Search found 19 matches
- Sun Mar 11, 2018 8:43 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Homework 15.67
- Replies: 1
- Views: 334
Homework 15.67
Can someone explain how to start this problem? Thank you!!
- Sun Mar 11, 2018 8:41 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: What is Molecularity?
- Replies: 9
- Views: 2448
Re: What is Molecularity?
Elementary rxns are classified according to their molecularity, the number of reactant molecules, atoms, or ions taking part in that particular rxn
- Sun Mar 11, 2018 8:39 pm
- Forum: First Order Reactions
- Topic: Pseudo First Order Reaction
- Replies: 7
- Views: 1665
Pseudo First Order Reaction
Can someone explain when we would need to use a pseudo first order reaction?
- Sun Mar 04, 2018 6:03 pm
- Forum: General Rate Laws
- Topic: homework 15.19 part c
- Replies: 1
- Views: 295
homework 15.19 part c
Can someone explain how to get the right answer for part c please!!
- Sun Mar 04, 2018 5:58 pm
- Forum: General Rate Laws
- Topic: Half-Life
- Replies: 2
- Views: 479
Re: Half-Life
You might be asked to calculate how much of a substance will be left after a specific amount of time has passed, in which case you could use the half life equation to answer
- Sun Mar 04, 2018 5:56 pm
- Forum: Zero Order Reactions
- Topic: Will we need to know how to derive equations? [ENDORSED]
- Replies: 9
- Views: 1197
Re: Will we need to know how to derive equations? [ENDORSED]
Since there are equations that are easier to use to solve for some problems that come from derivations from the equations that are given, you technically need to know how to derive them, but I dont think we would be tested on actually deriving them
- Sun Feb 18, 2018 3:27 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell diagram
- Replies: 2
- Views: 397
Cell diagram
When do you add an inert metallic component to the cell diagram? If you add one to one electrode, do you have to add it to the other?
- Sun Feb 18, 2018 2:49 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing redox rxns [ENDORSED]
- Replies: 7
- Views: 930
Re: Balancing redox rxns [ENDORSED]
Toolbox 14.1 in the textbook on page 563 gives step by step for balancing redox equations if thats any help!
- Sun Feb 18, 2018 2:08 pm
- Forum: Balancing Redox Reactions
- Topic: 14.3 part d
- Replies: 1
- Views: 317
14.3 part d
Can anyone explain how to balance the half reactions for part d?
- Mon Feb 05, 2018 12:48 am
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: 9.27 A
- Replies: 5
- Views: 654
Re: 9.27 A
Since Br is a bigger molecule than F it makes it more complex which means it also has a larger entropy.
- Mon Feb 05, 2018 12:44 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: negative entropy [ENDORSED]
- Replies: 10
- Views: 5660
Re: negative entropy [ENDORSED]
A negative entropy just means that the system is becoming more ordered, it doesn't mean that there isn't any entropy.
- Mon Feb 05, 2018 12:36 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Homework 9.69
- Replies: 1
- Views: 242
Homework 9.69
Is this the type of question you would use the Hess's Law approach? If not can someone explain how to solve this please!
- Sun Jan 28, 2018 8:11 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Difference between systems? [ENDORSED]
- Replies: 8
- Views: 1037
Re: Difference between systems? [ENDORSED]
Closed has a fixed amount fo energy but it can exchange energy with its surroundings (cold pack)
Open can exchange both matter and energy with the surroundings (human body)
Isolated has no contact with its surroundings (thermos)
Open can exchange both matter and energy with the surroundings (human body)
Isolated has no contact with its surroundings (thermos)
- Sun Jan 28, 2018 8:02 pm
- Forum: Phase Changes & Related Calculations
- Topic: Superheating
- Replies: 6
- Views: 3328
Re: Superheating
Nice question. Superheating is when something goes over its boiling point without actually boiling!
- Sun Jan 28, 2018 8:01 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Bond Enthalpies
- Replies: 7
- Views: 797
Re: Bond Enthalpies
Hi Abby!!! Your question is really good. The reason it is more stable is because the bonds are harder to break!
- Sun Jan 21, 2018 9:28 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: HW 8.57
- Replies: 1
- Views: 254
HW 8.57
Can someone explain how you would approach this question?
- Sun Jan 21, 2018 9:15 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 3 Test Topic is endorsed
- Replies: 37
- Views: 4738
Re: Week 3 Test Topic is endorsed
Can anyone give me an example of a conceptual question that has to do with work or energy?
- Mon Jan 15, 2018 10:07 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Determining sign of q
- Replies: 2
- Views: 250
Determining sign of q
How do you know what sign q has?
- Wed Oct 25, 2017 9:08 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Subshell Qualities
- Replies: 2
- Views: 534
Re: Subshell Qualities
That is false because the electrons in an atom directly correspond to its charge. For example, if a Z atom loses one electron, it becomes Z⁻¹