Search found 54 matches
- Sun Mar 17, 2019 9:14 am
- Forum: Zero Order Reactions
- Topic: Zero order reaction
- Replies: 8
- Views: 969
Zero order reaction
How do we determine if a reactant is zero order?
- Sun Mar 17, 2019 9:13 am
- Forum: Second Order Reactions
- Topic: Plotting second order reactions
- Replies: 3
- Views: 638
Plotting second order reactions
How do we plot a second order reaction on a graph to get a straight line?
- Sun Mar 17, 2019 9:12 am
- Forum: General Rate Laws
- Topic: fast step before slow step
- Replies: 2
- Views: 574
fast step before slow step
Why do we have to assume that the slow step comes after the fast step?
- Sun Mar 17, 2019 9:12 am
- Forum: General Rate Laws
- Topic: Slow elementary step
- Replies: 2
- Views: 518
Slow elementary step
Why is the slow step the rate determining step?
- Sun Mar 17, 2019 9:10 am
- Forum: Balancing Redox Reactions
- Topic: How to balance half reaction
- Replies: 5
- Views: 805
How to balance half reaction
How do we use OH- to balance out half reactions in alkaline solutions?
- Sun Mar 17, 2019 9:10 am
- Forum: Balancing Redox Reactions
- Topic: Balancing alkaline solutions
- Replies: 1
- Views: 450
Balancing alkaline solutions
When balancing alkaline half reactions why do we use OH- instead?
- Fri Mar 08, 2019 9:01 am
- Forum: Student Social/Study Group
- Topic: Switching good discussion time for chem 14C lec 1
- Replies: 1
- Views: 520
Switching good discussion time for chem 14C lec 1
Hi! Because of scheduling issues would anyone in chem 14c lec 1 MWF 12-1250 next quarter like to switch into my discussion on wed at 2-250??
- Tue Mar 05, 2019 10:23 pm
- Forum: General Rate Laws
- Topic: unique rate of reaction
- Replies: 2
- Views: 321
unique rate of reaction
what does the problem mean when referring to the unique rate of reaction?
- Sun Mar 03, 2019 2:47 pm
- Forum: Van't Hoff Equation
- Topic: units of T
- Replies: 5
- Views: 808
units of T
would T be in kelvins?
- Sun Mar 03, 2019 2:47 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: standard cell potential negative and positive
- Replies: 2
- Views: 256
standard cell potential negative and positive
what's the significance of the standard cell potential being either negative or positive?
- Sun Mar 03, 2019 2:45 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: van't hoff equation
- Replies: 6
- Views: 709
van't hoff equation
How do you find either K1 or K2 in the equation if it's bracketed within ln?
- Sun Mar 03, 2019 2:44 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: standard cell potential
- Replies: 2
- Views: 288
standard cell potential
If we're only given the standard cell potential of reduction, how do we find the standard cell potential of oxidation?
- Sun Mar 03, 2019 2:43 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: difference between galvanic and voltaic
- Replies: 4
- Views: 2950
difference between galvanic and voltaic
What's the difference between a galvanic cell and a voltaic cell?
- Sun Mar 03, 2019 2:43 pm
- Forum: Balancing Redox Reactions
- Topic: oxidation states
- Replies: 4
- Views: 539
oxidation states
how do we calculate the oxidation states?
- Sun Mar 03, 2019 2:42 pm
- Forum: Balancing Redox Reactions
- Topic: balancing redox reactions
- Replies: 5
- Views: 511
balancing redox reactions
When writing the half reactions, when do we know to add on H+ or H2O to the equation?
- Sun Mar 03, 2019 2:41 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: delta G
- Replies: 5
- Views: 676
delta G
What does delta G represent?
- Sun Feb 17, 2019 1:11 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: calculating delta G
- Replies: 4
- Views: 425
calculating delta G
If you're given standard conditions of delta H and delta S, will T= 25+273.15 since the standard conditions assume T is at 25 celsius?
- Sun Feb 17, 2019 1:08 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: constant C
- Replies: 7
- Views: 1005
constant C
What's the difference between C(sub v), C (sub p), and just C?
- Sun Feb 17, 2019 1:07 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: calculating delta S
- Replies: 4
- Views: 442
calculating delta S
why is (V2/V1) equal to (P1/P2)?
