Search found 26 matches

by Hayley Hammons 1L
Fri Mar 11, 2016 6:29 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Cv and Cp
Replies: 4
Views: 508

Re: Cv and Cp

What C do we use if only volume is changing and temperature and pressure are constant? (for a monatomic ideal gas?)
by Hayley Hammons 1L
Fri Mar 04, 2016 1:35 pm
Forum: *Alcohols
Topic: Naming priority between double bond and functional group
Replies: 4
Views: 4893

Re: Naming priority between double bond and functional group

When the molecule consists of alkyl groups alone, the double and triple bonds take priority in numbering. When a functional group is added, such as -OH in alcohols, the carbon attached to the -OH takes priority and is numbered as the first carbon. This is due to the idea that the alcohol functional ...
by Hayley Hammons 1L
Thu Mar 03, 2016 10:22 pm
Forum: *Haloalkenes
Topic: (E)-3-Chloro-4-fluoro-7-methyloct-3-en-5-yne
Replies: 3
Views: 739

Re: (E)-3-Chloro-4-fluoro-7-methyloct-3-en-5-yne

Since when do substituents take priority? I thought double and triple bonds always took priority in numbering over substituents. Or is this only true when the substituents are alkyl groups?
by Hayley Hammons 1L
Mon Feb 29, 2016 10:10 pm
Forum: *Electrophiles
Topic: What is -ylium?
Replies: 1
Views: 484

Re: What is -ylium?

The suffix -ylium means that the -yl group is in isolation, making one atom positively charged, which must be specified. For example, +CH3 is methylium, and (CH3)2CH+ is propan-2-ylium.
by Hayley Hammons 1L
Mon Feb 29, 2016 2:51 pm
Forum: *Ketones
Topic: 'R' Groups
Replies: 2
Views: 682

'R' Groups

What are the 'R' groups or atoms that are part of the Lewis structure for ketones and aldehydes?
by Hayley Hammons 1L
Fri Feb 26, 2016 12:43 pm
Forum: *Alkanes
Topic: polarizability/nucleophiles
Replies: 2
Views: 1058

Re: polarizability/nucleophiles

Br is a larger molecule than F-, giving it a larger atomic radius and a larger bonding region where the valence electrons are further away from the nucleus, allowing for easier polarization. This ease in polarization increases the likelihood that the valence electrons can be used to form a sigma bon...
by Hayley Hammons 1L
Mon Feb 08, 2016 5:20 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Entropy of Aqueous Ions
Replies: 1
Views: 1303

Entropy of Aqueous Ions

Why is entropy negative for many aqueous ions listed in Appendix 2A of the textbook?
by Hayley Hammons 1L
Mon Feb 08, 2016 10:33 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Homework Question 8.99
Replies: 2
Views: 406

Re: Homework Question 8.99

Oh I see, that makes perfect sense now. Thanks!
by Hayley Hammons 1L
Sun Feb 07, 2016 5:18 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat Capacity of a Monoatomic Ideal Gas (9.13)
Replies: 7
Views: 810

Re: Heat Capacity of a Monoatomic Ideal Gas (9.13)

Referring to the original question, the solution manual should have used Cv=5/2R instead of just R when calculating part b for ∆T. This correction is listed under solution manual errors on the Chemistry 14B website.
by Hayley Hammons 1L
Sun Feb 07, 2016 12:33 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Homework Question 8.99
Replies: 2
Views: 406

Homework Question 8.99

Q: Hydrochloric acid oxidizes zinc metal in a reaction that produces hydrogen gas and chloride ions. A piece of zinc metal of mass 8.5g is dropped into an apparatus containing 800.0mL of 0.500M HCl(aq). If the initial temperature of the hydrochloric acid solution is 25ºC, what is the final temperatu...
by Hayley Hammons 1L
Fri Feb 05, 2016 9:41 am
Forum: Balancing Redox Reactions
Topic: Potentil Difference
Replies: 1
Views: 234

Re: Potentil Difference

Cell potential is a measure of the cell's ability to do work. For two half reactions, (oxidation and reduction) you can take the potential (E) of each and find the difference between them to see if the reaction can do work. If the difference you calculate is positive (+VE), then the redox reaction o...
by Hayley Hammons 1L
Fri Jan 29, 2016 7:54 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Ion-Selective Electrodes
Replies: 1
Views: 307

Ion-Selective Electrodes

Why do you need a special electrode (ion-selective) to measure the pH of a solution in a redox reaction?
by Hayley Hammons 1L
Sat Jan 23, 2016 1:23 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Calculating the Energy Changes When Heating an Ideal Gas
Replies: 1
Views: 242

