Search found 22 matches

by Samantha Rundle 3K
Fri Mar 11, 2016 3:25 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Cis and trans Vs. Z and E
Replies: 3
Views: 381

Re: Cis and trans Vs. Z and E

Why is it inappropriate to use cis and trans when you are not using two carbons and two hydrogens?

Thank you!
by Samantha Rundle 3K
Sun Mar 06, 2016 5:00 pm
Forum: *Cyclopropanes and Cyclobutanes
Topic: Torsional vs Steric Strain
Replies: 1
Views: 369

Torsional vs Steric Strain

Is there any correlation between steric strain and torsional strain?

Thank you!
by Samantha Rundle 3K
Sun Feb 28, 2016 11:22 pm
Forum: *Electrophiles
Topic: Saturated and Unsaturated Hydrocarbons
Replies: 2
Views: 301

Re: Saturated and Unsaturated Hydrocarbons

Saturated hydrocarbons also have a lot more hydrogens attached to each carbon because of the lack of double and triple bonds. I like to think they are "saturated" with hydrogens.
by Samantha Rundle 3K
Sun Feb 21, 2016 6:49 pm
Forum: *Nucleophiles
Topic: Intermediate Line
Replies: 2
Views: 301

Intermediate Line

Why does the intermediate line that is drawn through the activation energy curve have to be on the same level as the reactants?

Thanks!
by Samantha Rundle 3K
Sun Feb 14, 2016 4:27 pm
Forum: *Complex Reaction Coordinate Diagrams
Topic: Reaction Steps Given
Replies: 1
Views: 436

Reaction Steps Given

When doing problems where we have to figure out which step is the slow step, will we ever be expected to write out the reaction for each step? If so, what information will be given and how would we go about making the reactions?

Thanks!
by Samantha Rundle 3K
Sun Feb 07, 2016 10:20 am
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: Ideal Gas with no specific heat capacity
Replies: 1
Views: 337

Ideal Gas with no specific heat capacity

I understand that when you are asked to use an ideal gas without a specific heat value, you use C(vol)=3/2R when it is monatomic, C(vol)=5/2R when it is diatomic, and C(vol)=3R when it is polyatomic. I was wondering what determines the value of the coefficient in each case.

Thank you!
by Samantha Rundle 3K
Sun Jan 31, 2016 5:06 pm
Forum: Balancing Redox Reactions
Topic: 2 Half Reactions
Replies: 2
Views: 294

2 Half Reactions

Dr. Lavelle said that when you are just given two half reactions to reverse the one with the smaller E value, so that the cell potential is positive, meaning electrons flow left to right. What are the effects of a reversing the half reaction with a larger E?

Thank you!
by Samantha Rundle 3K
Sun Jan 24, 2016 9:03 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: When to use Hess's Law
Replies: 1
Views: 382

When to use Hess's Law

When calculating enthalpy of a reaction, if the enthalpies of each compound are provided, I use the sum of the enthalpies of the products, minus those of the reactants, but in some cases, the enthalpy of each compound is provided, but Hess's Law must be used to calculate the enthalpy of the reaction...
by Samantha Rundle 3K
Sun Jan 17, 2016 1:47 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Degeneracy
Replies: 3
Views: 562

Degeneracy

I understand that degeneracy is the number of ways of achieving a given energy state, and that the more ways there are makes a higher degeneracy, but it is better to have a higher or lower degeneracy?
by Samantha Rundle 3K
Sat Jan 09, 2016 10:58 pm
Forum: Phase Changes & Related Calculations
Topic: Cp and Csp
Replies: 1
Views: 2708

Re: Cp and Csp

The course reader says that Cp is the molar heat capacity of a gas at constant pressure. Csp stands for the specific heat capacity of a gas at constant pressure. So Cp is the heat required to raise the tempurature of one mole of a gas by one degree celsius at constant pressure, and Csp is the heat r...
by Samantha Rundle 3K
Fri Dec 04, 2015 10:11 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: Henderson-Hasselbalch in the Buffer Region
Replies: 1
Views: 261

Henderson-Hasselbalch in the Buffer Region

I understand that in titrations, at the half stoichiometric point the pH=pKa, so that is when the the Henderson Hasselbalch equation should be used, but can't we use it for the whole buffer region of a titration, or is that wrong because [HA] does not equal [A-]?

