Chemistry - September 2007

Describe what happens to an stom when each of the following subatomic particles in increased and indicate what new property emerges:

protons
nuetrons
electrons

2007-09-03 12:53:26 · 1 answers · asked by Sarah M 2

That is the question I have for part of a chemistry lab, but here are the specifics on what exactly I'm talking about.

We dissolved a silver-copper alloy in nitric acid (HNO3) and added salt (NaCl) so that the silver from the alloy would form a silver chloride precipitate. The point of the lab was to filter this silver chloride precipitate out of the solution so we could find its mass, and then calculate how much silver was in the original alloy.

The question is, why couldn't we have only used hydrochloric acid (HCl) instead to dissolve the alloy and precipitate the silver? Would the alloy still dissolve in the hydrochloric acid so that only an AgCl precipitate forms?

2007-09-03 11:57:31 · 2 answers · asked by Anonymous

2007-09-03 11:12:23 · 1 answers · asked by jkgregory10@sbcglobal.net 1

1.Oxygen gas changes to ozone during thunderstorms.
2.Freezing rain develops when a warm air mass overrides a cold air mass.
3.Carbon dioxide is produced by the combustion of gasoline in an automobile engine.
4.Fog forms from water vapor when the temperature drops below the dew point.
5.Solid waste decomposes in landfills and produces methane gas.

2007-09-03 11:06:04 · 3 answers · asked by Cynthia P 1

Do you know the answer?

2007-09-03 11:02:23 · 2 answers · asked by jon st. germain 1

To make a buffer, you have to make it so the pKa of your weak acid is going to equal the pH right? (50 % dissociation)
My questions are:
(1) How do you do this....can you just put a solution of your weak acid into an already existing solution that has a pH close to that of your weak acid's pKa?
(2) If so, how does the mixing work, stoiciometrically? Like let's say, you want to mix 1 liter of 0.1 M of your weak acid into an already existing solution with a pH you want. (I'm thinking about this kind of in terms of biochemistry, like when somethng acidic enters a cell, rather than traditional methods of making buffers, as by titrating). Can you give me an example? using math, numbers, etc?
Because I'm thinking, if realistically, you add 1 L of your weak acid solution, to another liter of another solution, you'll have 2 liters. Wouldn't that change concentrations of either solution, or the buffer...if you made one? So this is where I'm confused, and need example

2007-09-03 10:54:07 · 1 answers · asked by Anonymous

A hot dog bun (volume 240 cm3) with a density of 0.15 g/cm3 is crushed in a picnic cooler into a volume of 195 cm3.what is the new density of the bun?

2007-09-03 10:30:24 · 2 answers · asked by Anonymous

please list resource. Thanks!

2007-09-03 09:49:30 · 2 answers · asked by jamet002 2

So, AP Chem. is hell.

Let's say you had to draw 2-methyl-3-octene

where would you place the "H" and the "="

gah, I wish I can draw on here.

I already have the following::

H-C-C-C-C-C-C-C-C-H

where would you place the methyl, equal sign, and the other hydrogen bonds?

2007-09-03 09:41:09 · 2 answers · asked by Anonymous

what does fluorine look like in...
its pure form and its natural form?

what is pure form and natural form anyway?

2007-09-03 09:29:23 · 7 answers · asked by Anonymous

its for my science class

2007-09-03 09:23:04 · 11 answers · asked by Anonymous

2007-09-03 09:17:59 · 3 answers · asked by jacksjarofdirt 1

Hello~
For my AP chemistry class, we did a lab practical where we used KH2PO4 and K2HPO4. That question that I need answered is, "why are these compounds labeled monobasic and dibasic"?
Is it simply because of the amount of hydrogen atoms in its moelcules? So would the KH2PO4 would be the dibasic while the K2HPO4 would be the monobasic? Is that all I need to say to completely answer the question?
Thank you very much in advance!

2007-09-03 09:14:45 · 2 answers · asked by she*wished 2

2007-09-03 09:14:12 · 1 answers · asked by Anonymous

Write an equation for the quantitative relationship between H+ and OH- in aqueous solutions.

2007-09-03 09:09:33 · 2 answers · asked by Anonymous

Im so lost, because I understand what a ratio is but I dont know what it means when they say that oxegen is in a 8.0:1 mass ratio with hydrogen. I think that means for every gram of hydrogen there is 8 grams of oxegen.

My textbook said that with this information we can conclude that with the h2o formula that oxegen atoms are in fact 16 (not 8) not times heavier than hydrogen.

I dont get it. I understand that for every gram of H there has to be 8 O. So with 2 grams of H there are 16 grams of O.

But how can oxegen be sixteen times one hydrogen atom when the ratio is 8:1? Shouldnt it oxegen only be 8 times the hydrogen.

2007-09-03 08:40:43 · 4 answers · asked by Anonymous

describe the safe way to deal with each of these items:long hair,jewelry,,contact lenses,cosmetics,food.

2007-09-03 08:38:42 · 1 answers · asked by NICE G 1

2007-09-03 08:15:59 · 2 answers · asked by techie_101 2

I am having a few problems with this question. Can someone please help? I am getting C10 H22. Is this right. Oh how I hate math. The other annswers areCH3 Ch2 Oh, Naci, NH3 or H20.

2007-09-03 07:57:30 · 1 answers · asked by Anonymous

what is the safe way to draw liquids into a pipette?

2007-09-03 07:48:11 · 1 answers · asked by NICE G 1

Calculate the celius temperture change between the melting point of ice and the boiling point of water?

water boils: 93
ice completely melts: 18

2007-09-03 05:09:18 · 5 answers · asked by Anonymous

2007-09-03 04:55:41 · 27 answers · asked by Anonymous

How much HCl is produced from the reaction of an excess of HSbCl4 with 3 moles H2S in this reaction? ( balance reaction first)
HSbCl4 + H2S ---> Sb2S3 + HCl

2007-09-03 04:34:05 · 2 answers · asked by Anonymous

Limestone (CaCOsubscript3) is decomposed by heating to quicklime (CaO) and carbon dioxide. Calculate how many grams of quicklime can be produced from 4.0 kg of limestone.

2007-09-03 04:33:46 · 1 answers · asked by Anonymous

the density of water is 1.00 g/mL at 4 degrees C. How many water molecules are present in 5 mL of water at this temperature?

2007-09-03 04:31:01 · 1 answers · asked by Anonymous

1how can you reduce the risk of spills when pouring liquid chemicals?

2why is it important to read labels before mixing chemicals?

3describe the safe way to mix water with acid.

2007-09-03 04:29:46 · 1 answers · asked by Anonymous

ANy suggestions or websites would be grealty appericated...A cube neasures 35.5 on a side. It weighs 125 grams. Calcualte the volume for the cube. Units signficant digits?? I think this cube is 35.5 on each side.. What is the density of the cube? Units significant digts? IF this cube is aluminum. The accepted density for aluminum is 2.7 Calculate the % error?

2007-09-03 03:56:30 · 1 answers · asked by Steven V 2

2007-09-03 03:44:06 · 3 answers · asked by heena 2

2007-09-03 03:32:53 · 4 answers · asked by Anonymous

I need help with these chemical reactions. If you can tell the tyep of reaction, predict the products, and write a balanced equation

1. Ammonium sulfate reacts with barium nitrate
2. Zinc metal is added to a solution of copper (II) chloride
3. Propane gas (C3H8) is burned in excess oxygen
4. Dinitrogen pentoxide gas is added to distilled water

2007-09-03 03:04:41 · 1 answers · asked by dylson20 1