Search found 56 matches
- Mon Mar 11, 2019 4:10 pm
- Forum: Second Order Reactions
- Topic: 2nd order
- Replies: 4
- Views: 532
Re: 2nd order
Since the graph is 1/A v time and when you integrate that you'll get 1/[A] = kt + 1/[A]o, and when you plot 1/[A] against t you'll get a positive slope because k is positive
- Mon Mar 11, 2019 3:59 pm
- Forum: First Order Reactions
- Topic: First order rxn graphs [ENDORSED]
- Replies: 4
- Views: 498
Re: First order rxn graphs [ENDORSED]
Zero order is A v. time with a slope of -K
First order is ln A v. time with a slope of -K
Second order is 1/A v. time with a slope of K
First order is ln A v. time with a slope of -K
Second order is 1/A v. time with a slope of K
- Mon Mar 11, 2019 3:56 pm
- Forum: Student Social/Study Group
- Topic: Review session
- Replies: 5
- Views: 1004
Re: Review session
I believe he Lyndon is having its regular session because Lavelle says its all the normal sessions on top of the new ones for the final
- Mon Mar 11, 2019 3:54 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Work done vs work on system
- Replies: 18
- Views: 3826
Re: Work done vs work on system
When the system is doing work it loses energy which makes it negative, while if the system has work done on it it gains energy and its a positive value.
- Mon Mar 11, 2019 3:51 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: E˚ vs E
- Replies: 13
- Views: 15308
Re: E˚ vs E
E naut is for standard conditions while E is for non standard conditions
- Mon Mar 11, 2019 3:50 pm
- Forum: Balancing Redox Reactions
- Topic: Test #2
- Replies: 10
- Views: 1085
Re: Test #2
How do we find out which two to pair in order to get the greatest Gibbs difference it was the last part of this question.
- Mon Mar 11, 2019 3:46 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Formulas
- Replies: 6
- Views: 614
Re: Formulas
The equations depends on what is given, but all the formulas are given on the front sheet and those that aren't given you can derive
- Mon Mar 11, 2019 3:43 pm
- Forum: Second Order Reactions
- Topic: Final
- Replies: 32
- Views: 2314
Re: Final
The test is cumulative but it will emphasize on new topics after test 2, but everything will be on the test.
- Mon Mar 11, 2019 3:41 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 18
- Views: 1991
Re: Final
The majority of the stuff on the final is going to focus on the newer topic but still have the stuff from the first tests
- Mon Mar 11, 2019 3:39 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: "Bottle Neck"
- Replies: 2
- Views: 322
Re: "Bottle Neck"
Bottleneck is when the step prior to the first step before the slow one is at equilibrium. If the first one is fast then the second one is slow there will be a buildup of products which means the reaction will go back
- Mon Mar 11, 2019 3:35 pm
- Forum: Student Social/Study Group
- Topic: Note Taking
- Replies: 145
- Views: 15402
Re: Note Taking
Honestly handwritten notes are the best because one will need to put notations and sometimes google takes to long
- Mon Mar 11, 2019 3:32 pm
- Forum: Second Order Reactions
- Topic: Units
- Replies: 4
- Views: 527
Re: Units
The unit is 1/Mol(second)
- Mon Mar 11, 2019 3:30 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Final Exam
- Replies: 23
- Views: 1755
Re: Final Exam
Yes the final will be cumulative with an emphasis on the new topics that weren't on the tests.
- Mon Mar 11, 2019 3:29 pm
- Forum: *Electrophiles
- Topic: final
- Replies: 7
- Views: 1847
Re: final
The focus is on the recent stuff, but the last two tests will be covered too but it all will be on the test
- Mon Mar 04, 2019 1:13 pm
- Forum: Van't Hoff Equation
- Topic: K value- Temp
- Replies: 6
- Views: 993
Re: K value- Temp
When temperature changes a reaction will either favor reactants or products more which means K will change.
- Mon Mar 04, 2019 1:10 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Study Advice
- Replies: 73
- Views: 6811
Re: Study Advice
I like Lyndons then I like the step up sessions because they are very helpful and allow us to learn things all over again.
- Mon Mar 04, 2019 1:06 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Test #2
- Replies: 2
- Views: 441
Re: Test #2
There is an equation on the equations sheet that had both initial temperature as well as the second temperature. You would plug in the information to find the H+ concentration.
