Search found 100 matches
- Sat Mar 14, 2020 6:58 pm
- Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
- Topic: Electrolysis
- Replies: 6
- Views: 483
Electrolysis
Would we need to know electrolysis for the final?
- Sat Mar 14, 2020 6:57 pm
- Forum: Van't Hoff Equation
- Topic: Van't Hoff Equation
- Replies: 6
- Views: 577
Re: Van't Hoff Equation
I think the main way we use this equation is to find the new equilibrium constant based on a change in temperature
- Sat Mar 14, 2020 6:53 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: negative sign
- Replies: 12
- Views: 691
Re: negative sign
I think it's to show that energy is release or loss
- Sat Mar 14, 2020 6:52 pm
- Forum: Van't Hoff Equation
- Topic: ln
- Replies: 34
- Views: 1936
Re: ln
You raise e by both sides of the equation
- Sat Mar 14, 2020 6:44 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: intensive vs extensive
- Replies: 12
- Views: 823
Re: intensive vs extensive
Extensive depends on the amount while intensive doesn't. It's important because it tells us which constant or which equation to use like specific heat capacity vs heat capacity, etc.
- Sat Mar 14, 2020 6:39 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: K
- Replies: 2
- Views: 261
Re: K
It symbolizes the equilibrium constant of the reaction
- Sat Mar 14, 2020 6:36 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Internal Energy
- Replies: 6
- Views: 587
Re: Internal Energy
Can anyone please explain to me why when it is an isothermal reversible expansion, we can assume that internal energy is 0 and q = -w? Thank you Isothermal means the temperature is constant and so the internal energy doesn't change so the change is 0. If change in internal energy is 0 then 0 = q + ...
- Sat Mar 14, 2020 6:32 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 547559
Re: Saying Thank You to Dr. Lavelle
THANK YOU SO MUCH DR. LAVELLE!!!!!!
- Sat Mar 14, 2020 6:31 pm
- Forum: Balancing Redox Reactions
- Topic: Pt in Cell Diagram
- Replies: 14
- Views: 937
Re: Pt in Cell Diagram
I think it is used when there's no solid that was explicitly said in the problem.
- Sat Mar 14, 2020 5:25 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Grading Scale
- Replies: 16
- Views: 1086
Re: Grading Scale
I think he curves up depending on the class average at the end of the quarter
- Sat Mar 14, 2020 5:19 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Test 2 Concentration Cell
- Replies: 3
- Views: 263
Re: Test 2 Concentration Cell
As well as doubling the mass of the cathode electrode will it increase or decrease the cell potential
- Sat Mar 14, 2020 5:17 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Test 2 Concentration Cell
- Replies: 3
- Views: 263
Re: Test 2 Concentration Cell
Also, if water is added in the cathode solution would the cell potential increase or decrease?
- Sat Mar 14, 2020 5:15 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Test 2 Concentration Cell
- Replies: 3
- Views: 263
Test 2 Concentration Cell
A concentration cell was constructed with two electrodes containing ZnSO4 (aq) at 25 degrees C. The cathode concentration is 3.0M and the cell potential 0.0866V/
Calculate the concentration of the anode solution
Is LnQ going to be the anode concentration over cathode or cathode over anode?
Calculate the concentration of the anode solution
Is LnQ going to be the anode concentration over cathode or cathode over anode?
- Sat Mar 14, 2020 3:28 pm
- Forum: Van't Hoff Equation
- Topic: Test 2 Calculate K after a temperature change
- Replies: 1
- Views: 288
Test 2 Calculate K after a temperature change
Given that delta H reaction = 161 kJ/mol and K = 8.43 x 10^-12 for the reaction at 25 degrees C. Calculate K at 125 degrees C. Assume that delta H reaction and delta S reaction remain constant over this temperature range.
Idk what I did because somehow I ended up with a new K value of 6.808 x 10^-96
Idk what I did because somehow I ended up with a new K value of 6.808 x 10^-96
- Sat Mar 14, 2020 3:10 pm
- Forum: Van't Hoff Equation
- Topic: what does it do?
- Replies: 13
- Views: 1009
Re: what does it do?
Van't Hoff Equation is used to calculate the new equilibrium constant based on temperature change
- Sat Mar 14, 2020 3:04 pm
- Forum: Balancing Redox Reactions
- Topic: Redox Reaction in a Basic Solution
- Replies: 3
- Views: 383
Redox Reaction in a Basic Solution
SeO4 2- (aq) + Au (s) = Au 3+ (aq) + SeO3 2- (aq)
I was confused with the reduction half-reaction
I thought it would be 2e- + SeO4 2- + H+ = SeO3 2- + OH-
Im assuming Im wrong since I put H+ was I supposed to put H2O instead?
