Search found 40 matches

by Akemi Karamitsos 1E
Thu Feb 25, 2021 4:10 pm
Forum: Balancing Redox Reactions
Topic: sapling q.3
Replies: 2
Views: 15

Re: sapling q.3

You need to convert from acidic solution (H+) to basic solution (OH-) by adding enough OH- ions to both sides so that all H+ ions can combine with them to form water, which you will now have on both sides. Cancel the appropriate number so it only appears on one side.
by Akemi Karamitsos 1E
Thu Feb 25, 2021 4:04 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Writing Cell diagrams
Replies: 4
Views: 21

Re: Writing Cell diagrams

Quick question: does it matter what species comes first in writing the cell diagrams? I know that the cathode will be on the right of the double line and the anode reaction will be on the left of the double lines, but does it matter where we put each species? For instance: Are these essentially the...
by Akemi Karamitsos 1E
Thu Feb 25, 2021 4:00 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Salt Bridge
Replies: 30
Views: 71

Re: Salt Bridge

Does the salt bridge have anything to do with changing the mass of the electrodes of a voltaic cell? Or is change in mass only a result of the change from a solid to aqueous solution?
by Akemi Karamitsos 1E
Thu Feb 25, 2021 3:58 pm
Forum: Balancing Redox Reactions
Topic: Oxidizing Agent and Reducing Agent
Replies: 7
Views: 21

Re: Oxidizing Agent and Reducing Agent

I have another question to follow up on oxidizing and reducing agents. When determining these agents, do we use the single element or the entire compound that this element is a part of? Hopefully that makes sense??
by Akemi Karamitsos 1E
Thu Feb 25, 2021 3:55 pm
Forum: Balancing Redox Reactions
Topic: oxidation states
Replies: 2
Views: 13

Re: oxidation states

There are ordered rules that we use in order to assign an oxidation state to each element. Because the third rule states that "in their compounds, group-1 metals have an oxidation state of +1..." we would start by assigning K an oxidation state of +1. Rule 6 then states that oxygen atoms n...
by Akemi Karamitsos 1E
Sun Feb 21, 2021 3:35 pm
Forum: Balancing Redox Reactions
Topic: cell vs electrode vs half reaction
Replies: 6
Views: 24

Re: cell vs electrode vs half reaction

Funmi Baruwa wrote:so cells represent the reaction?


In a way, yes, since the cell is made up of the two electrodes, with the cathode representing reduction and the anode representing oxidation. Together, these half-cells carry out a redox reaction for the entire cell.
by Akemi Karamitsos 1E
Sun Feb 21, 2021 3:29 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Ecell vs Eocell
Replies: 7
Views: 142

Re: Ecell vs Eocell

Alex Benson wrote:Ecell is the cell potential, whereas Eocell is at the standard conditions.


To add on, these standard conditions are 1M solution or 1 atm at 25 degrees Celsius (298 K).
by Akemi Karamitsos 1E
Sun Feb 21, 2021 3:26 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Spontaneous Reduction
Replies: 9
Views: 22

Re: Spontaneous Reduction

All Lavelle mentioned in lecture regarding spontaneous reduction was that if your standard reduction potential value is positive, the reaction is spontaneous.
by Akemi Karamitsos 1E
Sun Feb 21, 2021 2:44 pm
Forum: Balancing Redox Reactions
Topic: Anode and Cathode
Replies: 11
Views: 28

Re: Anode and Cathode

In a galvanic cell, the anode side is oxidized because electrons flow towards the cathode, which is the reduced side.
by Akemi Karamitsos 1E
Sun Feb 21, 2021 2:41 pm
Forum: Balancing Redox Reactions
Topic: salt bridge
Replies: 19
Views: 58

Re: salt bridge

The salt bridge connects oxidation and reduction half-cells to maintain neutrality within the circuit. This neutrality is important for the reactions to carry out.
by Akemi Karamitsos 1E
Sat Feb 13, 2021 1:16 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Entropy
Replies: 27
Views: 83

Re: Entropy

In terms of Lavelle's exams, do we think the most important thing to know about entropy is a simple definition and how it relates to phase changes (solid, liquid, gas)?
by Akemi Karamitsos 1E
Sat Feb 13, 2021 1:14 pm
Forum: Van't Hoff Equation
Topic: Vant Hoff's equation
Replies: 7
Views: 43

Re: Vant Hoff's equation

The Van't Hoff Equation can be used to calculate K at different temperatures if delta H is known.
by Akemi Karamitsos 1E
Sat Feb 13, 2021 1:05 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Standard Gibbs Free Energy
Replies: 8
Views: 58

Re: Standard Gibbs Free Energy

Is it always true that if delta G is negative, the reaction is spontaneous? If so, please explain!
by Akemi Karamitsos 1E
Sat Feb 13, 2021 1:01 pm
Forum: Student Social/Study Group
Topic: Classes for next quarter?
Replies: 136
Views: 451

Re: Classes for next quarter?

