Search found 100 matches

by Jesalynne 2F
Tue Mar 17, 2020 2:45 pm
Forum: Student Social/Study Group
Topic: Coronavirus Joke
Replies: 14
Views: 543

Re: Coronavirus Joke

LOL this definitely helped lighten the mood
by Jesalynne 2F
Sat Mar 14, 2020 4:29 pm
Forum: General Science Questions
Topic: Who makes the Final
Replies: 23
Views: 287

Re: Who makes the Final

I think that Lavelle makes the final and the midterm and the TAs make the tests.
by Jesalynne 2F
Sat Mar 14, 2020 4:25 pm
Forum: Administrative Questions and Class Announcements
Topic: Grading Scale
Replies: 14
Views: 245

Re: Grading Scale

I think he'll use a similar grading scale. The syllabus just says that the cut off for a C- is 50% and nothing in the emails has indicated that the grading scale would be changed.
by Jesalynne 2F
Fri Mar 13, 2020 5:02 pm
Forum: Student Social/Study Group
Topic: Tips for Staying Focused
Replies: 8
Views: 147

Tips for Staying Focused

Hey guys, I've been finding it really hard to focus with everything that has been going on. Does anyone have tips on how to stay focused? I've been trying to study and it has been hard with all the updates for next quarter and the stress from that. Any tips would be appreciated! Thanks in advance. :)
by Jesalynne 2F
Thu Mar 12, 2020 7:52 pm
Forum: Administrative Questions and Class Announcements
Topic: W20, Week 10 Discussion 2F, 2I, 2L
Replies: 10
Views: 572

Re: W20, Week 10 Discussion 2F, 2I, 2L

My TA just had us email our week 10 homework to her. :) You can probably do the same.
by Jesalynne 2F
Wed Mar 11, 2020 2:19 pm
Forum: Administrative Questions and Class Announcements
Topic: Final
Replies: 5
Views: 111

Re: Final

Most likely we'll have to turn in the final online. :)
by Jesalynne 2F
Sun Mar 08, 2020 10:53 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Study Advice
Replies: 73
Views: 3620

Re: Study Advice

I like going through the homework problems to practice doing problems and going through the worksheets from discussion. I like to attend the review sessions that go over the topics I am not understanding or have questions about. Drop-in sessions or office hours would be a good resource if you had sp...
by Jesalynne 2F
Sun Mar 08, 2020 10:17 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Cell Diagram
Replies: 16
Views: 138

Re: Cell Diagram

I think it would be okay for you to assume that the cathode is one the right and the anode is on the left.
by Jesalynne 2F
Sun Mar 08, 2020 10:09 pm
Forum: Balancing Redox Reactions
Topic: e- amount
Replies: 9
Views: 47

Re: e- amount

The number of electrons should be balanced on both sides. You can multiply to get them to equal each other.
by Jesalynne 2F
Sun Mar 01, 2020 9:30 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: first order
Replies: 8
Views: 63

Re: first order

For a first order reaction the graph has -k slope and the graph is linear. The reaction rate is proportional to one of the reactants concentration.
by Jesalynne 2F
Sun Mar 01, 2020 9:22 pm
Forum: Phase Changes & Related Calculations
Topic: Van't Hoff Eq
Replies: 8
Views: 152

Re: Van't Hoff Eq

It would probably be helpful to know how to derive it, but you would probably be okay just knowing the equations relationships.
by Jesalynne 2F
Sun Mar 01, 2020 9:09 pm
Forum: Biological Examples (*DNA Structural Transitions, etc.)
Topic: Examples Expected to Know
Replies: 10
Views: 324

Re: Examples Expected to Know

I would think examples that we are expected to know would be in our notes or possibly from a homework question. For 14A the biological examples that we got on exams were covered in class.
by Jesalynne 2F
Sun Mar 01, 2020 8:34 pm
Forum: Administrative Questions and Class Announcements
Topic: HW 9
Replies: 5
Views: 66

