Search found 62 matches
- Sun Mar 17, 2019 9:15 pm
- Forum: Balancing Redox Reactions
- Topic: Triprotic
- Replies: 7
- Views: 3768
Re: Triprotic
yes it means 3 protons, which would have been phosphoric acid
- Sun Mar 17, 2019 9:13 pm
- Forum: Van't Hoff Equation
- Topic: Derivation
- Replies: 1
- Views: 734
Derivation
Can someone explain to me how to derive the Van't Hoff Equation again? Thank you!
- Fri Mar 15, 2019 5:26 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Textbook Question 7D.5 (7th edition)
- Replies: 1
- Views: 279
Textbook Question 7D.5 (7th edition)
Can someone help me out with question 7D.5 in the textbook (7th edition)? It's on page 630 in the textbook and deals with some rate laws with different temperatures. Thank you!!
- Sat Mar 09, 2019 7:37 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Bimolecular
- Replies: 13
- Views: 2274
Bimolecular
Can someone explain to me what bimolecular means? Thank you!!
- Sat Mar 09, 2019 7:36 pm
- Forum: First Order Reactions
- Topic: Pseudo Rate Laws
- Replies: 1
- Views: 232
Pseudo Rate Laws
Can someone explain to me what pseudo 1st order rate law and pseudo 2nd order rate law means? Thank you!!
- Sat Mar 09, 2019 7:35 pm
- Forum: General Rate Laws
- Topic: Rate Law Dependence
- Replies: 1
- Views: 207
Rate Law Dependence
Is the rate law dependent or independent of the concentration of the reactants? Why? Thank you!!
- Sun Feb 24, 2019 9:11 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Spontaneous Process
- Replies: 2
- Views: 288
Spontaneous Process
For a spontaneous process, is delta G positive or negative? Thank you!!
- Sun Feb 24, 2019 9:10 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram Lines
- Replies: 3
- Views: 349
Cell Diagram Lines
What is the difference between 1 and 2 lines in a cell diagram? Thank you!!
- Sun Feb 24, 2019 9:08 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Electron Flow Diagram
- Replies: 1
- Views: 258
Electron Flow Diagram
Can someone please explain to me the electron flow diagram that we covered in class? The one with the anode, cathode, and salt bridge. Thank you!!
- Sun Feb 17, 2019 11:56 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Max Work
- Replies: 5
- Views: 581
Max Work
What type of situation allows for max work? In terms of Pressure and Temperature. Thank you!!
- Sun Feb 17, 2019 11:55 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: K vs. Delta G
- Replies: 2
- Views: 569
K vs. Delta G
What is the relationship between K and delta G? Thank you!!
- Sun Feb 17, 2019 11:53 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Free Energy
- Replies: 5
- Views: 517
Free Energy
Is free energy a state function? If so how do we add it up? Thank you!!
- Sun Feb 10, 2019 10:38 pm
- Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Topic: Reversible vs. Irreversible
- Replies: 6
- Views: 604
Reversible vs. Irreversible
Can someone explain to me why W(reversible) is greater than W(irreversible)? Thank you!!
- Sun Feb 10, 2019 10:36 pm
- Forum: Calculating Work of Expansion
- Topic: Volume and Entropy
- Replies: 2
- Views: 342
Volume and Entropy
How does volume affect entropy when it increases or decreases? Why? Thank you!!
- Sun Feb 10, 2019 10:33 pm
- Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Topic: Degeneracy
- Replies: 3
- Views: 615
Degeneracy
Can someone explain to me what degeneracy is and how it relates to entropy? Thank you!!
- Sun Feb 03, 2019 9:05 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Bomb Calorimeter
- Replies: 3
- Views: 387
Bomb Calorimeter
What type of system is a bond calorimeter? Why? Thank you!!
- Sun Feb 03, 2019 9:04 pm
- Forum: Calculating Work of Expansion
- Topic: Bond Formation
- Replies: 3
- Views: 365
Bond Formation
Is a bond formation exothermic or endothermic? Why? Thank you!!
- Sun Feb 03, 2019 9:03 pm
- Forum: Calculating Work of Expansion
- Topic: Heat Capacity vs. Specific Heat Capacity
- Replies: 3
- Views: 421
Heat Capacity vs. Specific Heat Capacity
What is the difference between heat capacity and specific heat capacity? Thank you!!
