Search found 20 matches
- Fri Mar 11, 2016 10:08 am
- Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
- Topic: Torsional strain
- Replies: 4
- Views: 749
Re: Torsional strain
I'm pretty sure that torsional strain can never be negative and can only be as low as 0 (when there is no strain).
- Mon Mar 07, 2016 6:40 pm
- Forum: *Amines
- Topic: Double/Triple Bonds vs. Functional Groups
- Replies: 1
- Views: 1554
Re: Double/Triple Bonds vs. Functional Groups
Here is an important list of rules to remember when naming organic compounds with double and triple bonds (you might also want to go on this site to see other rules and examples): http://www.chem.uiuc.edu/GenChemReferences/nomenclature_rules.html"onclick="window.open(this.href);return false; 1. The ...
- Sun Feb 28, 2016 3:38 pm
- Forum: *Alkanes
- Topic: Iso vs. Neo
- Replies: 2
- Views: 451
Re: Iso vs. Neo
Also remember that other prefixes such as sec and tert can be used... Iso and neo are basically used for alkyl groups and sec and tert are used for carbon atoms which have functional groups, charge or are radicals. Prefix sec- is used for those carbon atoms which are joined to two other carbon atoms...
- Mon Feb 22, 2016 9:33 pm
- Forum: *Nucleophiles
- Topic: Nucleophiles vs. Ligand
- Replies: 3
- Views: 1677
Re: Nucleophiles vs. Ligand
It is all about the specifics of the molecule that makes them different. Ligands are molecules and atomic groups bonded for central atom of complex molecule. Nucleophiles are molecules or atomic groups with affinity towards positively charged groups. They are negatively charged. So the main differen...
- Tue Feb 16, 2016 11:25 am
- Forum: General Rate Laws
- Topic: Including k in rate laws
- Replies: 4
- Views: 648
Re: Including k in rate laws
Yeah for the vast majority of problems involving the rate law, the k value is essential in understanding the reaction and will typically be required on a quiz question.
- Mon Feb 08, 2016 8:03 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Multiple Oxidation Half-Reactions?
- Replies: 1
- Views: 410
Re: Multiple Oxidation Half-Reactions?
I would use whichever half-reaction that best matches the given reaction as this should reduce any possibility of your voltage being different from the answer. Also I think with the information given that the book answer made the most sense.
- Fri Jan 29, 2016 5:07 pm
- Forum: Balancing Redox Reactions
- Topic: Determining the Oxidation Number
- Replies: 1
- Views: 337
Re: Determining the Oxidation Number
Each atom of Cr is 2+, however, in the reaction if there are 2Cr2+, then the total for that part of the redox reaction would be 4+.
- Sat Jan 23, 2016 7:43 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Closed Systems Question
- Replies: 2
- Views: 547
Re: Closed Systems Question
Although a closed system can exchanged heat or work with its surroundings, it cannot exchange matter. This means that although there is a transfer of energy there is a conservation of the matter in a system.
- Wed Jan 20, 2016 2:06 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: What influence the degeneracy?
- Replies: 1
- Views: 444
Re: What influence the degeneracy?
Systems are said to be degenerate if they give the same value of energy upon measurement. In addition to volume, I believe that pressure and temperature can also influence degeneracy.
- Mon Jan 11, 2016 11:48 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Problem 8.7
- Replies: 2
- Views: 480
Re: Problem 8.7
Are you sure that was the final equation for problem 8.7, I thought it was a work and internal energy question and thus the equation to use would be w=deltaU-q with a final answer of +4.90x10^2J
- Thu Dec 03, 2015 1:20 pm
- Forum: *Indicators
- Topic: Stoich and End Points
- Replies: 3
- Views: 1006
Re: Stoich and End Points
The key is to find the point at which the acid or base of the sample and the respective acid or base of the titration reach a balance (stoichiometric point), thus it would be important that the end point be close to the stoichiometric point in an accurate reaction.
- Sun Nov 29, 2015 10:18 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Acids with Carbon
- Replies: 2
- Views: 501
Re: Acids with Carbon
Due to the delocalization of the negative charge and the resulting instability of these types of acids, their ions will reform more quickly and thus be less acidic, causing acids with carbon to be weak acids.
- Thu Nov 19, 2015 2:28 pm
- Forum: Naming
- Topic: Cobalt and Cobaltate?
- Replies: 2
- Views: 720
Re: Cobalt and Cobaltate?
Yes, you would use the "ate" suffix version if the compound is an anion, or has a negative charge, while the regular version would be used for positive or if the net charge is 0. Also I believe that [Co(NH3)6]^(3+) is Hexaamminecobalt(III) and [Co(CN)5(H20)]^(2-) is Aquopentacyanocobaltate...
Re: Naming
I do not think that it would be a bad thing to know all of them, however, the quiz and subsequently the final as well will probably use only ones that Professor Lavelle or the textbook uses.
- Mon Nov 09, 2015 10:36 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Gibbs Free Energy Equation (11.29 HW)
- Replies: 1
- Views: 374
Re: Gibbs Free Energy Equation (11.29 HW)
If it is not in the course reader, I would not expect it to be on a test, however, it could not hurt to learn it to at least some degree...
- Sun Nov 01, 2015 4:51 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Ionization energy and bond order
- Replies: 1
- Views: 560
Re: Ionization energy and bond order
No, I believe that there is no relationship between the two. For example, in the diatomic molecules N2 (bond order=3), O2 (bond order=2), and F2 (bond order=1), oxygen has the lowest ionization energy, but a higher bond order than fluorine.
- Sun Oct 25, 2015 9:31 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Homework question 4.13d
- Replies: 2
- Views: 451
Re: Homework question 4.13d
The central atom is the atom that is the least electronegative. For that reason, N will be the central atom.
- Sun Oct 18, 2015 6:04 pm
- Forum: Octet Exceptions
- Topic: Radical Lewis Diagram 3.59a
- Replies: 2
- Views: 524
Re: Radical Lewis Diagram 3.59a
For most molecules, although formal charges of 0 mean that it is in its most stable state, it is more important that the atoms follow the octet rule. Since Cl and O do not have a d orbital, it would be difficult for them to form an expanded octet, yielding the answer provided in the answer book.
- Sat Oct 10, 2015 9:36 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Shielding Effect
- Replies: 5
- Views: 957
Re: Shielding Effect
Also, although the electrons are never positive, they do increase in energy as they move away from the center i.e. as n goes to infinity, E gets closer and closer to 0.
- Fri Oct 02, 2015 2:07 pm
- Forum: SI Units, Unit Conversions
- Topic: How do you go from meter to nanometer? [ENDORSED]
- Replies: 7
- Views: 1992
Re: How do you go from meter to nanometer? [ENDORSED]
Because a nanometer is 1.0 x 10^-9 of a meter, 340 nm is equivalent to 3.4 x 10^-7 m. Essentially, it is only a different way to write the same amount.