Search found 74 matches
- Sun Mar 17, 2019 4:03 pm
- Forum: Administrative Questions and Class Announcements
- Topic: LYNDON'S PORK RAMEN REVIEW
- Replies: 37
- Views: 7395
Re: LYNDON'S PORK RAMEN REVIEW
thank you so much Lyndon!
- Sun Mar 17, 2019 4:02 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K and Kc
- Replies: 6
- Views: 916
Re: K and Kc
Kc is the equilibrium constant with respect to the equilibrium concentrations. Kp is with respect to equilibrium partial pressures (for gases). K is one of these two.
- Sat Mar 16, 2019 10:53 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Arrhenius Equation
- Replies: 3
- Views: 544
Re: Arrhenius Equation
A is the frequency factor for the reaction. It is specific to each reaction.
- Sat Mar 16, 2019 10:52 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: adiabatic systems
- Replies: 10
- Views: 937
Re: adiabatic systems
adiabatic means no heat exchange (but there can he heat already stored in the system, there is just no heat loss or gain). in an adiabatic system, q=0
- Sat Mar 16, 2019 10:51 pm
- Forum: First Order Reactions
- Topic: pseudo first order [ENDORSED]
- Replies: 5
- Views: 913
Re: pseudo first order [ENDORSED]
Madison Hurst wrote:So is it technically a second order reaction, but because one of the concentrations is so big its basically constant?
it is pseudo first order with respect to the reactant you are focusing on, I think
- Sat Mar 16, 2019 10:50 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Orientation
- Replies: 2
- Views: 493
Re: Orientation
when reactant molecules collide to form products, the reactants must collide with enough energy and in the correct orientation to overcome the activation potential. We didn't go into much detail about orientation. Just know that the frequency factor (A) in the Arrhenius equation represents the perce...
- Sat Mar 16, 2019 10:46 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: ∆G and work
- Replies: 3
- Views: 870
Re: ∆G and work
deltaG for a spontaneous process represents the energy that is free to do useful work
- Sat Mar 16, 2019 10:43 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: q and delta H
- Replies: 6
- Views: 930
Re: q and delta H
the definition of enthalpy is the change in heat of a system at constant pressure. so q = deltaH at constant pressure.
- Sat Mar 16, 2019 10:42 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: elementary steps
- Replies: 3
- Views: 654
Re: elementary steps
rate laws can be written directly from the molecularity of each elementary step. this is because elementary steps directly show how molecules collide in each step of a proposed mechanism.
- Fri Mar 15, 2019 11:10 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: free expansion
- Replies: 2
- Views: 500
free expansion
why, in free expansion, are work and heat transfer both equal to zero?
- Fri Mar 15, 2019 10:48 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: U=0
- Replies: 6
- Views: 3165
U=0
is the change in internal energy always equal to zero for isothermal, reversible expansion?
- Thu Mar 14, 2019 6:09 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Picking up 14A final
- Replies: 1
- Views: 440
Picking up 14A final
can we still pick up our 14A final? and if so, where?
- Mon Mar 11, 2019 3:59 pm
- Forum: First Order Reactions
- Topic: 7B.9
- Replies: 3
- Views: 391
Re: 7B.9
This equation is used to find the concentration of A when 0.018 M of B has formed. Essentially, it is just balancing using the stoichiometric coefficients, and it is not an equation we explicitly learned. It makes sense because 3 moles of B forms from 1 mole of A, so it only took 1/3 of 0.018 M of [...
- Sat Mar 09, 2019 9:27 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: 7th edition 6.79
- Replies: 1
- Views: 236
7th edition 6.79
6.79 asks for the average current flowing through your body in the course of a day, given the Gibbs free energy and that all the energy we use comes from the reduction of O2 in the glucose oxidation reaction. Can someone explain how to do this problem?
- Sat Mar 09, 2019 8:55 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: 7th edition 6.57
- Replies: 1
- Views: 304
7th edition 6.57
6.57 asks for the Ka value for HF given the two half reaction reduction potentials. After calculating K using the Nernst equation, the solutions manual takes the square root of K to get the Ka value. Can someone explain why they do this?
Thanks!
Thanks!
- Sat Mar 09, 2019 11:22 am
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: 7th edition 6O.3
- Replies: 1
- Views: 249
7th edition 6O.3
In 6O.3, it asks to compare various aqueous ion solution to water at pH=7 to see which species will be reduced at the cathode. The answer key uses E=-0.42V for the reduction potential of water. However, in the appendix, the standard reduction potential of water is -0.83V. Can someone explain how the...
