Search found 10 matches

by ChristineCastanon_1B
Mon Mar 13, 2017 1:14 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7337
Views: 788894

Re: Post All Chemistry Jokes Here

Photons have mass? I didn't know they were catholic!
by ChristineCastanon_1B
Sun Mar 05, 2017 9:53 pm
Forum: *Alkanes
Topic: Naming [ENDORSED]
Replies: 92
Views: 7268

Re: Naming [ENDORSED]

nikita bhat 2D wrote:What do the numbers represent?


The numbers represent which carbon the substituents are added to. You number the carbons on the longest chain and it could start on the right or left side, but in the end, you number it so that the substituent is bonded to the lowest number carbon.
by ChristineCastanon_1B
Mon Feb 20, 2017 4:51 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 Winter 2017
Replies: 160
Views: 14099

Re: Quiz 2 Winter 2017

Could anybody briefly explain how you did number 11?
by ChristineCastanon_1B
Mon Feb 20, 2017 2:58 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 Winter 2017
Replies: 160
Views: 14099

Re: Quiz 2 Winter 2017

Can someone please help me with #3? I used the integrated rate law for first order and I got t=205 seconds For #3, it is a first order reaction, so you use the corresponding equation ln[A] = -kt + ln[A0] so, ln(.33) = -(.0068)t + ln(.75) ln(.33/.75) = -.0068t t = ln(.33/.75)/-.0068 t = 120 sec Than...
by ChristineCastanon_1B
Sat Feb 11, 2017 10:05 pm
Forum: Balancing Redox Reactions
Topic: Midterm 2013, Q7
Replies: 5
Views: 354

Re: Midterm 2013, Q7

MnO4 is flipped because it is the half-reduction that is being oxidized. MnO4 is loosing electrons during the reaction, making it the anode and the anode is always negative.
by ChristineCastanon_1B
Sun Feb 05, 2017 10:28 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Anode and Cathode placement in Galvanic/Voltaic Cells
Replies: 2
Views: 216

Re: Anode and Cathode placement in Galvanic/Voltaic Cells

The cell potential describes how much work can be produced from the energy converted from the system. It is compared to the standard hydrogen electrode because this electrode serves as a reference point when calculating/comparing data.
by ChristineCastanon_1B
Sun Jan 29, 2017 11:48 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Quiz 1 Question 7 (increase in entropy)
Replies: 1
Views: 183

Re: Quiz 1 Question 7 (increase in entropy)

Because the glass of water is loosing 100J of energy and the change in S = Qrev/T, if Q decreases, then so does S because they're proportional.
by ChristineCastanon_1B
Sat Jan 21, 2017 9:07 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Question about Heat Capacities at Constant Volume and Constant Pressure [ENDORSED]
Replies: 2
Views: 275

Re: Question about Heat Capacities at Constant Volume and Constant Pressure [ENDORSED]

The heat capacity at constant pressure is greater than the heat capacity at constant volume because when heat is added at constant pressure, the substance expands and work. Because some of this energy is lost due to expansion work done by the system, more energy then has to be supplied to increase t...
by ChristineCastanon_1B
Mon Jan 16, 2017 11:07 pm
Forum: Administrative Questions and Class Announcements
Topic: Bruincast
Replies: 26
Views: 7821

Re: Bruincast

Josephine_Tang_1N wrote:Will any of the 14B lectures be Webcasted?

I heard that they will be and that it will be lecture 3.

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