Search found 102 matches

by Angela Prince 1J
Tue Mar 10, 2020 9:03 pm
Forum: Student Social/Study Group
Topic: Need suggestions on study websites
Replies: 4
Views: 135

Re: Need suggestions on study websites

Khan Academy is definitely helpful for me, the organic chemistry tutor I heard is also a good one to check out!
by Angela Prince 1J
Tue Mar 10, 2020 8:49 pm
Forum: Student Social/Study Group
Topic: Lyndon Review
Replies: 6
Views: 255

Re: Lyndon Review

did lyndon already put up the worksheet?
by Angela Prince 1J
Tue Mar 10, 2020 8:48 pm
Forum: Student Social/Study Group
Topic: Number of Chemistry Community Posts
Replies: 33
Views: 718

Re: Number of Chemistry Community Posts

I was curious about this too and whether or not we simply needed 100 posts by the end of this quarter. I believe I had more than 50 last quarter but was not sure if I would still need 50 more posts this quarter or just the remainder to 100. I would definitely assume that it resets this quarter so t...
by Angela Prince 1J
Tue Mar 10, 2020 8:47 pm
Forum: Student Social/Study Group
Topic: Number of Chemistry Community Posts
Replies: 33
Views: 718

Re: Number of Chemistry Community Posts

ashwathinair wrote:Sometimes I post multiple times on the same thread - is this counted as separate posts or as just one?


if you post multiple times on the same thread it will still count as separate posts.
by Angela Prince 1J
Tue Mar 10, 2020 8:44 pm
Forum: Student Social/Study Group
Topic: Curve?
Replies: 31
Views: 1371

Re: Curve?

So the syllabus says that a 50% is required o pass the class with at least a C- but at the same time, "there's no curve" is what I've been hearing from most students so if I have a 75% in the class it'll remain the same but if I get a 50% it'll jump up to 70%? The "curve" is bas...
by Angela Prince 1J
Tue Mar 10, 2020 8:42 pm
Forum: Student Social/Study Group
Topic: The Final
Replies: 5
Views: 202

Re: The Final

He hasn't sent an email yet, but I'm assuming the review sessions are cancelled, right?
by Angela Prince 1J
Wed Mar 04, 2020 8:55 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6M.1
Replies: 3
Views: 37

Re: 6M.1

So just to clarify, if we use the E^o= E^o(Cathode)- E^o(Anode) method, we don't switch the signs but if we use the adding method, we do have to switch the signs?
by Angela Prince 1J
Wed Mar 04, 2020 8:49 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6M.1
Replies: 3
Views: 37

Re: 6M.1

how is the Cu(s)|Cu2+ the anode if it is on the right of the cell diagram?
by Angela Prince 1J
Wed Mar 04, 2020 7:24 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6L.7
Replies: 3
Views: 78

Re: 6L.7

for part a) why could we not just split up the half-reactions into Ag and Br separately?
by Angela Prince 1J
Wed Mar 04, 2020 7:10 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams
Replies: 7
Views: 49

Re: Cell Diagrams

Also, why do we not use the balanced redox reaction (and each molecule's stoichiometric coefficients) when writing out the cell diagram?
by Angela Prince 1J
Wed Mar 04, 2020 6:57 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams
Replies: 7
Views: 49

Cell Diagrams

When you have a nonmetal in the reaction, how do you know when to use platinum and when to use graphite as an inert conductor?
by Angela Prince 1J
Fri Feb 28, 2020 3:40 pm
Forum: Balancing Redox Reactions
Topic: Test 2
Replies: 10
Views: 88

Test 2

Can someone please tell me what is being covered on test 2 again?
by Angela Prince 1J
Fri Feb 28, 2020 3:36 pm
Forum: Balancing Redox Reactions
Topic: REDOX Agents
Replies: 9
Views: 97

Re: REDOX Agents

Leslie Almaraz 4G wrote:what is the purpose of identifying the agents?


I think the main reason is just to understand that redox reactions work of each other. A reaction that oxidizes one molecule has to be paired to one that reduces another, and the electrons that are taken from one are given to another.
by Angela Prince 1J
Fri Feb 28, 2020 3:34 pm
Forum: Balancing Redox Reactions
Topic: REDOX Agents
Replies: 9
Views: 97

Re: REDOX Agents

Why are the species that are oxidized called reducing agents and vice versa? something that is oxidized is a reducing agent because in becoming oxidized, it reduces another molecule. the same goes for the other way around: a molecule that was reduced had to have oxidized another for it to reach tha...
by Angela Prince 1J
Fri Feb 28, 2020 3:31 pm
Forum: Balancing Redox Reactions
Topic: How to tell if its being reduced or oxidized
Replies: 15
Views: 202

Re: How to tell if its being reduced or oxidized

That makes sense but when I tried it for 6K.3 on the hw, I got confused again. How would you write the half reactions for part a?

