Search found 112 matches

by Rita Chen 1B
Tue Mar 10, 2020 1:15 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalysts
Replies: 1
Views: 20

Re: Catalysts

I think it can be added to any step, but only adding it to the slow step will really change the rate of the reaction. It will both affect the activation energy barrier, but only the one in the slow step will make a difference in the rate because that is the rate determining step.
by Rita Chen 1B
Tue Mar 10, 2020 1:13 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Calculation for pre-exponential factor A
Replies: 3
Views: 13

Re: Calculation for pre-exponential factor A

I think it would be given because he didn't really say we really needed to know it?
by Rita Chen 1B
Tue Mar 10, 2020 1:12 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: catalytic converter
Replies: 2
Views: 15

Re: catalytic converter

I think a catalytic converter is used to convert toxic cases like carbon monoxide to something less toxic and is used by coating an exhaust engine with a catalytic converter (I think like platinum?) Can someone confirm
by Rita Chen 1B
Tue Mar 10, 2020 1:09 pm
Forum: Administrative Questions and Class Announcements
Topic: Coronavirus Concern
Replies: 6
Views: 191

Re: Coronavirus Concern

I think only 7 classrooms are equipped with Bruincast, so not sure if that is an option. I think that the most liekly option is to use zoom and have online classes instead.
by Rita Chen 1B
Tue Mar 10, 2020 1:08 pm
Forum: Administrative Questions and Class Announcements
Topic: practice test
Replies: 2
Views: 79

Re: practice test

I think Lyndon posted a review called "endgame"
by Rita Chen 1B
Tue Mar 03, 2020 12:49 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6M.7
Replies: 5
Views: 61

Re: 6M.7

I had the same question, but I think it would be given to us. Maybe use the one with the solid substance?
by Rita Chen 1B
Tue Mar 03, 2020 12:47 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams
Replies: 3
Views: 40

Re: Cell Diagrams

I don’t think spectator ions are included
by Rita Chen 1B
Tue Mar 03, 2020 12:46 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: n
Replies: 4
Views: 28

Re: n

I think you find the amount of electrons transferred in the balanced reaction. So it is the number of electrons that eventually cancels out.
by Rita Chen 1B
Mon Mar 02, 2020 12:19 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6n.3
Replies: 1
Views: 42

6n.3

Predict the potential of each of the following cells:
(a) Pt(s) | H2(g, 1.0 bar) | HCl(aq, 0.075 mol?L21) || HCl(aq, 1.0 mol?L21) | H2(g, 1.0 bar) | Pt(s).
How do you find the half reactions for this problem?
by Rita Chen 1B
Sat Feb 29, 2020 8:59 pm
Forum: Balancing Redox Reactions
Topic: Difference between balancing Basic and Acidic
Replies: 3
Views: 32

Re: Difference between balancing Basic and Acidic

Is the only difference between balancing basic and acidic reactions whether you add H+ or OH? Also, do you guys have any tips for balancing? Hi Rita, From what I understand, that is the most important difference between the two! I spoke with Matthew Tran, a UA, regarding balancing tips. I thought h...
by Rita Chen 1B
Sat Feb 29, 2020 3:40 pm
Forum: Balancing Redox Reactions
Topic: Homework 6K.3
Replies: 2
Views: 46

Re: Homework 6K.3

Does this mean that during the same reaction, it can be reduced and oxidized (some will get reduced and some will get oxidized?)
by Rita Chen 1B
Sat Feb 29, 2020 3:39 pm
Forum: Balancing Redox Reactions
Topic: Difference between balancing Basic and Acidic
Replies: 3
Views: 32

Difference between balancing Basic and Acidic

Is the only difference between balancing basic and acidic reactions whether you add H+ or OH?