- Mon Feb 11, 2019 11:11 am
- Forum: Ideal Gases
- Topic: pH and pOH
- Replies: 18
- Views: 1905
Re: pH and pOH
If it doesn’t say specifically look at the products as OH would be pOh and H3O would be pH, sometimes it will tell you specifically
- Mon Feb 11, 2019 11:08 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Midterm 2019
- Replies: 9
- Views: 866
Re: Midterm 2019
To the end of entropy so we end right before Gibbs Free Energy
- Mon Feb 11, 2019 11:07 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Converting Celsius to Kelvin
- Replies: 7
- Views: 673
Re: Converting Celsius to Kelvin
You can use 273 because it is an estimation but make sure you use sig figs
- Mon Feb 04, 2019 11:09 am
- Forum: Calculating Work of Expansion
- Topic: Units for pressure
- Replies: 10
- Views: 739
Re: Units for pressure
You would preferably use atm but using bar is okay bc the difference between atm and bar is so small
- Mon Feb 04, 2019 11:08 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: kJ vs J
- Replies: 9
- Views: 792
Re: kJ vs J
Just make sure you do the conversion correctly as 1kJ = 1000J and whatever you put the answer in is fine
- Mon Feb 04, 2019 11:05 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Material on Midterm?
- Replies: 9
- Views: 843
Re: Material on Midterm?
It goes until the end of enthropy, you will have enough time to learn the topics because Lavelle teaches at a good pace
- Wed Jan 16, 2019 4:00 pm
- Forum: Ideal Gases
- Topic: Water
- Replies: 13
- Views: 1049
Re: Water
There are some cases where water can be a gas or a solid, but it will not be considered aqueous because it cannot be mixed with more water since it already is water.
- Wed Jan 16, 2019 3:58 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Exothermic vs. Endothermic Reaction
- Replies: 9
- Views: 3176
Re: Exothermic vs. Endothermic Reaction
When a reaction gives off heat it is exothermic, but when a reaction requires heat it is endothermic. SO for a reaction the be exothermic the change in H must be less than than 0. For a reaction to be endothermic the change in H is greater than 0.
- Wed Jan 16, 2019 3:57 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Negative pH
- Replies: 12
- Views: 1523
Re: Negative pH
Yes a pH can be negative and these are known as superacids, but we will most likely not be dealing with them.
- Wed Jan 09, 2019 4:16 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Audio Visual Topics
- Replies: 1
- Views: 238
Re: Audio Visual Topics
They are not due but they are recommended for extra help. You can do it when you think it would be most beneficial
- Wed Jan 09, 2019 4:15 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K and Kc
- Replies: 8
- Views: 552
Re: K and Kc
K and Kc are the same thing but K can also represent Kp
- Wed Jan 09, 2019 4:14 pm
- Forum: Ideal Gases
- Topic: K values
- Replies: 3
- Views: 291
Re: K values
If it is in between 10^-3 and 10^3 then neither are favored
- Sun Dec 09, 2018 10:53 pm
- Forum: Ionic & Covalent Bonds
- Topic: boiling point
- Replies: 3
- Views: 568
Re: boiling point
The stronger the bond the higher the boiling point
- Sun Dec 09, 2018 10:48 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: tetrahedral or square planar?
- Replies: 5
- Views: 877
Re: tetrahedral or square planar?
Tetrahedral is 440 4 bombs while square planar is 651 meaning 4 bonds and 2 lone pair
- Sun Dec 09, 2018 10:45 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Grade View
- Replies: 7
- Views: 912
Re: Final Grade View
It depends how fast your TA gets it in the system but probably 1-2 weeks
- Sun Dec 09, 2018 10:45 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Acid Rain
- Replies: 2
- Views: 507
Re: Acid Rain
So2+H20= H2SO3
- Sun Dec 09, 2018 10:38 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: AX3E
- Replies: 18
- Views: 3250
Re: AX3E
Trigonal pyramidal because the lone pairs move the bonds closer together
- Sun Dec 09, 2018 3:34 pm
- Forum: Conjugate Acids & Bases
- Topic: Conjugate Bases
- Replies: 7
- Views: 2572
Re: Conjugate Bases
A conjugate base of an acid would be the acid minus one hydrogen, and a conjugate acid of a base is if you add a hydrogen
- Fri Dec 07, 2018 9:43 pm
- Forum: Administrative Questions and Class Announcements
- Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
- Replies: 118
- Views: 21036
Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
Thanks! When are the answers going to be posted?
