Search found 64 matches

by Melissa Villanueva1K
Sat Mar 16, 2019 12:42 pm
Forum: Student Social/Study Group
Topic: Solutions for Tests 1 and 2
Replies: 7
Views: 364

Solutions for Tests 1 and 2

Does anyone know if the solutions for Test 1 and 2 are posted anywhere? Or are they available somehow? Thanks!
by Melissa Villanueva1K
Sat Mar 16, 2019 12:25 pm
Forum: Zero Order Reactions
Topic: Graphs
Replies: 3
Views: 185

Graphs

Is there a possibility that there will be graphs given or we will have to draw graphs in accordance to the order of the reaction? Thanks!
by Melissa Villanueva1K
Sat Mar 16, 2019 12:22 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalysts
Replies: 2
Views: 44

Catalysts

How will catalysts be incorporated into a problem? Thanks!
by Melissa Villanueva1K
Sat Mar 16, 2019 12:20 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Finding k
Replies: 1
Views: 37

Finding k

How do we determine which trial we should use when looking for k? Thanks!
by Melissa Villanueva1K
Fri Mar 15, 2019 10:33 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: k & K
Replies: 18
Views: 429

Re: k & K

Will there be a clear indication of 'k' and 'K' on the final? Such as bolding one over the other. Thanks.
by Melissa Villanueva1K
Fri Mar 15, 2019 10:16 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Lecture Cell Diagram Example
Replies: 3
Views: 64

Re: Lecture Cell Diagram Example

Thanks so much for the clarification! It helped a lot!
by Melissa Villanueva1K
Fri Mar 15, 2019 3:32 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Types of Molecularity
Replies: 4
Views: 283

Types of Molecularity

What are the different types of molecularity and what do they mean?
by Melissa Villanueva1K
Fri Mar 15, 2019 3:31 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Molecularity
Replies: 3
Views: 180

Molecularity

How does one determine the molecularity of a reaction?
by Melissa Villanueva1K
Fri Mar 15, 2019 3:27 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Lecture Cell Diagram Example
Replies: 3
Views: 64

Lecture Cell Diagram Example

Can someone explain the cell diagram example that was shown today in lecture? The example was "What's wrong with the cell diagram?
Ag(s)|AgBr(s)||Br-(aq)|Br2(aq) . I know that Professor Lavelle mentioned something about the solids being in different phases, what does that mean? Thanks!
by Melissa Villanueva1K
Thu Mar 14, 2019 5:57 pm
Forum: Student Social/Study Group
Topic: Studying for the Final
Replies: 25
Views: 784

Re: Studying for the Final

Practice problems, homework and also looking over the pasts tests/midterm.
by Melissa Villanueva1K
Thu Mar 14, 2019 5:46 pm
Forum: Zero Order Reactions
Topic: Order distinction
Replies: 9
Views: 265

Re: Order distinction

You look at the exponent of the reactant in the rate law. With multiple reactants you add up the exponents.
by Melissa Villanueva1K
Thu Mar 14, 2019 5:39 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius Equation.
Replies: 4
Views: 77

Re: Arrhenius Equation.

The Arrhenius equation can be used to determine the effect of a change of temperature on the rate constant, and thus on the rate of the reaction. The equation being k=Ae^-(Ea/RT)
by Melissa Villanueva1K
Thu Mar 14, 2019 5:28 pm
Forum: General Rate Laws
Topic: when to use what
Replies: 1
Views: 52

when to use what

How do we know when to use unique rate, instantaneous rate or average rate? What are somethings that would be given in the problem? Some key indicators. Thanks!
by Melissa Villanueva1K
Thu Mar 14, 2019 5:25 pm
Forum: General Rate Laws
Topic: Unique, Instantaneous, and Average Rate
Replies: 1
Views: 53

Unique, Instantaneous, and Average Rate

What is the difference between unique rate, instantaneous rate and average rate?
by Melissa Villanueva1K
Mon Mar 04, 2019 12:06 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Endergonic vs. Endothermic
Replies: 6
Views: 289

Endergonic vs. Endothermic

Can someone explain the difference between endergonic and endothermic? Thanks!
by Melissa Villanueva1K
Mon Mar 04, 2019 12:01 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Delta G rules
Replies: 8
Views: 147

Delta G rules

Can someone briefly explain the rules that apply to Delta G when it is less than, greater than, or equal to zero? (i.e its spontaneity)
by Melissa Villanueva1K
Sun Mar 03, 2019 11:54 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Pt(s)
Replies: 10
Views: 179

Re: Pt(s)