Also, do you guys have any tips for balancing?
by Rita Chen 1B
Sat Feb 29, 2020 3:35 pm
Forum: Balancing Redox Reactions
Topic: Redox Reactions
Replies: 2
Views: 35

Re: Redox Reactions

by Rita Chen 1B
Sat Feb 29, 2020 3:06 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Very first learning objective on 2nd page of thermodynamics
Replies: 2
Views: 46

Re: Very first learning objective on 2nd page of thermodynamics

Maybe it's talking about delta G, which uses RT lnQ, which may depend on pressures?
by Rita Chen 1B
Sat Feb 29, 2020 3:02 pm
Forum: General Rate Laws
Topic: Unique Rate Applications
Replies: 2
Views: 46

Re: Unique Rate Applications

I think we can use it to determine the concentration of reactants at a certain point in reaction.
by Rita Chen 1B
Sat Feb 22, 2020 1:43 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: more than 2 cells
Replies: 3
Views: 30

more than 2 cells

Is it possible to have more than 2 galvanic cells together? How would that work?
by Rita Chen 1B
Sat Feb 22, 2020 1:39 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Cell Potential
Replies: 2
Views: 32

Re: Cell Potential

I was wondering the same thing. I know that if the reaction is spontaneous and delta G is negative, the E must be positive because of Nernst equation. But I am not sure for if E cell < Estandard Cell.
by Rita Chen 1B
Sat Feb 22, 2020 1:36 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Concentration effect on E
Replies: 4
Views: 47

Re: Concentration effect on E

I think it depends on the reaction? I could be wrong, but in Dr. Lavelle's example today, the increasing in Mn concentration, caused the forward reaction to be favored, making E increase since the E standard was positive. I think it depends what you increase in concentration.
by Rita Chen 1B
Sat Feb 22, 2020 1:34 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Potential difference
Replies: 3
Views: 51

Re: Potential difference

I think it just means that the potential difference is the amount of work energy needed to be able to take one electric charge from one place to another.
by Rita Chen 1B
Sat Feb 22, 2020 1:31 am
Forum: Balancing Redox Reactions
Topic: Homework 6K.3
Replies: 2
Views: 46

Homework 6K.3

We are supposed to find the oxidizing agent/reducing agent of: Cl2(g) --> HClO (aq) +Cl2 (g)

My question is, conceptually, how can something be both the oxidizing and reducing agent?
by Rita Chen 1B
Wed Feb 12, 2020 11:48 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Difference between equations
Replies: 2
Views: 28

Difference between equations

When would I use nRln(V2/V1) and when would i use nCpln(T2/T1)? If the pressure is constant and the volume changes, the temperature changes too, so shouldn't both equations be able to be used?
by Rita Chen 1B
Wed Feb 12, 2020 9:15 am
Forum: Calculating Work of Expansion
Topic: Lyndon Review Questions #6
Replies: 2
Views: 58

Re: Lyndon Review Questions #6

In the question, how would you approach it? What would you try to solve for first?
by Rita Chen 1B
Wed Feb 12, 2020 9:11 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: P1/P2
Replies: 10
Views: 123

P1/P2

Why is it P1/P2 for delta S and V2/V1?
by Rita Chen 1B
Wed Feb 12, 2020 9:10 am
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Reversible vs Irreversible
Replies: 5
Views: 112

Reversible vs Irreversible

Is the only time we need to differentiate between reversible and irreversible when calculating work with: eversible: - nRT ln (v1/v2) and -Pext ΔV and when calculating delta S?
by Rita Chen 1B
Wed Feb 12, 2020 9:07 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Negative work
Replies: 14
Views: 186

Negative work

When is work negative?
by Rita Chen 1B
Wed Feb 12, 2020 9:06 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: using the first law
Replies: 3
Views: 60

using the first law

When will I need to factor in both q and w? I’m a little confused.
by Rita Chen 1B
Sun Feb 09, 2020 1:13 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy Surroundings
Replies: 4
Views: 51

Re: Entropy Surroundings

Does increasing the temperature always change the entropy of the surroundings?
by Rita Chen 1B
Sun Feb 09, 2020 1:11 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Entropy Changes for Phase Changes
Replies: 1
Views: 21