Re: HW 9

For homework 9 I would think you can do homework from the topics that are going to be on test 2 in order to get some more practice in (2nd and 3rd laws of thermodynamics 2nd page and electrochemistry), or you can do homework from kinetics.
by Jesalynne 2F
Sun Mar 01, 2020 8:03 pm
Forum: Balancing Redox Reactions
Topic: Test 2
Replies: 19
Views: 169

Re: Test 2

Test 2 will only cover from the midterm up until the material we covered before kinetics.
by Jesalynne 2F
Sun Feb 23, 2020 9:24 pm
Forum: Administrative Questions and Class Announcements
Topic: Extra Credit
Replies: 17
Views: 199

Re: Extra Credit

There are no extra credit opportunities. In 14A for Lavelle extra credit wasn't offered and it's not in the syllabus, so I assume there won't be any opportunities for extra credit.
by Jesalynne 2F
Sun Feb 23, 2020 9:19 pm
Forum: Ideal Gases
Topic: Conjugate acid and bases
Replies: 7
Views: 146

Re: Conjugate acid and bases

A conjugate base will have one less proton than the acid and the conjugate acid will have one more H+ than the base.
by Jesalynne 2F
Sun Feb 23, 2020 9:12 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cathode vs Anode
Replies: 11
Views: 62

Re: Cathode vs Anode

The cathode is where reduction occurs and the anode is where oxidation occurs. I don't think it necessarily matters what side of the diagram it is on, but the anode is usually on the left side of the diagram and the cathode is on the right side.
by Jesalynne 2F
Sun Feb 23, 2020 4:01 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Spontaneous
Replies: 23
Views: 181

Re: Spontaneous

When delta G is negative the reaction is spontaneous, but when delta G is positive the reaction is not spontaneous. When delta G is equal to 0 then the reaction is not spontaneous because it is at equilibrium.
by Jesalynne 2F
Sun Feb 23, 2020 3:51 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2 Material
Replies: 16
Views: 192

Re: Test 2 Material

Test 2 won't cover material that we'll learn this coming week. The test will cover material from after the midterm, which is the second page of outline 4 and outline 5.
by Jesalynne 2F
Sun Feb 16, 2020 5:24 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Pressure and Moles
Replies: 7
Views: 70

Re: Pressure and Moles

In order to see which way the reaction will shift you would count the coefficients.
by Jesalynne 2F
Sun Feb 16, 2020 5:21 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: 3/2R & 5/2R
Replies: 9
Views: 135

Re: 3/2R & 5/2R

Cp and Cv are used in finding the heat capacity. Cp is for constant pressure and Cv is for constant volume.
by Jesalynne 2F
Sun Feb 16, 2020 5:17 pm
Forum: Administrative Questions and Class Announcements
Topic: grading curve
Replies: 10
Views: 107

Re: grading curve

There is not a curve, but in order to pass the class with a C- you need at least a 50% for your overall grade.
by Jesalynne 2F
Sun Feb 16, 2020 5:13 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: delta h and constant temp and pressure
Replies: 4
Views: 93

Re: delta h and constant temp and pressure

At constant pressure deltaH will be equal to q and at constant pressure it is for a phase change.
by Jesalynne 2F
Sun Feb 16, 2020 5:04 pm
Forum: Ideal Gases
Topic: pv=nrt
Replies: 19
Views: 211

Re: pv=nrt

Yes, this can be used. You would need to plug in the standard temperature and pressure (273 K and 1 atm).
by Jesalynne 2F
Sun Feb 09, 2020 9:31 pm
Forum: Calculating Work of Expansion
Topic: Midterm equation sheet
Replies: 16
Views: 164

Re: Midterm equation sheet

We will get the same equation sheet that is on his 14B website.
by Jesalynne 2F
Sun Feb 09, 2020 9:27 pm
Forum: Ideal Gases
Topic: Gas constant
Replies: 10
Views: 66

