Search found 45 matches
- Sat Mar 12, 2016 10:38 pm
- Forum: *Calculations Using ΔG° = -RT ln K
- Topic: Vocabulary
- Replies: 13
- Views: 4673
Re: Vocabulary
Yes. Remember in regards to the graphs. It helps!
- Fri Mar 11, 2016 5:45 pm
- Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
- Topic: Torsional strain
- Replies: 4
- Views: 1059
Re: Torsional strain
Is it possible to have negative strain at all?
- Mon Mar 07, 2016 1:12 pm
- Forum: *Nucleophiles
- Topic: Double Bonds
- Replies: 3
- Views: 809
Re: Double Bonds
It is also easy to note that the double bond is what will be broken to provide electrons to the electron deficient molecule (electrophile).
- Sun Mar 06, 2016 2:55 pm
- Forum: *Identifying Primary, Secondary, Tertiary, Quaternary Carbons, Hydrogens, Nitrogens
- Topic: Trans and Cis
- Replies: 2
- Views: 914
Re: Trans and Cis
I believe the drawing must be provided in any case this question would come up. The only way to tell the difference is really through the lewis structure of the molecule.
- Tue Mar 01, 2016 11:16 pm
- Forum: *Cycloalkanes
- Topic: Quiz 3
- Replies: 2
- Views: 710
Re: Quiz 3
Yes. The only difference with alkenes and cycloalkenes is a double bond. Just keep an eye out for double bonds and then you know to change the ane to ene.
It is also in the reading for chapter 1 assigned for the quiz.
It is also in the reading for chapter 1 assigned for the quiz.
- Mon Feb 29, 2016 11:06 pm
- Forum: *Cycloalkenes
- Topic: Dienes
- Replies: 1
- Views: 512
Re: Dienes
I cannot say for certain if we will need to include conjugated or unconjugated, but just know to label diene for two double bonds and triene for three and so on.
- Sun Feb 28, 2016 1:53 pm
- Forum: *Nucleophiles
- Topic: Nucleophile strength?
- Replies: 2
- Views: 820
Re: Nucleophile strength?
In a question of say "which is more nucleophilic" or say "which is the stronger nucleophile" you must look at polarizability of the elements in question. The higher the polarizability (the more electrons, the more free flowing) the stronger the nucleophile.
- Thu Feb 25, 2016 11:24 pm
- Forum: *Electrophiles
- Topic: Electrophiles vs Nucelophiles
- Replies: 2
- Views: 660
Electrophiles vs Nucelophiles
Any quick tips on determining whether an element/compound is an electrophile or nucleophile?
- Wed Feb 24, 2016 10:44 am
- Forum: *Alkanes
- Topic: Naming with Multplie Substituents
- Replies: 2
- Views: 463
Re: Naming with Multplie Substituents
Prefixes on the substituents do not affect the order of the substituents in the final compound name. Remember: the substituents are always alphabetical order disregarding their prefixes.
Re: IUPAC
One thing to remember when listing the substituents alphabetically is that no matter the prefix placed in front of the substituent, they are still listed in alphabetical order. In simpler terms, the prefix does not affect the listing order of substituents.
- Mon Feb 22, 2016 1:28 pm
- Forum: *Electrophiles
- Topic: Memory Tips
- Replies: 8
- Views: 1841
Re: Memory Tips
In class today it was mentioned that nucleophiles are basically another term for Lewis bases, so if you can remember that you can make the distinction that nucleophiles are electron rich.
- Tue Feb 16, 2016 5:16 pm
- Forum: Second Order Reactions
- Topic: Linear Graphs
- Replies: 5
- Views: 5418
Re: Linear Graphs
There have been no graph questions in the textbook homework, so I was wondering what some examples might be to prepare should it show up on our quiz?
- Tue Feb 16, 2016 4:10 pm
- Forum: *Electrophiles
- Topic: Why F, Cl, Br, I are electrophiles?
- Replies: 4
- Views: 2329
Re: Why F, Cl, Br, I are electrophiles?
Thank you so much for the clarification.
- Mon Feb 15, 2016 3:56 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Textbook Problems 15.3 and 15.5
- Replies: 7
- Views: 1085
Re: Textbook Problems 15.3 and 15.5
In the solutions manual, 15.3 part c is depicted as the second b.
- Sat Feb 13, 2016 11:04 pm
- Forum: *Electrophiles
- Topic: Why F, Cl, Br, I are electrophiles?
- Replies: 4
- Views: 2329
Re: Why F, Cl, Br, I are electrophiles?
May you further elaborate on what electrophiles are and what are the determining factors?
