Search found 49 matches

by JosephineF
Sat Mar 14, 2020 6:56 pm
Forum: *Nucleophiles
Topic: FInal
Replies: 6
Views: 199

Re: FInal

If you are able to do the in text problems then you should be good. He often wouldn't cover certain topics that we ended up needing to know in lecture but everything you need to know is in the text book.
by JosephineF
Sat Mar 14, 2020 6:54 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 127
Views: 33472

Re: Final Jitters

Treat it like the SAT. Every question is weighted roughly the same so do a once over where you answer everything you know off the top of your head. Then go back over and spend some time with the ones you skipped. Then go over it one last time to check that you did them all correctly and didn't make ...
by JosephineF
Sat Mar 14, 2020 6:08 pm
Forum: General Science Questions
Topic: Who makes the Final
Replies: 23
Views: 372

Re: Who makes the Final

Jose Robles 1D wrote:Wait is the whole test going to be on CCLE now right?

I believe so yes
by JosephineF
Sat Mar 14, 2020 6:01 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: determining a catalyst
Replies: 5
Views: 43

Re: determining a catalyst

The catalyst is not created by the reaction but is also not present in the final balance equation because it gets canceled out. An intermediate is essentially the same except it is created by the reaction and is then used up and canceled out by the next mechanism. So it too is not in the final balan...
by JosephineF
Sat Mar 14, 2020 5:58 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: A- frequency factor
Replies: 3
Views: 59

A- frequency factor

What are the units for A? Also is it a numerical value? All I really know is that it relates to the frequency and orientation of collisions
by JosephineF
Sat Mar 14, 2020 5:57 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: arrhenius equation
Replies: 4
Views: 33

Re: arrhenius equation

A is the frequency factor so it includes the frequency and orientation of collisions
by JosephineF
Sat Mar 14, 2020 5:54 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalysts on Final
Replies: 6
Views: 113

Re: Catalysts on Final

probably when given some sort of mechanism you would need to be able to tell the difference between a catalyst and an intermediate. So the catalyst is not created but the intermediate is created and then is then used.
by JosephineF
Sat Mar 14, 2020 5:53 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius equation
Replies: 2
Views: 28

Arrhenius equation

I've seen a version of the Arrhenius equation that looks like: . I'm guessing it's used for finding one temp or the other but wouldn't that mean you would have to be given both ks?
by JosephineF
Sat Mar 14, 2020 4:01 pm
Forum: General Rate Laws
Topic: integrals and derivatives
Replies: 7
Views: 110

integrals and derivatives

Will have to actually do integrals and derivatives or was that just used as showing us conceptual why the equation works?
by JosephineF
Sat Mar 14, 2020 3:58 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8013
Views: 1401564

Re: Post All Chemistry Jokes Here

How everyone is about to be with spring quarter online classes
by JosephineF
Sat Mar 14, 2020 8:21 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8013
Views: 1401564

Re: Post All Chemistry Jokes Here

we're all gonna be this cool after we finish this final
by JosephineF
Fri Mar 13, 2020 5:32 pm
Forum: Student Social/Study Group
Topic: Tips for Staying Focused
Replies: 8
Views: 204

Re: Tips for Staying Focused

I've been putting my phone on do not disturb and setting a timer for an hour at a time and so for that I hour I sit and study and then when the timer goes off I give myself a 10 minute break and then I restart the timer for another hour. You just have to get into a groove. The hardest part is starti...
by JosephineF
Thu Mar 12, 2020 12:03 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: translational and rotational contribution from molecular motion
Replies: 3
Views: 72

translational and rotational contribution from molecular motion

Will translational and rotational contribution from molecular motion be on the final? I don't ever remember covering it in class but it is in some of the 4C homework problems
by JosephineF
Thu Mar 12, 2020 11:20 am
Forum: Administrative Questions and Class Announcements
Topic: Take Home Final
Replies: 16
Views: 271

Re: Take Home Final

I think he said he is going to send a more detailed email about logistics later this week
by JosephineF
Thu Mar 12, 2020 8:20 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Lavelle's review slides
Replies: 3
Views: 46

Lavelle's review slides

On the last slide of Lavelle's review it asks to choose which students' mechanism is valid based on the observed rate law. I'm not sure where the K1,k1, and k2 are coming from and how they are used to determine the rate limiting step. If someone doesn't mind walking me through that whole problem, it...
by JosephineF
Thu Mar 12, 2020 7:57 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Lavelle's review slides
Replies: 3
Views: 39

Lavelle's review slides

In Lavelle's review slides there is a problem asking what the problem is with the cell diagram and the correction is the addition of Pt(s) to the right side. Is this because the right side only had Br(aq) and Br(g) and there needs to be a solid conductor in a galvanic cell?
by JosephineF
Thu Mar 12, 2020 7:51 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Lavelle's review slides
Replies: 1
Views: 40

