Search found 78 matches

by Kenan Kherallah 2C
Sat Mar 16, 2019 9:30 pm
Forum: Administrative Questions and Class Announcements
Topic: LYNDON'S PORK RAMEN REVIEW
Replies: 37
Views: 2351

Re: LYNDON'S PORK RAMEN REVIEW

705192887 wrote:Can someone who went to the review session post pictures of it? Thanks

Pleaseeee
by Kenan Kherallah 2C
Fri Mar 15, 2019 7:09 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Deriving
Replies: 3
Views: 59

Deriving

On the syllabus it says that we have to know how to derive first second and third orders. I assume that this is because they wont be handed to us on the constants and equations sheet. But I'm a bit worried that we might actually be able to have to derive rate laws from integrated rate laws as I have...
by Kenan Kherallah 2C
Fri Mar 15, 2019 9:31 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: K' VS K
Replies: 1
Views: 32

Re: K' VS K

I think its more k1 vs k2. In that case the second rate constant given would be k2
by Kenan Kherallah 2C
Fri Mar 15, 2019 9:30 am
Forum: Environment, Ozone, CFCs
Topic: Homogeneous Catalysts and Ozone
Replies: 2
Views: 172

Re: Homogeneous Catalysts and Ozone

I would also like to know the answer to this question
by Kenan Kherallah 2C
Mon Mar 11, 2019 4:26 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Activated complex
Replies: 3
Views: 145

Activated complex

Do we have to know how to draw the transition state (question 15.85 on 6th edition) on the final?
by Kenan Kherallah 2C
Fri Mar 08, 2019 2:12 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Slow step
Replies: 4
Views: 73

Re: Slow step

Just to go along with what the person above said, if they tell you the activation energies, the slow step is the one with the higher or larger Ea
by Kenan Kherallah 2C
Fri Mar 08, 2019 2:10 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Final
Replies: 3
Views: 64

Re: Final

Yup just like 14A it will be cumulative
by Kenan Kherallah 2C
Sun Mar 03, 2019 12:53 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Test 2
Replies: 7
Views: 137

Re: Test 2

You would look at the reducing power which is another way of saying how likely the substance is to be oxidized. This means the more negative the E potential the better.
by Kenan Kherallah 2C
Sun Mar 03, 2019 12:51 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Why does -Wsys = Wmax?
Replies: 1
Views: 37

Re: Why does -Wsys = Wmax?

I would also like to know the answer to this question. What I do know is that Gsys= Wmax
by Kenan Kherallah 2C
Wed Feb 27, 2019 7:10 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: 14.107 Solution Manual Error?
Replies: 4
Views: 500

Re: 14.107 Solution Manual Error?

I dont understand why K = H+/OH-. I thought it should be Kw= H+ times OH-. Can someone explain?
by Kenan Kherallah 2C
Fri Feb 22, 2019 10:14 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: oxygen, hydrogen, water
Replies: 1
Views: 74

oxygen, hydrogen, water

In cell diagrams in the textbook, they are much more complicated than those that we practiced in class. In many answers, I see the placement of H+ and I just want to know why (worked example 14.7 in the 6th edition shows this). Also, how do we balance this reaction (d) Pt(s) | O2 | H+(aq) || OH-(aq)...
by Kenan Kherallah 2C
Fri Feb 22, 2019 9:41 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: HW Problem 5.57
Replies: 1
Views: 55

Re: HW Problem 5.57

By finding the gibbs free energy change through summation of products gibbs free energy minus summation of reactants gibbs free energy, we can now set this value equal to = -RT lnK and solve
by Kenan Kherallah 2C
Fri Feb 22, 2019 9:40 pm
Forum: Calculating Work of Expansion
Topic: Week 5 Discussion Notes&worksheet (2E,I,K)
Replies: 3
Views: 373

Re: Week 5 Discussion Notes&worksheet (2E,I,K)

Are there notes for Gibbs and electrochemistry?
by Kenan Kherallah 2C
Fri Feb 22, 2019 9:38 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Test 2 Help
Replies: 7
Views: 114

