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: 27147
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: 29783
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: 828
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: 433
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: 1248
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: 520
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: 1758
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: 399
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: 862
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: 1006
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: 573
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: 986
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: 2698
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?