Search found 60 matches

by LG2019
Fri Mar 15, 2019 12:04 am
Forum: General Rate Laws
Topic: Final Equations
Replies: 4
Views: 40

Re: Final Equations

I also don't see ln(k2/k1) = Ea/R (1/T1 - 1/T2) on any of the equations sheets he's given us but I feel like it would be provided. I'm not sure though. Hope this helps!
by LG2019
Fri Mar 15, 2019 12:00 am
Forum: General Rate Laws
Topic: Final Equations
Replies: 4
Views: 40

Re: Final Equations

The only one I can think of is K = k/k'
equilibrium constant = rate constant of forward reaction / rate constant of reverse reaction
by LG2019
Thu Mar 14, 2019 11:53 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Effect of temp. on rate constants
Replies: 3
Views: 55

Re: Effect of temp. on rate constants

This is really helpful, thanks!
by LG2019
Thu Mar 14, 2019 5:45 pm
Forum: General Rate Laws
Topic: rate laws
Replies: 6
Views: 59

Re: rate laws

Ok cool thanks!
by LG2019
Thu Mar 14, 2019 3:31 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: intermediates vs. catalysts
Replies: 2
Views: 23

Re: intermediates vs. catalysts

Great, thanks!
by LG2019
Thu Mar 14, 2019 2:12 pm
Forum: *Enzyme Kinetics
Topic: Catalysts
Replies: 7
Views: 75

Re: Catalysts

Thank you!
by LG2019
Thu Mar 14, 2019 2:12 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: intermediates vs. catalysts
Replies: 2
Views: 23

intermediates vs. catalysts

Just to clarify, if a compound is produced in one step and consumed in another step later on, it is an intermediate, and if a compound is consumed in one step and produced again in another step later on, it is a catalyst?
by LG2019
Thu Mar 14, 2019 2:10 pm
Forum: General Rate Laws
Topic: rate laws
Replies: 6
Views: 59

rate laws

Do rate laws depend on the stoichiometric coefficients of the reactants in the balanced chemical equation?
by LG2019
Thu Mar 14, 2019 2:08 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Effect of temp. on rate constants
Replies: 3
Views: 55

Effect of temp. on rate constants

Why does raising the temperature of a reaction increase the rate constant of the reaction with the higher activation barrier more than it will the rate constant of of the reaction with the lower energy barrier?
by LG2019
Thu Mar 14, 2019 2:05 pm
Forum: *Enzyme Kinetics
Topic: Catalysts
Replies: 7
Views: 75

Catalysts

Does a catalyst increase the rate of the reverse reaction too or just the forward reaction?
by LG2019
Thu Mar 14, 2019 12:56 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: cell diagrams
Replies: 6
Views: 56

Re: cell diagrams

Ok thank you all!
by LG2019
Thu Mar 14, 2019 12:44 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: cell diagrams
Replies: 6
Views: 56

Re: cell diagrams

So all liquids aren't included in the cell diagram or just H2O?
by LG2019
Wed Mar 13, 2019 11:28 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: cell diagrams
Replies: 6
Views: 56

cell diagrams

What is the order for the cell diagrams including liquids?
by LG2019
Wed Mar 13, 2019 11:27 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: activated complexes [ENDORSED]
Replies: 2
Views: 44

activated complexes [ENDORSED]

do we need to know how to draw proposed structures for activated complexes (like in 6E 15.85)?
by LG2019
Wed Mar 13, 2019 11:24 pm
Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
Topic: Metal dissolution
Replies: 2
Views: 32

Metal dissolution

Based on electrochemical properties, how can we tell if a metal will dissolve in solution?
by LG2019
Fri Mar 08, 2019 6:52 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: electrolysis
Replies: 4
Views: 68

Re: electrolysis

How is an electrolytic cell different from a galvanic cell?
by LG2019
Fri Mar 08, 2019 6:42 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: electrolysis
Replies: 4
Views: 68

electrolysis

I'm having trouble understanding what electrolysis is. Can someone please explain the significance of this process?
by LG2019
Wed Feb 13, 2019 4:33 pm
Forum: Calculating Work of Expansion
Topic: Reversible expansion
Replies: 4
Views: 59

Re: Reversible expansion

Ok thank you!
by LG2019
Wed Feb 13, 2019 4:32 pm
Forum: Calculating Work of Expansion
Topic: Expansion work
Replies: 2
Views: 43

Re: Expansion work

Thank you!
by LG2019
Wed Feb 13, 2019 4:30 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Delta n
Replies: 7
Views: 125