I was confused with the reduction half-reaction
I thought it would be 2e- + SeO4 2- + H+ = SeO3 2- + OH-
Im assuming Im wrong since I put H+ was I supposed to put H2O instead?
- Sat Mar 14, 2020 2:48 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Nernst Equation
- Replies: 6
- Views: 515
Re: Nernst Equation
Also what R are we using?
- Sat Mar 14, 2020 2:47 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Nernst Equation
- Replies: 6
- Views: 515
Nernst Equation
Do we need to convert RT/nF * lnQ into 0.0592/n log Q?
Because I decided not to convert during one of the problems on the test as I forgot the conversion rate and I got the wrong answer even when I think my calculations were right. So is it necessary to use this conversion?
Because I decided not to convert during one of the problems on the test as I forgot the conversion rate and I got the wrong answer even when I think my calculations were right. So is it necessary to use this conversion?
- Sat Mar 14, 2020 2:40 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Calculating E cell at room temperature
- Replies: 1
- Views: 225
Calculating E cell at room temperature
2Ag+ (aq, 0.10M) + Cu (s) = 2Ag (s) + Cu 2+ (aq, 0.20M) Standard E cell is 0.460V
Can someone solve this pls.
Can someone solve this pls.
- Sat Mar 14, 2020 2:05 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Test 2 on Standard Cell Potential
- Replies: 6
- Views: 451
Re: Test 2 on Standard Cell Potential
Oops the Lithium half-reaction has standard E = -3.040V
- Sat Mar 14, 2020 9:04 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Test 2 on Standard Cell Potential
- Replies: 6
- Views: 451
Re: Test 2 on Standard Cell Potential
Also I need to find the standard Gibbs Free Energy, do I just use -nFE(standard)?
- Sat Mar 14, 2020 9:03 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Test 2 on Standard Cell Potential
- Replies: 6
- Views: 451
Test 2 on Standard Cell Potential
The half-reactions are
Ce 4+ (aq) + e- = Ce 3+ (aq) Standard E = 1.44V
Li+ (aq) + e- = Li (s)
How do I know which one is the cathode and which one is the anode for me to use standard E cell = standard E cathode - standard E anode????
Ce 4+ (aq) + e- = Ce 3+ (aq) Standard E = 1.44V
Li+ (aq) + e- = Li (s)
How do I know which one is the cathode and which one is the anode for me to use standard E cell = standard E cathode - standard E anode????
- Sat Mar 14, 2020 8:53 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram
- Replies: 11
- Views: 746
Cell Diagram
In a cell diagram, do we always use Platinum if nothing else is stated to be used?
- Sat Mar 14, 2020 8:50 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Concentration Cell
- Replies: 3
- Views: 258
Concentration Cell
So in a concentration cell, is the anode always the one with the lower concentration?
- Sat Mar 14, 2020 8:33 am
- Forum: Student Social/Study Group
- Topic: thoughtful poetry time + lavelle appreciation
- Replies: 6
- Views: 515
Re: thoughtful poetry time + lavelle appreciation
This is very beautiful. Thank you so much Lavelle for everything you've done and continue to do for your students :)
- Sat Mar 14, 2020 8:31 am
- Forum: Student Social/Study Group
- Topic: Curve?
- Replies: 50
- Views: 6331
Re: Curve?
