Search found 100 matches

by 205192823
Sun Mar 15, 2020 7:42 am
Forum: Zero Order Reactions
Topic: What do each orders mean
Replies: 3
Views: 61

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?
by 205192823
Sun Mar 15, 2020 7:40 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Kinetic vs thermodynamics
Replies: 3
Views: 79

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?
by 205192823
Sun Mar 15, 2020 7:38 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Activation energy vs free energy of activation
Replies: 1
Views: 52

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?
by 205192823
Sun Mar 15, 2020 7:36 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Difference in volume and temperature
Replies: 3
Views: 141

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?
by 205192823
Sun Mar 15, 2020 7:28 am
Forum: Student Social/Study Group
Topic: Tips and advice
Replies: 1
Views: 90

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!
by 205192823
Sun Mar 15, 2020 7:26 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Solving for rates
Replies: 3
Views: 63

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...
by 205192823
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: 90

calculating standard cell potential

How would I calculate a standard cell potential, given the half-reactions for the cell and their standard potentials?
by 205192823
Sun Mar 15, 2020 7:21 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius eq
Replies: 5
Views: 64

Arrhenius eq

When do I know to use the Arrhenius equation?
by 205192823
Sun Mar 15, 2020 7:20 am
Forum: First Order Reactions
Topic: How to solve
Replies: 3
Views: 58

How to solve

For all the 0,1,2 order reactions is it all plug and chug?
by 205192823
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: 102

Galvanic and voltaic cells

What's the importance between galvanic and voltaic cells?
by 205192823
Sun Mar 15, 2020 6:49 am
Forum: Zero Order Reactions
Topic: When to use each order
Replies: 2
Views: 53

When to use each order

How do I know when it’s zero, first, and second order?
by 205192823
Sat Mar 14, 2020 6:16 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Non spontaneous to spontaneous process?
Replies: 2
Views: 79

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)?
by 205192823
Sat Mar 14, 2020 6:12 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Thermodynamic properties?
Replies: 2
Views: 75

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?
by 205192823
Sat Mar 14, 2020 5:06 pm
Forum: Administrative Questions and Class Announcements
Topic: take home FINAL DEADLINE
Replies: 15
Views: 303

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.
by 205192823
Sat Mar 14, 2020 5:04 pm
Forum: Administrative Questions and Class Announcements
Topic: Where to find the final exam
Replies: 5
Views: 63

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...
by 205192823
Sat Mar 14, 2020 5:00 pm
Forum: Administrative Questions and Class Announcements
Topic: Final- general questions
Replies: 12
Views: 174

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...
by 205192823
Sat Mar 14, 2020 4:57 pm
Forum: Administrative Questions and Class Announcements
Topic: Partial Credit
Replies: 8
Views: 119

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...
by 205192823
Sat Mar 14, 2020 4:54 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Submission
Replies: 8
Views: 202

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.
by 205192823
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: 98

Reaction enthalpy

How do you solve the reaction enthalpy of N2(g) + 3F2(g) ---> 2NF3(g)?
by 205192823
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: 35

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].
by 205192823
Thu Mar 12, 2020 7:12 pm
Forum: Balancing Redox Reactions
Topic: Balancing the redox rxn in an acidic solution
Replies: 5
Views: 46

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.
by 205192823
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: 88

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.
by 205192823
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: 92

Re: Le Chatelier's Principle

Thank you! This was extremely helpful :)
by 205192823
Thu Mar 12, 2020 6:24 pm
Forum: Balancing Redox Reactions
Topic: Balancing the redox rxn in an acidic solution
Replies: 5
Views: 46

Balancing the redox rxn in an acidic solution

How does this solution get balanced: Cl2O7 (g) =H2O2(aq) ---> ClO2(aq) + O2(g)?
by 205192823
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: 88

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...
by 205192823
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: 92

