Search found 24 matches

by Garret G 2F
Sun Mar 18, 2018 3:01 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7569
Views: 1011556

Re: Post All Chemistry Jokes Here

When I ask Lavelle if we have to derive equations
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by Garret G 2F
Sun Mar 18, 2018 2:56 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7569
Views: 1011556

Re: Post All Chemistry Jokes Here

vqDcC3gPVAVrwYheWLjls4rvbYjP648fa3tHEcb51o8.jpg
by Garret G 2F
Wed Mar 14, 2018 5:25 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: complex molecules
Replies: 8
Views: 411

Re: complex molecules

More information on what affects molar entropies can be found here: https://opentextbc.ca/introductorychemistry/chapter/measuring-entropy-and-entropy-changes-2/ "Larger, more complex molecules have higher standard molar enthalpy values than smaller or simpler molecules. There are more possible ...
by Garret G 2F
Wed Mar 14, 2018 5:18 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius Equation and constant
Replies: 3
Views: 186

Re: Arrhenius Equation and constant

The Arrhenius Equation and constant is discussed here: https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=151&t=29670&p=91991&hilit=Arrhenius+Equation&sid=97f0f97f96c8f028fa56ad589f831963&sid=97f0f97f96c8f028fa56ad589f831963#p91991 "A", I believe, will not need to be c...
by Garret G 2F
Sat Mar 10, 2018 5:58 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalysts [ENDORSED]
Replies: 2
Views: 350

Re: Catalysts [ENDORSED]

The difference is that homogenous catalysts are catalysts that are in the same phase as the reactants (solid catalyst-solid reactant) and heterogeneous catalysts are catalysts that are in different phase (solid catalyst-gas reactant). There's information on catalysts on page 76 of the course reader...
by Garret G 2F
Sat Mar 10, 2018 5:50 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Intermediate [ENDORSED]
Replies: 7
Views: 219

Re: Intermediate [ENDORSED]

Intermediates are FORMED and then CONSUMED within the steps of elementary reactions. Catalysts are present from the beginning and are not consumed in the reaction; this is why only a little bit of catalyst is needed to increase the rate of a specific reaction. Here is a video that explains this in ...
by Garret G 2F
Sat Mar 10, 2018 5:28 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: What is Molecularity?
Replies: 9
Views: 751

Re: What is Molecularity?

Here is a good video on the topic. It explicitly explains the difference between order and molecularity: https://youtu.be/qpoAb8rhUr0
by Garret G 2F
Fri Mar 02, 2018 7:54 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius Reaction
Replies: 6
Views: 196

Re: Arrhenius Reaction

The Arrhenius Reaction will explain to us how temperature affects rate constants. Here is a good intro video to get an idea of the topic before Lavelle covers it: https://www.youtube.com/watch?v=3cFhhwM-zdc
by Garret G 2F
Fri Mar 02, 2018 7:38 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Rate Constant [ENDORSED]
Replies: 3
Views: 153

Re: Rate Constant [ENDORSED]

This Bozeman science video does a really great job of explaining exactly what a rate constant is in terms of the rate law: https://www.youtube.com/watch?v=eOSRn0jPbTk
by Garret G 2F
Fri Mar 02, 2018 7:33 pm
Forum: Zero Order Reactions
Topic: Zero order common?? [ENDORSED]
Replies: 5
Views: 195

Re: Zero order common?? [ENDORSED]

Here is a link to more information on zero-order reactions. Most of the things this site covers are also in the book and mentioned by Lavelle, but it is a good summary. https://chem.libretexts.org/Core/Physical_and_Theoretical_Chemistry/Kinetics/Reaction_Rates/Zero-Order_Reactions
by Garret G 2F
Tue Feb 27, 2018 3:58 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7569
Views: 1011556

Re: Post All Chemistry Jokes Here

What do you call an acid with an attitude?

A-mean-oh acid
by Garret G 2F
Sun Feb 18, 2018 10:41 pm
Forum: Balancing Redox Reactions
Topic: Helpful Videos
Replies: 4
Views: 186

Re: Helpful Videos

by Garret G 2F
Sun Feb 18, 2018 10:36 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Nernst equation
Replies: 4
Views: 213

Re: Nernst equation

This video does a great job of explaining how the Nernst equation works intuitively: https://www.youtube.com/watch?v=EGFYS7PdIzA
by Garret G 2F
Sat Feb 10, 2018 4:52 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: isothermal expansion
Replies: 2
Views: 121

Re: isothermal expansion

Here is how the book answers that on page 274: "For instance, when an ideal gas expands isothermally, its molecules continue to move at the same average speed, so their total kinetic energy remains the same. Because there are no forces between the molecules, their total potential energy also re...
by Garret G 2F
Sat Feb 10, 2018 4:29 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Temperature
Replies: 1
Views: 109

Re: Temperature

This simply means the temperature must be constant.
by Garret G 2F
Sat Feb 03, 2018 7:41 pm
Forum: Calculating Work of Expansion
Topic: Reversible vs Irreversible [ENDORSED]
Replies: 3
Views: 190

Re: Reversible vs Irreversible [ENDORSED]

I really like to look at the curves of P vs V and take the area under them as total work done. This YouTube video explains reversible and irreversible processes really well: https://www.youtube.com/watch?v=LdM0DzlS3fQ
by Garret G 2F
Sat Feb 03, 2018 6:53 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Spontaneous
Replies: 14
Views: 416

Re: Spontaneous

This video does a really great job of explaining how spontaneity and Gibbs Free Energy are related https://www.youtube.com/watch?v=CHHu-iTwHjg
by Garret G 2F
Mon Jan 22, 2018 11:58 am
Forum: Phase Changes & Related Calculations
Topic: 8.115 part b
Replies: 1
Views: 94

8.115 part b

If we know that ~14.73 moles of H2 were burned in a combustion reaction and that the temperature (298K) and Volume (30L) did not change, just the pressure (16 atm to 4 atm), How do we find the heat given off in the reaction? Do we need to look up the enthalpy of this reaction?
by Garret G 2F
Sat Jan 20, 2018 9:31 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Table of bond enthalpies
Replies: 4
Views: 182

Re: Table of bond enthalpies

I am not sure which table in the book you are referring to, but any table full of bond enthalpies could refer to the making or breaking of bonds. The important thing to remember is that making bonds release energy (exothermic) and breaking them take energy (endothermic). To the second part of the qu...
by Garret G 2F
Mon Jan 15, 2018 12:09 pm
Forum: Phase Changes & Related Calculations
Topic: Most stable phases for halogens
Replies: 3
Views: 172

Re: Most stable phases for halogens

He also mentioned that Carbon's most stable form is Graphite.
by Garret G 2F
Mon Jan 15, 2018 11:59 am
Forum: Phase Changes & Related Calculations
Topic: Questions about Heat
Replies: 3
Views: 134

Re: Questions about Heat

The book does a really good job of explaining this difference on page 268. Which is says: Do not confuse "heat" and "thermal energy." Heat is energy in transit as a result of a temperature difference. Thermal energy (the energy of thermal motion) is the energy associated with the...

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