Test 2 Help

In class on Friday Dr. Lavelle said that he was finished covering everything we need for the test 2 but I see that we have not covered anything to do with equilibrium constants in relation to standard electrode potentials (section 14.8 in the 6th edition) with the formula: ln K = nrFE°/RT On his web...
by Kenan Kherallah 2C
Thu Feb 14, 2019 6:26 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Expansion of a system
Replies: 7
Views: 183

Re: Expansion of a system

Expansion relates to an increase in volume occupied (which corrolates to an increase in number of moles)
by Kenan Kherallah 2C
Thu Feb 14, 2019 6:25 pm
Forum: Phase Changes & Related Calculations
Topic: Phase Change Diagram of Water
Replies: 6
Views: 106

Re: Phase Change Diagram of Water

Because steam has to go through a phase transition while water doesn't as well as the fact that the enthalpy of condensation is very high, so more energy is released
by Kenan Kherallah 2C
Thu Feb 14, 2019 6:24 pm
Forum: Student Social/Study Group
Topic: workshop
Replies: 3
Views: 99

Re: workshop

I would assume that he wouldn't
by Kenan Kherallah 2C
Mon Feb 11, 2019 5:15 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 6662

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

For question 4, Im just wondering if the condition is temperature at zero or if the change (delta T) of temperature is zero so an isothermal condition?
by Kenan Kherallah 2C
Sat Feb 09, 2019 1:21 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 6662

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

For the last question, Do we use 0.15 moles from the previous question since I think we have to use moles in the last question
by Kenan Kherallah 2C
Sat Feb 09, 2019 11:35 am
Forum: Calculating Work of Expansion
Topic: Units
Replies: 7
Views: 100

Units

When we are calculating work with either constant pressure or not, do we always have to use units of atm? Can we use pascals or bar or should we convert?
by Kenan Kherallah 2C
Sat Feb 09, 2019 12:45 am
Forum: Calculating Work of Expansion
Topic: Heat Capacity at constant Volume Pressure?
Replies: 2
Views: 59

Re: Heat Capacity at constant Volume Pressure?

I'm not sure but its not as bad as what the textbook makes it look like: for constant volume its 3/2R, 5/2R, or 3R for atoms linear and then nonlinear molecules. For consant pressure its 5/2R, 7/2R, or 4R.
by Kenan Kherallah 2C
Fri Feb 08, 2019 11:24 am
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 6662

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

Jeannine 1I wrote:
005199302 wrote:for #6, shouldn't the work be -12.4kJ?

w=-PxdV = (-122atm/L)(101.33J/atmL) = -12.4kJ


Were you able to solve 6a? I've tried doing it but keep getting 12.85 kJ, but I don't see where it went wrong.

I got the same answer and online I saw that its right so I think you're correct
by Kenan Kherallah 2C
Fri Feb 08, 2019 10:59 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Practice Midterm
Replies: 3
Views: 100

Re: Practice Midterm

Not that I am aware of but I think by the weekend he should have something up
by Kenan Kherallah 2C
Mon Feb 04, 2019 5:46 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Residual Entropy
Replies: 3
Views: 52

Residual Entropy

What is the definition of it and how does it help us
by Kenan Kherallah 2C
Mon Feb 04, 2019 4:43 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: HW question
Replies: 1
Views: 66

HW question

Calculate the work that must be done against the atmosphere for the expansion of the gaseous products in the combustion of 1.00 mol C6H6(l) at 25 C and 1.00 bar. (b) Using data in Appendix 2A, calculate the standard enthalpy of the reaction. I just need the explanation as to why the answer in part a...
by Kenan Kherallah 2C
Sun Feb 03, 2019 4:48 pm
Forum: Phase Changes & Related Calculations
Topic: 8.21
Replies: 3
Views: 157

Re: 8.21

Make sure to put a negative for the exothermic reaction (this is a common mistake that I usually forget)
by Kenan Kherallah 2C
Mon Jan 28, 2019 9:59 am
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 6662

