Search found 19 matches

by Brianna Wummer 2L
Wed Mar 15, 2017 11:53 am
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: nonplanar vs planar conformations
Replies: 1
Views: 447

Re: nonplanar vs planar conformations

Hi there! Nonplanar conformations are more stable than planar conformations. The only cycloalkane that has a planar conformation is cyclopropane, because there are only 3 carbons. Cycloalkanes with more than 3 carbons will have nonplanar conformations as the most stable, due to reduced bond angle, t...
by Brianna Wummer 2L
Mon Mar 06, 2017 6:01 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Intermediates and transition states
Replies: 1
Views: 283

Re: Intermediates and transition states

Hi there! I think either notation is fine, as long as they are written correctly. Hope that helps!
by Brianna Wummer 2L
Wed Mar 01, 2017 8:46 pm
Forum: *Cycloalkenes
Topic: Naming
Replies: 3
Views: 384

Re: Naming

Hi there! I can answer your second question. If there are two methyl groups, which is dimethyl, alphabetize the dimethyl using the m from methyl. Prefixes are not taken into account when alphabetizing! Hope that helps!
by Brianna Wummer 2L
Wed Feb 22, 2017 7:34 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: General Questions
Replies: 2
Views: 376

Re: General Questions

Hi there! I can answer your third question, "what does it mean that a catalyst is saturated in a 0th order reaction." When a catalyst (or enzyme) is saturated, that means that every enzyme is catalyzing a reactant, or substrate. All enzymes are busy, none are free. So, adding more reactant...
by Brianna Wummer 2L
Tue Feb 14, 2017 11:07 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Winter Midterm 2013 Q2C
Replies: 1
Views: 286

Re: Winter Midterm 2013 Q2C

Hi there! The answer is supposed to be less ice. This can be seen from the equation. Since orange juice has a lower specific heat capacity, less ice will be needed to cool the drink to 16 degrees celsius in comparison to the ice needed to cool the water. Hope that helps!
by Brianna Wummer 2L
Wed Feb 08, 2017 4:53 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Order of Species in balanced equation (matters?)
Replies: 1
Views: 191

Re: Order of Species in balanced equation (matters?)

Hi there! No, I do not think the order of the species matters for tests or in general. I think that it would've been a more stressed point in lecture if the order of the species was very important. I haven't heard anything about a specific order for species in a balanced equation, so I wouldn't worr...
by Brianna Wummer 2L
Wed Feb 01, 2017 3:41 pm
Forum: Balancing Redox Reactions
Topic: Balancing reactions
Replies: 4
Views: 412

Re: Balancing reactions

Hi there! It isn't necessary to double the E(not) because E(not) is a fixed value. It does not depend on the the moles or the numbers of times the reaction occurs or anything. Hope that helps!
by Brianna Wummer 2L
Mon Jan 23, 2017 9:09 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Adiabatic System
Replies: 2
Views: 225

Re: Adiabatic System

Hi there! An adiabatic system has no heat flow (its insulated). Therefore, q will always equal zero. q will never be negative, because no heat can be lost from the system, nor will it be positive, because heat cannot be added to the system. q is always zero for an adiabatic system. Hope that helps!
by Brianna Wummer 2L
Wed Jan 18, 2017 3:01 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Work Integral Negative? [ENDORSED]
Replies: 2
Views: 321

Re: Work Integral Negative? [ENDORSED]

Hey there! w= -P \Delta V is the energy used as work of expansion equation. This means that this equation represents work for the expansion of a system (NOT its surroundings). Using that equation, when an expansion occurs, there is an increase in volume (positive Delta V) and the system is losing en...
by Brianna Wummer 2L
Sat Jan 14, 2017 7:56 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Enthalpies of Formation
Replies: 1
Views: 290