I think it's either/or. If you end up with a C you pass or if you end up with 250 points you pass the class. Last quarter I had 444/500 points and ended with an A- so he does kind of curve but we won't know until they find the average points out of 500 of the class
- Sat Mar 14, 2020 8:28 am
- Forum: Student Social/Study Group
- Topic: Week 10 Review Question
- Replies: 5
- Views: 481
Re: Week 10 Review Question
Using the stoichiometric ratios and creating an ice table you should be able to calculate the molar concentrations
- Sat Mar 14, 2020 8:26 am
- Forum: Student Social/Study Group
- Topic: Coronavirus Joke
- Replies: 14
- Views: 1812
Re: Coronavirus Joke
Thank you for trying to lighten up the mood
- Sat Mar 14, 2020 8:26 am
- Forum: Student Social/Study Group
- Topic: Tips for Staying Focused
- Replies: 64
- Views: 3879
Re: Tips for Staying Focused
To stay focus I usually take a couple of breaths and try my best to only think about the task at hand and ignore my surroundings
- Fri Mar 13, 2020 1:49 am
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 12
- Views: 828
Re: Final
His latest update still didn't tell us how we are turning in the final
- Thu Mar 12, 2020 12:17 pm
- Forum: Ideal Gases
- Topic: Acids and Basis: Salts
- Replies: 9
- Views: 657
Re: Acids and Basis: Salts
Use an ice table and any available information like the pKa or pKb as well as any equilibrium constants would be needed to solve such a problem
- Thu Mar 12, 2020 12:13 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Take Home Final
- Replies: 16
- Views: 1033
Re: Take Home Final
I heard some people's take-home final is taken over a large window of time to accommodate for everyone but the tests are still designed to take the same amount of time. The only difference is to scan and upload our answers I guess. I hope we get an update soon
- Thu Mar 12, 2020 12:11 pm
- Forum: Student Social/Study Group
- Topic: Final Exam
- Replies: 22
- Views: 1588
Re: Final Exam
How are you guys going to be studying for the final I'm planning to look over the study guide Dr. Lavelle sent out, do the endgame worksheet Lyndon posted, and review my notes/ do practice hw problems. Also some UAs released another set of practice problems! https://lavelle.chem.ucla.edu/forum/view...
- Wed Mar 11, 2020 9:46 pm
- Forum: Student Social/Study Group
- Topic: Final Exam
- Replies: 22
- Views: 1588
Re: Final Exam
How are you guys going to be studying for the final
- Wed Mar 11, 2020 9:44 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 12
- Views: 828
Final
How will we turn in the final??
- Wed Mar 11, 2020 9:43 pm
- Forum: Administrative Questions and Class Announcements
- Topic: final
- Replies: 14
- Views: 976
Re: final
His latest email said that it'll be a take-home final now and he'll post the test on the website
- Wed Mar 11, 2020 9:39 pm
- Forum: Administrative Questions and Class Announcements
- Topic: ENDGAME Review Session
- Replies: 71
- Views: 5669
Re: ENDGAME Review Session
When are the answers going to be posted?
- Tue Mar 10, 2020 9:39 pm
- Forum: Administrative Questions and Class Announcements
- Topic: ENDGAME Review Session
- Replies: 71
- Views: 5669
Re: ENDGAME Review Session
Are we still going to have a review session on Friday?
- Tue Mar 10, 2020 12:37 pm
- Forum: Balancing Redox Reactions
- Topic: Half Reactions
- Replies: 15
- Views: 826
Half Reactions
Whenever we balance the half-reactions, how do we know whether we need to add an H+, OH-, and/or H2O on what side of the reduction or oxidation half-reaction?
- Tue Mar 10, 2020 12:31 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Concentration cell textbook question 6N. 3A self test [ENDORSED]
- Replies: 7
- Views: 106809
Re: Concentration cell textbook question 6N. 3A self test [ENDORSED]
So in a concentration cell, is the anode always the one with the lower concentration?
- Tue Mar 10, 2020 12:28 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: Boltzmann Equation
- Replies: 2
- Views: 314
Boltzmann Equation
I'm confused about the relationship between Boltzmann's constant and the gas constant.
- Mon Mar 09, 2020 10:37 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Reversible vs Irreversible
- Replies: 3
- Views: 280
Re: Reversible vs Irreversible
Then explain the graph of pressure vs volume of the reversible and irreversible expansion?
- Mon Mar 09, 2020 7:15 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Reversible vs Irreversible
- Replies: 3
- Views: 280
Reversible vs Irreversible
What is the difference between isothermal reversible expansion vs irreversible expansion?
- Mon Mar 09, 2020 7:13 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Calculating K
- Replies: 6
- Views: 424
Re: Calculating K
How does sig figs factor in calculating K then?
- Mon Mar 09, 2020 5:12 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: S = 0
- Replies: 21
- Views: 1184
Re: S = 0
The total change in entropy is 0 if the system is isothermal and reversible expansion. The entropy change of the surrounding is 0 if the system is isothermal and irreversible expansion.
- Mon Mar 09, 2020 5:04 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: ΔS of Phase Changes
- Replies: 5
- Views: 465
Re: ΔS of Phase Changes
We calculate the last step because the change of entropy is a state function and we only care about the initial and final state of the reaction. In this case, we want the entropy change of the water evaporating at 85 degrees so we need the water to heat up and change phase and then bring the temp of...