- Sun Feb 17, 2019 1:07 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: reversible and irreversible processes
- Replies: 9
- Views: 1474
reversible and irreversible processes
what's the difference between reversible and irreversible?
- Sun Feb 17, 2019 1:06 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: state functions and properties
- Replies: 11
- Views: 5931
state functions and properties
What's the definition of a state property?
- Sun Feb 17, 2019 1:04 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Gibb's Free energy
- Replies: 4
- Views: 462
Gibb's Free energy
When is deltaG negative and positive? What's the significance?
- Tue Jan 29, 2019 11:12 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: pH of AlCl3
- Replies: 1
- Views: 291
pH of AlCl3
How do we calculate the pH of 0.055 M AlCl3 when the equilibrium constant isn't given?
- Mon Jan 21, 2019 7:34 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: calculating x cubically
- Replies: 2
- Views: 274
calculating x cubically
how do we solve for x when it comes out to a cubic function?
- Mon Jan 21, 2019 7:30 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ignoring x validity
- Replies: 6
- Views: 838
ignoring x validity
so if we ignore x and it isn't less than 5% of the original molarity and is therefore invalid, do we just continue to calculate x quadratically?
- Mon Jan 21, 2019 7:25 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ignoring x
- Replies: 16
- Views: 3208
ignoring x
so for some of the ICE table calculations we ignore x and just pretend it's 0, when do we do that?
- Mon Jan 21, 2019 7:25 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ignoring x
- Replies: 10
- Views: 841
ignoring x
so for some of the ICE table calculations we ignore x and just pretend it's 0, when do we do that?
- Sun Jan 13, 2019 7:49 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Change in Pressure
- Replies: 4
- Views: 276
Change in Pressure
How does a change in pressure affect the reaction?
- Sun Jan 13, 2019 7:49 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Q and K
- Replies: 8
- Views: 573
Q and K
How are Q and K related?
- Sun Jan 13, 2019 7:48 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE Tables
- Replies: 3
- Views: 351
ICE Tables
Can you use ICE tables for partial pressure?
- Sun Dec 02, 2018 8:50 pm
- Forum: Amphoteric Compounds
- Topic: Amphoteric compounds besides water
- Replies: 6
- Views: 493
Amphoteric compounds besides water
what are some amphoteric compounds besides water, Dr. Lavelle didn't go over any besides water in lecture
- Sun Dec 02, 2018 8:40 pm
- Forum: Bronsted Acids & Bases
- Topic: Bronsted Base
- Replies: 2
- Views: 277
Bronsted Base
What is the difference between Bronsted and Lewis bases?
- Sun Dec 02, 2018 8:36 pm
- Forum: Naming
- Topic: drawing ligands
- Replies: 6
- Views: 535
drawing ligands
why did Dr. Lavelle draw some of the NH3 ligands as NH3 and H3N on the molecule?
- Sat Nov 24, 2018 8:41 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR model formula
- Replies: 3
- Views: 324
VSEPR model formula
how does the VSEPR model formula work? what if there's two central atoms and two lone pairs on each, would the formula have E4 or E2?
- Sat Nov 24, 2018 8:37 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: freely rotating bonds
- Replies: 1
- Views: 214
freely rotating bonds
why can't atoms freely rotate around double and triple bonds?
- Sat Nov 24, 2018 8:36 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: What is VSPER
- Replies: 14
- Views: 946
What is VSPER
what does VSPER stand for and do we need to memorize it?
- Sun Nov 11, 2018 10:46 pm
- Forum: Dipole Moments
- Topic: How do you draw dipole moments
- Replies: 6
- Views: 987
How do you draw dipole moments
Do you draw it towards the least or most electronegative atom
- Sun Nov 11, 2018 10:44 pm
- Forum: Bond Lengths & Energies
- Topic: Bond lengths and resonance structure
- Replies: 2
- Views: 296
Bond lengths and resonance structure
Do you just take the averages of the bond lengths in a resonance structure?
- Sun Nov 11, 2018 10:41 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal charge on central atom
- Replies: 5
- Views: 1060
Formal charge on central atom
Why does the formal charge on the central atom have to be as close to zero as possible?
