## Search found 62 matches

Sun Mar 17, 2019 9:15 pm
Forum: Balancing Redox Reactions
Topic: Triprotic
Replies: 7
Views: 57

### 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: 12

### 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: 21

### 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: 63

### 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: 18

### 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: 9

### 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: 13

### 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: 11

### 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: 18

### 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: 44

### 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: 27

### 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: 42

### 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: 52

### 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: 25

### 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: 47

### 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: 35

### 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: 28

### 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: 26

### 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: 51

### 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: 18

### 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: 31

### 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: 32

### 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: 111

### 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: 23

### 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: 67

### 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: 39

### 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: 22

### 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: 39

### 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.
Sat Dec 08, 2018 8:24 pm
Forum: DeBroglie Equation
Topic: test 2 question 3 part C (X-ray)
Replies: 1
Views: 50

### 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!!
Sat Dec 08, 2018 8:22 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: test 2 question 1 (nitrogen gas molecule)
Replies: 3
Views: 39

### 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!!
Sat Dec 08, 2018 8:15 pm
Forum: Photoelectric Effect
Topic: test 2 question 5 (neon lamp)
Replies: 1
Views: 41

### 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!!
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: 4004

### 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: 25

### salts in acids and bases

Can someone explain to me the effect that salts have on acids and bases respectively?

Thank you!!
Sat Dec 08, 2018 4:29 pm
Forum: Amphoteric Compounds
Topic: Amphoteric vs. Amphiprotic
Replies: 1
Views: 29

### Amphoteric vs. Amphiprotic

Can someone explain the difference between amphoteric and amphiprotic and give me an example of each?

Thank you!!
Thu Dec 06, 2018 9:59 pm
Forum: Properties of Light
Topic: Midterm Question 3B
Replies: 1
Views: 63

### 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!!
Sun Dec 02, 2018 6:14 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Ionization in Water
Replies: 1
Views: 64

### Ionization in Water

What is the relationship between strong and weak bases and getting partially or fully ionized in water?

Thank you!!
Sun Dec 02, 2018 6:13 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Amines
Replies: 1
Views: 71

### Amines

I know amines come from ammonia, but what are some examples of amines?

Thank you!!
Sun Dec 02, 2018 6:11 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Soapy Feels
Replies: 3
Views: 46

### Soapy Feels

Why do bases have a soapy feel?

Thank you!!
Sun Nov 25, 2018 10:31 pm
Forum: Hybridization
Topic: pi bonds and rotation
Replies: 3
Views: 34

### pi bonds and rotation

do pi bonds allow free rotation? if not, what happens to the bonds if there is rotation?

thank you!!
Sun Nov 25, 2018 10:30 pm
Forum: Hybridization
Topic: sigma vs. pi bonds
Replies: 4
Views: 29

### sigma vs. pi bonds

for single and double bonds, how many sigma and pi bonds are there respectively?

thank you!!
Sun Nov 25, 2018 10:27 pm
Forum: Hybridization
Topic: hybridization of BeCl2
Replies: 4
Views: 41

### hybridization of BeCl2

can someone explain to me the hybridization of BeCl2?

thank you!!
Sun Nov 18, 2018 9:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Octahedral to Square Planar
Replies: 7
Views: 59

### Octahedral to Square Planar

Can someone explain to me the transition from octahedral to square planar shape?
Thank you!!
Sun Nov 18, 2018 9:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Distorted Bond Angles
Replies: 3
Views: 39

### 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!!
Sun Nov 18, 2018 9:11 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Trigonal Bipyramidal
Replies: 3
Views: 54

### 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: 80

### Hydrogen Bonding

What is the typical attractive energy for hydrogen bonds?

Thank you!!
Sun Nov 11, 2018 3:52 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Interaction Potential Energy
Replies: 1
Views: 31

### Interaction Potential Energy

Why is interaction potential energy always negative?

Thank you!!
Sun Nov 11, 2018 3:50 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs on Neighboring Atoms
Replies: 2
Views: 30

### 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!!
Sun Nov 04, 2018 2:23 pm
Forum: Resonance Structures
Topic: Resonance Structures on the Midterm
Replies: 3
Views: 71

### 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: 20

### 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: 104

### 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: 93

### 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
Replies: 5
Views: 58

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
Replies: 4
Views: 40

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: 29

### KJ/mol-->J

Could someone explain how to convert from KJ/mol to J?

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: 126

### 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
Sun Oct 21, 2018 5:40 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Energy levels of orbitals?
Replies: 10
Views: 70

### 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!!
Sun Oct 14, 2018 5:10 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: E(n)=-hR/n^2
Replies: 3
Views: 52

### E(n)=-hR/n^2

In the equation E(n)=-hR/n^2, where does the negative come from?

Thank you!
Sun Oct 14, 2018 5:03 pm
Forum: Properties of Light
Topic: Visible Light Spectrum
Replies: 3
Views: 37

### 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: 28

### 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!!
Sun Oct 07, 2018 6:26 pm
Forum: Limiting Reactant Calculations
Topic: Determine Limiting Reagent
Replies: 4
Views: 940

### 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!!
Sun Oct 07, 2018 6:15 pm
Forum: Molarity, Solutions, Dilutions
Topic: Review Question [ENDORSED]
Replies: 3
Views: 184

### Re: Review Question[ENDORSED]

I keep getting 5.75 x 10^-4 instead of 10^-3...

What am I doing wrong?
Sun Oct 07, 2018 4:19 pm
Forum: Administrative Questions and Class Announcements