Le Chatelier's Principle

I'm a little confused as to how Le Chatelier's Principle really applied.
by 205192823
Thu Mar 12, 2020 6:02 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Solving for the equilibrium constant
Replies: 3
Views: 154

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....
by 205192823
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: 35

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...
by 205192823
Mon Mar 09, 2020 11:58 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE table
Replies: 5
Views: 57

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?
by 205192823
Tue Mar 03, 2020 12:24 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Platinum
Replies: 6
Views: 42

Platinum

When writing out the cell diagram when do you know when to use Pt and not to use Pt?
by 205192823
Mon Mar 02, 2020 6:08 pm
Forum: Phase Changes & Related Calculations
Topic: Absorb means "+"?
Replies: 4
Views: 141

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...
by 205192823
Mon Feb 17, 2020 9:54 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Exothermic rxns being spontaneous
Replies: 5
Views: 96

Exothermic rxns being spontaneous

Why are most exothermic reactions spontaneous?
by 205192823
Wed Feb 12, 2020 2:03 pm
Forum: Phase Changes & Related Calculations
Topic: calculating volume change
Replies: 4
Views: 94

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!
by 205192823
Wed Feb 12, 2020 2:03 pm
Forum: Phase Changes & Related Calculations
Topic: calculating volume change
Replies: 4
Views: 94

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...
by 205192823
Wed Feb 12, 2020 1:39 pm
Forum: Phase Changes & Related Calculations
Topic: calculating volume change
Replies: 4
Views: 94

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
by 205192823
Tue Feb 11, 2020 8:18 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: completely deprotonating in water
Replies: 1
Views: 24

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...
by 205192823
Mon Feb 03, 2020 10:11 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Ch 5I question #19
Replies: 2
Views: 39

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...
by 205192823
Mon Feb 03, 2020 6:49 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium concentration vs equilibrium molar conc.
Replies: 3
Views: 57

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?
by 205192823
Tue Jan 21, 2020 10:26 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE table
Replies: 5
Views: 57

ICE table

How do you determine the change in partial pressure ("C")?
by 205192823
Tue Jan 21, 2020 12:00 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K vs Kc
Replies: 1
Views: 21

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?
by 205192823
Mon Jan 20, 2020 10:35 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: When and when not to use "P"
Replies: 1
Views: 18

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?
by 205192823
Mon Jan 20, 2020 8:37 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Does order matter?
Replies: 5
Views: 40

Does order matter?

When listing the products and reactants into the equilibrium constant equation does it matter which order they are listed in?
by 205192823
Mon Jan 20, 2020 8:30 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium constants vs equilibrium of the P&R
Replies: 3
Views: 27

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...
by 205192823
Mon Jan 20, 2020 8:14 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Understanding the chart
Replies: 1
Views: 32

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...?
by 205192823
Sun Jan 19, 2020 11:29 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Clarification on these statements
Replies: 2
Views: 27

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"?
by 205192823
Sun Jan 19, 2020 11:20 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Reaction mixture at equilibrium
Replies: 2
Views: 15

Reaction mixture at equilibrium

Why would the composition of the reaction mixture remain constant when it is at equilibrium?
by 205192823
Sun Dec 08, 2019 12:18 am
Forum: Naming
Topic: cobalt
Replies: 4
Views: 130

cobalt

When you are naming, when should you use cobalt and cobaltate??
by 205192823
Sun Dec 08, 2019 12:13 am
Forum: Naming
Topic: Cyanido
Replies: 2
Views: 117

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.
by 205192823
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: 62

Re: when to use what equation

when do I use the Ka and Kb equations?
by 205192823
Sat Dec 07, 2019 8:51 pm
Forum: Administrative Questions and Class Announcements
Topic: Final exam
Replies: 17
Views: 284

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.
by 205192823
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: 62