- Mon Mar 09, 2020 4:57 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Calculating concentrations at equilibrium
- Replies: 4
- Views: 427
Calculating concentrations at equilibrium
One mole of COBr2 was injected in a 1L flask at a certain temperature. The equilibrium mixture was then analyzed and found to contain 0.304 moles of CO.
Calculate the concentration of each species at equilibrium.
Calculate the concentration of each species at equilibrium.
- Mon Mar 09, 2020 11:35 am
- Forum: Ideal Gases
- Topic: Partial Pressure
- Replies: 13
- Views: 749
Partial Pressure
2NO + O2 = 2NO2
Why would decreasing the volume of a system increase the partial pressure of NO2?
Why would decreasing the volume of a system increase the partial pressure of NO2?
- Mon Mar 09, 2020 11:17 am
- Forum: Ideal Gases
- Topic: PV=nRT
- Replies: 74
- Views: 4549
Re: PV=nRT
Pressure times Volume = moles of gas times the gas constant times the temperature
- Mon Mar 09, 2020 11:15 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Calculating K
- Replies: 6
- Views: 424
Calculating K
When calculating K, why are there no units
- Sun Dec 08, 2019 10:33 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Nitro vs Nitrito
- Replies: 6
- Views: 516
Re: Nitro vs Nitrito
It would either underline N or O or it'll be written as NO2 or ONO (and the first element is the one that's bonded)
- Sun Dec 08, 2019 10:28 pm
- Forum: Naming
- Topic: NH4[PtCl3(NH3)]
- Replies: 6
- Views: 863
Re: NH4[PtCl3(NH3)]
It is platinate because the compound is an anion
- Sun Dec 08, 2019 10:26 pm
- Forum: Naming
- Topic: Polydentate
- Replies: 2
- Views: 206
Re: Polydentate
How can you tell a ligand is a polydentate? And what are examples of anionic ligands, how are they different from anions? A ligand is polydentate if it binds to the metal in two or more places, because it has two or more lone electron pairs. For example EDTA is a polydentate. They are different beca...
- Sun Dec 08, 2019 10:22 pm
- Forum: Naming
- Topic: [Fe(OH)(OH2)5]Cl2
- Replies: 3
- Views: 2587
Re: [Fe(OH)(OH2)5]Cl2
So the name for [Fe(OH)(OH2)5]Cl2 is pentaaquahydroxidoiron(III) chloride. But how did they get the charge on iron? And why is it chloride if there are two chloride, shouldn't it be dichloride? Since there is two chlorine it has a -2 charge so the coordination compound has an overall 2+ charge (Also...
Re: -ate
Only if the metal coordination compound is an anion
- Sun Dec 08, 2019 10:19 pm
- Forum: Naming
- Topic: Types of Compounds
- Replies: 2
- Views: 266
Re: Types of Compounds
Based on their electronegativity, i believe
- Sun Dec 08, 2019 10:18 pm
- Forum: Naming
- Topic: type of compound
- Replies: 3
- Views: 284
Re: type of compound
amphoteric metal oxide
- Sun Dec 08, 2019 10:17 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Stronger acid?
- Replies: 13
- Views: 1224
Re: Stronger acid?
Which would be the stronger acid HClO or HClO2? I know that you first look at bond length and then anion strength but how would you figure this one out?
HClO2 is stronger because of how there's more oxygen and a higher electron pulling ability, which delocalizes the electron
HClO2 is stronger because of how there's more oxygen and a higher electron pulling ability, which delocalizes the electron
- Sun Dec 08, 2019 10:15 pm
- Forum: Calculating the pH of Salt Solutions
- Topic: OH- and H+
- Replies: 6
- Views: 580
OH- and H+
How do you know if the solution will result in OH or H
- Sun Dec 08, 2019 10:14 pm
- Forum: Calculating the pH of Salt Solutions
- Topic: pH
- Replies: 6
- Views: 372
pH
How is the pH of a solution is related to its hydronium ion and hydroxide ion concentrations?
- Sun Dec 08, 2019 10:11 pm
- Forum: Air Pollution & Acid Rain
- Topic: Carbon dioxide
- Replies: 6
- Views: 735
Carbon dioxide
how can carbon dioxide lead to respiratory acidosis?