Re: Gas constant

You will want to use the constant that has the units that apply to the problem you are solving; you will want the units to cancel to give you the unit you want your answer to be in.
by Jesalynne 2F
Sun Feb 09, 2020 9:03 pm
Forum: Ideal Gases
Topic: Change in pressure
Replies: 7
Views: 82

Re: Change in pressure

If the pressure is increased the reaction would want to go back to equilibrium, so the reaction will shift to the side with fewer gas particles. If the pressure were to decrease then the reaction would go towards the side with more gas particles.
by Jesalynne 2F
Sun Feb 09, 2020 8:53 pm
Forum: Ideal Gases
Topic: reversing reactions
Replies: 14
Views: 133

Re: reversing reactions

For a reverse reaction the value of K would be 1/K which is the inverse.
by Jesalynne 2F
Sun Feb 09, 2020 8:25 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Content
Replies: 6
Views: 64

Re: Midterm Content

I believe that will be included, but like others have said before the midterm will cover content from the the first outline all the way up until the first page of outline 4. The content all the way until this past Friday's lecture will be included.
by Jesalynne 2F
Sun Feb 02, 2020 9:59 pm
Forum: Phase Changes & Related Calculations
Topic: Question about Internal Energy
Replies: 2
Views: 31

Re: Question about Internal Energy

Yes, I believe your line of thinking is correct. :) That is what I have in my notes.
by Jesalynne 2F
Sun Feb 02, 2020 9:13 pm
Forum: Phase Changes & Related Calculations
Topic: 4A. 3 part c)
Replies: 1
Views: 28

Re: 4A. 3 part c)

I am pretty sure you are correct and the answer should be 28 J. I found an old post on chemistry community and that was said to be the correct answer. Also, in my solution manual (old one but the same question) the answer is 28 J. Older post with this question: https://lavelle.chem.ucla.edu/forum/vi...
by Jesalynne 2F
Sun Feb 02, 2020 8:50 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Quadratic Equation
Replies: 5
Views: 90

Re: Quadratic Equation

Like others have said, you would use the quadratic formula when you have x squared and you need to find the value of x. I found this to be helpful: https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Equil...
by Jesalynne 2F
Sun Feb 02, 2020 8:42 pm
Forum: Ideal Gases
Topic: PV=nRT
Replies: 12
Views: 145

Re: PV=nRT

P is pressure, V is volume, n is the number of moles, R is the gas constant (it'll be given to us on the equations and constants sheet), and T is temperature.
by Jesalynne 2F
Sun Feb 02, 2020 8:40 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Test 1
Replies: 6
Views: 77

Re: Test 1

If Q is greater than K, then the reaction will go towards the reactants. If Q is less than K then the reaction will go towards the products.
by Jesalynne 2F
Sun Jan 26, 2020 5:54 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies
Replies: 6
Views: 41

Re: Bond Enthalpies

They were used as an example in lecture, so we won't be expected to draw them.
by Jesalynne 2F
Sun Jan 26, 2020 5:50 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Pressure and equilibrium
Replies: 9
Views: 70

Re: Pressure and equilibrium

If the pressure is increased the reaction will go towards the side with fewer gas particles. If you decrease the pressure the reaction will go to the side with more gas particles.
by Jesalynne 2F
Sun Jan 26, 2020 5:41 pm
Forum: Phase Changes & Related Calculations
Topic: Steam Burns
Replies: 9
Views: 66

Re: Steam Burns

This helped explain it for me: http://scienceline.ucsb.edu/getkey.php?key=1322 More energy is released in a phase change from a gas to a liquid (steam would turn to liquid once it touches skin) compared to boiling water touching skin because it doesn't undergo a phase change (less energy released). ...
by Jesalynne 2F
Sun Jan 26, 2020 5:20 pm
Forum: Phase Changes & Related Calculations
Topic: Steam vs Water
Replies: 4
Views: 30

