Search found 20 matches

by Amir Patel 1G
Fri Mar 17, 2017 11:47 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Calculating Work
Replies: 1
Views: 241

Re: Calculating Work

If you're referring to question 2b from Quiz 1, you can use the formula W = -nRTln(v2/v1) and plug in the given values, as indicated by the information on Course Reader p. 31.
by Amir Patel 1G
Fri Mar 10, 2017 10:38 am
Forum: *Alkanes
Topic: Reaction Profiles
Replies: 3
Views: 360

Re: Reaction Profiles

This can also be distinguished by a positive or negative standard reaction Gibbs free energy value. If this value is negative, it is a favorable exergonic reaction. If the value is positive, there is an unfavorable endergonic reaction.
by Amir Patel 1G
Wed Mar 01, 2017 10:12 pm
Forum: *Electrophiles
Topic: Examples of electrophiles in course reader
Replies: 1
Views: 400

Re: Examples of electrophiles in course reader

Alkyl halides are compounds where the H atoms normally bonded to C are replaced by halogens, so CH3Cl, CH2Cl2, CH3Br, etc.

Carbonyls are compounds that have CO functional groups replace H atoms, so (CH3)2CO, CH3CO, CH2(CO)2, etc.
by Amir Patel 1G
Sun Feb 26, 2017 6:06 pm
Forum: *Cycloalkenes
Topic: Self test 1.11A question b
Replies: 1
Views: 241

Re: Self test 1.11A question b

On page 28, it says carbon numbering is first determined by the double bond, then by the alkyl substituents. So the numbering of the carbon bonds goes counterclockwise so that the double bonds include the lower numbered carbon atoms (1-2 and 4-5) and the functional group also still included the lowe...
by Amir Patel 1G
Tue Feb 14, 2017 5:54 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 1
Replies: 5
Views: 579

Re: Quiz 1

Dr. Lavelle waits until the end of the quarter when the scores from the 3 quizzes, midterm, online discussion, and final are totaled up (out of 400 points) and assigns grades based on the class average.
by Amir Patel 1G
Wed Feb 08, 2017 12:04 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Winter 2015 Midterm question 2and 3c
Replies: 2
Views: 402

Re: Winter 2015 Midterm question 2and 3c

In part B, 84 kJ/mol was the enthalpy of the reaction for 2 moles of H2O, so 42 kJ/mol is the standard enthalpy for 1 mole of H2O, which you would then use as the value of standard enthalpy in calculating the the standard enthalpy of formation of HI.
by Amir Patel 1G
Mon Jan 30, 2017 10:01 am
Forum: General Science Questions
Topic: Sig Figs with Logs
Replies: 2
Views: 983

Re: Sig Figs with Logs

The course reader uses "mantissa" when explaining sig figs for logarithm problems. This term refers to the digits after the decimal point, so since 10^2.18 has 2 sig figs after the decimal point, there will be 2 sig figs in the final decimal answer written in scientific notation, 1.5x10^2.
by Amir Patel 1G
Thu Jan 26, 2017 11:42 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz1 Prep
Replies: 1
Views: 273

Re: Quiz1 Prep

I believe Chemistry Moderator posted in previous threads indicating that answers would not be posted in order to encourage students to work together and determine the correct answers.
by Amir Patel 1G
Sat Jan 21, 2017 12:22 pm
Forum: Significant Figures
Topic: Sig Figs
Replies: 8
Views: 799

Re: Sig Figs

There are additional significant figure examples about addition, subtraction, multiplication, and division, as well as rounding and logarithms on pages 122-123 in the Course Reader.
by Amir Patel 1G
Fri Jan 13, 2017 10:10 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Enthalpy Question
Replies: 4
Views: 340

Re: Standard Enthalpy Question

Hello, I believe they used those reactions (O2 --> O2, Br2 --> Br2) since they demonstrate that the standard enthalpy of formation is 0. Since the reactants and products are identical, as you mentioned, no additional energy is needed to break or form bonds, and therefore no heat is being absorbed or...
by Amir Patel 1G
Sun Nov 27, 2016 7:50 pm
Forum: Bronsted Acids & Bases
Topic: Distinction between Bronsted and Lewis
Replies: 2
Views: 330

Re: Distinction between Bronsted and Lewis

I believe Bronsted acids and bases concern protons, while Lewis acids and bases concern electrons. A Bronsted base will accept a proton while a Lewis acid will accept an electron pair.
by Amir Patel 1G
Fri Nov 25, 2016 3:10 pm
Forum: Bronsted Acids & Bases
Topic: Weak Acid
Replies: 4
Views: 581

Re: Weak Acid

Since HF has a smaller atomic bond, wouldn't that mean it has a shorter bond length, which is why it is a weaker acid and harder to break the bond?
by Amir Patel 1G
Fri Nov 25, 2016 3:05 pm
Forum: Student Social/Study Group
Topic: RE: Final Study Group
Replies: 1
Views: 486

Re: RE: Final Study Group

Hello! I'm up for studying this week! My lounge probably isn't the most ideal as it's usually filled with people studying.
by Amir Patel 1G
Fri Nov 25, 2016 3:03 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1015192

Re: Post All Chemistry Jokes Here

Good luck with finals, everyone!
by Amir Patel 1G
Thu Nov 10, 2016 9:30 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1015192

Re: Post All Chemistry Jokes Here

I asked the guy sitting next to me in lecture yesterday if he had any Sodium Hypobromite…
He said NaBrO. :(
by Amir Patel 1G
Wed Oct 26, 2016 4:50 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz Grades
Replies: 3
Views: 534

Re: Quiz Grades

I just checked my grades on UCLA and it has my Quiz 1 score posted. MyUCLA > Classes > Exam and Homework Grades
by Amir Patel 1G
Tue Oct 18, 2016 4:58 pm
Forum: Trends in The Periodic Table
Topic: Grouping of Valence Electrons [ENDORSED]
Replies: 3
Views: 635

Re: Grouping of Valence Electrons [ENDORSED]

Hello Parsia,

Pb has 4 valence electrons since its valence shell (n=6) has 4 electrons. The 6s and 6p sub-shells are both holding 2 electrons, which means the 6s orbital is full, but the 6p orbitals still have room for 4 additional electrons.
by Amir Patel 1G
Mon Oct 17, 2016 10:02 pm
Forum: Hybridization
Topic: Memorization Tricks
Replies: 9
Views: 1546

Re: Memorization Tricks

My high school chemistry teacher taught us "King Henry died by drinking chocolate milk", so pretty similar to what everyone else has been suggesting.
by Amir Patel 1G
Fri Oct 07, 2016 10:10 am
Forum: Administrative Questions and Class Announcements
Topic: Scantrons?
Replies: 2
Views: 285

Re: Scantrons?

During my discussion session yesterday, my TA didn't mention anything about scantrons and said we could complete our quiz in pen so I am assuming we don't need to purchase Scantrons. Do you know where to purchase Scrantons if we end up needing them for a future exam?
by Amir Patel 1G
Fri Oct 07, 2016 10:06 am
Forum: Student Social/Study Group
Topic: Rieber Hall 14A Study Group (Fall 2016)
Replies: 49
Views: 4405

Re: Rieber Hall 14A Study Group (Fall 2016)

Hello everyone!

I'm from Rieber Terrace, but it appears we don't have a study group at this time. I'm interested joining you all and wanted to know the next time you were planning to get together. Thanks!

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