Search found 62 matches
- Sat Mar 16, 2019 6:01 pm
- Forum: Calculating the pH of Salt Solutions
- Topic: pH on final
- Replies: 5
- Views: 1451
Re: pH on final
i think a lot of questions are up for grabs, but you just got to know that given a certain situation, how could you find the molarity of H+ ?
- Sat Mar 16, 2019 6:00 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Test 2 Q 7 [ENDORSED]
- Replies: 5
- Views: 994
Re: Test 2 Q 7 [ENDORSED]
the situation is spontaneous bc there's nothing else that needs to be done to the ice in order to melt it
- Sat Mar 16, 2019 5:58 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Final [ENDORSED]
- Replies: 9
- Views: 1143
Re: Final [ENDORSED]
yes
- Wed Mar 06, 2019 9:30 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Test #2
- Replies: 10
- Views: 1064
Re: Test #2
during discussion week 9 most likely
- Wed Mar 06, 2019 9:29 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Test 2
- Replies: 7
- Views: 838
Re: Test 2
more positive e value corresponds to a higher oxidizing power
- Wed Mar 06, 2019 9:28 pm
- Forum: Student Social/Study Group
- Topic: Final
- Replies: 24
- Views: 2230
Re: Final
yes i believe so
- Tue Feb 26, 2019 4:44 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: salt bridge
- Replies: 5
- Views: 595
Re: salt bridge
allows ion transfer i believe
- Tue Feb 26, 2019 4:44 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: List of Cell Potentials
- Replies: 1
- Views: 220
- Tue Feb 26, 2019 4:43 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Redox Reactions
- Replies: 4
- Views: 549
Re: Redox Reactions
has highest positive standard potential
- Tue Feb 26, 2019 4:43 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: ln(k2/k1)=(-delta H/R)(1/T2 - 1/T1)
- Replies: 3
- Views: 6597
Re: ln(k2/k1)=(-delta H/R)(1/T2 - 1/T1)
memorize it and understand where it comes from, but i believe it's also on the test's formula page
- Wed Feb 20, 2019 10:06 pm
- Forum: Ideal Gases
- Topic: units
- Replies: 15
- Views: 1394
Re: units
K is unitless
- Wed Feb 20, 2019 10:06 pm
- Forum: Balancing Redox Reactions
- Topic: H+ vs H3O+
- Replies: 10
- Views: 1010
Re: H+ vs H3O+
i use H+ because it's easier to write haha
- Wed Feb 20, 2019 10:02 pm
- Forum: Balancing Redox Reactions
- Topic: Week 7 Homework
- Replies: 15
- Views: 1253
Re: Week 7 Homework
i did gibbs free energy stuff
- Sun Feb 17, 2019 6:33 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Midterm Grades
- Replies: 35
- Views: 2795
Re: Midterm Grades
discussion section i believe
- Sun Feb 17, 2019 6:32 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Equations
- Replies: 3
- Views: 397
Re: Equations
idk i just try to memorize all of them: entropy and enthalpy for constant vol, pressure, temp and then pv=nrt
- Sun Feb 17, 2019 6:31 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Work done vs work on system
- Replies: 18
- Views: 3916
Re: Work done vs work on system
work done by system is negative. its putting energy into something else aka its losing energy. and vice versa
- Tue Feb 05, 2019 9:12 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Cup of Tea
- Replies: 17
- Views: 2552
Re: Cup of Tea
you can change it's energy AND matter. you can add or remove the tea, and you can heat it up/cool it down :)
- Tue Feb 05, 2019 9:11 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Midterm [ENDORSED]
- Replies: 49
- Views: 4920
Re: Midterm [ENDORSED]
practice problems! review sessions! covel study sessions!!!!!
- Tue Feb 05, 2019 9:10 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Practice Midterm
- Replies: 3
- Views: 417
Re: Practice Midterm
I hope so!
- Wed Jan 30, 2019 1:59 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Heat Capacity
- Replies: 8
- Views: 783
- Wed Jan 30, 2019 1:59 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Homework
- Replies: 9
- Views: 932
Re: Homework
i definitely jumped around
- Wed Jan 30, 2019 1:56 am
- Forum: Phase Changes & Related Calculations
- Topic: Units: Joules vs kJ
- Replies: 5
- Views: 562
Re: Units: Joules vs kJ
just be consistent and follow the question's units
- Fri Jan 25, 2019 1:04 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE BOX and coefficients
- Replies: 4
- Views: 792
Re: ICE BOX and coefficients
if you have a coefficient in ur reaction, in the ICE box, multiply ur equilibrium (for example, x) by the coefficient. also, don't forget in ur K expression to use that coefficient as its exponent
- Fri Jan 25, 2019 1:02 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: increasing pressure, what happens to concentration?