Re: Steam vs Water

For water to go from a gas to a liquid more energy is required. When the gas turns to a liquid on skin more energy is released than boiling water hitting skin because the boiling water doesn't undergo a phase change. This explains it further: http://scienceline.ucsb.edu/getkey.php?key=1322
by Jesalynne 2F
Sun Jan 26, 2020 4:54 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: suggestions
Replies: 16
Views: 136

Re: suggestions

I find that the Organic Chemistry Tutor really helps, and he does practice problems in the videos too. If you wanted more practice the problems in the book might help since you can check the odd numbered ones in the solution manual.
by Jesalynne 2F
Sun Jan 19, 2020 10:10 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K vs Q
Replies: 14
Views: 73

Re: K vs Q

K is used when the reaction is at equilibrium and Q can be used for other random times in the reaction. Q can be compared to K to see which direction the reaction will go.
by Jesalynne 2F
Sun Jan 19, 2020 10:04 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Q < K
Replies: 16
Views: 97

Re: Q < K

When Q<K you have more reactants, so more products form.
by Jesalynne 2F
Sun Jan 19, 2020 9:58 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: K less than 10^-3
Replies: 5
Views: 53

Re: K less than 10^-3

Since K is less than 10^-3 more reactants are at equilibrium and the reaction sits to the left.
by Jesalynne 2F
Sun Jan 19, 2020 9:45 pm
Forum: Ideal Gases
Topic: R Constant
Replies: 18
Views: 212

Re: R Constant

The R constant will be provided on the "Constants and Formulas" worksheet which can be found on the 14B class website and will be provided on tests and midterms, so we will not have to remember it. The constant can change depending on what units it is in, but different unit forms are also ...
by Jesalynne 2F
Sun Jan 19, 2020 9:33 pm
Forum: Ideal Gases
Topic: Topics on Test 1
Replies: 37
Views: 321

Re: Topics on Test 1

I believe in lecture Lavelle said that test 1 will be outline 1 and 2, which is chemical equilibrium and acids and bases.
by Jesalynne 2F
Sun Jan 12, 2020 8:04 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kp
Replies: 6
Views: 48

Re: Kp

Kp is used when dealing with gases, it is the equilibrium constant calculated from the partial pressures.
by Jesalynne 2F
Sun Jan 12, 2020 7:51 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: memorization
Replies: 12
Views: 98

Re: memorization

I doubt we'll have to memorize any K values. If anything we'll be given that information if it is required to solve a problem.
by Jesalynne 2F
Sun Jan 12, 2020 7:43 pm
Forum: Administrative Questions and Class Announcements
Topic: Test One Content
Replies: 6
Views: 89

Re: Test One Content

I believe we will be tested on outline 1 and outline 2 (or at least parts of outline 2 depending on how far we get). He does let us know what we'll be tested on, but if anything your TA should know too. :) I believe the TAs make the tests so homework problems might not be on the test but they'll be ...
by Jesalynne 2F
Sun Jan 12, 2020 7:40 pm
Forum: Administrative Questions and Class Announcements
Topic: General HW question
Replies: 9
Views: 71

Re: General HW question

It depends on the TA I think. Last quarter my TA graded on correctness but others graded on completeness.
by Jesalynne 2F
Sun Jan 12, 2020 7:34 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Test 1
Replies: 6
Views: 66

Re: Test 1

Test 1 will be given in your discussion section during week 3.
by Jesalynne 2F
Sat Dec 07, 2019 3:28 pm
Forum: Naming
Topic: Transition Metal Latin Names
Replies: 3
Views: 53

Re: Transition Metal Latin Names

I think these are all/the majority of the transition metals with Latin names (this applies when they are in anionic complexes):
Iron - Ferrate
Copper - Cuprate
Lead - Plumbate
Silver - Argentate
Gold - Aurate
Tin - Stannate
by Jesalynne 2F
Sat Dec 07, 2019 2:33 pm
Forum: Naming
Topic: Naming quizlet
Replies: 1
Views: 52

