Chemistry - May 2007

2007-05-29 16:25:58 · 2 answers · asked by lajollajuicebox 1

(a) the traditional theory of acids and LeChatelier's principle
(b) the Bronsted theory of acids only
(c) the Bronsted theory of acids and LeChatelier's principle
(d) the Lewis theory of acids only

2007-05-29 16:24:33 · 1 answers · asked by Anonymous

Consider three unlabeled bottles, each containing small pieces of one of the following metals: magnesium, sodium, and silver. The following reagents are used for identifying the metals: pure water, a solution of 1.0M HCl, and a solution of concentrated HNO3
a) Which metal can easily be identified because it is much softer than the other two?Describe a chemical test that distingushes this metal from the other two, using only one of the reagents above.Write a balanced equation for the reaction that occurs.
b) One of the other two metals reacts readily with the HCl solution.Identify the metal and write the balanced chemical equation for the reaction that occurs when this metal is added to the HCl solution.
c) The one remaining metal reacts with the concentrated HNO3 solution.Write a balanced chemical equation for the reaction.
d) The solution obtained in part c) is diluted and a few drops of 1.0M HCl are added.What would be observed? Write a balanced chemical equation for the reaction

2007-05-29 16:17:36 · 4 answers · asked by T Lapp 1

Why does the reactivity of non-metals decrease as you move down a group/family? and why is flourine the most reactive?

2007-05-29 16:01:42 · 2 answers · asked by Stressed @_@ 1

2007-05-29 15:33:16 · 3 answers · asked by cabinohio 1

Carbon, zinc, lead, acid, nicad, fuel cell, alkaline cell, rechargable cell. If u know any of these please tell me

2007-05-29 15:22:50 · 1 answers · asked by Anonymous

2007-05-29 15:21:31 · 4 answers · asked by Anonymous

what is the process? (need it for a chem. lab)

2007-05-29 14:59:43 · 1 answers · asked by Anonymous

K2Cr2O7 + HCl + Na2SO3 = ??

2007-05-29 14:46:51 · 1 answers · asked by Anonymous

2007-05-29 14:38:24 · 3 answers · asked by Barn Babe 3

2007-05-29 14:33:47 · 6 answers · asked by Ted Lim 2

Need Chem help. Thanks!

2007-05-29 14:30:57 · 2 answers · asked by Michelle 2

2007-05-29 14:28:12 · 3 answers · asked by Anonymous

2007-05-29 14:25:00 · 1 answers · asked by Anonymous

2007-05-29 14:23:12 · 3 answers · asked by luby 1

Hi, Im studying for a chemistry exam and these are some practice questions that I need help with...
1. For the compound calcium phosphate, Ca3(PO4)2, what is the total number of ions represented in the formula?
a)2
b)3
c)5
d)4
2. What is the molar mass of Barium Nitrate, Ba(NO2)3?
a)167.3 g/mol
b)199.3 g/mol
c)247.3 g/mol
d)261.3 g/mol
3. How can the solubility of a gaseous solute in a liquid solvent be increased?
a) increasing the volume of the mixing container
b) lowering the temperature of the solvent
c) decreasing the pressure on the liquid
d)Stirring vigorously

2007-05-29 14:16:49 · 2 answers · asked by Dani Z 2

can someone please help me answer these?
i have no idea how to =(.

if 110.0mL of 3.00 M sulfuric acid has 25.0 mL of water added to it. What is the resulting concentration of the solution.

how much water must be added to a 50.0 mL sample of 18.0 M sulfuric acid to gie a resulting concentration of 0.250 M?

What is the sodium ion concentration when 250.0 mL of water is added to 125.5 mL of a 3.21 M solutio of sodium phosphate?

i tried finding the instructions to these kinds of questions in my text book.. but i can't find anything =(

thanks in advance !

2007-05-29 14:08:36 · 1 answers · asked by malibuxdreams 4

can someone please give me the chemical fomula for this.with da banced equation. I have a chemistry project due tomorrow. please help me!!