- Replies: 10
- Views: 2592
Re: increasing pressure, what happens to concentration?
increasing pressure will make the reaction go in the direction where there are LESS moles
- Fri Jan 25, 2019 1:01 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: autoprotolysis on Test 1?
- Replies: 2
- Views: 277
Re: autoprotolysis on Test 1?
i didn't have it on mine but i'm pretty sure each test is different for each day...
- Fri Jan 18, 2019 1:06 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Studying for First Discussion Test
- Replies: 10
- Views: 835
Re: Studying for First Discussion Test
do all the hw problems! and also, try to make a one side cheat sheet on how to solve dif equations! this helps me a lot
- Fri Jan 18, 2019 1:04 pm
- Forum: Ideal Gases
- Topic: Homework Week 2
- Replies: 10
- Views: 1042
Re: Homework Week 2
yes, hw is due in discussion everyweek, no matter if there is a test or not
- Fri Jan 18, 2019 1:03 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Kw
- Replies: 6
- Views: 590
Re: Kw
yes
- Wed Jan 09, 2019 10:19 pm
- Forum: Ideal Gases
- Topic: Memorization
- Replies: 12
- Views: 1283
Re: Memorization
i have no idea. hopefully it is provided
- Wed Jan 09, 2019 10:17 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Calculating the Reaction Quotient
- Replies: 3
- Views: 383
Re: Calculating the Reaction Quotient
yes, divide mol by L to get molarity/concentration, no solids or liquids in calculating this
- Wed Jan 09, 2019 10:16 pm
- Forum: Student Social/Study Group
- Topic: New to Lavelle
- Replies: 32
- Views: 5324
Re: New to Lavelle
homework problems and practice test problems!!
- Sat Dec 08, 2018 3:52 pm
- Forum: Student Social/Study Group
- Topic: Final
- Replies: 12
- Views: 1724
Re: Final
no idea
- Wed Nov 28, 2018 4:03 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: linear vs bent question
- Replies: 7
- Views: 1195
Re: linear vs bent question
bent aka angular happens when a linear looking molecule has an area of electron density surrounding the central atom that consists of a lone pair
- Wed Nov 28, 2018 4:02 pm
- Forum: Lewis Structures
- Topic: Lewis structures vs VSEPR
- Replies: 2
- Views: 209
Re: Lewis structures vs VSEPR
if that's true i just screwed up my test...
- Wed Nov 28, 2018 4:01 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 3
- Views: 188
Re: Bond Angles
bond angles:
See-saw: less than 90 and less than 120 degrees
T-Shape: less than 90 degrees
Square Pyramidal: less than 90 degrees
Square Planar: 90 degrees
See-saw: less than 90 and less than 120 degrees
T-Shape: less than 90 degrees
Square Pyramidal: less than 90 degrees
Square Planar: 90 degrees
- Wed Nov 28, 2018 3:59 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Happy Lavelle [ENDORSED]
- Replies: 5
- Views: 1228
Re: Happy Lavelle [ENDORSED]
i love how excited he gets about everything
- Wed Nov 28, 2018 3:56 pm
- Forum: Bronsted Acids & Bases
- Topic: Bronsted, Arrhenious, or Lewis?
- Replies: 2
- Views: 321
Re: Bronsted, Arrhenious, or Lewis?
i THINK lewis i'm not sure tho
- Sat Nov 17, 2018 11:15 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Thanksgiving Wednesday Class
- Replies: 19
- Views: 1468
- Sat Nov 17, 2018 11:15 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Test 3
- Replies: 19
- Views: 1394
Re: Test 3
does anyone know if the vsepr chart is in the textbook?
- Sat Nov 17, 2018 11:11 pm
- Forum: Student Social/Study Group
- Topic: midterm average
- Replies: 4
- Views: 543
- Sun Nov 11, 2018 12:20 am
- Forum: Student Social/Study Group
- Topic: Sig Figs on Midterm
- Replies: 13
- Views: 1591
Re: Sig Figs on Midterm
always answer in sig figs!!! for everything
- Sat Nov 10, 2018 11:45 pm
- Forum: Student Social/Study Group
- Topic: curve?
- Replies: 20
- Views: 3034
Re: curve?
nope! but getting 50% gets you a C-
- Sat Nov 10, 2018 11:45 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Isoelectronic
- Replies: 14
- Views: 2171
Re: Isoelectronic
Isoelectronic means the atoms have the same number of valence electrons! hope this helps
- Thu Nov 01, 2018 3:13 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3661282
Re: Post All Chemistry Jokes Here
H2O is water and H2O2 is hydrogen peroxide. What is H2O4?
Drinking lmao
Drinking lmao
- Thu Nov 01, 2018 3:12 pm
- Forum: Lewis Structures
- Topic: Central Atom
- Replies: 13
- Views: 918
Re: Central Atom
lowest ionization energy!
