Search found 14 matches

by Angelica Nava-1E
Sun Mar 19, 2017 6:04 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 200
Views: 44547

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.
by Angelica Nava-1E
Tue Mar 07, 2017 1:25 pm
Forum: *Alkenes
Topic: 1.25
Replies: 1
Views: 304

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...
by Angelica Nava-1E
Thu Mar 02, 2017 4:33 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Section 4.3 problem 4.28
Replies: 1
Views: 211

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?
by Angelica Nava-1E
Sun Feb 26, 2017 11:34 pm
Forum: *Electrophiles
Topic: Electrophile Vs. Nucleophile
Replies: 3
Views: 355

Electrophile Vs. Nucleophile

How can I determine if an atom is an electrophile or nucleophile if it is not obvious?
by Angelica Nava-1E
Sun Feb 19, 2017 11:36 pm
Forum: First Order Reactions
Topic: Homework 15.11
Replies: 1
Views: 268

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?
by Angelica Nava-1E
Mon Feb 06, 2017 6:37 pm
Forum: Balancing Redox Reactions
Topic: Chapter 14 Question 1
Replies: 2
Views: 404

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...
by Angelica Nava-1E
Wed Feb 01, 2017 2:16 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 1 Preparation Answers
Replies: 130
Views: 12846

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...
by Angelica Nava-1E
Sun Jan 29, 2017 11:49 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Entropy
Replies: 1
Views: 203

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?
by Angelica Nava-1E
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: 199

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?
by Angelica Nava-1E
Sat Dec 03, 2016 11:29 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: homework question 13.5
Replies: 1
Views: 342

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-?
by Angelica Nava-1E
Wed Nov 23, 2016 11:19 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: When Should I use the ICE table?
Replies: 6
Views: 11705

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?
by Angelica Nava-1E
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: 266

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...
by Angelica Nava-1E
Fri Oct 07, 2016 11:21 pm
Forum: Phase Changes & Related Calculations
Topic: Chemistry Humor
Replies: 26
Views: 2341

Re: Chemistry Humor

If a king farts is it a noble gas?
by Angelica Nava-1E
Fri Sep 30, 2016 11:34 pm
Forum: Student Social/Study Group
Topic: CHEM JOKES
Replies: 29
Views: 3052

Re: CHEM JOKES

Don't trust atoms because they make up everything.

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