Search found 30 matches
- Tue Mar 12, 2019 2:10 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Energies
- Replies: 2
- Views: 262
Energies
What is the difference between free energy of activation and activation energy?
- Mon Mar 11, 2019 12:40 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: pre-equilibrium
- Replies: 1
- Views: 195
pre-equilibrium
I just wanted to double check that we are only responsible for the pre-equilibrium approach and not the steady-state approach.
- Mon Mar 11, 2019 12:37 pm
- Forum: Student Social/Study Group
- Topic: Review session
- Replies: 5
- Views: 989
Review session
Is Lyndon having his normal session tonight or will he only be holding the review one on Saturday?
- Thu Mar 07, 2019 5:47 pm
- Forum: Zero Order Reactions
- Topic: plots
- Replies: 1
- Views: 264
plots
Why is it that zero order and first order reactions have a negative slope, but second order reactions don't?
- Tue Mar 05, 2019 8:15 pm
- Forum: Zero Order Reactions
- Topic: Order Reactions
- Replies: 4
- Views: 428
Order Reactions
I just wanted to clarify, are we only responsible for zero, first, and second order reactions?
- Tue Mar 05, 2019 11:49 am
- Forum: General Rate Laws
- Topic: Orders
- Replies: 3
- Views: 364
Orders
What is the significance/importance of finding the order of a reaction? What does it tell us?
- Mon Feb 25, 2019 1:10 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 2 Topics
- Replies: 2
- Views: 306
Re: Test 2 Topics
Yes, that is what Dr. Lavelle said in lecture
- Mon Feb 25, 2019 1:10 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Calculations [ENDORSED]
- Replies: 3
- Views: 374
Calculations [ENDORSED]
Out of delta G, delta H, and delta S, in which calculation do you not include elements in their most stable form?
- Mon Feb 25, 2019 1:06 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Anode and Cathode
- Replies: 6
- Views: 598
Anode and Cathode
If you are given a reaction how can you tell which one is the anode and which one is the cathode?
- Thu Feb 21, 2019 10:15 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: electrodes
- Replies: 1
- Views: 250
electrodes
Could someone explain what cell potential/potential differences between electrodes means?
- Thu Feb 21, 2019 9:55 pm
- Forum: Calculating Work of Expansion
- Topic: Nonexpansion work vs expansion work
- Replies: 3
- Views: 829
Re: Nonexpansion work vs expansion work
expansion work means there was work done in order to change the volume/pressure of something so you would use w=-PdeltaV, and non-expansion work doesn't involve a change in volume like motional or electrical work in which you use Gibbs free energy
- Thu Feb 21, 2019 4:55 pm
- Forum: Van't Hoff Equation
- Topic: Test 2
- Replies: 3
- Views: 598
Test 2
I was wondering if Gibbs free energy and the Van't Hoff equation were the only topics from thermo that we will be tested on for test 2?
- Thu Feb 14, 2019 3:26 pm
- Forum: Student Social/Study Group
- Topic: workshop
- Replies: 3
- Views: 450
workshop
Does anyone know if Lyndon will have his normal workshop on Monday even though it's a holiday?
- Thu Feb 14, 2019 3:12 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: gibbs free energy
- Replies: 10
- Views: 857
gibbs free energy
I was wondering how the change in gibbs free energy relates to the spontaneity of a reaction?
- Tue Feb 12, 2019 7:52 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Extensive vs Intensive
- Replies: 1
- Views: 274
Extensive vs Intensive
Can someone please explain why heat capacity is an extensive property and specific heat capacity and molar heat capacity are intensive properties?
- Fri Feb 08, 2019 11:26 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Molar entropy
- Replies: 2
- Views: 303
Molar entropy
How do you decide which diatomic molecule has a higher molar entropy at the same temp? For example HBr or HF?
- Wed Feb 06, 2019 9:05 am
- Forum: Phase Changes & Related Calculations
- Topic: C (gr) ?
- Replies: 2
- Views: 2179
Re: C (gr) ?
I believe that the book said that C(gr) was an abbreviation for graphite
- Wed Feb 06, 2019 9:02 am
- Forum: Calculating Work of Expansion
- Topic: Isothermal Expansions
- Replies: 3
- Views: 363
Isothermal Expansions
Are isothermal expansions reversible or irreversible or can they be both, and why?
