Search found 128 matches
- Wed Mar 11, 2020 4:48 pm
- Forum: Student Social/Study Group
- Topic: notes
- Replies: 1
- Views: 302
notes
hi could someone send me their notes from Friday and Mondays classes (3/6 and 3/9) please!
- Wed Mar 11, 2020 4:43 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: salt bridge
- Replies: 11
- Views: 580
Re: salt bridge
a porous disk can also be used for this purpose! that's just a membrane which balances charge
- Wed Mar 11, 2020 4:41 pm
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 329207
Re: Final Jitters
hopefully now, having the test environment removed from the situation helps!
- Wed Mar 11, 2020 4:39 pm
- Forum: First Order Reactions
- Topic: rate constants
- Replies: 30
- Views: 1285
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!
- Wed Mar 11, 2020 4:31 pm
- Forum: Administrative Questions and Class Announcements
- Topic: final
- Replies: 14
- Views: 873
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?
- 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: 257
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
- 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: 257
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?
- Wed Mar 04, 2020 5:25 pm
- Forum: Balancing Redox Reactions
- Topic: inferring half rxns from equation
- Replies: 4
- Views: 358
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????
- 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: 450
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
- Wed Mar 04, 2020 5:17 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: 6N 17: Cell doing work
- Replies: 3
- Views: 217
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)
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)
- Wed Mar 04, 2020 5:15 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: 6N 17: Cell doing work
- Replies: 3
- Views: 217
Re: 6N 17: Cell doing work
Yes! work being negative means its doing work and G being negative means its spontaneous/favorable
- Wed Mar 04, 2020 5:12 pm
- Forum: Balancing Redox Reactions
- Topic: 6L.7
- Replies: 1
- Views: 152
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!
- Wed Mar 04, 2020 4:56 pm
- Forum: Balancing Redox Reactions
- Topic: inferring half rxns from equation
- Replies: 4
- Views: 358
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...
- Wed Mar 04, 2020 4:50 pm
- Forum: Balancing Redox Reactions
- Topic: confusing homework question
- Replies: 4
- Views: 359
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?
- Wed Feb 26, 2020 6:09 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidizing agent and Reducing Agent
- Replies: 4
- Views: 375
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
the compound which is reduced is the oxidizing agent because it impacts the other compound
- Wed Feb 26, 2020 4:48 pm
- Forum: Balancing Redox Reactions
- Topic: common oxidation numbers
- Replies: 3
- Views: 264
common oxidation numbers
what are common oxidation numbers we should know, besides oxygen being 2-??
- Wed Feb 26, 2020 4:46 pm
- Forum: Balancing Redox Reactions
- Topic: balancing in acidic solutions
- Replies: 4
- Views: 360
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+....
In my discussion my TA used H3O+ but the textbook uses H+....
- Wed Feb 26, 2020 4:03 pm
- Forum: Balancing Redox Reactions
- Topic: oxidation numbers
- Replies: 3
- Views: 278
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)
for example, Cr2O7(2-) + C2H5OH --> Cr(3+) + C2H4O
how do you know the oxidation numbers of C and Cr (please be very explicit lol)
- Wed Feb 26, 2020 3:56 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Test 2
- Replies: 2
- Views: 207
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.
- Mon Feb 24, 2020 1:04 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Oxidation versus reduction
- Replies: 9
- Views: 425
Re: Oxidation versus reduction
anode is left and cathode is right unless otherwise stated !
- Mon Feb 24, 2020 1:03 am
- Forum: Administrative Questions and Class Announcements
- Topic: Test 2
- Replies: 5
- Views: 438
Re: Test 2
yes!
- Mon Feb 24, 2020 1:02 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: salt bridge
- Replies: 5
- Views: 391
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
- Mon Feb 24, 2020 1:01 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: midterm
- Replies: 5
- Views: 442
midterm
how long after the test can we discuss grading with our TA?
- 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: 363
Re: Test 2
second page of outline 4 (not on midterm) and all of outline 5
- Wed Feb 12, 2020 1:13 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: spontaneity
- Replies: 7
- Views: 348
Re: spontaneity
thanks! what about part 1?
