Search found 10 matches

by Derek_Petrosian_3I
Wed Mar 15, 2017 6:56 pm
Forum: *Alkenes
Topic: Question 2.47 in the Organic Chemistry Textbook
Replies: 1
Views: 478

Question 2.47 in the Organic Chemistry Textbook

The question asks to identify all the functional groups present in a given molecule. The answer key has "alkene" as one of the functional groups.

Are alkenes and alkynes really counted as functional groups?
by Derek_Petrosian_3I
Tue Mar 07, 2017 12:29 pm
Forum: *Cycloalkanes
Topic: Question 1.16 in the Organic Textbook
Replies: 1
Views: 181

Question 1.16 in the Organic Textbook

The answer key says that the compound should be named 2-Isopropyl-1,1-dimethylcyclopentane

Would it also be correct to name the compound 1,1-dimethyl-2-sec-propylcyclopentane?
by Derek_Petrosian_3I
Thu Mar 02, 2017 11:59 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2017
Replies: 183
Views: 15896

Re: Quiz 3 Winter 2017

Sarai_Ferrer_3C wrote:Will we be given solutions for the practice quiz #3?


Yes, solutions to practice quiz #3 will be posted in a couple of days. The answers to the last quiz were posted on the Saturday before the quiz.
by Derek_Petrosian_3I
Thu Feb 23, 2017 12:15 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 Winter 2017
Replies: 160
Views: 15320

Re: Quiz 2 Winter 2017

Can somebody explain to me why 10 on the quiz 2 prep is false? This reaction is second order because you are given k=[A]^2. If you look at the equation we derived in class for the half-life of a second order reacion (which is also on the formula sheet), you will find t(1/2) = 1/(k*[A] initial). Thi...
by Derek_Petrosian_3I
Tue Feb 14, 2017 11:35 am
Forum: Administrative Questions and Class Announcements
Topic: Midterm Winter 2017
Replies: 87
Views: 14474

Re: Midterm Winter 2017

For Practice Midterm 2013, question 5b asks to "arrange the following substances in order of increasing standard molar entropy: CHF3, CF4, CH3F, CH2F2" The answer says CH3F<CH2F2<<CHF3<CF4 This seems incorrect, as CF4 should have the least molar entropy and CH2F2 should have the greatest (...
by Derek_Petrosian_3I
Thu Feb 09, 2017 10:02 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Trouton's rule
Replies: 4
Views: 584

Re: Trouton's rule

Trouton's Rule is the observation that many values of standard entropies of vaporization of liquids are close to 85 J/mol*K. An example of where you can use this is when you are asked to find the approximate standard enthalpy of vaporization of a liquid. Let’s say you want to find the standard entha...
by Derek_Petrosian_3I
Wed Feb 01, 2017 10:11 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 1 Preparation Answers
Replies: 130
Views: 13730

Re: Quiz 1 Preparation Answers

In the email we received about information on significant figures, I came across this: "When your calculation involves more than one operation, you will need to follow the standard order of operations. You may have learned the order of operations as PEMDAS (parentheses, then exponents, then mul...
by Derek_Petrosian_3I
Tue Jan 24, 2017 7:35 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Trouton's Rule [ENDORSED]
Replies: 1
Views: 463

Trouton's Rule [ENDORSED]

According to the book, Trouton's rule is the observation that many enthalpies of vaporization for liquids are close to 85 kJ/mol*K. Self-test 9.7A on page 328 asks to estimate the standard enthalpy of vaporization of liquid bromine, which boils at 59 degrees Celsius, using Trouton's rule. How is thi...
by Derek_Petrosian_3I
Wed Jan 18, 2017 2:14 pm
Forum: Calculating Work of Expansion
Topic: HW Problem 8.93
Replies: 1
Views: 259

HW Problem 8.93

a) Calculate the work that must be done against the atmosphere for the expansion of the gaseous products in the combustion of 1.00 mol C6H6 (l) at 25 degrees Celsius and 1 bar. In the solutions manual, the products of this combustion are CO2 gas and liquid water. Why is water liquid here and not gas?
by Derek_Petrosian_3I
Wed Jan 11, 2017 10:38 pm
Forum: Calculating Work of Expansion
Topic: Self Test 8.1A on page 264
Replies: 1
Views: 195

Self Test 8.1A on page 264

I have a question about Self Test 8.1A on page 264. I used volume = mass/density to find the volume of water and ice. 100g/1.00 g/cm^-3 = 100cm^-3 = 100mL = 0.001L (water) 100g/0.92g/cm^-3 = 108.7cm^-3 = 108.7mL = 0.001087L (ice) delta V = V(final) - V(initial) = V (ice) - V(water) delta V = 0.00108...

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