Search found 14 matches

by Natalie_Boyd_1C
Sun Feb 26, 2017 4:54 pm
Forum: *Organic Reaction Mechanisms in General
Topic: How does Reaction Mechanism in more detail?
Replies: 1
Views: 268

Re: How does Reaction Mechanism in more detail?

I'm just going to go over this page generally and if you have any more questions I'll try to answer them as best as I can. Things to know: 1. A straight arrow indicates a reaction, while a curved arrow indicates the movement of electrons a. Where the arrow starts is the source of the electrons, whil...
by Natalie_Boyd_1C
Sun Feb 26, 2017 1:40 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7610
Views: 1020388

Re: Post All Chemistry Jokes Here

IMG_5486.PNG
by Natalie_Boyd_1C
Fri Feb 17, 2017 2:55 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7610
Views: 1020388

Re: Post All Chemistry Jokes Here

large.jpg
by Natalie_Boyd_1C
Fri Feb 17, 2017 2:52 am
Forum: First Order Reactions
Topic: First vs. Second Order
Replies: 7
Views: 846

Re: First vs. Second Order

We've talked about which direction a reaction will go based on the concentrations given (i.e. we've talked about le chatelier's principle), and so now we're exploring how the speed of the reaction changes by changing the concentrations of the reactants. A rate law mathematically describes how the co...
by Natalie_Boyd_1C
Fri Feb 10, 2017 12:32 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7610
Views: 1020388

Re: Post All Chemistry Jokes Here

c508769a8282fcf81ef441770bb2e5be.jpeg
by Natalie_Boyd_1C
Fri Feb 10, 2017 12:30 am
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Quiz Question:Calculating delta H--amino acid bonds
Replies: 2
Views: 402

Re: Quiz Question:Calculating delta H--amino acid bonds

The easiest way to do this problem is to cancel out bonds on the two sides of the reactions. What you're looking to do is to look only at what is new: which bonds are being broken, and which ones are being formed. All bonds that are formed release energy. This is because the molecule goes to a lower...
by Natalie_Boyd_1C
Sat Feb 04, 2017 5:58 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7610
Views: 1020388

Re: Post All Chemistry Jokes Here

what-kind-of-dogs-do-chemists-have.jpg
by Natalie_Boyd_1C
Sat Feb 04, 2017 5:55 pm
Forum: Balancing Redox Reactions
Topic: Blancing redox [ENDORSED]
Replies: 2
Views: 299

Re: Blancing redox [ENDORSED]

If you need a refresher on determining oxidation numbers: http://www.wikihow.com/Find-Oxidation-Numbers I'm just going to do the whole problem in case someone else doesn't understand why Cl2 is being reduced as well. EQ: H2S(aq) + Cl2(g) --> S(s) + Cl^(-)(aq) First, let's determine all of the oxidat...
by Natalie_Boyd_1C
Fri Jan 27, 2017 11:06 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7610
Views: 1020388

Re: Post All Chemistry Jokes Here

20150119_195957_.jpg
20150119_195957_.jpg (19.33 KiB) Viewed 5355 times
by Natalie_Boyd_1C
Fri Jan 27, 2017 11:03 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Quiz Preparation
Replies: 3
Views: 402

Re: Quiz Preparation

I've never had him either, but... this might help. Thus far, the equations we have used are: enthalpy: 1.definition of enthalpy: delta H= q p = 2. delta H= H products - H reactants -->Phase Changes: 3. enthalpy of vaporization: delta H vaporization = H vapor - H liquid 4. enthalpy of fusion: delta H...
by Natalie_Boyd_1C
Sat Jan 21, 2017 9:32 pm
Forum: Administrative Questions and Class Announcements
Topic: Chem 14B Course reader
Replies: 3
Views: 577

Re: Chem 14B Course reader

I find that the course reader is a good way to enhance what you absorb in lecture. I.e. it makes taking lecture notes easier because you're not scrambling to write everything down. If you don't have that problem, though, you probably do not need a course reader, although I personally find it pretty ...
by Natalie_Boyd_1C
Sat Jan 21, 2017 9:28 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Bond Enthalpies [ENDORSED]
Replies: 1
Views: 217

Re: Bond Enthalpies [ENDORSED]

I think you probably need to draw a Lewis dot structure to figure out what bonds a molecule has, unless you memorize the bonds for a particular molecule. I.e. you probably don't have to draw a Lewis structure for O2, because it's been drawn a lot in class, and we know it has a double bond.
by Natalie_Boyd_1C
Sun Jan 15, 2017 9:58 pm
Forum: Phase Changes & Related Calculations
Topic: Calculating Enthalpy Changes Using Hess's Law
Replies: 1
Views: 174

Re: Calculating Enthalpy Changes Using Hess's Law

Some of the products and reactants get canceled out because they are used up in the reaction. The example the course reader uses for Hess's Law is: N2 + O2 ---> 2NO + 2NO + O2 ---> 2NO2 2NO is the product of the first equation, but it is the reactant of the second equation. The second reaction basic...
by Natalie_Boyd_1C
Wed Jan 11, 2017 2:53 pm
Forum: Administrative Questions and Class Announcements
Topic: Weekly Online Discussion
Replies: 6
Views: 815

Weekly Online Discussion

I've never had Prof Lavelle before. In the syllabus it says that there is 1 point per week for something called "Weekly Online Discussion". What is that and how do I do it?

Thanks!

Go to advanced search