- Wed Feb 12, 2020 1:08 am
- Forum: Administrative Questions and Class Announcements
- Topic: Pizza Rolls REVIEW Session DOWNLOAD HERE
- Replies: 67
- Views: 5246
Re: Pizza Rolls REVIEW Session DOWNLOAD HERE
HELP for question 6, why is ΔU=0 and ΔS=0 for all three changes?
- Tue Feb 11, 2020 1:37 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Pizza Rolls REVIEW Session DOWNLOAD HERE
- Replies: 67
- Views: 5246
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...
- Tue Feb 11, 2020 1:32 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Pizza Rolls REVIEW Session DOWNLOAD HERE
- Replies: 67
- Views: 5246
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...
- Tue Feb 11, 2020 1:29 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Pizza Rolls REVIEW Session DOWNLOAD HERE
- Replies: 67
- Views: 5246
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...
- Tue Feb 11, 2020 12:01 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Go=0
- Replies: 7
- Views: 362
Go=0
when does G*=0
- Mon Feb 10, 2020 11:52 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: isothermal
- Replies: 2
- Views: 73
isothermal
if ΔT=0, does ΔU=0?
- Mon Feb 10, 2020 11:35 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: S and H
- Replies: 1
- Views: 121
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
- Mon Feb 10, 2020 11:35 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: spontaneity
- Replies: 7
- Views: 348
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.
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.
- Mon Feb 10, 2020 8:10 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: pH
- Replies: 3
- Views: 134
pH
Can someone please explain why solutions of weak acids have higher pH values than solutions of strong acids at the same concentration.
- Sat Feb 08, 2020 6:14 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: q
- Replies: 1
- Views: 38
q
basic question... what is q? and what does it mean when it's qp or qv and everything?
- Sat Feb 08, 2020 5:35 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: units
- Replies: 3
- Views: 126
units
what are the units of S, U, H, and G?
- Sat Feb 08, 2020 5:33 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: internal energy
- Replies: 3
- Views: 174
internal energy
so does ΔU = ΔH at constant pressure and constant volume?
- Sat Feb 08, 2020 4:03 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: biological examples
- Replies: 2
- Views: 179
biological examples
can someone explain the biological examples for equilibrium of ATP hydrolysis and osmotic pressure please!
- Sat Feb 08, 2020 3:03 pm
- Forum: Phase Changes & Related Calculations
- Topic: Steam burns more than water
- Replies: 5
- Views: 229
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!
- Sun Feb 02, 2020 4:26 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Extra Credit
- Replies: 7
- Views: 406
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...
- Sun Feb 02, 2020 4:24 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: State Property vs Function
- Replies: 2
- Views: 75
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!!
- Sun Feb 02, 2020 4:23 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE
- Replies: 20
- Views: 815
Re: ICE
you need two values! these are usually only one starting concentration and K OR one starting concentration and one ending concentration
- Sun Feb 02, 2020 4:22 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: 4B 11
- Replies: 2
- Views: 85
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 ....
U equal to some other variable ....
- Sun Feb 02, 2020 4:20 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: 4A.1
- Replies: 12
- Views: 450
Re: 4A.1
open- matter and energy transfer
closed- energy transfer
isolated- no transfer
closed- energy transfer
isolated- no transfer
- Thu Jan 23, 2020 1:37 pm
- Forum: Ideal Gases
- Topic: test 1
- Replies: 9
- Views: 348
test 1
enthalpy and Wednesday's lecture won't be on test 1, right?
- Thu Jan 23, 2020 1:28 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Ka and Kb
- Replies: 10
- Views: 304
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?
- Thu Jan 23, 2020 1:24 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Ka and Kb
- Replies: 10
- Views: 304
Ka and Kb
so if Kb<10 -3 means it's a weak base, does Ka>10 3 mean it's a weak acid?
- Mon Jan 20, 2020 5:45 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE table and X
- Replies: 6
- Views: 265
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
- Mon Jan 20, 2020 5:43 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Sig Figs for pH/pOH
- Replies: 7
- Views: 300
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)
- Mon Jan 20, 2020 5:42 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Endothermic vs Exothermic
- Replies: 7
- Views: 290
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...