- Sun Jan 27, 2019 5:38 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Standard Temperature
- Replies: 7
- Views: 672
Standard Temperature
What is the typical temperature of interest used for calculating delta H's? Thank you!!
- Sun Jan 27, 2019 5:37 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Standard Reaction Enthalpy
- Replies: 1
- Views: 219
Standard Reaction Enthalpy
Can someone explain what standard reaction enthalpy is to me? Thank you!!
- Sun Jan 27, 2019 5:35 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Hess's Method
- Replies: 2
- Views: 1519
Hess's Method
Can someone explain to me the Hess's method of calculating overall bond enthalpies? Thank you!!
- Sun Jan 20, 2019 4:06 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Bars vs. Molarity
- Replies: 5
- Views: 609
Bars vs. Molarity
Can someone explain to me when to use bars versus when to use molarity during partial pressure problems? Thank you!!
- Sun Jan 20, 2019 4:01 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: The Conjugate Seesaw
- Replies: 13
- Views: 1007
The Conjugate Seesaw
Can someone explain the conjugate seesaw to me? Thank you!!
- Sun Jan 20, 2019 3:58 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Autoprotolysis
- Replies: 3
- Views: 325
Autoprotolysis
Can someone tell me the autoprotolysis equation and explain it to me? Thank you!!
- Mon Jan 14, 2019 10:07 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Concentration Affecting K
- Replies: 7
- Views: 1074
Concentration Affecting K
Does adding more concentration affect K? Why or why not? Thank you!!
- Mon Jan 14, 2019 10:06 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Forward vs. Reverse Reactions
- Replies: 4
- Views: 1671
Forward vs. Reverse Reactions
Can someone explain to me how the values of Q and K determine whether the reactions proceeds forward or reverses? Thank you!!
- Mon Jan 14, 2019 10:04 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Homogeneous vs. Heterogenous [ENDORSED]
- Replies: 1
- Views: 138
Homogeneous vs. Heterogenous [ENDORSED]
Can someone explain homogeneous versus heterogeneous equilibriums to me? Thank you!!
- Sat Dec 08, 2018 11:38 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: test 2 question 1 (nitrogen gas molecule)
- Replies: 3
- Views: 515
Re: test 2 question 1 (nitrogen gas molecule)
In an unusual situation, one nitrogen gas molecule is trapped in an alveoli sac. Alveoli are tiny sacs in the lungs whose average diameter is 1.5x10^-4m.
(a) Find the uncertainty in velocity of the nitrogen molecule within the sac.
(a) Find the uncertainty in velocity of the nitrogen molecule within the sac.
- Sat Dec 08, 2018 8:24 pm
- Forum: DeBroglie Equation
- Topic: test 2 question 3 part C (X-ray)
- Replies: 1
- Views: 449
test 2 question 3 part C (X-ray)
What is the mass that we use for De Broglie's in this part of the problem? Is it just the weight of the electron or the weight or the electron scaled up with Avogadro's number because it said 1 mol of electrons in part A?
Thank you!!
Thank you!!
- Sat Dec 08, 2018 8:22 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: test 2 question 1 (nitrogen gas molecule)
- Replies: 3
- Views: 515
test 2 question 1 (nitrogen gas molecule)
Can someone explain part A of this question to me? Having some trouble with the math.
Thank you!!
Thank you!!
- Sat Dec 08, 2018 8:15 pm
- Forum: Photoelectric Effect
- Topic: test 2 question 5 (neon lamp)
- Replies: 1
- Views: 570
test 2 question 5 (neon lamp)
Can someone explain parts A and B of this question to me? I'm having a problem with the conceptual aspect of this question.
Thank you!!
Thank you!!
- Sat Dec 08, 2018 4:34 pm
- Forum: Administrative Questions and Class Announcements
- Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
- Replies: 118
- Views: 21825
Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
Thank you for your help this quarter!!!
- Sat Dec 08, 2018 4:32 pm
- Forum: Lewis Acids & Bases
- Topic: salts in acids and bases
- Replies: 2
- Views: 179
salts in acids and bases
Can someone explain to me the effect that salts have on acids and bases respectively?
Thank you!!
Thank you!!
- Sat Dec 08, 2018 4:29 pm
- Forum: Amphoteric Compounds
- Topic: Amphoteric vs. Amphiprotic
- Replies: 1
- Views: 294
Amphoteric vs. Amphiprotic
Can someone explain the difference between amphoteric and amphiprotic and give me an example of each?
Thank you!!
Thank you!!
