Search found 128 matches

by EMurphy_2L
Wed Mar 11, 2020 4:48 pm
Forum: Student Social/Study Group
Topic: notes
Replies: 1
Views: 65

notes

hi could someone send me their notes from Friday and Mondays classes (3/6 and 3/9) please!
by EMurphy_2L
Wed Mar 11, 2020 4:43 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: salt bridge
Replies: 11
Views: 33

Re: salt bridge

a porous disk can also be used for this purpose! that's just a membrane which balances charge
by EMurphy_2L
Wed Mar 11, 2020 4:41 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 118
Views: 21289

Re: Final Jitters

hopefully now, having the test environment removed from the situation helps!
by EMurphy_2L
Wed Mar 11, 2020 4:39 pm
Forum: First Order Reactions
Topic: rate constants
Replies: 19
Views: 103

Re: rate constants

Leila_4G wrote:In what case would we ever get a negative rate constant?

for 0 or 1 order reactions in which the slope is negative!
by EMurphy_2L
Wed Mar 11, 2020 4:31 pm
Forum: Administrative Questions and Class Announcements
Topic: final
Replies: 14
Views: 131

final

will the take-home final be during the same time as it was originally scheduled? and how long will we have to complete it?
by EMurphy_2L
Thu Mar 05, 2020 4:12 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: strength as reducing agents
Replies: 3
Views: 23

Re: strength as reducing agents

ASetlur_1G wrote:The more negative the standard reduction potential, the stronger the reducing agent. The more positive the standard reduction potential, the stronger the oxidizing agent.

how do you know this
by EMurphy_2L
Wed Mar 04, 2020 10:18 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: strength as reducing agents
Replies: 3
Views: 23

strength as reducing agents

how do you know which elements are stronger reducing agents? like Cr, Cu, Zn, and Fe? or Li, N, K, Mg? what is a standard reduction potential and how do you know/find it?
by EMurphy_2L
Wed Mar 04, 2020 5:25 pm
Forum: Balancing Redox Reactions
Topic: inferring half rxns from equation
Replies: 4
Views: 34

Re: inferring half rxns from equation

oh also when can you just neglect elements? like 6L.9) KMnO4 and FeCl are involved in the reaction but just MnO4 and Fe are written in the redox reaction and cell diagram????
by EMurphy_2L
Wed Mar 04, 2020 5:19 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Concentration Cell
Replies: 7
Views: 45

Re: Concentration Cell

he didn't do a good job of explaining this but, from what I gathered, it's a cell/bettery which you set up to measure E by changing the concentrations of R and P. I don't have an example
by EMurphy_2L
Wed Mar 04, 2020 5:17 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: 6N 17: Cell doing work
Replies: 3
Views: 35

Re: 6N 17: Cell doing work

if delta G is positive the cell cannot do work
unless electrically charged (ie if you plug in your phone you are reversing the process of the battery, making G positive, but it doesn't happen on its own)
by EMurphy_2L
Wed Mar 04, 2020 5:15 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: 6N 17: Cell doing work
Replies: 3
Views: 35

Re: 6N 17: Cell doing work

Yes! work being negative means its doing work and G being negative means its spontaneous/favorable
by EMurphy_2L
Wed Mar 04, 2020 5:12 pm
Forum: Balancing Redox Reactions
Topic: 6L.7
Replies: 1
Views: 27

6L.7

literally not a single part of this question makes sense to me. if someone could go through it very explicitly that would be helpful!
by EMurphy_2L
Wed Mar 04, 2020 4:56 pm
Forum: Balancing Redox Reactions
Topic: inferring half rxns from equation
Replies: 4
Views: 34

inferring half rxns from equation

I don't know how to infer these sorts of things to balance half rxns. for example 6L.5.c) Cl2 + H2 --> HCl yields the half reactions Cl2 + 2e --> Cl- and H2 + 2e --> H+ but why don't they have products of HCl as that's all that is given in the problem? Why are we, in this one problem, allowed to spl...
by EMurphy_2L
Wed Mar 04, 2020 4:50 pm
Forum: Balancing Redox Reactions
Topic: confusing homework question
Replies: 4
Views: 57

confusing homework question

in 6L.5) part b) why do you add Pt as a solid for the Iodine anode reaction? You are already given the solid I2(s) so why to you need an inert conductor?
by EMurphy_2L
Wed Feb 26, 2020 6:09 pm
Forum: Balancing Redox Reactions
Topic: Oxidizing agent and Reducing Agent
Replies: 4
Views: 38