Cl2 + S2O3^2- goes to Cl^- + SO4^2-
by Angela Prince 1J
Fri Feb 28, 2020 3:26 pm
Forum: Balancing Redox Reactions
Topic: Writing half reactions
Replies: 9
Views: 101

Re: Writing half reactions

it makes sense to do it that way, but would it necessarily be wrong to write it the other way around?
by Angela Prince 1J
Sat Feb 22, 2020 11:21 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Ways to Calculate Standard Cell Potentials
Replies: 3
Views: 63

Re: Ways to Calculate Standard Cell Potentials

You only reverse one of the reactions and change the sign of one of the standard potentials with the first method. If you try reversing and changing the signs with the second method, you get a different value entirely. Conceptually, why can you not reverse the cell potential value of the reversed r...
by Angela Prince 1J
Sat Feb 22, 2020 11:15 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Electrode
Replies: 3
Views: 35

Re: Electrode

Why is platinum used above graphite and other inert conductors?
by Angela Prince 1J
Sat Feb 22, 2020 11:12 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: How to write Cell Diagrams
Replies: 5
Views: 67

Re: How to write Cell Diagrams

The basic structure of a cell diagram is (left) anode || (right) cathode, where || represents a salt bridge. You want to put the substance being oxidized on the left and and the substance being reduced on the right so that the voltage is positive. Within the left or right side, you want to write ou...
by Angela Prince 1J
Sat Feb 22, 2020 10:48 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Purpose of Salt Bridge
Replies: 12
Views: 117

Re: Purpose of Salt Bridge

the purpose of the salt bridge is to neutralize the two reactions.
by Angela Prince 1J
Sat Feb 22, 2020 10:44 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Galvanic Cells
Replies: 8
Views: 52

Re: Galvanic Cells

Orrin Zhong 4G wrote:Galvanic cells use the energy from spontaneous redox reactions. As the electrons go from the anode to the cathode along a wire, the flow of electrons can be used to do work.


Is it possible for the electrons to flow the opposite way?
by Angela Prince 1J
Fri Feb 14, 2020 12:02 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Pizza Rolls 6 (pt.1)
Replies: 10
Views: 228

Re: Pizza Rolls 6 (pt.1)

Leila_4G wrote:We are never given T so we can't solve the last step for w and therefore q.


You can use pV=nRT to solve for T and then solve for work.
by Angela Prince 1J
Thu Feb 13, 2020 11:51 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Pizza Rolls 6 (pt.1)
Replies: 10
Views: 228

Re: Pizza Rolls 6 (pt.1)

It is because you are considering delta U and delta S over the ENTIRE process, and because they are state functions, their pathway does not matter. In the problem, the final volume and pressure are the same so the change in either is 0.
by Angela Prince 1J
Thu Feb 13, 2020 11:48 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Why is delta U a state function?
Replies: 4
Views: 67

Re: Why is delta U a state function?

Why is heat capacity a state function?
by Angela Prince 1J
Tue Feb 11, 2020 10:36 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: HW 4I. 5
Replies: 2
Views: 97

HW 4I. 5

"Suppose that 50.0g of water at 20.0 C is mixed with 65.0g of water at 50.0 C at constant atmospheric pressure in a thermally insulated vessel. Calculate delta S and delta S total for the process."

How would I go about solving this problem?
by Angela Prince 1J
Tue Feb 11, 2020 10:33 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: HW 4F.17
Replies: 1
Views: 46

HW 4F.17

I don't know how to calculate this with the information given, but I think it has to do with the nCLn(T2/T1) formula, right? "Calculate the standard entropy of vaporization of water at 85 C, given that its standard entropy of vaporization at 100 C is 109.0 J/Kmol and the molar heat capacities a...
by Angela Prince 1J
Fri Feb 07, 2020 10:28 am
Forum: Student Social/Study Group
Topic: Any Worksheets from UA/TA/etc?
Replies: 14
Views: 287

Re: Any Worksheets from UA/TA/etc?