Entropy Changes for Phase Changes

In Dr. Lavelle's lecture, he stated that phase changes have entropy changes. Can someone explain why?
by Rita Chen 1B
Sun Feb 09, 2020 1:08 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Gas Expansion
Replies: 3
Views: 43

Gas Expansion

In Dr. Lavelle's lecture, can someone explain why if delta U is 0, why the gas expands?
by Rita Chen 1B
Sun Feb 09, 2020 1:02 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Spontaneous vs Favorable
Replies: 8
Views: 72

Spontaneous vs Favorable

Can someone explain spontaneous vs favorable more? I feel like it's often used very interchangeably.
by Rita Chen 1B
Sun Feb 09, 2020 12:55 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Finding whether exothermic or Endothermic
Replies: 4
Views: 46

Finding whether exothermic or Endothermic

Are we going to be able to know if a reaction is exothermic or endothermic if the delta H isn't given? If so, how?
by Rita Chen 1B
Thu Jan 30, 2020 11:44 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Standard Form of molecule
Replies: 6
Views: 65

Re: Standard Form of molecule

How about at bar because they are very similar?
by Rita Chen 1B
Thu Jan 30, 2020 11:43 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 8
Views: 89

Midterm

What will the midterm cover?
by Rita Chen 1B
Thu Jan 30, 2020 11:42 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpies of Formation
Replies: 4
Views: 43

Enthalpies of Formation

Will the enthalpies of formation always be given to us if we need it on the test?
by Rita Chen 1B
Thu Jan 30, 2020 11:41 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated vs Closed [ENDORSED]
Replies: 34
Views: 415

Isolated vs Closed [ENDORSED]

How can we tell which one is which? Like does an insulated water bottle count as isolated?
by Rita Chen 1B
Thu Jan 30, 2020 11:39 pm
Forum: Calculating Work of Expansion
Topic: ∆H and ∆U
Replies: 3
Views: 41

∆H and ∆U

Can someone simply explain ∆H and ∆U for me?
by Rita Chen 1B
Mon Jan 20, 2020 11:28 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6D.15
Replies: 2
Views: 34

6D.15

How do we calculate the pH of 0.055 M AlCl3 (aq)?
by Rita Chen 1B
Mon Jan 20, 2020 9:36 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Homework 6c.1
Replies: 1
Views: 27

Homework 6c.1

Write (a) the chemical equation for the proton transfer equilibrium in water and the corresponding expression for Ka and (b) the chemical equation for the proton transfer equilibrium of the conjugate base and the corresponding expression for Kb for each of the following weak acids: i) HClO2 ii) HCN ...
by Rita Chen 1B
Mon Jan 20, 2020 3:52 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Kc vs K
Replies: 7
Views: 50

Re: Kc vs K

But what if the Kc and K are different? Will we usually be given K or Kc depending on which one we use?
by Rita Chen 1B
Mon Jan 20, 2020 3:50 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Converting K to Kc
Replies: 4
Views: 47

Converting K to Kc

Do we need to know how to convert it? If so, how?
by Rita Chen 1B
Mon Jan 20, 2020 3:49 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Kc vs K
Replies: 7
Views: 50

Re: Kc vs K

So when do we use K and when do we use Kc? When will we need to convert and how do we convert it?
by Rita Chen 1B
Mon Jan 20, 2020 3:41 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Kc vs K
Replies: 7
Views: 50

Kc vs K

Whats the difference between Kc and K?
by Rita Chen 1B
Thu Jan 16, 2020 12:41 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Quadratic
Replies: 6
Views: 51

Re: Quadratic

Definitely try to memorize it. I think doing more practice problems really helps you with that!
by Rita Chen 1B
Thu Jan 16, 2020 12:40 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6C.13
Replies: 2
Views: 28

Re: 6C.13

I think that the stronger the acid or base, the weaker the conjugate base or acid. So I think you are supposed to use the pKa to determine how strong it is and then compare its conjugate base or acid to the rest.
by Rita Chen 1B
Thu Jan 16, 2020 12:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Questions 6C5,6c9
Replies: 1
Views: 28

Re: Questions 6C5,6c9

6C.5 Write the chemical formula for the conjugate base of formic acid, HCOOH and calculate its pKb from the pKa of formic acid (see Table 6C.1).