Re: Oxidizing agent and Reducing Agent

the compound which is oxidized is the reducing agent because it impacts the other compound
the compound which is reduced is the oxidizing agent because it impacts the other compound
by EMurphy_2L
Wed Feb 26, 2020 4:48 pm
Forum: Balancing Redox Reactions
Topic: common oxidation numbers
Replies: 3
Views: 30

common oxidation numbers

what are common oxidation numbers we should know, besides oxygen being 2-??
by EMurphy_2L
Wed Feb 26, 2020 4:46 pm
Forum: Balancing Redox Reactions
Topic: balancing in acidic solutions
Replies: 4
Views: 34

balancing in acidic solutions

for balancing an oxidation half reaction in an acidic solution, do you add H3O+ on the right side? or H+?
In my discussion my TA used H3O+ but the textbook uses H+....
by EMurphy_2L
Wed Feb 26, 2020 4:03 pm
Forum: Balancing Redox Reactions
Topic: oxidation numbers
Replies: 3
Views: 50

oxidation numbers

how do you know the oxidation numbers of elements? like in the most basic way
for example, Cr2O7(2-) + C2H5OH --> Cr(3+) + C2H4O

how do you know the oxidation numbers of C and Cr (please be very explicit lol)
by EMurphy_2L
Wed Feb 26, 2020 3:56 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Test 2
Replies: 2
Views: 31

Test 2

what text book problems correspond to the second page of thermo that will be covered on test 2?? I'm having trouble picking them out.
by EMurphy_2L
Mon Feb 24, 2020 1:04 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Oxidation versus reduction
Replies: 9
Views: 54

Re: Oxidation versus reduction

anode is left and cathode is right unless otherwise stated !
by EMurphy_2L
Mon Feb 24, 2020 1:03 am
Forum: Administrative Questions and Class Announcements
Topic: Test 2
Replies: 5
Views: 54

Re: Test 2

yes!
by EMurphy_2L
Mon Feb 24, 2020 1:02 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: salt bridge
Replies: 5
Views: 41

Re: salt bridge

you can also use a porous disk to achieve this! just a material which allows the certain type of ions to move through
by EMurphy_2L
Mon Feb 24, 2020 1:01 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: midterm
Replies: 5
Views: 68

midterm

how long after the test can we discuss grading with our TA?
by EMurphy_2L
Mon Feb 24, 2020 1:00 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Test 2
Replies: 6
Views: 53

Re: Test 2

second page of outline 4 (not on midterm) and all of outline 5
by EMurphy_2L
Wed Feb 12, 2020 1:13 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: spontaneity
Replies: 4
Views: 26

Re: spontaneity

thanks! what about part 1?
by EMurphy_2L
Wed Feb 12, 2020 1:08 am
Forum: Administrative Questions and Class Announcements
Topic: Pizza Rolls REVIEW Session DOWNLOAD HERE
Replies: 67
Views: 2477

Re: Pizza Rolls REVIEW Session DOWNLOAD HERE

HELP for question 6, why is ΔU=0 and ΔS=0 for all three changes?
by EMurphy_2L
Tue Feb 11, 2020 1:37 pm
Forum: Administrative Questions and Class Announcements
Topic: Pizza Rolls REVIEW Session DOWNLOAD HERE
Replies: 67
Views: 2477

Re: Pizza Rolls REVIEW Session DOWNLOAD HERE

Can someone help me solve problem 3B? I wasnt able to make it to the review session and the enthalpy of fusion is causing me problems Hi! someone answered a similar question above but for 3B you are given more info than you think. First you need to realize that the ice cream both warms in solid pha...
by EMurphy_2L
Tue Feb 11, 2020 1:32 pm
Forum: Administrative Questions and Class Announcements
Topic: Pizza Rolls REVIEW Session DOWNLOAD HERE
Replies: 67
Views: 2477

Re: Pizza Rolls REVIEW Session DOWNLOAD HERE

what is the difference between extensive and intensive properties? an extensive property is one based on the amount of substance. intensive is one that is general, despite amount. heat capacity is extensive because you need to know the number of moles or grams. specific heat capacity is intensive b...
by EMurphy_2L
Tue Feb 11, 2020 1:29 pm
Forum: Administrative Questions and Class Announcements
Topic: Pizza Rolls REVIEW Session DOWNLOAD HERE
Replies: 67
Views: 2477

