one from the # of electrons??

2007-09-05 14:00:29 · 2 answers · asked by Mother of 5/Madre de 5 3

A 1.1058g sample of seashell was reacted with 25.00 ml of 1.000M HCl. The excess HCl required 21.70 ml of 0.1590M NaOH for neutralization.

1. Why are the eggshells dried before they are massed?

2. Why are the eggshells crushed before they are used in the reaction?

3. As the mass of the eggshell sample increases, what will happen to the volume of NaOH solution required for the titration? Explain.


if you have any idea what the answer is, pleaseee help me! thanks!

2007-09-05 13:52:15 · 4 answers · asked by Maddi J 2

How do you figure out if it will most likely form bonds just by knowing its atomic number?

2007-09-05 13:50:49 · 5 answers · asked by Anonymous

Which radiation has the lowest energy?

2007-09-05 13:47:34 · 3 answers · asked by Anonymous