6C.9 Use data from Tables 6C.1 and 6C.2 to place the following
bases in order of increasing strength: F2, NH , CH CO 2, C H N
(pyridine).
by Rita Chen 1B
Tue Jan 14, 2020 1:29 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Change on Same Side
Replies: 6
Views: 55

Change on Same Side

In something like N2 + 3H2 —> 2NH3, if we increased N2, does it affect H2 as well?
by Rita Chen 1B
Tue Jan 14, 2020 1:27 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Why Ignore Liquid or Solid Volume When Calculating K
Replies: 7
Views: 50

Re: Why Ignore Liquid or Solid Volume When Calculating K

I think one thing is that the activity of a solid or liquid is equal to 1, so it doesn’t affect the K constant. Also in terms of solids, it is not dissolved, so would not have a concentration and I think something similar can be said with liquids as well.
by Rita Chen 1B
Tue Jan 07, 2020 12:06 pm
Forum: Ideal Gases
Topic: Dynamic Equilibrium
Replies: 10
Views: 88

Re: Dynamic Equilibrium

How do we know when something is in dynamic equilibrium?
by Rita Chen 1B
Tue Jan 07, 2020 12:04 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Very Large K
Replies: 12
Views: 126

Re: Very Large K

At what point should we put the single arrow and not the double arrow?
by Rita Chen 1B
Tue Jan 07, 2020 12:03 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Keq vs Kc
Replies: 6
Views: 149

Keq vs Kc

Is Keq the same as Kc?
When do we use which?
by Rita Chen 1B
Tue Jan 07, 2020 12:02 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Pressure's Effect on Equilibrium
Replies: 6
Views: 91

Re: Pressure's Effect on Equilibrium

I think simply it’s because the inside doesn’t change so the products and reactants don’t change so the K is still the same.
by Rita Chen 1B
Tue Jan 07, 2020 11:59 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Effects of Concentration on Equilibrium
Replies: 6
Views: 64

Re: Effects of Concentration on Equilibrium

I believe so. I think it’s also important to note that reactions are continually reacting, so if something is changed, it will want to go back to its original equilibrium state.
by Rita Chen 1B
Sat Dec 07, 2019 8:35 pm
Forum: Administrative Questions and Class Announcements
Topic: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]
Replies: 111
Views: 4607

Re: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]

Wait how do you know whether a coordination compound is a chelate? For example, how do you know that [Ni(NH3)2O2]Br2 is not a chelate?
by Rita Chen 1B
Sat Dec 07, 2019 3:34 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate
Replies: 1
Views: 44

Polydentate

How would ew determine that HN(CH2Ch2NH2)2 is polydentate? Do we need to draw it out? If so, how do you know how ot draw it?
by Rita Chen 1B
Fri Dec 06, 2019 4:26 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand Names sheet
Replies: 1
Views: 44

Ligand Names sheet

Will we be given the ligand names in coordination compounds sheet that was sent out?
by Rita Chen 1B
Fri Dec 06, 2019 2:34 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: free radicals
Replies: 1
Views: 98

free radicals

Do free radicals count as electron density?
by Rita Chen 1B
Thu Dec 05, 2019 1:05 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Acid/Base Trends
Replies: 6
Views: 88

Re: Acid/Base Trends

I think this is because as you go down a group for binary acids, you are looking at the strength and length of the HA bond, not the polarity, so the weaker the HA bond, the stronger the acid.
by Rita Chen 1B
Wed Dec 04, 2019 7:10 pm
Forum: Hybridization
Topic: hybrid orbitals
Replies: 2
Views: 45

Re: hybrid orbitals

I feel like we wouldn’t need to know that since its pretty complicated (ish)
by Rita Chen 1B
Wed Dec 04, 2019 7:08 pm
Forum: Bond Lengths & Energies
Topic: conjugation
Replies: 3
Views: 108

