Search found 18 matches

by Alexander_Chang_1I
Sat Mar 18, 2017 10:53 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Writing a Cell Diagram
Replies: 3
Views: 527

Re: Writing a Cell Diagram

If the states of matter in either the cathode or the anode are all (aq), (l), or (g), then we add a solid electrode (Pt(s) is a common one to remember, but there are others).
by Alexander_Chang_1I
Sat Mar 18, 2017 10:50 pm
Forum: *Calculations Using ΔG° = -RT ln K
Topic: How are the questions using ΔG°=-RT ln k phrased?
Replies: 3
Views: 871

Re: How are the questions using ΔG°=-RT ln k phrased?

I would assume that if something like this appeared on the final, it would look similar to the example done in class. The three variables are standard G of both conformations, and K. A problem like this would either have us calculate the relative G of one conformation, or K, and would have to give u...
by Alexander_Chang_1I
Sat Mar 18, 2017 10:43 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Nernst Equation with Log
Replies: 3
Views: 503

Re: Nernst Equation with Log

If you are going off of the constants on the periodic table that comes with the course reader, the constant for Faraday's constant is 10x larger than it should be. This may be the cause of your confusion.
by Alexander_Chang_1I
Sat Mar 18, 2017 10:37 pm
Forum: Phase Changes & Related Calculations
Topic: Homework 9.13
Replies: 1
Views: 1830

Re: Homework 9.13

The problem states that the reaction is irreversible. The equation you are thinking of is only used when the reaction is reversible and isothermal.
by Alexander_Chang_1I
Sat Mar 18, 2017 10:36 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: When to multiply delta H, G, S??
Replies: 1
Views: 687

Re: When to multiply delta H, G, S??

Yes, we multiply by stoichiometric constants for everything except for Ecell.
by Alexander_Chang_1I
Sun Mar 12, 2017 12:20 am
Forum: *Cycloalkanes
Topic: Problem 1.16
Replies: 1
Views: 810

Problem 1.16

Why is the name 2-isopropyl-1, 1-dimethylcyclopentane? Is there some sort of rule for cycloalkanes that states propyl should come before methyl in the name?
by Alexander_Chang_1I
Sun Feb 26, 2017 11:26 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Chapter 15 Question 55
Replies: 1
Views: 334

Re: Chapter 15 Question 55

a) The equation relating the equilibrium constant to the rate constants is K=k/k rev . Therefore if K is large, that means k is large relative to k rev . b) Using the same formula, we know that K=k/k rev . Therefore k=k rev only if K is 1, and this is a very rare occurrence. You can also remember th...
by Alexander_Chang_1I
Sun Feb 26, 2017 11:16 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Does a reversible system even exist?
Replies: 1
Views: 493

Re: Does a reversible system even exist?

I think that reversible reactions are meant to be more of a theoretical concept, but your second question seems to be on the right track as I'm assuming that is how energy is transferred at the microscopic level.
by Alexander_Chang_1I
Sun Jan 29, 2017 10:12 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Question 8.45
Replies: 1
Views: 304

Re: Question 8.45

The question states that the standard enthalpy of formation is 358.8kJ, which means that to use up one mol of S8 358.8kJ/mol are required. That's where the solutions manual get's kJ/mol from.
by Alexander_Chang_1I
Sun Jan 15, 2017 11:48 am
Forum: Phase Changes & Related Calculations
Topic: Exothermic vs Endothermic
Replies: 3
Views: 443

Re: Exothermic vs Endothermic

Almost. You have to specify the what "the temperature" refers to. Endothermic means that a system gains energy, and exothermic means it loses energy. In this case, temperature will follow the flow of energy: in an endothermic reaction the system increases in temperature and its surrounding...
by Alexander_Chang_1I
Sat Dec 03, 2016 4:20 pm
Forum: *Titrations & Titration Calculations
Topic: HW 13.53
Replies: 2
Views: 871

Re: HW 13.53

H20 is a pure liquid and is not included in the equilibrium equation.
by Alexander_Chang_1I
Sat Dec 03, 2016 4:11 pm
Forum: *Titrations & Titration Calculations
Topic: 2014 Final Q7
Replies: 1
Views: 616

Re: 2014 Final Q7

This question is basically asking what the pH at the stoichiometric point is; to reach the stoichiometric point of a titration one must add enough moles of base to cancel out all the starting moles of acid, changing it to its conjugate base (or add acid to base in the opposite titration). In this ca...
by Alexander_Chang_1I
Sat Nov 19, 2016 11:41 am
Forum: Lewis Acids & Bases
Topic: Homework 12.109- hydronium and hydroxide ions
Replies: 2
Views: 520

Re: Homework 12.109- hydronium and hydroxide ions

The hydronium and hydroxide ions do move around, but it is actually the transferring of protons (H+), resulting in the creation of new hydronium and hydroxide ions that gives the appearance of swift movement.
by Alexander_Chang_1I
Thu Nov 03, 2016 11:43 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Anti bonding Orbitals
Replies: 3
Views: 568

Re: Anti bonding Orbitals

Molecular orbitals form when electrons from atomic orbitals come together into regions along the molecule. Bonding orbitals have a lower energy level, and are therefore located lower in the MO (molecular orbital) diagram, while anti-bonding orbitals have a higher energy level and will be located hig...
by Alexander_Chang_1I
Thu Oct 27, 2016 3:21 pm
Forum: Resonance Structures
Topic: N2O Resconance
Replies: 1
Views: 702

Re: N2O Resconance

Nitrogen ends up being the central atom because it is the least electronegative/has the lowest ionization energy. From there you simply juggle single/triple bonds, comparing the formal charges and ensuring that the compound obeys the octet rule. The structures with the most stable formal charges are...
by Alexander_Chang_1I
Thu Oct 20, 2016 9:31 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: What are considered thhe e- in the outer shell?
Replies: 3
Views: 613

Re: What are considered thhe e- in the outer shell?

Yes, valence electrons are the same as electrons in the outermost shell.
by Alexander_Chang_1I
Thu Oct 06, 2016 10:02 pm
Forum: DeBroglie Equation
Topic: #55? [ENDORSED]
Replies: 2
Views: 510

Re: #55? [ENDORSED]

Make sure that all the units are correct as well by changing velocity from m/s into cm/s
by Alexander_Chang_1I
Fri Sep 30, 2016 9:12 pm
Forum: Limiting Reactant Calculations
Topic: Limiting Reactant Question
Replies: 2
Views: 1976

Re: Limiting Reactant Question

Basically you first have to determine which product is the limiting reactant by converting both O and P to moles and comparing the ratio (which is 4 Oxygen:10 Phosphorous), use the limiting reactant to determine the moles of P4O6 created in the first reaction, and use that to determine the moles of ...

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