- Sun Feb 07, 2016 8:11 pm
- Forum: Van't Hoff Equation
- Topic: Van't Hoff Equation
- Replies: 5
- Views: 1895
Re: Van't Hoff Equation
What type of wording in a question would lead us to use this equation?
- Thu Feb 04, 2016 5:11 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Discerning what is being reduced and oxidized? HW 14.15a
- Replies: 2
- Views: 664
Re: Discerning what is being reduced and oxidized? HW 14.15a
Anytime an element is alone such as Ag is the charge is 0? Is that the best way to determine in a situation like this reaction what is the anode and what is the cathode?
- Thu Feb 04, 2016 5:09 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Writing Cell diagram with Pt
- Replies: 2
- Views: 657
Re: Writing Cell diagram with Pt
When the reaction does not have conducting solids, platinum or graphite, both inert conductors, are incorporated into the cell diagram as an electrode to transfer electrons.
- Thu Feb 04, 2016 5:06 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Writing cell diagram: figuring out order
- Replies: 2
- Views: 587
Re: Writing cell diagram: figuring out order
I typically just remember it having the solids on the outermost part of the cell diagram.
- Tue Feb 02, 2016 6:40 pm
- Forum: Balancing Redox Reactions
- Topic: Helpful Tip
- Replies: 2
- Views: 544
Re: Helpful Tip
LOVE THIS! Thank you for sharing!
- Tue Feb 02, 2016 6:39 pm
- Forum: Balancing Redox Reactions
- Topic: 14.1 Book HW
- Replies: 3
- Views: 760
Re: 14.1 Book HW
That makes complete sense, but say for question 14.3 where S is technically 2- as well as O, how do you determine that in SO42- that S has to have the oxidation number 6+?
- Mon Feb 01, 2016 9:29 am
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Useful Summary of Thermodynamic Definitions
- Replies: 55
- Views: 18587
Re: Useful Summary of Thermodynamic Definitions
This is great! Thank you for sharing these key terms in such a simple and concise way! These terms are essential to memorize for future quizzes and tests.
- Fri Jan 29, 2016 1:50 pm
- Forum: Balancing Redox Reactions
- Topic: Identifying anodes and cathodes
- Replies: 2
- Views: 685
Re: Identifying anodes and cathodes
As Lavelle mentioned in class today, the best way is by determining which element is involved in reduction and which is being oxidized. When it comes to oxidation and reduction determining, you must approach the reaction systematically by determining the compound that when reduced will still allow t...
- Fri Jan 29, 2016 1:47 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Extensive and Intensive
- Replies: 4
- Views: 909
Re: Extensive and Intensive
Pertaining to today's lesson, an extensive property directly involves how much of a something is presented in a reaction, while with an intensive property, the amount present in essentially irrelevant to the concluding calculations.
- Sun Jan 24, 2016 6:29 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Approach to Bond Enthalpies
- Replies: 1
- Views: 277
Approach to Bond Enthalpies
Is the only way to approach a question asking one to solve for the bond enthalpies by first drawing out the lewis structures and determining where bonds are broken and formed? Is there a simpler way to go about solving these problems? What is the best method overall?
- Sat Jan 23, 2016 9:39 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: How to find enthalpy of rxn using enthalpies of formation?
- Replies: 2
- Views: 622
Re: How to find enthalpy of rxn using enthalpies of formatio
I was just reviewing this question as well, so basically because O2 and N2 are not included in the overall calculation of enthalpy because "by definition, the standard enthalpy of formation of an element in its most stable form is zero."
- Sat Jan 23, 2016 10:55 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Calculating q (Enthalpy)
- Replies: 2
- Views: 535
Re: Calculating q (Enthalpy)
If q is provided with units including mol-1/grams-1, then incorporating n into the final equation is incorrect. It is essential to look at the units for every calculated value in order to implement the right equations. I suggest ALWAYS writing out units for every number that way it is easy to notice...
- Sat Jan 23, 2016 10:50 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Calculating the energy changes when heating an ideal gas
- Replies: 2
- Views: 517
Re: Calculating the energy changes when heating an ideal gas
Have we seen any examples in the course reader or textbook in which we needed to implement the linear/nonlinear molecule equations?
- Sun Jan 17, 2016 1:04 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Homework Problem 8.73
- Replies: 4
- Views: 1440
Re: Homework Problem 8.73
Thank you Reine. An addition question I have is about calculating bond enthalpies in general. Is it most cases that bonds are broken and new ones formed?
- Thu Jan 14, 2016 3:22 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Homework Problem 8.73
- Replies: 4
- Views: 1440
Homework Problem 8.73
Starting with example (a), I understand the Carbon bonds are being broken, however, I am confused why the solutions manual explains the Carbon-Carbon bonds being broken as triple bonds. When I consult the Mean Bond Enthalpies Table (8.7), there are a few options for Carbon-Carbon bonds. Is there a c...
