## Search found 101 matches

Tue Mar 10, 2020 11:41 pm
Forum: Administrative Questions and Class Announcements
Topic: Homework 10
Replies: 11
Views: 125

### Re: Homework 10

Just email the picture to your TA to get points for your 5 questions
Tue Mar 10, 2020 11:39 pm
Forum: Administrative Questions and Class Announcements
Topic: What is the plan for the final?
Replies: 16
Views: 255

### Re: What is the plan for the final?

"The three-hour closed-book exam that was scheduled for Sunday is also cancelled.

In its place will be a short, straightforward, open-book, take-home final posted on my class website. " according to his mew email.
Tue Mar 10, 2020 11:38 pm
Forum: Administrative Questions and Class Announcements
Topic: review sessions and office hours
Replies: 6
Views: 117

### Re: review sessions and office hours

As professor lavelle's email said all the review sessions and office hours are cancelled
Tue Mar 10, 2020 6:25 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Using Equilibrium constants to predict solubility
Replies: 4
Views: 52

### Re: Using Equilibrium constants to predict solubility

The email will probably be sent out tonight so we can know what to do
Tue Mar 10, 2020 1:17 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Intermediate
Replies: 3
Views: 55

### Intermediate

How do you determine how many intermediates must form based on a reaction profile and the number of mechanism steps
Tue Mar 10, 2020 1:13 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: 7.11
Replies: 1
Views: 43

### 7.11

The rate law of the reaction 2 NO(g) 1 2 H2(g) S N2(g) 1 2 H2O(g) is Rate 5 kr[NO]2[H2], and the mechanism that has been proposed is 21 21 21 , the rate of the reaction is 1.21 mmol?L s . The Potential energy Step 1 NO1NO¡N2O2 Step 2 N2O2 1H2 ¡N2O1H2O A Step 3 N2O1H2 ¡N2 1H2O (a) Whichstepinthemecha...
Fri Mar 06, 2020 1:29 pm
Forum: General Rate Laws
Topic: units
Replies: 9
Views: 86

### Re: units

”The units of a reaction rate are concentration/time. This is most often M / s, where M is molarity (moles per liter) and s is time in seconds.”
Fri Mar 06, 2020 1:29 pm
Forum: General Rate Laws
Topic: units
Replies: 9
Views: 86

### Re: units

”The units of a reaction rate are concentration/time. This is most often M / s, where M is molarity (moles per liter) and s is time in seconds.”
Fri Mar 06, 2020 1:25 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Calculating ln Q
Replies: 20
Views: 221

### Re: Calculating ln Q

Q is the concentration of product over reactant in other words for galvanic cells we can write q as the concentration of anode over that of the cathode.
Fri Mar 06, 2020 1:24 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: thermodynamically stable
Replies: 6
Views: 82

### Re: thermodynamically stable

Kinetic stability basically occurs when the reactants react really slowly. The slower the reaction occurs, the greater the kinetic stability. If you say, "This reaction is kinetically stable," then that implies that the reaction occurs very slowly. Thermodynamic stability depends on wheth...
Fri Mar 06, 2020 1:21 pm
Forum: General Science Questions
Topic: Test 2 Grades [ENDORSED]
Replies: 23
Views: 538

### Re: Test 2 Grades[ENDORSED]

You will be handed back your test in discussion the following week but your TA might put the score online before handing it back.
Thu Mar 05, 2020 11:06 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Half/Rxn & Balanced Equations for galvanic cells.
Replies: 8
Views: 80

### Re: Half/Rxn & Balanced Equations for galvanic cells.

Does anyone know how to write half reactions when reducing and oxidizing agent is the same
Wed Mar 04, 2020 11:05 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: 6n.21
Replies: 1
Views: 55

### 6n.21

Can anyone explain this question to me:
What is the approximate chemical formula of rust? (b) What is the oxidizing agent in the formation of rust? (c) How does the presence of salt accelerate the rusting process?
Sun Mar 01, 2020 4:41 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: precipitation reactions
Replies: 3
Views: 40

### Re: precipitation reactions

"A precipitation reaction refers to the formation of an insoluble salt when two solutions containing soluble salts are combined. The insoluble salt that falls out of solution is known as the precipitate, hence the reaction’s name"
Sun Mar 01, 2020 4:39 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: how can you tell
Replies: 11
Views: 146

### Re: how can you tell

The youtube video explains the difference useful to know when distinguish between thermodynamic and kinetic control.
Sun Mar 01, 2020 4:37 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: salt bridge
Replies: 11
Views: 97

