Search found 62 matches

by Selina Bellin 2B
Sat Mar 16, 2019 6:01 pm
Forum: Calculating the pH of Salt Solutions
Topic: pH on final
Replies: 5
Views: 272

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+ ?
by Selina Bellin 2B
Sat Mar 16, 2019 6:00 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Test 2 Q 7 [ENDORSED]
Replies: 5
Views: 72

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
by Selina Bellin 2B
Wed Mar 06, 2019 9:30 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Test #2
Replies: 10
Views: 137

Re: Test #2

during discussion week 9 most likely
by Selina Bellin 2B
Wed Mar 06, 2019 9:29 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Test 2
Replies: 7
Views: 116

Re: Test 2

more positive e value corresponds to a higher oxidizing power
by Selina Bellin 2B
Wed Mar 06, 2019 9:28 pm
Forum: Student Social/Study Group
Topic: Final
Replies: 24
Views: 421

Re: Final

yes i believe so
by Selina Bellin 2B
Tue Feb 26, 2019 4:44 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: salt bridge
Replies: 5
Views: 46

Re: salt bridge

allows ion transfer i believe
by Selina Bellin 2B
Tue Feb 26, 2019 4:43 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Redox Reactions
Replies: 4
Views: 44

Re: Redox Reactions

has highest positive standard potential
by Selina Bellin 2B
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: 160

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
by Selina Bellin 2B
Wed Feb 20, 2019 10:06 pm
Forum: Ideal Gases
Topic: units
Replies: 15
Views: 138

Re: units

K is unitless
by Selina Bellin 2B
Wed Feb 20, 2019 10:06 pm
Forum: Balancing Redox Reactions
Topic: H+ vs H3O+
Replies: 10
Views: 89

Re: H+ vs H3O+

i use H+ because it's easier to write haha
by Selina Bellin 2B
Wed Feb 20, 2019 10:02 pm
Forum: Balancing Redox Reactions
Topic: Week 7 Homework
Replies: 15
Views: 124

Re: Week 7 Homework

i did gibbs free energy stuff
by Selina Bellin 2B
Sun Feb 17, 2019 6:33 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Midterm Grades
Replies: 35
Views: 423

Re: Midterm Grades

discussion section i believe
by Selina Bellin 2B
Sun Feb 17, 2019 6:32 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Equations
Replies: 3
Views: 57

Re: Equations

idk i just try to memorize all of them: entropy and enthalpy for constant vol, pressure, temp and then pv=nrt
by Selina Bellin 2B
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: 242

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
by Selina Bellin 2B
Tue Feb 05, 2019 9:12 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Cup of Tea
Replies: 17
Views: 215

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 :)
by Selina Bellin 2B
Tue Feb 05, 2019 9:11 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Midterm [ENDORSED]
Replies: 48
Views: 769

Re: Midterm [ENDORSED]

practice problems! review sessions! covel study sessions!!!!!
by Selina Bellin 2B
Tue Feb 05, 2019 9:10 pm
Forum: Administrative Questions and Class Announcements
Topic: Practice Midterm
Replies: 3
Views: 115

Re: Practice Midterm

I hope so!
by Selina Bellin 2B
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: 105

Re: Homework

i definitely jumped around
by Selina Bellin 2B
Wed Jan 30, 2019 1:56 am
Forum: Phase Changes & Related Calculations
Topic: Units: Joules vs kJ
Replies: 5
Views: 74

Re: Units: Joules vs kJ

just be consistent and follow the question's units
by Selina Bellin 2B
Fri Jan 25, 2019 1:04 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE BOX and coefficients
Replies: 4
Views: 50

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
by Selina Bellin 2B
Fri Jan 25, 2019 1:02 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: increasing pressure, what happens to concentration?
Replies: 10
Views: 149

Re: increasing pressure, what happens to concentration?

increasing pressure will make the reaction go in the direction where there are LESS moles
by Selina Bellin 2B
Fri Jan 25, 2019 1:01 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: autoprotolysis on Test 1?
Replies: 2
Views: 43

Re: autoprotolysis on Test 1?

i didn't have it on mine but i'm pretty sure each test is different for each day...
by Selina Bellin 2B
Fri Jan 18, 2019 1:06 pm
Forum: Administrative Questions and Class Announcements
Topic: Studying for First Discussion Test
Replies: 10
Views: 124

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
by Selina Bellin 2B
Fri Jan 18, 2019 1:04 pm
Forum: Ideal Gases
Topic: Homework Week 2
Replies: 10
Views: 116

Re: Homework Week 2

yes, hw is due in discussion everyweek, no matter if there is a test or not
by Selina Bellin 2B
Fri Jan 18, 2019 1:03 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Kw
Replies: 6
Views: 97

Re: Kw

yes
by Selina Bellin 2B
Wed Jan 09, 2019 10:19 pm
Forum: Ideal Gases
Topic: Memorization
Replies: 12
Views: 302

Re: Memorization

i have no idea. hopefully it is provided
by Selina Bellin 2B
Wed Jan 09, 2019 10:17 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Calculating the Reaction Quotient
Replies: 3
Views: 38

Re: Calculating the Reaction Quotient

yes, divide mol by L to get molarity/concentration, no solids or liquids in calculating this
by Selina Bellin 2B
Wed Jan 09, 2019 10:16 pm
Forum: Student Social/Study Group
Topic: New to Lavelle
Replies: 32
Views: 576

Re: New to Lavelle

homework problems and practice test problems!!
by Selina Bellin 2B
Sat Dec 08, 2018 3:52 pm
Forum: Student Social/Study Group
Topic: Final
Replies: 12
Views: 323

Re: Final

no idea
by Selina Bellin 2B
Wed Nov 28, 2018 4:03 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: linear vs bent question
Replies: 7
Views: 113

