Search found 100 matches
- Sun Mar 15, 2020 7:42 am
- Forum: Zero Order Reactions
- Topic: What do each orders mean
- Replies: 7
- Views: 116
What do each orders mean
What does it mean when something is at zero, first, or second order? Also how do you calculate the concentration or rate constant using the integrated laws?
- Sun Mar 15, 2020 7:40 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Kinetic vs thermodynamics
- Replies: 8
- Views: 136
Kinetic vs thermodynamics
I have difficulty understanding how to solve the problem when it uses kinetics vs thermodynamics in the question? How do I solve the problem in both different cases?
- Sun Mar 15, 2020 7:38 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Activation energy vs free energy of activation
- Replies: 1
- Views: 67
Activation energy vs free energy of activation
What is the difference between activation energy and free energy of activation and do the two relate to one another?
- Sun Mar 15, 2020 7:36 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Difference in volume and temperature
- Replies: 6
- Views: 199
Difference in volume and temperature
What is the difference between using the volume and temperature change? If they are both calculating entropy change, does it result in the same value?
- Sun Mar 15, 2020 7:32 am
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Deriving the equation
- Replies: 4
- Views: 139
Deriving the equation
How do you derive the Nernst equation?
- Sun Mar 15, 2020 7:31 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Relationship between work, free energy, and cell potential
- Replies: 1
- Views: 96
Relationship between work, free energy, and cell potential
What is the relationship between work/ free energy with cell potential?
- Sun Mar 15, 2020 7:28 am
- Forum: Student Social/Study Group
- Topic: Tips and advice
- Replies: 1
- Views: 112
Tips and advice
Whenever I am solving problems, there are just so many equations that I have trouble figuring out which ones to use. If anyone has any tips and advice on how to indicate which equations to use during which times, that would be very helpful!
- Sun Mar 15, 2020 7:26 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Solving for rates
- Replies: 3
- Views: 93
Solving for rates
How do I solve this problem? Ethene is a component of natural gas, and its combustion has been thoroughly studied. At a certain temperature and pres-sure, the unique rate of the combustion reaction C2H4(g) + 3 O2(g) --> 2 CO2(g) + 2 H2O(g) is 0.44 mol? L21?s21. (a) What is the rate at which oxygen r...
- Sun Mar 15, 2020 7:22 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: calculating standard cell potential
- Replies: 6
- Views: 159
calculating standard cell potential
How would I calculate a standard cell potential, given the half-reactions for the cell and their standard potentials?
- Sun Mar 15, 2020 7:21 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Arrhenius eq
- Replies: 6
- Views: 125
Arrhenius eq
When do I know to use the Arrhenius equation?
- Sun Mar 15, 2020 7:20 am
- Forum: First Order Reactions
- Topic: How to solve
- Replies: 3
- Views: 93
How to solve
For all the 0,1,2 order reactions is it all plug and chug?
- Sun Mar 15, 2020 7:18 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Galvanic and voltaic cells
- Replies: 5
- Views: 149
Galvanic and voltaic cells
What's the importance between galvanic and voltaic cells?
- Sun Mar 15, 2020 6:49 am
- Forum: Zero Order Reactions
- Topic: When to use each order
- Replies: 9
- Views: 122
When to use each order
How do I know when it’s zero, first, and second order?
- Sat Mar 14, 2020 6:16 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Non spontaneous to spontaneous process?
- Replies: 2
- Views: 106
Non spontaneous to spontaneous process?
Can a non spontaneous process with a positive delta S become spontaneous if the temperature is increased (assuming that delta H and delta S are both independent of temperature)?
- Sat Mar 14, 2020 6:12 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Thermodynamic properties?
- Replies: 2
- Views: 126
Thermodynamic properties?
What exactly does it mean when a process can be predicted solely in terms of the thermodynamic properties of the system? What are the thermodynamic properties?
- Sat Mar 14, 2020 5:06 pm
- Forum: Administrative Questions and Class Announcements
- Topic: take home FINAL DEADLINE
- Replies: 15
- Views: 444
Re: take home FINAL DEADLINE
205405339 wrote:I was wondering by what time and day do we need to submit our take-home final by?
