Search found 14 matches

by chris2E
Fri Mar 17, 2017 4:20 pm
Forum: *Alkanes
Topic: ORDER OF SUBSTITUENTS
Replies: 2
Views: 613

Re: ORDER OF SUBSTITUENTS

The methyl would be placed before the methylethyl because methyl occurs first alphabetically.
by chris2E
Sun Mar 12, 2017 11:39 pm
Forum: *Alkanes
Topic: 1.18
Replies: 1
Views: 240

Re: 1.18

The bicycloalkane is beyond the scope of what we need to know for Chem 14B, we shouldn't have to worry about naming it until 14C. Also, problem 1.18 isn't one of the listed problems that is recommended, so in terms of preparation for this course you should be fine without it.
by chris2E
Sun Mar 05, 2017 2:13 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2017
Replies: 183
Views: 15868

Re: Quiz 3 Winter 2017

Can someone help me with #3 I don't understand how both of them are nucleophiles? Are you referring to #6? Nucleophiles are species rich in electrons. For the benzene ring, this electron richness comes from its double bonds. For CH_{3}OCH_{3} the oxygen in the center of the compound can only be att...
by chris2E
Wed Mar 01, 2017 11:36 pm
Forum: *Alkanes
Topic: Common Names
Replies: 2
Views: 275

Re: Common Names

They're just for reference, on an exam it'll either explicitly state to give the IUPAC name or it'll simply say to name the compound (in which case either the IUPAC name or common name is acceptable).
by chris2E
Tue Feb 21, 2017 9:27 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 Winter 2017
Replies: 160
Views: 15304

Re: Quiz 2 Winter 2017

Is there a reason why number six's answer has three significant figures despite the given concentration 0.35M having two significant figures? Do we not bother with sig figs when ln is involved?
by chris2E
Mon Feb 20, 2017 2:10 am
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Energy Extensive or Intensive?
Replies: 2
Views: 1587

Re: Energy Extensive or Intensive?

Adding on, some examples of intensive properties include specific heat capacity and standard reduction potential, whereas examples of extensive properties include entropy, enthalpy, and Gibbs free energy. Standard reduction potential E^{\circ} being an intensive property is the reason why for redox ...
by chris2E
Fri Feb 10, 2017 1:41 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Units When Using Bond Enthalpies
Replies: 1
Views: 282

Re: Units When Using Bond Enthalpies

For \Delta H{_{rxn}}^{^{\circ}}^ it's fine for your final answer to be in either kj or kj/mol. Here the mol in kj/mol is only referring to the amount of heat being absorbed or released per mole of reaction . In other words, if the reaction is being carried out with its current stoichiometric coeffic...
by chris2E
Thu Feb 09, 2017 11:16 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Writing Cell Diagram?
Replies: 2
Views: 333

Re: Writing Cell Diagram?

It's convention for the anode to be on the left and the cathode to be on the right, Anode||Cathode. If the cell diagram is given in a problem, or it asks you to construct a cell diagram, then you can assume that the diagram will follow this convention. This is particularly important when given a cel...
by chris2E
Thu Feb 09, 2017 10:59 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 14.11
Replies: 2
Views: 334

Re: 14.11

To add to that, when asked to build a cell diagram, we put inert electrodes such as Pt(s) at both ends whenever both the oxidation and reduction species are in the same solution (for example, when both are aqueous).
by chris2E
Wed Feb 01, 2017 11:01 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 1 Preparation Answers
Replies: 130
Views: 13705

Re: Quiz 1 Preparation Answers

Hi, I had some questions about sig figs.

For #1, shouldn't the answer be 310.J instead of 310J since both 254J and 564J have three significant figures?

For #10, shouldn't the answer be 0.7J/K instead of 0.683J/K since both 200J and 20°C have one significant figure?
by chris2E
Sun Jan 29, 2017 11:44 pm
Forum: Calculating Work of Expansion
Topic: Ideal Gases Formula Pt. 2
Replies: 2
Views: 292

Re: Ideal Gases Formula Pt. 2

If you're looking for a problem that incorporates any of U=3/2nRT; Cv=3/2R; and/or Cp=5/2R, take a look at problem 8.31 in Chapter 8!
by chris2E
Sun Jan 22, 2017 10:08 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpy of H+ protons
Replies: 2
Views: 416

Re: Enthalpy of H+ protons

Could it be because the standard enthalpy of formation of an element in its most stable form is zero, and H+ is in its most stable form because it's only made up of one element?
by chris2E
Sun Jan 22, 2017 9:58 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Ch. 8 Number 31
Replies: 2
Views: 316

Re: Ch. 8 Number 31

There is a table with those values on page 281 in the textbook!
by chris2E
Sun Jan 15, 2017 2:45 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7581
Views: 1013897

Re: Post All Chemistry Jokes Here

Why was the non-metal kicked out of the orchestra?

It was a poor conductor!

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