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
by Selina Bellin 2B
Wed Nov 28, 2018 4:02 pm
Forum: Lewis Structures
Topic: Lewis structures vs VSEPR
Replies: 2
Views: 48

Re: Lewis structures vs VSEPR

if that's true i just screwed up my test...
by Selina Bellin 2B
Wed Nov 28, 2018 4:01 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 3
Views: 44

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
by Selina Bellin 2B
Wed Nov 28, 2018 3:59 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Happy Lavelle [ENDORSED]
Replies: 5
Views: 606

Re: Happy Lavelle [ENDORSED]

i love how excited he gets about everything
by Selina Bellin 2B
Wed Nov 28, 2018 3:56 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted, Arrhenious, or Lewis?
Replies: 2
Views: 39

Re: Bronsted, Arrhenious, or Lewis?

i THINK lewis i'm not sure tho
by Selina Bellin 2B
Sat Nov 17, 2018 11:15 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 3
Replies: 19
Views: 264

Re: Test 3

does anyone know if the vsepr chart is in the textbook?
by Selina Bellin 2B
Sat Nov 17, 2018 11:11 pm
Forum: Student Social/Study Group
Topic: midterm average
Replies: 4
Views: 182

Re: midterm average

83%
by Selina Bellin 2B
Sun Nov 11, 2018 12:20 am
Forum: Student Social/Study Group
Topic: Sig Figs on Midterm
Replies: 13
Views: 456

Re: Sig Figs on Midterm

always answer in sig figs!!! for everything
by Selina Bellin 2B
Sat Nov 10, 2018 11:45 pm
Forum: Student Social/Study Group
Topic: curve?
Replies: 20
Views: 707

Re: curve?

nope! but getting 50% gets you a C-
by Selina Bellin 2B
Sat Nov 10, 2018 11:45 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Isoelectronic
Replies: 14
Views: 448

Re: Isoelectronic

Isoelectronic means the atoms have the same number of valence electrons! hope this helps
by Selina Bellin 2B
Thu Nov 01, 2018 3:13 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7337
Views: 825509

Re: Post All Chemistry Jokes Here

H2O is water and H2O2 is hydrogen peroxide. What is H2O4?

Drinking lmao
by Selina Bellin 2B
Thu Nov 01, 2018 3:12 pm
Forum: Lewis Structures
Topic: Central Atom
Replies: 13
Views: 202

Re: Central Atom

lowest ionization energy!
by Selina Bellin 2B
Thu Nov 01, 2018 3:02 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge purpose
Replies: 33
Views: 1059

Re: Formal charge purpose

to determine the most stable formation
by Selina Bellin 2B
Sun Oct 28, 2018 8:27 pm
Forum: Trends in The Periodic Table
Topic: Ionization Energy [ENDORSED]
Replies: 7
Views: 111

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
by Selina Bellin 2B
Sun Oct 28, 2018 8:27 pm
Forum: Trends in The Periodic Table
Topic: Ionization Energy [ENDORSED]
Replies: 7
Views: 111

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
by Selina Bellin 2B
Sun Oct 28, 2018 8:25 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent Bonds
Replies: 7
Views: 106

Re: Covalent Bonds

i believe nonmetals create anions!
by Selina Bellin 2B
Sun Oct 28, 2018 8:23 pm
Forum: Trends in The Periodic Table
Topic: Ionization Energy and Electron Affinity
Replies: 9
Views: 307

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
by Selina Bellin 2B
Sun Oct 21, 2018 7:10 pm
Forum: Photoelectric Effect
Topic: Test 2
Replies: 16
Views: 338

Re: Test 2

these tests (aka not the midterm nor final) are NOT cummulative (to the best of my knowledge)
by Selina Bellin 2B
Sun Oct 21, 2018 7:09 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Lecture Question on Orbitals
Replies: 4
Views: 80

Re: Lecture Question on Orbitals

i don't understand this either :/
by Selina Bellin 2B
Sun Oct 21, 2018 7:07 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: test #2
Replies: 4
Views: 61

Re: test #2

the same amount as last time, same length not necessarily numbers
by Selina Bellin 2B
Sun Oct 21, 2018 7:05 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Quantum Number Ml
Replies: 2
Views: 40

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
by Selina Bellin 2B
Thu Oct 11, 2018 4:23 pm
Forum: Properties of Electrons
Topic: Homework Questions Ch1 #7
Replies: 2
Views: 66

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!!!!!!!
by Selina Bellin 2B
Thu Oct 11, 2018 4:17 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Moles [ENDORSED]
Replies: 6
Views: 281

Re: Moles [ENDORSED]

i think it says that the 1 compound yields 2 moles of Fe
by Selina Bellin 2B
Fri Oct 05, 2018 4:44 pm
Forum: SI Units, Unit Conversions
Topic: How does grading for discussion posts work?
Replies: 73
Views: 1836

Re: How does grading for discussion posts work?

does quoting replies not count as a "response"? I feel like it should.
by Selina Bellin 2B
Fri Oct 05, 2018 4:43 pm
Forum: SI Units, Unit Conversions
Topic: How does grading for discussion posts work?
Replies: 73
Views: 1836

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...
by Selina Bellin 2B
Fri Oct 05, 2018 4:42 pm
Forum: SI Units, Unit Conversions
Topic: How does grading for discussion posts work?
Replies: 73
Views: 1836

Re: How does grading for discussion posts work?

one response = 1 point. 1 question posted = 1 point.
by Selina Bellin 2B
Fri Oct 05, 2018 4:38 pm
Forum: Significant Figures
Topic: knowing how many sig figs to use
Replies: 17
Views: 463

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!

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