Chemistry - April 2007

I need some quick help answering these questions on my study guide. I have a test on Tuesday that I just found out about. The directions say that one answer will be used more than once.

Here is a link to a picture of the page I need help on:
http://i175.photobucket.com/albums/w153/Dexter47/100_0322.jpg

2007-04-14 20:01:25 · 2 answers · asked by dex4774 1

Professor Snape owns a balance scale that he uses to weight the potion samples. He always places the samples on the left pan of the balance and places weights (can be any value) on the right pan until a balance is achieved. What is the smallest number of weight he will need if he wishes to be able to balance all possible samples weighing an integral number of grams between
(a)1 and 1000?

(b)1 and n?

2007-04-14 19:46:52 · 2 answers · asked by jolin 1

2007-04-14 19:35:54 · 4 answers · asked by Anonymous

2007-04-14 19:19:59 · 5 answers · asked by anjali 2 1

In an Electrolytic cell, a current of 0.250 amps is passed through a solution of a chloride of iron, producing Fe and Cl2.

When the cell operates for 2.00 hours, 0.521g of iron is deposited at one electrode. Determine the formula of the chloride of iron in the original solution.

I've been tryin to do this problem for almost 2 hours now. can someone help clarify things for me please! thanks

2007-04-14 19:03:00 · 3 answers · asked by epikhigh121 1

polydentate ligands result in more stable complex ions
then do monodentate ligands



An example of formation equilibrium for a complex ion in solution is:

Al3+ + 6F− ↔ [AlF6]3− Kf = 5.0 × 10−3



ΔG = −RT ln( Kf )



remember, the more negative the value the of ΔG the more stable
are the products of reaction that are formed




Which of the following are true statements ?



a) en stands for ethylenediamine, a bidentate ligand


b) The subscript f in Kf stands for 'free energy'


c) A very large value of Kf for a chemical reaction in which a coordination complex
is a product would indicate that the complex formed is a relatively stable one


d) A very large value of Kf for a chemical reaction in which a coordination complex
is a product would indicate a relatively small decrease in Gibbs free energy

2007-04-14 18:52:26 · 3 answers · asked by Anonymous

2007-04-14 18:50:15 · 4 answers · asked by Anonymous

2007-04-14 18:49:25 · 3 answers · asked by Anonymous

Hello,

I have an assignment to write a lab practicum and experiment for a college course. Here is the assignment:

Goal: To determine BOTH the concentration and the identity of an unknown acid. You and your lab partner will be given an unknown acid. It will be one of the following: hydrochloric acid, hydroiodic acid, sulfuric acid, or phosphoric acid.

I need to write up a protocol explicitly detailing how you will determine the concentration of the unknown acid. And then a protocol to determine the type.

We are only given a certain amount of acid to work with. If we run out, there are no refills.

so, what procedure would I use to figure this out? titration? What are teh steps, etc. I have to be VERY detailed. Thanks for any help!

2007-04-14 17:47:02 · 3 answers · asked by Anonymous

I have liquids from my dad's workplace and I want to experiment to see if they're really that dangerous. Is it really that dangerous?

2007-04-14 17:11:53 · 12 answers · asked by Anonymous

2007-04-14 16:35:54 · 4 answers · asked by Anonymous

Can someone please help me with these questions? (The moles and grams go with whats on top of it) Thanks in advanced!

___8 Fe____+_____1 S8 (8 is subscript)_____=_____8 FeS
(1 mole= 55.8 g)______(1 mole= 256.5g)_______(1 mole= 87.9g)

1. How many moles of FeS can be made from 10.0 grams of Fe?

2. How many moles of FeS can be made from 100.0 grams of S8?

3. How many moles of FeS can be made from 10.0 grams of Fe AND 100.0 grams of S8?

4. How many grams of FeS can be made? (Convert your answer from #6 into grams of FeS):

2007-04-14 16:35:16 · 1 answers · asked by Lathisha R 1

For example the oxygen a mouse uses (metabolic ratio, weight, size per time maybe?) or how much co2 a plant uses...