Lavelle's review slides

In Lavelle's review there is a problem talking about calculating the Gibbs free energy under non equilibrium condition and in the end \Delta G is positive. The slide says that because it is positive the reaction is spontaneous. I thought in order for a reaction to be spontaneous \Delta G had to be n...
by JosephineF
Wed Mar 11, 2020 2:54 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: text problem 4A.9
Replies: 2
Views: 82

text problem 4A.9

What equation is the solution manual using to solve what the final temp of 50.7 g of water at 22C is after adding 20g of copper at 100C? assuming no energy is lost to surroundings
by JosephineF
Wed Mar 11, 2020 1:59 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: test problem 4A.5 continued
Replies: 3
Views: 86

test problem 4A.5 continued

Why does this problem use for an irreversible expansion but w=-nRTln(V2/V1) for a reversible expansion?
by JosephineF
Wed Mar 11, 2020 1:54 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: text problem 4A.5
Replies: 3
Views: 80

text problem 4A.5

A piston confines 0.200 mol Ne(g) in 1.20L as 25C. The gas is allowed to expand through an additional 1.20 L against a constant pressure of 1.00 atm



How do we know that the expansion of the piston is irreversible expansion?
by JosephineF
Tue Mar 10, 2020 1:55 pm
Forum: Administrative Questions and Class Announcements
Topic: 14B acids and bases section
Replies: 2
Views: 42

14B acids and bases section

Should we use the 14A section on Acids and Bases for our questions? I am confused about Q3D of the midterm where it asks: at pH 6, what is the net charge of acetic acid, pKa= 4.75? At the review the TA said that you can tell that it will be a -1 charge because the pKa is smaller than the pH. I am co...
by JosephineF
Sun Mar 08, 2020 5:17 pm
Forum: General Rate Laws
Topic: derivations?
Replies: 5
Views: 50

derivations?

Will we have to know how to do the derivations of integrated rate laws for the test?
by JosephineF
Sat Mar 07, 2020 1:04 pm
Forum: Experimental Details
Topic: determining order of reaction
Replies: 6
Views: 119

determining order of reaction

Will we always be given the order of the reaction because it has to be determined experimentally?
by JosephineF
Tue Mar 03, 2020 8:02 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: text problem 6m.1
Replies: 1
Views: 37

text problem 6m.1

The stated short hand for the reaction in the text is M\left | M^{+} \left \| Cu^{2+}\left | Cu But in the solution manual says it's Cu\left | Cu^{2+}\left \| M^{2+}\left |M This affects which element is considered the anode and which is considered the cathode but I'm unclear as to why they reversed...
by JosephineF
Mon Mar 02, 2020 3:29 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: text problem 6L.1
Replies: 1
Views: 22

text problem 6L.1

given the equation how can you tell how many moles of electrons are being used?
by JosephineF
Mon Mar 02, 2020 2:07 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: text problem 4J.7
Replies: 2
Views: 47

Re: text problem 4J.7

they also omit oxygen from the calculation of but not from the calculation of
by JosephineF
Mon Mar 02, 2020 2:05 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: text problem 4J.7
Replies: 2
Views: 47

text problem 4J.7

when finding the \Delta H of the reaction 2H_{2}O_{2}(l)\rightarrow 2H_{2}O_{2}(l)+O_{2}(g) is oxygen not included because it is a gas? Are gases never included in enthalpy formations? Or am I just misinterpreting the solution manual's omission of oxygen in the enthalpy forma...
by JosephineF
Mon Mar 02, 2020 1:49 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: text problem 4J.5
Replies: 2
Views: 98

text problem 4J.5

it is asking to write the balanced formation reaction for NH3. The solution manual says 1/2N2 + 3/2H2 --> NH3. Is there a formula for how to arrive at these numbers or is it just guess and check? I'm confused as to how 2 Ns goes to only 1 N and how H2 gains another H
by JosephineF
Mon Mar 02, 2020 12:11 pm
Forum: Balancing Redox Reactions
Topic: Sapling Assignment 5 problem 9
Replies: 2
Views: 47

Re: Sapling Assignment 5 problem 9

the two equations are: a) MnO_{4}^{-}+S^{2-}\rightarrow S+MnO_{2} b) [Pb(OH)_{4}]^{2-}+ClO^{-}\rightarrow PbO_{2}+Cl^{-} it asks for the oxidizing agent, the reducing agent, and the balanced equation of each. I'm mostly confused on how to determine the oxidation states so that I know which e...
by JosephineF
Sat Feb 29, 2020 1:58 pm
Forum: Balancing Redox Reactions
Topic: Sapling Assignment 5 problem 9
Replies: 2
Views: 47

Sapling Assignment 5 problem 9

I'm having trouble determining the oxidation numbers in order to determine how many electrons are being exchanged for both a and b. I know this is like step 1 and pretty basic stuff but I haven't taken chemistry in 5 years and I was never totally comfortable with this topic anyway. Any tips would be...
by JosephineF
Tue Feb 25, 2020 10:02 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8013
Views: 1401564

Re: Post All Chemistry Jokes Here

for all your extermination needs
by JosephineF
Fri Feb 21, 2020 10:52 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8013
Views: 1401564

