Chemistry - September 2007

Me and my class had an activity in Chem about elments involved in our environment. This question popped out and I have no idea what to write. Please help. TY

2007-09-13 09:33:11 · 35 answers · asked by Nayden 2

Consider a 1.50g mixture of magnesium nitrate (Mg(NO3)2) and magnesium chloride (MgCl2). After dissolving this mixture in water, 0.500 M silver nitrate (AgNO3) is added dropwise until precipitate formation is complete. The mass of the white precipitate formed is 0.641g.

a) Calculate the mass percent of the magnesium chloride in the mixture.

b) Determine the minimum volume of silver nitrate that must have been added to ensure complete formation of the precipitate.

2007-09-13 09:32:50 · 1 answers · asked by tay 3

It would be purely for decoration. Is it technologically possible? I have already contacted ABC about being on the show "America's Next Million-Dollar Idea."

2007-09-13 09:02:12 · 7 answers · asked by sid 2

DENSITY= MASS IN GRAMS/VOLUME

2007-09-13 09:01:16 · 3 answers · asked by heyletsgocoast 1

2007-09-13 08:45:52 · 2 answers · asked by heyletsgocoast 1

What is the theoretical yield (in g) of salicylic acid (assuming you start with 0.50g of methyl salicylate)? g

2007-09-13 08:14:57 · 2 answers · asked by michelle 2

2007-09-13 08:13:46 · 5 answers · asked by Abdullahi A 2

what does triethylamine look like after reacting with HCL, it IS soluble, and it does dissolve

2007-09-13 08:09:41 · 1 answers · asked by Anonymous

what does the structure of triethylamine look like when reacting with ether. it is soluble.

because the N in the triethylamine does NOT have a hydrogen attached to it, it just has 2 electrons, i dont understand how it reacts with ether? will it take a hydrogen molecule from one of the carbons in the ether?

PLEASE HELP

2007-09-13 08:01:50 · 1 answers · asked by Anonymous

Thanks

2007-09-13 07:53:40 · 2 answers · asked by Mark 1

Problem #1:
Aluminum oxide is formed from the reaction of metallic aluminum with oxygen gas. How many moles of Aluminum are needed to form 3.4 moles of Aluminum oxide?
Hint: This is a simple ratio problem. Just use the molar ratio from the balanced equation. This was covered in 5.09. Mass is not involved.

Problem #2:
Determine the number of grams of NH3 produced by the reaction of 3.5g of hydrogen gas with sufficient nitrogen gas. (Check for diatomic elements). Use the flowchart below for help.

Given quantity in grams--> change to moles----> multiply by ratio from balanced equation -----> convert wanted quantity from moles to grams.

2007-09-13 07:46:05 · 2 answers · asked by Anonymous

I need examples of pH, Biochemsitry, and Equilibrium in terms of chemistry

Thanks

2007-09-13 07:40:39 · 1 answers · asked by shawn s 2

benzoic acid, easy to look up what it looks like.
my question is... when benzoic acid reacts with naoh, it reacts with the oh, the oh takes the H from the oh thats attached to benzoic acid. NOW the NEW o that has 1 bond and 6 electrons around it, is attached to a carbon that is FULL, does it create a double bond and over fill the carbon, or does the molecule stay with a negative charge, i dont understand the rules for when a carbon can have an over full shell.
PLEASE HELPPPP

2007-09-13 07:40:09 · 2 answers · asked by Anonymous

2007-09-13 07:36:58 · 5 answers · asked by maxfashun911 1

the fiber in our diet is really__________.
where is glycogen stored in animals?
the sugar and phosphate group of nucleic acid make up the ______ of the molecule.

2007-09-13 07:25:01 · 2 answers · asked by Anonymous

1) 101.69 * 23.847

Also, how do I know what to put my answers in scientific notation? Let's just say that I get an answer that is something like 22.66 and the answer was supposed to have 4 significant figures. Do I need to put the answer in scientific notation or no?

Thanks for your help!

2007-09-13 07:21:07 · 2 answers · asked by sillyboys_trucksare4girls 2

If you want to test the solubility of NaCl in ethenol, which is less polar then water, what type of results would you expect?

2007-09-13 07:04:47 · 1 answers · asked by Craig x 1

NOT the definition for Inorganic chemistry or the definition for Inorganic compounds.

But just what does inorganic mean in chemsitry
And an example of "Inorganic"

2007-09-13 07:04:14 · 5 answers · asked by shawn s 2

it can be more than one...can it?

2007-09-13 06:55:22 · 7 answers · asked by -x-lollie-x- 1

2007-09-13 06:53:45 · 2 answers · asked by maxfashun911 1

1. Explain how the density of an irregular-shaped wooden block is affected if
a) the center is hollow;
b) the block is not completely submerged when determining volume.

2. Assume that the plastic chips in your flotation experiment were floating on top of the acetone. Could you still use water as a second liquid to bring the chips to the middle of the liquid? Explain.


Any help is very much appreciated! :)

2007-09-13 06:43:44 · 2 answers · asked by Kate 1

2007-09-13 05:49:30 · 6 answers · asked by cdha3 1

What is the order of polarity and why?
sodium chloride
urea
benzoic acid
napthalene

2007-09-13 05:40:49 · 3 answers · asked by Anonymous

Does anybody know the common names of niacin,riboflavin,and sodium bicarbonate

2007-09-13 05:36:23 · 2 answers · asked by Mina 1

Sulfuric Acid may be produced by the following process:
4FeS2 + 11O2 --> 2Fe2O3 + 8SO2
2SO2 + O2 --> 2SO3
SO3 + H2O --> H2SO4

the right answer is 20.00
please explain why this is, and please also list the steps that you took in order to get the answer

2007-09-13 05:36:22 · 2 answers · asked by ny_spinner_dan 3

is SO4 a compond and does it contain a metal or not

2007-09-13 05:28:17 · 3 answers · asked by Anonymous

I dont understand how to calculate the number of protons, neutrons and electrons. It says calculate the number of protons,neutrons,and electrons, in a. 13 is in the top left and 17 is in the botton right then it has CI, then 23/top left 11/bottom left and then Na, then it has 84/ top left 36/bottom left Kr. I have no idea what i am doing, i have never taken chemistry in my life so if anyone could break this down it would help me with the rest of my problems. Thanks!

2007-09-13 05:25:50 · 3 answers · asked by Anonymous

Why is it important to position the sample tube next to the thermormeter bulb in the Thiele tube when getting a boiling point?

2007-09-13 05:07:04 · 1 answers · asked by Anonymous

How many grams are there in 1.00L of alcohol if density is 0.78945 g/cm^3? (1mL = 1 cm^3)

2007-09-13 05:06:11 · 7 answers · asked by jobroluvr=)<3 1

2007-09-13 05:02:01 · 4 answers · asked by Autumn H 1