Re: Delta n

Ok thanks!
by LG2019
Wed Feb 13, 2019 4:27 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Delta n
Replies: 7
Views: 125

Delta n

I know that P x delta V = delta n x R x T but how do you calculate delta n?
by LG2019
Wed Feb 13, 2019 4:24 pm
Forum: Calculating Work of Expansion
Topic: Reversible expansion
Replies: 4
Views: 59

Reversible expansion

What is reversible expansion and how does it differ from irreversible expansion?
by LG2019
Wed Feb 13, 2019 4:22 pm
Forum: Calculating Work of Expansion
Topic: Expansion work
Replies: 2
Views: 43

Expansion work

What is the definition of expansion work?
by LG2019
Thu Feb 07, 2019 12:39 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: HW problem 4B. 13
Replies: 5
Views: 107

Re: HW problem 4B. 13

I am plugging the values into the w = -nRTln(V2/V1) equation but am not getting the right answer. Are my values correct?
n = (1.79atm)(6.52L)/(8.3145)(305K) = 0.00460 mol
w = -(.00460)(8.3145)(305)ln(6.52/4.29) = -488J
The answer in the book is -326J
by LG2019
Sat Dec 08, 2018 12:26 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: 7th edition 6C.19
Replies: 2
Views: 67

Re: 7th edition 6C.19

Thank you!
by LG2019
Thu Dec 06, 2018 11:00 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 7th edition 6B.9
Replies: 2
Views: 59

Re: 7th edition 6B.9

Ok thank you!
by LG2019
Thu Dec 06, 2018 9:07 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: 7th edition 6C.19
Replies: 2
Views: 67

7th edition 6C.19

For part (c) of 6C.19 why is HClO2 a stronger acid than HBrO2 if bromine has a larger atomic radius and is thus less electronegative?
by LG2019
Thu Dec 06, 2018 8:53 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Strength of an acid/base
Replies: 2
Views: 67

Re: Strength of an acid/base

But to calculate pKa and pKb we need acidity and basicity constants. Will we be given those on the test?
by LG2019
Thu Dec 06, 2018 5:20 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 7th edition 6B.9
Replies: 2
Views: 59

7th edition 6B.9

part (i) of problem 6B.7 from the 7th edition asks to find [OH-], pH, and pOH from [H30+]=1.50M. When you calculate the pH from [H3O+] you get -log[1.50] which is -0.176 The answer in the back of the book is 0.176 (no negative) so do you just have to change it to positive when you calculate a pH to ...
by LG2019
Wed Nov 28, 2018 12:22 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: 2D.3
Replies: 2
Views: 68

Re: 2D.3

Thank you!
by LG2019
Sun Nov 25, 2018 11:57 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 3
Replies: 38
Views: 597

Re: Test 3

Will test 3 cover material covered in lecture on Monday (11/26)?
by LG2019
Sun Nov 25, 2018 11:54 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sigma and Pi Bonds
Replies: 3
Views: 55

Re: Sigma and Pi Bonds

Sigma bonds allow atoms to rotate freely, unlike pi bonds.
by LG2019
Sun Nov 25, 2018 11:52 pm
Forum: Bond Lengths & Energies
Topic: Dissociation Energy
Replies: 4
Views: 102

Re: Dissociation Energy

Does this apply to electronegativity values as well? Do we need to know exact values for the test or just trends?
by LG2019
Sun Nov 25, 2018 11:47 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Ionic Character
Replies: 3
Views: 62

Ionic Character

A few of the homework questions gave you two compounds and asked you to determine which compound had bonds with greater ionic character. I just kind of estimated the electronegativity differences of the compounds using the periodic table, but I'm wondering if there's a better way to go about answeri...
by LG2019
Sun Nov 25, 2018 11:42 pm
Forum: Dipole Moments
Topic: dipole
Replies: 6
Views: 151

Re: dipole

Do we need to know how to draw dipoles for the test?
by LG2019
Sun Nov 25, 2018 11:40 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: 2D.3
Replies: 2
Views: 68

2D.3

For question 2D.3 from the 7th edition, do you need to know the electronegativity values of the elements and calculate the differences in electronegativity in order to determine which compounds are primarily ionic?
by LG2019
Fri Nov 09, 2018 9:25 pm
Forum: Dipole Moments
Topic: Interaction Potential Energy
Replies: 4
Views: 76

Re: Interaction Potential Energy

Why is interaction potential energy always negative?
by LG2019
Fri Nov 09, 2018 9:24 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 8
Views: 134