Re: Pizza Rolls REVIEW Session DOWNLOAD HERE

can someone explain the lex luthor problem to me? it's number 5. i think for part a, i need to use the 2 entropy equations as well as the equipartition thing. and i'm not sure about b... Yes for part A you need to consider the entropy change in 3 parts: change in Kr, change in He, and change in tem...
by EMurphy_2L
Tue Feb 11, 2020 12:01 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Go=0
Replies: 7
Views: 46

Go=0

when does G*=0
by EMurphy_2L
Mon Feb 10, 2020 11:52 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: isothermal
Replies: 2
Views: 23

isothermal

if ΔT=0, does ΔU=0?
by EMurphy_2L
Mon Feb 10, 2020 11:35 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: S and H
Replies: 1
Views: 28

S and H

how do you show how ∆S is related to ∆H for a change at constant temperature and pressure and explain the relationship
by EMurphy_2L
Mon Feb 10, 2020 11:35 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: spontaneity
Replies: 4
Views: 26

spontaneity

How do you:
1-Show how the Gibbs free energy change accompanying a process is related to the direction of spontaneous reaction.
2-Predict the temperature at which a process with a known ∆H and ∆S becomes spontaneous.
by EMurphy_2L
Mon Feb 10, 2020 8:10 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: pH
Replies: 3
Views: 41

pH

Can someone please explain why solutions of weak acids have higher pH values than solutions of strong acids at the same concentration.
by EMurphy_2L
Sat Feb 08, 2020 6:14 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: q
Replies: 1
Views: 14

q

basic question... what is q? and what does it mean when it's qp or qv and everything?
by EMurphy_2L
Sat Feb 08, 2020 5:35 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: units
Replies: 3
Views: 19

units

what are the units of S, U, H, and G?
by EMurphy_2L
Sat Feb 08, 2020 5:33 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: internal energy
Replies: 3
Views: 25

internal energy

so does ΔU = ΔH at constant pressure and constant volume?
by EMurphy_2L
Sat Feb 08, 2020 4:03 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: biological examples
Replies: 2
Views: 32

biological examples

can someone explain the biological examples for equilibrium of ATP hydrolysis and osmotic pressure please!
by EMurphy_2L
Sat Feb 08, 2020 3:03 pm
Forum: Phase Changes & Related Calculations
Topic: Steam burns more than water
Replies: 5
Views: 60

Steam burns more than water

Can someone please explain why steam at 100 oC causes a worse burn than boiling water at 100 oC? He went through this too fast in class. Thanks!
by EMurphy_2L
Sun Feb 02, 2020 4:26 pm
Forum: Administrative Questions and Class Announcements
Topic: Extra Credit
Replies: 7
Views: 82

Re: Extra Credit

the chemistry community points are tallied by a computer, not your TA, they just put it in the grade book so u can talk to your TA about doing other homework questions or something but probably not more CC questions but also 5 points is only 1% of your final grade so don't worry!!!! and I think it r...
by EMurphy_2L
Sun Feb 02, 2020 4:24 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: State Property vs Function
Replies: 2
Views: 23

Re: State Property vs Function

what I understood was that they are the same thing but you just use different terms when discussing it conceptually or in context!!
by EMurphy_2L
Sun Feb 02, 2020 4:23 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE
Replies: 20
Views: 98

Re: ICE

you need two values! these are usually only one starting concentration and K OR one starting concentration and one ending concentration
by EMurphy_2L
Sun Feb 02, 2020 4:22 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: 4B 11
Replies: 2
Views: 12

Re: 4B 11

I would just go thru the conceptual things he covered in class relating those variables to each other like under what conditions each term is zero, therefore making
U equal to some other variable ....
by EMurphy_2L
Sun Feb 02, 2020 4:20 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: 4A.1
Replies: 12
Views: 53

Re: 4A.1

open- matter and energy transfer
closed- energy transfer
isolated- no transfer
by EMurphy_2L
Thu Jan 23, 2020 1:37 pm
Forum: Ideal Gases
Topic: test 1
Replies: 9
Views: 67

test 1

enthalpy and Wednesday's lecture won't be on test 1, right?
by EMurphy_2L
Thu Jan 23, 2020 1:28 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Ka and Kb
Replies: 10
Views: 63

