Search found 25 matches

by Essly Mendoza 1J
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: 128

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...
by Essly Mendoza 1J
Thu Feb 08, 2018 11:47 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 11.77
Replies: 1
Views: 87

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.
by Essly Mendoza 1J
Thu Feb 08, 2018 11:04 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 11.15
Replies: 8
Views: 476

Re: 11.15

Hi, can someone explain why we use this Gibbs free energy equation specifically, thank you.
by Essly Mendoza 1J
Thu Feb 08, 2018 11:03 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 11.17
Replies: 10
Views: 375

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.
by Essly Mendoza 1J
Sun Jan 21, 2018 5:56 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 3 Test Topic is endorsed
Replies: 37
Views: 1927

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?
by Essly Mendoza 1J
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: 276

Re: 8.57

Super helpful! Thank you!
by Essly Mendoza 1J
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: 276

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...
by Essly Mendoza 1J
Thu Jan 18, 2018 4:24 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: 8.1 question
Replies: 8
Views: 286

Re: 8.1 question

Could anyone clarify why a bomb calorimeter in which benzene is burned considered an isolated system? Thank you!
by Essly Mendoza 1J
Sun Dec 10, 2017 9:38 am
Forum: Hybridization
Topic: Composition of a Bond
Replies: 6
Views: 399

Re: Composition of a Bond

Thanks!
by Essly Mendoza 1J
Sat Dec 09, 2017 2:31 pm
Forum: Hybridization
Topic: Composition of a Bond
Replies: 6
Views: 399

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?
by Essly Mendoza 1J
Thu Dec 07, 2017 11:51 pm
Forum: Lewis Acids & Bases
Topic: 12.13
Replies: 5
Views: 319

Re: 12.13

The solutions manual states that Ag+ is a lewis acid, but can anyone explain why? Thank you!
by Essly Mendoza 1J
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: 267

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.
by Essly Mendoza 1J
Tue Dec 05, 2017 2:34 am
Forum: Conjugate Acids & Bases
Topic: Acids and Bases [ENDORSED]
Replies: 8
Views: 547

Re: Acids and Bases [ENDORSED]

I think we may be expected to know the most common strong acids and weak acids.
by Essly Mendoza 1J
Tue Dec 05, 2017 12:38 am
Forum: Conjugate Acids & Bases
Topic: Acids and Bases [ENDORSED]
Replies: 8
Views: 547

Re: Acids and Bases [ENDORSED]

Hello, how can we tell if the acid is a strong acid or a weak acid?
by Essly Mendoza 1J
Tue Dec 05, 2017 12:35 am
Forum: Conjugate Acids & Bases
Topic: Conjugate Acid and Base
Replies: 5
Views: 281

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.
by Essly Mendoza 1J
Sun Dec 03, 2017 4:56 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Dentates
Replies: 6
Views: 305

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?
by Essly Mendoza 1J
Tue Nov 21, 2017 4:58 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Difference Between Kp and Kc
Replies: 4
Views: 501

Re: Difference Between Kp and Kc

How are the equilibrium expression K and the equilibrium expression Kc different? Thank you.
by Essly Mendoza 1J
Fri Nov 17, 2017 10:02 am
Forum: Administrative Questions and Class Announcements
Topic: Midterm on myucla
Replies: 6
Views: 376

Re: Midterm on myucla

Do you guys know what the average on the midterm was? Thanks!
by Essly Mendoza 1J
Tue Nov 07, 2017 11:26 pm
Forum: Lewis Structures
Topic: Where to place lone pairs
Replies: 2
Views: 157

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.
by Essly Mendoza 1J
Sun Nov 05, 2017 11:53 pm
Forum: Lewis Structures
Topic: When to use a double bond or triple bond [ENDORSED]
Replies: 6
Views: 3685

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..
by Essly Mendoza 1J
Sun Oct 29, 2017 11:22 pm
Forum: Lewis Structures
Topic: Lewis Structure and Resonance
Replies: 1
Views: 81

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!
by Essly Mendoza 1J
Thu Oct 26, 2017 10:57 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: HW Question 2.43
Replies: 4
Views: 226

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!
by Essly Mendoza 1J
Mon Oct 16, 2017 10:46 pm
Forum: Properties of Light
Topic: Homework 1.33
Replies: 2
Views: 152

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...
by Essly Mendoza 1J
Thu Oct 12, 2017 10:53 pm
Forum: Properties of Light
Topic: 1.15
Replies: 4
Views: 207

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.
by Essly Mendoza 1J
Thu Oct 05, 2017 10:23 pm
Forum: Limiting Reactant Calculations
Topic: M3
Replies: 3
Views: 558

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...

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