Search found 17 matches

by haleh matinrad 1C
Sun Mar 19, 2017 10:23 am
Forum: *Cycloalkanes
Topic: Final 2013 Q6 - Numbering
Replies: 3
Views: 846

Re: Final 2013 Q6 - Numbering

Hi everyone! Can anyone explain why the methyls of the cyclohexane in Question 6A of the 2013 Final are numbered 1,5,5,6 and not 1,2,3,3? It's because you have a double bond. When you have a double or a triple bond, you must count going across across the bond. You started at the double bond, but th...
by haleh matinrad 1C
Thu Mar 16, 2017 7:33 pm
Forum: *Carboxylic Acids
Topic: saturated, unsaturated fats, etc.
Replies: 1
Views: 806

saturated, unsaturated fats, etc.

Will we have to know about saturated, unsaturated, polyunsaturated fats, etc. for the final since it is in the section to read in the syllabus however we never went over it in class
by haleh matinrad 1C
Thu Mar 16, 2017 3:59 pm
Forum: *Haloalkanes
Topic: priority of double/triple with a halogenated compound
Replies: 1
Views: 679

priority of double/triple with a halogenated compound

When there is a double or triple bond as well as a halogen, does the double/triple bond take priority when naming because the halogen is treated like a substituent? Is the double/triple bond actually prioritized or am I mistaken? I know a functional group takes priority over double/triple bonds howe...
by haleh matinrad 1C
Sat Mar 11, 2017 4:04 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: gauche and anti
Replies: 1
Views: 356

gauche and anti

Are there anymore low energy conformations for molecules other than the gauche and anti states?
by haleh matinrad 1C
Sun Mar 05, 2017 3:33 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2017
Replies: 183
Views: 20227

Re: Quiz 3 Winter 2017

Could someone explain number 5? It is an electrophilic addition reaction because you are adding the HBr to the cholesterol. HBr when broken up has H+ as an electrophile and Br- as a nucleophile. There are two steps because first you add the H+ to the cholesterol then in the second step you add the ...
by haleh matinrad 1C
Sun Mar 05, 2017 12:21 pm
Forum: *Free Energy of Activation vs Activation Energy
Topic: exergonic vs exothermic
Replies: 2
Views: 835

exergonic vs exothermic

What is the difference between a reaction being exergonic and a reaction being exothermic? Does a reaction being exothermic mean that it is exergonic and vice versa?
by haleh matinrad 1C
Tue Feb 28, 2017 4:34 pm
Forum: Administrative Questions and Class Announcements
Topic: quiz 2
Replies: 1
Views: 274

quiz 2

What was the class average for quiz 2?
by haleh matinrad 1C
Sun Feb 26, 2017 11:58 pm
Forum: *Nucleophiles
Topic: strength of nucleophiles vs basicity
Replies: 2
Views: 338

Re: strength of nucleophiles vs basicity

To my understanding there is no direct general trend for them. Its just the fact that negatively charged species tend to be basic. It's important to remember that the strength of a nucleophile is relative to the reaction it is taking place in.
by haleh matinrad 1C
Sat Feb 25, 2017 5:49 pm
Forum: *Electrophiles
Topic: electrophiles turns into nucleophile [ENDORSED]
Replies: 1
Views: 308

electrophiles turns into nucleophile [ENDORSED]

Will there ever be a situation where one molecule or atom that was an electrophile could act as a nucleophile or vice versa?
by haleh matinrad 1C
Sat Feb 11, 2017 9:59 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 14.31 [ENDORSED]
Replies: 3
Views: 604

Re: 14.31 [ENDORSED]

Yes Enot should be positive in order for it to be a spontaneous reaction.
by haleh matinrad 1C
Sat Feb 11, 2017 2:14 pm
Forum: Balancing Redox Reactions
Topic: highest possible charge [ENDORSED]
Replies: 3
Views: 444

Re: highest possible charge [ENDORSED]

A higher voltage means it is more likely to be reduced which means that yes, it is a better oxidizing agent.
by haleh matinrad 1C
Sat Feb 11, 2017 2:11 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: calculating n [ENDORSED]
Replies: 1
Views: 223

calculating n [ENDORSED]

Is there a quicker way of determining n (the number of electrons) than writing out and balancing the half reactions?
by haleh matinrad 1C
Sat Feb 11, 2017 2:09 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: reversible reaction [ENDORSED]
Replies: 1
Views: 247

reversible reaction [ENDORSED]

How do you write the half reactions and devise a galvanic cell for a reversible reaction? For example when given: AgBr(s) double arrows Ag(+)(aq) + Br(-)(aq) Is it the same as usual?
by haleh matinrad 1C
Sat Jan 28, 2017 6:13 pm
Forum: Phase Changes & Related Calculations
Topic: Phase Changes
Replies: 2
Views: 371

Re: Phase Changes

It's because the heat being added is used to to break bonds and other things like that so the temperature isn't going up until all bonds are broken.
by haleh matinrad 1C
Thu Jan 19, 2017 2:21 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: which bonds to break/form [ENDORSED]
Replies: 2
Views: 360

which bonds to break/form [ENDORSED]

When using bond enthalpies to calculate the standard enthalpy of reaction, can you calculate breaking and forming all bonds in the equation? I know this would take an excessively long time but would you get the same result doing this as you would breaking and forming the minimum number of bonds requ...
by haleh matinrad 1C
Thu Jan 12, 2017 2:03 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: standard reaction enthalpy
Replies: 2
Views: 304

standard reaction enthalpy

Since the course reader says that most reactions are given in their standard state, are there specific reactions that are not given in their standard state? Or is it rare enough that it is not an issue?
by haleh matinrad 1C
Thu Jan 12, 2017 1:38 pm
Forum: General Science Questions
Topic: Intro to Organic Chemistry
Replies: 9
Views: 1344

Re: Intro to Organic Chemistry

I've also heard it's supplemental but that we won't be using it until the last portion of the quarter since 14C is organic chemistry

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