## Search found 29 matches

Sun Mar 18, 2018 11:19 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1408419

### Re: Post All Chemistry Jokes Here

What did one titration tell the other? Let’s meet at the endpoint.
Sun Mar 18, 2018 11:18 am
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Boltzmann Distributions
Replies: 3
Views: 249

### Re: Boltzmann Distributions

Maria Bajenov 1I wrote:My TA said to understand the concept behind it but not draw it.

Thank you!
Sun Mar 18, 2018 11:17 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Maximum Work
Replies: 3
Views: 372

### Re: Maximum Work

Alexander Peter 1F wrote:I'm not sure how to mathematically prove it, but delta G is supposed to represent the maximum amount of work possible at constant pressure and temperature. Because G = H-TS = U+PV-TS.

Thanks so much!
Sun Mar 18, 2018 11:14 am
Forum: Student Social/Study Group
Topic: Final
Replies: 11
Views: 1232

### Final

Good luck everyone, may all your chemistry dreams come true.
Sun Mar 18, 2018 10:07 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Lyndon's Review #8B
Replies: 2
Views: 271

### Lyndon's Review #8B

From the rate law above, describe what must occur between the reactants in terms of the collision model and activated complex model. Explain the effect of increasing temperature.

What would be a sufficient answer to this question if asked on the exam?
Sun Mar 18, 2018 1:54 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Maximum Work
Replies: 3
Views: 372

### Maximum Work

Why is delta G equal to maximum work when T and P are constant?
Sun Mar 18, 2018 1:50 am
Forum: General Rate Laws
Topic: The Collision Model and Activated Complex Model
Replies: 3
Views: 484

### The Collision Model and Activated Complex Model

Will someone put the collision model and activated complex model in simple terms and explain what you anticipate that we would be expected to do with either?
Sun Mar 18, 2018 1:29 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Value of “k” in Kinetics
Replies: 5
Views: 451

### Value of “k” in Kinetics

What does a value of k > 1 or k < 1 imply in kinetics? We made it very clear in thermodynamics but I do not fully understand its implications in kinetics.
Sun Mar 18, 2018 1:26 am
Forum: Experimental Details
Topic: Activated Complex vs. Transition State
Replies: 2
Views: 1305

### Activated Complex vs. Transition State

Are the terms “activated complex” and “transition state” exactly synonymous and interchangeable?
Sun Mar 18, 2018 1:19 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: When to include an inert electrode such as Pt(s)
Replies: 2
Views: 255

### Re: When to include an inert electrode such as Pt(s)

You include an inert electrode when you are presented with all aqueous substances and need a solid metal to transfer electrons.
Sun Mar 18, 2018 1:14 am
Forum: *Nucleophiles
Topic: Saying Happy Birthday to Emily Warda
Replies: 1
Views: 532

### Re: Saying Happy Birthday to Emily Warda

Michael, I teared up reading this. You have no idea how much this means to me. You are the first and only person who has wished me happy birthday so far. My mother, father, brothers, and twin sister all forgot. This is the best birthday surprise a girl like me could have ever asked for. You are hone...
Sat Mar 17, 2018 5:31 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Boltzmann Distributions
Replies: 3
Views: 249

### Boltzmann Distributions

Will we be expected to know how to draw a Boltzmann distribution? My TA drew one in section but I am uncertain about what we are expected to know.
Sat Mar 17, 2018 5:20 pm
Forum: Calculating Work of Expansion
Topic: Density Assumptions
Replies: 1
Views: 430

### Density Assumptions

When given water in a problem where we use its density, can we always assume it is pure water and that its density is 1 g/mL?
Sat Mar 17, 2018 4:40 pm
Forum: Administrative Questions and Class Announcements
Replies: 5
Views: 546

### Re: Class Study Google Doc

Wow this is incredible! Thank you for sharing with us. I will add what I can if it is not covered already!
Sat Mar 17, 2018 4:30 pm
Forum: Student Social/Study Group
Topic: Final Review Time Tips
Replies: 5
Views: 523

### Final Review Time Tips

What have people found is the best way for them to spend their final time before the exam? Would you recommend book problems, old tests, outlines, etc?
Mon Mar 12, 2018 9:52 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: 15.63
Replies: 1
Views: 154

