Search found 53 matches

by 805383532
Sun Mar 15, 2020 1:57 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 280
Views: 134560

Re: Saying Thank You to Dr. Lavelle

He was dope! A very funny dude and he made class fun :^)
by 805383532
Sun Mar 15, 2020 1:56 pm
Forum: Administrative Questions and Class Announcements
Topic: Chem Final Typo
Replies: 8
Views: 289

Re: Chem Final Typo

I was wondering this too!! I didn’t know if I should email him or not :/
by 805383532
Sun Mar 15, 2020 1:55 pm
Forum: Van't Hoff Equation
Topic: Chemistry analysis
Replies: 1
Views: 74

Re: Chemistry analysis

I was confused about this too, but I don’t think there’s any difference between chemistry van’t hoff and van’t hoff.
by 805383532
Sun Mar 15, 2020 1:51 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8019
Views: 1404042

Re: Post All Chemistry Jokes Here

Atoms are hard to trust. I heard they make up everything...
by 805383532
Sun Mar 15, 2020 1:49 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8019
Views: 1404042

Re: Post All Chemistry Jokes Here

Someone threw sodium chloride at me. I’m still salty.
by 805383532
Sun Mar 15, 2020 1:48 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8019
Views: 1404042

Re: Post All Chemistry Jokes Here

I would tell you a joke about chemistry, but they Argon.
by 805383532
Sun Mar 15, 2020 1:46 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 127
Views: 33502

Re: Final Jitters

I hope all of this advice helped! :)
by 805383532
Sun Mar 15, 2020 1:45 pm
Forum: Administrative Questions and Class Announcements
Topic: Athena
Replies: 34
Views: 1969

Re: Athena

Thanks for being such a cool professor! I wish you the best!
by 805383532
Sun Mar 08, 2020 8:32 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8019
Views: 1404042

Re: Post All Chemistry Jokes Here

If Silver Surfer and Iron Man teamed up, they’d be alloys.
by 805383532
Sun Mar 08, 2020 8:26 pm
Forum: Balancing Redox Reactions
Topic: e- amount
Replies: 9
Views: 74

e- amount

If the number of e- don’t match on both sides of the reaction, then did I balance the redox reaction incorrectly? Do they have to be the same for the reactant and product/cancel out?
by 805383532
Sun Mar 08, 2020 8:23 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Vertical lines vs commas
Replies: 7
Views: 32

Re: Vertical lines vs commas

Use vertical lines between different phases (i.e. s|g|l|aq) and double vertical lines between anode and cathode (anode||cathode). Use commas between molecules of the same phase ( i.e Pt(s), C(s) )
by 805383532
Sun Mar 08, 2020 8:21 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Figuring out n
Replies: 15
Views: 186

Re: Figuring out n

In this equation, n is equal to the number of electrons being transferred, so you would first have to balance the half reactions.
by 805383532
Sun Mar 08, 2020 8:16 pm
Forum: Van't Hoff Equation
Topic: Van't Hoff Equation
Replies: 6
Views: 101

Re: Van't Hoff Equation

There are many ways to manipulate the equation, as you can manipulate the variables solve for dH, K2, K1, T2, and T1. The main use for the equation is to relate the change in K to the change in temperature.
by 805383532
Sun Mar 08, 2020 8:10 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: calculating Q
Replies: 12
Views: 100

calculating Q

When finding Q in the nernst equation, is it always [cathode]/[anode] or is it [anode]/[cathode] ?
by 805383532
Sun Mar 01, 2020 5:09 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Salt Bridge
Replies: 3
Views: 45

Salt Bridge

If there isn't a salt bridge, then how are the charges maintained/balanced?
by 805383532
Sun Mar 01, 2020 4:58 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Galvanic vs Electrolytic Cell
Replies: 1
Views: 31

Galvanic vs Electrolytic Cell

I know the difference between the two cells is because of the charge of the anode/cathode, but how do you know whether the anode/cathode is positive or negative?
by 805383532
Sun Mar 01, 2020 4:55 pm
Forum: Balancing Redox Reactions
Topic: Anode and Cathode
Replies: 9
Views: 92

Anode and Cathode

How can you tell which solution is the anode and which solution is the cathode? How do you know which way the electrons are flowing?
by 805383532
Sun Mar 01, 2020 4:50 pm
Forum: Balancing Redox Reactions
Topic: H+ or H2O
Replies: 4
Views: 45