- Wed Mar 06, 2019 11:13 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: 7th edition 6N.1(b)
- Replies: 1
- Views: 252
7th edition 6N.1(b)
for part (b) of 6N.1, the answer key uses 2 for n, but both the anode and cathode half reactions only have one mol of electron transfer. Is this a solutions error or am I missing something?
- Tue Feb 26, 2019 10:49 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: H2O in cell diagrams
- Replies: 1
- Views: 200
H2O in cell diagrams
do you ever include H2O (l) in galvanic cell diagrams? and if so, when?
- Tue Feb 26, 2019 10:35 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6M5 part a
- Replies: 2
- Views: 438
Re: 6M5 part a
how do you know what liquids are conducting??
- Tue Feb 26, 2019 1:39 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6L5(b) 7th edition
- Replies: 2
- Views: 306
Re: 6L5(b) 7th edition
thank you!!
- Tue Feb 26, 2019 12:23 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6L5(b) 7th edition
- Replies: 2
- Views: 306
6L5(b) 7th edition
when writing the cell diagram, how do you know when to write Pt(s) on each electrode side??
- Sun Feb 24, 2019 11:37 pm
- Forum: Balancing Redox Reactions
- Topic: 6K3(d) 7th edition
- Replies: 1
- Views: 296
6K3(d) 7th edition
I'm working on part d of 6K3. It asks to balance the reaction of chlorine in water Cl2(g) --> HClO(aq) + Cl2(g) I got the oxidation half rxn as Cl2 + 2H20 --> HClO + 2H+ the final answer from the key is H20(l) + Cl2(g) --> HOCl(aq) + H+(aq) + Cl1(aq) I don't understand why the Cl2 in the reactants c...
- Tue Feb 12, 2019 11:42 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Lyndon's HOTDOG MIDTERM REVIEW SESSION!! FINALLY!
- Replies: 49
- Views: 11486
Re: Lyndon's HOTDOG MIDTERM REVIEW SESSION!! FINALLY!
can someone explain the reasoning behind the three steps to solve for enthalpy of #12B
- Mon Feb 11, 2019 9:48 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Equation for temperature change, 4F.11
- Replies: 4
- Views: 468
Re: Equation for temperature change, 4F.11
I just experienced the same thing. I don't understand why deltaS=nRln(T2/T1) is valid in this problem.
- Mon Feb 11, 2019 9:41 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: 7th edition 4F.11
- Replies: 3
- Views: 438
7th edition 4F.11
In this question, it asks you to calculate net change in entropy for a change in volume and temperature, but you aren't given the moles of gas. It tells you to assume ideal behavior (P=1.00atm), and the answer key also says to assume 1 mol of gas. Is this always true for gas at ideal behavior?
- Sat Feb 09, 2019 10:26 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: 4.19 7th edition
- Replies: 1
- Views: 255
4.19 7th edition
4.19 asks for the molar kinetic energy of Kr(g) at two temps 1.0C apart, in which the difference is the molar heat capacity of Kr(g).
The solutions manual gives the average kinetic energy = (3/2)RT. Did we cover this in class? Where does this equation come from?
The solutions manual gives the average kinetic energy = (3/2)RT. Did we cover this in class? Where does this equation come from?
- Sat Feb 09, 2019 9:56 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: 4.15 7th edition
- Replies: 1
- Views: 220
4.15 7th edition
In the final step pf 4.15 in the solutions manual is said
-2000J=(-4.184 J/Cg)(800g)(deltaT)
I understand they are using the q(water) = -q(zinc oxidation) = mCp(deltaT)
Where are they getting the 800g water from?
-2000J=(-4.184 J/Cg)(800g)(deltaT)
I understand they are using the q(water) = -q(zinc oxidation) = mCp(deltaT)
Where are they getting the 800g water from?
- Sat Feb 09, 2019 8:30 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: 7th edition 4E.5
- Replies: 3
- Views: 432
7th edition 4E.5
Hi all. I am currently working on 4E.5 in the 7th edition textbook. The question asks to estimate the reaction enthalpy using bond enthalpies for the formation of benzene: 3C2H2(g) --> C6H6(g) 3 C-C triple bonds are broken and 6 C-C 1.5 bonds are formed. Why isn't the formation of 6 C-H bonds includ...
