## Search found 13 matches

Tue Mar 14, 2017 10:36 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Exam Details and Review Sessions Winter 2017
Replies: 114
Views: 16112

### Re: Final Exam Details and Review Sessions Winter 2017

What equations should we know how to derive for the final exam?
Wed Mar 08, 2017 1:53 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2017
Replies: 183
Views: 17080

### Re: Quiz 3 Winter 2017

How do you know when to add "iso" when naming compounds?
Sun Feb 12, 2017 1:36 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Molecular Entropy
Replies: 3
Views: 484

### Re: Molecular Entropy

If you are given a monatomic gas in one container, diatomic molecules that are not vibrationally active in a second container, and diatomic molecules that are vibrationally active in a third container, how would an increase in entropy affect the change in entropy of each one? Which one has the great...
Sun Feb 05, 2017 11:16 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Change in gibbs free energy
Replies: 1
Views: 266

### Re: Change in gibbs free energy

I understood the composition of the reaction as referring to the number of moles of each substance. This is important in Gibbs free energy problems because you need to multiply the number of moles of each substance by the deltaS and deltaH of each substance, which you then use to calculate deltaG.
Sat Jan 28, 2017 9:58 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy
Replies: 7
Views: 663

### Re: Entropy

I understand that with a more massive substance, the higher the entropy. But, how can you distinguish in the level of entropy between a solid, a liquid, and a gas of the same substance?
Sat Jan 21, 2017 9:33 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Isothermal systems [ENDORSED]
Replies: 1
Views: 318

### Re: Isothermal systems[ENDORSED]

Yes, in a reversible reaction, the change in internal energy will be zero and I think that that also means that heat and work will have the same magnitudes but different signs. In an isolated system, there is also no change in internal energy due to the fact that no matter or heat can be transferred.
Tue Nov 29, 2016 11:06 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH and Kp/Ka
Replies: 1
Views: 894

### pH and Kp/Ka

How does pH relate to Kp and Ka? How are you able to tell whether a molecule is acidic or basic if you are only given the Kp or Ka? I saw a problem like this online and was confused, thank you!
Sun Nov 13, 2016 4:19 pm
Forum: Naming
Topic: Oxidation Numbers
Replies: 1
Views: 223

### Oxidation Numbers

How is the oxidation number of the transition metal found? Is this the number that goes in parentheses?
Sun Nov 06, 2016 3:20 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Molecular Orbital Theory
Replies: 4
Views: 499

### Re: Molecular Orbital Theory

How does bond order relate to molecular orbital theory?
Thu Oct 27, 2016 11:47 am
Forum: Resonance Structures
Topic: Resonance structures [ENDORSED]
Replies: 3
Views: 545

### Re: Resonance structures[ENDORSED]

I am a little confused on the concept of resonance. Is it just that the same molecule has different possible structures?
Thu Oct 13, 2016 8:32 pm
Forum: Trends in The Periodic Table
Topic: Ionization
Replies: 1
Views: 337

### Ionization

Why is the second ionization energy of an element higher than the first? I understand that removing a second electron is harder than removing the first, but I do not understand how/why the energy is higher. Thanks!
Thu Oct 06, 2016 2:15 pm
Forum: Properties of Light
Topic: Homework Problem 1.55
Replies: 4
Views: 653

### Homework Problem 1.55

Can anyone explain homework problem 1.55 please? I am not sure where to begin! Is it similar to a photoelectric effect problem? Thanks!
Thu Sep 29, 2016 11:04 am
Forum: Photoelectric Effect
Topic: Photoelectric Effect [ENDORSED]
Replies: 12
Views: 1576

### Re: Photoelectric Effect[ENDORSED]

I understand that you need the threshold energy to in order to get the kinetic energy, but I don't really understand what it is. What does threshold energy mean in the photoelectric effect and where do you get it from?