I know that Lyndon always posts a worksheet before his big review session, but I don't think he has uploaded one yet (hopefully soon!)
by Angela Prince 1J
Fri Feb 07, 2020 10:25 am
Forum: Student Social/Study Group
Topic: Curve?
Replies: 31
Views: 1371

Re: Curve?

if anyone knows more about this may they please update us, I have this similar question. As long as you receive half the points in the class, you will pass with at least a C-, but the actual letter grades will vary each quarter depending on class averages (which is why he waits until the end to dec...
by Angela Prince 1J
Fri Feb 07, 2020 10:20 am
Forum: Student Social/Study Group
Topic: Midterm Topics
Replies: 12
Views: 165

Re: Midterm Topics

So I'm assuming that everything covered up through today's lecture (Fri 02/07) is going to be on the midterm, right?
by Angela Prince 1J
Fri Feb 07, 2020 10:18 am
Forum: Student Social/Study Group
Topic: midterm/final
Replies: 12
Views: 178

Re: midterm/final

i find that the tests are very straightforward and math based questions, but the midterm questions are very implicit and challenging (in my opinion). you really need to know and understand the concepts to be able to solve the questions on the midterms and the final.
by Angela Prince 1J
Fri Feb 07, 2020 10:14 am
Forum: Student Social/Study Group
Topic: Midterm and Final Question
Replies: 18
Views: 257

Re: Midterm and Final Question

there's no official study guide, but there are plenty of review sessions. the UA's also put together a big review session going over all the topics, and they upload a worksheet for it (which is very helpful).
by Angela Prince 1J
Thu Jan 30, 2020 11:46 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 4C.3 Change in Enthalpy
Replies: 3
Views: 120

Re: 4C.3 Change in Enthalpy

For question 4C.3, it asks "Calculate the final temperature and the change in enthalpy when 765 J of energy is transferred as heat to 0.820 mol Kr(g) at 298 K and 1.00 atm (a) at constant pressure; (b) at constant vol- ume. Treat the gas as ideal." I understand how to calculate the final ...
by Angela Prince 1J
Thu Jan 30, 2020 11:43 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: explain terms
Replies: 2
Views: 58

Re: explain terms

I am confused about how finding the standard enthalpy using the standard enthalpies of formation works. How and why does it work? Are the values of the standard enthalpy of formation negative because the molecule is losing energy in creating a bond?
by Angela Prince 1J
Thu Jan 30, 2020 11:35 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Delta H v. q
Replies: 5
Views: 70

Re: Delta H v. q

Delta H is equal to q only when the gas is at a constant pressure. By definition, enthalpy (deltaH) is the amount of heat released/absorbed at a CONSTANT PRESSURE, so the heat required to change temp of gas at a constant pressure is the same as enthalpy.
by Angela Prince 1J
Thu Jan 30, 2020 11:28 am
Forum: Phase Changes & Related Calculations
Topic: Molar Heat Capacity at Cp s. Cv
Replies: 4
Views: 61

Molar Heat Capacity at Cp s. Cv

I am kinda confused on the differences between the molar heat capacity of a gas at constant volume versus constant pressure. Why does it matter in terms of molar heat (is it applicable for specific heat as well)? Can you use the q=nCdeltaT equation for either situation?
by Angela Prince 1J
Thu Jan 30, 2020 11:16 am
Forum: Phase Changes & Related Calculations
Topic: 4A. 1 Identifying open and closed system
Replies: 11
Views: 256

Re: 4A. 1 Identifying open and closed system

c) is an isolated system because the calorimeter does not allow exchange of matter or eneergy with the surroundings, and d) is an open system because gasoline in an automobile can change in tempertaure (energy) and in matter (which is why we need to refill our tank).
by Angela Prince 1J
Thu Jan 23, 2020 6:33 pm
Forum: Ideal Gases
Topic: Acid and Bases
Replies: 16
Views: 140

Re: Acid and Bases

Yes, a pH lower than 7 is acidic, and a pH higher than 7 is basic.
by Angela Prince 1J
Thu Jan 23, 2020 6:31 pm
Forum: Ideal Gases
Topic: solids and K
Replies: 8
Views: 77

Re: solids and K

solids do not have concentration or partial pressure.
by Angela Prince 1J
Thu Jan 23, 2020 6:30 pm
Forum: Ideal Gases
Topic: Kc vs Kp
Replies: 43
Views: 512

Re: Kc vs Kp

connie 2C wrote:when a chemical equation is written and all the reactants and products are gases, do you use Kp rather than Kc? in what cases do you use Kc rather than Kp?

