Search found 25 matches
- Sun Mar 19, 2017 1:47 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 571902
Re: Saying Thank You to Dr. Lavelle
thank you for the time you've invested in ensuring we have access to countless resources that have helped us prepare for this class!
- Sun Mar 05, 2017 8:40 pm
- Forum: Student Social/Study Group
- Topic: Book
- Replies: 2
- Views: 799
Re: Book
nope, i don't think so
- Sun Mar 05, 2017 4:04 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3654155
Re: Post All Chemistry Jokes Here
i know we haven't covered hydrogenation yet but
- Sun Mar 05, 2017 4:02 pm
- Forum: General Science Questions
- Topic: Lewis structure
- Replies: 2
- Views: 872
Re: Lewis structure
sulphur is the least electronegative
- Tue Feb 28, 2017 2:40 pm
- Forum: *Alkanes
- Topic: Naming [ENDORSED]
- Replies: 93
- Views: 16764
Re: Naming [ENDORSED]
I believe you use dashes not just to separate numbers but also prefixes/suffixes. e.g. 3-ethyl-5-methyl-octane
- Wed Feb 22, 2017 10:48 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 2 Winter 2017
- Replies: 160
- Views: 24951
Re: Quiz 2 Winter 2017
I was wondering the same thing ^ (sig figs in #6)
- Sat Feb 11, 2017 10:27 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Units of Temperature in Entropy Change Expression [ENDORSED]
- Replies: 1
- Views: 536
Units of Temperature in Entropy Change Expression [ENDORSED]
When using the expression delta S = Cp ln (T2/T1), does it matter if we use Kelvin or Celsius for the values of T2 and T1?
- Sat Feb 11, 2017 3:59 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm Winter 2017
- Replies: 87
- Views: 21143
Re: Midterm Winter 2017
It said the same thing for me (plugin not working). Try downloading it by clicking on the "Part 1.mp4" file - do the same for all 3 files. I downloaded it and can watch it now
- Sun Feb 05, 2017 10:31 pm
- Forum: Phase Changes & Related Calculations
- Topic: Random question
- Replies: 3
- Views: 919
Re: Random question
i think it depends on the specific phase changes/chemical changes you're comparing..
- Sun Feb 05, 2017 10:30 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Quiz 1
- Replies: 4
- Views: 1193
Re: Quiz 1
quizzes aren't curved but final grades are
- Sun Feb 05, 2017 10:30 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3654155
Re: Post All Chemistry Jokes Here
What do you do with a sick chemist?
First you try and helium, then try and curium, but it that doesn’t work, you barium
First you try and helium, then try and curium, but it that doesn’t work, you barium
- Sat Jan 28, 2017 2:16 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Practice Quiz Answers
- Replies: 8
- Views: 1551
Re: Practice Quiz Answers
Would anyone be interested in cross-checking answers in that case?
- Sat Jan 28, 2017 2:15 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Molar Heat Capacity for Ideal Gas
- Replies: 1
- Views: 511
Molar Heat Capacity for Ideal Gas
I wasn't sure about how to solve #31 from chapter 8 so I checked out the solutions manual and realized we needed the molar heat capacity for the gas. Are we expected to know the molar heat capacity values for atoms/linear/non-linear molecules? Also, how does molar heat capacity at constant pressure ...
- Wed Jan 18, 2017 12:14 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3654155
Re: Post All Chemistry Jokes Here
Did you hear about the man who got cooled to absolute zero?
He's 0K now.
He's 0K now.
- Sat Nov 26, 2016 11:16 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Ch 11 #7c
- Replies: 2
- Views: 654
Re: Ch 11 #7c
I didn't understand how to answer this part of the question either. "11.7: The following flasks show the dissociation of a diatomic molecule, X2, over time. (a) Which flask represents the point in time at which the reaction has reached equilibrium? (b) What percentage of the X2 molecules have d...
- Tue Nov 22, 2016 8:06 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Treating Systems that have Small Equilibrium Constants
- Replies: 4
- Views: 1318
Re: Treating Systems that have Small Equilibrium Constants
hi! this helped me sort of gauge when we can/can't approximate and why:
https://www.khanacademy.org/science/che ... r-small-kc
https://www.khanacademy.org/science/che ... r-small-kc
- Tue Nov 15, 2016 9:31 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 3 Prep vs Actual Quiz 3
- Replies: 1
- Views: 763
Re: Quiz 3 Prep vs Actual Quiz 3
he said we don't need to know how to draw the structure in class
- Tue Nov 15, 2016 9:26 pm
- Forum: Naming
- Topic: Long ligand names in formulas
- Replies: 1
- Views: 524
Re: Long ligand names in formulas
i think we just write (en). I believe it was written like that somewhere in the textbook
- Tue Nov 15, 2016 9:24 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: What is the structure of dien?
- Replies: 2
- Views: 905
Re: What is the structure of dien?
the metal atom bonds to the three nitrogens in dien as they have lone pairs
it would probably be octahedral
it would probably be octahedral
- Mon Nov 14, 2016 6:06 pm
- Forum: Naming
- Topic: Writing the formula of a coordination compound
- Replies: 2
- Views: 895
Re: Writing the formula of a coordination compound
Also, for alphabetical order - do we consider the chemical symbols or the actual/written names of the ligands?
- Mon Nov 14, 2016 6:02 pm
- Forum: Naming
- Topic: Writing the formula of a coordination compound
- Replies: 2
- Views: 895
Writing the formula of a coordination compound
When writing down the formula of a coordination compound, do we consider whether a ligand is neutral/anionic as well as the alphabetical order or is only the alphabetical order taken into consideration? I read somewhere that you write neutral ligands first, followed by anionic ones.
- Mon Nov 14, 2016 5:54 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Equilibrium direction??
- Replies: 1
- Views: 561
Re: Equilibrium direction??
a general reaction is written in the form R --> P where R is the reactant and P is the product formed. When we say a reaction tends to the left, we mean it favors the formation of reactants (since reactants are on the left side of the equation). Similarly when we say a reaction tends to the right, w...
- Wed Nov 09, 2016 2:27 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3654155
Re: Post All Chemistry Jokes Here
Did you hear about the man who got cooled to absolute zero? He's 0K now.
- Mon Oct 31, 2016 9:41 pm
- Forum: Lewis Structures
- Topic: Fall 2012 Midterm Question 7b
- Replies: 2
- Views: 667
Re: Fall 2012 Midterm Question 7b
The structure with the three double bonded Os has a FC of 0 on each of the three oxygens and a formal charge of -1 on the fourth oxygen. This is where the molecule gets its overall charge from. In the structure you're suggesting, however, chlorine carries the -1 charge, which is less favorable/desir...
- Thu Oct 27, 2016 1:25 am
- Forum: Lewis Structures
- Topic: Quiz 2 Prep Question #7
- Replies: 2
- Views: 790
Re: Quiz 2 Prep Question #7
It basically wants you to identify/recognize that the structure of XeO2F2 is an exception to the octet rule because Xe expands its octet/has more than eight electrons in it's valence shell in this structure. Neon, on the other hand, is a member of period 2, so even if it were to be a central atom, i...