Search found 64 matches
- Sat Mar 16, 2019 12:42 pm
- Forum: Student Social/Study Group
- Topic: Solutions for Tests 1 and 2
- Replies: 7
- Views: 1173
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!
- Sat Mar 16, 2019 12:25 pm
- Forum: Zero Order Reactions
- Topic: Graphs
- Replies: 13
- Views: 1390
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!
- Sat Mar 16, 2019 12:22 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalysts
- Replies: 2
- Views: 275
Catalysts
How will catalysts be incorporated into a problem? Thanks!
- Sat Mar 16, 2019 12:20 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Finding k
- Replies: 1
- Views: 178
Finding k
How do we determine which trial we should use when looking for k? Thanks!
- Fri Mar 15, 2019 10:33 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: k & K
- Replies: 18
- Views: 2201
Re: k & K
Will there be a clear indication of 'k' and 'K' on the final? Such as bolding one over the other. Thanks.
- 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: 291
Re: Lecture Cell Diagram Example
Thanks so much for the clarification! It helped a lot!
- Fri Mar 15, 2019 3:32 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Types of Molecularity
- Replies: 4
- Views: 2262
Types of Molecularity
What are the different types of molecularity and what do they mean?
- Fri Mar 15, 2019 3:31 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Molecularity
- Replies: 3
- Views: 758
Molecularity
How does one determine the molecularity of a reaction?
- 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: 291
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!
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!
- Thu Mar 14, 2019 5:57 pm
- Forum: Student Social/Study Group
- Topic: Studying for the Final
- Replies: 25
- Views: 2817
Re: Studying for the Final
Practice problems, homework and also looking over the pasts tests/midterm.
- Thu Mar 14, 2019 5:46 pm
- Forum: Zero Order Reactions
- Topic: Order distinction
- Replies: 9
- Views: 1112
Re: Order distinction
You look at the exponent of the reactant in the rate law. With multiple reactants you add up the exponents.
- Thu Mar 14, 2019 5:39 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Arrhenius Equation.
- Replies: 4
- Views: 535
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)
- Thu Mar 14, 2019 5:28 pm
- Forum: General Rate Laws
- Topic: when to use what
- Replies: 1
- Views: 192
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!
- Thu Mar 14, 2019 5:25 pm
- Forum: General Rate Laws
- Topic: Unique, Instantaneous, and Average Rate
- Replies: 1
- Views: 193
Unique, Instantaneous, and Average Rate
What is the difference between unique rate, instantaneous rate and average rate?
- Mon Mar 04, 2019 12:06 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Endergonic vs. Endothermic
- Replies: 6
- Views: 1933
Endergonic vs. Endothermic
Can someone explain the difference between endergonic and endothermic? Thanks!
- Mon Mar 04, 2019 12:01 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Delta G rules
- Replies: 8
- Views: 783
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)
- Sun Mar 03, 2019 11:54 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Pt(s)
- Replies: 10
- Views: 1068
Re: Pt(s)
Can it be written at the beginning of a cell diagram or does it always have to be in the end?
- Sun Mar 03, 2019 11:52 pm
- Forum: Van't Hoff Equation
- Topic: Sample problem
- Replies: 2
- Views: 563
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!
- Thu Feb 21, 2019 11:29 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing / Skeletal Equations
- Replies: 4
- Views: 617
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!
- Thu Feb 21, 2019 11:25 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing Redox Rxns
- Replies: 2
- Views: 338
Balancing Redox Rxns
What are the steps I should take when approaching and balancing a redox reaction?
- Thu Feb 21, 2019 11:23 pm
- Forum: Van't Hoff Equation
- Topic: Overview
- Replies: 8
- Views: 1125
Overview
Can someone please give me a brief explanation or overview of the Van't Hoff Equation? Thanks!
- Thu Feb 21, 2019 11:22 pm
- Forum: Student Social/Study Group
- Topic: Outline
- Replies: 1
- Views: 261
Outline
Which outline are we currently in, outline 4 or 5? Thanks!
- Thu Feb 21, 2019 11:21 pm
- Forum: Student Social/Study Group
- Topic: Midterm Results
- Replies: 4
- Views: 540
Midterm Results
Does anyone know when we'll get our midterms back?
- Wed Feb 06, 2019 11:38 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Midterm [ENDORSED]
- Replies: 49
- Views: 4894
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.
- Wed Feb 06, 2019 11:35 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Degeneracy
- Replies: 2
- Views: 235
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.
- Wed Feb 06, 2019 11:27 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: 'C' constant
- Replies: 2
- Views: 211
'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?
- Wed Feb 06, 2019 11:23 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Negative q
- Replies: 7
- Views: 2778
Negative q
When do you use a negative value for q when calculating entropy?
- Fri Jan 25, 2019 12:19 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Ka
- Replies: 6
- Views: 690
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!
- Thu Jan 24, 2019 9:45 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Acids and Bases (weak or strong)
- Replies: 3
- Views: 444
Acids and Bases (weak or strong)
How do we determine whether an acid or base is strong or weak? Thanks!
- Thu Jan 24, 2019 9:26 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Test 1
- Replies: 2
- Views: 259
Test 1
Will percentage protonation be on test 1?
- Thu Jan 24, 2019 9:23 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Forming hydronium or hydroxide
- Replies: 1
- Views: 180
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!