Re: Naming quizlet

Thank you so much this is really helpful!
by Jesalynne 2F
Sat Dec 07, 2019 2:31 pm
Forum: Sigma & Pi Bonds
Topic: Marshmallow 41.C
Replies: 3
Views: 142

Re: Marshmallow 41.C

I think at the review session they said the answer was C=O because the the atomic radius of oxygen is smaller so it'll form a stronger bond.
by Jesalynne 2F
Sat Dec 07, 2019 2:01 pm
Forum: Properties of Electrons
Topic: Mass of an electron
Replies: 9
Views: 255

Re: Mass of an electron

You do not need to remember the mass of an electron since it is one of the constants that will be given on the formula sheet provided. The formula sheet will the same one from the midterm.
by Jesalynne 2F
Sat Dec 07, 2019 1:51 pm
Forum: Significant Figures
Topic: pH sig figs
Replies: 9
Views: 199

Re: pH sig figs

I think for pH sig figs you count the sig figs after the decimal point, at least that's what I remember hearing from a review session. I found an old post that might answer your question better: https://lavelle.chem.ucla.edu/forum/viewtopic.php?t=790
by Jesalynne 2F
Sun Dec 01, 2019 8:29 pm
Forum: Naming
Topic: Final Exam?
Replies: 20
Views: 197

Re: Final Exam?

There was an email sent out that said review sessions would begin December 3rd, but the rooms and times haven't been announced yet, they will be announced Monday in class.
by Jesalynne 2F
Sun Dec 01, 2019 8:26 pm
Forum: Naming
Topic: Final Exam?
Replies: 20
Views: 197

Re: Final Exam?

The final is cumulative and good review would be homework problems, tests, the midterm, and past final questions.
by Jesalynne 2F
Sun Dec 01, 2019 8:00 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Test Grades
Replies: 6
Views: 77

Re: Test Grades

It should probably be posted in the next few days, but my TA already input grades so when grades are input probably depends on the TAs.
by Jesalynne 2F
Sun Dec 01, 2019 7:56 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sigma Bond
Replies: 10
Views: 103

Re: Sigma Bond

Single bonds are sigma bonds, in double bonds there is a sigma and pi bond, and in triple bonds there are two pi bonds and one sigma bond.
by Jesalynne 2F
Sun Dec 01, 2019 7:45 pm
Forum: SI Units, Unit Conversions
Topic: midterm/final
Replies: 18
Views: 540

Re: midterm/final

Based on the midterm there will probably be more calculation problems, but conceptual problems will be on the final as well.
by Jesalynne 2F
Sun Nov 24, 2019 8:52 pm
Forum: Dipole Moments
Topic: Melting points
Replies: 15
Views: 258

Re: Melting points

Intermolecular forces affect the melting points, so the stronger the intermolecular force the higher the melting point and vice versa.
by Jesalynne 2F
Sun Nov 24, 2019 8:49 pm
Forum: Electronegativity
Topic: Increasing/Decreasing Electronegativity
Replies: 9
Views: 156

Re: Increasing/Decreasing Electronegativity

Electronegativity increases up and to the right of the periodic table. It also helps to remember that fluorine is the most electronegative element so electronegativity increases in the direction of fluorine.
by Jesalynne 2F
Sun Nov 24, 2019 8:44 pm
Forum: Lewis Structures
Topic: Bent or Angular?
Replies: 15
Views: 306

Re: Bent or Angular?

