Search found 10 matches

by VinayK 2B
Sun Mar 13, 2016 11:08 pm
Forum: *Cycloalkanes
Topic: Winter Final 2012 Question 6B
Replies: 3
Views: 645

Re: Winter Final 2012 Question 6B

A neo group is a group that has three methyl groups at the end and AT LEAST five carbons total, ie there is a secondary carbon connecting the branching side chain to the main chain. A tert-butyl group is a branching side chain that contains three methyls at the end and connects to the main chain via...
by VinayK 2B
Sun Mar 06, 2016 10:02 pm
Forum: *Alkanes
Topic: Tert vs Neo
Replies: 1
Views: 275

Re: Tert vs Neo

The neo- group is used when there are 3 methyl groups attached to a carbon and at least 5 total carbons in the molecule. Usually, a secondary carbon is connected to both the branch chain and the main chain in this situation. The tert-butyl name is used when the 3 methyl groups attached to a carbon, ...
by VinayK 2B
Mon Feb 29, 2016 1:30 am
Forum: *Alkanes
Topic: using the sum rule?
Replies: 2
Views: 294

Re: using the sum rule?

As far as I'm aware, there is no sum rule. You're generally looking for the smallest numbers on the first carbon molecule. In the case you described, I can't quite say for certain, but say that for the 1-8-9 you started the first carbon at the 9. This would make the numbers 1-2-9, which is better th...
by VinayK 2B
Sun Feb 21, 2016 3:31 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalysts
Replies: 2
Views: 424

Re: Catalysts

What generally happens is that the initial group of reactants are adsorbed onto the catalyst, and then proceed to have some sort of interaction, resulting in the reaction occurring at a faster rate. Then, the products are desorbed. This means that the products leave the catalyst, providing space for...
by VinayK 2B
Tue Feb 16, 2016 10:20 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Forward/Reverse reaction rates
Replies: 1
Views: 276

Re: Forward/Reverse reaction rates

No, as far as I'm aware, that was only used for the sake of an example. In most situations, you'll probably be given the order of the reaction.
by VinayK 2B
Sun Feb 07, 2016 11:58 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Closed and Isolated?
Replies: 2
Views: 405

Re: Closed and Isolated?

A closed system is one that allows transfer of energy, aka something that you can heat. A closed cup allows energy to be transferred inside. An isolated system is something that allows no energy to enter. This is something like isothermic container.
by VinayK 2B
Mon Feb 01, 2016 1:01 am
Forum: Balancing Redox Reactions
Topic: REDOX reaction addition of water
Replies: 2
Views: 391

Re: REDOX reaction addition of water

So, if you refer to the back of the book for the redox reactions, you'll see the two half reactions used.

2 HClO + 2 H+ + 2 e- --> Cl2 + 2 H2O

and
Cl2 + 2 e- --> 2 Cl

The first half reaction is where the water comes into the equation.
by VinayK 2B
Mon Jan 25, 2016 7:22 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Reaction Enthalpies Confusion
Replies: 1
Views: 274

Re: Reaction Enthalpies Confusion

I think you may have read the first example incorrectly. On page 18, the course reader states that you an find the delta H for the reaction by adding the energy required to form bonds and adding the energy required to break bonds. Breaking bonds is negative, while forming bonds is positive. Because ...
by VinayK 2B
Sun Jan 17, 2016 11:21 pm
Forum: Phase Changes & Related Calculations
Topic: Work equation
Replies: 2
Views: 444

Re: Work equation

To answer your first question, the work equation is PV=W. There is no negative sign. However you can get a negative change in volume resulting in "negative work". This is due to the delta before V, representing change in volume. You might be mixing this idea up with the one representing ch...
by VinayK 2B
Sun Jan 10, 2016 5:17 pm
Forum: Phase Changes & Related Calculations
Topic: Formula for sublimation enthalpy
Replies: 3
Views: 9141

Re: Formula for sublimation enthalpy

You are correct in stating that a substance that changes directly from its solid form to its gaseous form (vapor) is considered sublimation. The reason why enthalpy of fusion is used to calculate the enthalpy of sublimation is because of the process type. Sublimation is an endothermic process, simil...

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