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.
by 205192823
Sat Dec 07, 2019 5:27 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: negative pH
Replies: 4
Views: 71

negative pH

If something were to have a negative pH what would that signify?
by 205192823
Sat Dec 07, 2019 5:16 pm
Forum: Amphoteric Compounds
Topic: amphiprotic character
Replies: 1
Views: 80

amphiprotic character

How would you write the chemical equations of the two proton transfer equilibria that demonstrate the amphiprotic character of HCO32?
by 205192823
Sat Dec 07, 2019 4:20 pm
Forum: Bronsted Acids & Bases
Topic: determining acidity
Replies: 2
Views: 83

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...
by 205192823
Sat Dec 07, 2019 4:07 pm
Forum: Bronsted Acids & Bases
Topic: determining acidity
Replies: 2
Views: 83

Re: determining acidity

When you see an N in the compound is it safe to assume that it is acidic?
by 205192823
Sat Dec 07, 2019 4:05 pm
Forum: Bronsted Acids & Bases
Topic: determining acidity
Replies: 2
Views: 83

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?
by 205192823
Sat Dec 07, 2019 3:59 pm
Forum: Administrative Questions and Class Announcements
Topic: Main focus
Replies: 3
Views: 63

Re: Main focus

Thanks this actually helped a lot, good luck :')
by 205192823
Sat Dec 07, 2019 3:15 pm
Forum: Administrative Questions and Class Announcements
Topic: Main focus
Replies: 3
Views: 63

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?
by 205192823
Sat Dec 07, 2019 3:08 pm
Forum: Administrative Questions and Class Announcements
Topic: Final exam
Replies: 17
Views: 284

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...
by 205192823
Sat Dec 07, 2019 3:03 pm
Forum: Conjugate Acids & Bases
Topic: what materials to cover for final
Replies: 2
Views: 93

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?
by 205192823
Sat Dec 07, 2019 3:01 pm
Forum: Conjugate Acids & Bases
Topic: buffer solutions
Replies: 5
Views: 253

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-.
by 205192823
Sat Dec 07, 2019 2:58 pm
Forum: Conjugate Acids & Bases
Topic: how to figure out?
Replies: 12
Views: 213

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.
by 205192823
Sat Dec 07, 2019 2:38 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Equations
Replies: 5
Views: 55

Re: Equations

When do you use the Ka and Kb equations...? What's the difference between those and the pH and pOH equations?
by 205192823
Sat Dec 07, 2019 1:45 pm
Forum: Conjugate Acids & Bases
Topic: single arrow vs double arrow
Replies: 2
Views: 137

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...
by 205192823
Sat Dec 07, 2019 1:31 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Equations
Replies: 5
Views: 55

Re: Equations

Thank you, and also when the equation is pH=-log [H+] it is the same as pH=-log[H3O+]?
by 205192823
Sat Dec 07, 2019 1:22 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Equations
Replies: 5
Views: 55

Equations

Will the equations like pH=-log [H+], Ka=x^2/Ha-x, and etc. be provided on the final?
by 205192823
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: 69

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...
by 205192823
Fri Dec 06, 2019 9:39 pm
Forum: Conjugate Acids & Bases
Topic: determining conj. acids& bases
Replies: 2
Views: 121

determining conj. acids& bases

How do you determine what the conj. acid and bases are?
by 205192823
Sat Nov 30, 2019 5:27 pm
Forum: *Stereochemistry
Topic: Lecture on 11/22 (Friday) & 11/27 (Wednesday)
Replies: 1
Views: 94

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?
by 205192823
Tue Nov 26, 2019 7:58 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test #2 handback
Replies: 11
Views: 140

Test #2 handback

When will test #2 be handed back?
by 205192823
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: 48

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).
by 205192823
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: 36

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.
by 205192823
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: 36

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?
by 205192823
Tue Nov 19, 2019 6:56 pm
Forum: Ionic & Covalent Bonds
Topic: Direction in anions increase in polarizability
Replies: 3
Views: 143

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?
by 205192823
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: 53

