Search found 25 matches
- Sat Mar 18, 2017 11:26 pm
- Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
- Topic: Chapter 3 Question 7
- Replies: 1
- Views: 1320
Chapter 3 Question 7
How do you know if the drawing is supposed to be eclipsed or staggered? Is it based on the dihedral angle? If so, how does that work?
- Sat Mar 18, 2017 9:27 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3927111
Re: Post All Chemistry Jokes Here
Gold strolls into a chemical bar. The bartender yells "Ay you! Get outta here!" (Get it, AU?)
- Sat Mar 18, 2017 9:25 pm
- Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
- Topic: When to use Isomers
- Replies: 1
- Views: 1287
When to use Isomers
When do you need to use cis and trans naming?
- Tue Mar 07, 2017 6:55 pm
- Forum: *Nucleophiles
- Topic: Lone Pairs
- Replies: 4
- Views: 1457
Lone Pairs
Any time there are lone pairs, does that make the compound a nucleophile?
- Tue Mar 07, 2017 6:26 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 3 Winter 2017
- Replies: 183
- Views: 30125
Re: Quiz 3 Winter 2017
For number 5, how are there 2 intermediates?
- Tue Mar 07, 2017 6:00 pm
- Forum: *Cycloalkanes
- Topic: Multiple possible names
- Replies: 2
- Views: 606
Multiple possible names
When you are naming a cycloalkane, and you find multiple names possible, how do you determine which is best? Do you pick the name with overall lower numbers? Do you compare each number consecutively? Do you pick the name with the lowest first number (because it is based alphabetically)? Why does the...
- Tue Mar 07, 2017 5:56 pm
- Forum: *Alkanes
- Topic: Different Substituent Numbers
- Replies: 1
- Views: 560
Different Substituent Numbers
I am still confused when there are multiple possible names, which to select.
For example: 4-Ethyl-2,2-Dimethyl-hexane vs. 3-Ethyl-5,5-Dimethyl-Hexane. I know that the first name is correct, however how would you determine that? If it isn't by adding the total number, then what is it?
For example: 4-Ethyl-2,2-Dimethyl-hexane vs. 3-Ethyl-5,5-Dimethyl-Hexane. I know that the first name is correct, however how would you determine that? If it isn't by adding the total number, then what is it?
- Sun Mar 05, 2017 3:14 pm
- Forum: *Nucleophilic Substitution
- Topic: Bimolecular Nucleophilic Substitution Reaction
- Replies: 3
- Views: 1524
Bimolecular Nucleophilic Substitution Reaction
How do you tell if the rate limiting step is a second order reaction, thus a bimolecular nucleophilic substitution reaction?
- Sun Feb 19, 2017 8:59 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3927111
Re: Post All Chemistry Jokes Here
Why do chemists like nitrates so much?
They are cost less than day rates!!!!
They are cost less than day rates!!!!
- Thu Feb 09, 2017 8:12 pm
- Forum: Balancing Redox Reactions
- Topic: Acidic and Basic Solutions
- Replies: 2
- Views: 515
Acidic and Basic Solutions
Why is it that when you add hydroxide to the reactant side of the half reaction, it is considered basic? Don't bases produce hydronium ions in solution?
- Fri Jan 27, 2017 11:19 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Chapter 9 Q43
- Replies: 1
- Views: 462
Chapter 9 Q43
The Answer in the solution manual states: "Assume no change in volume. To calculate the change in entropy for the hot and cold water, the amount of energy which flows from one to the other must first be calculated: q(c) = -q(h)." Why is that when there is no change in volume the heat of th...
- Thu Jan 19, 2017 10:15 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Problem Three Part A
- Replies: 1
- Views: 512
Problem Three Part A
8.3: Air in a bicycle pump is compressed by pushing in th ehandle. if the inner diameter of the pump is 3 cm and the pump is depressed 20 cm with a pressure of 2atm, (a) how much work is done in the compression? Why when finding the amount of work, Area times Distance is equal to the change of volum...
- Fri Jan 13, 2017 9:34 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Standard Enthalpies of Formation Basics
- Replies: 2
- Views: 567
Standard Enthalpies of Formation Basics
I am confused about how to find the standard states of compounds and elements for standard Enthalpies of formation. How do you know what state to use for each element and compound?
