CHEMISTRY COMMUNITY

Rachel Kipp 1I

When doing a flip, all the axial ups become equatorial ups and the axial downs become equatorial downs.

Rachel Kipp 1I

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Rachel Kipp 1I

Why is standard Gibbs free energy of activation always a positive value, in terms of conceptual understanding?

Rachel Kipp 1I

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...

Rachel Kipp 1I

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...

Rachel Kipp 1I

Section 15.16 in the book covers Enzymes

Rachel Kipp 1I

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...

Rachel Kipp 1I

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...

Rachel Kipp 1I

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.

Rachel Kipp 1I

Happy Week 5!

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Rachel Kipp 1I

The equation $\Delta G = -nFE$ shows us that the free energy between the reactants and products ( $\Delta G$ )
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!

Rachel Kipp 1I

Can someone explain the difference between Gibbs free energy and internal energy to better conceptually understand the two?

Rachel Kipp 1I

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...

Rachel Kipp 1I

$\Delta H=\Delta U+P\Delta V$ so $\Delta U = \Delta H - P\Delta V$ and $w = -P\Delta V$ which $= +22kJ$ , since the work is done ON the system. We also know $\Delta H = -15kJ$ from the givens in question 47

Plug in this info and you will get, $-15kJ + 22kJ = \Delta U = +7kJ$

Rachel Kipp 1I

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)

Rachel Kipp 1I

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.

CHEMISTRY COMMUNITY

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Re: How to chair flip?

Re: Excellence in Chemistry Award 2014-15

Standard Gibbs Free Energy of Activation

Re: Chapter 15: Question #99

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

Re: Practice Quiz 2 #9

Re: Homework Question 15.23

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

Re: Question 14.25

Re: Post All Chemistry Jokes Here

Re: max cell potential

Gibbs Free Energy vs. Internal Energy

Re: Textbook Problem 8.21

Re: HW 8.47

Re: Standard Enthalpies of Formation Basics

Re: Calculating Heat Required