Search found 106 matches

by 205150314
Tue Mar 17, 2020 2:09 pm
Forum: General Science Questions
Topic: Question
Replies: 1
Views: 90

Question

Will chem community points for 11 week be extra offered just help for the 10th week
by 205150314
Tue Mar 17, 2020 2:08 pm
Forum: Administrative Questions and Class Announcements
Topic: Grading
Replies: 3
Views: 144

Grading

Will we still be following the curve grading scheme?
by 205150314
Tue Mar 17, 2020 2:06 pm
Forum: General Science Questions
Topic: Enthalpy
Replies: 3
Views: 274

Enthalpy

How do we find the enthalpy for ionization?
by 205150314
Tue Mar 17, 2020 2:05 pm
Forum: General Science Questions
Topic: Final chem
Replies: 3
Views: 122

Final chem

When would we get the results for the test?
by 205150314
Sat Mar 14, 2020 6:09 pm
Forum: Experimental Details
Topic: Textbook 7A.17
Replies: 2
Views: 47

Re: Textbook 7A.17

Aliya Jain 2B wrote:have you tried log(5.839) / log(2.5)?


I havent but is that something we have to do for experimental rate laws ?
by 205150314
Sat Mar 14, 2020 5:39 pm
Forum: Experimental Details
Topic: Textbook 7A.17
Replies: 2
Views: 47

Textbook 7A.17

how would we find the experimental rate law for B if the conrations give me a value of 2.5 and the rates give me 5.83908046. I cant get second order which it is.
by 205150314
Fri Mar 13, 2020 5:49 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Instantaneous rate of change
Replies: 3
Views: 81

Instantaneous rate of change

Is the equation of the instantaneous rate of change (-d[A]/adt) the same as the differential rate law (K[R]^n)?
If it is then why is it that the differential rate law doesnt have a negative and the instantaneous does?
by 205150314
Fri Mar 13, 2020 10:29 am
Forum: General Science Questions
Topic: Study guide 4th Q
Replies: 2
Views: 132

Re: Study guide 4th Q

Posting the question for reference: Screen Shot 2020-03-12 at 10.51.51 PM.png The cathode here is aluminum (E naught = -1.66V) and anode is magnesium (E naught = -2.36V). When subtracting, Ecell= E cathode - E anode, so -1.66V - (-2.36V) is +0.70V. The negatives cancel out. Perhaps you were confuse...
by 205150314
Thu Mar 12, 2020 7:27 pm
Forum: General Science Questions
Topic: Study guide 4th Q
Replies: 2
Views: 132

Study guide 4th Q

if the equation for the E cell is cathode my anode, shouldnt the answer be -4.02?
by 205150314
Thu Mar 12, 2020 6:56 pm
Forum: General Science Questions
Topic: Study guide
Replies: 2
Views: 88

Study guide

I didnt know where to ask this but on the third question of the professors study guide powerpoint where did he get the equation from? I dont recognize it
by 205150314
Thu Mar 12, 2020 8:18 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Endo VS Exo
Replies: 4
Views: 65

Endo VS Exo

How are you able to tell whether a a rxn is endo or exo just by the value of the fwd and rev rxns?
by 205150314
Wed Mar 11, 2020 1:54 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Study guide question
Replies: 2
Views: 103

Study guide question

What does the professor mean on his powerpoint for the final by "IF IT IS A SALT WITH A BASIC ANION, THEN pH > 7 AND CALCULATE [OH¯]
THEN USE pH + pOH = 14.00 TO CALCULATE pH"
by 205150314
Sun Mar 08, 2020 9:31 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Elementary reactions
Replies: 5
Views: 53

Re: Elementary reactions

They're the steps we combine to get the overall reaction
by 205150314
Sun Mar 08, 2020 9:30 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Exothermic vs. Endothermic
Replies: 10
Views: 477

Re: Exothermic vs. Endothermic

activation energy is in both types of reactions
by 205150314
Sun Mar 08, 2020 9:28 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: molecularity
Replies: 5
Views: 30

molecularity

Are we only going to go up to Termolecuar?
by 205150314
Sun Mar 08, 2020 9:26 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: A
Replies: 8
Views: 53

