## Search found 17 matches

Sat Mar 12, 2016 1:22 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy for Changes in Pressure
Replies: 1
Views: 320

### Re: Entropy for Changes in Pressure

Because of the way the log function ln(t2)-ln(t1) = ln(t2/t1) which is final-initial and since this is thermodynamics, that is what you would be looking for!
Mon Mar 07, 2016 10:25 am
Forum: *Alkynes
Topic: Exceptions
Replies: 2
Views: 788

### Re: Exceptions

The only exceptions I can think of is that the tripple bond is given priority for numbering the carbons.
Tue Feb 16, 2016 7:57 pm
Forum: General Rate Laws
Topic: General rate Law
Replies: 1
Views: 394

### General rate Law

When do we use the general rate law that has coefficeints -1/a d(a)/dt etc.
I havent run into a problem when we use this so im wondering if I will for hte quiz.
Tue Feb 16, 2016 7:52 pm
Forum: General Rate Laws
Topic: How Balancing Affects Rate Law
Replies: 1
Views: 400

### Re: How Balancing Affects Rate Law

Hi! For the rate law equations you don't use the stoichiometric coefficient because you don't necessarily know that that is the coefficient throughout all of the steps in the reaction is 2. Because you know that it is first order, you only take it to the power of 1.
Mon Feb 15, 2016 10:36 pm
Forum: Second Order Reactions
Topic: Question 51 in the homework [ENDORSED]
Replies: 4
Views: 1086

### Question 51 in the homework[ENDORSED]

15.51 The following mechanism has been proposed for the reaction between nitric oxide and bromine: Step 1: NO -> Br2 + NOBr2 (slow) Step 2: NOBr2 + NO + NOBr -> NOBr (fast) Write the rate law for the formation of NOBr implied by this mechanism. The explanation for the answer: k(NO)(Br2) says that th...
Mon Feb 08, 2016 6:05 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Ordering Ions in terms of Reducing Power
Replies: 1
Views: 816

### Ordering Ions in terms of Reducing Power

When homework questions ask us to order a list of metals by reducing or oxidizing power, I understand how to use the table to get the E values and to adjust for oxidation but how do I know which ion to choose? for example Cu has about 4 different states all with vastly different E values so how do I...
Sat Feb 06, 2016 2:46 pm
Forum: Balancing Redox Reactions
Topic: Choosing Oxidation vs Reduction
Replies: 1
Views: 241

### Choosing Oxidation vs Reduction

In the Gold Ring Dissolving example from page 52 of the course reader I see that we are using the reduction reaction for nitric oxide. But Im confused how you would know to do this seeing as you are putting a gold ring in a solution of nitric acid... so the nitric acid has to have already formed. If...
Tue Jan 26, 2016 3:14 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Q in constant p and constant v
Replies: 2
Views: 493

### Q in constant p and constant v

What are the two equations for q? The course reader has an equation for constant pressure. But what is it for variable pressure?
Tue Jan 26, 2016 3:10 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated vs Isothermal
Replies: 3
Views: 1110

### Re: Isolated vs Isothermal

Cant an isolated system still expand?
Tue Jan 26, 2016 3:07 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Constant P Calorimeter - Bond Formation Q???
Replies: 2
Views: 324

### Re: Constant P Calorimeter - Bond Formation Q???

Generally energy is not required to form a bond but it is definately required to break a bond.
Sun Jan 10, 2016 3:54 pm
Forum: Phase Changes & Related Calculations
Topic: change in enthalpy value
Replies: 3
Views: 469

### Re: change in enthalpy value

But how do you know what the sign of the forward reaction was to begin with? is that dependent on whether the reaction is endothermic or exothermic?
Mon Nov 30, 2015 12:09 am
Forum: Naming
Topic: Naming Coordination Compounds Tutorial
Replies: 1
Views: 366

### Re: Naming Coordination Compounds Tutorial

Here is the mp4 format
Sun Nov 29, 2015 11:53 pm
Forum: Naming
Topic: Naming Coordination Compounds Tutorial
Replies: 1
Views: 366

### Naming Coordination Compounds Tutorial

Wed Nov 18, 2015 12:25 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Problem 10 in the 1st Chapter 3 Practice Quiz
Replies: 1
Views: 412

### Problem 10 in the 1st Chapter 3 Practice Quiz

This question asks tells you that that the equilibrium pressures in a reaction are 1.08 bar for BrCl, 4.9 for Br2, and 7.6 for Cl2. Then it says that half of the brcl is removed from the container and equilibrium is reestablished. what is the new partial pressure? I have attempted this problem both ...
Sun Oct 25, 2015 3:33 pm
Forum: Octet Exceptions
Topic: Expanded Octet
Replies: 9
Views: 2098

### Re: Expanded Octet

Also, is it only Hydrogen and Helium that can have less than an octet?
Sun Oct 11, 2015 8:26 pm
Forum: Properties of Light
Topic: Photon Emission
Replies: 2
Views: 627

### Photon Emission

Hi, I have a question about emitting photons. I do not know how to solve for that quantity using the equations that we have for energy, wavelength etc. In problems 1.27 and 1.59 they use/ask for the "number of photons given off" that should be equal to the amount of electrons that excite a...
Tue Oct 06, 2015 3:34 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Bohr Frequency Condition versus Rydberg Equation
Replies: 1
Views: 739

### Bohr Frequency Condition versus Rydberg Equation

Hello, In discussion, we were told that it might be helpful to use the Rydberg Equation instead of the Bohr Frequency Condition because it is easier to understand (it has no negatives etc.) However, the output of the Bohr is an Energy while the output of the Rydberg is a Velocity so I don't understa...