Search found 31 matches

by Jenny2G
Sun Mar 19, 2017 2:30 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Determining cis, z, trans, or e [ENDORSED]
Replies: 3
Views: 1108

Re: Determining cis, z, trans, or e [ENDORSED]

Cis means same side which is the same as Z while trans means the opposite side which means E. So cis is always Z and trans is always E.
by Jenny2G
Sun Mar 19, 2017 2:29 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: When to Determine Chair Conformation
Replies: 3
Views: 717

Re: When to Determine Chair Conformation

Chair will always be the most stable conformation because it requires less energy. The boat conformation needs more energy due to the flagpole interaction and the pairs of eclipsed Rs.
by Jenny2G
Sun Mar 19, 2017 2:27 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Determining reduction or oxidation
Replies: 4
Views: 589

Re: Determining reduction or oxidation

You need to find the charge on the ion in the reactant and then see the charge change in the product. So if a reactant had cr3+ but had a charge of 2+ in the products it is a reduction because it gained one electron.
by Jenny2G
Sun Mar 19, 2017 2:25 pm
Forum: *Electrophilic Addition
Topic: Drawing the Transition State
Replies: 2
Views: 792

Re: Drawing the Transition State

Transition states are when there are the dashed lines indicating broken or formed bonds. They are the middle state between reactants and products. So if the slow step is the first step the graph will have a higher hump on the first transition step.
by Jenny2G
Mon Mar 13, 2017 2:30 pm
Forum: *Electrophilic Addition
Topic: Attachment of Atoms
Replies: 5
Views: 738

Re: Attachment of Atoms

In the case that you have given no because it both carbons have the same amount of hydrogens bonded to it.
by Jenny2G
Mon Mar 13, 2017 2:27 pm
Forum: *Alcohols
Topic: Functional groups
Replies: 2
Views: 545

Re: Functional groups

Although we only need to know the coursereader ones, it would be a good idea to look at some of the other ones not in the course reader. For instance, if they were used in the textbook practice problems because he likes to use those.
by Jenny2G
Mon Mar 13, 2017 1:03 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Exam points
Replies: 7
Views: 839

Re: Final Exam points

I'm pretty sure you can get all the points because I don't think they will look at every student to see if they posted once a week. I think they would just see how many posts they made.
by Jenny2G
Tue Mar 07, 2017 11:19 pm
Forum: *Cycloalkanes
Topic: 3-Ethyl,1,1-dimethyl-2-propylcyclohexane
Replies: 1
Views: 264

Re: 3-Ethyl,1,1-dimethyl-2-propylcyclohexane

The book explains it. It doesn't start at ethyl because 3,3>1,1. You only assign the lowest numbering to the first alphabetical hydrocarbon when the number total are the same.
by Jenny2G
Tue Mar 07, 2017 11:11 pm
Forum: *Cycloalkenes
Topic: Cyclopentane Naming
Replies: 4
Views: 485

Re: Cyclopentane Naming

Its hard to explain but I think its because you want the smaller numbers. The other way you would have 2,2-dimethyl rather than 1,1-dimethyl. But it's confusing.
by Jenny2G
Tue Mar 07, 2017 11:01 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Section 4.2 Organic Chemistry Textbook
Replies: 1
Views: 273

Re: Section 4.2 Organic Chemistry Textbook

The hydrogen can't go to the middle one because the bromide needs to go to the carbon in the middle in order for the product to have less dipole moment.
by Jenny2G
Tue Mar 07, 2017 10:51 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Quiz 2 Question
Replies: 2
Views: 388

Re: Quiz 2 Question

The show step has two double sided arrows signifying that they can be reversible, one sided arrows means that they are at equilibrium therefore the slow step can have two arrows. It is not possible for the slow step to be at equilibrium.
by Jenny2G
Mon Feb 27, 2017 9:14 pm
Forum: General Rate Laws
Topic: overall rate
Replies: 1
Views: 241

overall rate

I know this is late but when given multiple steps is the overall rate always reliant on the slow step even if the slow step is also the first step and an equilibrium?
by Jenny2G
Tue Feb 21, 2017 5:09 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017216

Re: Post All Chemistry Jokes Here

Q: What do you do with a sick chemist?
A: If you can't helium, and you can't curium, then you might as well barium.
by Jenny2G
Tue Feb 21, 2017 5:08 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017216

Re: Post All Chemistry Jokes Here

I asked the guy sitting next to me if he had any Sodium Hypobromite…
He said NaBrO
by Jenny2G
Sun Feb 12, 2017 10:07 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017216