- Thu Feb 07, 2019 1:15 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Midterm topics
- Replies: 3
- Views: 426
Midterm topics
Hi all. I was wondering up to what part of the syllabus we will be tested on for the midterm. I have the seventh edition and I know that Lavelle said the midterm will cover thermodynamics to the end of entropy. Is that through section 4I in the textbook?
Thanks.
Thanks.
- Thu Feb 07, 2019 12:07 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Problem 4A.9) 7th edition of the textbook [ENDORSED]
- Replies: 7
- Views: 37675
Re: Problem 4A.9) 7th edition of the textbook [ENDORSED]
responding to the question on heat lost by ice = - heat gained by water... The hear gained by the water is not negative. This relationship is simply implying that the heat lost by the ice and the heat gained by the water are equal and opposite one another. So you can use that relationship to find th...
- Thu Jan 24, 2019 8:13 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: converting between kp and kc
- Replies: 4
- Views: 440
Re: converting between kp and kc
The ideal gas law should be your go to:
PV=nRT
PV=nRT
- Wed Jan 23, 2019 9:40 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Writing equations for weak acids/bases
- Replies: 3
- Views: 581
Re: Writing equations for weak acids/bases
I would also caution to make sure your stoichiometric coefficients are correct when writing shorthand version of weak reactions.
- Wed Jan 23, 2019 9:02 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kp
- Replies: 3
- Views: 358
Re: Kp
I believe both will give you the correct answer, only as long as all of your partial pressures are in the same unit (either all bar or all atm).
- Fri Jan 18, 2019 9:56 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 5.61 7th Edition
- Replies: 1
- Views: 236
5.61 7th Edition
In problem 5.61 the photosynthesis reaction is given: 6CO2(g) + 6H2O(l) --> C6H12O6(aq) + 6O2(g) Part (b) asks what the effect would be if the system was compressed. Since there are more moles on the product side (disregarding moles of water on reactant side), I would think that compression would sh...
- Fri Jan 18, 2019 7:40 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 5I.27 in 7th edition
- Replies: 1
- Views: 171
5I.27 in 7th edition
Hi all,
I am currently working through 5I.27 and keep getting 8.7119 or 0.0738 for x, but the answer key has 9.2 or 0.071 for x. I have the quadratic equation set up the same as the answer key but can't find any mistakes in my calculations. Has anyone else run into this problem?
Thanks!
I am currently working through 5I.27 and keep getting 8.7119 or 0.0738 for x, but the answer key has 9.2 or 0.071 for x. I have the quadratic equation set up the same as the answer key but can't find any mistakes in my calculations. Has anyone else run into this problem?
Thanks!
- Sun Jan 13, 2019 10:15 pm
- Forum: Ideal Gases
- Topic: K value
- Replies: 8
- Views: 782
Re: K value
K=1 means that the concentration of the products is equal to the concentration of the reactants at equilibrium. It's not impossible, its just not common in everyday chemical reactions.
- Sun Jan 13, 2019 10:14 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Pure Solids and Liquids
- Replies: 4
- Views: 670
Re: Pure Solids and Liquids
My understanding is that because pure liquids remain extremely dilute and solids barely dissociate, their effects on equilibrium are disregarded. Therefore they are not included in the equilibrium constant.
- Sat Jan 12, 2019 10:09 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 5G.3 example from book
- Replies: 3
- Views: 2171
Re: 5G.3 example from book
My bad, I mean self test 5G.3A
- Sat Jan 12, 2019 10:07 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 5G.3 example from book
- Replies: 3
- Views: 2171
5G.3 example from book
In example 5G.3 in the 7th edition (page 401), it asks to find the equilibrium constant using the net ionic equation. Can someone help me understand how to do this? Or is this even relevant to what we have gone over in lecture?
Thanks!
Thanks!
- Sun Dec 09, 2018 2:55 pm
- Forum: Properties of Light
- Topic: Snail velocity final problem
- Replies: 3
- Views: 5435
Snail velocity final problem
When given the momentum of a gamma ray photon, how do you find the velocity of a 200g snail? How can photons have momentum when they are massless?