You can use whatever is convenient when they're all gases. You cannot use KP if it's not a gas.
by Angela Prince 1J
Thu Jan 23, 2020 6:27 pm
Forum: Ideal Gases
Topic: homework #3
Replies: 16
Views: 213

Re: homework #3

you can either do acids/bases or thermochemistry.
by Angela Prince 1J
Thu Jan 23, 2020 6:23 pm
Forum: Ideal Gases
Topic: test 1
Replies: 9
Views: 106

Re: test 1

test 1 only covers chemical equilibrium & acids/bases.
by Angela Prince 1J
Wed Jan 15, 2020 5:02 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Endothermic and exothermic reactions
Replies: 11
Views: 633

Re: Endothermic and exothermic reactions

If the temperature increases, the reaction will favor the products in an endothermic reaction because it requires heat to form the product. If you add heat, the reaction is going to want to use up that heat. Therefore, in an endothermic reaction, the reaction will continue forward, towards the produ...
by Angela Prince 1J
Wed Jan 15, 2020 4:43 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: What is this?
Replies: 23
Views: 629

Re: What is this?

Le Chatelier's principle just emphasizes the fact that reactions like to maintain equilibrium, so if anything disrupts that equilibrium (i.e. change in conc., change in volume/pressure), the reaction will shift in order to get back to that equilibrium state. We just use this knowledge to recognize t...
by Angela Prince 1J
Wed Jan 15, 2020 4:30 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: volume change with inert gas
Replies: 9
Views: 95

Re: volume change with inert gas

the inert gas will not affect the concentration or partial pressures of the products or the reactants, they will remain constant so the reaction does not shift.
by Angela Prince 1J
Wed Jan 15, 2020 4:14 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: volume's effect on K
Replies: 7
Views: 63

Re: volume's effect on K

I know Prof. Lavelle mentioned this in lecture briefly, but why are neither the products nor the reactants favored when the volume decreases and the number of moles are equal on both sides?
by Angela Prince 1J
Wed Jan 15, 2020 4:01 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Endothermic and Exothermic Reactions Class Example
Replies: 5
Views: 58

Re: Endothermic and Exothermic Reactions Class Example

N2 is more stable in that it has a triple bond. energy is always required to break bonds and released to make bonds. since the N2 bonds must be broken, it is an endothermic reaction.
by Angela Prince 1J
Fri Jan 10, 2020 4:40 pm
Forum: Ideal Gases
Topic: Solving for K (coefficients)
Replies: 11
Views: 108

Re: Solving for K (coefficients)

The coefficients go with the molecule it is next to in the chemical reaction. The coefficients will be the exponent the concentration of the respective molecule is raised to.
by Angela Prince 1J
Fri Jan 10, 2020 4:32 pm
Forum: Ideal Gases
Topic: PV=nRT equation manipulation
Replies: 13
Views: 221

Re: PV=nRT equation manipulation

Ok I see, but there won't be any problems that give both concentration and pressure for different elements right? manipulating the ideal gas law equation gives us a way to convert either partial pressure to concentration or vice versa. so, even if a problem provides values both ways, we should be a...
by Angela Prince 1J
Fri Jan 10, 2020 4:21 pm
Forum: Ideal Gases
Topic: Difference between K and Q
Replies: 9
Views: 76

Re: Difference between K and Q

Q is the reaction quotient, which is the ratio of the reaction at any given time, not just when the system is at equilibrium.
by Angela Prince 1J
Fri Jan 10, 2020 4:15 pm
Forum: Ideal Gases
Topic: R in PV=nRT
Replies: 34
Views: 669

Re: R in PV=nRT

R is the ideal gas constant, which will probably be given to us on a test/exam.
by Angela Prince 1J
Fri Jan 10, 2020 4:13 pm
Forum: Ideal Gases
Topic: What is the Importance of homogeneous vs heterogeneous equilibria [ENDORSED]
Replies: 12
Views: 167

Re: What is the Importance of homogeneous vs heterogeneous equilibria [ENDORSED]