- Thu Nov 01, 2018 3:02 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal charge purpose
- Replies: 40
- Views: 7206
Re: Formal charge purpose
to determine the most stable formation
- Sun Oct 28, 2018 8:27 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization Energy [ENDORSED]
- Replies: 7
- Views: 913
Re: Ionization Energy [ENDORSED]
it increases across a row because as protons are added, the force of attraction is stronger and therefore it is more difficult to remove an electron
- Sun Oct 28, 2018 8:27 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization Energy [ENDORSED]
- Replies: 7
- Views: 913
Re: Ionization Energy [ENDORSED]
it increases across a row because as protons are added, the force of attraction is stronger and therefore it is more difficult to remove an electron
- Sun Oct 28, 2018 8:26 pm
- Forum: Ionic & Covalent Bonds
- Topic: Question regarding ionic bonds
- Replies: 9
- Views: 660
- Sun Oct 28, 2018 8:25 pm
- Forum: Ionic & Covalent Bonds
- Topic: Covalent Bonds
- Replies: 7
- Views: 703
Re: Covalent Bonds
i believe nonmetals create anions!
- Sun Oct 28, 2018 8:23 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization Energy and Electron Affinity
- Replies: 9
- Views: 1869
Re: Ionization Energy and Electron Affinity
SophiaKohlhoff4B wrote:Is there a trend for electron affinities?
the trend for electron affinity is
-down a column it decreases due to the weaker force of attraction as energy levels increase
-across a row it increases because adding protons increase the force of attraction
- Sun Oct 21, 2018 7:10 pm
- Forum: Photoelectric Effect
- Topic: Test 2
- Replies: 16
- Views: 1184
Re: Test 2
these tests (aka not the midterm nor final) are NOT cummulative (to the best of my knowledge)
- Sun Oct 21, 2018 7:09 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Lecture Question on Orbitals
- Replies: 4
- Views: 457
Re: Lecture Question on Orbitals
i don't understand this either :/
- Sun Oct 21, 2018 7:07 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: test #2
- Replies: 4
- Views: 353
Re: test #2
the same amount as last time, same length not necessarily numbers
- Sun Oct 21, 2018 7:05 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Quantum Number Ml
- Replies: 2
- Views: 288
Re: Quantum Number Ml
if it asks to put all possible magnetic quantum numbers, you would put -1,0,1 etc, depending on the question
- Thu Oct 11, 2018 4:23 pm
- Forum: Empirical & Molecular Formulas
- Topic: Is it possible for the Empirical and Molecular formula to be the same? [ENDORSED]
- Replies: 8
- Views: 1283
Re: Is it possible for the Empirical and Molecular formula to be the same? [ENDORSED]
yes! completely possible :)
- Thu Oct 11, 2018 4:23 pm
- Forum: Properties of Electrons
- Topic: Homework Questions Ch1 #7
- Replies: 2
- Views: 266
Homework Questions Ch1 #7
chapter 1
#7: can someone please describe to me in detail (i never learned any of this in highschool so i am very lost) how to convert Hz into nanometers? Thank you!!!!!!!
#7: can someone please describe to me in detail (i never learned any of this in highschool so i am very lost) how to convert Hz into nanometers? Thank you!!!!!!!
- Thu Oct 11, 2018 4:17 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Moles [ENDORSED]
- Replies: 6
- Views: 1273
Re: Moles [ENDORSED]
i think it says that the 1 compound yields 2 moles of Fe
- Fri Oct 05, 2018 4:44 pm
- Forum: SI Units, Unit Conversions
- Topic: How does grading for discussion posts work?
- Replies: 80
- Views: 8872
Re: How does grading for discussion posts work?
does quoting replies not count as a "response"? I feel like it should.
- Fri Oct 05, 2018 4:43 pm
- Forum: SI Units, Unit Conversions
- Topic: How does grading for discussion posts work?
- Replies: 80
- Views: 8872
Re: How does grading for discussion posts work?
Hi guys. May I know what’s included in our test next week? Is it the whole of the Fundamental section, or just the sections mentioned in Outline 1? Thanks! i believe it's just online 1! if anyone knows differently please let me know, but I think an email was sent out saying it was everything on out...
- Fri Oct 05, 2018 4:42 pm
- Forum: SI Units, Unit Conversions
- Topic: How does grading for discussion posts work?
- Replies: 80
- Views: 8872
Re: How does grading for discussion posts work?
one response = 1 point. 1 question posted = 1 point.
- Fri Oct 05, 2018 4:38 pm
- Forum: Significant Figures
- Topic: knowing how many sig figs to use
- Replies: 17
- Views: 2220
Re: knowing how many sig figs to use
the appropriate amount of sigfigs to use in an answer is the least amount of sigfigs. so if a question has 3 values, 3.08, 4.204 and 9.02, 3 sigfigs are the appropriate amount to use in your result. hope this makes sense!