Re: Standard Enthalpies of Formation

Hi there! As far as I know, that formula is only for standard enthalpies of formation. You can't just add the standard enthalpies of formation because unlike Hess's law, we are using enthalpies of each molecule in the chemical equation. In Hess's law, the enthalpies of two separate reactions are add...
by Brianna Wummer 2L
Mon Nov 28, 2016 10:31 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: Icebox
Replies: 4
Views: 618

Re: Icebox

Hi there! I do not think there is ever a time when you use initial moles instead of initial concentration for an ice box question. The i in ice box stands for initial molarity/concentration, and there hasn't been an example question in lecture that has used initial moles instead of concentration/mol...
by Brianna Wummer 2L
Tue Nov 22, 2016 2:15 pm
Forum: Conjugate Acids & Bases
Topic: Determining Weak or Strong Bases/Acids
Replies: 4
Views: 674

Re: Determining Weak or Strong Bases/Acids

Hi there! In lecture on Monday, we learned that there are two properties that make an acid strong/weak. Strong acids lose H+ easily and form very stable anions. In addition, if you are given an acidity or basicity constant, you know that the acid or base is weak because it did not completely ionize ...
by Brianna Wummer 2L
Tue Nov 15, 2016 2:12 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K [ENDORSED]
Replies: 1
Views: 294

Re: K [ENDORSED]

Hi there! Kᶜ is just a more specific notation for K. I don't think that it specifically needs to be used in place of K. In the course reader, it is stated that K is often used to represent Kᶜ or Kp. K is just a broader variable, and I think it can be used in any situation regarding an equilibrium co...
by Brianna Wummer 2L
Tue Nov 08, 2016 4:30 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Relationship between bond order and bond length?
Replies: 2
Views: 1821

Re: Relationship between bond order and bond length?

Hi there! Actually, the longer the bond length, the smaller the bond order. A higher bond order corresponds to shorter and stronger bonds. For example, a bond order of 1 corresponds to a single bond, which is a long and weak bond. A bond order of 2 corresponds to a double bond, which is stronger and...
by Brianna Wummer 2L
Mon Oct 31, 2016 6:22 pm
Forum: Administrative Questions and Class Announcements
Topic: MO Diagrams on Midterm?
Replies: 2
Views: 427

Re: MO Diagrams on Midterm?

Hi. Yes, you are correct! The Molecular Orbital Theory (including its diagrams) will not be on the midterm. Hope that helps :)
by Brianna Wummer 2L
Mon Oct 24, 2016 10:47 pm
Forum: Bond Lengths & Energies
Topic: Double Bond vs Triple Bond
Replies: 7
Views: 620

Re: Double Bond vs Triple Bond

Hi! I think that for the purpose of the class, we can assume that triple bonds are stronger than double bonds, especially since the exceptions weren't mentioned in lecture to my knowledge. Hope that helps!
by Brianna Wummer 2L
Wed Oct 12, 2016 7:10 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Clarification on ENERGY LEVEL concept
Replies: 3
Views: 1762

Re: Clarification on ENERGY LEVEL concept

I don't think that the equation you memorize and use in quizzes matters, as long as you use it correctly! They should give you the same answer if applied correctly. So, just be sure to know how to apply the equation you wish to use, and you should be fine for the quiz.
by Brianna Wummer 2L
Thu Oct 06, 2016 7:57 pm
Forum: *Black Body Radiation
Topic: Testable Black-Body Information [ENDORSED]
Replies: 1
Views: 412

Re: Testable Black-Body Information [ENDORSED]

The equations regarding black body radiation are not on our provided formula sheet (i think) and they weren't ever mentioned in lecture, so I would assume we don't need to know them or how to use them.
by Brianna Wummer 2L
Tue Sep 27, 2016 9:12 pm
Forum: Significant Figures
Topic: Sig Figs Throughout Problems
Replies: 12
Views: 2887

Re: Sig Figs Throughout Problems

I would use the values given on the periodic table that we were provided or the values given in the problem, even if there are more decimal places than you are used to. My TA also said that its better to use the whole number given and only round to the correct sig figs at the end, as it provides the...

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