A

is A the initial concentration or given concentrations when plugging them into equations? or is it not even concentrations?
by 205150314
Sun Mar 08, 2020 9:13 pm
Forum: General Science Questions
Topic: Slope
Replies: 4
Views: 101

Slope

So how exactly do we get the slope of the reaction
by 205150314
Wed Mar 04, 2020 9:17 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: EMF
Replies: 1
Views: 30

EMF

Can someone explain what it means for EMF to be the max potential difference ?
by 205150314
Sun Mar 01, 2020 9:06 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: kinetically stable?
Replies: 10
Views: 128

kinetically stable?

What does that mean
by 205150314
Sun Mar 01, 2020 9:06 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: order of reactions
Replies: 7
Views: 102

order of reactions

What does the order of the reaction tell you ?
by 205150314
Sun Mar 01, 2020 8:46 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: reaction supported through kinetics
Replies: 2
Views: 57

reaction supported through kinetics

What did the professor mean when he said the reaction of diamond to graphite was supported through kinetics more than thermo.
by 205150314
Sun Mar 01, 2020 8:45 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: cell diagrams
Replies: 4
Views: 65

cell diagrams

What do we do when a a reaction doesn't have a solid?
by 205150314
Sun Mar 01, 2020 8:20 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: when to use K or Q
Replies: 18
Views: 233

when to use K or Q

When do we use -RTlnK and -RTlnQ
by 205150314
Wed Feb 19, 2020 10:58 pm
Forum: Balancing Redox Reactions
Topic: 6K.3 Part D
Replies: 2
Views: 50

Re: 6K.3 Part D

^I didnt see it on the solution manual on the class website, are you sure?
by 205150314
Sun Feb 16, 2020 11:49 pm
Forum: Balancing Redox Reactions
Topic: Why do we split equations?
Replies: 12
Views: 114

Re: Why do we split equations?

makes it easier to distinguish between the redox reactions
by 205150314
Sun Feb 16, 2020 11:47 pm
Forum: Balancing Redox Reactions
Topic: Whats the difference between oxidizing agent and oxiadation
Replies: 6
Views: 89

Re: Whats the difference between oxidizing agent and oxiadation

oxidation is losing electron, I believe oxidizing agent is the one that is reduced because it oxidizes the other molecule by taking the electrons
by 205150314
Sun Feb 16, 2020 11:45 pm
Forum: Balancing Redox Reactions
Topic: Redox Reactions
Replies: 12
Views: 82

Re: Redox Reactions

oxidation and reduction reactions.
Reduction is when you gain an electron and rOxidation is when you lose one
by 205150314
Wed Feb 12, 2020 4:33 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Pizza Rolls 6 (pt.1)
Replies: 10
Views: 228

Re: Pizza Rolls 6 (pt.1)

Leila_4G wrote:We are never given T so we can't solve the last step for w and therefore q.

could you explain to me the problem please? like values
by 205150314
Mon Feb 10, 2020 10:01 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 12
Views: 148

Re: Midterm

6-8 pm and you can find the location on the class website
by 205150314
Mon Feb 10, 2020 8:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Pizza Rolls REVIEW Session DOWNLOAD HERE
Replies: 67
Views: 2818

Re: Pizza Rolls REVIEW Session DOWNLOAD HERE

Can someone help me solve problem 3B? I wasnt able to make it to the review session and the enthalpy of fusion is causing me problems
by 205150314
Sun Feb 09, 2020 9:43 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: equations
Replies: 4
Views: 53

equations

Any tips or tricks on how to know which formula to use in question if they give you multiple givens, like Temp, Pressure or Volume?
by 205150314
Sun Feb 09, 2020 9:40 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE BOX Reverse ?
Replies: 4
Views: 96

ICE BOX Reverse ?

