Search found 14 matches

by Anh Khoa 3E
Sun Mar 19, 2017 12:45 am
Forum: *Calculations Using ΔG° = -RT ln K
Topic: How are the questions using ΔG°=-RT ln k phrased?
Replies: 3
Views: 482

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

I dont think we have to memorize the deltaG's. The questions will probably give us deltaG or give us other variables to solve for it.
by Anh Khoa 3E
Sun Mar 19, 2017 12:42 am
Forum: General Rate Laws
Topic: pre equilibrium
Replies: 4
Views: 475

Re: pre equilibrium

Pre eq is used to determine the rate of the overall reaction when the first step is really fast and the second step is slow. Since the first step is really fast, there is generally a buildup which leads to an equilibrium like mechanism.
by Anh Khoa 3E
Sun Mar 19, 2017 12:34 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Winter 2015 Final Exam 1D
Replies: 1
Views: 253

Re: Winter 2015 Final Exam 1D

It's the difference between specific heat capacity and heat capacity. If they give you specific heat to solve for q, then you need the mass. Look at the units of the capacity give to solve.
by Anh Khoa 3E
Wed Mar 15, 2017 4:18 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: 5/2R vs 3/2R
Replies: 2
Views: 242

5/2R vs 3/2R

When do you use one over the other in equations like q=nCdeltaT and so on?
by Anh Khoa 3E
Wed Mar 15, 2017 4:15 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Help on entropy changes
Replies: 1
Views: 175

Help on entropy changes

There're nCln(T2/T1) and -nRTln(V2/V1). Why do we combine the delta S of these two equations when the problem asks for the entropy when temperature changes and volume changes? I just want to know the reasoning behind adding the results of these two equations to find the total entropy.
by Anh Khoa 3E
Wed Mar 15, 2017 4:11 pm
Forum: *Alkanes
Topic: Naming structure
Replies: 1
Views: 323

Naming structure

if I have a neopentane structure, can I name it as 2,2-dimethylpentane? Is neopentane preferred over 2,2-dimethylpentane?
by Anh Khoa 3E
Wed Mar 15, 2017 4:07 pm
Forum: *Electrophilic Addition
Topic: SN1 vs SN2
Replies: 1
Views: 278

SN1 vs SN2

How do you differentiate between the two? I know that one is unimolecular and the other is bimolecular. But if we were not given the mechanism of the reaction and not told that it is either SN1 or SN2, how do you know it is one over the other?
by Anh Khoa 3E
Sun Mar 05, 2017 5:21 pm
Forum: *Alkanes
Topic: Priorities
Replies: 2
Views: 210

Priorities

If we have carboxylic acid on one end and aldehyde on the other end, which one has a higher priority? In other words, which is named first in the nomenclature?
by Anh Khoa 3E
Sun Mar 05, 2017 5:14 pm
Forum: *Cycloalkenes
Topic: Structure stability
Replies: 1
Views: 162

Structure stability

Which is more stable? Single bond alkanes? Double bond alkenes? Or alkenes with resonance?
by Anh Khoa 3E
Sun Mar 05, 2017 5:05 pm
Forum: *Alkanes
Topic: Naming the structure
Replies: 3
Views: 354

Naming the structure

H3C-CH=CH-CH2-CH2-CH=CH-CH3

Is this named 2,6-dioctene or octa 2,6-diene or 2,6-octadiene?
by Anh Khoa 3E
Wed Feb 01, 2017 1:52 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Problem 8.9
Replies: 3
Views: 374

Problem 8.9

I know w=-PdeltaV but how do you convert L*atm to Joules?
by Anh Khoa 3E
Mon Jan 30, 2017 1:37 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Chapter 8 Number 77
Replies: 2
Views: 243

Chapter 8 Number 77

The question asks, " Benzene is more stable and less reactive than would be predicted from its Kekulé structures." What is Kekule structure? Why is it less stable than the benzene structure?
by Anh Khoa 3E
Mon Jan 30, 2017 1:20 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Chapter 8 Number 75 b
Replies: 1
Views: 310

Chapter 8 Number 75 b

Why is the C-H enthalpy not taken into consideration in the solution manual? Is it because there are 8 H on reactant side and 8 H on the product side?
by Anh Khoa 3E
Mon Jan 30, 2017 12:12 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Chapter 8 Number 73
Replies: 1
Views: 257

Chapter 8 Number 73

The question ask for bond enthalpy of 3 C2H2 -> C6H6. I understand how the carbon bonds are broken up, but why did the answer did not take into account the C-H bonds?

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