Chemistry - February 2007

What are some examples of mixtures

2007-02-28 10:01:05 · 4 answers · asked by Anonymous

2007-02-28 10:00:26 · 1 answers · asked by Anonymous

When sodium and chlorine react to produce sodium chloride and heat, the product, sodium chloride, will be at a higher potential energy than the reactants. T/F?

2007-02-28 09:58:50 · 4 answers · asked by Jess 2

2007-02-28 09:55:55 · 1 answers · asked by Gee Whizdom™ 5

Look im a freshman and i want to know this.....When i become a senior i want to take pre-med but the thing is it requires these coarses to be done
General Chemistry 1 & 2 (with laboratories)
General Biology 1 & 2 (with laboratories)
Organic Chemistry 1 & 2 (with laboratories)
General Physics 1 & 2 (with laboratories)
Calculus 1 & 2
English and Writing

But the thing is im taking living enviroment right now and my teacher says i will be in chemistry honors next year....but i want to know when will i take Biology and physics?

2007-02-28 09:38:13 · 1 answers · asked by bob 1

2007-02-28 09:37:17 · 1 answers · asked by Report Abuse 2

Ammonium carbamate (NH2COONH4) (MM=78 g/mol) is found in the blood and urine of mammals. At a temperature of 504 K, Kc = 0.027 for the following equilibrium:
NH2COONH4(s) <=> 2 NH3(g) + CO2(g).
If 10.2 g of ammonium carbamate is introduced into a 0.500 L container, what is the total pressure inside the container at equilibrium?

Correct answer: 23.46

How would I go about doing this?

I'm pretty sure I'm doing it right, but I keep getting the wrong answer.

The equation to solve x, that I get, is 4x^3 + .027X=.00705
.......

2007-02-28 09:30:29 · 2 answers · asked by other_user 2

2007-02-28 09:26:14 · 5 answers · asked by Anonymous

Chemistry homework on matter and the textbook doesn't elaborate much on that.

2007-02-28 09:25:18 · 2 answers · asked by 12Grey14 4

What are some occupations that involve Chemistry (other than a chemist). If you can list as many as possible, that would be great. Thanks.

2007-02-28 09:23:52 · 3 answers · asked by Anonymous

A_________ is an atom or group of atoms that carries an electric charge because it has gained or lost electrons.


A ______ is a substance that conducts an electric current when dissolved in water or melted.

- I have a guesse on this one^ Mercy?

An arrangement of valence electrons like that fond in helium, argon, neon, and similar elements is known as a __________.

The forces between the particles of a substance are called __________.

2007-02-28 09:22:14 · 11 answers · asked by Anonymous

Please tell me how to do these?
How many moles of gaseous arsine (AsH3) occupy 0.601 L at STP?
mol
What is the density of gaseous arsine?
g/L

2007-02-28 09:21:59 · 5 answers · asked by ? 2

Given the following substances in order of increasing acid strength:
HOCl(aq) < HC2H3O2(aq) < HC2O4–(aq) < HOCN(aq) < HNO2(aq) < HCl(aq)
Which one of the species in the set listed below is the strongest base of that set?(- means minus)


Cl-(aq)


OCl–(aq)


NO2–(aq)


H2C2O4(aq)


OCN–(aq)

2007-02-28 09:20:20 · 3 answers · asked by Ryan C 1

a) ClCCH


b) CO32-


c) NO2-


d) BrF3


e) C2H6O

2007-02-28 09:20:15 · 1 answers · asked by Anonymous

Consider the gas-phase reaction, Cl2(g) + Br2(g) <=> 2 BrCl(g), for which Kp = 32 at 500 K. If the mixture is analyzed and found to contain 0.8 bar of Cl2, 0.6 bar of Br2 and 3.9 bar of BrCl, describe the situation:


Correct description:
Q < K and more products will be made to reach equilibrium.


How does that make sense!? Shouldn't it proceed in the reverse direction, since there is an excess of products?

