Search found 38 matches
- Sun Mar 13, 2016 1:26 pm
- Forum: *Alcohols
- Topic: Numbering Final 9B
- Replies: 1
- Views: 444
Numbering Final 9B
In the second molecule of the 2015 Final 9B, they numbered the molecule starting with the cyclo-substituents and said propan-2-ol. Shouldn't the numbering start with the alcohol since it is the functional group and therefore has higher priority so that it should be ...propan-1-ol?
- Sat Mar 12, 2016 9:48 pm
- Forum: *Cycloalkenes
- Topic: Z/E for cycloalkenes
- Replies: 1
- Views: 498
Z/E for cycloalkenes
For 7A on the 2011 final, it names the structure as E? How do you determine priority for deciding Z/E for cycloalkenes?
- Sat Mar 12, 2016 6:47 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Winter 2016 Final Exam Review and Information
- Replies: 25
- Views: 18471
Re: Winter 2016 Final Exam Review and Information
Are we expected to memorize the energy differences or the bond angles for the different conformations?
Priority
I read online that according to IUPAC double bonds have higher priority than triple bonds for numbering the longest carbon chain, but most TAs and UAs I have talked to have said that they have equal priority and to pick the numbering scheme that'll give you the lowest numbers so the triple bond can ...
- Sat Mar 05, 2016 8:36 pm
- Forum: *Cycloalkenes
- Topic: Benzyl vs Phenyl
- Replies: 1
- Views: 833
Benzyl vs Phenyl
What is the difference between benzyl and phenyl?
- Sat Mar 05, 2016 6:18 pm
- Forum: *Haloalkenes
- Topic: Numbering Priority
- Replies: 1
- Views: 1110
Numbering Priority
In an example in the textbook, the alkyl substituent was given the lower number than the halide. Why does iodo not get the lower number if halides have higher priority over alkyl substituents?
- Mon Feb 29, 2016 12:45 pm
- Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
- Topic: Geometric Isomers with multiple double bonds
- Replies: 1
- Views: 1754
Geometric Isomers with multiple double bonds
In page 17 of the Intro to Organic Chemistry textbook, there are two examples of geometric isomers with multiple double bonds? Which double bond do you consider when deciding if an isomer is cis or trans?
- Mon Feb 29, 2016 10:01 am
- Forum: *Nucleophiles
- Topic: Alkyl and Aryl Carbanions
- Replies: 3
- Views: 868
Alkyl and Aryl Carbanions
What is the difference between alkyl carbanions and aryl carbanions?
- Mon Feb 29, 2016 9:55 am
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 3 Winter 2016
- Replies: 48
- Views: 20672
Re: Quiz 3 Winter 2016
Will we have to know alkyl and aryl carbanions for the quiz?
- Fri Feb 26, 2016 3:17 pm
- Forum: *Cycloalkanes
- Topic: 3-ethyl-1,1-dimethyl-2-propylcyclohexane
- Replies: 1
- Views: 617
3-ethyl-1,1-dimethyl-2-propylcyclohexane
In page 21 of the organic chemistry textbook, it names the structure 3-ethyl-1,1-dimethyl-2-propylcyclohexane and also notes that the common incorrect name is 1-ethyl-3,3-dimethyl-2-propylcyclohexane. In a previous page, it states that if the numbering schemes contain equivalent numbers, you assign ...
- Fri Feb 26, 2016 12:48 pm
- Forum: *Alkanes
- Topic: Structural Formula parentheses
- Replies: 2
- Views: 660
Re: Structural Formula parentheses
Structural formulas do not have a fixed convention, and in the end, nobody uses them for anything more complicated than basic hydrocarbons because they quickly get very confusing. Parentheses can be used to signify repetition of a group, branching off, or just multiple copies of a branch. I would s...
- Fri Feb 26, 2016 12:32 pm
- Forum: *Alkanes
- Topic: polarizability/nucleophiles
- Replies: 2
- Views: 3704
Re: polarizability/nucleophiles
Stronger nucleophiles have higher polarizability. Br has a greater atomic radius compared to F, so the distance between its electrons and nuclear charge is greater. The greater the distance of electrons from nuclear charge, the less control the nuclear charge has on the charge distribution, and thus...
