Chemistry - October 2007

(a) 14.7
(b) 44.0
(c) 78.0
(d) 26.0

2007-10-20 13:37:01 · 1 answers · asked by Edgardo M 1

Why is there 3 Oxygen atoms? why not 2 or 1?
and last but not least.....why do we put the negative and positive after the number when stating the oxidation number and the charge?
thanks

2007-10-20 13:04:37 · 5 answers · asked by Boo Radley 4

A 4.182 g sample of a mixture Zn and Al is treated with excess HCl. If 0.1686 moles of H2 are obtained, then what os the % by mass of Zn in the original mixture?

2007-10-20 12:59:01 · 1 answers · asked by Help! 1

A solution is prepared by dissolving 10.6 g ammonium sulfate in enough water to make 100.0 mL of stock solution. A 10.00 mL sample of this stock solution is added to 58.00 mL of water. Calculate the concentration of ammonium ions and sulfate ions in the final solution.

2007-10-20 12:36:10 · 1 answers · asked by Anonymous

2007-10-20 11:47:03 · 1 answers · asked by Anonymous

im doing this investigatory project on how potassium affects the soap but i found out potassium content in bananas is low and that pure potassium would burn in water.. is there a way to extract potassium (or a compound of it) from another source that is not difficult to obtain?

2007-10-20 11:26:25 · 2 answers · asked by jtg371 2

29 CU:

1S^2, 2S^2, 2P^6, 3S^2, 3P^6, 4S^2, 3D^9
or
[Ar] 4S^2, 3D^9
but that is not the right answer.

They say it is: [Ar] 4S^1, 3D^9 and so does wiki.
Why?

2007-10-20 11:21:41 · 4 answers · asked by evilshenanegans 1

2007-10-20 11:16:41 · 0 answers · asked by sarahx3l 1

what is best octet representation of the compound hydrogen sulfide?

2007-10-20 11:09:32 · 1 answers · asked by Raisa S 1

How many moles of potassium iodide, KI, must be used to make 1.500 L of a 0.2 M solution?

Could you also explain how you get the answer?

2007-10-20 11:06:34 · 1 answers · asked by falconsfreak08 1

Which of the following designations, polar or nonpolar, are correct for the given compounds below ?

a) F2 : polar
b) CCl4 : nonpolar
c) CaCl2 : polar
d) CH3CH2F : nonpolar

2007-10-20 11:02:51 · 1 answers · asked by jason g 1

Caproic acid (molar mass = 116g/mol) is composed of C, H and O atoms. Combustion of a 0.225g sample produces 0.512g CO2 (carbon dioxide) and 0.209 H20 (water).
a) Find empirical formula of caproic acid
b) Find molecular formula of caproic acid

2007-10-20 09:51:23 · 1 answers · asked by Questionnaire 3

How many moles of ions are present in water solutions prepared by dissolving 0.4132 mol of
a) magnesiom chloride
b) manganese (II) nitride
c) cobalt (III) nitrate
d) iron (II) permanganate

2007-10-20 09:47:02 · 2 answers · asked by hsm 4

2007-10-20 09:45:55 · 3 answers · asked by Anonymous

a) What is the approximate relative atomic mass of this element?
b) Identify X.

2007-10-20 09:36:13 · 5 answers · asked by Anonymous

If you're adding two chemical equations, and you have two of the same molecules, one on reactant side, and one on the product side, BUT they have different states... can you cancel them out?

E.g. H2O(l) on reactants, H2O(g) on products.

2007-10-20 09:21:24 · 2 answers · asked by de4th 4

A reagent bottle is labeled 0.450 M K2CO3. If 50.0 mL of this solution is added to enough water to make 125 mL of solution, what is the molarity of the diluted solution?

2007-10-20 09:18:54 · 2 answers · asked by hsm 4

Ok, so for this lab, we had to dry some silver chloride in a Goch crucible in an oven. Then we were supposed to take it out of the oven, and make sure to let the crucible and silver chloride cool before weighing it. One of the follow-up questions for the lab is if the crucible and silver chloride were weighed while still hot, would the percent yield of silver from the original alloy be higher or lower than the true value and why (we were given an alloy with silver, and we extracted the silver into silver chloride, so that we weigh the silver chloride and use calculations to figure out the amount of silver present in the original alloy). Basically I'm pretty sure the question means if the weight of the crucible and silver chloride will be more or less than at room temperature and why, because this is what would affect the percent yield in the calculations.

2007-10-20 09:05:43 · 1 answers · asked by ajfmf90 2

One piece of copper jewelry at 111°C has exactly twice the mass of another piece, which is at 48.0°C. Both pieces are placed inside a calorimeter whose heat capacity is negligible. What is the final temperature inside the calorimeter (c of copper = 0.387 J/g·K)?

2007-10-20 08:37:00 · 1 answers · asked by jnester0289 1

So I have .033 moles of HCL and .016 moles of Mg how do I find the ratio?
I know it's mole of HCl/mole of Mg but that's not correct, maybe it's the form you have to write it in?

2007-10-20 06:06:09 · 3 answers · asked by Anonymous

what is the best way to decide if a solution is aqueous, L, gaseous , or solid?
Is there an easy shortcut to finding the oxidation number of a ion?

2007-10-20 06:05:52 · 2 answers · asked by Melissa E 1

2007-10-20 05:55:53 · 1 answers · asked by Anonymous

Write out the systematic names of the following compounds;
S2CL2, K2CO3, HBr, PCI5. AS2O5

2007-10-20 05:49:07 · 4 answers · asked by Shantell C 1

2007-10-20 05:36:39 · 9 answers · asked by Red 2

If you do the right reaction can you turn other metals into gold? Can you do this to other metals?

EX. We did a lab with hydrochloric acid and turned a penny gold. You heat up the acid and drop in the penny and let it turn silver then pull it out cool it and put it in heat it will turn to gold.

2007-10-20 05:26:07 · 8 answers · asked by Anonymous

how woould i balance such equation?

2007-10-20 05:23:30 · 3 answers · asked by leoncita 2

Is this reactio possible?
I + IO3 -----> I3
Iodide + Iodide trioxide ----> iodide (III)

Also, how wold i balance it?

2007-10-20 05:18:27 · 6 answers · asked by leoncita 2

Please use simple terms, I am not a chemistry-minded person.

2007-10-20 05:15:11 · 1 answers · asked by Anonymous

2007-10-20 04:48:52 · 1 answers · asked by Lauren G 1

Give me some strategy to name the alkyl group with more than
10 Carbon

2007-10-19 21:47:28 · 6 answers · asked by Anonymous