Re: Ka and Kb

Alex Tchekanov Dis 2k wrote:You can think about it like this. K is the products over reactants, so therefore anytime the reactants are waayyyyyyyy more than the products it is weak, more specifically when the ratio makes the K value less than 10^-3. This is regardless if it's an acid or base.

so Ka>10 3 is a strong acid?
by EMurphy_2L
Thu Jan 23, 2020 1:24 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Ka and Kb
Replies: 10
Views: 63

Ka and Kb

so if Kb<10 -3 means it's a weak base, does Ka>10 3 mean it's a weak acid?
by EMurphy_2L
Mon Jan 20, 2020 5:45 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE table and X
Replies: 6
Views: 31

Re: ICE table and X

this is correct, it's basically just used to save yourself time not doing the quadratic equation and assuming that a small value being subtracted in the denominator won't really change the equation. because we say it's negligible and not that it's zero, we still keep the x squared in the numerator
by EMurphy_2L
Mon Jan 20, 2020 5:43 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Sig Figs for pH/pOH
Replies: 7
Views: 43

Re: Sig Figs for pH/pOH

the number of sig figs in the problem asked is the number of decimal places you include after taking a log (which applies to pH and pOH)
by EMurphy_2L
Mon Jan 20, 2020 5:42 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Endothermic vs Exothermic
Replies: 7
Views: 30

Re: Endothermic vs Exothermic

there was one question which asked to label reactions as endo or exo thermic basically and two good examples are: N2O4(g) <> 2NO2 where delta H= +57K this is endothermic because heat is required X2(g) <> 2X(g) this is also endothermic because a bond is being broken to form two X molecules and breaki...
by EMurphy_2L
Mon Jan 20, 2020 5:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE tables
Replies: 5
Views: 29

ICE tables

when do we use an ICE table? like what words in a question should signal us to use one?
by EMurphy_2L
Mon Jan 20, 2020 5:37 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K
Replies: 5
Views: 32

K

When a question asks if increasing or decreasing a substance will change the equilibrium constant, the answer is always no, correct? no matter the phase or if it's water or anything?
by EMurphy_2L
Tue Jan 14, 2020 5:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Weak Acids/Bases
Replies: 2
Views: 23

Re: Weak Acids/Bases

I think in this unit we will mostly be working with strong acids and bases, though! Because it's simpler to calculate when completely ionized
by EMurphy_2L
Mon Jan 13, 2020 5:09 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc and Kp
Replies: 8
Views: 48

Re: Kc and Kp

but can't you also use Kc for gases? so the phases don't really tell you anything but just go off of what you're given?
by EMurphy_2L
Mon Jan 13, 2020 5:06 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Autoprotolysis of water endo or exo?
Replies: 4
Views: 20

Re: Autoprotolysis of water endo or exo?

can someone elaborate on why this is endothermic? because a bond is both being formed and broken (exo and endo, respectively)...
by EMurphy_2L
Mon Jan 13, 2020 5:04 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Calculating for Pressure
Replies: 5
Views: 25

Re: Calculating for Pressure

if you are dealing with all pressures though then yes it is!! Like if you use K subP then you can find the partial pressure even without temperature because no concentrations are involved so no equation with concentration or temperature is needed! just solve in the same way you do with K subC
by EMurphy_2L
Mon Jan 13, 2020 5:02 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: volume change with inert gas
Replies: 9
Views: 57

Re: volume change with inert gas

the only reason we think of the reaction shifting with increased pressure is presumably because we were taught it wrong before. While increasing pressure by like putting force on gas does shift the reaction, it's really because the volume is changing (not the pressure which is changing but not affec...
by EMurphy_2L
Mon Jan 13, 2020 4:59 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Reaction Quotient
Replies: 11
Views: 51

Re: Reaction Quotient

We only use the reaction quotient in this class to be able to compare it to the equilibrium constant and see if more reactants or products will form as the vessel sits. It's derived in the same way as K (as the person above said)
by EMurphy_2L
Wed Jan 08, 2020 4:06 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: reactants compared to products
Replies: 4
Views: 35

reactants compared to products

if you start with a higher concentration of reactants, will the equilibrium concentration of the products be larger?
by EMurphy_2L
Wed Jan 08, 2020 4:05 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: changing K
Replies: 4
Views: 46

changing K

do the trends for Kp also apply to Kc? for example, "if one starts with a higher pressure of reactant, will the equilibrium constant be larger?" this is false for Kp so is it also false for Kc?
by EMurphy_2L
Wed Jan 08, 2020 4:00 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc and Kp
Replies: 8
Views: 48