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

For question 5, do we have to have whole numbers in the balanced equation to use bond enthalpies or can we keep fractions in there (for this and other questions like this).
by Kenan Kherallah 2C
Sat Jan 26, 2019 7:27 pm
Forum: Naming
Topic: Regarding the test... [ENDORSED]
Replies: 12
Views: 3737

Re: Regarding the test... [ENDORSED]

Yes Kw is provided
by Kenan Kherallah 2C
Sat Jan 26, 2019 7:26 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 8.55
Replies: 1
Views: 37

8.55

Can someone give Lavelle's exact definition of state properties?
by Kenan Kherallah 2C
Sat Jan 19, 2019 11:18 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Multiple protonation or deprotonations
Replies: 1
Views: 96

Multiple protonation or deprotonations

WIll be tested on multiple protonations or deprotonation events. We haven't talked about it in class but it was included on questions 77 and 81 of the homework.
by Kenan Kherallah 2C
Fri Jan 18, 2019 12:29 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Buffers - weak acid
Replies: 4
Views: 75

Re: Buffers - weak acid

the buffer can be made by a weak base. Buffer solutions will not change in pH if there is a small change in the concentration of H+ or OH-. Hence, this means that a buffer solution must have a base and an acid component to react with either an added base or an added acid.
by Kenan Kherallah 2C
Fri Jan 18, 2019 12:27 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Initial Concentrations of ICE Box and 12.79 (6th Edition)
Replies: 3
Views: 495

Re: Initial Concentrations of ICE Box and 12.79 (6th Edition)

So just adding on to what Dimitri said, sulfuric acid is a diprotic acid and it is a strong acid for the first dissociation and a weak acid for the second. In the first dissociation the equation is H2SO4 +H20 --> HSO4- + H30+ . this would mean that the 0.15 M of H2SO4 has completely dissociated and ...
by Kenan Kherallah 2C
Sat Jan 12, 2019 3:46 pm
Forum: Ideal Gases
Topic: A bit of confusion
Replies: 3
Views: 75

A bit of confusion

I have two questions: the first is this one. Its included in the homework list of problems but I don't know of any way how to solve this with what we've learned in class. Does someone know if there is a way and if we should know how to do it? Use the information in Table 11.2 to determine the value ...
by Kenan Kherallah 2C
Fri Jan 11, 2019 11:14 am
Forum: Ideal Gases
Topic: Pressure of gasses
Replies: 5
Views: 119

Re: Pressure of gasses

I dont think we will be using this equation since he hasnt mentioned it in lecture and all HW problems are solvable without the equation.
by Kenan Kherallah 2C
Wed Jan 09, 2019 9:46 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: how to write the formula for K
Replies: 6
Views: 90

Re: how to write the formula for K

If they specify that they want Kp then you should write equilibrium constant in terms of partial pressures of the reactants and products. However, if you have substances that are not in the gaseous phase then you can't use Kp and must use Kc. If the book or the question doesn't specify whether Kc or...
by Kenan Kherallah 2C
Wed Jan 09, 2019 9:43 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Help with question 11.79
Replies: 1
Views: 39

Help with question 11.79

11.79 A reactor for the production of ammonia by the Haber process is found to be at equilibrium with PN2 3.11 bar, PH2 1.64 bar, and PNH3 23.72 bar. If the partial pressure of N2 is increased by 1.57 bar, what will be the partial pressure of each gas once equilibrium is re-established? I have no id...
by Kenan Kherallah 2C
Wed Jan 09, 2019 9:42 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Help with question 11.7
Replies: 2
Views: 52

Help with question 11.7

11.7 The following flasks show the dissociation of a diatomic molecule, X2, over time. (a) Which flask represents the point in time at which the reaction has reached equilibrium? (b) What percentage of the X2 molecules have decomposed at equilibrium? (c) Assuming that the initial pressure of X2 was ...
by Kenan Kherallah 2C
Wed Dec 05, 2018 5:37 pm
Forum: Administrative Questions and Class Announcements
Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
Replies: 118
Views: 4905

Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]

Hey guys can someone help me with question 21, I really dont know how to approach this since I just get a formal charge of +2 in total for the ligands which doesnt seem right
by Kenan Kherallah 2C
Mon Dec 03, 2018 2:55 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
Replies: 135
Views: 28247

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]

Im just wondering why the tail has a -1 charge since for me when I calculated the formal charges of the nitrogens connected to Co I got +1, +1, +1, +1, and 0
Wouldnt that give an overall +4 charge for the tail?
by Kenan Kherallah 2C
Mon Dec 03, 2018 1:51 am
Forum: Hybridization
Topic: Double and Triple Bonds
Replies: 17
Views: 203

Re: Double and Triple Bonds

No and this is also why for vsepr any resonance structure can be used
by Kenan Kherallah 2C
Mon Dec 03, 2018 1:50 am
Forum: Determining Molecular Shape (VSEPR)
Topic: AX3E
Replies: 18
Views: 273

Re: AX3E

It would be trigonal pyramidal since there is a lone pairs of electrons on the central atom in a tetrahedral arrangemen
by Kenan Kherallah 2C
Mon Dec 03, 2018 1:48 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 11
Views: 166

Re: Lone Pairs

Lone pairs repwl bonding pairs more than bonding pairs repel each other causing the bond angles to be smaller than usual.
by Kenan Kherallah 2C
Mon Dec 03, 2018 1:47 am
Forum: Hybridization
Topic: s character
Replies: 3
Views: 61

Re: s character

So sp1 has a 180 degree angle, sp2 has a 120 angle and sp3 has a 109.5 angle so as the s character decreases the angle will smaller. Therefore if it increases rhen the angle increases
by Kenan Kherallah 2C
Mon Dec 03, 2018 1:46 am
Forum: Determining Molecular Shape (VSEPR)
Topic: C6H4
Replies: 2
Views: 75

Re: C6H4

That's because they have a triple bond between them so they have 2 electron domains= sp1
by Kenan Kherallah 2C
Fri Nov 30, 2018 4:22 pm
Forum: Bronsted Acids & Bases
Topic: Help with question 12.127
Replies: 1
Views: 65

Help with question 12.127

The two strands of the nucleic acid DNA are held together by hydrogen bonding between four organic bases. The structure of one of these bases, thymine, is shown below. (a) How many protons can this base accept? (b) Draw the structure of each conjugate acid that can be formed. (c) Mark with an asteri...
by Kenan Kherallah 2C
Wed Nov 21, 2018 1:44 pm
Forum: Hybridization
Topic: Help with Confusion
Replies: 6
Views: 118

Help with Confusion

So for Test #3, my TA started drawing sigma and pi bonds but I remember that Lavelle said that we don't need to know how to do this, but my TA said that we do in fact need to know how to do this for test #3.

Is this true?
by Kenan Kherallah 2C
Wed Nov 21, 2018 1:42 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Difference between O2- and N3-
Replies: 3
Views: 116

Re: Difference between O2- and N3-

So N3- is more polarizable than O2- because N3- is actually larger than O2- as well as less electronegative. My TA said that the trends for polarizability is actually the larger the atom is and the less electronegative, the more polarizable it is. So I dont think the charge here matters, its just te...
by Kenan Kherallah 2C
Wed Nov 21, 2018 1:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Drawing out Molecular Shape
Replies: 3
Views: 79

Re: Drawing out Molecular Shape

I think you are referring to the dipole moment. I asked my TA this and she said she doesn't think so but it doesn't hurt to know it, especially for individual bond dipoles. For this, you just put the arrow to the more electronegative atom.
by Kenan Kherallah 2C
Sat Nov 17, 2018 4:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond angles
Replies: 5
Views: 71

