Search found 17 matches

by alondra_1D
Thu Mar 16, 2017 3:49 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Thermodynamically/ kinetically stable
Replies: 2
Views: 338

Thermodynamically/ kinetically stable

What is the difference between kinetic stability and thermodynamic stability?
by alondra_1D
Sat Mar 11, 2017 2:32 pm
Forum: *Ketones
Topic: SN2 Transition State geometry. [ENDORSED]
Replies: 1
Views: 923

SN2 Transition State geometry. [ENDORSED]

Is the transition state geometry for the SN2 reaction always trigonal bipyramidal?

so far all the questions regarding its transition state geometry have been like this.
by alondra_1D
Wed Mar 08, 2017 6:16 pm
Forum: *Alkynes
Topic: Double or Triple bonds?
Replies: 2
Views: 643

Double or Triple bonds?

if a line structure has both a double and triple bond, which one would we give priority to when naming the compound?
by alondra_1D
Sat Mar 04, 2017 10:27 am
Forum: *Free Energy of Activation vs Activation Energy
Topic: homework 4.30 [ENDORSED]
Replies: 2
Views: 469

homework 4.30 [ENDORSED]

QUESTION: (4.30) The activation energy,Ea in an organic reaction known to be 125 kJ/mol will this reaction occur at room temperature? Is the answer to this no because the delta G naught is positive, thus it is unfavorable? Does the high value, 125kJ/mol also have something to do with the answer bein...
by alondra_1D
Wed Mar 01, 2017 6:48 pm
Forum: *Alkanes
Topic: Naming
Replies: 2
Views: 369

Naming

When giving the hybridization, geometry and Shape of organic molecules, do we not include the lone pairs?
by alondra_1D
Sun Feb 26, 2017 11:00 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: k'
Replies: 4
Views: 626

Re: k'

Yea, k' is just the reverse reaction, I don't know what else we would use it with besides, K=k/k'.
by alondra_1D
Sat Feb 18, 2017 4:15 pm
Forum: General Rate Laws
Topic: 15.9 [ENDORSED]
Replies: 4
Views: 503

Re: 15.9 [ENDORSED]

In the textbook page 620, the units for the rate constants are given.
by alondra_1D
Sat Feb 18, 2017 11:54 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: QUIZ 2 #11
Replies: 3
Views: 370

QUIZ 2 #11

The rate constant for the reaction A\rightarrow B is 25 /min at 298K and 35/min at 350 K. Calculate the value of the rate constant at 770K. Give your answer in min^-1 De we first use this equation, ln\frac{k2}{k1}=\tfrac{Ea}{R}\cdot (\frac{1}{T1}-\frac{1}{T2}) and get the Value of Ea and the...
by alondra_1D
Thu Feb 16, 2017 4:17 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Homework 15. 63
Replies: 1
Views: 497

Homework 15. 63

The rate constant of the reaction between CO2 and OH in aqueous solution to give the HCO3 ion is 1.5 1010 L mol 1 s 1 at 25 C. Determine the rate constant at blood temperature (37 C), given that the activation energy for the reaction is 38 kJ mol 1. Isn't k= k/k'? why did the solutions manual have k...
by alondra_1D
Wed Feb 15, 2017 4:13 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Winter Midterm 2014 QB
Replies: 3
Views: 446

Re: Winter Midterm 2014 QB

I assumed it was hexane because it has a more complicated structure, but I am not 100% on this.
by alondra_1D
Sat Feb 11, 2017 12:27 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Reducing agents [ENDORSED]
Replies: 2
Views: 360

Reducing agents [ENDORSED]

When we are arranging the following metals , Cu, Zn, Cr, Fe in order of increasing strength as reducing agents for species in aqueous solutions,

the stronger ones are the ones with the most negative values right?
by alondra_1D
Thu Feb 02, 2017 10:37 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: 14.23
Replies: 2
Views: 433

14.23

For each reaction that is spontaneous under standard conditions, write a cell diagram, determine the standard cell potential, and calculate delta G for the reaction: (a) 2NO_{3}^-(aq)+8H^+(aq)+6Hg(l)\rightarrow 3Hg_{2}^{2+}(aq)+2NO(g)+4H_{2}O(l) how do...
by alondra_1D
Thu Feb 02, 2017 10:26 pm
Forum: Balancing Redox Reactions
Topic: 14.13
Replies: 3
Views: 236

Re: 14.13

Hello Alondra, The simplest answer is you should look at the difference in E^{\circ}_{cell} between both reactions. So if we look, we note that one has a E^{\circ}_{cell} of +1.69 V and the other has a E^{\circ}_{cell} of +1.40V. Because we need to make the charge as positive as possible, we will h...
by alondra_1D
Thu Feb 02, 2017 5:28 pm
Forum: Balancing Redox Reactions
Topic: 14.13
Replies: 3
Views: 236

14.13

Write the half-reaction, the balanced equation for the cell reaction, and the cell diagram for each of the following skeletal equations d) Au+(aq) --> Au(s) + Au3+(aq) for the anode half reaction why is the answer : Au(s) --> Au3(aq)+ 3e- and not Au+ why do we use Au(s) instead of Au+(aq)??
by alondra_1D
Fri Jan 27, 2017 6:20 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: 9.81
Replies: 1
Views: 253

9.81

For 9.81 When it asks us to justify our selection between which two molecules are more stable can we say that Fe2O3 is more stable because its holds less atoms in contrast to which Fe3o4 holds more?
Since they are both are solids I figures that the less complex one would be more stable?
by alondra_1D
Sun Jan 22, 2017 12:27 am
Forum: Phase Changes & Related Calculations
Topic: 8.117 [ENDORSED]
Replies: 1
Views: 261

8.117 [ENDORSED]

Why do we subtract 1.65 kJ from -106 kJ when calculating the internal energy for the production of 1 mol of H2 (g)?
by alondra_1D
Thu Jan 12, 2017 6:40 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Problem 8.49
Replies: 4
Views: 319

Re: Problem 8.49

I have another question regarding this problem,

do we assume that the temperature is 298.15K because 25 degrees celsius is most commonly used?

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