Chemistry - February 2007

what do i need to know about them.

2007-02-25 10:47:13 · 2 answers · asked by Koko Butta Kream 4

Consider the flask apparatus in the following diagram, which contains 2.00 L of H2 at a pressure of 360. torr and 1.00 L of N2 at an unknown pressure. If the total pressure in the flasks is 341 torr after the stopcock is opened, determine the initial pressure of N2 in the 1.00 L flask.

Apparatus looks something like 2 circle bulbs joined by one tube. The H2 and N2 gas are separated by a stopcock (located at the tube)

2007-02-25 10:32:36 · 1 answers · asked by Student_007 1

I did a science fair experiment where i extracted the iron from cereal. I took different kinds of cereals, put them with water in a blender, and then mixed it. This produces a kind of goop that I swirl a magnet around in. When the magnet comes up it will have a certain amount of iron on it. I then compare that iron on that magnet to the iron content the cereal is supposed to have, (I.E 25% of your daily needs) and then compare that to other cereals and what they say they have. For example, if Total has 100% of your daily iron, and Lucky Charms has 25% of your daily iron, I would expect to see ¼ of the iron on the Lucky charms magnet that I see on the Total magnet. But frosted flakes produced no iron even though it has the standard 25% iron. I was wondering if sugar somehow binds the iron to the sugar or corn mean or something else so that i cant take it out.

2007-02-25 10:31:21 · 1 answers · asked by ironman00@sbcglobal.net 1

I need to do this for a class but I forgot how todo it on my calculator... I was just wondering if anyone knew? or knew how to calculate it?

2007-02-25 10:27:04 · 3 answers · asked by Ashlee 3

2007-02-25 10:23:25 · 3 answers · asked by 2good4me22 3

?

2007-02-25 10:22:38 · 4 answers · asked by Anonymous

What is the name for a gas turning DIRECTLY into a solid. This is an extra credit assignment that i have for science. You know how there is percipitaion ect. well i need to know the name for a gas turning DIRECTLY into a solid. Thanks!

2007-02-25 10:13:47 · 2 answers · asked by Anonymous

2007-02-25 10:04:06 · 2 answers · asked by Anonymous

What does it mean to say a physical quantity is conserved? Why is this idea useful?

2007-02-25 10:03:34 · 1 answers · asked by angelgirl 2

?

2007-02-25 09:59:21 · 1 answers · asked by Anonymous

2007-02-25 09:56:44 · 2 answers · asked by tiff-fee-uh-nee. x_X 2

I know that carboxylic acids and amine functional groups readily ionize by adjusting their pH, but there's a third one, can anyone help me out? Please? Thanks in advance!

2007-02-25 09:53:12 · 2 answers · asked by asdfk23 1

2007-02-25 09:51:35 · 21 answers · asked by sxe 1

a. a set of instructions that directs a computer
b. a disc on which information is written and read by lasers
c an output divice
d an input device

2007-02-25 09:47:06 · 11 answers · asked by sxe 1

ok this is a combustion problem., i know u add O2 when something burns ^^ anybody care to explain how to balance equations?!

2007-02-25 09:36:20 · 3 answers · asked by kitty~princess 1

ok people., double replacement reactions., can anybody clearify this? i dont get balencing equations.

2007-02-25 09:34:50 · 1 answers · asked by kitty~princess 1

For the reaction whose reactants and products are:



reactants: Fe2O3 (s) CO (g)


products: Fe(s) CO2 (g)



calculate the standard entropy change (J/mol-K).

The answer depends on how you balance the equation. For this question balance the equation using the smallest ratio of WHOLE numbers.

Enter a numeric answer only

2007-02-25 09:23:42 · 1 answers · asked by Anonymous

does anyone know the answers to these questions? ive spent all day trying to figure them out and i cant. thanks!!

what is conserved in the reaction shown here: H sub 2 (g) +Cl sub 2 (g)--> 2HCl (g)

what is conserved in the reaction shown here: N sub 2 (g) + 3F sub 2 (g)--> 2NF sub 3 (g)

in the reaction 2CO(g) + O sub 2 (g)-->2CO sub 2 (g), what is the ratio of moles of oxygen used to moles of CO sub 2 produced?

2007-02-25 09:05:41 · 2 answers · asked by kittylover61891 2

How do you change the volumes of gases from the conditions given to the new conditions (assuming that the temperature and amount of gas is constant)?

For example, 1.15 x 10^3 cm3 at 75.2 kPa to 14.0 kPa?

2007-02-25 08:54:24 · 4 answers · asked by !!! 3

For sci project
I also need in this slogan is one or two of its uses.
Thx

2007-02-25 08:52:56 · 5 answers · asked by sanandreas189 1

To do this, .10 ml of a saline suspension of red blood cells labeled with 59over26 Fe is injected into the tail vein. Before injection the gamma rays were counted for this .10 mL solution and the count rate was found to be 1.0x10^-4 cpm. After a sufficient time for the blood to be thoroughly mixed, .10 ml of blood is removed and counted. the sample is found to have a count rate of 476 cpm. what is the approximate blood volume in mL in the mouse.

please provide explanation. im kind of confused on this problem

2007-02-25 08:19:17 · 1 answers · asked by galdon885 1

C6H12O6(s) + O2(g) --> CO2(g) + H2O (g)

and

H2S(g) + SO2(g) --> H2O(g) + S(s)

and

C2H2(g) + --> CO2(g) + H2O(g)

2007-02-25 08:18:40 · 4 answers · asked by cb450t 3

A. 93 yrs
B. 9 half lives
C. 4.3 yrs
D. 5.7x10^-3 years
E.none of the above

please explain

2007-02-25 08:09:38 · 2 answers · asked by galdon885 1

2007-02-25 08:09:37 · 1 answers · asked by Anonymous

1. When calcium bromide reacts with chlorine, bromine and calcium chloride are produced. what is the equation that describes this reaction?

2. A _______ reaction takes place when two reactants exchange ions to form two new compounds.
a. single-replacement
b. double-replacement

3.A solid formed in a solution as a result of a chemical reaction is called ________

4. Breaking down waster through electrolysis requires an input of energy, This is an example of an ___________ reaction.

2007-02-25 08:06:41 · 1 answers · asked by jennifer 1

ISBN 0-07-088686-5

2007-02-25 07:56:05 · 2 answers · asked by sin90PRINCE 2

Lookin for somethin basicly simple.

2007-02-25 07:31:00 · 3 answers · asked by hubes 1

could you explain this thanks.

2007-02-25 07:15:44 · 9 answers · asked by Randy 1

which of the products is the precipitate?

2007-02-25 07:11:23 · 5 answers · asked by Anonymous

all i did was get the weight of oxygen and nitrogen, since thats what mostly is air...

dont trip on my question, it just sounded in my head like it was right... i duno though

2007-02-25 07:07:42 · 4 answers · asked by living_under_shadows 2