### Re: salt bridge

Maintain charge balance and connect the oxidation and reduction half-cells
Sun Mar 01, 2020 4:35 pm
Forum: Zero Order Reactions
Topic: Deriving Equations
Replies: 7
Views: 605

### Re: Deriving Equations

The equation sheet given on the test mostly has the equations needed but sometimes you need to be able to rearrange them in order to get your desired formula .
Sun Mar 01, 2020 4:31 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6L Problems: oxidation and reduction
Replies: 5
Views: 55

### Re: 6L Problems: oxidation and reduction

Hi this link is very useful in explaining the steps:
http://www.occc.edu/kmbailey/Chem1115Tu ... idized.htm
Tue Feb 25, 2020 10:50 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8023
Views: 1406972

### Re: Post All Chemistry Jokes Here

Photon
Tue Feb 25, 2020 10:49 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8023
Views: 1406972

### Re: Post All Chemistry Jokes Here

Attached
Tue Feb 25, 2020 10:48 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8023
Views: 1406972

### Re: Post All Chemistry Jokes Here

I like to hear chemistry puns, periodically

It’s morning time, up and atom!
Tue Feb 25, 2020 10:47 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8023
Views: 1406972

### Re: Post All Chemistry Jokes Here

Wow
Tue Feb 25, 2020 10:47 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8023
Views: 1406972

### Re: Post All Chemistry Jokes Here

Reactions
Thu Feb 13, 2020 8:59 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Spontaneous
Replies: 23
Views: 355

### Re: Spontaneous

If our delta g is negative then the reaction is spontaneous in the forward direction.
Thu Feb 13, 2020 8:57 am
Forum: Calculating Work of Expansion
Topic: 4.43b) STP vs SATP?
Replies: 2
Views: 59

### Re: 4.43b) STP vs SATP?

For that question you have to just use STP as illustrated in the solution manual
Thu Feb 13, 2020 8:54 am
Forum: Calculating Work of Expansion
Topic: Work for an isothermal reversible expansion
Replies: 3
Views: 76

### Re: Work for an isothermal reversible expansion

You can use the the ideal gas law to utilize PV instead of nRT in the case that the question only gives you the volume and pressure
Thu Feb 13, 2020 8:51 am
Forum: Calculating Work of Expansion
Topic: Positive or negative work
Replies: 15
Views: 252

### Re: Positive or negative work

When work is done on the system it is positive and when work is done by the system it is negative
Thu Feb 13, 2020 8:50 am
Forum: Student Social/Study Group
Topic: Midterm
Replies: 8
Views: 342

### Midterm

Does anyone know which homework problem was on the midterm?
Mon Feb 10, 2020 1:44 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Q and deltah
Replies: 1
Views: 24

### Q and deltah

When is deltah equal to q and when can we put q equal to deltah
Fri Feb 07, 2020 7:02 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 1 Distribution
Replies: 9
Views: 136

### Re: Test 1 Distribution

we don't get averages or distribution curve sf or the tests in this class but we will be given the averages on the midterm and final
Fri Feb 07, 2020 7:00 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated vs Closed [ENDORSED]
Replies: 34
Views: 725

### Re: Isolated vs Closed[ENDORSED]

in a closed system, the matter is constant yet energy can be exchanged with the surroundings whereas in the isolated system neither matter nor energy is exchanged.
Fri Feb 07, 2020 6:59 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: hw problem 4D 7 assuming T?
Replies: 3
Views: 34

### Re: hw problem 4D 7 assuming T?

since the question does not explicitly give the temorature we can assume in its ideal state that the temprature conditions are STP (298K)
Fri Feb 07, 2020 6:57 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Step-Up Session Worksheet from 2/4 from 6-8pm Q2B
Replies: 2
Views: 61

### Re: Step-Up Session Worksheet from 2/4 from 6-8pm Q2B

hello, does anyone know where I can find pictures of the worksheet from this step up session
Fri Feb 07, 2020 6:56 pm
Forum: Phase Changes & Related Calculations
Topic: Homework 4C 13
Replies: 7
Views: 95

### Re: Homework 4C 13

the heat lost by the ice is equal to negative the heat gained by the water. so the sign would go to water in liquid form.
Fri Feb 07, 2020 6:54 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Midterm Equations
Replies: 4
Views: 48