Re: conjugation

Could someone explain conjugation in general and when we need it?
by Rita Chen 1B
Wed Dec 04, 2019 7:07 pm
Forum: Naming
Topic: Naming with Latin names
Replies: 1
Views: 41

Naming with Latin names

Which latin names do we need to know? for example, will we be given that Copper would be cuprate?
by Rita Chen 1B
Wed Dec 04, 2019 7:06 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Need to Know About Chelating
Replies: 1
Views: 39

Re: Need to Know About Chelating

I would think that you would just need to know what counts, so like knowing that bidentate would be chelating, or when it counts as chelating (2 or more bonds to a metal ion)
by Rita Chen 1B
Wed Dec 04, 2019 7:04 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: - Dentate
Replies: 1
Views: 25

Re: - Dentate

I think this refers to how many bonds the ligands can make to an ion. So like for example, if you had C2H4, it would be bidentate, because it could bind to something like Zn2+.
by Rita Chen 1B
Mon Dec 02, 2019 9:08 pm
Forum: Lewis Acids & Bases
Topic: Problem J.9
Replies: 4
Views: 62

Problem J.9

Identify the salt that is produced from the acid-base neutralization reaction between potassium hydroxide and acetic acid.

How would I do this? I know it is supposed to produce water but the salt doesn't look quite right if I have more than 1 carbon
by Rita Chen 1B
Tue Nov 26, 2019 8:22 am
Forum: Hybridization
Topic: How to write
Replies: 3
Views: 42

How to write

How do I know how to write these hybridization? How does it relate to shape?
by Rita Chen 1B
Tue Nov 26, 2019 8:22 am
Forum: Dipole Moments
Topic: Intermolecular force
Replies: 5
Views: 358

Intermolecular force

Would it be okay to say that even though it is an intermolecular force, the stronger, the harder the bonds are to break?
by Rita Chen 1B
Tue Nov 26, 2019 8:19 am
Forum: Sigma & Pi Bonds
Topic: Strength of the Bonds
Replies: 2
Views: 37

Strength of the Bonds

Will pi bonds be stronger than sigma bonds? Or is there a way to tell whether there is a strength difference?
by Rita Chen 1B
Tue Nov 26, 2019 8:18 am
Forum: Sigma & Pi Bonds
Topic: Promotion
Replies: 5
Views: 140

Re: Promotion

So does promotion just refer to having an electron be at a higher electron state/bringing it to a higher orbital?
by Rita Chen 1B
Tue Nov 26, 2019 8:16 am
Forum: Naming
Topic: H2O vs OH2
Replies: 3
Views: 42

Re: H2O vs OH2

I think you write OH2 to emphasize that it is not bound to the hydrogen, but to the metal of the ligand. I think either is fine, but if you wanted to emphasize the coordination compound it would be OH2.
by Rita Chen 1B
Mon Nov 18, 2019 9:50 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: CS2
Replies: 1
Views: 26

CS2

Is CS2 non-polar because of symmetry?
by Rita Chen 1B
Mon Nov 18, 2019 9:35 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: (CH3)2Be
Replies: 1
Views: 29

(CH3)2Be

How do I know which one is the central atom? If Be was the central atom, it would be linear right? But the solutions said tetrahedral about the carbon atom so I’m not sure which one I would put.
by Rita Chen 1B
Mon Nov 18, 2019 8:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 3
Views: 45

Lone Pairs

Why do lone pairs take up more space?
by Rita Chen 1B
Mon Nov 18, 2019 4:34 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shapes
Replies: 1
Views: 21

Molecular Shapes

Do we need to know all the shapes or just the ones that he went over in class? I am looking at some of them and we haven't really discussed some of these before. Is it just his lectures, lectures + book, or lectures + book + everything else?
by Rita Chen 1B
Mon Nov 18, 2019 4:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pair placement
Replies: 2
Views: 27

Re: Lone pair placement

I think that you place it where it will have the largest distance so that it will stabilize the structure. Not sure if that is completely correct, I am confused a little too.
by Rita Chen 1B
Mon Nov 18, 2019 12:24 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: CH2Cl2
Replies: 1
Views: 21