- Tue Nov 27, 2018 11:23 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Test 3
- Replies: 38
- Views: 2546
Re: Test 3
Another thing you need to know intramolecular forces like dipole-dipole and ion-ion as well as London dispersion forces
- Tue Nov 27, 2018 11:21 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: pi bond
- Replies: 4
- Views: 409
Re: pi bond
Can someone tell me how to draw a pi bond of p and d orbitals
- Tue Nov 27, 2018 11:20 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 3 material
- Replies: 3
- Views: 483
Re: Test 3 material
Bonding, and molecular shapes and structures will be a majority of the test
- Tue Nov 27, 2018 11:19 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 9 Test
- Replies: 6
- Views: 646
Re: Week 9 Test
It is very important to memorize the VESPR chart and all the bond angles and names because I heard that is part of every problem
- Tue Nov 27, 2018 11:18 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: ion-ion bond vs. H-bond
- Replies: 4
- Views: 733
Re: ion-ion bond vs. H-bond
ion-ion bond is the strongest bond because it is ionic, however an ionic bond in water is weaker than a covalent bond but still stronger than a hydrogen bond
- Tue Nov 27, 2018 11:16 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polar vs. Non-polar
- Replies: 6
- Views: 615
Re: Polar vs. Non-polar
If you were to draw the Lewis structure then you would be able to tell which molecules are polar or not
- Sat Nov 03, 2018 4:04 pm
- Forum: Ionic & Covalent Bonds
- Topic: Covalent Bonds
- Replies: 16
- Views: 1573
Re: Covalent Bonds
No, non-metals cannot form cations because they need to gain few electrons to complete the outer shell, so they become anions.
- Sat Nov 03, 2018 4:00 pm
- Forum: *Particle in a Box
- Topic: Midterm
- Replies: 17
- Views: 4206
Re: Midterm
The midterm will be 8 questions, also we will have an hour and 50 minutes for the test and it will go from the beginning to Lewis acids and bases.
- Sat Nov 03, 2018 3:58 pm
- Forum: Student Social/Study Group
- Topic: Studying
- Replies: 7
- Views: 896
Re: Studying
I remember him talking about doing as many homework problems as we can which is something that I will do because the more practice you can get the more comfortable you will be during the midterm.
- Sat Nov 03, 2018 3:52 pm
- Forum: Student Social/Study Group
- Topic: Orbitals
- Replies: 2
- Views: 252
Re: Orbitals
There are a lot of youtube videos that put the orbitals into songs which is an easier way to memorize the orbitals.
- Sat Nov 03, 2018 3:49 pm
- Forum: Lewis Structures
- Topic: Stable
- Replies: 2
- Views: 318
Re: Stable
To be the most stable the formal charge has to be 0.
- Thu Oct 18, 2018 2:19 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Psi squared meaning
- Replies: 4
- Views: 2911
Re: Psi squared meaning
Psi squared is the probability of finding and electron in an orbital.
- Thu Oct 18, 2018 2:14 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron configuration
- Replies: 2
- Views: 264
Electron configuration
I have a question on why silver's electron configuration is [Kr] 4d^10 5s^1 instead of [Kr]4d^105s^2. Thank you
- Thu Oct 18, 2018 2:08 pm
- Forum: Trends in The Periodic Table
- Topic: Period Table 'blocks'
- Replies: 5
- Views: 479
Re: Period Table 'blocks'
The s-block are the elements on columns 1 and 2, the p-block are the elements on columns 13-18, and the d block are the elements on columns are 3-12. They are grouped by columns because elements in the same column has the same number of valence electrons, and blocks are determined by valence electro...
- Thu Oct 11, 2018 3:03 pm
- Forum: Student Social/Study Group
- Topic: Studying techniques
- Replies: 12
- Views: 813
Re: Studying techniques
For this class the modules are very effective in studying because it has a lot of extra practice which makes practicing easier. Also doing extra homework problems are effective because you have the solutions you can continue working until you get the right answer.
- Thu Oct 11, 2018 2:55 pm
- Forum: Einstein Equation
- Topic: Units
- Replies: 5
- Views: 987
Re: Units
Since hertz is 1/second when you multiply (J x second)(1/second) the seconds cancel out which leads to J.
- Thu Oct 11, 2018 2:39 pm
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 147553
Re: Reading the textbook
I think reading the textbook is helpful when I do not understand the concept because it is like a reinforcement of the material because sometimes I do not fully understand something the first time. I also like to watch the modules to reinforce the textbook, and I like to review my notes as well.
- Wed Oct 03, 2018 3:23 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Coefficients and Subscripts
- Replies: 4
- Views: 1599
Re: Coefficients and Subscripts
You don't multiply the subscripts because it will change the identity of the molecule for example if you have H2O and you multiply it by 2 you're supposed to have 2H2O which is 2 water molecules, but if you also multiply the subscripts you get 2H4O which is 2 molecules of hydrogen hydrate.
- Wed Oct 03, 2018 3:16 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Relationship between density and molarity
- Replies: 2
- Views: 2042
Re: Relationship between density and molarity
I believe the 6.54g is the mass of the substance, then you divide it by (0.7857/1cm^3) because that is equal to 0.7857/1mL which is the density which is mass/volume.
- Wed Oct 03, 2018 3:06 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3057049
Re: Post All Chemistry Jokes Here
Q: Did you hear about the man who got cooled to absolute zero?
A: He's 0K now
A: He's 0K now