If the [] of a reactant is not given in then do we assume the [] is 1? I remember one of the TA's doing something like this in a review session but I cant exactly remember the question
by 205150314
Sun Feb 09, 2020 9:34 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Ka Kb
Replies: 11
Views: 148

Ka Kb

Just trying to reassure things before the midterm. When exactly can you tell that you would either need Ka or Kb?
by 205150314
Wed Feb 05, 2020 8:02 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 4F.9
Replies: 2
Views: 29

4F.9

Why is it that we plug in the inverse of pressures as the volumes when solving the entropy of an ideal gas ?
by 205150314
Wed Feb 05, 2020 7:45 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 4F.7
Replies: 2
Views: 26

Re: 4F.7

AArmellini_1I wrote:I don't have my homework on me right now but on thing I messed up on was using the wrong R, check your units and make sure everything cancels and you get the correct units. Different R's have different units


i figured it out , like a dumbo I didnt convert it to Kelvin

Thank you though!
by 205150314
Wed Feb 05, 2020 7:29 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 4F.7
Replies: 2
Views: 26

4F.7

Ive read that we need to use 3/2 R and 5/2R with the formulas of Cp/v*ln(T2/T1) but I am not getting the right answers . is R not 8.3145? or do I need to divide the entire thing by 2?
by 205150314
Tue Jan 28, 2020 9:51 pm
Forum: Calculating Work of Expansion
Topic: 4A.3
Replies: 2
Views: 45

Re: 4A.3

Justin Vayakone 1C wrote:My answer book shows 28J. Your statement regarding internal energy and work is correct.

Thank you
by 205150314
Tue Jan 28, 2020 9:49 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 4A.9
Replies: 4
Views: 51

4A.9

Im getting a negative answer for heat released = heat absorbed, does anyone know why?
im doing 20*.39*(100-T)= 50.7*4.18(T-22)
by 205150314
Tue Jan 28, 2020 9:13 pm
Forum: Calculating Work of Expansion
Topic: 4A.3
Replies: 2
Views: 45

4A.3

So I read in the book that the change in internal energy without the inclusion of heat is equal to the work. But in the answers, part C is 8j and not 28. does anyone know why?
by 205150314
Sun Jan 26, 2020 9:54 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE BOX
Replies: 27
Views: 246

ICE BOX

when do we know that X is too small to be making a difference for the denominator in the ICE box?
by 205150314
Sun Jan 26, 2020 9:53 pm
Forum: Phase Changes & Related Calculations
Topic: Heat capacities
Replies: 6
Views: 71

Heat capacities

Will the specific heat capacity be given on tests or will have to memorize some of them ? like water
by 205150314
Sun Jan 26, 2020 9:49 pm
Forum: Phase Changes & Related Calculations
Topic: 3 Methods
Replies: 4
Views: 46

3 Methods

So out of the 3 Methods Professor Lavelle discussed, which will be most likely using more ? The first two seem to simple
by 205150314
Sun Jan 26, 2020 9:45 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Finding Ka from pH
Replies: 5
Views: 56

Finding Ka from pH

To find Ka/Kb from pH/pOH we would just need to do the inverse log of the the pH/pOH correct?
by 205150314
Sun Jan 26, 2020 9:42 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Clarification on example
Replies: 2
Views: 37

Clarification on example

Can someone please clarify an example professor Lavelle gave once about 1*10^-11 M HCl not creating that much concentration of H3O+ and then stating that H2O has 1*10^-7 [] of H3O+? I didn't write down everything and now its kind of confusing me.
by 205150314
Tue Jan 14, 2020 2:41 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6B.5 C
Replies: 2
Views: 34

Re: 6B.5 C

Alicia Lin 2F wrote:for every one mole of Ba(OH)2, there is 2 moles of OH- produced. Remember to take the concentration of Ba(OH)2 and multiply by 2 before taking the -log.