Can it be written at the beginning of a cell diagram or does it always have to be in the end?
by Melissa Villanueva1K
Sun Mar 03, 2019 11:52 pm
Forum: Van't Hoff Equation
Topic: Sample problem
Replies: 2
Views: 209

Sample problem

Can someone direct me to a practice problem that uses the Van't Hoff equation? Or can explain its use in a problem? Thanks!
by Melissa Villanueva1K
Thu Feb 21, 2019 11:29 pm
Forum: Balancing Redox Reactions
Topic: Balancing / Skeletal Equations
Replies: 4
Views: 103

Balancing / Skeletal Equations

Why is it that when we are balancing skeletal equations, we usually add an H+ or H20 to the chemical equation? Thanks!
by Melissa Villanueva1K
Thu Feb 21, 2019 11:25 pm
Forum: Balancing Redox Reactions
Topic: Balancing Redox Rxns
Replies: 2
Views: 66

Balancing Redox Rxns

What are the steps I should take when approaching and balancing a redox reaction?
by Melissa Villanueva1K
Thu Feb 21, 2019 11:23 pm
Forum: Van't Hoff Equation
Topic: Overview
Replies: 8
Views: 318

Overview

Can someone please give me a brief explanation or overview of the Van't Hoff Equation? Thanks!
by Melissa Villanueva1K
Thu Feb 21, 2019 11:22 pm
Forum: Student Social/Study Group
Topic: Outline
Replies: 1
Views: 64

Outline

Which outline are we currently in, outline 4 or 5? Thanks!
by Melissa Villanueva1K
Thu Feb 21, 2019 11:21 pm
Forum: Student Social/Study Group
Topic: Midterm Results
Replies: 4
Views: 131

Midterm Results

Does anyone know when we'll get our midterms back?
by Melissa Villanueva1K
Wed Feb 06, 2019 11:38 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Midterm [ENDORSED]
Replies: 49
Views: 1407

Re: Midterm [ENDORSED]

Doing homework problems, attending any step up sessions, and going to the review sessions that will be happening throughout the week. Also there are practice problems that may be posted.
by Melissa Villanueva1K
Wed Feb 06, 2019 11:35 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Degeneracy
Replies: 2
Views: 49

Re: Degeneracy

Entropy is the probability that the system will be in one state. Degeneracy is the number of ways you can reach that energy state. Degeneracy and entropy are directly related. Meaning that the higher entropy, the higher the degeneracy.
by Melissa Villanueva1K
Wed Feb 06, 2019 11:27 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 'C' constant
Replies: 2
Views: 58

'C' constant

In the equation ( ΔS = nC ln T2/T1) for calculating entropy changes because of a change in temperature, what is 'C'? Is it a constant or is it something that is given?
by Melissa Villanueva1K
Wed Feb 06, 2019 11:23 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Negative q
Replies: 7
Views: 145

Negative q

When do you use a negative value for q when calculating entropy?
by Melissa Villanueva1K
Fri Jan 25, 2019 12:19 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Ka
Replies: 6
Views: 135

Ka

For 12.79 I look for the Ka value for H2SO4 but on table 12.10 all it says is 'strong' for Ka1, what does that mean? Could someone please explain, thanks!
by Melissa Villanueva1K
Thu Jan 24, 2019 9:45 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Acids and Bases (weak or strong)
Replies: 3
Views: 87

Acids and Bases (weak or strong)

How do we determine whether an acid or base is strong or weak? Thanks!
by Melissa Villanueva1K
Thu Jan 24, 2019 9:26 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Test 1
Replies: 1
Views: 51

Test 1

Will percentage protonation be on test 1?
by Melissa Villanueva1K
Thu Jan 24, 2019 9:23 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Forming hydronium or hydroxide
Replies: 1
Views: 49

Forming hydronium or hydroxide

When we are writing out a chemical equation, how do we know whether the molecule forms hydronium or hydroxide when added in water? Thanks!
by Melissa Villanueva1K
Sun Jan 13, 2019 10:47 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's Principle
Replies: 7
Views: 93

Le Chatelier's Principle

Could someone briefly explain Le Chatelier's Principle or perhaps point me in the direction of a problem that applies the principle? Thanks!
by Melissa Villanueva1K
Sun Jan 13, 2019 10:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Calculations
Replies: 2
Views: 87

Re: Calculations

Essentially K and Kc are in a sense asking for the same thing, which has to do with concentrations. Kc is in terms of molar concentrations. While Kp is the partial pressures of the gases included in the system. Q can be thrown into this category as well. When the problem is asking for K and you see ...
by Melissa Villanueva1K
Fri Dec 07, 2018 7:21 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 5
Views: 143

