Search found 61 matches

by Diana Sandoval 1K
Mon Mar 11, 2019 1:10 am
Forum: Administrative Questions and Class Announcements
Topic: Final
Replies: 18
Views: 371

Re: Final

I don't think there is an exact percentage but I believe anything that we covered after the midterm will be heavily on the final
by Diana Sandoval 1K
Mon Mar 11, 2019 1:08 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Final Exam
Replies: 23
Views: 236

Re: Final Exam

The final is cumulative therefore it will be on everything we learned this quarter.
by Diana Sandoval 1K
Mon Mar 11, 2019 1:07 am
Forum: Zero Order Reactions
Topic: Integration/Derivation
Replies: 3
Views: 96

Re: Integration/Derivation

I don't think so, I believe they come back to the equations given to us.
by Diana Sandoval 1K
Fri Mar 08, 2019 7:31 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Review
Replies: 3
Views: 100

Midterm Review

I wasn't able to go to class, did Lavelle finalize the rooms for the midterm review? Do you know if it's uploaded on his website.
by Diana Sandoval 1K
Fri Mar 08, 2019 8:30 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: k & K
Replies: 18
Views: 236

k & K

What is the difference between k in kinetics and K in equilibrium/ thermo?
by Diana Sandoval 1K
Thu Mar 07, 2019 12:46 am
Forum: Administrative Questions and Class Announcements
Topic: Homework for Week 9
Replies: 3
Views: 83

Homework for Week 9

Does anyone know if there is a specific topic we should do our homework on?
by Diana Sandoval 1K
Thu Mar 07, 2019 12:44 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Pt
Replies: 14
Views: 206

Re: Pt

You add it when there is no solid present or a solid that can't react. It is needed for your cell diagram.
by Diana Sandoval 1K
Thu Mar 07, 2019 12:42 am
Forum: Van't Hoff Equation
Topic: test 2
Replies: 7
Views: 198

Re: test 2

How do we know when we have to use that equation?
by Diana Sandoval 1K
Mon Mar 04, 2019 12:37 am
Forum: Balancing Redox Reactions
Topic: Ecell
Replies: 4
Views: 73

Re: Ecell

ran2000 wrote:You always flip the anode reaction. You can usually determine the anode reaction by choosing the reaction which has the lowest reduction potential (more negative and less positive)



How do you exactly figure out the lowest reduction potential?
by Diana Sandoval 1K
Mon Mar 04, 2019 12:36 am
Forum: General Rate Laws
Topic: Calculus Review
Replies: 8
Views: 102

Re: Calculus Review

I don't think we actually need them. From what I understood he only did it so you can see how he got the final equations.
by Diana Sandoval 1K
Mon Mar 04, 2019 12:34 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Finding n
Replies: 12
Views: 182

Re: Finding n

Yes, it is the amount of electrons added on both sides (of course they should be the same number).
by Diana Sandoval 1K
Mon Mar 04, 2019 12:31 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Pt(s)
Replies: 10
Views: 128

Re: Pt(s)

When there is no solid or metal present.
by Diana Sandoval 1K
Mon Mar 04, 2019 12:30 am
Forum: Balancing Redox Reactions
Topic: Cell diagrams
Replies: 8
Views: 130

Re: Cell diagrams

If there is no solid or metal added they include Pt or C in order for it to work.
by Diana Sandoval 1K
Mon Mar 04, 2019 12:27 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Delta G rules
Replies: 8
Views: 113

Re: Delta G rules

when delta G is positive it is nonspontaneous, when it is negative it is spontaneous and if it equals 0 it is at equilibrium
by Diana Sandoval 1K
Mon Mar 04, 2019 12:25 am
Forum: Student Social/Study Group
Topic: Final
Replies: 24
Views: 555

Re: Final

Lavelle usually announces it in class the week it starts.
by Diana Sandoval 1K
Mon Mar 04, 2019 12:24 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Does anyone know if test 2 will be curved?
Replies: 15
Views: 261

Re: Does anyone know if test 2 will be curved?