It's also important to note that for a homogeneous gas equilibrium, we can calculate Kp, but we cannot calculate Kp for a heterogeneous equilibrium that involves both gas and aqueous species. Thank you for pointing that out! We would have to convert everything into concentrations, not partial press...
by Angela Prince 1J
Sat Dec 07, 2019 10:26 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 133
Views: 33558

Re: Final Jitters

I just try to go over as much as I can without overwhelming myself; when I start to get stressed I just stop and do something I enjoy to distract myself. sometimes I will come back to studying later if I feel I need it.
by Angela Prince 1J
Sat Dec 07, 2019 6:49 pm
Forum: Lewis Acids & Bases
Topic: Lewis vs Bronsted
Replies: 3
Views: 29

Re: Lewis vs Bronsted

yea, bronsted def has to do with protons while lewis def does not
by Angela Prince 1J
Sat Dec 07, 2019 6:47 pm
Forum: SI Units, Unit Conversions
Topic: midterm/final
Replies: 18
Views: 622

Re: midterm/final

the test will prob consist more of calculation with a few concept questions thrown in, but you need to know all the concepts to answer the questions.
by Angela Prince 1J
Sat Dec 07, 2019 6:43 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: chelating ligands [ENDORSED]
Replies: 21
Views: 6235

Re: chelating ligands [ENDORSED]

Elizabeth Harty 3A wrote:How do you know if there are sigma bonds available for rotation?


all sigma bonds can rotate, but pi bonds cannot
by Angela Prince 1J
Sat Dec 07, 2019 6:03 pm
Forum: Student Social/Study Group
Topic: amphoteric vs. amphiprotic
Replies: 4
Views: 153

amphoteric vs. amphiprotic

is there a difference between amphiprotic and amphoteric?
by Angela Prince 1J
Tue Nov 26, 2019 5:48 pm
Forum: Student Social/Study Group
Topic: Cyano vs. Cyanido
Replies: 3
Views: 165

Cyano vs. Cyanido

What is the difference between cyano and cyanido when naming coordination complexes?
by Angela Prince 1J
Tue Nov 26, 2019 5:47 pm
Forum: Student Social/Study Group
Topic: Grades
Replies: 18
Views: 401

Re: Grades

KayleyW_3L wrote:In addition to wondering when the Test 1 grades will be posted, I am also curious whether there is partial credit on the exams?


definitely!! show as much work as possible, and if you show that know the concept, you will get at least a couple points.
by Angela Prince 1J
Tue Nov 26, 2019 5:44 pm
Forum: Student Social/Study Group
Topic: -ate Nomenclature for final?
Replies: 2
Views: 58

Re: -ate Nomenclature for final?

If anything, it might be covered in the next few lectures.
by Angela Prince 1J
Tue Nov 26, 2019 5:43 pm
Forum: Student Social/Study Group
Topic: Test 2 and Final
Replies: 18
Views: 226

Re: Test 2 and Final

I heard that the final is 8 questions and will cover all the topics, but there will be quite a bit on quantum.
by Angela Prince 1J
Tue Nov 26, 2019 5:41 pm
Forum: Student Social/Study Group
Topic: Test 2 and Final
Replies: 18
Views: 226

Re: Test 2 and Final

AlyshaP_3G wrote:
205150314 wrote:Does anyone know if we will get some sort of study tools again?

I'm sure Lavelle will be coordinating review sessions like he did for the midterm.


yea my TA said they are going to be holding multiple review sessions covering all the topics we've learned.
by Angela Prince 1J
Tue Nov 26, 2019 5:41 pm
Forum: Student Social/Study Group
Topic: Test 2 and Final
Replies: 18
Views: 226

Re: Test 2 and Final

AlyshaP_3G wrote:
205150314 wrote:Does anyone know if we will get some sort of study tools again?

I'm sure Lavelle will be coordinating review sessions like he did for the midterm.


yea my TA said they are going to be holding multiple review sessions covering all the topics we've learned.
by Angela Prince 1J
Fri Nov 22, 2019 4:42 pm
Forum: Coordinate Covalent Bonds
Topic: Dissociation energy
Replies: 3
Views: 173

Re: Dissociation energy

Just in terms of the number of bonds, a molecule with two double bonds would have a higher dissociation energy than one with two single bonds, granted there are no lone pairs on either molecule?
by Angela Prince 1J
Fri Nov 22, 2019 4:37 pm
Forum: Coordinate Covalent Bonds
Topic: Coordinate vs polar covalent
Replies: 6
Views: 225