- Fri Dec 02, 2016 10:49 pm
- Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
- Topic: Chapter 13 #5
- Replies: 1
- Views: 1182
Chapter 13 #5
For a. What is the concentration of hydronium ions in a solution that is 0.075 M HCN (aq) and 0.060 M NaCN(aq)?
Why can you not use the Henderson-Hasselbalch equation to solve this? As opposed to 13.7?
Why can you not use the Henderson-Hasselbalch equation to solve this? As opposed to 13.7?
- Fri Dec 02, 2016 9:10 pm
- Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
- Topic: Chapter 13 #7a
- Replies: 2
- Views: 1662
Chapter 13 #7a
The question asks to determine the pH and pOH of a solution that is 0.50 M NaHSO4 and .25 Na2SO4. What is the chemical equation for this reaction? If there are two steps, what are the two steps?
- Sun Nov 27, 2016 2:13 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: The effect of Cl- [ENDORSED]
- Replies: 1
- Views: 492
The effect of Cl- [ENDORSED]
When ammonium chloride mixes with water, why does the Cl- not affect the overall pH. Couldn't Cl- accept a proton and form HCl, therefore increasing the pH?
- Sun Nov 27, 2016 11:44 am
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Purpose of Acidity and Basicity Constants
- Replies: 1
- Views: 548
Purpose of Acidity and Basicity Constants
Besides being a mere convenience, what are the purposes of pKa and pKb. What do they show or mean?
- Thu Nov 17, 2016 10:03 am
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Stability [ENDORSED]
- Replies: 1
- Views: 881
Stability [ENDORSED]
Is a diamagnetic compound more stable than a paramagnetic compound? Does the charge affect the stability as well?
- Mon Nov 07, 2016 2:39 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: MO Setup
- Replies: 1
- Views: 373
MO Setup
To make a MO Diagram fro Li2 +, does it matter from which side/Li atom we take an electron from? Or can we take from either atom?
- Mon Nov 07, 2016 2:37 pm
- Forum: Hybridization
- Topic: Hybridization
- Replies: 2
- Views: 672
Hybridization
What is the Difference between Hybridized and unhybridized orbitals?
- Tue Oct 25, 2016 11:37 am
- Forum: Octet Exceptions
- Topic: Carbon as a radical
- Replies: 1
- Views: 616
Carbon as a radical
Does carbon exist more commonly as a radical rather than accepting a negative formal charge?
- Sun Oct 23, 2016 10:40 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3927111
Re: Post All Chemistry Jokes Here
Joke 1: Is silicon the same in Spanish?
Answer: Si
Joke 2: I blew up my chemistry experiment...
OXIDANTS HAPPEN
Joke 3: I think I've Lost an Electron... In fact I'm Positive
Answer: Si
Joke 2: I blew up my chemistry experiment...
OXIDANTS HAPPEN
Joke 3: I think I've Lost an Electron... In fact I'm Positive
- Fri Oct 14, 2016 5:55 pm
- Forum: Photoelectric Effect
- Topic: Threshold Energy
- Replies: 1
- Views: 639
Threshold Energy
Hello !
Is it possible to have a negative threshold energy value?
Is it possible to have a negative threshold energy value?
- Tue Oct 04, 2016 1:09 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Chapter 1 Question #15 [ENDORSED]
- Replies: 1
- Views: 816
Chapter 1 Question #15 [ENDORSED]
1.15: In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral line. So I know the wavelength of the light is 102.6nm. I began solving thi...
- Wed Sep 28, 2016 6:20 pm
- Forum: Limiting Reactant Calculations
- Topic: Reaction Stoichiometry L 39 [ENDORSED]
- Replies: 1
- Views: 1106
Reaction Stoichiometry L 39 [ENDORSED]
Hi! The following question is not under the limiting reactant section, but is rather under "L- Reaction Stoichiometry". L.39: A 1.50-g sample of metallic tin was placed in a 26.45-g crucible and heated until all the tin had reacted with the oxygen in air to form an oxide. The crucible and ...