Thanks
by 205150314
Tue Jan 14, 2020 2:34 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6B.5 C
Replies: 2
Views: 34

6B.5 C

I found the pOH of the concentration of Ba(OH)2 and it was 2.036212173 but in hte answers it says 1.74. has anyone else gotten this ?
by 205150314
Tue Jan 14, 2020 12:35 pm
Forum: Ideal Gases
Topic: Partial Pressure
Replies: 8
Views: 88

Re: Partial Pressure

Its called partial pressure because you are only calculating the pressure of that one gas in the mixture of gases so you're only getting one piece reaction. Thats why there is a partial pressure and a total pressure.
by 205150314
Tue Jan 14, 2020 12:32 pm
Forum: Ideal Gases
Topic: When to use this equation
Replies: 14
Views: 157

Re: When to use this equation

I think you use PV=nRT when you're trying to switch between concentration and pressure of when trying to calculate the partial pressures.
by 205150314
Thu Jan 09, 2020 10:43 pm
Forum: Ideal Gases
Topic: Solving for K when only given balanced equation [ENDORSED]
Replies: 6
Views: 72

Re: Solving for K when only given balanced equation [ENDORSED]

P is for partial pressure, usually used when the reaction only has gases and no aqueous solutions
by 205150314
Thu Jan 09, 2020 10:40 pm
Forum: Ideal Gases
Topic: Understanding Q
Replies: 13
Views: 109

Re: Understanding Q

briannam_1F wrote:When calculating for Q do we omit solids and pure liquids as well?


Yes you would leave them out because Q is pretty much K, with the difference being that Q is at any time during the reaction but you would calculate it the same way as K
by 205150314
Thu Jan 09, 2020 10:39 pm
Forum: Ideal Gases
Topic: 5G1 true/false
Replies: 8
Views: 125

Re: 5G1 true/false

The question asks to determine if the statement is true or false and explain why. In part c it states "If one starts with higher pressure of reactant, the equilibrium constant will be larger." I thought this was true because if there is higher pressure of reactant it will shift toward the...
by 205150314
Thu Jan 09, 2020 10:37 pm
Forum: Ideal Gases
Topic: Adding reactions
Replies: 4
Views: 51

Adding reactions

Why is it that when we add reactions together we multiply the K's ?
by 205150314
Thu Jan 09, 2020 10:32 pm
Forum: Ideal Gases
Topic: K
Replies: 10
Views: 98

Re: K

If Kc and Kp are suppose to be the same, then why does the chart on 5G.2 have different values for some K and Kc?
by 205150314
Sun Dec 08, 2019 9:05 am
Forum: Administrative Questions and Class Announcements
Topic: Wavelength
Replies: 2
Views: 65

Re: Wavelength

nicolely3B wrote:The last three audio-visual focus topics on Prof Lavelle's website all have a bunch of questions with wavelengths, but you have to go through the simpler, conceptual questions first. Other than that, I think Dino Nuggets (towards the end) has the best

thanks
by 205150314
Sun Dec 08, 2019 2:20 am
Forum: Administrative Questions and Class Announcements
Topic: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]
Replies: 111
Views: 5025

Re: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]

How do we go about finding the shape for ligands ? how was c on minimarshamllow an octahedron ?
by 205150314
Sun Dec 08, 2019 2:19 am
Forum: Administrative Questions and Class Announcements
Topic: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]
Replies: 111
Views: 5025

Re: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]

Final, does anyone know if the test will be evenly distributed or if it will focus more on items after the midterm
by 205150314
Sun Dec 08, 2019 2:19 am
Forum: Administrative Questions and Class Announcements
Topic: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]
Replies: 111
Views: 5025

Re: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]

Minimarshamllow, how do you know when a compound will make an acid or base?
by 205150314
Sat Dec 07, 2019 11:51 pm
Forum: Administrative Questions and Class Announcements
Topic: Wavelength
Replies: 2
Views: 65

Wavelength

Does anyone know any good wavelength questions that would be good to practice ?
by 205150314
Sat Dec 07, 2019 10:51 pm
Forum: Administrative Questions and Class Announcements
Topic: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]
Replies: 111
Views: 5025