### Re: Midterm Equations

the equation sheet on the midterm is similar to the on test 1 so you should memorize the ones used for the homework problems but not stated on the sheet.
Fri Jan 31, 2020 7:23 pm
Forum: Student Social/Study Group
Topic: Any Worksheets from UA/TA/etc?
Replies: 14
Views: 286

### Re: Any Worksheets from UA/TA/etc?

In most of the workshops the ua's give out practice worksheets I recommend checking out the monday workshop
Fri Jan 31, 2020 7:22 pm
Forum: Ideal Gases
Topic: Determining N
Replies: 9
Views: 115

### Re: Determining N

Since we are talking about the ideal gas equation the n would be moles of our gas
Fri Jan 31, 2020 7:21 pm
Forum: Ideal Gases
Topic: ideal gases
Replies: 13
Views: 284

### Re: ideal gases

Ideal gas molecules do not attract or repel each other.

Ideal gas molecules themselves take up no volume.
Fri Jan 31, 2020 7:19 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Test 1 # 4
Replies: 10
Views: 111

### Re: Test 1 # 4

Use pV=nrt when plugged in you will then need to calculte the grams from the moles found using the equation
Fri Jan 31, 2020 7:18 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE
Replies: 20
Views: 173

### Re: ICE

When asked to calculate the equilibrium concentrations of the products or the reactants of a reaction we use the ICE table
Thu Jan 23, 2020 2:55 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: pKa to Kb
Replies: 12
Views: 133

### Re: pKa to Kb

You can go from pka to ka by taking 10 to the power of negative pka and when you found ka you can easily divide 10 to the power of negative 14 by ka to get kb
Thu Jan 23, 2020 2:52 pm
Forum: Ideal Gases
Topic: Kc vs Kp
Replies: 43
Views: 512

### Re: Kc vs Kp

You can use kp when the reactants and products are gases and the partial pressures of the gases are given rather than their concentrations
Thu Jan 23, 2020 2:51 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ice table
Replies: 13
Views: 84

### Re: ice table

No
Since solids and liquids are not written in the k expression we don't need to include them in the ice tables
Thu Jan 23, 2020 2:50 pm
Forum: Student Social/Study Group
Topic: midterm/final
Replies: 12
Views: 177

### Re: midterm/final

The tests are more like the homework problem whereas the midterm and final have more conceptual questions
Thu Jan 23, 2020 2:49 pm
Forum: Ideal Gases
Topic: test 1
Replies: 9
Views: 106

### Re: test 1

Test one only includes outlines 1 and 2 which include the chemical equilibrium and the acid and base information from this quarter
Fri Jan 17, 2020 5:02 pm
Forum: Equilibrium Constants & Calculating Concentrations
Replies: 10
Views: 94

You will test out the two answers and the answer that is less than the initial answer will be the correct one
Fri Jan 17, 2020 5:00 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE
Replies: 5
Views: 76

### Re: ICE

ICE tables are used when the problem is only providing the initial concentrations and we are trying to find the ph or ooh of weak acids or bases
Fri Jan 17, 2020 4:59 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc & Kp
Replies: 12
Views: 108

### Re: Kc & Kp

We use kc when we are dealing with concentrations but we only use kp when we are dealing with partial pressures of gases.
Fri Jan 17, 2020 4:58 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Tips for Test
Replies: 23
Views: 263

### Re: Tips for Test

I think the best tip would be to do as many of the homework problems as possible to better understand the material and test yourself on all the material covered in lectures
Fri Jan 17, 2020 4:57 pm
Forum: General Science Questions
Topic: Test 1 [ENDORSED]
Replies: 13
Views: 180

### Re: Test 1[ENDORSED]

Test one starts this week in discussion sections starting on Tuesday. The test will cover the first two outlines on dr Lavelle's chem 14b website.
Fri Jan 10, 2020 1:27 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Units for K
Replies: 10
Views: 84

### Re: Units for K

Since k is a ratio constant the units of the products and reactants concentration cancel out making k a unitless constant.
Fri Jan 10, 2020 1:26 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Change in k
Replies: 11
Views: 190

### Change in k

How is it that a change in concentration does not change the value of k?
Fri Jan 10, 2020 1:24 pm
Forum: Ideal Gases
Topic: pressure [ENDORSED]
Replies: 13
Views: 324

### Re: pressure[ENDORSED]

Yes, this is easily proven using the ideal gas law pv=nRT
Fri Jan 10, 2020 1:22 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Value of K
Replies: 4
Views: 51