The two terms are synonymous, so you can use either one. :)
by Jesalynne 2F
Sun Nov 24, 2019 8:39 pm
Forum: Quantum Numbers and The H-Atom
Topic: Calculating quantum numbers
Replies: 4
Views: 144

Re: Calculating quantum numbers

If you're asked to give the quantum numbers for an atom or an ion you can write out the electron configuration of it and from there you can easily find out the quantum numbers.
by Jesalynne 2F
Sun Nov 24, 2019 8:21 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs on Cenrtral Atom
Replies: 11
Views: 92

Re: Lone Pairs on Cenrtral Atom

Since lone pairs repel the other bonds around the central atom the bond angle between bonds will decrease since they arrange themselves to be away from the lone pair(s).
by Jesalynne 2F
Sun Nov 17, 2019 5:36 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 2
Replies: 19
Views: 208

Test 2

When determining the molecular shape and bond angles do the Lewis structures have to be drawn as accurately as possible?
by Jesalynne 2F
Sun Nov 17, 2019 5:26 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs vs Bonding Pairs
Replies: 2
Views: 32

Re: Lone Pairs vs Bonding Pairs

I am not sure about “taking up space,” but lone pairs have a high repulsion force so they distort the bond angles and force the bonding pairs in the molecule closer together.
by Jesalynne 2F
Sun Nov 17, 2019 5:04 pm
Forum: Trends in The Periodic Table
Topic: trends on test 2
Replies: 4
Views: 136

Re: trends on test 2

We may not be asked specific questions on periodic trends like we were on the midterm, but the topics we will be tested on rely on knowledge that comes from the periodic table. Since the test will cover material after the midterm we will be focusing on outline 4 and a little bit on outline 3 (things...
by Jesalynne 2F
Sun Nov 17, 2019 4:57 pm
Forum: Significant Figures
Topic: Sig Figs on Tests
Replies: 24
Views: 760

Re: Sig Figs on Tests

The number of significant figures you put your answer in is based on the question, so the least amount of significant figures in the question is used.
by Jesalynne 2F
Sun Nov 17, 2019 4:42 pm
Forum: Hybridization
Topic: Homework Outline for Test
Replies: 5
Views: 62

Re: Homework Outline for Test

The majority of the test will probably focus mainly on outline 4 (molecular shape and structure) and a little bit of material from outline 3 may be on there too since things like London forces, dispersion forces, etc. were covered after the midterm I believe.
by Jesalynne 2F
Sun Nov 10, 2019 4:46 pm
Forum: Trends in The Periodic Table
Topic: Electronegativity
Replies: 9
Views: 179

Re: Electronegativity

Yes, you are correct. :) Electronegativity increases up and to the right of the periodic table.
by Jesalynne 2F
Sun Nov 10, 2019 4:35 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability Trends
Replies: 4
Views: 43

Re: Polarizability Trends

Iodine exists as a solid at room temperature because the strength of London forces are in line with iodine's large electron cloud and polarizability. I can't explain it that well, I'm sorry! But this article might be more helpful: https://socratic.org/questions/elemental-iodine-is-a-solid-at-room-te...
by Jesalynne 2F
Sun Nov 10, 2019 4:29 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability Trends
Replies: 4
Views: 43

Re: Polarizability Trends

The greater the number of electrons there are and the greater distance of electrons from the nuclear charge, the less control the nuclear charge has on charge distribution, therefore there is an increased polarizability of the atom.
by Jesalynne 2F
Sun Nov 10, 2019 4:23 pm
Forum: SI Units, Unit Conversions
Topic: Homework from Outline 3 due?
Replies: 5
Views: 157

Re: Homework from Outline 3 due?

You should be fine doing homework from outline 3, since I don't think we've covered material from outline 4 yet. :)
by Jesalynne 2F
Sun Nov 10, 2019 4:13 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Magnetic Quantum numbers
Replies: 13
Views: 269

Re: Magnetic Quantum numbers

The magnetic quantum number (ml) is based on l, the angular momentum quantum number, and ranges from -l to l. So, if l=1 then ml=-1,0,1.
by Jesalynne 2F
Sun Nov 03, 2019 9:22 pm
Forum: Bond Lengths & Energies
Topic: Strength of Bonds
Replies: 16
Views: 154

Re: Strength of Bonds

Shorter bonds are stronger than longer bonds. The strength for three types is triple bond>double bond>single bond, so the stronger bonds are shorter.
by Jesalynne 2F
Sun Nov 03, 2019 9:16 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Aufbau vs Hunds
Replies: 6
Views: 188