Thanks!
by Samantha Rundle 3K
Sun Nov 29, 2015 2:41 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: Buffer Capacity
Replies: 1
Views: 350

Buffer Capacity

If we are told to find the pH of a buffer and it is not equal to the pKa, does that mean the buffer is weak?

Thanks!
by Samantha Rundle 3K
Sun Nov 22, 2015 10:27 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH below or above 7 or neutral
Replies: 4
Views: 1105

Re: pH below or above 7 or neutral

If you calculate the pH and it comes out neutral, is that similar to being a very weak acid or is it a different state completely? Also when a weak acid has a pH less than 10^-7, does that mean that it barely dissociates, because strong acids and bases dissociate completely?
by Samantha Rundle 3K
Sun Nov 15, 2015 4:14 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Writing Formulas for Ionic Compounds
Replies: 1
Views: 391

Writing Formulas for Ionic Compounds

For the homework there are examples where we have to include "ion" when naming a compound that has a charge, but when converting the name to the formula, none of them had "ion" in their names. If we did have to write out the compound for an ion, would it tell us the charge needed...
by Samantha Rundle 3K
Sun Nov 08, 2015 6:21 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelating Complexes
Replies: 5
Views: 604

Re: Chelating Complexes

I understand the definition of a chelating complex, but how would one go about identifying whether or not a molecule can form a chelating complex by looking at lewis structures like in problem 17.35 in the homework?
by Samantha Rundle 3K
Sun Nov 01, 2015 9:28 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Magnetism and Stability
Replies: 1
Views: 245

Magnetism and Stability

If a diamagnetic molecule's highest occupied molecular orbital is anti-bonding, its bond order would be less. Does this mean that there is no relation between magnetism and stability?
by Samantha Rundle 3K
Sun Oct 25, 2015 12:24 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Determining Resonance
Replies: 3
Views: 518

Determining Resonance

Is there a quicker way to determine if there are resonance structures, other than calculating formal charge? If so, how?

Thanks!
by Samantha Rundle 3K
Sat Oct 17, 2015 10:30 pm
Forum: Octet Exceptions
Topic: Expanded Octet
Replies: 9
Views: 1232

Re: Expanded Octet

Why can P, S, and Cl accommodate more than 8 valence electrons? I know the course reader says they have d-orbitals in the valence shell that accommodate additional electrons, but I'm not sure I understand what that means because their electrons do not occupy a d-orbital. Can somebody please clarify?...
by Samantha Rundle 3K
Sun Oct 11, 2015 4:26 am
Forum: Trends in The Periodic Table
Topic: Sizes of an atom
Replies: 2
Views: 390

Re: Sizes of an atom

This is also why atom size decreases across the periodic table, because of the increase in protons in the nucleus and the increase of electrons in the same shell draws the electrons in; however, when moving down a group the size will increase because the added shells place electrons further from the...
by Samantha Rundle 3K
Sun Oct 11, 2015 3:46 am
Forum: Significant Figures
Topic: All students read this sig fig post [ENDORSED]
Replies: 91
Views: 9149

Re: All students read this sig fig post [ENDORSED]

Are we supposed to have the correct sig figs for each step or just the final answer?

Thanks!
by Samantha Rundle 3K
Fri Oct 02, 2015 9:48 pm
Forum: Properties of Electrons
Topic: Ground State
Replies: 2
Views: 399

Re: Ground State

Thank you so much!
by Samantha Rundle 3K
Fri Oct 02, 2015 1:20 pm
Forum: Properties of Electrons
Topic: Ground State
Replies: 2
Views: 399

Ground State

I understand that different atoms have different ground states, but when we are asked questions, where the ground state is not n=1, will the ground state always be given or are there ways to solve for it?


Thank you!
Samantha Rundle

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