Search found 10 matches

by Mark Libowitz 2K
Thu Mar 10, 2016 2:04 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1213850

Re: Chemistry Jokes

Image

This is a good one!
by Mark Libowitz 2K
Sun Mar 06, 2016 8:56 pm
Forum: *Alkanes
Topic: Functional Groups
Replies: 1
Views: 216

Re: Functional Groups

From my understanding we will not need to know the priorities of functional groups based on what was said during lecture. I would ask him in class though and maybe update this thread so people could see...
by Mark Libowitz 2K
Sun Mar 06, 2016 8:52 pm
Forum: *Alkynes
Topic: Both an alkyne and alkane
Replies: 1
Views: 745

Re: Both an alkyne and alkane

Double bond takes precedent. It is an alkyne.
by Mark Libowitz 2K
Mon Feb 29, 2016 5:43 pm
Forum: *Electrophilic Addition
Topic: How many intermediates are there in electrophilic additions?
Replies: 5
Views: 746

Re: How many intermediates are there in electrophilic additi

It is a two step equation so there would be two intermediates and two transition states.
by Mark Libowitz 2K
Mon Feb 29, 2016 5:40 pm
Forum: *Alkanes
Topic: Difference between Neopentyl and Tert-butyl
Replies: 1
Views: 272

Re: Difference between Neopentyl and Tert-butyl

In tert-groups the carbon is located on the cross. In neo-groups the carbon is located past the cross.
by Mark Libowitz 2K
Thu Feb 18, 2016 7:56 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Partial charges
Replies: 1
Views: 269

Re: Partial charges

If it is polar it will have regions of partial and negative charge.
I.E. H2O

Oxygen is more negative and Hydrogen is more positive generally
by Mark Libowitz 2K
Wed Feb 17, 2016 5:42 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Mid term sig figs
Replies: 1
Views: 281

Re: Mid term sig figs

There should be three significant figures

1.20V
by Mark Libowitz 2K
Sat Jan 23, 2016 5:24 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Homework Question 8.11 (Reversible vs. Irreversible)
Replies: 1
Views: 222

Re: Homework Question 8.11 (Reversible vs. Irreversible)

When doing part A you use w=-P*deltaV. This gives you -1.20 atm*L or -121.59 J. But when you calculate reversible expansion you use the formula w = -nRTln(V2/V1) giving you -343.6 J. You use that formula by definition for reversible expansion, because of the infinetley small changes or "infinit...
by Mark Libowitz 2K
Mon Jan 18, 2016 4:41 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: calculating work (w)
Replies: 1
Views: 211

Re: calculating work (w)

You could write your answer in any unit, but usually use kilo joules if it is in the thousands. Unless the question specifically asks for a specific unit of measurement I don't think it would matter assuming your answer is correct.
by Mark Libowitz 2K
Sat Jan 09, 2016 10:21 pm
Forum: Phase Changes & Related Calculations
Topic: State Properties
Replies: 1
Views: 209

Re: State Properties

Two examples of properties that are not state properties are Work (w) and Heat (q). For a state property such as temperature the initial and final value are all that matter i.e. if the initial temperature is 50°C then it moves to 60°C and then its final temperature is 70°C. The change in temperature...

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