- Thu Dec 06, 2018 9:59 pm
- Forum: Properties of Light
- Topic: Midterm Question 3B
- Replies: 1
- Views: 263
Midterm Question 3B
For midterm question 3B, can someone explain it to me? I keep getting down to the last few steps and messing it up.
Thank you!!
Thank you!!
- Sun Dec 02, 2018 6:14 pm
- Forum: Properties & Structures of Inorganic & Organic Bases
- Topic: Ionization in Water
- Replies: 8
- Views: 1068
Ionization in Water
What is the relationship between strong and weak bases and getting partially or fully ionized in water?
Thank you!!
Thank you!!
- Sun Dec 02, 2018 6:13 pm
- Forum: Properties & Structures of Inorganic & Organic Bases
- Topic: Amines
- Replies: 1
- Views: 402
Amines
I know amines come from ammonia, but what are some examples of amines?
Thank you!!
Thank you!!
- Sun Dec 02, 2018 6:11 pm
- Forum: Properties & Structures of Inorganic & Organic Bases
- Topic: Soapy Feels
- Replies: 4
- Views: 798
Soapy Feels
Why do bases have a soapy feel?
Thank you!!
Thank you!!
- Sun Nov 25, 2018 10:31 pm
- Forum: Hybridization
- Topic: pi bonds and rotation
- Replies: 3
- Views: 482
pi bonds and rotation
do pi bonds allow free rotation? if not, what happens to the bonds if there is rotation?
thank you!!
thank you!!
- Sun Nov 25, 2018 10:30 pm
- Forum: Hybridization
- Topic: sigma vs. pi bonds
- Replies: 4
- Views: 417
sigma vs. pi bonds
for single and double bonds, how many sigma and pi bonds are there respectively?
thank you!!
thank you!!
- Sun Nov 25, 2018 10:27 pm
- Forum: Hybridization
- Topic: hybridization of BeCl2
- Replies: 4
- Views: 384
hybridization of BeCl2
can someone explain to me the hybridization of BeCl2?
thank you!!
thank you!!
- Sun Nov 18, 2018 9:16 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Octahedral to Square Planar
- Replies: 7
- Views: 983
Octahedral to Square Planar
Can someone explain to me the transition from octahedral to square planar shape?
Thank you!!
Thank you!!
- Sun Nov 18, 2018 9:14 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Distorted Bond Angles
- Replies: 3
- Views: 3143
Distorted Bond Angles
Can someone explain to me what makes a bond angle distorted? And is it always slightly less than the typical angle when it is distorted?
Thank you!!
Thank you!!
- Sun Nov 18, 2018 9:11 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Trigonal Bipyramidal
- Replies: 3
- Views: 426
Trigonal Bipyramidal
Can someone explain to me the bond angles in a trigonal bipyramidal shape? (Phosphorous pentachloride for example)
- Sun Nov 11, 2018 3:55 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Hydrogen Bonding
- Replies: 7
- Views: 736
Hydrogen Bonding
What is the typical attractive energy for hydrogen bonds?
Thank you!!
Thank you!!
- Sun Nov 11, 2018 3:52 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Interaction Potential Energy
- Replies: 1
- Views: 83
Interaction Potential Energy
Why is interaction potential energy always negative?
Thank you!!
Thank you!!
- Sun Nov 11, 2018 3:50 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone Pairs on Neighboring Atoms
- Replies: 2
- Views: 277
Lone Pairs on Neighboring Atoms
Do lone pairs on neighboring atoms repel each other or are they attracted to each other? Whichever one it is, why is this the case?
Thank you!!
Thank you!!
- Sun Nov 04, 2018 2:23 pm
- Forum: Resonance Structures
- Topic: Resonance Structures on the Midterm
- Replies: 3
- Views: 347
Resonance Structures on the Midterm
When we draw Lewis structures on the midterm, do we have to draw all resonance structures or just give one structure that works? Thank you!!
- Sun Nov 04, 2018 2:20 pm
- Forum: Lewis Structures
- Topic: Octet Exceptions
- Replies: 1
- Views: 127
Octet Exceptions
When drawing Lewis structures, I know H, He, Li, Be, and all of Group 13 don't need to have a full octet. For Group 13 though, does this mean they don't ever have a full octet? Or they just don't need to have one? Thank you!!