H+ or H2O

How do you know when you need H+ or H2O? How do you know you need to balance O or H?
by 805383532
Sun Feb 23, 2020 11:24 pm
Forum: Van't Hoff Equation
Topic: Van’t Hoff Equation
Replies: 11
Views: 200

Van’t Hoff Equation

What does the equation measure? How does it relate to gibbs free energy?
by 805383532
Sun Feb 23, 2020 11:15 pm
Forum: Balancing Redox Reactions
Topic: Test 2 Topics
Replies: 7
Views: 65

Test 2 Topics

Will test 2 include all topics learned during week 8 also?
by 805383532
Sun Feb 23, 2020 11:12 pm
Forum: Administrative Questions and Class Announcements
Topic: Sapling Learning
Replies: 6
Views: 87

Re: Sapling Learning

They’re helpful if you want extra practice problems, but some of it is pretty simple. It’s helpful to learn the basics of a topic.
by 805383532
Sun Feb 23, 2020 11:07 pm
Forum: Balancing Redox Reactions
Topic: Reduced/Oxidized
Replies: 5
Views: 51

Reduced/Oxidized

If you’re not given the charge, how would you know which elements/molecules are reduced or oxidized?
by 805383532
Sun Feb 23, 2020 11:01 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: applying gibbs free energy
Replies: 5
Views: 65

Re: applying gibbs free energy

Gibbs free energy tells us about the spontaneity of a reaction. If it is less than 0, then the process is exergonic and will proceed spontaneously in the forward direction. If it is greater than 0, then the process is endergonic and will proceed spontaneously in the reverse direction. If it is equal...
by 805383532
Sun Feb 16, 2020 8:21 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: S = 0
Replies: 18
Views: 264

Re: S = 0

Entropy is 0 in an isothermal reversible system.
by 805383532
Sun Feb 16, 2020 8:14 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Spontaneous
Replies: 13
Views: 121

Re: Spontaneous

A reaction is spontaneous when delta G is less than 0.
by 805383532
Sun Feb 16, 2020 8:11 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Delta s = 0
Replies: 8
Views: 162

Re: Delta s = 0

delta S is equal to 0 in an isothermal reversible system.
by 805383532
Sun Feb 16, 2020 8:07 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Delta U
Replies: 8
Views: 121

Re: Delta U

Delta U is the change in internal energy. Internal energy is the energy contained within a system.
by 805383532
Sun Feb 09, 2020 7:11 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Reversible vs Irreversible
Replies: 7
Views: 139

Re: Reversible vs Irreversible

When a system is reversible, dStotal = dSsystem + dSsurroundings is equal to 0.
by 805383532
Sun Feb 09, 2020 6:58 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: state function mnemonic device
Replies: 3
Views: 61

Re: state function mnemonic device

PDTVHUGS, Pressure(P) Density(D) Temperature(T) Volume(V) Enthalpy(H) InternalEnergy(U) GibbsFreeEnergy(G) Entropy(S)

I think Lyndon's went something like this:
If you're under Pressure and Depressed, just watch some TV and get lots of HUGS.
by 805383532
Sun Feb 09, 2020 6:54 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Law of Conservation Energy
Replies: 5
Views: 33

Re: Law of Conservation Energy

Yes, energy is neither created nor destroyed, but it can be transformed or transferred. It is conserved over time.
by 805383532
Sun Feb 09, 2020 6:50 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: First Law of Themordynamics
Replies: 4
Views: 51

Re: First Law of Themordynamics

The First Law of thermodynamics is a "version" of the Law of Conservation of Energy. They're the same thing, but the First Law is adapted for thermodynamic processes.
by 805383532
Sun Feb 09, 2020 6:45 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Delta U
Replies: 7
Views: 81

Re: Delta U

delta U is equal to 0 when temperature is constant. If delta U is 0, and deltaU=q+w, then 0=q+w and when you solve for q then the equation becomes q= -w
by 805383532
Sun Feb 09, 2020 6:43 pm
Forum: Calculating Work of Expansion
Topic: Isobaric and Isochoric
Replies: 5
Views: 86

Re: Isobaric and Isochoric

Just remember "iso" means same (equal measurements), "baric" is for pressure, and "choric" is for volume.
by 805383532
Sun Feb 02, 2020 8:21 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated vs Closed [ENDORSED]
Replies: 34
Views: 723