### Re: Value of K

Since K is a ratio the threshold would depend on the molar ratio of the products and reactants given in the reaction.
Fri Jan 10, 2020 1:20 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Calculating eq with percentages of reaction
Replies: 3
Views: 20

### Re: Calculating eq with percentages of reaction

When given percentages you can easily find the moles of the products and reactants. From there you can calculate the molarity and concentration and plug it into the Kc formula to calculate the equilibrium constant of the reaction.
Sun Dec 01, 2019 2:40 pm
Forum: Naming
Topic: Final Exam?
Replies: 20
Views: 248

### Re: Final Exam?

it is a cumulative final from all of the 6 outlines: Outline 1: Review of Chemical & Physical Principles Outline 2: The Quantum World Outline 3: Chemical Bonds Outline 4: Molecular Shape and Structure Outline 5: Coordination Compounds and Their Biological Importance Outline 6: Acid and Base Stru...
Sun Dec 01, 2019 2:39 pm
Forum: Lewis Acids & Bases
Topic: Define Acid and Base
Replies: 7
Views: 84

### Re: Define Acid and Base

I attached a helpful summary of the definitions
Sun Dec 01, 2019 2:36 pm
Forum: Naming
Topic: Names of ligands
Replies: 4
Views: 46

### Re: Names of ligands

https://lavelle.chem.ucla.edu/wp-conten ... pounds.pdf
Dr. Lavelle sent this link and it is very helpful.
Sun Dec 01, 2019 2:34 pm
Forum: Bronsted Acids & Bases
Topic: Distinguishing between Strong and Weak Acids/Bases
Replies: 7
Views: 93

### Re: Distinguishing between Strong and Weak Acids/Bases

I think we only need to memorize the strong acids and bases outlined in the table from the fundamentals section J.
Sun Dec 01, 2019 2:30 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: question 6.A
Replies: 1
Views: 62

### question 6.A

can someone please explain how to do part b and c of this homework problem? 6A.9 Which of the following can be classified as reactions between Brønsted acids and bases? For those that can be so classified, identify the acid and the base. (Hint: It might help to write the net ionic equations.) (b) NH...
Sun Nov 24, 2019 12:22 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Identifying Polydentate Ligands
Replies: 5
Views: 47

### Re: Identifying Polydentate Ligands

A polydentate ligand has prefixes that indicate the number of donor atoms and more than 2 lewis base sites, such as lone pair donating sites used to bond to a central atom or ion.
Sun Nov 24, 2019 12:18 pm
Forum: Naming
Topic: Naming Rules
Replies: 2
Views: 54

### Re: Naming Rules

https://lavelle.chem.ucla.edu/wp-conten ... pounds.pdf
Professor Lavelle emailed this list.
Sun Nov 24, 2019 12:07 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angle of bent
Replies: 17
Views: 242

### Re: Bond Angle of bent

look at it as a trigonal planar shape with a lone pair instead of an atom, therefore, making a bond of less than 120 degrees.
Sun Nov 24, 2019 12:04 pm
Forum: General Science Questions
Topic: Sig Figs
Replies: 7
Views: 131

### Re: Sig Figs

you can lose 1-2 points for the wrong number of sig figs.
Sun Nov 24, 2019 12:01 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent vs linear
Replies: 56
Views: 1129

### Re: Bent vs linear

the bent shape has 1-2 lone pairs whereas linear has 0 0r 3 in the case of I3.
Sat Nov 16, 2019 2:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining if a molecule is polar or non polar
Replies: 9
Views: 260

### Re: Determining if a molecule is polar or non polar

when determining the polarity we only need to take into account the electronegativity trends in the periodic table, therefore, don't need to memorize exact values.
Sat Nov 16, 2019 2:29 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: Hydrogen Bonding
Replies: 5
Views: 51

### Re: Hydrogen Bonding

Hydrogen bonding is a special type of dipole-dipole in which one of the atoms is hydrogen, is covalently bonded to an electronegative atom, such as oxygen, chlorine, or fluorine.
Sat Nov 16, 2019 2:25 pm
Forum: Administrative Questions and Class Announcements
Replies: 3
Views: 68

### Re: Class Grading

according to the syllabus "Each test and exam has a total score but is not assigned a grade. Only at the end of the class when the class average score (out of 500 points) is known are final grades assigned. This class does not use a curve".
Sat Nov 16, 2019 2:21 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSPER Formula
Replies: 2
Views: 33