CH2Cl2

Why is CH2Cl2 going to have dipole-dipole interactions? Does the symmetry not matter?
by Rita Chen 1B
Mon Nov 18, 2019 12:17 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: H2SeO4
Replies: 1
Views: 31

H2SeO4

Where is the dipole-dipole interaction in this? Is it with the O-H? Can someone explain to me what the dipole-dipole interaction really is because I only really know of the interaction between water molecules as being dipole-dipole, so how can one molecule have dipole-dipole interactions?
by Rita Chen 1B
Tue Nov 12, 2019 12:35 pm
Forum: Octet Exceptions
Topic: Antioxidants
Replies: 9
Views: 228

Re: Antioxidants

What happens to the antioxidants afterward?
by Rita Chen 1B
Tue Nov 12, 2019 12:34 pm
Forum: Empirical & Molecular Formulas
Topic: Midterm question 1
Replies: 6
Views: 216

Re: Midterm question 1

Do you guys think if I wrote it in the wrong order, it would be ok? Or would it be partial credit.
by Rita Chen 1B
Tue Nov 12, 2019 12:33 pm
Forum: Ionic & Covalent Bonds
Topic: Ionization of Nitrogen vs Oxygen
Replies: 11
Views: 139

Re: Ionization of Nitrogen vs Oxygen

I was wondering whether this goes for the ones below as well. I was a little confused whether these exceptions are for all of the ones that follow the same atom trend.
by Rita Chen 1B
Tue Nov 12, 2019 12:32 pm
Forum: Administrative Questions and Class Announcements
Topic: test 2
Replies: 1
Views: 38

test 2

Does anyone know what Test 2 will be on? Will it be a cumulative kind of test, or just on the new sections?
by Rita Chen 1B
Tue Nov 12, 2019 12:30 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 7 Homework
Replies: 7
Views: 88

Re: Week 7 Homework

I think that week 7 homework is on anything that we learned during discussion or if there is a test, whatever it is like a test. But honestly, I think that if you do the questions for the material covered in that week, it would be okay.
by Rita Chen 1B
Mon Nov 04, 2019 2:26 pm
Forum: Lewis Structures
Topic: When to use brackets
Replies: 2
Views: 51

When to use brackets

When do we need to use brackets? And also for ionic compounds, will we always write them separately with brackets, adding the electron on the anion?
by Rita Chen 1B
Mon Nov 04, 2019 2:25 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect Word Problems
Replies: 1
Views: 54

Re: Photoelectric Effect Word Problems

If it is asking about the threshold, it is usually the total kinetic energy of the incoming light minus the energy of the electron emitted, while kinetic energy it could be talking about the kinetic energy of the electron emitted, or the photon itself. If it is talking about the source, usually it w...
by Rita Chen 1B
Mon Nov 04, 2019 2:20 pm
Forum: General Science Questions
Topic: Midterm
Replies: 12
Views: 227

Re: Midterm

For the midterm, do you know what will be provided in terms of sheets? Like will we be given electronegativity values? Or bond lengths?
by Rita Chen 1B
Mon Nov 04, 2019 2:18 pm
Forum: General Science Questions
Topic: Chem 14 B and Chem 14 BL
Replies: 1
Views: 66

Chem 14 B and Chem 14 BL

Can someone please explain the two classes for chem 14B and chem 14BL? When should we be taking it? I heard that you can take it at the same time. but do most people take it at the same time?
by Rita Chen 1B
Mon Nov 04, 2019 2:16 pm
Forum: Ionic & Covalent Bonds
Topic: Polyatomic Ions
Replies: 2
Views: 50

Polyatomic Ions

Which polyatomic ions will we need to know? And do we need to know naming and to what extent?
by Rita Chen 1B
Mon Oct 28, 2019 1:30 pm
Forum: Ionic & Covalent Bonds
Topic: Ground-State electron configuration
Replies: 3
Views: 41