Re: Coordinate vs polar covalent

Okay, so just to clarify, lewis acids are the electron donors that give up the electrons and lewis bases receive those electrons, right?
by Angela Prince 1J
Fri Nov 22, 2019 4:32 pm
Forum: Coordinate Covalent Bonds
Topic: coordinate covalent bond
Replies: 9
Views: 242

Re: coordinate covalent bond

Do coordinate covalent bonds occur between atoms in one molecule or between two or more molecules?
by Angela Prince 1J
Fri Nov 22, 2019 4:28 pm
Forum: Coordinate Covalent Bonds
Topic: bond question
Replies: 5
Views: 179

Re: bond question

In general I think pretty much all of the stuff we talk about in this class occurs in nature. You can think of bonds as attempts to lower the energy of the atom. If forming a coord. covalent bond brings the atom to a lower energy that it had with a lone pair, it will do it. Probably a dumb question...
by Angela Prince 1J
Fri Nov 22, 2019 4:26 pm
Forum: Coordinate Covalent Bonds
Topic: Coordinate covalent bonds
Replies: 7
Views: 209

Re: Coordinate covalent bonds

Do coordinate covalent bonds happen only in transition metals?
And does it occur in all transition metals or are there exceptions?
by Angela Prince 1J
Sat Nov 16, 2019 5:27 pm
Forum: Student Social/Study Group
Topic: chem 14b + cehm14bl
Replies: 9
Views: 154

Re: chem 14b + cehm14bl

honestly, it's just preference, but I would personally take the lab with the class just bc every topic covered will stay fresh in your mind as you do the lab for that specific topic.
by Angela Prince 1J
Sat Nov 16, 2019 5:22 pm
Forum: Student Social/Study Group
Topic: Study Tips
Replies: 58
Views: 2124

Re: Study Tips

Is it a good idea to review online modules before lectures so that I can be familiar with what is going to be lectured on? Or should I review after I have had the lecture? Thank you :) YES this is what helps me the most! I think you can definitely try it both ways and see which works best for you!,...
by Angela Prince 1J
Sat Nov 16, 2019 5:15 pm
Forum: Student Social/Study Group
Topic: Dipole Moment
Replies: 5
Views: 83

Re: Dipole Moment

A dipole moment happens when there is a separation of charge. It can occur in both ionic bonds and covalent bonds and are due to difference in electronegativity. It describes two opposite charges separated by distance.Essentially, it is a measure of the polarity of the molecule. so a compound is po...
by Angela Prince 1J
Sat Nov 16, 2019 5:09 pm
Forum: Student Social/Study Group
Topic: Dipole Moment
Replies: 5
Views: 83

Re: Dipole Moment

Basically, in really broad terms, a dipole moment is found between two atoms who are sharing an electron. Due to one's higher electron affinity, it might hold the electron closer to it than its partner. The increase in negativity as the electron is closer to an atom is what the dipole moment is, if...
by Angela Prince 1J
Sat Nov 16, 2019 5:07 pm
Forum: Student Social/Study Group
Topic: Test 2
Replies: 7
Views: 133

Re: Test 2

so, just to clarify, test 2 covers dipoles and molecular shapes?
by Angela Prince 1J
Fri Nov 08, 2019 3:17 pm
Forum: Student Social/Study Group
Topic: Final
Replies: 11
Views: 212

Re: Final

Yes, it is on Sunday Dec 8 at 11:30 am
by Angela Prince 1J
Fri Nov 08, 2019 3:15 pm
Forum: Student Social/Study Group
Topic: Dipole Moment
Replies: 5
Views: 83

Dipole Moment

Can someone explain what a dipole moment is exactly?
by Angela Prince 1J
Fri Nov 08, 2019 3:14 pm
Forum: Student Social/Study Group
Topic: Class Grading
Replies: 44
Views: 2069

Re: Class Grading

KayleyW_3L wrote:The good thing is he will never curve down, only up.