- Sun Dec 01, 2019 10:05 pm
- Forum: Naming
- Topic: Ligand Names
- Replies: 1
- Views: 128
Ligand Names
Do we need to know ligand names for the final
- Sun Dec 01, 2019 9:59 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Sigma Bond
- Replies: 10
- Views: 613
Re: Sigma Bond
Yep always
- Sun Dec 01, 2019 9:55 pm
- Forum: Naming
- Topic: Bis, Tris, Tetrakis, Pentakis
- Replies: 3
- Views: 458
Bis, Tris, Tetrakis, Pentakis
I am confused on how to use Bis, Tris, Tetrakis, Pentakis
Chelating
What is chelating?
- Sun Nov 24, 2019 8:48 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Hydrogen Bonding
- Replies: 13
- Views: 717
Re: Hydrogen Bonding
It happens with polar molecules with N, O, F, elements that have lone pairs that attract Hydrogen
Oxidation
What's an oxidation number
- Sun Nov 24, 2019 8:45 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligand
- Replies: 10
- Views: 537
Ligand
What is a ligand?
- Sun Nov 24, 2019 8:44 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: T-Shape
- Replies: 5
- Views: 435
T-Shape
So I was wondering why for T shape the two electron pairs are like right next to each other in the trigonal planar part of the trigonal bipyramidal
- Sun Nov 24, 2019 8:42 pm
- Forum: Hybridization
- Topic: H
- Replies: 3
- Views: 260
H
I missed the lecture can someone summarize what hybridization is
- Sun Nov 10, 2019 4:14 pm
- Forum: Dipole Moments
- Topic: What's a dipole
- Replies: 4
- Views: 284
What's a dipole
What's a dipole
- Sun Nov 10, 2019 4:02 pm
- Forum: Lewis Structures
- Topic: Electronegative
- Replies: 14
- Views: 850
Electronegative
So the more electronegative elements are more likely to get the electron?
- Sun Nov 10, 2019 3:41 pm
- Forum: Octet Exceptions
- Topic: Elements like Xenon
- Replies: 1
- Views: 127
Elements like Xenon
Elements like Xenon can have 12 electrons. Is 12 the max or what for elements with octet exceptions.
- Sun Nov 10, 2019 3:38 pm
- Forum: Lewis Structures
- Topic: Exceptions like Xenon
- Replies: 3
- Views: 230
Exceptions like Xenon
Are there other elements that can have 12 electrons like Xenon?
- Sun Nov 10, 2019 3:37 pm
- Forum: Lewis Structures
- Topic: Xenon
- Replies: 4
- Views: 776
Xenon
How come Xenon can have 12 electrons
- Sun Nov 03, 2019 10:08 pm
- Forum: Trends in The Periodic Table
- Topic: Electron Configuration Rules
- Replies: 4
- Views: 231
Re: Electron Configuration Rules
Hund's Rule states that each suborbital will be filled with electrons of parallel spins
Pauli's Exclusion Principle states that you can't have the same spin for paired electrons
Pauli's Exclusion Principle states that you can't have the same spin for paired electrons
- Sun Nov 03, 2019 9:56 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization
- Replies: 5
- Views: 653
Ionization
Why does oxygen have lower ionization energy compared to nitrogen
- Sun Nov 03, 2019 9:50 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization energy and Electron affinity
- Replies: 1
- Views: 168
Ionization energy and Electron affinity
I'm confused about the difference between the two
- Sun Nov 03, 2019 9:44 pm
- Forum: Dipole Moments
- Topic: Dipole
- Replies: 1
- Views: 126
Dipole
What's a dipole?
- Sun Nov 03, 2019 9:41 pm
- Forum: Octet Exceptions
- Topic: Uhhh
- Replies: 3
- Views: 161
Uhhh
What are the octet exceptions?
- Sun Oct 27, 2019 6:33 pm
- Forum: Electronegativity
- Topic: Electronegativity in Covalent Bonds
- Replies: 3
- Views: 105
Re: Electronegativity in Covalent Bonds
I believe it's only for covalent bonds
- Sun Oct 27, 2019 6:31 pm
- Forum: Ionic & Covalent Bonds
- Topic: Charges
- Replies: 4
- Views: 236
Charges
Wait I dont understand how a molecule like SO4 has a negative charge or NH4 with a positive charge
- Sun Oct 27, 2019 6:27 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Module Question
- Replies: 1
- Views: 104
Re: Module Question
Multiply 60W with 1s to convert it to Joules
Now use the speed of light equation and energy equation to get Energy = planks constant times speed of light over the wavelength. You will get the energy per photons
Then you divide the energy emitted with the energy per photon to get the number of photons
Now use the speed of light equation and energy equation to get Energy = planks constant times speed of light over the wavelength. You will get the energy per photons
Then you divide the energy emitted with the energy per photon to get the number of photons
- Sun Oct 27, 2019 6:07 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: 1.1
- Replies: 1
- Views: 79
1.1
1.1 Lines in the Balmer series of the hydrogen spectrum are observed at 656.3, 486.1, 434.0, and 410.2 nm. What is the wavelength of the next line in the series?
