## Search found 26 matches

Wed Mar 09, 2016 9:57 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Cis and Trans for cycloalkanes
Replies: 1
Views: 375

### Cis and Trans for cycloalkanes

So for cycloalkanes, when determining if they are cis or trans we look at whether the two substituents of interest are positioned upwards or downwards regardless of if they are axial or equatorial correct?
Tue Mar 01, 2016 1:44 pm
Forum: *Identifying Primary, Secondary, Tertiary, Quaternary Carbons, Hydrogens, Nitrogens
Topic: tert and sec substituents
Replies: 1
Views: 307

### tert and sec substituents

Can someone help me with tert and sec substituents? I'm having trouble identifying and drawing them.
Fri Feb 26, 2016 3:12 pm
Forum: *Electrophiles
Topic: Nucleophiles
Replies: 5
Views: 678

### Re: Nucleophiles

Yes I believe you look at the number of lone pairs when this number is different between two species. However, if they have the same number of lone pairs, then you would look at polarizability.
Sun Feb 21, 2016 1:04 pm
Forum: *Nucleophiles
Topic: Stability of nucleophiles
Replies: 1
Views: 330

### Stability of nucleophiles

So I know that something like Br- would be a nucleophile. I am just wondering why a species like this would be willing to share an electron with an electrophile because isn't a species like Br- it in its most stable from as it is?
Sat Feb 13, 2016 11:05 pm
Forum: First Order Reactions
Topic: Integrated rate laws
Replies: 1
Views: 330

### Integrated rate laws

For 15.29, do you switch the initial concentration of A with the concentration of A at time t in the first order rate law equation because the question is asking for the reaction expressed as the rate of loss of A?
Fri Feb 12, 2016 4:47 pm
Forum: General Rate Laws
Topic: Unique rate of reaction
Replies: 1
Views: 441

### Unique rate of reaction

For 15.3 c do you divide your answer from a by 2 because there are two moles of NO2?
Tue Feb 02, 2016 6:44 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Homework Question 14.13
Replies: 1
Views: 286

### Homework Question 14.13

Can someone explain to me when you need to use Pt(s)? Also, for the cell diagram, how do we know the order to write the species that is being oxidized and its oxidized form and vice versa. I know the oxidized half reaction is written on the left of the cell diagram but between the two species on the...
Sun Jan 31, 2016 2:24 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 11.83 practice problem question
Replies: 1
Views: 236

### 11.83 practice problem question

For this question, why can't you just use the delta G standard conditions when calculating the delta G of the reaction for at 25 degrees C? Is it because we do not know if it is in standard conditions regarding pressure and concentration?
Thu Jan 21, 2016 8:34 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Degeneracy and Equilibrium
Replies: 1
Views: 320

### Degeneracy and Equilibrium

Why in an isolated system is W (degeneracy) maximum at equilibrium?
Fri Jan 15, 2016 5:19 pm
Forum: Calculating Work of Expansion
Topic: Reversible expansion
Replies: 3
Views: 1017

### Reversible expansion

Can someone explain how the work done during a reversible expansion of a gas is the maximum expansion work possible? I know it explains this in the book but it didn't make much sense to me.
Fri Jan 15, 2016 5:15 pm
Forum: Calculating Work of Expansion
Topic: Work of expansion sign
Replies: 1
Views: 338

### Work of expansion sign

Can someone explain to me conceptually why work of expansion of a gas is negative? If a gas is expanding isn't it doing work on its surroundings so shouldn't it be positive?
Fri Jan 08, 2016 1:10 pm
Forum: Phase Changes & Related Calculations
Topic: Steam burn
Replies: 3
Views: 649

### Re: Steam burn

Ok great that makes complete sense. Thank you both!
Fri Jan 08, 2016 11:11 am
Forum: Phase Changes & Related Calculations
Topic: Steam burn
Replies: 3
Views: 649

### Steam burn

I just want to make sure I am understanding this correctly. Steam causes greater burns than water at the same temperature because it releases more joules of energy into the body, right?
Sun Dec 06, 2015 8:55 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: final volume of strong acid/weak base titration
Replies: 2
Views: 675