Re: Isolated vs Closed [ENDORSED]

Open systems allow everything (matter and heat) to go in and out. Closed systems only allow heat to go in and out. Isolated systems don't allow either in or out.
by 805383532
Sun Feb 02, 2020 8:18 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Test 1
Replies: 6
Views: 84

Test 1

How do you know which direction the reaction will go based off of K and Q values?
by 805383532
Sun Feb 02, 2020 8:16 pm
Forum: Student Social/Study Group
Topic: Midterm study
Replies: 8
Views: 132

Midterm study

I didn't have Lavelle last quarter for 14A, so I'm not sure how the review sessions are and the amount is overwhelming. Which workshops/drop-ins/review sessions would you suggest? Thank you.
by 805383532
Sun Feb 02, 2020 8:12 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Purpose
Replies: 2
Views: 34

Purpose

What is the purpose of a calorimeter, and how accurate is it?
by 805383532
Sun Feb 02, 2020 8:05 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: U and H
Replies: 2
Views: 57

U and H

How do I know when to use the (U = q - w) equation and when to use the (H = U + PV)?
by 805383532
Sun Jan 26, 2020 3:42 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Method 3
Replies: 2
Views: 32

Method 3

How do you make sure that the reaction is in standard state?
by 805383532
Sun Jan 26, 2020 3:35 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE
Replies: 20
Views: 173

Re: ICE

You use the ICE table when trying to find a missing concentration. Ka and the initial concentration of the reactant are usually given.
by 805383532
Sun Jan 26, 2020 3:23 pm
Forum: Phase Changes & Related Calculations
Topic: Standard State
Replies: 2
Views: 59

Standard State

Is the standard state the same for all elements?
by 805383532
Sun Jan 26, 2020 3:21 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy w/ Temp
Replies: 6
Views: 63

Enthalpy w/ Temp

How does a change in temperature affect enthalpy?
by 805383532
Sun Jan 26, 2020 3:20 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy & Spontaneity
Replies: 4
Views: 47

Enthalpy & Spontaneity

How is enthalpy related to the spontaneity of a reaction?
by 805383532
Sun Jan 19, 2020 11:33 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Change in Temperature
Replies: 2
Views: 27

Change in Temperature

What happens to equilibrium if the temperature goes higher or lower than 25C?
by 805383532
Sun Jan 19, 2020 11:24 am
Forum: Ideal Gases
Topic: R Constant
Replies: 7
Views: 52

R Constant

How do we know which R constant to use in calculation?
by 805383532
Sun Jan 19, 2020 11:21 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Solids and Liquids
Replies: 6
Views: 56

Solids and Liquids

Why are solids and liquids disregarded when calculating K and Q?
by 805383532
Sun Jan 19, 2020 11:20 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Box
Replies: 4
Views: 30

ICE Box

Why is the H2O ignored when creating the ICE box?
by 805383532
Sun Jan 19, 2020 11:14 am
Forum: Ideal Gases
Topic: Topics on Test 1
Replies: 37
Views: 417

Re: Topics on Test 1

Test 1 covers all of chemical equilibrium and acids and bases.
by 805383532
Sun Jan 19, 2020 11:09 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Titration
Replies: 1
Views: 25

Titration

How does titration affect equilibrium?
by 805383532
Sun Jan 19, 2020 11:02 am
Forum: Ideal Gases
Topic: PV=nRT
Replies: 13
Views: 141

Re: PV=nRT

It could possibly be used to find the partial pressure of a molecule if you are looking for Kp.
by 805383532
Sun Jan 19, 2020 10:53 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K vs Kc
Replies: 3
Views: 27

Re: K vs Kc

Both are equilibrium constants. K is the general constant while Kc is the constant denoted when calculating with concentrations, just like how Kp is used when calculating with pressures.
by 805383532
Sun Jan 19, 2020 10:50 am
Forum: Identifying Acidic & Basic Salts
Topic: Identifying salts
Replies: 2
Views: 82

Identifying salts

How can I identify a salt in a reaction?
by 805383532
Sun Jan 19, 2020 10:48 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Strength of Acids and Bases
Replies: 1
Views: 75

Strength of Acids and Bases

How do you know the strength of an acid or a base just by looking at what molecules/atoms it's made of?

Go to advanced search