Re: Electronegativity

How do you predict an atom's electronegativity? Is it a periodic trend?
by LG2019
Fri Nov 09, 2018 9:19 pm
Forum: Dipole Moments
Topic: Dipole
Replies: 8
Views: 145

Re: Dipole

What exactly does the term "dipole" mean?
by LG2019
Fri Nov 02, 2018 11:57 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Valence shells
Replies: 1
Views: 94

Valence shells

When there are electrons in the 4s or 4p orbitals, is the 3d sub shell not considered part of the valence shell?
by LG2019
Fri Nov 02, 2018 11:53 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Node
Replies: 2
Views: 100

Node

I'm having trouble understanding what a node is in relation to a wavefunction. Can someone explain this concept to me?
by LG2019
Fri Nov 02, 2018 11:51 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Problem 1B.27
Replies: 1
Views: 64

Problem 1B.27

In this problem from the seventh edition from the textbook, is the uncertainty in velocity 5 or 10, and why?
by LG2019
Fri Nov 02, 2018 11:47 pm
Forum: *Shrodinger Equation
Topic: Midterm
Replies: 6
Views: 195

Re: Midterm

The midterm only covers up to Wednesday's material, right?
by LG2019
Fri Nov 02, 2018 11:46 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Nodal planes
Replies: 6
Views: 136

Re: Nodal planes

Why is the number of nodal planes equal to the value of l?
by LG2019
Fri Nov 02, 2018 11:41 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Shells, Subshells, Orbitals
Replies: 2
Views: 148

Shells, Subshells, Orbitals

I'm having trouble conceptually understanding the difference between shells, subshells, and orbitals. Can someone help me?
by LG2019
Fri Oct 19, 2018 11:27 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Test Two: Electron Configuration
Replies: 6
Views: 111

Re: Test Two: Electron Configuration

I believe Professor Lavelle said that everything up to, and including, today's lecture material will be on test two.
by LG2019
Fri Oct 19, 2018 11:23 pm
Forum: Photoelectric Effect
Topic: Significance of the photoelectric effect
Replies: 3
Views: 195

Re: Significance of the photoelectric effect

The photoelectric effect is significant because it demonstrates that light has particle-like qualities. It established that we can consider light as photons (packets) of energy where one photon interacts w/ one electron and each photon must have sufficient energy to remove each electron. This is why...
by LG2019
Fri Oct 19, 2018 11:12 pm
Forum: SI Units, Unit Conversions
Topic: Remembering Unit Conversions
Replies: 5
Views: 260

Re: Remembering Unit Conversions

This is really helpful, thanks! :)
by LG2019
Fri Oct 12, 2018 11:56 pm
Forum: Properties of Electrons
Topic: Free vs. Bound Electrons
Replies: 6
Views: 111

Re: Free vs. Bound Electrons

A free electron is one that is not bound to an atom, whereas a bound electron is one that is bound to the nucleus of atom. An important distinction is that free electrons are not apart of the quantum system, whereas bound electrons are.
by LG2019
Fri Oct 12, 2018 11:52 pm
Forum: DeBroglie Equation
Topic: explain debroglie equation?
Replies: 3
Views: 63

Re: explain debroglie equation?

The debroglie equation is used to describe the wavelike nature of an electron. The equation is: wavelength = /mv
The equation can also be applied to larger objects like cars to see if they have measurable wavelike properties.
by LG2019
Fri Oct 12, 2018 11:44 pm
Forum: Properties of Electrons
Topic: Wave Particles Duality of Matter
Replies: 4
Views: 42

Re: Wave Particles Duality of Matter

So then what exactly are diffraction patterns and how do constructive and destructive interference affect them?
by LG2019
Fri Oct 05, 2018 11:22 pm
Forum: SI Units, Unit Conversions
Topic: formula units [ENDORSED]
Replies: 68
Views: 21405

Re: formula units [ENDORSED]

So is the term 'formula units' only relevant when talking about compounds?
by LG2019
Fri Oct 05, 2018 11:21 pm
Forum: SI Units, Unit Conversions
Topic: How does grading for discussion posts work?
Replies: 73
Views: 1836

Re: How does grading for discussion posts work?

Are our posts due by Friday or Sunday, typically?
by LG2019
Fri Oct 05, 2018 11:13 pm
Forum: Limiting Reactant Calculations
Topic: Limiting reagents
Replies: 12
Views: 155

Re: Limiting reagents

There cannot be more than one limiting reactant. There is no limiting reactant if both substances are completely used up.

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