I think professor Lavelle said that it would be an open book 3 1/2 hours exam from 11:15 am -2:45 pm.
- Sat Mar 14, 2020 5:04 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Where to find the final exam
- Replies: 5
- Views: 114
Where to find the final exam
Is the final exam going to be provided on professor Lavelle's website at exactly 11:15? I am currently informed that its something we would have to print out and fill out then scan, if so will it be provided a few minutes in advance to give students time to print it out and get settled in a good stu...
- Sat Mar 14, 2020 5:00 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final- general questions
- Replies: 12
- Views: 295
Re: Final- general questions
I am getting a little anxious because I do not know general details about this final. What is the exact time limit? How are we going to be tested, is it all online and are we using zoom/video recording site while taking the test? How is the test formatted? I just feel like I do not know all the inf...
- Sat Mar 14, 2020 4:57 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Partial Credit
- Replies: 8
- Views: 178
Re: Partial Credit
Does anyone know how to scan from an at home wireless printer? Usually you'd just have to put your documents under the scanning part of the printer which is the part where you can open and close the printer and just press the scan function on it and it should either be sent to your desktop files or...
- Sat Mar 14, 2020 4:54 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Submission
- Replies: 8
- Views: 256
Final Submission
Where would we submit the final? Do we just have to scan it and email it to our TA's? I just want to make sure I know what the exact process is so I can be prepared.
- Sat Mar 14, 2020 3:31 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Reaction enthalpy
- Replies: 3
- Views: 137
Reaction enthalpy
How do you solve the reaction enthalpy of N2(g) + 3F2(g) ---> 2NF3(g)?
- Thu Mar 12, 2020 8:35 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Concentration cell question
- Replies: 3
- Views: 51
Re: Concentration cell question
WYacob_2C wrote:How were you able to figure out that Q is [anode]/[cathode]?
I think it is something that is just stated in the Nernst equation that Q is [anode]/[cathode].
- Thu Mar 12, 2020 7:12 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing the redox rxn in an acidic solution
- Replies: 5
- Views: 99
Re: Balancing the redox rxn in an acidic solution
Ohh so is it only H+ that you add in acidic solutions to balance it out and use no H20? Because when I solved this problem I got 6H+ + Cl2O7(g) ---> 2ClO2- (aq) + H2O + 5e-...I got this problem partially wrong and I was wondering why I did.
- Thu Mar 12, 2020 6:56 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Calculating Gibbs free energy of 1/2 rxn
- Replies: 3
- Views: 121
Re: Calculating Gibbs free energy of 1/2 rxn
Okay that makes more sense, but how do you determine if I use that electron transfer or the other? I used 1 mol because I was looking at the Ag equation.
- Thu Mar 12, 2020 6:25 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Le Chatelier's Principle
- Replies: 4
- Views: 144
Re: Le Chatelier's Principle
Thank you! This was extremely helpful :)
- Thu Mar 12, 2020 6:24 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing the redox rxn in an acidic solution
- Replies: 5
- Views: 99
Balancing the redox rxn in an acidic solution
How does this solution get balanced: Cl2O7 (g) =H2O2(aq) ---> ClO2(aq) + O2(g)?
- Thu Mar 12, 2020 6:16 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Calculating Gibbs free energy of 1/2 rxn
- Replies: 3
- Views: 121
Calculating Gibbs free energy of 1/2 rxn
The given half reactions are: Ag+ (aq) + e- ---> Ag(s) E*= 0.7996V Ni 2+ (aq) + 2e- ---> E*= -0.25V I solved for E*cell by using E*cell= E* right + E* left, which equaled to 1.0496V. Then I went to solve Gibbs free energy by using delta G*= -nFE*cell: -1 mol(96485 c/mol)(1.0497 V) and got -191270.65...
- Thu Mar 12, 2020 6:04 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Le Chatelier's Principle
- Replies: 4
- Views: 144
Le Chatelier's Principle
I'm a little confused as to how Le Chatelier's Principle really applied.
- Thu Mar 12, 2020 6:02 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Solving for the equilibrium constant
- Replies: 3
- Views: 199
Solving for the equilibrium constant
Calculate the equilibrium constant from the following thermodynamic data for this reaction at 30 degrees Celsius. CaCo3 (s) --> CaO (s) + CO2 (g), Delta S* = 181 J/mol and delta H* rxn= 221.5 kJ/ mol I started this problem off by plugging in the values into delta G*= delta H*- Tdelta S* and got 221....