Wait, so is there a curve or not?
by Angela Prince 1J
Fri Nov 08, 2019 3:11 pm
Forum: Student Social/Study Group
Topic: Midterm
Replies: 3
Views: 90

Midterm

Can someone explain the first question about finding the empirical formula of that compound that was on the midterm?
by Angela Prince 1J
Mon Nov 04, 2019 11:19 pm
Forum: Student Social/Study Group
Topic: HW 2D13
Replies: 1
Views: 61

HW 2D13

Could someone help me with this problem?
it is asking to list the following molecules/ions in order of decreasing bond lengths and explain your reasoning:
a) the CO bond in CO, CO2, CO3 2-
b) the SO bond in SO2, SO3, SO3 2-
c) the CN bond in HCN, CH2NH, CH3NH2
by Angela Prince 1J
Thu Oct 31, 2019 6:14 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg equation [ENDORSED]
Replies: 73
Views: 3721

Re: Rydberg equation [ENDORSED]

ShreyaKannan1B wrote:Is there any problem where you would use Rydberg with another equation?


from my understanding, you would only use the Rydberg EQ when you are looking for the change in energy when an electron moves from one energy level to another.
by Angela Prince 1J
Thu Oct 31, 2019 6:10 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice on Homework
Replies: 13
Views: 234

Re: Advice on Homework

sbeall_1C wrote:Hey! I am planning on doing all the questions listed on the syllabus. Should I turn in all of them or just 5 of them?


you can turn in just 5 or all of them, I don't think it matters. the TA will probably just grade the first 5 if you turn all of them in.
by Angela Prince 1J
Thu Oct 31, 2019 6:08 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 16
Views: 191

Re: Midterm

everything covered so far up to focus 2D will be on the midterm, but I wouldn't worry too much about the fundamentals because we already had a test covering that material. I would still look over it though :)
by Angela Prince 1J
Thu Oct 31, 2019 6:06 pm
Forum: Administrative Questions and Class Announcements
Topic: Do Midterm Review Sessions Repeat Topics?
Replies: 4
Views: 62

Re: Do Midterm Review Sessions Repeat Topics?

there are many review sessions covering the same topic, so if you can't make one, don't worry about it! for specifics, the schedule is posted on the website
by Angela Prince 1J
Thu Oct 31, 2019 6:04 pm
Forum: Administrative Questions and Class Announcements
Topic: Study Tips!
Replies: 7
Views: 105

Re: Study Tips!

all those tips are really helpful! in addition, i would go over all the problem sets again and see if you can solve them without too much help from the textbook and your notes
by Angela Prince 1J
Thu Oct 24, 2019 12:21 pm
Forum: Student Social/Study Group
Topic: Ionization Energy vs. e- Affinity
Replies: 3
Views: 73

Ionization Energy vs. e- Affinity

What is the difference between an atom's ionization energy and the e- affinity, and what are the trends on the periodic table for both?
by Angela Prince 1J
Thu Oct 24, 2019 12:19 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 147
Views: 104602

Re: Reading the textbook [ENDORSED]

Are the hw problems for week 5 from the quantum topic set still or from the chemical bonds set?
by Angela Prince 1J
Thu Oct 24, 2019 12:18 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 147
Views: 104602

Re: Reading the textbook [ENDORSED]

KTran 1I wrote:Are there a lot of topics in the book that are not covered during lecture that show up on tests?


I don't think topics not covered during lecture will ever show up on any exam.
by Angela Prince 1J
Thu Oct 24, 2019 12:14 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg equation [ENDORSED]
Replies: 73
Views: 3721

Re: Rydberg equation [ENDORSED]

i understand why the first equation prof. lavelle showed us is negative (-hR/n^2). when he derived the second equation (-R[1/n1^2-1/n2^2]) he kept the negative in front but my TA showed that equation as positive. Which is correct?
by Angela Prince 1J
Thu Oct 24, 2019 12:08 pm
Forum: DeBroglie Equation
Topic: Photon Equation
Replies: 4
Views: 90

Re: Photon Equation

no need to worry about it! Prof Lavelle mentioned the tests would already provide the photon's momentum!
by Angela Prince 1J
Thu Oct 17, 2019 10:24 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Wavelength Plausibility
Replies: 31
Views: 1443

Re: Wavelength Plausibility

APatel_4A wrote:He said that it is 720 to 400 but that we can just remember 700 to 400 since it's easier!


Because it differs so much according to different tables, I think it will be fine if you just remember 700 to 400
by Angela Prince 1J
Thu Oct 17, 2019 10:15 pm
Forum: Administrative Questions and Class Announcements
Topic: How to find my posts
Replies: 58
Views: 48569

Re: How to find my posts

Liza Hayrapetyan-3K wrote:I just want to be clear, so there is no way to get notifications if Professor Lavelle has posted anything?


