Search found 101 matches
- Tue Mar 10, 2020 11:41 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Homework 10
- Replies: 11
- Views: 646
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: 1001
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.
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: 515
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: 248
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: 480
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: 2
- Views: 229
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: 521
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: 521
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: 1455
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: 468
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: 1555
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: 551
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: 257
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?
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: 263
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: 747
Re: how can you tell
https://m.youtube.com/watch?v=DrToRsXmjP4
The youtube video explains the difference useful to know when distinguish between thermodynamic and kinetic control.
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: 654
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: 1156
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: 399
Re: 6L Problems: oxidation and reduction
Hi this link is very useful in explaining the steps:
http://www.occc.edu/kmbailey/Chem1115Tu ... idized.htm
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: 9651
- Views: 3006277
- Tue Feb 25, 2020 10:49 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3006277
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: 9651
- Views: 3006277
Re: Post All Chemistry Jokes Here
I like to hear chemistry puns, periodically
It’s morning time, up and atom!
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: 9651
- Views: 3006277
- Tue Feb 25, 2020 10:47 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3006277
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: 1145
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: 233
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: 279
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: 2120
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: 661
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: 66
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: 300
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: 4096
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: 146
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: 114
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: 345
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: 266
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: 610
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: 376
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: 14
- Views: 907
Re: ideal gases
Ideal gas molecules do not attract or repel each other.
Ideal gas molecules themselves take up no volume.
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: 313
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: 857
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: 555
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: 109
- Views: 4382
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: 536
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
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: 2183
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: 363
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
- Topic: Quadratic
- Replies: 10
- Views: 252
Re: Quadratic
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: 133
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: 282
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: 1076
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: 449
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: 237
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: 500
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: 1029
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: 213
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: 58
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: 1061
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: 752
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: 235
Re: Names of ligands
https://lavelle.chem.ucla.edu/wp-conten ... pounds.pdf
Dr. Lavelle sent this link and it is very helpful.
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: 439
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: 187
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: 269
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: 193
Re: Naming Rules
https://lavelle.chem.ucla.edu/wp-conten ... pounds.pdf
Professor Lavelle emailed this list.
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: 1233
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: 424
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: 4044
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: 843
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: 125
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
- Topic: Class Grading
- Replies: 3
- Views: 238
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: 104
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: 352
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: 300
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: 2036
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: 446
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: 188
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: 2062
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: 109
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: 336
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: 107
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: 266
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: 98
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: 559
Ionization energy
Can someone please explain how ionization energy measured
- Sat Oct 26, 2019 1:02 pm
- Forum: Hybridization
- Topic: Electrons
- Replies: 13
- Views: 1224
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: 160
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: 222
Re: Electronegativity
Electronegativity: tendency of an atom to attract an electron
Ionization energy: required energy to remove an electron from an atom
Ionization energy: required energy to remove an electron from an atom
- Sat Oct 26, 2019 12:48 pm
- Forum: Trends in The Periodic Table
- Topic: ionic radius
- Replies: 3
- Views: 117
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: 204
Re: Exceptions for Electron Configuration
exceptions for electron configurations:
Cu-(Ar)3d^10 4s^1.
Cr-[Ar] 3d5 4s1
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: 289
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: 1583
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
- Topic: Advice
- Replies: 6
- Views: 336
Re: Advice
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: 819
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: 138
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: 136
Re: 1A.5
Increasing to decreasing:
Yrays
Xrays
Ultraviolet rays
Visible light
Microwaves
Yrays
Xrays
Ultraviolet rays
Visible light
Microwaves
- Sun Oct 13, 2019 3:32 pm
- Forum: Properties of Light
- Topic: 1A.5
- Replies: 3
- Views: 136
Re: 1A.5
Increasing to decreasing:
Yrays
Xrays
Ultraviolet rays
Visible light
Microwaves
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: 193
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: 143
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: 149
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?"
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: 231
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: 327
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: 298
- Views: 245048
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: 412
Re: Can someone tell me where I can access the Solutions Manual?
You can get a digital copy here:
https://ebookentry.com/product/chemical ... isEALw_wcB
https://ebookentry.com/product/chemical ... isEALw_wcB