### 15.63

The solution states that ln(k’/k)=Ea/R*(1/298K - 1/310K) - 0.59.
What is the significance of the -0.59? Someone previously explained that it is mathematically equivalent to ln(k1/k2) but what is the meaning of it? And why is it being subtracted from the rest of the equation?
Mon Mar 12, 2018 9:26 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Replies: 3
Views: 274

Will someone re-explain adsorption? What is an example and why is this concept useful?
Mon Mar 12, 2018 9:26 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Distinguishing a Catalyst
Replies: 4
Views: 287

### Distinguishing a Catalyst

How do you distinguish a catalyst from a reactant? We spoke about how to distinguish a catalyst from an intermediate but how do we distinguish it from a reactant?
Mon Mar 12, 2018 9:24 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Homogeneous Catalysts
Replies: 3
Views: 287

### Homogeneous Catalysts

Why are enzymes normally homogeneous catalysts? I missed this explanation today in lecture.
Mon Mar 05, 2018 3:00 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1408419

### Re: Post All Chemistry Jokes Here

My friend who attends Santa Clara Univerity sent me this photo from her chemistry lecture the other day, enjoy.
Mon Mar 05, 2018 2:49 pm
Forum: Zero Order Reactions
Topic: Pseudo Zero Order Reactions
Replies: 3
Views: 834

### Pseudo Zero Order Reactions

Is it possible to have a pseudo zero order reaction? Can someone explain how this would be possible, if it is?
Mon Mar 05, 2018 2:45 pm
Forum: Zero Order Reactions
Topic: Catalysts in Zero Order Reactions
Replies: 1
Views: 254

### Catalysts in Zero Order Reactions

I know that the rate of a zero-order reaction is independent of [reactant]. To strengthen this concept, Dr. Lavelle explained the use of a catalyst. Does anyone recall exactly how this related to zero-order reactions? Must a catalyst be present to make the first statement true?
Mon Mar 05, 2018 2:31 pm
Forum: General Rate Laws
Topic: 3rd order, 4th order, etc.
Replies: 5
Views: 750

### 3rd order, 4th order, etc.

To what extent do we need to know third, fourth, or further order reactions? Do we need to know their half life reactions?
Mon Mar 05, 2018 2:24 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Rate Determining and Rate Limiting [ENDORSED]
Replies: 1
Views: 120

### Rate Determining and Rate Limiting[ENDORSED]

Are the terms “rate-determining” and “rate-limiting” exactly synonymous? Is one more appropriate than the other? Are there instances where you should use one instead of the other?
Mon Mar 05, 2018 2:01 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Microscopic Reversibility
Replies: 1
Views: 143

### Microscopic Reversibility

Today in lecture, Dr. Lavelle discussed microscopic reversibility. This concept holds that a reaction has the same pathway in the forward and reverse reactions. Would this mean that the activation barrier is the same for both the forward and reverse reaction? What does “same pathway” entail?
Sun Feb 25, 2018 8:34 pm
Forum: General Rate Laws
Topic: Unique Average Rates
Replies: 1
Views: 129

### Unique Average Rates

When is the unique average rate most useful? And will it always be specifically asked for or should we know instances when to use it and when not to use it?
Sun Feb 25, 2018 7:59 pm
Forum: First Order Reactions
Topic: Negative Rates
Replies: 4
Views: 330

### Negative Rates

Is it possible to have negative rates in chemical kinetics? What would this indicate?

I notice that a negative sign is used in the average rate of consumption of R formula to ensure that the rate is positive— is ensuring a positive rate always a necessary precaution to take in kinetics?
Fri Jan 12, 2018 1:28 am
Forum: Phase Changes & Related Calculations
Topic: Work done BY vs. Work done ON [ENDORSED]
Replies: 5
Views: 367

### Work done BY vs. Work done ON[ENDORSED]

As I read through the textbook, it is very clear that we must be able to differentiate between work done by a system and work done on a system. Typically, we are given examples of work done by a system such as gas in a cylinder expanding and pushing a piston but I am having a harder time visualizing...
Fri Jan 12, 2018 12:25 am
Forum: Phase Changes & Related Calculations
Topic: Reversible and Irreversible Processes [ENDORSED]
Replies: 1
Views: 138

### Reversible and Irreversible Processes[ENDORSED]

The book refers to the movement of a piston in response to the pressure of gas in a system as the defining characteristic of reversible/irreversible processes. Is this expansion of a gas the only context that reversible and irreversible processes can occur or is this simply an easy way to think of t...