- Thu Feb 25, 2016 9:18 pm
- Forum: *Identifying Primary, Secondary, Tertiary, Quaternary Carbons, Hydrogens, Nitrogens
- Topic: Equivalent H
- Replies: 2
- Views: 769
Equivalent H
What are equivalent hydrogens and what is its significance in organic compounds? What exactly does it mean when "hydrogens are in the same chemical environment"?
- Mon Feb 22, 2016 9:40 pm
- Forum: *Alkanes
- Topic: Common Names for Alkanes
- Replies: 1
- Views: 559
Common Names for Alkanes
Are we expected to know the common names for alkanes in addition to the IUPAC name for this class?
- Mon Feb 15, 2016 8:35 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz 2 Winter 2016
- Replies: 18
- Views: 7961
Re: Quiz 2 Winter 2016
Do we need to know how to do the steady state approach for the quiz?
- Tue Feb 09, 2016 2:59 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Concentration Cell
- Replies: 1
- Views: 580
Concentration Cell
Would a concentration cell be considered a galvanic cell or an electrolytic cell and why?
- Mon Feb 08, 2016 12:36 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Electrolysis
- Replies: 1
- Views: 511
Electrolysis
What types of problems and calculations could we be asked regarding electrolysis for the midterm? Or should we just know the concept behind electrolysis?
- Mon Feb 08, 2016 12:15 pm
- Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
- Topic: Electrolysis
- Replies: 1
- Views: 476
Electrolysis
What types of problems and calculations could we be asked regarding electrolysis for the midterm? Or should we just know the concept behind electrolysis?
- Sat Feb 06, 2016 9:34 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Arrange in order of increasing standard molar entropy
- Replies: 3
- Views: 8003
Re: Arrange in order of increasing standard molar entropy
Just to clarify, so for this question since the molecules are all in a gas phase and tetrahedral, are we supposed to think of entropy in terms of bond vibrations and mass as opposed to number of arrangements/positions of the atoms as you would with residual entropy?
- Mon Feb 01, 2016 10:34 pm
- Forum: Balancing Redox Reactions
- Topic: Identifying Oxidizing Agent and Reducing Agent
- Replies: 3
- Views: 694
Identifying Oxidizing Agent and Reducing Agent
How do you identify the oxidizing agent and the reducing agent in a reaction?
- Fri Jan 29, 2016 2:33 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Electromotive Force
- Replies: 1
- Views: 423
Electromotive Force
What is the electromotive force? Why does it represent the maximum potential difference?
- Fri Jan 22, 2016 8:23 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Ideal Gas in the Context of the Problem
- Replies: 1
- Views: 377
Ideal Gas in the Context of the Problem
When a question states assume "ideal gas behavior," what information/properties does this indicate?
- Wed Jan 20, 2016 8:33 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Microstates, W, for a molecule
- Replies: 1
- Views: 451
Microstates, W, for a molecule
How do you determine W, the number of microstates, for a molecule such as bromobenzene ()?
- Tue Jan 19, 2016 11:00 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Equations used in Homework 8.25
- Replies: 1
- Views: 480
Re: Equations used in Homework 8.25
The equation C=q/ \Delta T comes from the heat capacity equation q=C \Delta T, so they just isolated C by dividing by \Delta T. The given information of liters and molarities is meant to show that the calorimeter is at constant volume which indicates that no work is being done (w=-P \Delta V=0 when ...
- Tue Jan 12, 2016 3:38 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Work in Reversible Process vs Work in Irreversible Process
- Replies: 3
- Views: 1012
Work in Reversible Process vs Work in Irreversible Process
The textbook states that "Provided the initial and final states are the same, a change carried out reversibly always does more work than a change carried out irreversibly"?
Why is the amount of work a system can do greater in reversible processes as opposed to in irreversible processes?
Why is the amount of work a system can do greater in reversible processes as opposed to in irreversible processes?
- Thu Jan 07, 2016 12:07 pm
- Forum: Phase Changes & Related Calculations
- Topic: kJ vs kJ/mol
- Replies: 1
- Views: 6072
kJ vs kJ/mol
When would you use kJ or kJ/mol?