2007-02-28 09:15:29 · 2 answers · asked by other_user 2

I need to neutralize un unknown quantity of sulfuric acid, such that it will be safe to discard (in the safety guru's opinion). Please tell me several ways to do this, or give a hyperlink if you know a good site with this information.

2007-02-28 09:13:14 · 2 answers · asked by Anonymous

2007-02-28 09:12:19 · 4 answers · asked by Michelle G 1

A_______metal is one that can drawn into wires.

A metal that can be hammered or rolled into this sheets is said to be _________.

A molecule in whihc there is an unequal distribuation of electrical chardes is called a _________.

2007-02-28 09:09:59 · 8 answers · asked by Anonymous

2007-02-28 09:06:13 · 3 answers · asked by digby 1

2007-02-28 08:58:24 · 6 answers · asked by Michael M 1

Im wondering how/why/what could cause a liquid to remain after hydrolysis of H2o water? Is there a certain machine or method to a hydrolysis reaction so that "some" oxygen is made, but a liquid still remains, without any loss to the hydrogen side of things? Would any impurities in tapwater effect this process to my liking, such as chlorine, iron, magnesium...?

Ive seen an apparatus setup that changes water to another form, and looked like a hydrolysis machine, but carbon was in the liquid afterwards, which makes it not completely water any more. what could be happening?

2007-02-28 08:50:04 · 2 answers · asked by Anonymous

a)sodium carbonate decahydrate, Na2CO3 X 10H2O
b) nickel (II) iodide hexahydrate, Nil2 X 6H2O
c)ammonium hexacyanoferrate (III) trihydrate, (NH4)2Fe(CN)6 x 3H2O
d)aluminum bromide hexahydrate

2007-02-28 08:37:23 · 4 answers · asked by Lore 1

a)bromine in 50.0g of potassium bromide, KBr
b)chromium in 1.00 Kg of sodium dichromate, Na2Cr2O7
c)nitrogen in 85.0g of the amino acid lysine, C6H14N2O2
d)cobalt in 2.84g of cobalt (II) acetate, Co(C2H3O2)2

2007-02-28 08:33:43 · 1 answers · asked by Lore 1

a)sodium oxalate-Na2C2O4
b)ethanol-C2H5OH
c)aluminum oxide-Al2O3
d)potassium sulfate-K2SO4

it'll be nice if u help me to do this... =]
it doesnt matter if u dont give me the answer ((IT'LL BE NICE))
but explain it also please?

2007-02-28 08:28:32 · 2 answers · asked by Lore 1

John Dalton's Atomic theory and Niels Bohr's Atomic Theory

2007-02-28 08:10:04 · 3 answers · asked by metal_enchantment 2

2007-02-28 07:41:23 · 2 answers · asked by hd 1

2007-02-28 07:36:17 · 1 answers · asked by ..... 1

Ok, Teach says we have to set up a buffer. We are to calculate one that is ± 1 pH from our target pH. We are selecting the target pH and reaction. We are to describe the reaction, calculate it's pH, find pKa from an outside source, and find a suitable buffer via the Henderson-Hasselbach equation: pH = pKa + log (H/HA).

The hard part? I have no idea what to do or how to start. The prof was really vague as to how we are to set it up, which is why I am confused. I will ask him for details, but if anyone has any experience with this, it would help. Would be nice to have a breakdown of the process for selecting a buffer. Sorry if I asked a vague question. I have only a vague assignment to work with. I will pin him down today and get the exact details.

2007-02-28 07:18:54 · 3 answers · asked by frenzee2000 3

2007-02-28 06:27:17 · 2 answers · asked by Anonymous

What most likely occured?
A.the Gold bromide released light&energy, but remained unchanged.
B. The heat caused the gold bromide to form a new compound
C. The gold bromide decomposed into bromine and gold.
D.the gold bromide reacted with the test tube to form a new element.

2007-02-28 06:25:11 · 1 answers · asked by ladona c 1