Re: Aufbau vs Hunds

Afbau states that the lower energy levels must be occupied before the higher ones can be filled and Hund’s rule states that the orbitals must be filled with one electron before they can be paired.
by Jesalynne 2F
Sun Nov 03, 2019 8:50 pm
Forum: Properties of Light
Topic: Midterm Exam
Replies: 21
Views: 255

Re: Midterm Exam

I think the midterm will be free response/open ended questions. If there are any multiple choice questions there will probably only be a few.
by Jesalynne 2F
Sun Nov 03, 2019 8:44 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Finding electron configurations
Replies: 4
Views: 68

Re: Finding electron configurations

You would write the noble gas that comes before the element you are trying to write the electron configuration number then write the electron configuration for additional electrons in the regular way. I found watching videos helped me more than reading explanations so that might help you too! This o...
by Jesalynne 2F
Sun Nov 03, 2019 8:29 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Homework Problem 1E. 5
Replies: 2
Views: 45

Re: Homework Problem 1E. 5

This is false because Zeffe is affected by the number of electrons in an atom because the electrons are shielded from the full attraction of the nucleus. This occurs because the electron electron repulsions work against the pull of the nucleus.
by Jesalynne 2F
Sun Oct 27, 2019 10:47 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Midterm
Replies: 5
Views: 75

Re: Midterm

Thank you! Do you have any recommendations for how to review how to write the shorthand configuration?
by Jesalynne 2F
Sun Oct 27, 2019 10:44 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Midterm
Replies: 5
Views: 75

Midterm

For the midterm will we have to know how to write the shorthand electron configuration of an element?
by Jesalynne 2F
Sun Oct 27, 2019 10:30 pm
Forum: Resonance Structures
Topic: Resonance
Replies: 3
Views: 61

Resonance

When we draw the resonance structures do we have to draw out all of the possible ways or is a resonance hybrid sufficient enough on its own? Or would we have to draw all of the structures plus the hybrid?
by Jesalynne 2F
Sun Oct 27, 2019 9:57 pm
Forum: Ionic & Covalent Bonds
Topic: Homework
Replies: 13
Views: 176

Re: Homework

I'm pretty sure you can do problems from both since we covered both sections. Like someone said before it might be beneficial to do problems from the chemical bonds section to get more practice on those problems since it'll be on the midterm.
by Jesalynne 2F
Sun Oct 27, 2019 9:39 pm
Forum: *Particle in a Box
Topic: TEST 2
Replies: 13
Views: 365

Re: TEST 2

I think one of the suggested ways to prepare for an exam was to work through the assigned homework problems. I would do those problems and study with someone else so we could ask each other questions and teach each other.
by Jesalynne 2F
Sun Oct 20, 2019 10:00 pm
Forum: Properties of Light
Topic: light regions
Replies: 4
Views: 56

Re: light regions

Is there an easy way to memorize the regions with the corresponding values? Do you use any mnemonic devices?
by Jesalynne 2F
Sun Oct 20, 2019 9:43 pm
Forum: Photoelectric Effect
Topic: 1B.3
Replies: 3
Views: 67

Re: 1B.3

The answer would be d, because the photoelectric effect was explained to have electromagnetic radiation and it’s composed of photons that each have fixed energy that equals to h*v.
by Jesalynne 2F
Sun Oct 20, 2019 9:35 pm
Forum: Photoelectric Effect
Topic: hw 1B.15 part c
Replies: 3
Views: 69

Re: hw 1B.15 part c

I think you would use the wavelength you got from part c and find where it is on the electromagnetic spectrum. There is a figure and table in 1A.2 Electromagnetic Radiation that you can refer to.
by Jesalynne 2F
Sun Oct 20, 2019 8:55 pm
Forum: Properties of Light
Topic: Next test
Replies: 23
Views: 340

Re: Next test

There is a constants and equations sheet posted on the website and I think that is the one we will be given on exams.