2007-04-14 16:27:13 · 1 answers · asked by Anonymous

I have another question:
What is the cell potential of the following cell at 25 oC? Note Au is a passive electrode
Cu / Cu2+ (0.00410 M) // Cr3+ (0.440 M), Cr2O72- (0.0460), H1+ (1.00 M) / Au

for the first question I've already tried: 4.83 and 5.74
for the second question I've already tried: .94278 V and .91318 V

2007-04-14 15:17:50 · 1 answers · asked by Annette S 1

Using the equations of the chemcial reactions in the Leblacn process, calculate (in moles) the amount of the air pollutant HCl released for each mole of sodium carbonate produced.

the process as equations:
NaCl + H2SO4 --> NaHSO4 + HCl
NaHSO4 + NaCl --> Na2SO4 + HCl
Na2So4 + CaCO3 +2C --> Na2CO3 + CaS + 2CO2

2007-04-14 14:46:42 · 1 answers · asked by no name 1

If you can, please answer the following question in detail with examples. thanks!

After explaining that he true goal of love is "engendering an begetting upon the beautiful upon the beautiful," (Symposium 206e), Diotima goes on to argue that "from what has been admitted, we needs must yearn for immortality no less than for good, since love loves good to be one's own for ever. And hence it necessarily follows that love is of immortality" (207a). In climbing the ladder to the contemplation of divine beauty, as she later outlines it, what is engendered, and why is it immortal?

2007-04-14 14:46:23 · 1 answers · asked by Anonymous

2007-04-14 14:33:27 · 1 answers · asked by HELLO 2

I've had a hard time looking for these:

1.What are the structures of the following peptide bonds:

-Glycylserine
-Serylglycine

2. Hidrolysis of serylglycine?

Any help would be appreciated

2007-04-14 14:11:26 · 1 answers · asked by fender123 1

Is it produced, or is it obtained?

2007-04-14 13:27:58 · 4 answers · asked by Gina 1

2007-04-14 12:45:48 · 5 answers · asked by bunny 1

Activity 2a. the dimensions of the larger block are twice the dimensions of the smaller block.Calculate the ratio of the larger blocks volume to the smallet blocks volume.deminsions: smaller: 3cm x 4cm x 2cmlarger: 6cm x 8cm x4cmb. determine what the volume ratio would be if the larger blocks dimensions were 10 times the smaller blocks dimensionsActivity 3Suppose the residents in your area have decided to honot you, a friend , or a local hero ( i chose my brother) by building a 100-ft solid-gold statue in the center of town. Draw a sketch of the statue ( already done ). Estimate the weight and cost ( this is what i dont understan )hints:*use what you learned in activity 2 to estimate the ratio of the statue's volume to that of your subject.( how do i find his volume)*think about how the weight ratio relates to the volume ratio.*You'll need to find the density of gold.You'll also need to compare the density of gold to that of a person. keep in mind that our bodiesare mostly water.

2007-04-14 11:51:41 · 1 answers · asked by moviefanatic1993 1

THe temp is 38 deg Celsius at the end of the reaction.

What is the pressure at the conclusion of the reaction?

How do I figure this out?! I completely missed the lecture..>!

2007-04-14 11:50:35 · 1 answers · asked by ma.roddy 1

In the Haber process for the production of ammonia, what is the relationship between the rate of production of ammonia and the rate of consumption of hydrogen?

2007-04-14 11:46:10 · 1 answers · asked by westafrica88 1

2007-04-14 11:30:05 · 3 answers · asked by steve_r_r 1

Is it experimentally possible for the heat absorbed by an object to exceed the work performed on it? Explain.

2007-04-14 11:27:53 · 1 answers · asked by 3ajeeba_q8 2

2007-04-14 11:15:57 · 1 answers · asked by rene w 2

what is the most common cynide product in the house and i need info on pool sunscreen, some sort of adic and favourite cynide facts

2007-04-14 10:48:24 · 1 answers · asked by Me + Me = BANG! 2

HCO31- + H2O H3O+ + CO32-

HCO31- and H3O+
HCO31- and H2O
H2O and H3O+
HCO31- and CO32-
H2O and CO32-
H3O+ and CO32-

2007-04-14 10:26:34 · 1 answers · asked by sakinah_123 1

proton donor
proton acceptor
electron pair donor
electron pair acceptor
H1+ donor
H1+ acceptor
OH1- donor
OH1- acceptor

2007-04-14 10:23:06 · 1 answers · asked by Anonymous

H2O + N2H4 OH1- + N2H51+

2007-04-14 10:21:45 · 1 answers · asked by Anonymous