Calculating the Energy Changes When Heating an Ideal Gas

From example 8.6: Calculate the final temperature and the change in internal energy when 500. J of energy is transferred as heat to 0.900 mol O2 gas at 298K and 1.00 atm at (a) constant volume and (b) constant pressure. Treat the gas as ideal. In the book it says that part b requires two steps: heat...
by Hayley Hammons 1L
Fri Jan 15, 2016 11:16 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Degeneracy
Replies: 2
Views: 312

Degeneracy

How is degeneracy used to predict the likelihood that a system will be in a particular state?
by Hayley Hammons 1L
Fri Jan 08, 2016 11:27 am
Forum: Phase Changes & Related Calculations
Topic: Standard Enthalpy
Replies: 2
Views: 368

Standard Enthalpy

What conditions make the enthalpy of a reaction standard?
by Hayley Hammons 1L
Fri Dec 04, 2015 12:22 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Finding K for an Acid/Base Reaction
Replies: 1
Views: 932

Finding K for an Acid/Base Reaction

In homework problem 12.117 the question states "write the equilibrium constant for the reaction and calculate the value of K at 298K for the reaction HNO2(aq) + NH3(aq) <--> NH4+(aq) + NO2-(aq) using the data in tables 21.1 an 12.2. From the tables, we know that Ka of HNO2 is 4.3E-4 and the Kb ...
by Hayley Hammons 1L
Fri Nov 27, 2015 3:17 pm
Forum: Hybridization
Topic: Hybridization and Radicals
Replies: 1
Views: 380

Hybridization and Radicals

If an atom in a molecule is a radical, having one unpaired electron, is it still included in hybridization?
For example, if a carbon has three of its valence electrons bonded to other atoms, and its fourth valence electron stands alone unpaired, does carbon have a sp^2 or sp^3 hybridization?
by Hayley Hammons 1L
Fri Nov 20, 2015 3:42 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 127
Views: 75123

Re: Reading the textbook [ENDORSED]

Yes, I read the textbook and takes notes on information that comes up in the course reader. It takes a while but I find it really helpful for memory because you're writing down key concepts and it provides great examples and explanations that I can associate with concepts to help me remember them. I...
by Hayley Hammons 1L
Thu Nov 19, 2015 10:18 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Ignoring x in Chemical Equilibrium
Replies: 4
Views: 989

Ignoring x in Chemical Equilibrium

In what cases can we assume that x makes a negligible difference when calculating change in concentration for a molecule in an equilibrium expression? When can we ignore it so that it makes the math of calculating change for other molecules in the reaction easier?
by Hayley Hammons 1L
Fri Nov 13, 2015 3:31 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Inert Gasses
Replies: 1
Views: 294

Inert Gasses

How do inert gasses affect chemical equilibrium?
by Hayley Hammons 1L
Fri Nov 06, 2015 2:12 pm
Forum: Naming
Topic: Naming
Replies: 3
Views: 472

Re: Naming

1. write ligands in alphabetical order
2. write metal
3. write oxidation state
by Hayley Hammons 1L
Fri Nov 06, 2015 2:08 pm
Forum: Naming
Topic: Ligands and Transition Metal Bonding
Replies: 2
Views: 401

Ligands and Transition Metal Bonding

What is the conceptual reasoning that explains why ligands can bond to transition metals?
by Hayley Hammons 1L
Fri Oct 30, 2015 1:41 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: D-orbitial electron configuration
Replies: 1
Views: 309

D-orbitial electron configuration

When writing the electron configuration for an atom with electrons in the d-orbital, how do you know whether the s or d orbital will fill first? For example, why is chromium written as 3d5 4s1 instead of 3d4 42s?
by Hayley Hammons 1L
Sun Oct 18, 2015 4:48 pm
Forum: Quantum Numbers and The H-Atom
Topic: Negative electron energy
Replies: 2
Views: 509

Negative electron energy

Why are all energies negative in the Schrödinger equation for energy of an electron?
by Hayley Hammons 1L
Fri Oct 16, 2015 6:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VESPR bond angles
Replies: 4
Views: 470

VESPR bond angles

How do you determine the bond angle of a compound?
by Hayley Hammons 1L
Wed Oct 07, 2015 9:54 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Election Configuration - d orbital
Replies: 2
Views: 447

Election Configuration - d orbital

Under what conditions is the 3d orbital written before the 4s orbital when writing election configurations?

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