Search found 16 matches

by Rachel Kipp 1I
Wed Mar 15, 2017 8:17 pm
Forum: *Cyclopropanes and Cyclobutanes
Topic: How to chair flip?
Replies: 1
Views: 515

Re: How to chair flip?

When doing a flip, all the axial ups become equatorial ups and the axial downs become equatorial downs.
by Rachel Kipp 1I
Thu Mar 09, 2017 10:53 am
Forum: *Free Energy of Activation vs Activation Energy
Topic: Standard Gibbs Free Energy of Activation
Replies: 1
Views: 645

Standard Gibbs Free Energy of Activation

Why is standard Gibbs free energy of activation always a positive value, in terms of conceptual understanding?
by Rachel Kipp 1I
Sun Mar 05, 2017 8:58 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Chapter 15: Question #99
Replies: 1
Views: 223

Re: Chapter 15: Question #99

For a majority of these, you can look at the corresponding formula on the formula sheet, and if the formula is in a y=mx+b form, you know it will be linear. For instance, B is linear because [R]=-kt + [R](initial) because this fits the y=mx+b form for [R] against time regarding a zero-order reaction...
by Rachel Kipp 1I
Sun Feb 26, 2017 7:40 pm
Forum: *Organic Reaction Mechanisms in General
Topic: "No charge separation" meaning? [ENDORSED]
Replies: 3
Views: 2693

Re: "No charge separation" meaning? [ENDORSED]

Recall from Chem 14A the concepts of Resonance and Formal Charge. The better resonance structure would have the lower formal charge. Formal charge is calculated by (# of Valence Electrons) - (# of non-bonding electrons + ((1/2)(bonding electrons)). So the no charge separation refers to the resonance...
by Rachel Kipp 1I
Thu Feb 23, 2017 11:08 am
Forum: First Order Reactions
Topic: Practice Quiz 2 #9
Replies: 1
Views: 316

Re: Practice Quiz 2 #9

Section 15.16 in the book covers Enzymes
by Rachel Kipp 1I
Thu Feb 23, 2017 11:06 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: Homework Question 15.23
Replies: 1
Views: 204

Re: Homework Question 15.23

We use stoichiometry to find our concentration of A. The reaction is 2A \rightarrow B + C We can find the final concentration of A since we are given the final concentration of B. So, .034mol B/L * (2 mol A/1 mol B)=.068 mol of A. Since we know our initial amount of A was 0.153 mol, we subtract 0.15...
by Rachel Kipp 1I
Sat Feb 18, 2017 9:59 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Rate of Reaction vs. Reaction Rate Constant [ENDORSED]
Replies: 2
Views: 278

Re: Rate of Reaction vs. Reaction Rate Constant [ENDORSED]

The rate of reaction tells us how the rate is related to concentrations, since by definition it is a change in concentration of reactants over time, while the reaction rate constant depends on temperature and activation energy, which is why we can calculate the reaction rate constant using any conce...
by Rachel Kipp 1I
Sun Feb 12, 2017 12:14 am
Forum: Balancing Redox Reactions
Topic: Question 14.25
Replies: 2
Views: 235

Re: Question 14.25

For this question, look in appendix 2B and look for the most negative standard reduction potentials. Since we subtract cathode - anode, we want the most negative standard reduction potential in order to have a more positive E and therefore stronger reducing agent.
by Rachel Kipp 1I
Sun Feb 05, 2017 6:30 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019897

Re: Post All Chemistry Jokes Here

Happy Week 5!

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by Rachel Kipp 1I
Sun Feb 05, 2017 6:13 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: max cell potential
Replies: 1
Views: 257

Re: max cell potential

The equation shows us that the free energy between the reactants and products ()
is directly related to the maximum cell potential (E). If you want to better understand how this equation is derived, page 49 in the course reader shows us in a lot of detail!
by Rachel Kipp 1I
Fri Jan 27, 2017 1:52 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy vs. Internal Energy
Replies: 1
Views: 433

Gibbs Free Energy vs. Internal Energy

Can someone explain the difference between Gibbs free energy and internal energy to better conceptually understand the two?
by Rachel Kipp 1I
Sun Jan 22, 2017 2:40 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Textbook Problem 8.21
Replies: 2
Views: 328

Re: Textbook Problem 8.21

Keep in mind that q(system)+q(surroundings) = q(universe), which = 0 So, the heat lost by the metal = - heat gained by the water You can use q=mC(s)(T(final) - T(initial)) in place of the metal and the water, as seen with the set up of the equation above. Plug in the information given, then you will...
by Rachel Kipp 1I
Sun Jan 22, 2017 2:30 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: HW 8.47
Replies: 2
Views: 321

Re: HW 8.47

so and which , since the work is done ON the system. We also know from the givens in question 47

Plug in this info and you will get,
by Rachel Kipp 1I
Fri Jan 13, 2017 10:10 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Enthalpies of Formation Basics
Replies: 2
Views: 258

Re: Standard Enthalpies of Formation Basics

A helpful way to remember the diatomic molecules is with the following saying: Have No Fear Of Ice Cold Beer

H=H2
N=N2
F=F2
O=O2
I=I2 (solid)
C=Cl2
B=Br2 (liquid)
by Rachel Kipp 1I
Fri Jan 13, 2017 9:58 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Calculating Heat Required
Replies: 3
Views: 448

Re: Calculating Heat Required

Note the Qp and just the Q in the second equation. The first equation takes into account constant pressure, while Q in the second equation is heat that is not at constant pressure.

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