Search found 13 matches

by samchung2f
Thu Mar 16, 2017 10:33 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Chirality [ENDORSED]
Replies: 1
Views: 446

Chirality [ENDORSED]

Will we have to know about chirality for the final?
by samchung2f
Thu Mar 16, 2017 9:48 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Dihedral Angles
Replies: 1
Views: 457

Dihedral Angles

For dihedral angles, why is it that the dihedral angle made by atoms H1-C1-C2-H2 is 0 in the eclipsed ethane molecule on page 105 of the organic chemistry textbook?
by samchung2f
Tue Mar 07, 2017 9:17 pm
Forum: *Ethers
Topic: Double/triple bonds and Functional Groups
Replies: 3
Views: 1222

Re: Double/triple bonds and Functional Groups

Sorry I think you misunderstood my question. What I was trying to ask is would you give functional groups the lowest number when numbering carbons in the main chain or double/triple bonded carbons the lowest number?
by samchung2f
Tue Mar 07, 2017 4:36 pm
Forum: *Ethers
Topic: Double/triple bonds and Functional Groups
Replies: 3
Views: 1222

Double/triple bonds and Functional Groups

When numbering Carbons in the main chain, do double/triple bonds take priority over functional groups or do functional groups take priority over double/triple bonds?
by samchung2f
Wed Mar 01, 2017 5:45 pm
Forum: *Alkanes
Topic: Common Names
Replies: 1
Views: 250

Common Names

On page 94 of the course reader, there is amyl and isoamyl written. What do these terms mean? Are they just other names for pentyl and isopentyl respectively?
by samchung2f
Fri Feb 24, 2017 3:48 pm
Forum: *Nucleophiles
Topic: Course reader p. 82
Replies: 2
Views: 515

Course reader p. 82

On this page, there is the example of the alkene reacting with the neutral Br2 which is polarized (Br2 reacting with double bonded C). In this case, it says that the pi-e- in the double bond of the Cs in the alkene are reacting as a nucleophile. So does this mean nucleophiles can be elements or elec...
by samchung2f
Tue Feb 14, 2017 11:02 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Half-Reactions
Replies: 2
Views: 358

Re: Half-Reactions

P4->H2PO2- + PH3
by samchung2f
Tue Feb 14, 2017 4:47 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Half-Reactions
Replies: 2
Views: 358

Half-Reactions

If a reaction has one reactant molecule or atom that acts as both an oxidizing agent and a reducing agent and two product molecules, do you write the half-reactions with both having the reactant molecule as the reactant and then change the product for each half-reaction?
by samchung2f
Thu Feb 09, 2017 9:27 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Course Reader Example
Replies: 4
Views: 581

Course Reader Example

In the course reader on page 57, it talks about the reaction of diamond being converted into graphite. Is it saying though that the reaction does not occur at all at 25 degrees Celsius and 1 atm or that it just occurs extremely slowly?
by samchung2f
Mon Jan 30, 2017 10:31 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: 9.89
Replies: 1
Views: 277

9.89

Some entries for Sm(standard) in Appendix 2A are negative. What is common about these entries, and why would the entropy be negative? The book states that the entries with negative Sm are aqueous ions. What I do not understand is why are they negative? And how are they more ordered as solvated ions ...
by samchung2f
Thu Jan 26, 2017 7:03 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Quiz 1 Prep # 9
Replies: 2
Views: 859

Quiz 1 Prep # 9

A sample of 1 mol of gas initially at 1 atm and 298 K is heated at constant pressure to 350 K, then the gas is compressed isothermally to its initial volume and finally it is cooled to 298 K at constant volume. Which of the following values is 0? DeltaSsurr and DeltaG DeltaSsys and DeltaSsurr q and ...
by samchung2f
Wed Jan 18, 2017 11:27 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Example p. 20 of Course Reader
Replies: 2
Views: 371

Example p. 20 of Course Reader

In the course reader on page 20, they have the example in a constant P calorimeter at 25 degrees C mix 50.0 mL each of 1.0 M HCL and 1.0 M NaOH. After mixing T=31.9 degrees C. It then says it is an exothermic reaction. Why is this an exothermic reaction? Is it because heat is being released from the...
by samchung2f
Thu Jan 12, 2017 4:03 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: standard molar enthalpy
Replies: 1
Views: 236

standard molar enthalpy

In the book in ch. 8.19 on bond enthalpies, they mention the equation for bond enthalpy as the difference between the standard molar enthalpies of a molecule and its fragments. I know the book talks about standard enthalpy of formation but what exactly then is the standard molar enthalpy of a molecu...

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