- Sun Nov 04, 2018 8:22 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Exceptions to electron configuration
- Replies: 3
- Views: 257
Exceptions to electron configuration
What are the exceptions to how atoms fill up their orbitals for electron configurations>
- Sun Nov 04, 2018 8:20 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal charges in charged molecules
- Replies: 5
- Views: 290
Formal charges in charged molecules
How do you determine where the negative formal charge lies in a negatively charged molecule?
- Sun Nov 04, 2018 8:19 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge on Central Atom
- Replies: 9
- Views: 1524
Formal Charge on Central Atom
Why does the formal charge on the central atom have to be as close to 0 as possible?
- Sun Oct 28, 2018 8:55 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Degeneracy
- Replies: 7
- Views: 487
Degeneracy
What does degeneracy of an orbital mean
- Sun Oct 28, 2018 8:53 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron affinity
- Replies: 1
- Views: 248
Electron affinity
Can someone explain to me why the electron affinity trend is up and to the right?
- Sun Oct 28, 2018 8:52 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Ionization energy
- Replies: 2
- Views: 214
Ionization energy
What is ionization energy and why is its trend up and to the right?
- Sun Oct 21, 2018 7:59 pm
- Forum: DeBroglie Equation
- Topic: Remembering mass of electrons for tests
- Replies: 6
- Views: 539
Remembering mass of electrons for tests
Will we have to remember the mass of an electron for the tests/quizzes?
- Sun Oct 21, 2018 7:55 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: h with a line through it?
- Replies: 8
- Views: 1872
h with a line through it?
So Dr. Lavelle was talking about how h/4pi is the same as h with that line through it/2pi, can someone explain the difference?
- Wed Oct 17, 2018 9:03 pm
- Forum: DeBroglie Equation
- Topic: Energy of ejected electron from energy of light
- Replies: 1
- Views: 235
Energy of ejected electron from energy of light
Can someone explain how I'd go about calculating the freq/wavelength/energy of an electron when only given the energy of the light used to eject said electron?
- Sat Oct 13, 2018 1:59 pm
- Forum: DeBroglie Equation
- Topic: De Broglie Equation Dividing J*s by kg*m/s
- Replies: 2
- Views: 1011
De Broglie Equation Dividing J*s by kg*m/s
So for De Broglie's Equation, you have to divide planck's constant (h) by momentum. But the units of h are in J*s and momentum is in kg*m/s, can someone explain to me how the units cancel out to get a unit appropriate for wavelength?
- Sat Oct 13, 2018 1:52 pm
- Forum: DeBroglie Equation
- Topic: Measurable wave length properties
- Replies: 3
- Views: 317
Re: Measurable wave length properties
Yeah I think Dr. Lavelle's point is that the wavelength is only measurable in a quantum context. It doesn't seem to be something to stress over for the quizzes and tests.
- Sat Oct 13, 2018 1:47 pm
- Forum: Properties of Light
- Topic: The PhotoElectric Effect
- Replies: 2
- Views: 195
Re: The PhotoElectric Effect
So if light only had wave properties then increasing the intensity of the light should allow light of an insufficient frequency to eject electrons. But this is not the case, so we can consider photons as packets of energy where each photon will interact with one electron.
- Sun Oct 07, 2018 1:36 pm
- Forum: Properties of Light
- Topic: C=Delta x V
- Replies: 6
- Views: 561
Re: C=Delta x V
I think you mean lambda instead of delta, but i think the equation only considers the wavelength (lambda) and the frequency (v).
- Sun Oct 07, 2018 12:52 pm
- Forum: Limiting Reactant Calculations
- Topic: Mole Ratios Within the Conversion
- Replies: 3
- Views: 337
Re: Mole Ratios Within the Conversion
So in the case of 3 moles CO2 and 6 moles of H2O, CO2 is the limiting reactant as CO2 and H2O react in a 1:1 ratio. Since the reaction produces an equal number of moles of O2, there will be 3 moles of O2 produced and just multiply that by O2's molar mass to get the grams of O2.
- Sun Oct 07, 2018 12:45 pm
- Forum: Limiting Reactant Calculations
- Topic: Calculating Maximum Mass
- Replies: 5
- Views: 1297
Re: Calculating Maximum Mass
I think for part b you'd have to use stoichiometry to find the number of moles for both products. To get moles NaOH you'd divide 2.00g NaOH by its molar mass and for the Copper Nitrate you'd multiply its concentration by its number of litres. Then you'd find the limiting reactant and treat it like a...