Search found 104 matches
- Sat Mar 14, 2020 6:41 pm
- Forum: Van't Hoff Equation
- Topic: ln
- Replies: 34
- Views: 1782
Re: ln
it is e to the power of the other side
- Sat Mar 14, 2020 6:34 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram
- Replies: 11
- Views: 713
Re: Cell Diagram
Venus_Hagan 2L wrote:Yes, platinum should be used when you do not have a solid in the half-reaction. It is a non-conductive metal, so it is usually the best choice
non-reactive*
- Sat Mar 14, 2020 6:33 pm
- Forum: Balancing Redox Reactions
- Topic: Pt in Cell Diagram
- Replies: 14
- Views: 872
Re: Pt in Cell Diagram
if the reactants and products of the half-reaction are not in solid form, you need some type of solid metal as the electrode. Usually, you use Pt(s) because it is a fairly non-reactive metal.
- Sat Mar 14, 2020 6:31 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Internal Energy
- Replies: 6
- Views: 564
Re: Internal Energy
If the temperature is constant, there is no heat change and thus the change in internal energy is zero
- Sat Mar 14, 2020 6:28 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 513222
Re: Saying Thank You to Dr. Lavelle
Dr. Lavelle,
Thank you for all that you have done for us these past two semesters. I am glad to have had for 14A and 14B. All of the resources and extra effort you put in really made a difference. I appreciate all that you have done for us as a class. Hope you have a great spring quarter :).
Thank you for all that you have done for us these past two semesters. I am glad to have had for 14A and 14B. All of the resources and extra effort you put in really made a difference. I appreciate all that you have done for us as a class. Hope you have a great spring quarter :).
- Sat Mar 14, 2020 6:24 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Endothermic vs Exothermic
- Replies: 2
- Views: 297
Re: Endothermic vs Exothermic
You can tell if the reaction is favored based on its delta G. Exothermic and endothermic correlate to the delta H value
- Sat Mar 14, 2020 6:17 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem Community Posts Due Date
- Replies: 13
- Views: 1079
Re: Chem Community Posts Due Date
i would just finish them tonight just in case.
- Sat Mar 14, 2020 3:16 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalysts on Final
- Replies: 7
- Views: 524
Re: Catalysts on Final
if there is a question with a catalyst, I think it would be to identify what species is the catalyst in a reaction mechanism
- Sat Mar 14, 2020 3:12 pm
- Forum: Balancing Redox Reactions
- Topic: Redox Reaction in a Basic Solution
- Replies: 3
- Views: 372
Re: Redox Reaction in a Basic Solution
In a basic solution, there will be no H+ ions. You can only add either water or OH-.
- Sat Mar 14, 2020 3:11 pm
- Forum: Zero Order Reactions
- Topic: 0 order
- Replies: 6
- Views: 468
Re: 0 order
the concentration of the reactants have no effect on the rate of reactants
- Sat Mar 14, 2020 3:07 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram
- Replies: 11
- Views: 713
Re: Cell Diagram
Yes, platinum should be used when you do not have a solid in the half-reaction. It is a non-conductive metal, so it is usually the best choice
- Fri Mar 13, 2020 2:01 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Electrodes
- Replies: 4
- Views: 372
Re: Electrodes
if you do not have a solid in your half-reactions, you need to add a non-conductive metal such as Pt(s). I think you can add others but Pt is the typical one
- Fri Mar 13, 2020 1:47 pm
- Forum: *Identifying Primary, Secondary, Tertiary, Quaternary Carbons, Hydrogens, Nitrogens
- Topic: Will the Final for 14B have Identification?
- Replies: 9
- Views: 5834
Re: Will the Final for 14B have Identification?
I don't think so because he didn't talk about it in lecture
- Fri Mar 13, 2020 1:47 pm
- Forum: *Identifying Primary, Secondary, Tertiary, Quaternary Carbons, Hydrogens, Nitrogens
- Topic: Will the Final for 14B have Identification?
- Replies: 9
- Views: 5834
Re: Will the Final for 14B have Identification?
I don't think so because he didn't talk about it in lecture
- Tue Mar 10, 2020 11:51 pm
- Forum: Student Social/Study Group
- Topic: Lyndon Review
- Replies: 6
- Views: 660
Re: Lyndon Review
Jamie Hwang 2F wrote:is it even still happening? Because someone said that the UA step up sessions will probably be cancelled as they are going home
I believe it is canceled. His email said all of the review sessions and office hours have been canceled.