Re: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]

could someone explain #34 on marshmallow to me? Is the solution basic or acidic and why? How do we know whether it'll be acidic or basic
by 205150314
Sat Dec 07, 2019 10:46 pm
Forum: Administrative Questions and Class Announcements
Topic: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]
Replies: 111
Views: 5025

Re: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]

On question number 21 of the Marshmallow review. Why does iron have a +2 charge if two of the nitrogens on the porphyrin ligand have a +1 charge? The two nitrogens actually have a -1 charge, not +1. How is the charge for the nitrogens -1? I believe its -1 because of the 4 Bonds (2 single, 1 double)...
by 205150314
Sat Dec 07, 2019 10:43 pm
Forum: Administrative Questions and Class Announcements
Topic: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]
Replies: 111
Views: 5025

Re: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]

For mini marshmallow 2c why does Potassium dicyanobis(ethylenediamine)cuprate (I) have a coordination number of 6? doesnnt it only have 4 atoms around it? or does the chelating ligand add more.
by 205150314
Mon Nov 25, 2019 7:55 am
Forum: Naming
Topic: Naming
Replies: 3
Views: 43

Naming

For naming the new compounds we have been learning, will this be something crucial in knowing or is it just useful knowledge in knowing how to identify compounds and such.
by 205150314
Mon Nov 25, 2019 7:50 am
Forum: Administrative Questions and Class Announcements
Topic: Points
Replies: 11
Views: 166

Re: Points

AnvitaaAnandkumar_1B wrote:I think the TAs said you would be able to see it at the end of the quarter.


but there's no way of viewing how many i have or haven't done correct? Would it even be such a big impact on my grade ?
by 205150314
Mon Nov 25, 2019 7:17 am
Forum: Student Social/Study Group
Topic: Test 2 and Final
Replies: 18
Views: 226

Re: Test 2 and Final

Does anyone know if we will get some sort of study tools again?
by 205150314
Mon Nov 25, 2019 7:14 am
Forum: Student Social/Study Group
Topic: Class Grading
Replies: 44
Views: 2073

Re: Class Grading

205150314 wrote:So how can we try to figure out the grade we might get? or si there no way of finding that out right now


If the midterm average was like a 75 then what would be considered an A for that test if the professor based the grading scheme on the average?
by 205150314
Mon Nov 25, 2019 7:09 am
Forum: Student Social/Study Group
Topic: Class Grading
Replies: 44
Views: 2073

Re: Class Grading

So how can we try to figure out the grade we might get? or si there no way of finding that out right now
by 205150314
Mon Nov 25, 2019 6:36 am
Forum: *Molecular Orbital Theory Applied To Transition Metals
Topic: Ligands
Replies: 5
Views: 163

Ligands

Does the coordination number describe the ligand or the central atom of the ligands?
by 205150314
Mon Nov 25, 2019 6:35 am
Forum: Administrative Questions and Class Announcements
Topic: Points
Replies: 11
Views: 166

Points

is there any way to check the online discussion points ?
by 205150314
Mon Nov 18, 2019 1:27 pm
Forum: Hybridization
Topic: 2F.7
Replies: 2
Views: 31

Re: 2F.7

Benjamin Feng 4B wrote:AsF3 also has a lone electron pair, which counts as an electron domain. This makes for 4 total domains and therefore sp3 hybridization.


oh okay thank you, I was thinking that only bonds counted as the electron density areas
by 205150314
Mon Nov 18, 2019 1:25 pm
Forum: Hybridization
Topic: 2F.7
Replies: 2
Views: 31

2F.7

How does AsF3 use a sp3 hybrid orbital if it only has 3 areas or electron density ?
by 205150314
Sun Nov 17, 2019 10:47 pm
Forum: Hybridization
Topic: Hybridization focus
Replies: 4
Views: 42

Re: Hybridization focus

Sidharth D wrote:The test will probably focus on elements up until the 3p block.


Do you know if we also need to know about the orientation of the orbitals ?
by 205150314
Sun Nov 17, 2019 10:02 pm
Forum: Hybridization
Topic: Hybridization focus
Replies: 4
Views: 42

Re: Hybridization focus

Sidharth D wrote:The test will probably focus on elements up until the 3p block.