Re: Lone Pairs

Only the lone pairs on the central atom can have an affect in the geometry of the molecule. Such as the push or the pull of the surrounding atoms.
by Melissa Villanueva1K
Fri Dec 07, 2018 7:18 pm
Forum: Student Social/Study Group
Topic: Studying for tests/midterm
Replies: 18
Views: 1217

Re: Studying for tests/midterm

Doing homework problems and maybe looking for past exams and just practice doing those as well. All in all, it's just practice.
by Melissa Villanueva1K
Fri Dec 07, 2018 7:14 pm
Forum: Student Social/Study Group
Topic: Worksheets/Practice
Replies: 1
Views: 268

Worksheets/Practice

Does anyone know of good practice problems or past final exams from Dr.Lavelle? Thanks.
by Melissa Villanueva1K
Fri Dec 07, 2018 7:11 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Calculate pH or pOH [ENDORSED]
Replies: 2
Views: 81

Calculate pH or pOH [ENDORSED]

How do you calculate the pH or pOH?
by Melissa Villanueva1K
Wed Dec 05, 2018 6:36 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Final Exam
Replies: 7
Views: 167

Final Exam

Will we need to know how to calculate the pH or pOH for strong and weak acids and bases?? Thanks
by Melissa Villanueva1K
Wed Dec 05, 2018 6:34 pm
Forum: Administrative Questions and Class Announcements
Topic: Practice/Final Studying
Replies: 2
Views: 144

Practice/Final Studying

Does anyone have a Quizlet or a study guide they can share to help each other to study for this final???
by Melissa Villanueva1K
Sun Nov 25, 2018 9:43 pm
Forum: Administrative Questions and Class Announcements
Topic: Curve
Replies: 5
Views: 212

Curve

Does anyone know if this class is graded based on a curve?
by Melissa Villanueva1K
Sun Nov 25, 2018 9:39 pm
Forum: Dipole Moments
Topic: Dipole Moments
Replies: 2
Views: 80

Dipole Moments

How do we identify dipole moments in a compound? (an example would be greatly appreciated) Thanks!
Does it usually have to do the slightly negative and slightly positive components?
by Melissa Villanueva1K
Sat Nov 17, 2018 8:56 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: AXE
Replies: 7
Views: 188

AXE

Is there a method to figure out a molecule's AXE or do we just have to memorize them in accordance to the shape? Thanks!
by Melissa Villanueva1K
Sat Nov 17, 2018 8:53 pm
Forum: Sigma & Pi Bonds
Topic: Sigma and Pi bonds
Replies: 2
Views: 55

Sigma and Pi bonds

Which are stronger, sigma or pi bonds, and why?
by Melissa Villanueva1K
Sat Nov 17, 2018 8:52 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape
Replies: 2
Views: 56

Molecular Shape

How does VSEPR affect the shape of a molecule?
by Melissa Villanueva1K
Tue Nov 06, 2018 7:03 pm
Forum: Administrative Questions and Class Announcements
Topic: Thanksgiving Week
Replies: 2
Views: 102

Thanksgiving Week

Does anyone know if we will be having discussion the week of Thanksgiving?
by Melissa Villanueva1K
Tue Nov 06, 2018 6:55 pm
Forum: Coordinate Covalent Bonds
Topic: Coordinate Covalent Bond Definition
Replies: 14
Views: 687

Re: Coordinate Covalent Bond Definition

Has Dr.Lavelle talked about coordinate covalent bonds in lecture? Or did it completely go over my head in lecture...
by Melissa Villanueva1K
Tue Nov 06, 2018 6:53 pm
Forum: Bond Lengths & Energies
Topic: Bond Lengths
Replies: 6
Views: 155

Bond Lengths

Do we need to memorize certain bond lengths or will they just be given? And in terms of problems, how would they appear in practice problems or questions. Thanks!
by Melissa Villanueva1K
Tue Nov 06, 2018 6:51 pm
Forum: Sigma & Pi Bonds
Topic: Definition and distinguishing
Replies: 3
Views: 95

Definition and distinguishing

Could someone tell me what sigma and pi bonds are? As well as how to determine if a bond is a sigma or a pi bond. An example would really help, thanks!
by Melissa Villanueva1K
Tue Oct 30, 2018 9:20 pm
Forum: *Black Body Radiation
Topic: Midterm
Replies: 4
Views: 281