- Mon Jan 20, 2020 5:38 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE tables
- Replies: 5
- Views: 150
ICE tables
when do we use an ICE table? like what words in a question should signal us to use one?
- Mon Jan 20, 2020 5:37 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K
- Replies: 5
- Views: 213
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?
- Tue Jan 14, 2020 5:38 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Weak Acids/Bases
- Replies: 2
- Views: 63
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
- Mon Jan 13, 2020 5:09 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kc and Kp
- Replies: 8
- Views: 263
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?
- Mon Jan 13, 2020 5:06 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Autoprotolysis of water endo or exo?
- Replies: 4
- Views: 534
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)...
- Mon Jan 13, 2020 5:04 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Calculating for Pressure
- Replies: 5
- Views: 176
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
- 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: 202
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...
- Mon Jan 13, 2020 4:59 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Reaction Quotient
- Replies: 11
- Views: 250
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)
- Wed Jan 08, 2020 4:06 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: reactants compared to products
- Replies: 4
- Views: 128
reactants compared to products
if you start with a higher concentration of reactants, will the equilibrium concentration of the products be larger?
- Wed Jan 08, 2020 4:05 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: changing K
- Replies: 4
- Views: 164
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?
- Wed Jan 08, 2020 4:00 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kc and Kp
- Replies: 8
- Views: 263
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?
- Wed Jan 08, 2020 3:39 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: units
- Replies: 3
- Views: 163
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
- Tue Jan 07, 2020 3:46 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Homework 1
- Replies: 18
- Views: 551
Re: Homework 1
for week one its due in lecture on Friday! then all other weeks it's due in discussion
- Tue Dec 03, 2019 6:39 pm
- Forum: Naming
- Topic: naming bases
- Replies: 1
- Views: 122
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?
- Tue Dec 03, 2019 6:30 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: oxygen in chelating agent
- Replies: 1
- Views: 113
oxygen in chelating agent
if double bound oxygen is in Lewis base, is this polydentate? because oxygen has two lone pairs?
- 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: 97
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?
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?
- Tue Dec 03, 2019 6:23 pm
- Forum: *Shrodinger Equation
- Topic: schrodingers equation
- Replies: 8
- Views: 620
schrodingers equation
do we really need to know this? is this really used in anything?
- Tue Dec 03, 2019 6:22 pm
- Forum: Properties of Light
- Topic: photons
- Replies: 3
- Views: 231
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?
also, is intensity proportional to electrons emitted (only if able to remove electron already) like doubled intensity results in doubled amount of electrons emitted?
- Mon Dec 02, 2019 10:45 pm
- Forum: Biological Examples
- Topic: cisplatin
- Replies: 5
- Views: 359
cisplatin
can someone explain the cisplatin example again please
- Mon Dec 02, 2019 2:20 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: H3O versus OH
- Replies: 1
- Views: 2388
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???
do you have to find the pH, then the pOH is the difference of 14 and pH, and you find OH from pOH???
- Sun Dec 01, 2019 5:16 pm
- Forum: Industrial Examples
- Topic: Biological examples of co-ordination compounds
- Replies: 3
- Views: 780
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...
- Sun Dec 01, 2019 5:10 pm
- Forum: Naming
- Topic: Naming for the final
- Replies: 6
- Views: 435
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...
- Sun Dec 01, 2019 5:03 pm
- Forum: Bronsted Acids & Bases
- Topic: naming
- Replies: 4
- Views: 264
naming
how do we know acid/base names?
- Sun Dec 01, 2019 5:03 pm
- Forum: Conjugate Acids & Bases
- Topic: confusing reaction
- Replies: 1
- Views: 140
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??
- Sun Dec 01, 2019 5:01 pm
- Forum: Lewis Acids & Bases
- Topic: BF3
- Replies: 2
- Views: 89
BF3
Is BF3 a Lewis acid or Lewis base? and why?