- Tue Mar 10, 2020 11:00 pm
- Forum: Balancing Redox Reactions
- Topic: Test 2 Return
- Replies: 20
- Views: 1145
Re: Test 2 Return
I know the grades have been posted, but im not sure if we are going to get the actual test back
- Tue Mar 10, 2020 10:58 pm
- Forum: Administrative Questions and Class Announcements
- Topic: review sessions and office hours
- Replies: 6
- Views: 515
Re: review sessions and office hours
I would like to know this as well(especially the one with Lyndon)
- Tue Mar 10, 2020 10:56 pm
- Forum: Ideal Gases
- Topic: Acids and Basis: Salts
- Replies: 9
- Views: 611
Re: Acids and Basis: Salts
most of the time when you are dealing with weak acids and bases, you will be using an ICE table
- Mon Mar 09, 2020 5:29 pm
- Forum: Student Social/Study Group
- Topic: Final
- Replies: 21
- Views: 1362
Re: Final
I am pretty sure the final will not be online because at the 1:00 lecture Lavelle showed us the link on his website that tells us where to go to take the test.
- Mon Mar 02, 2020 4:21 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Standard Hydrogen Electrode
- Replies: 2
- Views: 229
Re: Standard Hydrogen Electrode
Yes. The Standard Hydrogen Electrode is used to measure the standard potential of other electrodes
- Mon Mar 02, 2020 4:19 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Platinum
- Replies: 2
- Views: 200
Re: Platinum
We use metals like platinum in our galvanic cells when both the reactants and products of a half-reaction are not in a solid-state. For the example of a hydrogen cathode, the H+ ions(aq) are getting reduced into H2 gas. Without a platinum electrode, the electrons can not flow from the anode and get ...
- Mon Mar 02, 2020 4:12 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test Two
- Replies: 5
- Views: 349
Re: Test Two
I don't think there are any specific review sessions for test 2
- Tue Feb 18, 2020 9:18 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing half reactions
- Replies: 11
- Views: 656
Re: Balancing half reactions
Yes, the number of electrons lost in one reaction should equal the number of electrons gained in the other.
- Tue Feb 18, 2020 9:16 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Standard Gibbs Free Energy Conditions
- Replies: 4
- Views: 348
Re: Standard Gibbs Free Energy Conditions
for standard free energy, the temperature is 298 K or 25 degrees C
- Tue Feb 18, 2020 9:12 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: converting T to kelvin
- Replies: 46
- Views: 3279
Re: converting T to kelvin
If you are considering delta T then it is okay to leave in Celcius because both units have the same scale, but if you are just considering temperature then you should convert to kelvins by adding 273.15
- Mon Feb 17, 2020 9:52 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Midterm Curve
- Replies: 45
- Views: 2126
Re: Midterm Curve
I don't believe he will curve the midterm itself. :(
- Mon Feb 10, 2020 12:16 am
- 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: Positional/Residual Entropy
- Replies: 3
- Views: 194
Re: Positional/Residual Entropy
If a molecule consists of all the same atoms or the atoms can be in multiple places within the molecule (resonance) then it has no positional entropy and at 0 Kelvins, the molecule would have no entropy. Ex BF3. If the molecule has different molecules like COF2, then the oxygen can be in multiple pl...
- Mon Feb 10, 2020 12:10 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Cv
- Replies: 3
- Views: 194
Re: Cv
Cv is at constant volume and Cp is at constant pressure
- Mon Feb 10, 2020 12:08 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: % dissociation
- Replies: 5
- Views: 345
Re: % dissociation
percent dissociation is how much of the acid separated into its conjugate base and a proton compared to the original amount of acid or how much of the base separated into its conjugate acid and OH- compared to the original amount of base. You can calculate it by putting either the concentration of ...
- Mon Feb 10, 2020 12:07 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: % dissociation
- Replies: 5
- Views: 345
Re: % dissociation
percent dissociation is how much of the acid separated into its conjugate base and a proton compared to the original amount of acid or how much of the base separated into its conjugate acid and OH- compared to the original amount of base. You can calculate it by putting either the concentration of t...
- Mon Feb 10, 2020 12:02 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Kelvin or Celsius?