- Thu Mar 12, 2020 5:53 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Concentration cell question
- Replies: 3
- Views: 51
Concentration cell question
A concentration cell was constructed with two electrodes containing AgNO3 (ap) at 25 degrees Celsius. The cathode concentration is 3.0 M and the cell potential is 0.0644 V; a) calculate concentration of anode solution b) how will each of the following changes affect the cell potential? i) adding 100...
- Mon Mar 09, 2020 11:58 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE table
- Replies: 5
- Views: 128
ICE table
When solving for concentrations with the ice table, in what situation can you assume x is too small and therefore can be excluded from the equation? EX: 0.2-x, in this situation would I just disregard x and just keep 0.2?
- Tue Mar 03, 2020 12:24 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Platinum
- Replies: 6
- Views: 95
Platinum
When writing out the cell diagram when do you know when to use Pt and not to use Pt?
- Mon Mar 02, 2020 6:08 pm
- Forum: Phase Changes & Related Calculations
- Topic: Absorb means "+"?
- Replies: 4
- Views: 186
Absorb means "+"?
In a combustion chamber, the total internal energy change produced from the burning of a fuel is -2573 kJ. The cooling system that surrounds the chamber absorbs 947 kJ as heat. How much work can be done by the fuel in the chamber? [CH 4B #7] I was a little confused with this problem because I though...
- Mon Feb 17, 2020 9:54 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Exothermic rxns being spontaneous
- Replies: 5
- Views: 151
Exothermic rxns being spontaneous
Why are most exothermic reactions spontaneous?
- Wed Feb 12, 2020 2:03 pm
- Forum: Phase Changes & Related Calculations
- Topic: calculating volume change
- Replies: 4
- Views: 119
Re: calculating volume change
Katie Kyan 2K wrote:You can use the equation for the volume of a cylinder which is pi(r^2)h. Since you know the diameter of the pump, you can find its radius and the delta h would be 20. cm because this is how far the pump is depressed.
Thank you!
- Wed Feb 12, 2020 2:03 pm
- Forum: Phase Changes & Related Calculations
- Topic: calculating volume change
- Replies: 4
- Views: 119
Re: calculating volume change
I figured out how to solve it by using the volume formula for the cylindrical shape pump and found the change volume equation (delta V= pie*r^2*delta h) and got delta V= pie(1.5 cm)^2(-20.0 cm)= 141.37 cm^3 and used 0.001 L=1 cm^3 to convert and got -0.1437 L. Then plugged the delta V into work=-Pex...
- Wed Feb 12, 2020 1:39 pm
- Forum: Phase Changes & Related Calculations
- Topic: calculating volume change
- Replies: 4
- Views: 119
calculating volume change
The inner diameter of the pump is 3.0 cm and the pump is depressed 20. cm with a pressure of 2.00 atm. This is a question where I would have to use the expansion work equation but in this situation for the change in volume how would i solve it? Question: 4A #3
- Tue Feb 11, 2020 8:18 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: completely deprotonating in water
- Replies: 1
- Views: 26
completely deprotonating in water
I know this isn't the right category and that this might be a 14A question but consider it being on one of the outlines, I was confused as to when you assume (with this equation Kw=[H30+] [OH-]) that the value is equal to [H30] or [OH]? Is it when something is completely deprotonated in water? For i...
- Mon Feb 03, 2020 10:11 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Ch 5I question #19
- Replies: 2
- Views: 53
Ch 5I question #19
A reaction mixture that consisted of 0.400 mol H2 and 1.60 mol I2 was introduced into a flask of volume 3.00 L and heated. At equilibrium, 60.0% of the hydrogen gas had reacted. What is the equilibrium constant K for the reaction H2(g)1I2(g) ∆ 2 HI(g) at this temperature? When solving this do you ha...
- Mon Feb 03, 2020 6:49 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Equilibrium concentration vs equilibrium molar conc.
- Replies: 3
- Views: 62
Equilibrium concentration vs equilibrium molar conc.