Would it be a bad idea to take 14C and BL at the same time? Chem is definitely not my strongest subject. Any suggestions??
by Akemi Karamitsos 1E
Sat Feb 13, 2021 12:59 pm
Forum: Student Social/Study Group
Topic: Thoughts on Upcoming Midterm 2
Replies: 41
Views: 225

Re: Thoughts on Upcoming Midterm 2

Unfortunately, I didn't do very well on midterm 1, so the pressure is on for midterm 2. I mostly studied using the textbook homework problems and sapling. Does anyone who did well have a strategy or study method that worked best for them? Thanks!
by Akemi Karamitsos 1E
Fri Feb 05, 2021 1:15 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Closed Systems
Replies: 14
Views: 75

Re: Closed Systems

I don't believe Lavelle ever mentioned applying pressure when talking about closed systems. I think that all we need to know is that in a closed system, there is no matter exchanged with the surroundings, only energy.
by Akemi Karamitsos 1E
Fri Feb 05, 2021 1:07 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Temperature vs Enthalpy
Replies: 6
Views: 41

Re: Temperature vs Enthalpy

Heat is a transfer of energy due to a temperature difference. Enthalpy is the change in amount of heat in a system at constant pressure. You can only use heat and enthalpy interchangeably if there is no work being done to the system
by Akemi Karamitsos 1E
Fri Feb 05, 2021 1:03 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Examples for types of systems
Replies: 8
Views: 43

Re: Examples for types of systems

Open system: exchange of matter and energy (heat) with surroundings
Closed: no matter exchanged, only energy exchanged with surroundings
Isolated: no exchange of matter or energy with surroundings

I know these are definitions not examples, but it helps a lot with identifying systems!
by Akemi Karamitsos 1E
Tue Feb 02, 2021 2:18 pm
Forum: Calculating Work of Expansion
Topic: What is V1 and V2
Replies: 12
Views: 35

Re: What is V1 and V2

If we have an initial volume of zero, would using the formula, w=nRT*ln(V2/V1) ever work?
by Akemi Karamitsos 1E
Tue Feb 02, 2021 2:16 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Sapling Week 3/4 #18
Replies: 2
Views: 23

Re: Sapling Week 3/4 #18

Our constants and formulas sheet gives Cp=(5/2)R and Cv=(3/2)R. However for this question, the Cp=(7/2)R and Cv=(5/2)R. Does this mean the two are always related by subtracting 1R from Cp?
by Akemi Karamitsos 1E
Sun Jan 31, 2021 3:42 pm
Forum: Calculating Work of Expansion
Topic: Integral vs Infinite Sum [ENDORSED]
Replies: 3
Views: 39

Re: Integral vs Infinite Sum [ENDORSED]

Im pretty sure that Lavelle only included the infinite sum relation with work/pressure/delta volume to set up his explanation of the derivation of the integral equation. Since the integral is basically the sum with infinitely small segments, I don't quite see a situation where it would be better to...
by Akemi Karamitsos 1E
Sun Jan 31, 2021 3:39 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: isolated system
Replies: 16
Views: 263

Re: isolated system

Is there any way to change the energy of an isolated system?
by Akemi Karamitsos 1E
Sun Jan 31, 2021 3:35 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: perfect system
Replies: 20
Views: 80

Re: perfect system

In a perfect system, qsys+qsur=0 since qsys=-qsur. This means that the heat gained by the system is lost by the surroundings, or vice versa, explaining the opposite signs. The phenomena is explained by the First Law of Thermodynamics, which states that heat is neither lost nor destroyed, only transf...
by Akemi Karamitsos 1E
Sun Jan 31, 2021 3:32 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat Capacity vs. Specific Heat
Replies: 7
Views: 44

Re: Heat Capacity vs. Specific Heat

I understand that specific heat is more useful than heat capacity because it is an intensive property, but does this mean that we will probably never be using heat capacity in this class?
by Akemi Karamitsos 1E
Sun Jan 31, 2021 3:30 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Neutralization
Replies: 25
Views: 105

Re: Neutralization

Does this mean that the salt and the water are both neutral solutions (pH=7)?
by Akemi Karamitsos 1E
Sun Jan 24, 2021 10:36 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Difference between Strong and Weak acids and bases
Replies: 3
Views: 16

Re: Difference between Strong and Weak acids and bases

In what kind of problem would we need use this distinction in order to solve?
by Akemi Karamitsos 1E
Sun Jan 24, 2021 10:28 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat released/ gained
Replies: 22
Views: 195