Midterm

Is Black Body Radiation going to be on the midterm? It was brought up in lecture and was in the reading, but Professor Lavelle told us not to worry about it. Just looking at what I have to study. Thanks!
by Melissa Villanueva1K
Tue Oct 30, 2018 8:52 pm
Forum: Lewis Structures
Topic: Central Atom
Replies: 13
Views: 237

Central Atom

When writing out the lewis structure for CH3OH how do we determine which one is the central atom? And if there are more than one, how do we determine that? Thanks!
by Melissa Villanueva1K
Tue Oct 30, 2018 8:48 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 4d^10 and 5s rule
Replies: 2
Views: 149

4d^10 and 5s rule

Could someone briefly describe what the rule or what the importance was behind the 4d^10 coming before the 5s when writing out the electron configuration for a certain element? Thanks!
by Melissa Villanueva1K
Thu Oct 25, 2018 7:09 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Tips and Tricks
Replies: 4
Views: 204

Re: Tips and Tricks

Awesome! Thanks so much, this was extremely helpful.
by Melissa Villanueva1K
Thu Oct 25, 2018 7:05 pm
Forum: Photoelectric Effect
Topic: Work Function
Replies: 14
Views: 643

Work Function

How would we solve for the work function? Like what type of information would be given to use in order to find the work function and how would we use the given. Thanks!
by Melissa Villanueva1K
Thu Oct 25, 2018 7:02 pm
Forum: DeBroglie Equation
Topic: Momentum
Replies: 10
Views: 517

Momentum

When using DeBroglie Equation, will the momentum always be given or would there be circumstances where we have to solve for it, if so how would we go about doing that? Thanks!
by Melissa Villanueva1K
Fri Oct 19, 2018 12:26 am
Forum: Administrative Questions and Class Announcements
Topic: Test #2
Replies: 3
Views: 107

Test #2

For test #2 what specifically should we review and are there any formulas we should memorize for the test?
by Melissa Villanueva1K
Fri Oct 19, 2018 12:24 am
Forum: Administrative Questions and Class Announcements
Topic: Homework Week 4
Replies: 4
Views: 110

Homework Week 4

Does anyone know if week 4 homework will still be on the Quantum World or will we start a new topic? Thanks!
by Melissa Villanueva1K
Fri Oct 19, 2018 12:20 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Tips and Tricks
Replies: 4
Views: 204

Tips and Tricks

I was wondering if there are any tips or tricks when it comes to memorizing or being able to know the electron configuration of an element. That goes along with the elements orbital drawing and so forth. Thanks!
by Melissa Villanueva1K
Thu Oct 11, 2018 10:09 pm
Forum: SI Units, Unit Conversions
Topic: Conversion
Replies: 6
Views: 218

Conversion

I'm currently working on a homework problem and one of the steps is to convert meters to Joules. Does anyone know a quick conversion or a way to go from meters to Joules? It would really help me out. Thanks!
by Melissa Villanueva1K
Thu Oct 11, 2018 10:00 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals
Replies: 2
Views: 84

Orbitals

Can someone briefly explain the relation between the amount subshells and the quantum number of an element? I don't think we've talked about it in class but there was reading on it and homework problems on it. Thanks!
by Melissa Villanueva1K
Thu Oct 11, 2018 4:26 pm
Forum: Administrative Questions and Class Announcements
Topic: Audio-Visual Assignments
Replies: 4
Views: 95

Audio-Visual Assignments

Are the audio-visual assignments with the pre-assessments, videos, and post-assessment apart of our homework grade? Like are our TA's or Professor Lavelle keeping track of which ones we complete. If anyone could clarify that would be great. Thanks!
by Melissa Villanueva1K
Thu Oct 04, 2018 10:49 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Accuracy and Precision
Replies: 4
Views: 98

Re: Accuracy and Precision

Accuracy refers to the closeness of a measured value to a the desired or known value. While precision refers to the closeness of two or more measurements to each other. Take a look at the target examples that were shown in lecture for a better reference. Hoped it helped!
by Melissa Villanueva1K
Thu Oct 04, 2018 10:39 pm
Forum: Significant Figures
Topic: Sig Figs
Replies: 3
Views: 60

Re: Sig Figs

For addition and subtraction count the number of significant figures in the decimal part only of each number in the problem. Then just add and/or subtract. Your final answer can have no more significant figures to the right of the decimal than the least number of significant figures in any number in...
by Melissa Villanueva1K
Thu Oct 04, 2018 10:33 pm
Forum: Empirical & Molecular Formulas
Topic: Writing Out Chemical Equation
Replies: 2
Views: 80

Writing Out Chemical Equation

How do you know which element goes first when writing out a chemical equation for a compound? For example a chemical equation that has silicone dioxide.

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