What is the difference in calculating the equilibrium concentration and the equilibrium molar concentration of a given molecule, or are these the same thing?
- Tue Jan 21, 2020 10:26 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE table
- Replies: 5
- Views: 73
ICE table
How do you determine the change in partial pressure ("C")?
- Tue Jan 21, 2020 12:00 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K vs Kc
- Replies: 1
- Views: 27
K vs Kc
When should you use K and Kc? It said whenever the calculations of an equilibrium constant from thermodynamic tables of data (standard Gibbs free energies of formation) it should use K and not Kc, why is this and what other instances would I have to keep this in mind?
- Mon Jan 20, 2020 10:35 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: When and when not to use "P"
- Replies: 1
- Views: 21
When and when not to use "P"
When should you put a "P" in front of the compound when writing out the equilibrium equation? Is it when it is a gas?
- Mon Jan 20, 2020 8:37 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Does order matter?
- Replies: 5
- Views: 49
Does order matter?
When listing the products and reactants into the equilibrium constant equation does it matter which order they are listed in?
- Mon Jan 20, 2020 8:30 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Equilibrium constants vs equilibrium of the P&R
- Replies: 3
- Views: 31
Equilibrium constants vs equilibrium of the P&R
I understand that the equilibrium constant is Kc or just K, but what does it mean when it is asking about the equilibrium constant of the products? For example it asks," if one starts with higher concentrations of reactants, the equilibrium concentrations of the products will be larger". I...
- Mon Jan 20, 2020 8:14 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Understanding the chart
- Replies: 1
- Views: 33
Understanding the chart
I need a little clarification on the chart 5G.2 ("Equilibrium constants for various reactions") on page 402 in the text book. How do they get the T/K*,K, and Kc values...?
- Sun Jan 19, 2020 11:29 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Clarification on these statements
- Replies: 2
- Views: 30
Clarification on these statements
What is the difference between saying "equilibrium is shifted to the right/left" versus when a reaction "lies to the right/left"?
- Sun Jan 19, 2020 11:20 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Reaction mixture at equilibrium
- Replies: 2
- Views: 18
Reaction mixture at equilibrium
Why would the composition of the reaction mixture remain constant when it is at equilibrium?
cobalt
When you are naming, when should you use cobalt and cobaltate??
Cyanido
When the bonding is on the C of CN and bonding is on the N of CN are they both cyanido because the text book called it both cyanido and isocyanido and i was wondering if they could be used interchangeably.
- Sat Dec 07, 2019 9:58 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: when to use what equation
- Replies: 5
- Views: 72
Re: when to use what equation
when do I use the Ka and Kb equations?
- Sat Dec 07, 2019 8:51 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final exam
- Replies: 17
- Views: 388
Re: Final exam
Malik Oda 1F wrote:ShastaB4C wrote:Does anyone know approximately how many questions the final exam will be?
all I know is that it will be 3 hours, so one hour longer than the midterm
I think there are 8.
- Sat Dec 07, 2019 5:35 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: when to use what equation
- Replies: 5
- Views: 72
when to use what equation
I was going over the textbook and I was still confused on when I should use what equation when solving for the pH for certain things.
- Sat Dec 07, 2019 5:27 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: negative pH
- Replies: 4
- Views: 113
negative pH
If something were to have a negative pH what would that signify?
- Sat Dec 07, 2019 5:16 pm
- Forum: Amphoteric Compounds
- Topic: amphiprotic character
- Replies: 1
- Views: 102
amphiprotic character
How would you write the chemical equations of the two proton transfer equilibria that demonstrate the amphiprotic character of HCO32?
- Sat Dec 07, 2019 4:20 pm
- Forum: Bronsted Acids & Bases
- Topic: determining acidity
- Replies: 2
- Views: 96
Re: determining acidity
also if an ion has a positive charge does that make it a base and if it has a negative charge would that make it acidic...
- Sat Dec 07, 2019 4:07 pm
- Forum: Bronsted Acids & Bases
- Topic: determining acidity
- Replies: 2
- Views: 96
Re: determining acidity
When you see an N in the compound is it safe to assume that it is acidic?