Kc and Kp

when a question simply asks for "the equilibrium constant" or "K" does that mean related to concentration or pressure? and why is this so easily interchangeable?
by EMurphy_2L
Wed Jan 08, 2020 3:39 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: units
Replies: 3
Views: 38

units

for the equilibrium constant of pressure, what units are acceptable? do we have to convert all pressures to atm? In class Lavelle used ate but the textbook uses bar... do we convert or just use bar
by EMurphy_2L
Tue Jan 07, 2020 3:46 pm
Forum: Administrative Questions and Class Announcements
Topic: Homework 1
Replies: 18
Views: 166

Re: Homework 1

for week one its due in lecture on Friday! then all other weeks it's due in discussion
by EMurphy_2L
Tue Dec 03, 2019 6:39 pm
Forum: Naming
Topic: naming bases
Replies: 1
Views: 24

naming bases

I know dr Lavelle said CH3NH2, methylammine and (CH3)3N, trimethylamine are weak acids but I just don't understand where these names come from?
by EMurphy_2L
Tue Dec 03, 2019 6:30 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: oxygen in chelating agent
Replies: 1
Views: 22

oxygen in chelating agent

if double bound oxygen is in Lewis base, is this polydentate? because oxygen has two lone pairs?
by EMurphy_2L
Tue Dec 03, 2019 6:25 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: 1
Views: 26

hydrogen bonding

so a hydrogen bond can form on a lone pair of a N O F molecule
does this mean there are two possible sites of hydrogen bonding on an oxygen with a double bond and therefore two lone pairs?
also, can the hydrogen be bonded to anything and then form a hydrogen bond with N O F?
by EMurphy_2L
Tue Dec 03, 2019 6:23 pm
Forum: *Shrodinger Equation
Topic: schrodingers equation
Replies: 7
Views: 77

schrodingers equation

do we really need to know this? is this really used in anything?
by EMurphy_2L
Tue Dec 03, 2019 6:22 pm
Forum: Properties of Light
Topic: photons
Replies: 3
Views: 55

photons

does a short wavelength = more energy per photon? or is wavelength intensity??
also, is intensity proportional to electrons emitted (only if able to remove electron already) like doubled intensity results in doubled amount of electrons emitted?
by EMurphy_2L
Mon Dec 02, 2019 10:45 pm
Forum: Biological Examples
Topic: cisplatin
Replies: 5
Views: 99

cisplatin

can someone explain the cisplatin example again please
by EMurphy_2L
Mon Dec 02, 2019 2:20 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: H3O versus OH
Replies: 1
Views: 26

H3O versus OH

if given the amount of hydronium ions (in mol per liter) how do you find the amount of OH- ???
do you have to find the pH, then the pOH is the difference of 14 and pH, and you find OH from pOH???
by EMurphy_2L
Sun Dec 01, 2019 5:16 pm
Forum: Industrial Examples
Topic: Biological examples of co-ordination compounds
Replies: 3
Views: 60

Re: Biological examples of co-ordination compounds

what we've talked about is -cisplatin (chemo drug in which only cis- molecule, not trans- will connect) -myglobin (square planar N with Fe + protein surrounding it) -hemoglobin (4 myoglobin-like molecules) and he put on the board these transition metals: -chromin (assists insulin in controlling bloo...
by EMurphy_2L
Sun Dec 01, 2019 5:10 pm
Forum: Naming
Topic: Naming for the final
Replies: 6
Views: 66