Re: Bond angles

Yes we do not need to memorize only know that AX4 is a tetrahedral and AX4E is trigonal pyramidal, etc
by Kenan Kherallah 2C
Thu Nov 15, 2018 5:38 pm
Forum: Bond Lengths & Energies
Topic: bond energy clarification
Replies: 4
Views: 67

Re: bond energy clarification

The energy of the attractive forces
by Kenan Kherallah 2C
Sat Nov 10, 2018 4:49 pm
Forum: Lewis Structures
Topic: Molecule Shape
Replies: 8
Views: 166

Re: Molecule Shape

VSEPR also gives you structures based on experimentally observed results. Hence, the rules outlined in VSEPR will allow you to essentially represent structures in a 2-D manner.
by Kenan Kherallah 2C
Sat Nov 10, 2018 4:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test
Replies: 2
Views: 50

Test

Guys do you know if for the upcoming test if it is after or before thanksgiving. If its before, what happens if we dont have our discussion on that day due to break.
by Kenan Kherallah 2C
Sat Nov 10, 2018 4:45 pm
Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
Topic: Viscosity Picture?
Replies: 1
Views: 129

Re: Viscosity Picture?

I didnt but I wrote down that pentane was a mobile fluid, pentadecane was a viscous fluid and octadecane was a waxy fluid. I dont know if that helps though.
by Kenan Kherallah 2C
Sun Nov 04, 2018 8:37 pm
Forum: Octet Exceptions
Topic: Lewis acids and bases
Replies: 4
Views: 78

Re: Lewis acids and bases

The Lewis base is an electron pair donor and so it donates it's lonely pair to a Lewis acid which usually has an emptru orbital to take those electrons. So the Lewis acid is a electron pair acceptor and a dative bond is formed.
by Kenan Kherallah 2C
Sun Nov 04, 2018 8:36 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Exceptions to electron configuration
Replies: 3
Views: 59

Re: Exceptions to electron configuration

Just adding to what the person above said. Those exceptions also work for the elements below Cr and Cu (directly below).

Hope this helps!
by Kenan Kherallah 2C
Sun Nov 04, 2018 12:06 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
Replies: 135
Views: 28247

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]

Heyy I was wondering where I can find the answers for worksheet 5 (newest one)? Also for question 9 aren't there more than 2 ions that aren't isoelectronic with F-. I got 4 ions (Li+, Be2+,O-, N2-) that aren't isoelectronic.

Thanks!
by Kenan Kherallah 2C
Tue Oct 30, 2018 2:44 pm
Forum: Administrative Questions and Class Announcements
Topic: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
Replies: 121
Views: 5075

Re: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]

Does anyone know how to do question 13 a and b? I though I could do 13a but thirteen b said that what she did (which is what I did) was wrong.
by Kenan Kherallah 2C
Sat Oct 27, 2018 3:26 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 7
Views: 267

Re: Midterm

I think it will also cover everything we've been doing up to the midterm (fundamentals plus chapters 1 2 and 3) :).
by Kenan Kherallah 2C
Sat Oct 27, 2018 3:22 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Homework Question 1D.23
Replies: 2
Views: 69

Re: Homework Question 1D.23

to get the number of orbitals you use the formula: number of orbitals= nsquared (n being the principal quantum number). To get the number of electrons you just multiply nsquared by 2.
by Kenan Kherallah 2C
Sat Oct 27, 2018 3:21 pm
Forum: DeBroglie Equation
Topic: Homework Question 1B.15
Replies: 3
Views: 90

Re: Homework Question 1B.15

Im not sure about the first part of teh question but i can say that SI units are needed so meters per second should be used!
by Kenan Kherallah 2C
Sat Oct 27, 2018 3:20 pm
Forum: Photoelectric Effect
Topic: Frequency of light
Replies: 2
Views: 111

Re: Frequency of light

I believe there are few metallic surfaces that would emit electrons if visible light is used but the majority only get emitted if ultraviolet light is used
by Kenan Kherallah 2C
Thu Oct 18, 2018 11:16 am
Forum: Photoelectric Effect
Topic: wavelength
Replies: 1
Views: 57