- Sun Jan 10, 2016 5:20 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: bond enthalpies
- Replies: 2
- Views: 614
Re: bond enthalpies
An endothermic reaction occurs when it takes more energy to break bonds in the reactants than what is released when new bonds for in the products. An exothermic reaction occurs when more energy is released when new bonds form in products than what is used when bonds in the reactants are broken. It i...
- Sat Dec 05, 2015 9:10 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: strength of acids/ bases
- Replies: 3
- Views: 1009
Re: strength of acids/ bases
I would memorize the 6 strong acids in the course reader, there really are not many more beyond those. (hydrochloric acid - HCl, hydrobromic acid - HBr, hydroiodic acid - HI, sulfuric acid - H2SO4, nitric acid - HNO3, perchloric acid - HClO4).
- Sat Dec 05, 2015 8:37 pm
- Forum: Conjugate Acids & Bases
- Topic: NH4+ and NH3
- Replies: 3
- Views: 15602
Re: NH4+ and NH3
It pertains the the conjugate seesaw rule: the stronger the acid, the weaker the conjugate base; the stronger the base, the weaker the conjugate acid.
- Mon Nov 30, 2015 7:57 pm
- Forum: Conjugate Acids & Bases
- Topic: Percentage Deprotonated
- Replies: 3
- Views: 983
Re: Percentage Deprotonated
Great thank you. But in other cases the ratio is not always one-to-one? And sometimes A- is not equivalent to H3O+?
- Sun Nov 29, 2015 3:16 pm
- Forum: Conjugate Acids & Bases
- Topic: Percentage Deprotonated
- Replies: 3
- Views: 983
Percentage Deprotonated
When calculating the percentage, it is the concentration of A- divided by the initial concentration of HA times 100%. In the textbook it says it is also H3O+ divided by initial concentration. I am confused because when making the ice block chart, H3O+ is different than A-. Clarification please...
- Sun Nov 22, 2015 12:57 pm
- Forum: Biological Examples
- Topic: Important Metals for Biology [ENDORSED]
- Replies: 4
- Views: 8510
Re: Important Metals for Biology [ENDORSED]
The main ones to note, however, are Iron, Chromium, Cobalt, and Mn, Ni, Cu, Zn.
- Sat Nov 21, 2015 2:37 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Weak acids and equations
- Replies: 3
- Views: 906
Re: Weak acids and equations
Are Ka and Kb inversely proportional? I remember going over some aspect of the relationship in class...
- Sat Nov 21, 2015 2:35 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Equilibrium Constant
- Replies: 7
- Views: 1253
Re: Equilibrium Constant
Is it then that Ka and Kb are inversely proportional?
- Sat Nov 14, 2015 1:54 pm
- Forum: Naming
- Topic: Naming of Coordination Compounds
- Replies: 2
- Views: 466
Re: Naming of Coordination Compounds
Thank you! The case is the same for other anionic elements right? Like cobalt can be cobaltate?
- Fri Nov 13, 2015 9:18 am
- Forum: Naming
- Topic: Naming of Coordination Compounds
- Replies: 2
- Views: 466
Naming of Coordination Compounds
In my discussion section earlier this week, we looked at a coordination compound including Iron (Fe). When we named the structure, rather than labeling it iron, instead we named it using its symbol Fe. I am confused about when you call it by its name and when by its symbol with some prefix attached?
- Sat Nov 07, 2015 4:28 pm
- Forum: Photoelectric Effect
- Topic: Work Function vs De Broglie
- Replies: 4
- Views: 4905
Work Function vs De Broglie
Looking back at my notes from chapter one, I am confused about when to use just E=hv and when to actually use Ephoton = Ek + work function. Can someone please clarify, especially with the midterm question.
- Mon Nov 02, 2015 1:00 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Schrodinger + MO Theory
- Replies: 1
- Views: 420
Schrodinger + MO Theory
Can someone please clarify how Schrodinger wave function ties into Molecular Orbital Theory.
- Wed Oct 21, 2015 11:47 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Determining Shape
- Replies: 2
- Views: 418
Determining Shape
When determining the shape of a compound, how can it be labeled as both tetrahedral and trigonal pyramidal?
- Mon Oct 12, 2015 5:31 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Overall Charge Calculations
- Replies: 1
- Views: 532
Overall Charge Calculations
How do you determine which numbers to add/subtract when calculating the overall charge in relation to the Lewis Structure?
- Sun Oct 04, 2015 10:38 pm
- Forum: General Science Questions
- Topic: Ions
- Replies: 1
- Views: 887
Ions
What's the difference between a cation and an anion?