Re: Naming for the final

check out page 723 of the textbook!! but naming goes: [greek prefix; ligand name(s, in alphabetical order); transition metal cation; Roman numeral] the brackets represent coordination sphere the greek prefix (di, tri, tetra, penta) refers ti how many of the ligand there is the ligands have the endin...
by EMurphy_2L
Sun Dec 01, 2019 5:03 pm
Forum: Bronsted Acids & Bases
Topic: naming
Replies: 4
Views: 44

naming

how do we know acid/base names?
by EMurphy_2L
Sun Dec 01, 2019 5:03 pm
Forum: Conjugate Acids & Bases
Topic: confusing reaction
Replies: 1
Views: 57

confusing reaction

In the text book, they want you to draw Cl- and SO3 reacting. I understand that Cl- is a base but SO3 seems like a stable molecule when I draw the Lewis structure... why would it react??
by EMurphy_2L
Sun Dec 01, 2019 5:01 pm
Forum: Lewis Acids & Bases
Topic: BF3
Replies: 2
Views: 26

BF3

Is BF3 a Lewis acid or Lewis base? and why?
by EMurphy_2L
Mon Nov 25, 2019 4:09 pm
Forum: Naming
Topic: 9C.3 D
Replies: 3
Views: 47

Re: 9C.3 D

the prefix isn't included when figuring out alphabetical order. yes, Bisoxalato comes before diaqua in the alphabet but we need to look at the actual ligand, not the prefix, so diaqua comes before bisoxalato because "di" and "bis" aren't part of the ligand name
by EMurphy_2L
Mon Nov 25, 2019 4:05 pm
Forum: Bronsted Acids & Bases
Topic: Weak vs Strong Acid/Bases
Replies: 3
Views: 35

Re: Weak vs Strong Acid/Bases

im not sure if those 50% acid/bases exist/what they are classified as but... for the purposes of this class.. we assume a strong acid/base completely ionizes (aka 100%) and a weak acid/base is anything less, the proportion of which can be found in the ratio of products to reactants. a larger equilib...
by EMurphy_2L
Mon Nov 25, 2019 3:58 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: ligands
Replies: 2
Views: 47

ligands

is an atom with two lone pairs polydentate? or no because is cannot form a ring?
by EMurphy_2L
Mon Nov 25, 2019 3:50 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: chemical equation states
Replies: 2
Views: 35

chemical equation states

how do you know what the state of a molecule in a chemical equation is? are all acids aqueous? and then when water is added, both products are aqueous as well?
by EMurphy_2L
Mon Nov 25, 2019 3:13 pm
Forum: Naming
Topic: Roman numerals
Replies: 4
Views: 45

Roman numerals

does the Roman numeral indicate the charge of the molecule or the charge of the metal in the coordination compound??
by EMurphy_2L
Thu Nov 21, 2019 6:06 pm
Forum: Sigma & Pi Bonds
Topic: sigma and pi bonds
Replies: 3
Views: 29

Re: sigma and pi bonds

If you see a single bond, it will be a sigma bond. Pi bonds occur whenever there's a p-orbital interacting with another p-orbital, so when there's a double bond, one will be a pi bond and the other will be a sigma bond (because if you have 2 pi bonds the bond will break). so every bond ever? in pol...
by EMurphy_2L
Thu Nov 21, 2019 5:55 pm
Forum: Sigma & Pi Bonds
Topic: sigma and pi bonds
Replies: 3
Views: 29

sigma and pi bonds

is there a sigma bond on every polar bond? or just every bond in general? and then every bond after that is a pi bond?

I guess I just don't get the general concept hahah if anyone can help me out!!
by EMurphy_2L
Thu Nov 21, 2019 3:34 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: in need of test 2 practice problems
Replies: 5
Views: 76

in need of test 2 practice problems

hello! does anyone have practice problems for test 2? from any UA sessions or anything? please copy here (or email/text me)
by EMurphy_2L
Wed Nov 20, 2019 6:59 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: affect of size
Replies: 2
Views: 52

affect of size

how do ions affect polarizability?? how does the loss of electrons change size and how does that change polarizability?
the question is from:arrange these in increasing polarizability: Cl-, Br-, N-3, O-2
by EMurphy_2L
Wed Nov 20, 2019 6:45 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: XA2E2
Replies: 9
Views: 68

Re: XA2E2

is AX3E also called bent
by EMurphy_2L
Wed Nov 20, 2019 5:58 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: pi bonding
Replies: 3
Views: 39

pi bonding

is a pi bond two bonds?? bound in two places, above and below the internuclear axis?
by EMurphy_2L
Wed Nov 20, 2019 5:34 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: cis- and trans- molecules
Replies: 2
Views: 25

cis- and trans- molecules

what are the definitions of cis-and trans- molecules??
also, is cis- synonymous with polar and trans- synonymous with non-polar??
by EMurphy_2L
Wed Nov 20, 2019 5:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: XA2E2
Replies: 9
Views: 68