- 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: 506
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!
- Sun Jan 13, 2019 10:38 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Calculations
- Replies: 2
- Views: 279
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 ...
- Fri Dec 07, 2018 7:21 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone Pairs
- Replies: 5
- Views: 552
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.
- Fri Dec 07, 2018 7:18 pm
- Forum: Student Social/Study Group
- Topic: Studying for tests/midterm
- Replies: 18
- Views: 2792
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.
- Fri Dec 07, 2018 7:14 pm
- Forum: Student Social/Study Group
- Topic: Worksheets/Practice
- Replies: 1
- Views: 538
Worksheets/Practice
Does anyone know of good practice problems or past final exams from Dr.Lavelle? Thanks.
- 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: 291
Calculate pH or pOH [ENDORSED]
How do you calculate the pH or pOH?
- Wed Dec 05, 2018 6:39 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Intermolecular Forces
- Replies: 1
- Views: 217
Intermolecular Forces
Do intermolecular forces influence a molecule's shape? If it does, how? Thanks.
- Wed Dec 05, 2018 6:36 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Final Exam
- Replies: 7
- Views: 704
Final Exam
Will we need to know how to calculate the pH or pOH for strong and weak acids and bases?? Thanks
- Wed Dec 05, 2018 6:34 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Practice/Final Studying
- Replies: 2
- Views: 490
Practice/Final Studying
Does anyone have a Quizlet or a study guide they can share to help each other to study for this final???
- Sun Nov 25, 2018 9:43 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Curve
- Replies: 5
- Views: 794
Curve
Does anyone know if this class is graded based on a curve?
- Sun Nov 25, 2018 9:39 pm
- Forum: Dipole Moments
- Topic: Dipole Moments
- Replies: 2
- Views: 308
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?
Does it usually have to do the slightly negative and slightly positive components?
- Sat Nov 17, 2018 8:56 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: AXE
- Replies: 7
- Views: 744
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!
- Sat Nov 17, 2018 8:53 pm
- Forum: Sigma & Pi Bonds
- Topic: Sigma and Pi bonds
- Replies: 2
- Views: 193
Sigma and Pi bonds
Which are stronger, sigma or pi bonds, and why?
- Sat Nov 17, 2018 8:52 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular Shape
- Replies: 2
- Views: 247
Molecular Shape
How does VSEPR affect the shape of a molecule?
- Tue Nov 06, 2018 7:03 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Thanksgiving Week
- Replies: 2
- Views: 352
Thanksgiving Week
Does anyone know if we will be having discussion the week of Thanksgiving?
- Tue Nov 06, 2018 6:55 pm
- Forum: Coordinate Covalent Bonds
- Topic: Coordinate Covalent Bond Definition
- Replies: 14
- Views: 1867
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...
- Tue Nov 06, 2018 6:53 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Lengths
- Replies: 6
- Views: 613
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!
- Tue Nov 06, 2018 6:51 pm
- Forum: Sigma & Pi Bonds
- Topic: Definition and distinguishing
- Replies: 3
- Views: 501
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!
- Tue Oct 30, 2018 9:20 pm
- Forum: *Black Body Radiation
- Topic: Midterm
- Replies: 4
- Views: 661
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!
- Tue Oct 30, 2018 8:52 pm
- Forum: Lewis Structures
- Topic: Central Atom
- Replies: 13
- Views: 916
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!
- 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: 3359
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!
- Thu Oct 25, 2018 7:09 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Tips and Tricks
- Replies: 4
- Views: 1410
Re: Tips and Tricks
Awesome! Thanks so much, this was extremely helpful.
- Thu Oct 25, 2018 7:05 pm
- Forum: Photoelectric Effect
- Topic: Work Function
- Replies: 14
- Views: 2254
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!
- Thu Oct 25, 2018 7:02 pm
- Forum: DeBroglie Equation
- Topic: Momentum
- Replies: 10
- Views: 1467
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!
- Fri Oct 19, 2018 12:26 am
- Forum: Administrative Questions and Class Announcements
- Topic: Test #2
- Replies: 3
- Views: 274
Test #2
For test #2 what specifically should we review and are there any formulas we should memorize for the test?
- Fri Oct 19, 2018 12:24 am
- Forum: Administrative Questions and Class Announcements
- Topic: Homework Week 4
- Replies: 4
- Views: 453
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!
- Fri Oct 19, 2018 12:20 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Tips and Tricks
- Replies: 4
- Views: 1410
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!
- Thu Oct 11, 2018 10:09 pm
- Forum: SI Units, Unit Conversions
- Topic: Conversion
- Replies: 6
- Views: 581
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!
- Thu Oct 11, 2018 10:00 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Orbitals
- Replies: 2
- Views: 163
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!
- Thu Oct 11, 2018 4:26 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Audio-Visual Assignments
- Replies: 4
- Views: 277
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!
- Thu Oct 04, 2018 10:49 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Accuracy and Precision
- Replies: 4
- Views: 495
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!
- Thu Oct 04, 2018 10:39 pm
- Forum: Significant Figures
- Topic: Sig Figs
- Replies: 3
- Views: 283
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...
- Thu Oct 04, 2018 10:33 pm
- Forum: Empirical & Molecular Formulas
- Topic: Writing Out Chemical Equation
- Replies: 2
- Views: 293
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.