- Sat Dec 07, 2019 4:05 pm
- Forum: Bronsted Acids & Bases
- Topic: determining acidity
- Replies: 2
- Views: 96
determining acidity
How are you able to tell if an ion is neutral, basic, or acidic? Is this where you are suppose to use the pH equations?
- Sat Dec 07, 2019 3:59 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Main focus
- Replies: 3
- Views: 65
Re: Main focus
Thanks this actually helped a lot, good luck :')
- Sat Dec 07, 2019 3:15 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Main focus
- Replies: 3
- Views: 65
Main focus
What should be our main focus for this final? I know the final is cumulative but should we be studying more of post midterm concepts?
- Sat Dec 07, 2019 3:08 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final exam
- Replies: 17
- Views: 388
Re: Final exam
Do we also need to go over the buffer solutions? I wasn't sure because I remember Professor Lavelle saying that it was a chem 14b concept...
- Sat Dec 07, 2019 3:03 pm
- Forum: Conjugate Acids & Bases
- Topic: what materials to cover for final
- Replies: 2
- Views: 111
what materials to cover for final
Do we need to know buffer solutions for the final? What materials should we cover from post midterm to prepare for the final?
- Sat Dec 07, 2019 3:01 pm
- Forum: Conjugate Acids & Bases
- Topic: buffer solutions
- Replies: 5
- Views: 321
Re: buffer solutions
Buffer solutions usually contain a weak acid & the conj base. For example if there is HF and KF, this would be an example of a buffer solution because F- is the conj base for HF and KF has the F-.
- Sat Dec 07, 2019 2:58 pm
- Forum: Conjugate Acids & Bases
- Topic: how to figure out?
- Replies: 12
- Views: 296
Re: how to figure out?
the base ends up being the conjugate acid and the acid ends up being the conjugate base. The conj. base is the one where H+ gets removed and the conj. acid is the one where the H+ is added to H20.
- Sat Dec 07, 2019 2:38 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Equations
- Replies: 5
- Views: 65
Re: Equations
When do you use the Ka and Kb equations...? What's the difference between those and the pH and pOH equations?
- Sat Dec 07, 2019 1:45 pm
- Forum: Conjugate Acids & Bases
- Topic: single arrow vs double arrow
- Replies: 2
- Views: 226
single arrow vs double arrow
when the equation involves a weak acid it is written with a double arrow because the reaction is reversible but when the equation involves a strong base it is just a single arrow. HCl+H2O --> H3O+ + Cl-, if it was a weak acid that arrow would have one facing the product and the other facing the reac...
- Sat Dec 07, 2019 1:31 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Equations
- Replies: 5
- Views: 65
Re: Equations
Thank you, and also when the equation is pH=-log [H+] it is the same as pH=-log[H3O+]?
- Sat Dec 07, 2019 1:22 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Equations
- Replies: 5
- Views: 65
Equations
Will the equations like pH=-log [H+], Ka=x^2/Ha-x, and etc. be provided on the final?
- Sat Dec 07, 2019 1:21 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: acid & bases to memorize
- Replies: 3
- Views: 105
acid & bases to memorize
Do we just need to memorize the common strong&weak acids&bases for the final? Strong acids: HCl, HBr, HI, HNO3, H2SO4, HClO4 Weak acids: HF, NH4 (and its safe to assume its a weak base if its not on the common strong acids listed above?) *More oxygen=more acidic Strong bases: KOH, NaOH, BaOH...
- Fri Dec 06, 2019 9:39 pm
- Forum: Conjugate Acids & Bases
- Topic: determining conj. acids& bases
- Replies: 2
- Views: 141
determining conj. acids& bases
How do you determine what the conj. acid and bases are?
- Sat Nov 30, 2019 5:27 pm
- Forum: *Stereochemistry
- Topic: Lecture on 11/22 (Friday) & 11/27 (Wednesday)
- Replies: 1
- Views: 107
Lecture on 11/22 (Friday) & 11/27 (Wednesday)
What were the topics that were covered during these days? I ended up missing these lectures due to personal reason, if possible could someone send me the lecture notes please?
- Tue Nov 26, 2019 7:58 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Test #2 handback
- Replies: 11
- Views: 233
Test #2 handback
When will test #2 be handed back?