- Sun Dec 09, 2018 2:51 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: Strength
- Replies: 5
- Views: 895
Re: Strength
Yes, ion-ion is stronger because an ionic bonds is stronger than an ion-dipole intermolecular bond
- Sun Dec 09, 2018 10:22 am
- Forum: Administrative Questions and Class Announcements
- Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
- Replies: 118
- Views: 20869
Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
Once again, thank you so much Lyndon! You are a life saver!!
- Sun Dec 09, 2018 10:19 am
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: polarizability/polarizing power test 3
- Replies: 3
- Views: 674
Re: polarizability/polarizing power test 3
polarizability increases down a group and decreases across a period, because more electronegative atoms are harder to remove an electron from
polarizing power decreases down a group and increases across a period, because smaller, more highly charged cations have greater power
polarizing power decreases down a group and increases across a period, because smaller, more highly charged cations have greater power
- Sat Dec 08, 2018 6:22 pm
- Forum: Conjugate Acids & Bases
- Topic: Conjugates of Weak Acids/Bases
- Replies: 1
- Views: 497
Re: Conjugates of Weak Acids/Bases
Weak acids and bases will be discussed more thoroughly in 14B. For the 14A final, a conceptual understand that weak acids and bases do not completely ionize will probably suffice. Only calculations on strong acids and bases where they completely ionize will be on the final.
- Sat Dec 08, 2018 6:20 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: HOCl vs HOI
- Replies: 9
- Views: 4121
Re: HOCl vs HOI
HOCl is stronger because Cl is more electronegative, pulling the electrons close towards it. This weakens the O-H bond, making it easier to lose a proton(H+).
- Sat Dec 08, 2018 6:18 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: polydentate
- Replies: 2
- Views: 269
Re: polydentate
Transition metals can have expanded valence shells, so the ligands act as Lewis bases (donate electrons) to form coordinate covalent bonds. To find the coordination number, add up all the ligands attached to the central ion. Bidentate would attach at two places, so a bidentate ligand would count as ...
- Sat Dec 08, 2018 6:16 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: radical
- Replies: 5
- Views: 632
Re: radical
Radicals have an unpaired electron, making them very reactive.
- Sat Dec 08, 2018 6:15 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Oxyacids
- Replies: 4
- Views: 1037
Re: Oxyacids
This is because the greater the oxidation number of the central atom, the stronger the acid. When the oxidation number of the central atom is high, it has a greater electron withdrawing power (pulling electrons towards it), hence weakening the O-H bond (making it easier to lose the H/proton).
- Sat Dec 08, 2018 6:07 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: salts of weak acids and bases
- Replies: 4
- Views: 697
Re: salts of weak acids and bases
Since salts as acids and bases are weak, there probably won't be much on the final asking about them (Lavelle said that we will only be tested on strong acids and bases, weak will be covered more in 14B). Conceptually, I believe we should know that salts containing acids will lower the solution pH a...
- Fri Dec 07, 2018 11:48 pm
- Forum: Calculating the pH of Salt Solutions
- Topic: 6D.11
- Replies: 1
- Views: 461
6D.11
Hi all. In the 7th edition, question 6D.11 asks whether each salt has a pH greater than, less than, or equal to 7. Part (e) gives AlCl3. Why so small, highly charged cations react with water to form acidic solutions? The answer key says that the pH is less than 7 and gives the equation: AlH2O)6 3+(a...
- Thu Dec 06, 2018 12:04 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: 6B.9 7th Edition
- Replies: 1
- Views: 278
6B.9 7th Edition
This problem gives you a table of varying [H30+], [OH-], pH, and pOH values and you are asked to fill in the rest. The first line gives the [H30+] concentration as 1.50 mol/L. When plugging that into -log[H30+], I get -0.176, however, the answer key says that the pH is 0.176 (positive). Can someone ...
- Thu Dec 06, 2018 11:08 am
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Water
- Replies: 2
- Views: 373
Water
Does the pH of water increase or decrease with increasing temperature? Why?
- Thu Dec 06, 2018 11:02 am
- Forum: Amphoteric Compounds
- Topic: acidic vs. basic vs. amphoteric
- Replies: 2
- Views: 304
acidic vs. basic vs. amphoteric
Hi all!
I was wondering if anyone has any suggestions/easy ways of deciding if an oxide is acidic, basic, or amphoteric.
Thanks!
I was wondering if anyone has any suggestions/easy ways of deciding if an oxide is acidic, basic, or amphoteric.
Thanks!