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
- Mon Nov 25, 2019 4:05 pm
- Forum: Bronsted Acids & Bases
- Topic: Weak vs Strong Acid/Bases
- Replies: 3
- Views: 185
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...
- Mon Nov 25, 2019 3:58 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: ligands
- Replies: 2
- Views: 117
ligands
is an atom with two lone pairs polydentate? or no because is cannot form a ring?
- Mon Nov 25, 2019 3:50 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: chemical equation states
- Replies: 2
- Views: 210
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?
- Mon Nov 25, 2019 3:13 pm
- Forum: Naming
- Topic: Roman numerals
- Replies: 4
- Views: 215
Roman numerals
does the Roman numeral indicate the charge of the molecule or the charge of the metal in the coordination compound??
- Thu Nov 21, 2019 6:06 pm
- Forum: Sigma & Pi Bonds
- Topic: sigma and pi bonds
- Replies: 3
- Views: 140
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...
- Thu Nov 21, 2019 5:55 pm
- Forum: Sigma & Pi Bonds
- Topic: sigma and pi bonds
- Replies: 3
- Views: 140
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!!
I guess I just don't get the general concept hahah if anyone can help me out!!
- 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: 250
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)
- Wed Nov 20, 2019 6:59 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: affect of size
- Replies: 2
- Views: 314
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
the question is from:arrange these in increasing polarizability: Cl-, Br-, N-3, O-2
- Wed Nov 20, 2019 6:45 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: XA2E2
- Replies: 9
- Views: 401
Re: XA2E2
is AX3E also called bent
- 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: 236
pi bonding
is a pi bond two bonds?? bound in two places, above and below the internuclear axis?
- 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: 181
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??
also, is cis- synonymous with polar and trans- synonymous with non-polar??
- Wed Nov 20, 2019 5:22 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: XA2E2
- Replies: 9
- Views: 401
XA2E2
for VSEPR formula XA2E2, is it called bent?? is this just a tetrahedral shape with two missing?
- Wed Nov 20, 2019 3:37 pm
- Forum: Electronegativity
- Topic: electronegativity of hydrogen
- Replies: 3
- Views: 300
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?
- Mon Nov 11, 2019 10:03 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal charge
- Replies: 16
- Views: 827
Re: Formal charge
also, if the molecule has a charge (like CNO-) then the sum of all three charges should be that number
- Mon Nov 11, 2019 9:53 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Hydrogen Bonding
- Replies: 3
- Views: 119
Re: Hydrogen Bonding
molecules with hydrogen bonding will have much higher boiling points because they are much more difficult to break apart
- Mon Nov 11, 2019 9:48 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR formula for molecules of the same atom
- Replies: 3
- Views: 104
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?
Also, there are three lone pairs on the central atom I so what would the formula be?
- Mon Nov 11, 2019 9:46 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: central atoms
- Replies: 7
- Views: 306
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+ ?
For example, why is Cl the central atom in ClO2+ ?
- Mon Nov 11, 2019 9:44 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: when there are three atoms
- Replies: 1
- Views: 95
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...
- Mon Nov 04, 2019 7:38 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic
- Replies: 3
- Views: 237
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...
- Mon Nov 04, 2019 7:34 pm
- Forum: Resonance Structures
- Topic: Formal charge and resonance
- Replies: 5
- Views: 146
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...
- Mon Nov 04, 2019 7:29 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Atoms after f-block
- Replies: 2
- Views: 202
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)
Also, will we be expected to know this on the midterm? It was included in our homework problems (2A.5)
- Mon Nov 04, 2019 7:27 pm
- Forum: Octet Exceptions
- Topic: noble gas bonding
- Replies: 3
- Views: 193
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?
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?
- Mon Nov 04, 2019 7:26 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: "Polarizing power" in textbook
- Replies: 2
- Views: 190
"Polarizing power" in textbook
Does having great polarizing power mean a small atomic radius? and having great polarizability mean having a large atomic radius?
- Mon Oct 28, 2019 4:15 pm
- Forum: Ionic & Covalent Bonds
- Topic: # of unpaired electrons
- Replies: 1
- Views: 78
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...