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.
by 205192823
Tue Nov 19, 2019 4:09 pm
Forum: Dipole Moments
Topic: H-bonding & temperature
Replies: 1
Views: 53

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.
by 205192823
Tue Nov 19, 2019 4:08 pm
Forum: Dipole Moments
Topic: Determining intermolecular forces
Replies: 4
Views: 111

Determining intermolecular forces

How do you determine which intermolecular force is involved in a molecule?
by 205192823
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: 48

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,...
by 205192823
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: 53

Boiling/melting points

How are you able to determine which molecules have a higher or lower boiling/melting points?
by 205192823
Mon Nov 18, 2019 10:13 pm
Forum: Administrative Questions and Class Announcements
Topic: Test #2
Replies: 22
Views: 2163

Re: Test #2

So do we technically need to do chapters 2D, 2E, and 2F, since the midterm was up until 2D right?
by 205192823
Mon Nov 18, 2019 10:04 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Trigonal Bipyramidal
Replies: 5
Views: 51

Re: Trigonal Bipyramidal

Thanks that helped cleared things up, also is the electron arrangement the same thing as electron geometry?
by 205192823
Mon Nov 18, 2019 8:50 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Trigonal Bipyramidal
Replies: 5
Views: 51

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...
by 205192823
Mon Nov 04, 2019 11:37 pm
Forum: Administrative Questions and Class Announcements
Topic: Test #1 answers
Replies: 1
Views: 61

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.
by 205192823
Mon Nov 04, 2019 11:01 pm
Forum: SI Units, Unit Conversions
Topic: Formula Units
Replies: 2
Views: 143

Formula Units

When something asks for its formula units what is it asking for? (HW Q: E.23)
by 205192823
Mon Oct 21, 2019 10:20 pm
Forum: Trends in The Periodic Table
Topic: Homework #4
Replies: 5
Views: 76

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 ...
by 205192823
Wed Oct 09, 2019 1:34 am
Forum: SI Units, Unit Conversions
Topic: Conversion
Replies: 3
Views: 97

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?
by 205192823
Wed Oct 09, 2019 1:22 am
Forum: Empirical & Molecular Formulas
Topic: Molecular formula
Replies: 6
Views: 695

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?
by 205192823
Tue Oct 08, 2019 11:54 pm
Forum: SI Units, Unit Conversions
Topic: Knowing the atomic mass for test #1
Replies: 4
Views: 81

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!
by 205192823
Tue Oct 08, 2019 11:46 pm
Forum: SI Units, Unit Conversions
Topic: Knowing the atomic mass for test #1
Replies: 4
Views: 81

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.
by 205192823
Tue Oct 08, 2019 10:04 pm
Forum: Empirical & Molecular Formulas
Topic: Estimating the greatest mass percentage
Replies: 2
Views: 65

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
by 205192823
Thu Oct 03, 2019 9:54 pm
Forum: Balancing Chemical Reactions
Topic: adding a product
Replies: 6
Views: 81

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.
by 205192823
Thu Oct 03, 2019 9:52 pm
Forum: Balancing Chemical Reactions
Topic: Combustion
Replies: 12
Views: 237

Combustion

When something combusts, does it reacts with O2 and produce CO2 and H2O?
by 205192823
Thu Oct 03, 2019 8:53 pm
Forum: Balancing Chemical Reactions
Topic: adding a product
Replies: 6
Views: 81

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?
by 205192823
Thu Oct 03, 2019 1:13 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Avogadro's Number
Replies: 8
Views: 197

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!
by 205192823
Thu Oct 03, 2019 12:16 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Avogadro's Number
Replies: 8
Views: 197

Avogadro's Number

Do you use the Avogadro's number when you have to convert the the number of atoms to moles? Q:E7
by 205192823
Wed Oct 02, 2019 9:49 pm
Forum: SI Units, Unit Conversions
Topic: Sig figs
Replies: 18
Views: 323

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...

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