- Sun Nov 25, 2018 12:50 pm
- Forum: Bond Lengths & Energies
- Topic: Bonds in Water
- Replies: 5
- Views: 581
Bonds in Water
Can someone please explain the difference between the covalent and hydrogen bonds in water? Thanks!
- Sun Nov 25, 2018 11:17 am
- Forum: Dipole Moments
- Topic: convention used
- Replies: 1
- Views: 233
convention used
In the book it says that in the original convention, the electric dipole is represented by an arrow that points towards the negative partial charge, but then continues to say that the book will use the modern convention, where the electric dipole is represented by an arrow that points to the positiv...
- Thu Nov 22, 2018 4:00 pm
- Forum: Octet Exceptions
- Topic: Expanded Octets
- Replies: 1
- Views: 443
Expanded Octets
In the textbook, it states that in PCl5, the P atom expands its valence shell to ten electrons by using one d-orbital. Wouldn't the lowest energy be if the P atom used two d-orbitals with the two electrons having the same spin (Hund's Rule)? Why do they only fill one orbital?
Thanks!
Thanks!
- Mon Nov 12, 2018 7:16 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizing Power
- Replies: 5
- Views: 491
Re: Polarizing Power
Polarizing power is the ability of a cation to distort an anion. Small cations have the greatest polarizing power because there is a greater concentration of positive charge in a smaller area, attracting the electrons from the anion.
- Thu Nov 08, 2018 7:04 pm
- Forum: Electronegativity
- Topic: Covalent Bonds
- Replies: 2
- Views: 255
Covalent Bonds
Hi all! I'm working on question 2D.7(a), where its asking if AlCl3 or KCl bonds are more covalent. The difference between the electronegativity of AlCl3 is 1.5 and the difference for KCl is 2.2. Since covalent bonds are identified as having a EN difference of <1.5, shouldn't the AlCl3 be considered ...
- Sat Nov 03, 2018 10:29 pm
- Forum: Administrative Questions and Class Announcements
- Topic: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
- Replies: 121
- Views: 17231
Re: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
Thank you so much for all your help today Lyndon!! You are incredibly generous with your time! Good luck on your midterms and get well soon!!
- Thu Nov 01, 2018 10:50 pm
- Forum: Ionic & Covalent Bonds
- Topic: Copper Ions
- Replies: 3
- Views: 342
Copper Ions
What is the difference between copper(I) ion and copper(II) ion?
- Wed Oct 31, 2018 1:42 pm
- Forum: Octet Exceptions
- Topic: Phosphorus Pentachloride example from class
- Replies: 1
- Views: 354
Phosphorus Pentachloride example from class
Hi all! In lecture this morning, Dr. Lavelle presented the example of phosphorus pentachloride for expanded valence shells. He wrote that the molecule's ten valence electrons' configuration is s2p6d2, using one d-orbital. Wouldn't the two electrons in the d-orbital occupy two separate orbitals, inst...
- Mon Oct 29, 2018 8:22 am
- Forum: Electronegativity
- Topic: Periodic Trends
- Replies: 8
- Views: 771
Re: Periodic Trends
Electronegativity increases to the right, but this trend does not include the noble gases. So Fluorine has the highest electronegativity, not Ne or He. This makes sense because electronegativity refers to an element's ability to form covalent bonds, and noble gases don't bond.
- Fri Oct 26, 2018 12:25 am
- Forum: DeBroglie Equation
- Topic: momentum of light
- Replies: 2
- Views: 306
momentum of light
In regards to the DeBroglie equation, can light have momentum even though photons are massless?
Thanks!
Thanks!
- Thu Oct 25, 2018 9:30 pm
- Forum: Einstein Equation
- Topic: Calculating number of photons emitted
- Replies: 3
- Views: 2165
Calculating number of photons emitted
Using the Einstein equation, how do you calculate the number of photons emitted from a light source??
Thanks!
Thanks!
- Sat Oct 20, 2018 1:12 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Orbitals
- Replies: 4
- Views: 523
Re: Orbitals
My TA told us that we will be tested on the following concepts:
wave/particle duality
photoelectric effect
De Brogile's equation
Heisenberg's indeterminacy equation
electromagnetic spectrum
He also said that his test is problem-solving heavy! I do not believe that orbitals will be on this test.
wave/particle duality
photoelectric effect
De Brogile's equation
Heisenberg's indeterminacy equation
electromagnetic spectrum
He also said that his test is problem-solving heavy! I do not believe that orbitals will be on this test.