- Sat Dec 05, 2015 11:47 pm
- Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
- Topic: Titration
- Replies: 1
- Views: 421
Titration
Are we expected to know how to solve for the pH after the equivalence point?
- Tue Nov 17, 2015 11:38 pm
- Forum: Naming
- Topic: Polydentate Ligand Naming
- Replies: 1
- Views: 610
Polydentate Ligand Naming
When naming coordination compounds, the course reader says that if a ligand is polydentate, then use the prefix bis-, tris-, etc. However, I came across some examples that included carbonato (which can be mono- or polydentate) and they did not use bis...etc. I'm assuming that it is because it is mon...
- Sun Nov 15, 2015 1:48 pm
- Forum: Naming
- Topic: Naming Complex Anions
- Replies: 1
- Views: 476
Naming Complex Anions
For complexes with an overall negative net charge, are we expected to know the Greek/Latin name of the element when naming the transition metal on the quiz? Ex) [CuCl4]2- Would we have to know it is tetrachlorocuprate(II) ion or is tetrachlorocopper(II) acceptable? Because on one of the practice qui...
- Tue Nov 10, 2015 10:57 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Determining if a Ligand is Polydentate
- Replies: 6
- Views: 2076
Determining if a Ligand is Polydentate
How do you determine if a ligand is polydentate? Also, how do you determine the maximum number of places on the ligand that can bind simultaneously to a single metal center? Can you tell just by looking at the chemical formula by memorizing general trends about the ligands or do you draw out the lew...
- Sun Nov 08, 2015 9:42 pm
- Forum: Naming
- Topic: naming Coordination compounds
- Replies: 3
- Views: 1115
Re: naming Coordination compounds
I made a video on how to find the oxidation state of a metal in a coordination compound
[youtube]https://youtu.be/LaYZUJzbLkE[/youtube]
[youtube]https://youtu.be/LaYZUJzbLkE[/youtube]
- Sat Nov 07, 2015 10:54 pm
- Forum: Naming
- Topic: naming Coordination compounds
- Replies: 3
- Views: 1115
Re: naming Coordination compounds
In order to find the oxidation number of the transition metal, you have to take into account the charge of the ligands and the overall net charge of the entire compound. The oxidation number of the transition metal and the charge of the ligands should add up to the net charge. Ex) Determine the oxid...
- Mon Nov 02, 2015 5:32 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Electromagnetic Radiation
- Replies: 1
- Views: 511
Electromagnetic Radiation
What is the range for the wavelength in nm of electromagnetic radiation for ultraviolet, visible light, and infrared? Do we have to know the range for x Rays, y Rays, microwaves, and radio waves for the midterm?
- Wed Oct 28, 2015 12:44 am
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polar or Nonpolar Molecules [ENDORSED]
- Replies: 2
- Views: 758
Polar or Nonpolar Molecules [ENDORSED]
How do you determine if a molecule is polar or nonpolar?
- Tue Oct 27, 2015 10:57 pm
- Forum: Lewis Acids & Bases
- Topic: Determining Lewis Acid or Base
- Replies: 1
- Views: 548
Determining Lewis Acid or Base
How do you determine if a molecule is a Lewis acid or base in a reaction?
- Fri Oct 23, 2015 9:50 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Sigma bonds and Pi Bonds
- Replies: 8
- Views: 2599
Re: Sigma bonds and Pi Bonds
The textbook discusses how the greater the extent of orbital overlap, the stronger the bond. Can someone explain why?
- Wed Oct 07, 2015 5:13 pm
- Forum: Significant Figures
- Topic: How many sf to carry through in problems with multiple parts
- Replies: 5
- Views: 1164
Re: How many sf to carry through in problems with multiple p
Just to clarify, hypothetically, if part A was a problem with multiple steps of calculations within that one problem would you use use significant figures in each step or only at the end with your final answer?
- Thu Oct 01, 2015 4:33 pm
- Forum: Properties of Light
- Topic: Rydberg Formula
- Replies: 7
- Views: 3046
Re: Rydberg Formula
Can the Rydberg formula only be used for transitions between energy levels of a single hydrogen atom with only one electron? If so, are we expected to know how to calculate the wavelength of light for atoms with multiple electrons?