Re: wavelength

Well since the question said that lines in the balmer series are observed, we can know that n1= 2 since the balmer series has a lower energy level of n=2 (visible light region). Furthermore, knowing this we can assume that 410.2 nm corresponds to n=3, 434 nm: corresponds to n=4, and so on. The next ...
by Kenan Kherallah 2C
Tue Oct 16, 2018 1:24 pm
Forum: Properties of Light
Topic: Help with Question 1.57
Replies: 2
Views: 53

Re: Help with Question 1.57

I'm still confused on how you were able to identify that those wavelengths correspond to those lines. Is there a table I should be looking at?
by Kenan Kherallah 2C
Tue Oct 16, 2018 1:22 pm
Forum: DeBroglie Equation
Topic: Velocity using de Broglie equation
Replies: 2
Views: 63

Re: Velocity using de Broglie equation

You also use p = h times wavelength ^-1 because this is the only particular way for us to get the desired units
by Kenan Kherallah 2C
Tue Oct 16, 2018 1:20 pm
Forum: Properties of Light
Topic: Measurable wavelength
Replies: 2
Views: 57

Re: Measurable wavelength

You could also kind of gage at the question as well. Large objects like a car or a lamp wont have a noticeable wavelength but at the atomic scale, electrons and neutrons and such will.
by Kenan Kherallah 2C
Thu Oct 11, 2018 2:50 pm
Forum: Properties of Electrons
Topic: Help with question 1.13
Replies: 2
Views: 56

Help with question 1.13

Use the Rydberg formula for atomic hydrogen to calculate the wavelength of radiation generated by the transition from n = 4 to n = 2. (b) What is the name given to the spectroscopic series to which this transition belongs? (c) Use Table 1.1 to determine the region of the spectrum in which the transi...
by Kenan Kherallah 2C
Thu Oct 11, 2018 2:47 pm
Forum: Properties of Light
Topic: frequency and electrical field
Replies: 1
Views: 49

Re: frequency and electrical field

Hello Jennifer, I think that if the frequency increases the extent of the change in the electric field also increases since increasing the frequency means that the radiation has an increase in energy (more oscillation and interaction with electrons). The opposite can be said if the frequency decreas...
by Kenan Kherallah 2C
Thu Oct 11, 2018 2:43 pm
Forum: Properties of Light
Topic: Help with Question 1.57
Replies: 2
Views: 53

Help with Question 1.57

I need help with the following question: Lines in the Balmer series of the hydrogen spectrum are observed at 656.3, 486.1, 434.0, and 410.2 nm. What is the wavelength of the next line in the series?

I get that n1=2 but what is n2? Thanks!
by Kenan Kherallah 2C
Tue Oct 02, 2018 3:06 pm
Forum: SI Units, Unit Conversions
Topic: State Symbols
Replies: 2
Views: 73

Re: State Symbols

In our last class, Dr. Lavelle said that it is required.
by Kenan Kherallah 2C
Tue Oct 02, 2018 3:04 pm
Forum: Significant Figures
Topic: Rules For Significant Figures
Replies: 6
Views: 152

Re: Rules For Significant Figures

I think explaining it would be better through examples. 1.0 has two sig figs 10 has one sig fig, so does 100, so does 2000. 2300 has two sig figs (so numbers before zeros count as sig figs). But if a decimal is placed then the zeros are significant e.g 2300. has 4 sig figs. 0.003 has one sig fig 0.0...
by Kenan Kherallah 2C
Tue Oct 02, 2018 3:00 pm
Forum: Student Social/Study Group
Topic: Anyone do G15 A?
Replies: 2
Views: 69

Re: Anyone do G15 A?

Hello,

So I would start by getting the moles of Na2CO3 needed. You would do this by 0.15 * 0.0234 M to get 0.00351.
By doing this you then have to solve for the volume of the concentration 0.778M. 0.00351/0.778 = 0.00451 L

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