Search found 14 matches
- Sun Mar 19, 2017 6:04 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 513419
Re: Saying Thank You to Dr. Lavelle
Thank You so much Dr. Lavelle for making Chemistry a subject that I've come to enjoy whereas in the past I didn't like so much. I loved your teaching style and all the opportunities you gave us to get help on things that we didn't understand. You are a great professor. Thank You again.
1.25
For the name of the alkene I got 1,4 Dimethyl 2 butene but the answer is 3,4 dimethyl 3 heptene. Why is that? I thought that for the double bond it gets priority so it is 2 and the two methyl groups are on the 1st and 4th carbon. Also I drew out the structure and got 4 carbons on the longest chain w...
- Thu Mar 02, 2017 4:33 pm
- Forum: *Organic Reaction Mechanisms in General
- Topic: Section 4.3 problem 4.28
- Replies: 1
- Views: 414
Section 4.3 problem 4.28
For the quiz coming up would we need to write out the full reaction like we need to for the homework or will the reaction be given to us?
- Sun Feb 26, 2017 11:34 pm
- Forum: *Electrophiles
- Topic: Electrophile Vs. Nucleophile
- Replies: 3
- Views: 893
Electrophile Vs. Nucleophile
How can I determine if an atom is an electrophile or nucleophile if it is not obvious?
- Sun Feb 19, 2017 11:36 pm
- Forum: First Order Reactions
- Topic: Homework 15.11
- Replies: 1
- Views: 439
Homework 15.11
I am confused as to how I should use the 65 degrees C to find the initial rate of decomposition. Is the temperature important in this case?
- Mon Feb 06, 2017 6:37 pm
- Forum: Balancing Redox Reactions
- Topic: Chapter 14 Question 1
- Replies: 2
- Views: 721
Chapter 14 Question 1
The question is to identify the elements undergoing changes in the oxidation state and indicate the initial and final oxidation state. The equation is H+(aq) + Cr2O7^2-(aq) + C2H5OH(aq) ----> Cr^3+(aq) + C2H4O(aq) + H20(l) The answer is that Cr is reduced from 6+ to 3+ and C is oxidized from 2- to 1...
- Wed Feb 01, 2017 2:16 am
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 1 Preparation Answers
- Replies: 130
- Views: 25181
Re: Quiz 1 Preparation Answers
Could someone explain to me how to get #10 please? I am confused because we do not know the final temperature. I do believe we use the equation deltaS=qrev/T,by plugging in 200J/(273+20) you will get the answer. Where did you get the 273 from? I know q=200J and the temp. is 20 degrees C but where d...
- Sun Jan 29, 2017 11:49 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Entropy
- Replies: 1
- Views: 446
Entropy
For a better understanding of entropy, I just wanted to know can I think of entropy as a random kind of system? Is what results from entropy random or systematic?
- Sun Jan 22, 2017 11:55 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Bond Enthalpy and Energy of Formation
- Replies: 1
- Views: 409
Bond Enthalpy and Energy of Formation
When is it best to use the bond enthalpy method over the enthalpy of formation method and could I use Hess's Method, Bond Enthalpy Method, and Enthalpy of Formation for every problem the asks for the reaction enthaply or do some have restrictions?
- Sat Dec 03, 2016 11:29 pm
- Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
- Topic: homework question 13.5
- Replies: 1
- Views: 877
homework question 13.5
Why does NaCN (aq) effect the reaction with HCN (aq) for part A but for part B the NaCl (aq) have no effect on the NH2NH2 (aq)? And why is it 0.060+x on the ice table under CN- which tells me the initial of CN- is ).060 M when the 0.060M belongs to the NaCN not CN-?
- Wed Nov 23, 2016 11:19 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: When Should I use the ICE table?
- Replies: 5
- Views: 26691
When Should I use the ICE table?
I was having trouble identifying when I should use the ICE table. What is the exact purpose of it and how do I know when to use it?
- Wed Nov 02, 2016 1:55 pm
- Forum: Lewis Structures
- Topic: Does it matter where the atoms are placed in a Lewis diagram?
- Replies: 1
- Views: 1082
Does it matter where the atoms are placed in a Lewis diagram?
For example, for CH2F2 is it okay if I draw the diagram with C in the middle and F with three lone pairs on the top and bottom of C with H on the left and right of C? The answer in the solutions for the text book is C in the middle with F with 3 lone pairs on the top and to the left of F with H to t...
- Fri Oct 07, 2016 11:21 pm
- Forum: Phase Changes & Related Calculations
- Topic: Chemistry Humor
- Replies: 26
- Views: 5429
Re: Chemistry Humor
If a king farts is it a noble gas?
- Fri Sep 30, 2016 11:34 pm
- Forum: Student Social/Study Group
- Topic: CHEM JOKES
- Replies: 29
- Views: 6855
Re: CHEM JOKES
Don't trust atoms because they make up everything.