I believe it will not be since there is already basically a curve in Lavelle's grading scheme.
by Diana Sandoval 1K
Mon Mar 04, 2019 12:21 am
Forum: Balancing Redox Reactions
Topic: oxidizing agent and reducing agent
Replies: 15
Views: 170

Re: oxidizing agent and reducing agent

The reduced molecule is the oxidizing agent and the oxidized molecule is the reducing agent. They are inversely related.
by Diana Sandoval 1K
Tue Feb 26, 2019 2:07 pm
Forum: Administrative Questions and Class Announcements
Topic: Topics for Test2
Replies: 1
Views: 118

Topics for Test2

Up to what day of material will the test cover?
by Diana Sandoval 1K
Tue Feb 05, 2019 2:50 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Examples of Open Closed Isolated
Replies: 5
Views: 79

Re: Examples of Open Closed Isolated

An open system: an open water bottle
A closed system: a closed water bottle or pot
An isolated system: I'm not exactly sure but I believe a hydroflask can be an isolated system
by Diana Sandoval 1K
Tue Feb 05, 2019 2:46 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Midterm [ENDORSED]
Replies: 48
Views: 883

Re: Midterm [ENDORSED]

In my opinion it would be doing the homework and being able to understand the concepts. Also if you can go to the review sessions/ step-up sessions you should definitely do it because they're super helpful.
by Diana Sandoval 1K
Tue Feb 05, 2019 2:43 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ignoring x
Replies: 16
Views: 324

Re: ignoring x

When k is equal to or less than 10^3.
by Diana Sandoval 1K
Tue Feb 05, 2019 2:41 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Midterm
Replies: 12
Views: 190

Re: Midterm

Best way to study is by doing the homework. If you understand the homework and understand the concepts you should be good. Also if you can get access to past exams that will help.
by Diana Sandoval 1K
Sun Jan 27, 2019 10:17 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: ICE
Replies: 19
Views: 253

Re: ICE

concentration at equilibrium. You can figure that out by adding I and C.
by Diana Sandoval 1K
Sun Jan 27, 2019 10:15 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: What not to count
Replies: 9
Views: 135

Re: What not to count

This would be anything that is in the liquid or solid state, everything else is counted. Same goes when looking for K.
by Diana Sandoval 1K
Sun Jan 27, 2019 9:47 pm
Forum: Ideal Gases
Topic: Approximations for ICE
Replies: 20
Views: 219

Re: Approximations for ICE

When K is less than 10^-3
by Diana Sandoval 1K
Sun Jan 27, 2019 9:46 pm
Forum: Ideal Gases
Topic: kc vs kp
Replies: 16
Views: 266

Re: kc vs kp

You can use them interchangeably, difference is that Kc is used for concentration while Kp is used for pressure.
by Diana Sandoval 1K
Sun Jan 27, 2019 9:30 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy signs
Replies: 13
Views: 136

Re: Enthalpy signs

If it's positive it's endothermic and if it's negative it's exothermic.
by Diana Sandoval 1K
Thu Jan 10, 2019 7:46 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Reaction quotient [ENDORSED]
Replies: 4
Views: 65

Reaction quotient [ENDORSED]

I was doing the homework and I came across a problem where the reactants had both gases and liquids and the products were only solid. I am aware the formulas is [products]/[reactants] but in this case do we not use the reactants?
by Diana Sandoval 1K
Thu Jan 10, 2019 10:24 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Writing Equilibrium Expressions
Replies: 3
Views: 55

Writing Equilibrium Expressions

When writing the equilibrium expression does it matter whether we use brackets or parenthesis?
by Diana Sandoval 1K
Fri Dec 07, 2018 5:44 pm
Forum: Hybridization
Topic: Sigma and pi bonds
Replies: 4
Views: 98

Sigma and pi bonds

I’m not sure if I was the only one to hear this, or if I misunderstood; but did Dr. Lavelle say during lecture that we didn’t have to worry about the hybridization of pi bonds and sigma bonds?
by Diana Sandoval 1K
Fri Dec 07, 2018 1:25 am
Forum: General Science Questions
Topic: Final Exam
Replies: 5
Views: 233

Re: Final Exam

Max Kwon 1J wrote:It is cumulative, so it will probably be a question from each section/topic, but each question has multiple subsections (a,b,c, etc.)