- Wed Nov 20, 2019 12:26 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: H-bonding vs ion-dipole
- Replies: 4
- Views: 53
Re: H-bonding vs ion-dipole
In the textbook it mentions that Hydrogen bonds are so strong (10% of covalent bond's strength) that it dominates all other types of intermolecular interactions (pg 192 of textbook).
- Tue Nov 19, 2019 11:02 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: Polar/nonpolar boiling point
- Replies: 2
- Views: 38
Polar/nonpolar boiling point
Do polar molecules have a higher boiling point than non-polar molecules?
- Tue Nov 19, 2019 10:43 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: Dipole-dipole interacting species
- Replies: 2
- Views: 46
Re: Dipole-dipole interacting species
I think the text book was saying that the stationary molecules were referring to solids and the rotating molecules were referring to gases.
- Tue Nov 19, 2019 8:02 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: Dipole-dipole interacting species
- Replies: 2
- Views: 46
Dipole-dipole interacting species
In the text book it says that dipole-dipole has stationary & rotating polar molecules that are involved in this interaction. What does it mean by stationary & rotating? Does it have to do with the sigma and pi bonds?
- Tue Nov 19, 2019 7:56 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: Coulomb formula
- Replies: 1
- Views: 39
Coulomb formula
When would you use the Coulomb formula? (ch 3F.1)
- Tue Nov 19, 2019 6:56 pm
- Forum: Ionic & Covalent Bonds
- Topic: Direction in anions increase in polarizability
- Replies: 3
- Views: 149
Direction in anions increase in polarizability
Which way do anions increase in polarizability? is it left and up the periodic table like cations or are they different?
- Tue Nov 19, 2019 4:16 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: Boiling/melting points
- Replies: 5
- Views: 62
Re: Boiling/melting points
Thank you this helped a lot! I was also wondering whether we to draw the dipole arrow towards the positive or negative particle charge during the test and exams. I know that the text book specified the two different ones the original convention and the modern convention.
- Tue Nov 19, 2019 4:09 pm
- Forum: Dipole Moments
- Topic: H-bonding & temperature
- Replies: 1
- Views: 79
H-bonding & temperature
I remember in discussion we were told that the temperatures for: H2O,H2S, H2Se, and H2Te went from high temp for H2O then drops down then starts from H2S and increases from then on to H2Te. I am a little confused on how this trend works.
- Tue Nov 19, 2019 4:08 pm
- Forum: Dipole Moments
- Topic: Determining intermolecular forces
- Replies: 4
- Views: 119
Determining intermolecular forces
How do you determine which intermolecular force is involved in a molecule?
- Tue Nov 19, 2019 4:01 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: H-bonding vs ion-dipole
- Replies: 4
- Views: 53
Re: H-bonding vs ion-dipole
I think hydrogen bonding is stronger than dipole-dipole, i'm not totally sure but I think hydrogen bonding should be the strongest of all the intermolecular forces. The strength of each intermolecular force from lowest to highest should be: induced-induced, dipole-induced, dipole-dipole, ion-dipole,...
- Tue Nov 19, 2019 3:56 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: Boiling/melting points
- Replies: 5
- Views: 62
Boiling/melting points
How are you able to determine which molecules have a higher or lower boiling/melting points?
- Mon Nov 18, 2019 10:13 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test #2
- Replies: 22
- Views: 2272
Re: Test #2
So do we technically need to do chapters 2D, 2E, and 2F, since the midterm was up until 2D right?
- Mon Nov 18, 2019 10:04 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Trigonal Bipyramidal
- Replies: 5
- Views: 55
Re: Trigonal Bipyramidal
Thanks that helped cleared things up, also is the electron arrangement the same thing as electron geometry?
- Mon Nov 18, 2019 8:50 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Trigonal Bipyramidal
- Replies: 5
- Views: 55
Trigonal Bipyramidal
In the text book it said that if the shape was trigonal bipyramidal it should have 5 bonding pairs and no lone pairs but for example 2E.3 toolbox question in the text book mentions that SF4 is trigonal bipyramidal even though it had a lone pair because it has 5 regions of electron density. So does i...
- Mon Nov 04, 2019 11:37 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test #1 answers
- Replies: 1
- Views: 64
Test #1 answers
Where would we get the answers for test #1 because I'm using it to review for the midterm and I would like to know if I was solving these problems right.