### Re: VSPER Formula

I think he will most likely give us a compound and ask us to identify its shape.
Thu Nov 07, 2019 10:48 am
Forum: Formal Charge and Oxidation Numbers
Topic: Do higher electronegativity atoms tend to draw more electrons to them?
Replies: 6
Views: 89

### Re: Do higher electronegativity atoms tend to draw more electrons to them?

Yes because electronegativity describes the tendency of an atom to attract a pair of electrons making it more negative.
Thu Nov 07, 2019 10:45 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Bohr Frequency
Replies: 6
Views: 173

### Re: Bohr Frequency

When energy is absorbed the delta E is positive therefore goes from lower n to higher n.
Thu Nov 07, 2019 10:38 am
Forum: Electronegativity
Topic: Trend of Electronegativity
Replies: 22
Views: 417

### Re: Trend of Electronegativity

The trend for electronegativity is the same for the trend in atomic spectra and ionization energy with some exceptions. It increases from right to left and decreases from up to down a group.
Thu Nov 07, 2019 10:36 am
Forum: Photoelectric Effect
Topic: Intensity in Photoelectric Effect
Replies: 6
Views: 223

### Re: Intensity in Photoelectric Effect

Electrons will only be emitted if the energy of a photon reaches a certain threshold of energy. Therefore increasing the intensity will have no impact on the energy of the phon and rather the increase in frequency will increase the energy of photon therefore ejecting more electrons. This proves the ...
Thu Nov 07, 2019 10:30 am
Forum: Electronegativity
Topic: Karen's worksheet #12
Replies: 3
Views: 81

### Re: Karen's worksheet #12

C O is more polar because of the greater difference in electronegativity
Thu Nov 07, 2019 10:23 am
Forum: Bond Lengths & Energies
Topic: Test 2 Topics
Replies: 40
Views: 832

### Re: Test 2 Topics

Test 2 will cover what we went over in class in outline 2 but was excluded from the midterm + what we learn after the midterm up to the test
Sun Nov 03, 2019 5:03 pm
Forum: Coordinate Covalent Bonds
Topic: coordinate covalent bond
Replies: 2
Views: 42

### Re: coordinate covalent bond

covalent bond: both atoms are involved in the formation of bond. coordination bond: only one atom is involved.
Sun Nov 03, 2019 5:01 pm
Forum: Bond Lengths & Energies
Topic: Midterm Question
Replies: 5
Views: 84

### Re: Midterm Question

the midterm is to topic 2d and according to the outline we have to be able to "List the factors affecting the covalent bond length and explain the effect of each".
Sun Nov 03, 2019 4:57 pm
Forum: Administrative Questions and Class Announcements
Topic: Homework Due this week
Replies: 2
Views: 40

### Re: Homework Due this week

I think as long as the practice problems relate to what is being taught in lectures then it'll be sufficient for the homework.
Sun Nov 03, 2019 4:55 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: paul and hundd rules
Replies: 4
Views: 83

### Re: paul and hundd rules

yes we need to know them because one of the questions on the dino nuggets midterm review sheet asked which rules were not being followed and you had to know the rules in order to answer the questions.
Sun Nov 03, 2019 4:48 pm
Forum: Administrative Questions and Class Announcements
Topic: TOPICS for Midterm help
Replies: 2
Views: 36

### Re: TOPICS for Midterm help

the midterm will cover outline 1 (fundamentals, covered in test 1) and 2(the quantum world) completely and outline 3 (chemical bonds) up to topic 2d.
Sat Oct 26, 2019 1:05 pm
Forum: Trends in The Periodic Table
Topic: Ionization energy
Replies: 12
Views: 199

### Ionization energy

Can someone please explain how ionization energy measured
Sat Oct 26, 2019 1:02 pm
Forum: Hybridization
Topic: Electrons
Replies: 13
Views: 609

### Re: Electrons

electron is promoted when it absorbs a photon to jump from a low energy level orbital to a higher energy level orbital
Sat Oct 26, 2019 12:57 pm
Forum: Formal Charge and Oxidation Numbers
Topic: FC in lecture
Replies: 4
Views: 80

### Re: FC in lecture

Delocalization increases stability by resonance because it increases the bonding between atoms and spreads energy over a larger area.
Sat Oct 26, 2019 12:53 pm
Forum: Ionic & Covalent Bonds
Topic: Electronegativity
Replies: 4
Views: 69

