Search found 26 matches
- Fri Mar 11, 2016 6:29 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Cv and Cp
- Replies: 4
- Views: 1069
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?)
- Fri Mar 04, 2016 1:35 pm
- Forum: *Alcohols
- Topic: Naming priority between double bond and functional group
- Replies: 4
- Views: 15782
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 ...
- Thu Mar 03, 2016 10:22 pm
- Forum: *Haloalkenes
- Topic: (E)-3-Chloro-4-fluoro-7-methyloct-3-en-5-yne
- Replies: 3
- Views: 1611
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?
- Mon Feb 29, 2016 10:10 pm
- Forum: *Electrophiles
- Topic: What is -ylium?
- Replies: 1
- Views: 1122
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.
- Mon Feb 29, 2016 2:51 pm
- Forum: *Ketones
- Topic: 'R' Groups
- Replies: 2
- Views: 1441
'R' Groups
What are the 'R' groups or atoms that are part of the Lewis structure for ketones and aldehydes?
- Fri Feb 26, 2016 12:43 pm
- Forum: *Alkanes
- Topic: polarizability/nucleophiles
- Replies: 2
- Views: 3671
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...
- 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: 2842
Entropy of Aqueous Ions
Why is entropy negative for many aqueous ions listed in Appendix 2A of the textbook?
- 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: 711
Re: Homework Question 8.99
Oh I see, that makes perfect sense now. Thanks!
- 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: 1505
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.
- 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: 711
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...
- Fri Feb 05, 2016 9:41 am
- Forum: Balancing Redox Reactions
- Topic: Potentil Difference
- Replies: 1
- Views: 412
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...
- 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: 469
Ion-Selective Electrodes
Why do you need a special electrode (ion-selective) to measure the pH of a solution in a redox reaction?
- 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: 427
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...
- Fri Jan 15, 2016 11:16 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Degeneracy
- Replies: 2
- Views: 514
Degeneracy
How is degeneracy used to predict the likelihood that a system will be in a particular state?
- Fri Jan 08, 2016 11:27 am
- Forum: Phase Changes & Related Calculations
- Topic: Standard Enthalpy
- Replies: 2
- Views: 593
Standard Enthalpy
What conditions make the enthalpy of a reaction standard?
- 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: 1870
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 ...
- Fri Nov 27, 2015 3:17 pm
- Forum: Hybridization
- Topic: Hybridization and Radicals
- Replies: 1
- Views: 741
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?
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?
- Fri Nov 20, 2015 3:42 pm
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 146732
Re: Reading the textbook
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...
- Thu Nov 19, 2015 10:18 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Ignoring x in Chemical Equilibrium
- Replies: 4
- Views: 1886
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?
- 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: 518
Inert Gasses
How do inert gasses affect chemical equilibrium?
Re: Naming
1. write ligands in alphabetical order
2. write metal
3. write oxidation state
2. write metal
3. write oxidation state
- Fri Nov 06, 2015 2:08 pm
- Forum: Naming
- Topic: Ligands and Transition Metal Bonding
- Replies: 2
- Views: 610
Ligands and Transition Metal Bonding
What is the conceptual reasoning that explains why ligands can bond to transition metals?
- Fri Oct 30, 2015 1:41 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: D-orbitial electron configuration
- Replies: 1
- Views: 509
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?
- Sun Oct 18, 2015 4:48 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Negative electron energy
- Replies: 2
- Views: 847
Negative electron energy
Why are all energies negative in the Schrödinger equation for energy of an electron?
- Fri Oct 16, 2015 6:48 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VESPR bond angles
- Replies: 4
- Views: 826
VESPR bond angles
How do you determine the bond angle of a compound?
- Wed Oct 07, 2015 9:54 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Election Configuration - d orbital
- Replies: 2
- Views: 739
Election Configuration - d orbital
Under what conditions is the 3d orbital written before the 4s orbital when writing election configurations?