I don't think you will get actual notifications, you just have to look on the class announcements page.
by Angela Prince 1J
Thu Oct 17, 2019 10:12 pm
Forum: Administrative Questions and Class Announcements
Topic: Tutoring? [ENDORSED]
Replies: 71
Views: 72189

Re: Tutoring? [ENDORSED]

Also, do the workshops go over what we talk about in lecture?
by Angela Prince 1J
Thu Oct 17, 2019 10:10 pm
Forum: Administrative Questions and Class Announcements
Topic: Tutoring? [ENDORSED]
Replies: 71
Views: 72189

Re: Tutoring? [ENDORSED]

I attended a step up session the other day, but the pace was way too slow for me? I'm thinking I should just attend the workshops. Does anyone know how the pace is for the workshops?
by Angela Prince 1J
Thu Oct 17, 2019 10:04 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 [ENDORSED]
Replies: 107
Views: 5092

Re: Test 1 [ENDORSED]

I can't find my test grades on ccle, where do I go?
by Angela Prince 1J
Thu Oct 10, 2019 11:26 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 2 Homework Problems [ENDORSED]
Replies: 67
Views: 3456

Re: Week 2 Homework Problems [ENDORSED]

For homework assignment week 3 would we be able to do week 2 homework problems as well or is it just going to be week 3 homework problems? Week 3 homework is only on Quantum Mechanics; the only reason Prof Lavelle allowed us to use the fundamentals for week 2 homework is because he was giving us th...
by Angela Prince 1J
Thu Oct 10, 2019 11:21 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 147
Views: 104602

Re: Reading the textbook [ENDORSED]

ktran Disc 1I wrote:Are there a lot of topics in the book that are not covered during lecture that show up on tests?


I don't think so. I think everything that will be on a test will be covered in lecture or otherwise noted in the outlines for each topic.
by Angela Prince 1J
Thu Oct 10, 2019 12:16 am
Forum: Administrative Questions and Class Announcements
Topic: Week 2 Homework Problems [ENDORSED]
Replies: 67
Views: 3456

Re: Week 2 Homework Problems [ENDORSED]

Does anyone know if we will be on the quantum topic for more than just one week? I just want to know if the homework set for quantum will be used for both weeks 3 and 4. Thanks!
by Angela Prince 1J
Thu Oct 10, 2019 12:08 am
Forum: Limiting Reactant Calculations
Topic: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
Replies: 68
Views: 3880

Re: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]

Because each question is worth so many points, it would be wise to show at least the basic steps that you used to get to your solution.
by Angela Prince 1J
Mon Oct 07, 2019 11:38 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 133
Views: 33558

Re: Final Jitters

What works for me is to study the concepts that I struggle with, just look over the ones I know just to make sure I have them down, but not to psych myself out studying until the last minute. I tend to overstudy, and I've learned over the years that if I take the time just before a test to just rela...
by Angela Prince 1J
Thu Oct 03, 2019 9:12 pm
Forum: Molarity, Solutions, Dilutions
Topic: Help on HW: Fundamentals G5
Replies: 3
Views: 105

Re: Help on HW: Fundamentals G5

I would start by using the equation for molarity and go from there: Molarity = number of mols/volume for part a, we can find the numbers of mols of Na2CO3 by taking 2.111 grams and dividing it by the molar mass of Na2CO3, which is about 106. Hence, we get 2.111/106 = 0.01992 mol Na2CO3. To find the...
by Angela Prince 1J
Thu Oct 03, 2019 1:31 pm
Forum: Molarity, Solutions, Dilutions
Topic: Solving for Volume G.5 a)
Replies: 8
Views: 207

Re: Solving for Volume G.5 a)

So this problem is asking us to determine the volume of the solution should be transferred into a flask in order to obtain 2.15 mmol of Na+ . Importantly, this is not a dilution problem. Therefore, we won't be using the M1V1=M2V2 equation. The molarity of the solution won't be changing when we tran...
by Angela Prince 1J
Thu Oct 03, 2019 1:04 pm
Forum: Molarity, Solutions, Dilutions
Topic: Help on HW: Fundamentals G5
Replies: 3
Views: 105

Help on HW: Fundamentals G5

Could someone please help me solve this problem? I got as far as converting 2.111g to moles (.020 mol) and finding the molarity (.8 mol.L-1). I don't know how to solve the rest. Thank you! (p. F58) G.5 A student prepared a solution of sodium carbonate by adding 2.111 g of the solid to a 250.0-mL vol...

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