- Sun Oct 27, 2019 6:03 pm
- Forum: Resonance Structures
- Topic: Ideal Lewis Structure
- Replies: 4
- Views: 192
Re: Ideal Lewis Structure
You calculate by finding the formal charge, the more atoms with 0 formal charge the better. We also have to consider the electronegativity of the element
- Sun Oct 20, 2019 10:17 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Heisenberg In 1 Dimension
- Replies: 2
- Views: 125
Re: Heisenberg In 1 Dimension
I think it is safe to assume that it will be used in one dimension
- Sun Oct 20, 2019 10:09 pm
- Forum: Properties of Light
- Topic: 1F.19
- Replies: 5
- Views: 225
Re: 1F.19
s-block metals have lower ionization energies compared so they tend to form cations since they are more willing to give electrons away, so they are more reactive.
- Sun Oct 20, 2019 9:58 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: How to use it
- Replies: 5
- Views: 254
How to use it
When do we use this equation for?
- Sun Oct 20, 2019 9:54 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Magnetic Quantum Number
- Replies: 5
- Views: 247
Magnetic Quantum Number
I know how to get the third quantum number but like what does this number tell us about the electron?
- Sun Oct 20, 2019 9:49 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: The equation
- Replies: 2
- Views: 132
The equation
Where did the 4pi come from
- Sun Oct 13, 2019 11:27 pm
- Forum: Properties of Light
- Topic: Energy Equation
- Replies: 3
- Views: 169
Re: Energy Equation
Plancks Constant my guy
- Sun Oct 13, 2019 11:19 pm
- Forum: Properties of Light
- Topic: Rydberg's Equation
- Replies: 1
- Views: 153
Rydberg's Equation
When is Rydberg's equation used?
- Sun Oct 13, 2019 11:18 pm
- Forum: Properties of Light
- Topic: Photons
- Replies: 3
- Views: 170
Photons
Do photons have mass?
- Sun Oct 13, 2019 11:17 pm
- Forum: Properties of Electrons
- Topic: Electron standing wave
- Replies: 2
- Views: 188
Electron standing wave
What was the standing wave animation/picture that was shown in class
- Sun Oct 13, 2019 11:00 pm
- Forum: DeBroglie Equation
- Topic: DeBroglie's Equation
- Replies: 1
- Views: 115
DeBroglie's Equation
How come this wave equation can't be applies to light since light is massless but the equation was derived from the speed of light equation C= wavelength times frequency.
- Fri Oct 04, 2019 12:05 am
- Forum: SI Units, Unit Conversions
- Topic: Bond Length
- Replies: 5
- Views: 368
Bond Length
Whats the length of a bond?
- Fri Oct 04, 2019 12:01 am
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Determining Molar Mass
- Replies: 19
- Views: 673
Re: Determining Molar Mass
It should be fine
- Thu Oct 03, 2019 11:57 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: G 13
- Replies: 3
- Views: 373
G 13
To prepare a fertilizer solution, a florist dilutes 1L of 2M NH4NO3 by adding 3L of Water. The florist then adds 100mL of the diluted solution to each plant. How many moles of nitrogen atoms will each plant receive?
- Thu Oct 03, 2019 11:49 pm
- Forum: Balancing Chemical Reactions
- Topic: H11
- Replies: 3
- Views: 521
H11
Help balance equation pls
Fe2O3 + CO = Fe3O4 + CO2
and
Fe3O4 + CO = Fe + CO2
Fe2O3 + CO = Fe3O4 + CO2
and
Fe3O4 + CO = Fe + CO2
- Thu Oct 03, 2019 11:45 pm
- Forum: Limiting Reactant Calculations
- Topic: Limiting Reactant
- Replies: 2
- Views: 173
Limiting Reactant
Help cant solve
5g of KMnO4 is dissolved in 150mL. If 20mL of the solution is removed and placed in a 250mL what is the concentration?
5g of KMnO4 is dissolved in 150mL. If 20mL of the solution is removed and placed in a 250mL what is the concentration?