### Re: Electronegativity

Electronegativity: tendency of an atom to attract an electron
Ionization energy: required energy to remove an electron from an atom
Sat Oct 26, 2019 12:48 pm
Forum: Trends in The Periodic Table
Replies: 3
Views: 35

### Re: ionic radius

The ionic radius is half the distance between atomic ions in a crystal lattice and follows trends in the periodic table.
Sun Oct 20, 2019 2:30 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Exceptions for Electron Configuration
Replies: 6
Views: 53

### Re: Exceptions for Electron Configuration

exceptions for electron configurations:
Cu-(Ar)3d^10 4s^1.
Cr-[Ar] 3d5 4s1
Sun Oct 20, 2019 2:27 pm
Forum: DeBroglie Equation
Topic: Mass of electron and photon
Replies: 5
Views: 101

### Re: Mass of electron and photon

memorization is not required and professor Lavelle will give us the required information on each test.
Sun Oct 20, 2019 2:24 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice on Homework
Replies: 13
Views: 234

### Re: Advice on Homework

I think even though we are only obliged to do 5 questions it would be better in the long run if we looked at at least half of the fundamental questions professor outline on the class website.
Sun Oct 20, 2019 2:22 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Replies: 6
Views: 132

I found the pre/post assessment questions to be very helpful also professor Lavelle outlined the important questions in the textbook that correspond to the topics he discussed in class.
Sun Oct 20, 2019 2:20 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: how to prepare
Replies: 22
Views: 237

### Re: how to prepare

I suggest finding a group of people you are comfortable with and make a study group. just remember everyone gets stressed but college is the time to conquer your fears.
Sun Oct 13, 2019 3:40 pm
Forum: Properties of Light
Topic: 1A.9
Replies: 5
Views: 64

### Re: 1A.9

The energy of a photon is equal to Planck's constant multiplied by the frequency of light. E = hf
Sun Oct 13, 2019 3:32 pm
Forum: Properties of Light
Topic: 1A.5
Replies: 3
Views: 48

### Re: 1A.5

Increasing to decreasing:
Yrays
Xrays
Ultraviolet rays
Visible light
Microwaves
Sun Oct 13, 2019 3:32 pm
Forum: Properties of Light
Topic: 1A.5
Replies: 3
Views: 48

### Re: 1A.5

Increasing to decreasing:
Yrays
Xrays
Ultraviolet rays
Visible light
Microwaves
Sun Oct 13, 2019 3:20 pm
Forum: Properties of Light
Topic: Photon vs Wave Model
Replies: 5
Views: 68

### Re: Photon vs Wave Model

The frequency (number of waves per second) of a photon determines its energy whereas the number of photons determines the intensity of light.
Fri Oct 11, 2019 5:48 pm
Forum: DeBroglie Equation
Topic: q 34
Replies: 1
Views: 38

### q 34

how do we determine is our answer is reasonable in "If an electron (mass 9.11 x 10-31 kg) has an associated wavelength of 7.28 x 10-9 m, what is its speed? Is your answer reasonable, why?'
Fri Oct 11, 2019 5:46 pm
Forum: DeBroglie Equation
Topic: q 24
Replies: 2
Views: 47

### q 24

can someone explain this question to me "When neutrons pass through a crystal is a diffraction pattern observed?
What does this experiment tell us about neutrons?"
Tue Oct 01, 2019 8:10 pm
Forum: Administrative Questions and Class Announcements
Topic: Test #1
Replies: 3
Views: 115

### Re: Test #1

Hello does anyone know whether our first test is multiple choice or free response?
Tue Oct 01, 2019 7:56 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Calculation of Mass of One Molecule
Replies: 3
Views: 90

### Re: Calculation of Mass of One Molecule

The mass of one mole of water is equal to 2 times the molar mass of hydrogen (2x1.008 g) plus the molar mass of oxygen (16 g) which is equal to 18.016 g. 1 mole of water is equal to 6.022 x 10^23 molecules so to find the molar mass of one molecule of water all you need to do is divide 18.016 by (6.0...
Tue Oct 01, 2019 7:40 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student - Part II [ENDORSED]
Replies: 176
Views: 13434

### Re: Advice from a Medical Student - Part II[ENDORSED]

As a confused incoming freshman hoping to pursue the pre health route, this is truly inspiring. Tahnk you for sharing.
Tue Oct 01, 2019 7:38 pm
Forum: SI Units, Unit Conversions
Topic: Can someone tell me where I can access the Solutions Manual?
Replies: 6
Views: 133

### Re: Can someone tell me where I can access the Solutions Manual?

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