Thank you
by 205150314
Sun Nov 17, 2019 9:18 pm
Forum: Hybridization
Topic: Hybridization focus
Replies: 4
Views: 42

Hybridization focus

Will the the test possibly have hybridization for elements with long electron configurations ? or is it okay to focus on the smaller elements ?
by 205150314
Sun Nov 17, 2019 8:13 pm
Forum: Hybridization
Topic: Pi and Sigma Bonds
Replies: 17
Views: 488

Re: Pi and Sigma Bonds

why do we need to give bonds a secondary name? what do the names mean?
by 205150314
Sun Nov 17, 2019 8:07 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2 Length
Replies: 9
Views: 104

Re: Test 2 Length

Kimberly Bauer 4E wrote:How many questions are on test 2 and what topics will be covered aside from polarity, IMFS, VSEPR, and Sigma and Pi bonds? Is it mostly conceptual compared to Test1 and the midterm?


sigma and pi bonds?
by 205150314
Sun Nov 17, 2019 8:06 pm
Forum: Administrative Questions and Class Announcements
Topic: test 2
Replies: 2
Views: 53

test 2

Will test 2 be the same length as test 1?
by 205150314
Sun Nov 17, 2019 8:05 pm
Forum: Administrative Questions and Class Announcements
Topic: test 2
Replies: 7
Views: 115

test 2

Does anyone have any good tips on how to remember bond angles?
by 205150314
Wed Nov 06, 2019 3:00 pm
Forum: Administrative Questions and Class Announcements
Topic: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]
Replies: 52
Views: 4953

Re: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]

Could someone please explain 8b please? I used the photoelectric effect equation relating kinetic energy, energy of the photon, and the work function, but for some reason I'm not getting the correct answer. i think they used the wrong mass of an electron because when i went to the review session th...
by 205150314
Wed Nov 06, 2019 2:38 pm
Forum: Administrative Questions and Class Announcements
Topic: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]
Replies: 52
Views: 4953

Re: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]

Could someone please explain 8b please? I used the photoelectric effect equation relating kinetic energy, energy of the photon, and the work function, but for some reason I'm not getting the correct answer. i think they used the wrong mass of an electron because when i went to the review session th...
by 205150314
Wed Nov 06, 2019 2:04 pm
Forum: DeBroglie Equation
Topic: Dino Nuggets Problem 8b
Replies: 11
Views: 491

Re: Dino Nuggets Problem 8b

8. B) A newly designed laser pointer with a certain frequency is pointed at a sodium at a sodium metal surface. An electron is ejected from the metal surface with wavelength 1.10nm. What is the frequency of the light from the laser pointer? The work function of sodium is 150.6 kJmol^1. I understand...
by 205150314
Wed Nov 06, 2019 12:50 pm
Forum: Administrative Questions and Class Announcements
Topic: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]
Replies: 52
Views: 4953

Re: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]

For 6b., I am confused about why GarBreadium has the longer deBroglie wavelength. Shouldn't it be He because it weighs more? GarBreadium weighs less so it'll make the denominator smaller compared to the denominator of He so the outcome (length) will be larger than if you were to divide by a larger ...
by 205150314
Tue Nov 05, 2019 6:10 pm
Forum: Administrative Questions and Class Announcements
Topic: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]
Replies: 52
Views: 4953

Re: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]

For Dino Nuggets 6a, what equation do we need to use ? ive been trying to use different one (because theres a lot for E) and that molar mass is messing me up.
by 205150314
Sun Nov 03, 2019 10:39 pm
Forum: Administrative Questions and Class Announcements
Topic: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]
Replies: 52
Views: 4953

Re: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]

Can someone please explain how to solve question 2 from Dino Nuggets? Conceptually, I understand how to solve this type of problem but my numbers keep coming out different so I must be doing something wrong. Thank you! I'm having the same problem, if you found the answer could you please let me know
by 205150314
Thu Oct 31, 2019 9:32 pm
Forum: Administrative Questions and Class Announcements
Topic: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]
Replies: 52
Views: 4953

Re: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]

Micah3J wrote:If I am unable to make the review session tomorrow night but still work out the problems on my own, will the answers be posted on here so I can check my work?