- Sat Oct 20, 2018 1:09 pm
- Forum: Photoelectric Effect
- Topic: Significance of the photoelectric effect
- Replies: 3
- Views: 11260
Re: Significance of the photoelectric effect
The photoelectric effect is significant because it showed that light has both wave-like properties and particle-like properties. The finding was that increasing the intensity of the light would not result in electrons being emitted from the metal surface. Instead, you have to increase the frequency/...
- Sat Oct 20, 2018 12:58 pm
- Forum: Properties of Light
- Topic: Atomic Spectra pre-module quiz
- Replies: 1
- Views: 224
Atomic Spectra pre-module quiz
Hi all!
I'm looking for some basic clarification on the atomic spectra... what is the difference between atomic absorption and atomic emission spectroscopy and what does each line/wavelength on the spectrum represent?
Thanks!
I'm looking for some basic clarification on the atomic spectra... what is the difference between atomic absorption and atomic emission spectroscopy and what does each line/wavelength on the spectrum represent?
Thanks!
- Sat Oct 20, 2018 12:55 pm
- Forum: Properties of Light
- Topic: Atomic Spectra
- Replies: 1
- Views: 122
Atomic Spectra
Hi all!
Has anyone completed problem 1A.15? How do find the initial and final values of n when given the line observed at 102.6 nm?
Thanks!
Has anyone completed problem 1A.15? How do find the initial and final values of n when given the line observed at 102.6 nm?
Thanks!
- Sun Oct 14, 2018 11:54 pm
- Forum: Photoelectric Effect
- Topic: Threshold Energy
- Replies: 2
- Views: 189
Threshold Energy
Hi all!
Each unique metal surface has its own threshold energy needed to remove an electron... if this threshold isn't met, is the energy of the incoming photon absorbed by the surface? I'm just curious to know where this energy goes (thinking about the conservation of energy).
Thanks!
Each unique metal surface has its own threshold energy needed to remove an electron... if this threshold isn't met, is the energy of the incoming photon absorbed by the surface? I'm just curious to know where this energy goes (thinking about the conservation of energy).
Thanks!
- Sun Oct 14, 2018 11:49 pm
- Forum: Limiting Reactant Calculations
- Topic: Limting Reactant Calculations
- Replies: 1
- Views: 680
Limting Reactant Calculations
Hi all!
In the post-module assessment for the limiting reactant calculations module, there were two questions that asked you to find the product formed under the criteria of 1 atm and 25 degrees Celsius. Do these change the way we calculate product or can they be disregarded?
Thank you!
In the post-module assessment for the limiting reactant calculations module, there were two questions that asked you to find the product formed under the criteria of 1 atm and 25 degrees Celsius. Do these change the way we calculate product or can they be disregarded?
Thank you!
- Sun Oct 14, 2018 11:40 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student [ENDORSED]
- Replies: 297
- Views: 383133
Re: Advice from a Medical Student [ENDORSED]
Thank you so much! It's always encouraging to hear that our hard work will be applicable for many years to come!
- Sun Oct 07, 2018 12:36 am
- Forum: Significant Figures
- Topic: Chemical Structure
- Replies: 2
- Views: 168
Chemical Structure
Hi all!
Wondering if I should be reviewing chemical structure properties for the upcoming test... do you think there will be questions where we will need to know basic shapes, polarity, and bond type??
Thank you!
Wondering if I should be reviewing chemical structure properties for the upcoming test... do you think there will be questions where we will need to know basic shapes, polarity, and bond type??
Thank you!
- Sun Oct 07, 2018 12:31 am
- Forum: Molarity, Solutions, Dilutions
- Topic: dilutions? [ENDORSED]
- Replies: 5
- Views: 618
Re: dilutions? [ENDORSED]
m1v1=m2v2 will be your best friend! Also, here is Lavelle's video module on molarity and dilution of a solution!
https://lavelle.chem.ucla.edu/wp-conten ... n.wmv.html
https://lavelle.chem.ucla.edu/wp-conten ... n.wmv.html
- Sun Oct 07, 2018 12:28 am
- Forum: General Science Questions
- Topic: Rusty on High School Chem [ENDORSED]
- Replies: 347
- Views: 416677
Re: Rusty on High School Chem [ENDORSED]
Does anyone have any recommendations for a review video on how to read the periodic table and what the columns/rows mean??
Thanks!!
Thanks!!