How do you figure out when it has a higher boiling point?
by Diana Sandoval 1K
Fri Dec 07, 2018 1:04 am
Forum: Determining Molecular Shape (VSEPR)
Topic: H-bonds
Replies: 4
Views: 93

H-bonds

Are H-bonds polar or non-polar? How do you know, I need an explanation please.
by Diana Sandoval 1K
Fri Dec 07, 2018 12:59 am
Forum: Naming
Topic: Chloro v/s chlorido
Replies: 6
Views: 105

Re: Chloro v/s chlorido

They are both the same thing. I know chlorido is the new one but they will be accepting both.
by Diana Sandoval 1K
Fri Dec 07, 2018 12:58 am
Forum: General Science Questions
Topic: Final Exam
Replies: 5
Views: 233

Final Exam

Do you guys think that there will be a lot of melting point or boiling point questions on the exam? Or what do you think he'll ask?
by Diana Sandoval 1K
Fri Dec 07, 2018 12:56 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity
Replies: 1
Views: 27

Polarity

How do you determine whether the Lewis Structure is polar or nonpolar?
by Diana Sandoval 1K
Thu Dec 06, 2018 4:47 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent Structures
Replies: 12
Views: 175

Re: Bent Structures

Yes they are all polar because they have lone pairs that won't cancel out.
by Diana Sandoval 1K
Thu Dec 06, 2018 4:40 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Exam
Replies: 22
Views: 474

Re: Final Exam

I am assuming it is cumulative since he is basing it off of the syllabus.
by Diana Sandoval 1K
Thu Dec 06, 2018 4:36 pm
Forum: Student Social/Study Group
Topic: Studying
Replies: 7
Views: 300

Re: Studying

michellebui_3L wrote:Attend review sessions and going to office hours; doing the homework problems and modules.

Have you found all the review sessions helpful so far?
by Diana Sandoval 1K
Thu Dec 06, 2018 4:34 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarizing
Replies: 1
Views: 49

Polarizing

How do we determine which atom is the most polarizable and also their polarizing power?
by Diana Sandoval 1K
Thu Dec 06, 2018 4:30 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Intermolecular Forces
Replies: 1
Views: 54

Intermolecular Forces

How do we determine the intermolecular forces? Also how many are there and how do you tell the difference between them?
by Diana Sandoval 1K
Wed Nov 28, 2018 10:24 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Seesaw shape
Replies: 3
Views: 99

Seesaw shape

If I were to say that the bond angle is <90 and <180 is that correct? I know that it is between 90 and 120 but aren't 90 and 180 a bond angle as well?
by Diana Sandoval 1K
Mon Nov 19, 2018 12:00 am
Forum: Administrative Questions and Class Announcements
Topic: Workshops
Replies: 5
Views: 120

Re: Workshops

I'm pretty sure there will be some maybe up until Tuesday and possibly Wednesday.
by Diana Sandoval 1K
Sun Nov 18, 2018 11:57 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Pi bonds and sigma bonds
Replies: 5
Views: 73

Pi bonds and sigma bonds

What do each of the bonds determine when you draw them out?
by Diana Sandoval 1K
Wed Nov 14, 2018 10:21 pm
Forum: Lewis Structures
Topic: Formal Charge
Replies: 14
Views: 249

Re: Formal Charge

Like others have said, with formal charge your most stable Lewis structure is when they all have a FC of 0, but if that isn't possible you usually want your central atom to have a formal charge of 0 for it to be stable.
by Diana Sandoval 1K
Mon Nov 12, 2018 1:22 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 12
Views: 397

Re: Formal Charge

WilliamNguyen_4D wrote:Last test I just drew the most stable form of the lewis structure. I wrote all the calculations. If they ask for resonance then I think you should draw the resonance structures.

What's the difference between the Lewis structure and the resonance structure?
by Diana Sandoval 1K
Mon Nov 12, 2018 1:13 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Dipoles
Replies: 5
Views: 95

Dipoles

What are dipoles and how do we determine them?
by Diana Sandoval 1K
Mon Nov 12, 2018 1:01 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Energy of Bonds
Replies: 3
Views: 100

Energy of Bonds

How do we determine the energy of each bond? For example when we did the Lewis structure of Benzene in one of the double bonds we put it was 1.34 A and the single bond was 1.54 A.
by Diana Sandoval 1K
Sat Nov 03, 2018 5:46 pm
Forum: Student Social/Study Group
Topic: Sig Figs on Midterm
Replies: 13
Views: 471

Re: Sig Figs on Midterm

I think he will, it's always better to be safe than sorry, especially since we aren't taking our test in our discussion sections.
by Diana Sandoval 1K
Sat Nov 03, 2018 5:44 pm
Forum: Lewis Structures
Topic: Lewis Acids and Bases
Replies: 5
Views: 68

