## Search found 56 matches

Mon Mar 11, 2019 4:10 pm
Forum: Second Order Reactions
Topic: 2nd order
Replies: 4
Views: 174

### 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: 168

### 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
Mon Mar 11, 2019 3:56 pm
Forum: Student Social/Study Group
Topic: Review session
Replies: 5
Views: 514

### 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: 1412

### 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: 1707

### 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: 427

### 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: 230

### 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: 30
Views: 799

### 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: 854

### 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: 135

### 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: 32
Views: 2510

### 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: 165

### 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: 586

### 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: 767

### 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: 472

### 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: 3840

### 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: 162

### 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: 878

### 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: 294

### 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: 268

### 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: 263

### 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: 227

### 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: 337

### 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: 379

### 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: 965

### 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: 691

### 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: 129

### 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: 243

### 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: 137

### 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: 277

### 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: 567

### 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: 436

### 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: 295

### Re: Acid Rain

So2+H20= H2SO3
Sun Dec 09, 2018 10:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: AX3E
Replies: 18
Views: 799

### 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: 585

### 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: 11208

### 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: 1181

### 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: 188

### 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: 226

### 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: 335

### 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: 383

### 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: 254

### 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: 603

### 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: 1716

### 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: 590

### 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: 115

### 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: 114

### 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: 692

### 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: 88

### 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: 154

### 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: 389

### 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: 261

### 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 [ENDORSED]
Replies: 147
Views: 104668

### Re: Reading the textbook[ENDORSED]

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: 311

### 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: 892

### 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: 8039
Views: 1411258

### Re: Post All Chemistry Jokes Here

Q: Did you hear about the man who got cooled to absolute zero?
A: He's 0K now

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