2007-05-29 13:21:42 · 5 answers · asked by !~LaiLa~! 1

Okay the question is what is the normal boiling point of formic acid, HCOOH, when,

HCOOH(l) delta Hf = -410kj/mol S^0= 130kj/mol
HCOOH(l) delta Hf = -363kj/mol S^0= 251kj/mol

2007-05-29 13:15:49 · 1 answers · asked by Anonymous

does this mean that i am getting slight amounts of radiation when eating a banana? i know that the human body has radioactivity...because of potassium right? but we can tolerate that amount?

2007-05-29 13:01:55 · 13 answers · asked by bubblesrgreat 2

2007-05-29 12:57:24 · 1 answers · asked by love helper 3

I need to find the balanced chemical reaction for phenolphthalein and sodium carbonate as well as the following reactions...Can you help?

sucrose + iodine
calcium carbonate + iodine
sodium bicarbonate + vinegar

2007-05-29 12:54:11 · 3 answers · asked by suelailai 2

Thanks in advance! Please include problems here and e-mail me the answer key to perriermb@yahoo.com

2007-05-29 12:49:36 · 1 answers · asked by perriermb 1

Well the experiment was the following measure 2 ml of HCl and add 2 drops of phenolphthalein and start adding drops of NaOH until the solution become from colorless to pink the same steps were with 4ml of HCl and with 2 ml of H2SO4

the results where the following

TABLE 1
HCl (volume) NaOH ( drops )
2ml 61
4ml 98

TABLE 2
H2SO4 (volume) NaOH ( Drops )
2ml 101

and the questions are:

1) analyzing results compare your responses to analysis item 1. Is there a difference in the average number of drops? What is the ratio between these two numbers? Is it 1:1, 1:2, 2:1, or 1:3? Explain the "chemistry" behind this ratio.

2)1. Now compare your responeses to analysis items 1 and 2. (the same from above)...Is it 1:1, 1:2, 1:3, etc?...(the same from above)

3)Based on your observed results, how many drops of NaOH would be neede to react completely with a 2ml sample of HNO3?

HNO3 + NaOH -> NaNO3 + H2O

2007-05-29 12:30:33 · 2 answers · asked by 321C 1

okay i'm geting confused on a problem hopefull someone can help.

S(rhombic) + O2(g) --> SO2(g)

calculate the standard free energy change (in KJ) for the rection above at 50 degrees celcius.

i got an answer of 300.85 but i believe that it is wrong so thanks in advance to anyone who can help.

2007-05-29 12:28:09 · 1 answers · asked by Anonymous

Group 1 - PbI (<--capital i)
Ca(ClO3)2
C2H6
MgSO3

Group 2 - AlPO4
FeO2
ZnS
Sr(NO3)2

Group 3 - BaCr2O7
AlCl3
Cs2CrO4
SnCO3

Group 4 - CuF
Ca(IO)3
AuI (<--capital i)
CdC2O4

Group 5 - NH4C2H3O2
Ba3(AsO4)2
Mg(BrO4)2
Al(NO2)3

2007-05-29 12:27:49 · 1 answers · asked by Anonymous

today in school i had a chem lab and when i got home the tips of two of my fingers were turning white. I washed them repetitavely but the color remained. then about one hour later they were purple, then black. the materials we used were: 0.2M CoCl2 solution, Concentrated HCl, 0.1M AgNO3, and acetone. why are my fingers changing colors? is this bad? will it go away? what can i do to make it come out?

2007-05-29 12:10:27 · 7 answers · asked by gabst 2

(a) the traditional theory of acids and LeChatelier principle
(b) the Bronsted theory of acids only
(c) the Bronsted theory of acids and LeChatelier principle
(d) the Lewis theory of acids only

2007-05-29 11:30:49 · 1 answers · asked by Didi 1

2007-05-29 11:07:38 · 2 answers · asked by tyler h 1

They are very prevalent in fat free foods like imitation butters and fat free half and half cream. But now they are beginning to put them in regular foods, too, like Turkey Hill Ice Cream. And we didn't even get the fat free kind. I know what they are but I can't seem to find any information on whether they are bad for us in any way. I know they are derived from vegetable fats but they just seem too good to be true. We love everything that contains them! This can't be good??? Can it???

2007-05-29 11:04:37 · 6 answers · asked by Anonymous