Yea it says it right there that the answers will be posted after the review session
by 205150314
Mon Oct 28, 2019 6:43 pm
Forum: Ionic & Covalent Bonds
Topic: 2A.5
Replies: 4
Views: 64

Re: 2A.5

In the case of copper, a full d subshell is more stable than only being partially filled. This means that the electron configuration of Cu is [Ar] 3d10 4s1. Since this question asks about Cu+, there is one less electron, so it is taken out from the s subshell to maintain the full d subshell. So the...
by 205150314
Mon Oct 28, 2019 5:40 pm
Forum: Ionic & Covalent Bonds
Topic: 2A.13
Replies: 1
Views: 25

2A.13

The question asks from which orbital will an electron need to be removed from to form a +1 ion but for b, doesnt Cl form an anion?
by 205150314
Mon Oct 28, 2019 5:38 pm
Forum: Ionic & Covalent Bonds
Topic: 2A.5
Replies: 4
Views: 64

2A.5

Why do the ions have missing electrons from the orbitals that come before like for Cu+ why is he electron taken out of 4s2 and why were both taken out ?
by 205150314
Mon Oct 28, 2019 5:29 pm
Forum: Ionic & Covalent Bonds
Topic: valence electrons
Replies: 6
Views: 64

Re: valence electrons

Remember that valence electrons are the amount of electrons in the outermost shell, or the highest n-value. For an atom configuration with say, [Ar] 3d10 4s2 4p3, the outermost shell is 4, so the electrons with the n=4 are the valence electrons. So that particular atom has 5 valence electrons. For ...
by 205150314
Mon Oct 28, 2019 5:25 pm
Forum: Ionic & Covalent Bonds
Topic: Roman numerals
Replies: 2
Views: 20

Re: Roman numerals

Yes, the roman numerals represent the charge for the transition metals
by 205150314
Mon Oct 28, 2019 9:32 am
Forum: Administrative Questions and Class Announcements
Topic: Class canceled ?
Replies: 1
Views: 42

Class canceled ?

People have gotten a text saying classes have been cancelled , so we still have to go or not ?
by 205150314
Thu Oct 24, 2019 9:52 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: s, p, d, f orbitals
Replies: 15
Views: 175

Re: s, p, d, f orbitals

So do we place them in order by that image or by n?
by 205150314
Thu Oct 24, 2019 9:51 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: ground state
Replies: 6
Views: 93

Re: ground state

For ground state does every orbital need to have at least one electron in it before pairing , otherwise its excited?
by 205150314
Thu Oct 24, 2019 9:49 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: order of electron configuration
Replies: 4
Views: 63

Re: order of electron configuration

My TA told me to do it by n, so keep all the same n together
by 205150314
Thu Oct 24, 2019 9:47 pm
Forum: Electronegativity
Topic: Trend of Electronegativity
Replies: 18
Views: 2964

Re: Trend of Electronegativity

yes they are pretty much the same thing with different meanings. Right and up increases.
by 205150314
Thu Oct 24, 2019 9:45 pm
Forum: Resonance Structures
Topic: Lewis Structures vs. Resonance
Replies: 3
Views: 319

Re: Lewis Structures vs. Resonance

Resonance are just variations of the Lewis dot diagram. I think it typically just on how you can change the bonds.
by 205150314
Wed Oct 16, 2019 2:45 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: HW Question 1.B.25
Replies: 3
Views: 59

Re: HW Question 1.B.25

For this problem, I got delta p as greater than or equal to 1.51*10^-25. However, when I try to find delta v, the solution manual states to multiply by 1/2, so it looks like this: .5((1.5*10^-34)/(9.1*10^-31)(350*10^-12))= 1.65*10^5 m/s. Again, why would you multiply that by .5? Isn't the original ...

Go to advanced search