Re: Lewis Acids and Bases

From what I understood, a Lewis Acid takes electrons while a Lewis Base donates electrons. I know that for the midterm that's all we need to know.
by Diana Sandoval 1K
Sat Nov 03, 2018 5:41 pm
Forum: SI Units, Unit Conversions
Topic: Unit Conversions
Replies: 3
Views: 126

Unit Conversions

Does anyone know of an easy way to remember the conversions?
by Diana Sandoval 1K
Wed Oct 31, 2018 11:26 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Hw #2.51 6th edition
Replies: 1
Views: 71

Hw #2.51 6th edition

How many unpaired electrons are predicted for the ground-state configuration of each of the following atoms: a) Bi, b) Si, c) Ta, d) Ni?

How exactly do we figure this out?
by Diana Sandoval 1K
Sun Oct 28, 2018 9:13 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Ionization Energy
Replies: 2
Views: 53

Ionization Energy

Can someone please explain to me ionization energy?
by Diana Sandoval 1K
Sun Oct 21, 2018 9:25 pm
Forum: Properties of Electrons
Topic: ml
Replies: 5
Views: 143

Re: ml

You can definitely use a cursive l, that's what I use because I too confuse it with a 1. But for ml it determines the number of orbitals and the orientation within a subshell. Ml is dependent on l. So for example if l=2, ml would be -2,-1,0,1,2. I don't know if this is any help.
by Diana Sandoval 1K
Sun Oct 21, 2018 9:16 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Wave Functions
Replies: 4
Views: 74

Wave Functions

I'm confused as to how you determine if the subscript will be x, y, or z. We did an example in class that had the wave function of (3,1,0) and we got 3py but where did the 'y' come from?
by Diana Sandoval 1K
Sun Oct 14, 2018 5:04 pm
Forum: DeBroglie Equation
Topic: De Broglie Equation Example
Replies: 4
Views: 79

De Broglie Equation Example

On Friday's lecture we had the worked example: If you are driving a 1.50*10^3 kg car at 27.0 ms^-1, what is the Broglie wavelength of your car? Does your car have nay measurable wavelike properties? I understood how to get the Broglie wavelength but to the second part why was the answer no?
by Diana Sandoval 1K
Sun Oct 14, 2018 4:58 pm
Forum: Properties of Light
Topic: Speed of Light
Replies: 21
Views: 458

Re: Speed of Light

It's assumed to be a constant and from my knowledge I believe we will be given the constant.
by Diana Sandoval 1K
Thu Oct 11, 2018 1:20 am
Forum: Limiting Reactant Calculations
Topic: M5 [ENDORSED]
Replies: 1
Views: 160

M5 [ENDORSED]

Solve this exercise without using a calculator. The reaction 6 ClO21g2  2 BrF31l2 S 6 ClO2F1s2  Br21l2 is carried out with 12 mol ClO2 and 5 mol BrF3. (a) Identify the excess reactant.(b) Estimate how many moles of each product will be produced and how many moles of the excess reactant will remain...
by Diana Sandoval 1K
Sun Oct 07, 2018 1:52 pm
Forum: Properties of Light
Topic: Proving c=Δv
Replies: 1
Views: 43

Proving c=Δv

In Friday's lecture Dr. Lavelle gave us the reasoning behind why we could prove the equation. All I got was that the frequency doubles, but what happens after it doubles?
by Diana Sandoval 1K
Sun Oct 07, 2018 1:48 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E1
Replies: 3
Views: 83

E1

E.1 The field of nanotechnology offers some intriguing possibilities, such as the creation of fibers one atom wide. Suppose you were able to string together 1.00 mol Ag atoms, each of radius 144 pm, into one of these fibers by encapsulating them in carbon nanotubes (see Chapter 7). How long would th...
by Diana Sandoval 1K
Mon Oct 01, 2018 8:09 pm
Forum: Balancing Chemical Reactions
Topic: Law of Conservation of Mass [ENDORSED]
Replies: 7
Views: 167

Re: Law of Conservation of Mass [ENDORSED]

It's basically that mass can't be created nor destroyed. The matter may not change, there is just a rearrangements of atoms in a chemical reaction with the same mass in both the product and the reactants.

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