Re: Heat released/ gained

Breaking a bond requires energy, so this reaction is endothermic. Forming a bond releases energy, so it is exothermic.
by Akemi Karamitsos 1E
Sun Jan 24, 2021 10:27 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: calorimetry
Replies: 9
Views: 171

Re: calorimetry

Do different calorimeters each have their own specific heat capacities?
by Akemi Karamitsos 1E
Sun Jan 24, 2021 10:18 am
Forum: Phase Changes & Related Calculations
Topic: No Heat Change
Replies: 15
Views: 67

Re: No Heat Change

So to clarify, heat is not synonymous with temperature in this case? Heat is increasing but temperature is not?
by Akemi Karamitsos 1E
Sun Jan 24, 2021 10:14 am
Forum: Phase Changes & Related Calculations
Topic: Endothermic v. Exothermic
Replies: 107
Views: 340

Re: Endothermic v. Exothermic

Delta H represents the change in enthalpy, which is the total heat content of a system. So yes, the positive or negative sign of delta H should be used to determine whether a reaction is endothermic or exothermic. When it is less than zero, this means that heat has been released from the system, ind...
by Akemi Karamitsos 1E
Sun Jan 17, 2021 12:30 pm
Forum: General Science Questions
Topic: Conjugate Acids and Bases
Replies: 4
Views: 27

Re: Conjugate Acids and Bases

How would we determine if something is neutral given its conjugate? I'm pretty sure it has something to do with salts, but I'm still confused.
by Akemi Karamitsos 1E
Sun Jan 17, 2021 12:18 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Difference between ionization and protonation
Replies: 5
Views: 28

Re: Difference between ionization and protonation

In the Week 2 sapling assignment, #5 asks us to find the % protonation. I got it wrong at first because I just used the initial concentration of B as the denominator, but the solution tells us to use the formal concentration, which is the sum of the concentrations of B and BH+. Can anyone explain wh...
by Akemi Karamitsos 1E
Fri Jan 15, 2021 8:17 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: When x is negligible in Equilibrium constant
Replies: 34
Views: 160

Re: When x is negligible in Equilibrium constant

If we determine that K is less than 10^-3 or, to be safe, less than 10^-4, but get an x greater than 5%, does that mean that we had a mathematical error when calculating our K? Or are we simply unable to use approximation for that particular problem?
by Akemi Karamitsos 1E
Wed Jan 13, 2021 10:26 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Chem Equilibria
Replies: 6
Views: 45

Re: Chem Equilibria

Hi, I know this is probably a pretty simple answer, but could someone reiterate how Q is different than K? I'm still a bit confused.
by Akemi Karamitsos 1E
Tue Jan 12, 2021 10:15 am
Forum: Administrative Questions and Class Announcements
Topic: Chemistry Posts in 14B
Replies: 156
Views: 2404

Re: Chemistry Posts in 14B

Were the Audio-Visual Focus-Topics a one time thing? Or will we have new ones each week? Thanks!
by Akemi Karamitsos 1E
Fri Jan 08, 2021 10:31 am
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 187
Views: 109115

Re: Reading the textbook [ENDORSED]

Does anyone who has taken Lavelle's class in the past recommend reading the textbook consistently? Do the types of questions in the book appear on the midterms or final? Thank you!
by Akemi Karamitsos 1E
Fri Jan 08, 2021 10:27 am
Forum: Administrative Questions and Class Announcements
Topic: Registering/Creating Your Chemistry Community Account
Replies: 32
Views: 45081

Re: Registering/Creating Your Chemistry Community Account

MackenziePerillo-1L wrote:Does it matter what our alias is?


They recommended using our name and discussion section :) I'm assuming that makes it easier for them to give us points?
by Akemi Karamitsos 1E
Fri Jan 08, 2021 10:23 am
Forum: Administrative Questions and Class Announcements
Topic: Sapling Assignments
Replies: 28
Views: 164

Re: Sapling Assignments

Are the questions that say they are due the Sunday of Week 2 the only graded homework for this course? Is everything else provided just optional/recommended/extra practice?
by Akemi Karamitsos 1E
Fri Jan 08, 2021 10:20 am
Forum: Administrative Questions and Class Announcements
Topic: Accessing the E-textbook [ENDORSED]
Replies: 107
Views: 7373

Re: Accessing the E-textbook [ENDORSED]

I purchased the sapling+ 7th edition ebook a few days ago from ucla and have not received a notification for the prepaid code to access sapling. Does anybody have a solution or are in a similar situation? Thanks. Hi, I had the exact same problem, because I did not previously take 14A with Lavelle. ...
by Akemi Karamitsos 1E
Fri Jan 08, 2021 10:12 am
Forum: Administrative Questions and Class Announcements
Topic: Chemistry Posts in 14B
Replies: 156
Views: 2404

Re: Chemistry Posts in 14B

What is the last day in the week to get in our 5 posts? Is there a set "due date"?

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