Re: Post All Chemistry Jokes Here

Q: What do you get when you mix sulfur, tungsten, and silver?
A: SWAG
by Jenny2G
Sat Feb 04, 2017 1:06 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017216

Re: Post All Chemistry Jokes Here

tumblr_mk70xv8o3E1s9q5n2o1_500CF4.jpg
by Jenny2G
Thu Feb 02, 2017 11:28 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Entropy
Replies: 3
Views: 333

Re: Entropy

You should also look for the one with higher degeneracy, the number of ways of getting an energy state. Its basically the different ways you can arrange a Lewis structure.
by Jenny2G
Fri Jan 27, 2017 2:31 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017216

Re: Post All Chemistry Jokes Here

chemistry joke.jpg
by Jenny2G
Wed Jan 25, 2017 10:22 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Example of isolated System
Replies: 4
Views: 2394

Re: Example of isolated System

An example is coffee in a high-quality thermos or a bomb calorimeter.
by Jenny2G
Fri Jan 20, 2017 12:24 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017216

Re: Post All Chemistry Jokes Here

When do chemists tell jokes?
Periodically.
by Jenny2G
Sat Jan 14, 2017 4:58 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1017216

Re: Post All Chemistry Jokes Here

Q: Did you hear about the man who got cooled to absolute zero?
A: He's 0K now.
by Jenny2G
Tue Nov 29, 2016 2:02 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: What does Kc tell us?
Replies: 5
Views: 3568

Re: What does Kc tell us?

Kc stands for the equilibrium constant for concentration.
by Jenny2G
Tue Nov 29, 2016 1:58 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Approximating X
Replies: 2
Views: 442

Re: Approximating X

The explanation is on page 161 on the course reader. You can take X out when you know it is very small, so when K is a very small number. The example Lavelle said in class was that if you have a million dollars and you give away $100 you still have around a million dollars and so when finding the co...
by Jenny2G
Thu Nov 24, 2016 7:47 pm
Forum: Student Social/Study Group
Topic: Help with Coordination Compounds?
Replies: 6
Views: 910

Re: Help with Coordination Compounds?

The name helps but you need to know the charge of each element and which is neutral to find the overall charge. Memorize the chart in the course reader because it shows what is negative and what is neutral.
by Jenny2G
Tue Nov 15, 2016 10:02 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: What is the structure of dien?
Replies: 2
Views: 378

Re: What is the structure of dien?

I don't really understand that. Doesn't that make the nitrogens radical? Also what about the charge? How does the structure translate into plus 2 charge?
by Jenny2G
Mon Nov 07, 2016 1:04 pm
Forum: Administrative Questions and Class Announcements
Topic: Chem 14B and 14BL [ENDORSED]
Replies: 11
Views: 2931

Re: Chem 14B and 14BL [ENDORSED]

I talked to the counselor and she recommended not taking BL until 3rd year for pre-med students because you want to get all the sciences you need for MCAT by the end of 2nd year. That is if you are not taking a gap year.
by Jenny2G
Mon Oct 31, 2016 7:45 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: bond angle
Replies: 3
Views: 427

Re: bond angle

To figure out bond angle just know the molecular shape. Like trigonal bipyramidal have angles of 120, 90, and 180. However, I'm pretty sure you don't need to know bond angles for the midterm however, it would be a good idea to know the names of the molecular shapes as they are in the coursereader ch...
by Jenny2G
Tue Oct 25, 2016 3:06 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Workbook: Quiz 2 Prep #4
Replies: 3
Views: 433

Re: Workbook: Quiz 2 Prep #4

For Cl- you can just do [Ar] because it has the exact same electron configuration. When chloride gains an electron it will have full orbitals like the noble gas argon.
by Jenny2G
Wed Oct 19, 2016 2:53 pm
Forum: Lewis Structures
Topic: Resonance [ENDORSED]
Replies: 5
Views: 529

Re: Resonance [ENDORSED]

When you do a Lewis structure there are different possible bonding pairs like in the NO3- shown on page 5 on chapter 3 in the course reader. Those are resonances.
by Jenny2G
Tue Oct 11, 2016 7:56 am
Forum: Administrative Questions and Class Announcements
Topic: Chemistry Community Points
Replies: 11
Views: 1057

Re: Chemistry Community Points

What if we forget to post a week? Does that negatively affect my grade?
by Jenny2G
Wed Sep 28, 2016 4:10 pm
Forum: Student Social/Study Group
Topic: De Neve Study Group
Replies: 35
Views: 2249

Re: De Neve Study Group

Yes! I live in Birch though.....

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