Search found 25 matches
- Thu Feb 22, 2018 7:06 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: 14.47
- Replies: 1
- Views: 388
14.47
Hi guys I'm stuck number 47 part A:Calculate the reaction quotient, Q, for the following cell reactions, given the measured values of the cell potential. Balance the chemical equations by using the smallest whole- number coefficients. I don't know where the solutions manual got the values for E cath...
- Thu Feb 08, 2018 11:47 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: 11.77
- Replies: 1
- Views: 283
11.77
Does anyone understand how to figure out if a reaction is shifting towards the reactants or products? I'm referring to number 11.77 which states: predict whether the equilibria will shift towards products or reactants when the temperature is increased (a) N2O4(g) <--> 2NO2 (g), delta H= +57 kj.
- Thu Feb 08, 2018 11:04 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: 11.15
- Replies: 12
- Views: 3185
Re: 11.15
Hi, can someone explain why we use this Gibbs free energy equation specifically, thank you.
- Thu Feb 08, 2018 11:03 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: 11.17
- Replies: 10
- Views: 1087
Re: 11.17
Yes there is an error in the solutions manual and Dr.Lavelle has posted the correction on his website. The answer is -2.7 kj/mol.
- Sun Jan 21, 2018 5:56 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 3 Test Topic is endorsed
- Replies: 37
- Views: 4918
Re: Week 3 Test Topic is endorsed
Does anyone know which homework problems from Chapter 8 are the ones we don't need to study for test 1?
- Thu Jan 18, 2018 9:32 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: 8.57
- Replies: 3
- Views: 1025
Re: 8.57
Super helpful! Thank you!
- Thu Jan 18, 2018 5:29 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: 8.57
- Replies: 3
- Views: 1025
8.57
Hi guys I'm having trouble on this problem right here: Determine the reaction enthalpy for the hydrogenation of ethyne to ethane, C2H2(g)+ 2 H2(g) --> C2H6(g), from the following data: Delta Hc (C2H2, g)= -1300. kJ·mol^-1, Delta Hc (C2H6, g)= -1560. kJ·mol^-1, Delta Hc (H2, g)=- 286 kJ·mol^-1. How d...
- Thu Jan 18, 2018 4:24 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: 8.1 question
- Replies: 8
- Views: 824
Re: 8.1 question
Could anyone clarify why a bomb calorimeter in which benzene is burned considered an isolated system? Thank you!
- Sun Dec 10, 2017 9:38 am
- Forum: Hybridization
- Topic: Composition of a Bond
- Replies: 6
- Views: 878
Re: Composition of a Bond
Thanks!
- Sat Dec 09, 2017 2:31 pm
- Forum: Hybridization
- Topic: Composition of a Bond
- Replies: 6
- Views: 878
Re: Composition of a Bond
When we write the composition of bonds for Carbon, why is it that we write a 2 in front of the hybridization, like this C2sp^2?
- Thu Dec 07, 2017 11:51 pm
- Forum: Lewis Acids & Bases
- Topic: 12.13
- Replies: 5
- Views: 912
Re: 12.13
The solutions manual states that Ag+ is a lewis acid, but can anyone explain why? Thank you!
- Tue Dec 05, 2017 1:03 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Determining if something is a strong acid
- Replies: 3
- Views: 867
Re: Determining if something is a strong acid
If we're looking at Lewis Structures how can we tell that one acid is stronger than the other? What should we be looking for? Thank you.
- Tue Dec 05, 2017 2:34 am
- Forum: Conjugate Acids & Bases
- Topic: Acids and Bases [ENDORSED]
- Replies: 8
- Views: 2602
Re: Acids and Bases [ENDORSED]
I think we may be expected to know the most common strong acids and weak acids.
- Tue Dec 05, 2017 12:38 am
- Forum: Conjugate Acids & Bases
- Topic: Acids and Bases [ENDORSED]
- Replies: 8
- Views: 2602
Re: Acids and Bases [ENDORSED]
Hello, how can we tell if the acid is a strong acid or a weak acid?
- Tue Dec 05, 2017 12:35 am
- Forum: Conjugate Acids & Bases
- Topic: Conjugate Acid and Base
- Replies: 5
- Views: 824
Re: Conjugate Acid and Base
Hi guys, what's the difference between a conjugate acid and a weak acid and a conjugate base and a weak base? Thanks.
- Sun Dec 03, 2017 4:56 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Dentates
- Replies: 6
- Views: 920
Re: Dentates
So if we're given the formula of a coordination compound, we must do the lewis structure in order to identify what type of ligand it is?
- Tue Nov 21, 2017 4:58 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Difference Between Kp and Kc
- Replies: 4
- Views: 1298
Re: Difference Between Kp and Kc
How are the equilibrium expression K and the equilibrium expression Kc different? Thank you.
- Fri Nov 17, 2017 10:02 am
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm on myucla
- Replies: 6
- Views: 855
Re: Midterm on myucla
Do you guys know what the average on the midterm was? Thanks!
- Tue Nov 07, 2017 11:26 pm
- Forum: Lewis Structures
- Topic: Where to place lone pairs
- Replies: 2
- Views: 396
Where to place lone pairs
Hi guys, how do we know where exactly to place lone pairs? Like how do we know when to place two sets of lone pairs on one side and when to place them opposite from each other? Thank you in advance.
- Sun Nov 05, 2017 11:53 pm
- Forum: Lewis Structures
- Topic: When to use a double bond or triple bond [ENDORSED]
- Replies: 6
- Views: 48302
When to use a double bond or triple bond [ENDORSED]
Hi guys I'm still a bit confused on when I should use a double or triple bond in a Lewis Structure, can someone clarify please..
- Sun Oct 29, 2017 11:22 pm
- Forum: Lewis Structures
- Topic: Lewis Structure and Resonance
- Replies: 1
- Views: 284
Lewis Structure and Resonance
Just to clarify, does it not matter where we specifically draw the dots on our Lewis structure because of resonance, or does resonance just have to do with bonds that are found in different locations? Thank you!
- Thu Oct 26, 2017 10:57 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: HW Question 2.43
- Replies: 4
- Views: 614
Re: HW Question 2.43
I'm also confused on the electron configuration for Tungsten and [Xe] on 2.43, can someone clarify how the answer is [Xe] 4f^14 5d^4 6s^2.. thank you!
- Mon Oct 16, 2017 10:46 pm
- Forum: Properties of Light
- Topic: Homework 1.33
- Replies: 2
- Views: 389
Homework 1.33
Question 33 reads the velocity of an electron that is emitted from a metallic surface by a photon is 3.6x10^3 km s^-1. a) What is the wavelength of the ejected electron? b) No electrons are emitted from the surface of the metal until the frequency of the radiation reaches 2.50 x10^16 Hz. how much en...
- Thu Oct 12, 2017 10:53 pm
- Forum: Properties of Light
- Topic: 1.15
- Replies: 4
- Views: 553
1.15
Hi guys, does anyone know how to get started on this problem?
In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral line.
In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral line.
- Thu Oct 05, 2017 10:23 pm
- Forum: Limiting Reactant Calculations
- Topic: M3
- Replies: 3
- Views: 1844
M3
Hi guys! So I'm a bit confused on whether CaCO3 is the limiting reactant for this problem right here.. When limestone, which is principally CaCO3, is heated, carbon dioxide and quicklime, CaO, are produced by the reaction CaCO3(s)-->CaO(s)+CO2(g). If 17.5 g of CO2 is produced from the thermal decomp...