- Mon Nov 04, 2019 11:01 pm
- Forum: SI Units, Unit Conversions
- Topic: Formula Units
- Replies: 2
- Views: 145
Formula Units
When something asks for its formula units what is it asking for? (HW Q: E.23)
- Mon Oct 21, 2019 10:20 pm
- Forum: Trends in The Periodic Table
- Topic: Homework #4
- Replies: 5
- Views: 80
Homework #4
Is week 4's homework suppose to be questions from "the quantum world" or "chemical bonds"? I looked on the objectives and saw that the topics that Professor Lavelle went over in today's lecture (10/21/19) were on the quantum world. But I also know that he told us to do questions ...
- Wed Oct 09, 2019 1:34 am
- Forum: SI Units, Unit Conversions
- Topic: Conversion
- Replies: 3
- Views: 102
Conversion
If it is mmol does that mean milli(10^-3) moles, also when converting moles to grams is it: moles x grams of the atom?
- Wed Oct 09, 2019 1:22 am
- Forum: Empirical & Molecular Formulas
- Topic: Molecular formula
- Replies: 6
- Views: 1036
Molecular formula
If you were given the total molecular mass and given the mass percentage compositions of all the elements, how would you solve for the molecular formula using the total mass or would you just disregard it?
- Tue Oct 08, 2019 11:54 pm
- Forum: SI Units, Unit Conversions
- Topic: Knowing the atomic mass for test #1
- Replies: 4
- Views: 107
Re: Knowing the atomic mass for test #1
Jasmine Vallarta 4E wrote:My TA told us that we would be provided with a periodic table with those values
Ok thank you!
- Tue Oct 08, 2019 11:46 pm
- Forum: SI Units, Unit Conversions
- Topic: Knowing the atomic mass for test #1
- Replies: 4
- Views: 107
Knowing the atomic mass for test #1
For test #1 will we be given a periodic table with the atomic masses or will we have to memorize those as well. Since these are used to calculate things on the test.
- Tue Oct 08, 2019 10:04 pm
- Forum: Empirical & Molecular Formulas
- Topic: Estimating the greatest mass percentage
- Replies: 2
- Views: 66
Estimating the greatest mass percentage
When it asks to try estimate which element will have the greatest mass percentage without any calculations does that mean assume based on how many atoms of one element there are? Q:F3
- Thu Oct 03, 2019 9:54 pm
- Forum: Balancing Chemical Reactions
- Topic: adding a product
- Replies: 6
- Views: 85
Re: adding a product
Thanks so much, I was just getting confused to whether it was the moles of something or the number of molecules of something.
- Thu Oct 03, 2019 9:52 pm
- Forum: Balancing Chemical Reactions
- Topic: Combustion
- Replies: 12
- Views: 285
Combustion
When something combusts, does it reacts with O2 and produce CO2 and H2O?
- Thu Oct 03, 2019 8:53 pm
- Forum: Balancing Chemical Reactions
- Topic: adding a product
- Replies: 6
- Views: 85
adding a product
When balancing equations, you're not able to just add an atom of something instead you're suppose to add more molecules of something right?
- Thu Oct 03, 2019 1:13 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Avogadro's Number
- Replies: 8
- Views: 248
Re: Avogadro's Number
LReedy_3I wrote:Yes, Avogadro's number is the number of atoms in one mole. For E7, I divided 2.1x10^9 atoms of carbon by 6.022x10^23 to determine the number of moles to be 3.5x10^-15 mol.
Thank you!
- Thu Oct 03, 2019 12:16 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Avogadro's Number
- Replies: 8
- Views: 248
Avogadro's Number
Do you use the Avogadro's number when you have to convert the the number of atoms to moles? Q:E7
- Wed Oct 02, 2019 9:49 pm
- Forum: SI Units, Unit Conversions
- Topic: Sig figs
- Replies: 18
- Views: 349
Re: Sig figs
During discussion, my TA said that Professor Lavelle is more lenient about sig figs because students use to ask a lot of questions about that during lecture and would take too much time away. But you should still be aware of the values given in the questions and use those sig figs. That doesn't mean...