Ground-State electron configuration

Can someone please explain to me what it means by ground-state? What is the difference between ground state and excited state?
by Rita Chen 1B
Mon Oct 28, 2019 1:28 pm
Forum: Ionic & Covalent Bonds
Topic: likely charge of atoms
Replies: 3
Views: 32

Re: likely charge of atoms

I think Ga would likely be 3+ because it has 3 valence electrons.
by Rita Chen 1B
Mon Oct 28, 2019 1:26 pm
Forum: Ionic & Covalent Bonds
Topic: Electron Configuration: 2A.5B
Replies: 1
Views: 24

Electron Configuration: 2A.5B

Can someone please explain to me how to do part B of 2A.5? I don’t get how to incorporate the F-block.

The question is Give the ground-state electron configuration expected for Bi3+.
by Rita Chen 1B
Mon Oct 28, 2019 1:24 pm
Forum: Bond Lengths & Energies
Topic: Electron-Electron Repulsion
Replies: 2
Views: 32

Electron-Electron Repulsion

I was wondering if someone could explain to me more about the electron-electron repulsion that makes the atomic radii bigger (I think). Does it matter that much and which one has a bigger impact, the pull from the protons or that repulsion?
by Rita Chen 1B
Mon Oct 28, 2019 1:10 pm
Forum: General Science Questions
Topic: Midterm
Replies: 1
Views: 37

Midterm

Because class was cancelled, and there was materiel that we were supposed to go through today, does that mean there will be less material on the midterm or will he just speed up the class time learning?
by Rita Chen 1B
Thu Oct 24, 2019 12:18 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Noble Gas Configuration
Replies: 10
Views: 101

Noble Gas Configuration

Does anyone know when we need to use noble gas configuration (simplified) rather than the traditional long electron configuration?
by Rita Chen 1B
Thu Oct 24, 2019 12:16 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 2nd electron
Replies: 4
Views: 41

Re: 2nd electron

You can think of it like you are making an atom that is already more positive than it should be, even more positive. It will be harder because the atom wants to keep that electron and you are taking it away from its stable form and the form in which it has no net positive or negative charge.
by Rita Chen 1B
Thu Oct 24, 2019 12:15 pm
Forum: Trends in The Periodic Table
Topic: Trends
Replies: 5
Views: 65

Re: Trends

Knowing the ionization energy and electron affinity (electronegativity) is probably the most important. It may also help to know the trends in the size of these atoms because it can really help you determine the other two. The other two are important because they can help you determine what will be ...
by Rita Chen 1B
Thu Oct 24, 2019 12:13 pm
Forum: Ionic & Covalent Bonds
Topic: strength of bonds
Replies: 11
Views: 265

Re: strength of bonds

The strength of a bond is affected by the charge and distance for ionic bonds. The strength of a bond is affected by the electronegativity differences and the bond length. Generally, double bonds are stronger than single bonds and triple bonds are stronger than double bonds. We will probably need to...
by Rita Chen 1B
Thu Oct 24, 2019 12:10 pm
Forum: *Particle in a Box
Topic: TEST 2
Replies: 13
Views: 364

Re: TEST 2

Test 2 will be during your discussion session from week 8 starting from November 19th!
by Rita Chen 1B
Sat Oct 19, 2019 9:37 pm
Forum: General Science Questions
Topic: Tests
Replies: 9
Views: 118

Re: Tests

I think if there is one they don’t expect you to know, they will put it on the sheet. The ones you should know are the ones we went over in class though. Any other conversions that are semi-difficult should be put on the sheet.
by Rita Chen 1B
Sat Oct 19, 2019 9:35 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration
Replies: 1
Views: 25

Electron Configuration

Can someone please clarify what Dr. Lavelle said about putting 3d in front of 4s? Thank you!
by Rita Chen 1B
Sat Oct 19, 2019 9:33 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Letter Names
Replies: 4
Views: 66

Re: Letter Names

The letters themselves represent a word. S represents sharp, p represents principal, f represents fundamental and d represents diffuse.Thi sis from the spectra of the alkali metals.

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