- Sat Feb 02, 2019 3:02 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Seventh edition ? 4C.13
- Replies: 1
- Views: 245
Seventh edition ? 4C.13
An ice cube of mass 50.0g at 0.0 degrees C is added to a glass containing 400.0 g of water at 45.0 degrees C. What is the final temp of the of the system (see tables 4A.2 and 4C.1)? Assume that no heat is lost to the surroundings.
- Sat Feb 02, 2019 2:57 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Seventh Edition ? 4C.3
- Replies: 1
- Views: 222
Seventh Edition ? 4C.3
Calculate the final temp and the change in enthalpy when 765J of energy is transferred as heat to .820 mol Kr(g) at 298K and 1.00 atm at constant pressure. How should I approach this problem?
- Tue Jan 29, 2019 9:51 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: 7th edition 4C.1
- Replies: 1
- Views: 266
Re: 7th edition 4C.1
NO2 would have a higher heat capacity because heat capacity increases with molecular complexity. The more atoms present in a molecule allows for there to be more possible bonds that have vibrations which absorb added energy.
- Fri Jan 25, 2019 5:06 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Seventh Edition ? 4A.9
- Replies: 1
- Views: 211
Seventh Edition ? 4A.9
Can someone please explain how to approach question 4A.9 and what I should infer from it saying that no energy is lost to the surroundings. "A piece of copper of mass 20.0g at 100.0 degrees C is placed in a vessel of negligible heat capacity but containing 50.7 g of water at 22.0 degrees C. Cal...
- Thu Jan 24, 2019 11:17 am
- Forum: Amphoteric Compounds
- Topic: amphoteric v amphiprotic
- Replies: 5
- Views: 1097
Re: amphoteric v amphiprotic
Amphiprotic refers to the ability to donate or accept protons whereas amphoteric refers to the ability to act as an acid or a base. Something that is amphoteric is always amphiprotic, but something that is amphiprotic is not always amphoteric.
- Thu Jan 24, 2019 11:09 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Test 1
- Replies: 8
- Views: 741
Re: Test 1
It is best to memorize the lists of strong acids and bases because once you know those whatever else you are given will be weak acids or bases. If you don't memorize the list you can look at the Ka value and if it is a high Ka that means the acid highly dissociates and therefore it is a strong acid.
- Thu Jan 17, 2019 9:40 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Kb memorization? 7th ed. 6D.5
- Replies: 1
- Views: 325
Re: Kb memorization? 7th ed. 6D.5
They got those values from table 6C.1 which is Ka and pKa acidity constants and table 6C.2 which is Kb and pKb basicity constants on pages 461 and 462 in the seventh edition. I do not think that we need to have these memorized.
- Thu Jan 17, 2019 9:34 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Quadratic equation and ICE box
- Replies: 3
- Views: 283
Re: Quadratic equation and ICE box
The quadratic equation will give you the most accurate answer but the short cut is used when you are given a K value that is less than 10^-3 and this is because that number is so small that it will make no difference so you can disregard the x on the bottom of the fraction. To check this you can sol...
- Tue Jan 15, 2019 1:55 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Part 4 Post-Module Question
- Replies: 4
- Views: 1242
Part 4 Post-Module Question
I am confused on question 17 in the part 4 post module, could anyone please explain? Determine the shift in equilibrium, if any, which will occur for the following reactions when the temperature is increased a) Photosynthesis: 6 CO2 (g) + 6 H2O (l) ⇌ C6H12O6(s) + 6 O2 (g) delta H° = +2802 kJ.mol-1 b...
- Fri Jan 11, 2019 11:03 pm
- Forum: Ideal Gases
- Topic: Notation [ENDORSED]
- Replies: 5
- Views: 542
Re: Notation [ENDORSED]
Brackets denote concentration and partial pressure is not measured by concentration so I would assume that parentheses would be best when you are dealing with partial pressures.
- Fri Jan 11, 2019 8:57 am
- Forum: General Science Questions
- Topic: Week 1 Homework
- Replies: 5
- Views: 486
Re: Week 1 Homework
It is due this Friday in lecture
- Thu Jan 10, 2019 11:08 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K=1
- Replies: 5
- Views: 358
Re: K=1
When K equals one the concentration of products and reactants are equal, which is very rare. The only significance of K equalling one is that we can use it as a marker and say a K above one favors products and a K below one favors reactants