Search found 10 matches

by Theresa 1H
Thu Mar 16, 2017 10:40 am
Forum: *Alkanes
Topic: Naming priorities
Replies: 1
Views: 389

Re: Naming priorities

Yes. First functional groups, then double/triple bonds and then substituents.
by Theresa 1H
Sun Mar 12, 2017 1:34 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Organic Reaction Mechanism [ENDORSED]
Replies: 2
Views: 300

Re: Organic Reaction Mechanism [ENDORSED]

Hi,

I think your question is answered in the post below.

viewtopic.php?t=14336

Hope it helps!
by Theresa 1H
Sun Mar 05, 2017 10:19 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Special Catalysts & Reactions
Replies: 3
Views: 300

Re: Special Catalysts & Reactions

I don't know any, but I think it is relative to the how much energy is needed for the reaction (if it is endothermic). I think we only need to know that Catalyst speed up the reaction by lowering the activation energy, so that more reactant has the energy to overcome the barrier and become the produ...
by Theresa 1H
Mon Feb 27, 2017 12:09 pm
Forum: *Electrophilic Addition
Topic: Example on Page 82 in CR
Replies: 1
Views: 183

Re: Example on Page 82 in CR

The Br with negative charge takes the two electrons in the single bond (shown by the arrow) and becomes Br-.
by Theresa 1H
Mon Feb 27, 2017 12:01 pm
Forum: *Electrophilic Addition
Topic: Relation between standard enthalpy of activation
Replies: 1
Views: 374

Re: Relation between standard enthalpy of activation

Ea= Δ‡H°+RT.

Δ‡H°usually dominate Ea, which is an approximation since Δ‡S° is not taking consideration.

Hope this helps.
by Theresa 1H
Sun Feb 19, 2017 8:10 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Hw 15.35
Replies: 1
Views: 187

Hw 15.35

Hi everyone,

In the solution manual 15.35, they used the equation [A]=[A]0/1+[A]0*kt to get the 2nd order integrated rate law. Is this equation used only to derive the integrated rate law for the 2nd order reaction? Or does it work for all orders (1st and zero order) of reaction?

Thanks!
by Theresa 1H
Mon Feb 06, 2017 8:06 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 14.15 - half reactions and cell diagrams for solubility equilibriums
Replies: 2
Views: 253

Re: 14.15 - half reactions and cell diagrams for solubility equilibriums

Hi,

I am also not sure about 14.15. Especially about part a) of this question. How do you write half equations for equilibrium reactions?

Thanks!
by Theresa 1H
Mon Jan 30, 2017 3:10 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Chapter 9, Question 9.3
Replies: 1
Views: 187

Re: Chapter 9, Question 9.3

Yes, as long as the heat is q(rev). And yes, because the entropy would increase if there is heat added to the system.
by Theresa 1H
Wed Jan 25, 2017 7:16 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 8.99 Heat Capacity
Replies: 1
Views: 234

Re: 8.99 Heat Capacity

The negative sign is used to balance out the negative sign for -20.0KJ.

This is how I interpreted the question:
Since this is an exothermic reaction, 20.0 KJ of energy is released by the reaction. This means 20.0 KJ is supplied as heat (q) into water.
q=20.0KJ=4.184*800*ΔT
ΔT=5.98C

Hope this helps!
by Theresa 1H
Sat Jan 21, 2017 5:11 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Can some explain reversible and irreversible processes? [ENDORSED]
Replies: 2
Views: 312

Re: Can some explain reversible and irreversible processes? [ENDORSED]

Here are the definitions from the textbook: "A reversible process is one that can be reversed by an infinitely small change in a variable. Expansion against an external pressure that differs by a finite (measurable) amount from the pressure of the system is an irreversible process in the sense ...

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