Re: Post All Chemistry Jokes Here

chem final outfit ideas
by JosephineF
Fri Feb 21, 2020 4:14 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: midterm Q6A
Replies: 2
Views: 105

midterm Q6A

why is D correct if it is +23 and the given enthalpy is negative? Even when you divide by the number of moles shouldn't it still be negative?
by JosephineF
Fri Feb 21, 2020 4:12 pm
Forum: Identifying Acidic & Basic Salts
Topic: midterm Q4
Replies: 1
Views: 85

midterm Q4

given the ratio of concentrations how do we know that the hydrogen bromide salt remains pronated?
by JosephineF
Fri Feb 21, 2020 4:10 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Midterm question 3D
Replies: 1
Views: 166

Midterm question 3D

how to do you know the net charge of an acid given the pH and the pKa?
by JosephineF
Mon Feb 17, 2020 5:59 pm
Forum: Balancing Redox Reactions
Topic: 6k3 part d
Replies: 4
Views: 44

Re: 6k3 part d

I had the same question. but I guess if it's a typo then it makes sense. If there were to be Cl2 on both sides of the equation would it be solvable?
by JosephineF
Thu Feb 13, 2020 3:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Lavelle's Office Hours
Replies: 5
Views: 119

Lavelle's Office Hours

does anyone know when Lavelle himself holds office hours? I can't find it on the course website. im sure it's somewhere in plain sight but Im just having trouble finding it
by JosephineF
Thu Feb 13, 2020 1:23 pm
Forum: Administrative Questions and Class Announcements
Topic: grading curve
Replies: 10
Views: 135

grading curve

does Lavelle grade on a curve?
by JosephineF
Tue Feb 11, 2020 2:08 pm
Forum: Administrative Questions and Class Announcements
Topic: Pizza Rolls REVIEW Session DOWNLOAD HERE
Replies: 67
Views: 2785

Re: Pizza Rolls REVIEW Session DOWNLOAD HERE

for number 7 I understand how to solve for q but how do you solve for w with so many missing variables from the pv=nrt equation?
by JosephineF
Tue Feb 11, 2020 1:42 pm
Forum: Student Social/Study Group
Topic: set up of the midterm
Replies: 4
Views: 87

set up of the midterm

does anyone know how many questions there will be on the midterm? or what the general set up will be?
by JosephineF
Tue Feb 11, 2020 12:58 pm
Forum: Administrative Questions and Class Announcements
Topic: Pizza Rolls REVIEW Session DOWNLOAD HERE
Replies: 67
Views: 2785

Re: Pizza Rolls REVIEW Session DOWNLOAD HERE

what is the difference between extensive and intensive properties?
by JosephineF
Tue Feb 11, 2020 12:57 pm
Forum: Administrative Questions and Class Announcements
Topic: Pizza Rolls REVIEW Session DOWNLOAD HERE
Replies: 67
Views: 2785

Re: Pizza Rolls REVIEW Session DOWNLOAD HERE

as long as our units are consistent does it matter if we use kJ or J when talking about enthalpy or entropy?
by JosephineF
Tue Feb 11, 2020 12:23 pm
Forum: Student Social/Study Group
Topic: just confirming there is no class Wednesday of the midterm?
Replies: 5
Views: 81

just confirming there is no class Wednesday of the midterm?

just confirming there is no class Wednesday of the midterm?
by JosephineF
Tue Feb 11, 2020 12:19 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: how to find a heat capacity when not given
Replies: 3
Views: 38

how to find a heat capacity when not given

Does anyone know the formula for finding the heat capacity or the specific heat capacity when it is not specifically given in the question?
by JosephineF
Fri Feb 07, 2020 5:44 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: GFE dividing by temp
Replies: 3
Views: 33

GFE dividing by temp

Does anyone have a deeper explanation for why we would divide ΔG by T for the equation -ΔG/T= -ΔH/T + ΔSsys? In lecture I didn't understand what the purpose was for doing this.
by JosephineF
Thu Feb 06, 2020 5:13 pm
Forum: Administrative Questions and Class Announcements
Topic: entropy of state changes on the midterm
Replies: 1
Views: 27

Re: entropy of state changes on the midterm

or Gibbs free energy, because it is also assigned as reading but we haven't covered it in class yet
by JosephineF
Thu Feb 06, 2020 5:09 pm
Forum: Administrative Questions and Class Announcements
Topic: entropy of state changes on the midterm
Replies: 1
Views: 27

entropy of state changes on the midterm

does anyone know potentially how much about entropy of state changes we will have to know for the midterm? It's part of the textbook readings but we haven't talked about much in class yet.
by JosephineF
Thu Feb 06, 2020 11:24 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: sapling problems assignment 3
Replies: 1
Views: 32

sapling problems assignment 3

Does anyone know why in some sapling problems of assignment 3 the equation for q is q=nCdeltaT and then other times its just q=CdeltaT? They remove the quantity of the substance in some problems but im having trouble finding out why they do that.

Thanks!
by JosephineF
Sun Jan 26, 2020 12:31 pm
Forum: Phase Changes & Related Calculations
Topic: Heat vs temperature
Replies: 6
Views: 82

Re: Heat vs temperature

I think this was in reference to the heating curves. My understanding is that if you to take the temperature of the boiling water it would remain the same temperature until there was a phase change even though you are continuing to add heat to the substance in order to induce said phase change.

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