link: https://lavelle.chem.ucla.edu/wp-conten ... ations.pdf
by Jesalynne 2F
Sun Oct 20, 2019 8:47 pm
Forum: Properties of Light
Topic: What are the units of hertz
Replies: 41
Views: 393

Re: What are the units of hertz

Hertz is cycles per second and it can be written as 1/s or s^-1
by Jesalynne 2F
Sun Oct 13, 2019 9:00 pm
Forum: Significant Figures
Topic: Significant Figures on Test 1
Replies: 3
Views: 171

Re: Significant Figures on Test 1

I don't think sig figs were really important for this test, but if they were to grade based on that you would just base your sig figs off the values given to you in the question. I hope this helps :)
by Jesalynne 2F
Sun Oct 13, 2019 8:51 pm
Forum: Significant Figures
Topic: Tests and Significant Figures
Replies: 6
Views: 198

Re: Tests and Significant Figures

I think you use the least amount of significant figures based on the values of what is given in the question, but I would definitely check out the post mentioned post to make sure. :)
by Jesalynne 2F
Sun Oct 13, 2019 8:41 pm
Forum: Properties of Light
Topic: Quick question on equations
Replies: 5
Views: 47

Quick question on equations

Just to clarify, we are going to be expected to know the equations we have been given in class regarding light, energy, etc. right? Just asking because on the test they did give us an equation sheet with most of the equations.
by Jesalynne 2F
Sun Oct 13, 2019 8:31 pm
Forum: Photoelectric Effect
Topic: Question about Energy Threshold
Replies: 7
Views: 85

Re: Question about Energy Threshold

The energy threshold won’t be enough to create the photoelectric effect but the energy will be conserved. The energy might be reabsorbed or refracted.
by Jesalynne 2F
Sun Oct 13, 2019 8:24 pm
Forum: Photoelectric Effect
Topic: Question about Energy Threshold
Replies: 7
Views: 85

Re: Question about Energy Threshold

I just want to make sure I'm understanding your question :) are you asking what happens if the photon doesn't have enough energy to remove the electron?
by Jesalynne 2F
Thu Oct 03, 2019 7:07 pm
Forum: SI Units, Unit Conversions
Topic: Formula Names
Replies: 7
Views: 79

Re: Formula Names

I'm guessing if there are any questions in the homework like that then it'll be considered fair game. There is review in the textbook which would probably help with this or other resources like khan academy really help.
by Jesalynne 2F
Thu Oct 03, 2019 6:37 pm
Forum: SI Units, Unit Conversions
Topic: Chemistry Community Question
Replies: 3
Views: 54

Re: Chemistry Community Question

I heard Dr. Lavelle say during lecture that they are due Sunday night by 11:59pm
by Jesalynne 2F
Thu Oct 03, 2019 6:29 pm
Forum: SI Units, Unit Conversions
Topic: Clarification for SI Units
Replies: 4
Views: 74

Re: Clarification for SI Units

You wrote the correct prefixes for each conversion :) and I think to be safe you should know them in order to convert during tests, midterms, etc. in case it is required. Also, Dr. Lavelle mentioned that in chemistry we won't be using the larger units, like giga, often.
by Jesalynne 2F
Thu Oct 03, 2019 5:53 pm
Forum: Balancing Chemical Reactions
Topic: Question on L39
Replies: 1
Views: 62

Re: Question on L39

In order to find the total mass of the tin oxide you would use the total mass of the crucible and the product (28.35 g) and subtract that by mass of the crucible (26.45 g) to get the mass of the product formed. 28.35 g - 26.45 g = 1.90 g In the question they gave you the mass of tin (1.50 g Sn) so t...
by Jesalynne 2F
Thu Oct 03, 2019 5:11 pm
Forum: Significant Figures
Topic: sig figs in calculations
Replies: 4
Views: 51

sig figs in calculations

Should I just use significant figures in my final answer or should I use them throughout the entire process leading up to my answer?

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