- Sun Nov 04, 2018 2:18 pm
- Forum: Electronegativity
- Topic: Electron Affinity vs. Ionization Energy
- Replies: 8
- Views: 848
Electron Affinity vs. Ionization Energy
Can someone explain to me the difference between electron affinity and ionization energy? Also, could you explain the trends of both of them on the periodic table? Thank you!!
- Sun Oct 28, 2018 4:20 pm
- Forum: Ionic & Covalent Bonds
- Topic: Covalent Bonds
- Replies: 7
- Views: 713
Covalent Bonds
Do non-metals form cations or anions? Whichever one it is, why is this the case? Thank you!!
- Sun Oct 28, 2018 4:17 pm
- Forum: Ionic & Covalent Bonds
- Topic: Trend of Ionic Radii
- Replies: 5
- Views: 522
Trend of Ionic Radii
What is the trend of the size of ionic radii down the groups and across the periods? Thank you!!
- Sun Oct 28, 2018 4:13 pm
- Forum: Ionic & Covalent Bonds
- Topic: Unit of Atomic Radius
- Replies: 4
- Views: 392
Unit of Atomic Radius
What unit should we measure atomic radius in? I know it's a lot smaller than a meter but I don't remember what it was measured in exactly. Thank you!!
- Sun Oct 21, 2018 5:47 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: KJ/mol-->J
- Replies: 1
- Views: 879
KJ/mol-->J
Could someone explain how to convert from KJ/mol to J?
I must have missed this during the lecture
thank you!!
I must have missed this during the lecture
thank you!!
- Sun Oct 21, 2018 5:43 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Principle Quantum #
- Replies: 5
- Views: 728
Principle Quantum #
What is the significance of the principle quantum number?
I know it is represented by "n" but I don't know what it means exactly
I know it is represented by "n" but I don't know what it means exactly
- Sun Oct 21, 2018 5:40 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Energy levels of orbitals?
- Replies: 10
- Views: 781
Energy levels of orbitals?
I'm confused on the order of energy of the orbitals...
does it go s>p>d>f? or does it go s<p<d<f?
also, can someone explain why the order of the energy levels is like that?
thank you!!
does it go s>p>d>f? or does it go s<p<d<f?
also, can someone explain why the order of the energy levels is like that?
thank you!!
- Sun Oct 14, 2018 5:10 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: E(n)=-hR/n^2
- Replies: 3
- Views: 223
E(n)=-hR/n^2
In the equation E(n)=-hR/n^2, where does the negative come from?
Thank you!
Thank you!
- Sun Oct 14, 2018 5:03 pm
- Forum: Properties of Light
- Topic: Visible Light Spectrum
- Replies: 3
- Views: 238
Visible Light Spectrum
Are we supposed to memorize the visible light spectrum? I know the general idea that as wavelength increases energy decreases and vice versa, but are we supposed to know the numbers attached to the entire spectrum?
- Sun Oct 14, 2018 5:00 pm
- Forum: Properties of Light
- Topic: Example from Friday's Lecture (10/12/18)
- Replies: 3
- Views: 186
Example from Friday's Lecture (10/12/18)
Hi,
On Friday we went over a problem at the end of class that asked if the wavelength of an electron traveling at 5.3 x 10^6 m/s could be calculated. When we plugged in the numbers, we were given 9.11 x 10^-31 kg. Where does this number come from?
Thank you!!
On Friday we went over a problem at the end of class that asked if the wavelength of an electron traveling at 5.3 x 10^6 m/s could be calculated. When we plugged in the numbers, we were given 9.11 x 10^-31 kg. Where does this number come from?
Thank you!!
- Sun Oct 07, 2018 6:26 pm
- Forum: Limiting Reactant Calculations
- Topic: Determine Limiting Reagent
- Replies: 4
- Views: 3861
Re: Determine Limiting Reagent
Do you recommend comparing each reactant to the product? Or instead calculating both reactants in terms of moles and balancing them and then seeing which one is less?
I got the same answer both ways but I don't know which way is better.
Thank you!!
I got the same answer both ways but I don't know which way is better.
Thank you!!
- Sun Oct 07, 2018 6:15 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Review Question [ENDORSED]
- Replies: 3
- Views: 575
Re: Review Question [ENDORSED]
I keep getting 5.75 x 10^-4 instead of 10^-3...
What am I doing wrong?
What am I doing wrong?
- Sun Oct 07, 2018 4:19 pm
- Forum: Administrative Questions and Class Announcements
- Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
- Replies: 135
- Views: 39643
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
For balancing chemical equations do we need to show any work?