XA2E2

for VSEPR formula XA2E2, is it called bent?? is this just a tetrahedral shape with two missing?
by EMurphy_2L
Wed Nov 20, 2019 3:37 pm
Forum: Electronegativity
Topic: electronegativity of hydrogen
Replies: 3
Views: 44

electronegativity of hydrogen

what is the electronegativity of hydrogen? like if a question asks which has greater ionic character (ie, more EN difference) between HCl and HI or between CH4 and CF4? similarly, where can you imagine hydrogen on the periodic table in terms of where it fits in trends?
by EMurphy_2L
Mon Nov 11, 2019 10:03 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge
Replies: 16
Views: 102

Re: Formal charge

also, if the molecule has a charge (like CNO-) then the sum of all three charges should be that number
by EMurphy_2L
Mon Nov 11, 2019 9:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Hydrogen Bonding
Replies: 3
Views: 27

Re: Hydrogen Bonding

molecules with hydrogen bonding will have much higher boiling points because they are much more difficult to break apart
by EMurphy_2L
Mon Nov 11, 2019 9:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR formula for molecules of the same atom
Replies: 3
Views: 27

VSEPR formula for molecules of the same atom

What is the VSEPR formula for I3- ?
Also, there are three lone pairs on the central atom I so what would the formula be?
by EMurphy_2L
Mon Nov 11, 2019 9:46 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: central atoms
Replies: 7
Views: 52

central atoms

how do you know the central atom since it's not always that with lowest ionization energy?
For example, why is Cl the central atom in ClO2+ ?
by EMurphy_2L
Mon Nov 11, 2019 9:44 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: when there are three atoms
Replies: 1
Views: 27

when there are three atoms

In a molecule such as IO2F2, oxygens will be double bonded to the iodine and have two lone pairs while fluorine will be single bonded to the iodine and have three lone pairs. Will this still form a tetrahedral shape?? Or is it different because the number of lone pairs are different, even though its...
by EMurphy_2L
Mon Nov 04, 2019 7:38 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic
Replies: 3
Views: 46

Re: Ionic

I do not think we will be asked to say anything concrete about bonds between atoms with an electronegativity difference between 1.5 and 2, that seems very unreasonable. We may be asked to compare bond characteristics but I think it would be pretty clear and just using period trends. For example, tex...
by EMurphy_2L
Mon Nov 04, 2019 7:34 pm
Forum: Resonance Structures
Topic: Formal charge and resonance
Replies: 5
Views: 64

Re: Formal charge and resonance

They're correct in that resonance structures will all have the same formal charge because it is a completely equal chance that different resonance structures will form/ they exist simultaneously and equally. Additionally, if two structures of the same element have different formal charges, it is mor...
by EMurphy_2L
Mon Nov 04, 2019 7:29 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Atoms after f-block
Replies: 2
Views: 41

Atoms after f-block

How would you write the electron configuration for Bi +3 or really any element after 5d?

Also, will we be expected to know this on the midterm? It was included in our homework problems (2A.5)
by EMurphy_2L
Mon Nov 04, 2019 7:27 pm
Forum: Octet Exceptions
Topic: noble gas bonding
Replies: 3
Views: 40

noble gas bonding

How would a noble gas ever bond? What type of bond is this?
In textbook question 2C.9, I don't understand how XeF2 could ever exist because F needs one electron each and Xe needs none. How are we supposed to draw this?
by EMurphy_2L
Mon Nov 04, 2019 7:26 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: "Polarizing power" in textbook
Replies: 2
Views: 42

"Polarizing power" in textbook

Does having great polarizing power mean a small atomic radius? and having great polarizability mean having a large atomic radius?
by EMurphy_2L
Mon Oct 28, 2019 4:15 pm
Forum: Ionic & Covalent Bonds
Topic: # of unpaired electrons
Replies: 1
Views: 23

Re: # of unpaired electrons

in a d-orbtial, there are 5 shells. they get filled with one electron each and then a second electron each (like 1 2 3 4 5 1 2 3 4 5). so with a 3d8 orbital, you fill 1 2 3 4 5 1 2 3-- the first three shells have two electrons (a complete shell, a pair) and the last two shells have one electron so t...

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