### Re: final volume of strong acid/weak base titration

I know how to calculate that. The question gave you the molarity of the strong acid and the molarity and volume of the weak base and then asked for the ph at the very end of the titration which is well past the stoich point.
Sat Dec 05, 2015 6:20 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: final volume of strong acid/weak base titration
Replies: 2
Views: 675

### final volume of strong acid/weak base titration

How do you calculate the final volume of acid in a strong acid/ weak base titration? Because there is a homework problem in the book that deals with this and I wasn't sure how to do it.
Sat Nov 28, 2015 3:43 pm
Forum: Amphoteric Compounds
Topic: AlCl3 forms...
Replies: 1
Views: 472

### AlCl3 forms...

How would I know that AlCl3 would form Al(H2O)5OH2+ instead of Al(OH)3?
Tue Nov 24, 2015 3:12 pm
Forum: Amphoteric Compounds
Topic: Amphoteric Compounds
Replies: 2
Views: 667

### Amphoteric Compounds

Can someone please explain to me how we know that BaO is only basic but As2O3 and Bi2O3 can be amphoteric? (This is from the 12.17 practice problem)
Fri Nov 20, 2015 10:57 am
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Inductive Effect
Replies: 2
Views: 939

### Inductive Effect

Can someone please explain the inductive effect?
Fri Nov 13, 2015 4:46 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Changing concentrations of solids and liquids
Replies: 1
Views: 353

### Changing concentrations of solids and liquids

I have a clarification question. Changing the concentration of a solid or liquid does not affect the concentration of the aqueous or gaseous substances in the reaction right?
Thu Nov 05, 2015 5:26 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Max # of ligand bonding sites
Replies: 1
Views: 300

### Max # of ligand bonding sites

How can you determine the maximum number of places on a ligand that can bind simultaneously to a single metal center?
Thu Oct 29, 2015 1:33 pm
Forum: NEWS & RESOURCES
Topic: MO Z<8 vs Z>/=8
Replies: 2
Views: 2009

### MO Z<8 vs Z>/=8

Could someone please explain why diatomic molecules with Z greater than or equal to 8 have p sigma bonds that are lower in energy than their p pi bonds but it is the opposite for molecules with Z less than 8.
Sat Oct 24, 2015 6:23 pm
Forum: Resonance Structures
Topic: Chapter 4 #13
Replies: 1
Views: 360

### Chapter 4 #13

For chapter 4 practice problem #13, wouldn't IO3- be more stable with two double bonds with two oxygens and one lone pair as opposed to the answer in the book which writes it with three single bonds and one lone pair?
Sat Oct 17, 2015 4:31 pm
Forum: Resonance Structures
Topic: Resonance Structures and Energy/ Stability
Replies: 1
Views: 300

### Resonance Structures and Energy/ Stability

I am still a little confused why a compound with resonance structures has lower energy and therefore is more stable than if it didn't have any. I know it says the answer in the book but I am still unclear. Can someone explain please?
Thu Oct 08, 2015 7:23 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectra Online Module Question
Replies: 1
Views: 361

### Atomic Spectra Online Module Question

I watched the online module video for the Atomic Spectra. For one of the pre and post video quiz questions, I was able to figure out the answer by the process of elimination. However, I was wondering how to do the first part of the following problem if it weren't a multiple choice question. It says,...
Wed Sep 30, 2015 7:02 am
Forum: Photoelectric Effect
Topic: Photoelectric Effect clarification question
Replies: 2
Views: 322

### Re: Photoelectric Effect clarification question

That makes much more sense. Thank you very much.
Tue Sep 29, 2015 3:23 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect clarification question
Replies: 2
Views: 322

### Photoelectric Effect clarification question

So in the lecture on Monday we discussed the photoelectric effect and I was wondering if someone could tell me if I have the concept down correctly. So if we were looking at light as a wave, changing the intensity/ amplitude of light did not produce electrons. However, looking at light as particles,...