- Replies: 86
- Views: 5166
Re: Kelvin or Celsius?
for the ideal gas equation use Kelvin but if you ever need the change in temperature it doesn't matter because both are scaled the same way
- Sun Feb 02, 2020 11:40 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: closed vs isolated?
- Replies: 7
- Views: 1246
Re: closed vs isolated?
a closed system is when matter can not exchange with the surroundings but energy can, an isolated system is when energy and matter both can not exchange with the surroundings
- Sun Feb 02, 2020 11:36 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Delta H and U
- Replies: 3
- Views: 99
Re: Delta H and U
Delta H is the heat of the system at constant pressure, but delta U is heat AND work
- Sun Feb 02, 2020 11:29 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: delta U
- Replies: 9
- Views: 375
Re: delta U
ΔU=q+w
- Sun Feb 02, 2020 11:27 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: R constants
- Replies: 40
- Views: 2110
Re: R constants
The value of R changes based on the units. All of them are given on the equation sheet, so just look to see what units the problem has given you and choose the appropriate one
- Sun Feb 02, 2020 11:26 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Heat capacity vs. specific heat capacity
- Replies: 3
- Views: 359
Re: Heat capacity vs. specific heat capacity
heat capacity is the most general term focusing on how much heat is required to raise a substance by 1 degree C/K. Specific heat capacity takes into account mass and is how much heat is required to raise 1 gram of the substance by 1 degree C/K.
- Sun Jan 26, 2020 11:46 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Week 4 Homework
- Replies: 11
- Views: 291
Re: Week 4 Homework
005162520 wrote:So are we on thermodynamics?
yes we are on thermodynamics/thermochemistry
- Sun Jan 26, 2020 11:44 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Shift Change Rules
- Replies: 5
- Views: 291
Re: Shift Change Rules
Add products or remove reactants → toward reactants Add reactants or remove products → toward products if you inc pressure, then shifts toward fewer gas particles if you dec pressure, then shift toward more gas particles For exothermic reactions: inc temp → toward reactants dec temp → toward product...
- Sun Jan 26, 2020 11:34 pm
- Forum: Phase Changes & Related Calculations
- Topic: Chem 14A Final Pickup
- Replies: 8
- Views: 340
Re: Chem 14A Final Pickup
I have not yet, but I think we are still able to pick up our test this week
- Sun Jan 26, 2020 11:13 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: calculating % ionization
- Replies: 4
- Views: 250
Re: calculating % ionization
You take the ion concentration that the acid or base produces( so if HA is the acid, the ion will be A-) and divide it by the initial concentration of acid or base.
- Sun Jan 26, 2020 11:11 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: State Functions
- Replies: 4
- Views: 248
Re: State Functions
Heat and work are not state functions. The path/steps that are taken to get the value matter.
- Thu Jan 23, 2020 8:51 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Value of Ka, Kw, Kb
- Replies: 5
- Views: 141
Re: Value of Ka, Kw, Kb
Kw always is 10^-14 at 25 degrees, but Kb and Ka will change based on the reaction.
- Tue Jan 21, 2020 7:58 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test One Content
- Replies: 6
- Views: 288
Re: Test One Content
Megan Kirschner wrote:Is the only requirement for the calculator that it cannot be graphing?
i believe you can use a scientific calculator or one of the simple four-function ones
- Tue Jan 21, 2020 7:48 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: partial pressure
- Replies: 5
- Views: 255
Re: partial pressure
i think they both work. it just depends on what you are given for that problem. My TA also mentioned that the difference between the two is very small so we can almost consider them the same thing (no need to convert between the two)
- Tue Jan 21, 2020 7:46 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Grading of Tests
- Replies: 18
- Views: 684
Re: Grading of Tests
most of the time in 14A we got partial credit. Depends on the TA because they are grading
- Tue Jan 21, 2020 6:32 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Grading
- Replies: 8
- Views: 560
Re: Grading
I don't think the TAs have any control over the chemistry community. I think Lavelle has a system of checking but its not like you need them done before your discussion. Its just by the end of the week so sunday night.
- Mon Jan 20, 2020 4:14 pm
- Forum: Student Social/Study Group
- Topic: Test 1
- Replies: 9
- Views: 546
Re: Test 1
the professor usually doesn't post a practice test
- Sun Jan 12, 2020 11:56 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K and Q
- Replies: 6
- Views: 317
Re: K and Q
yes they are both solved using the same formula ([products]/[reactants]) but Q is using the concentrations when the reaction is not at equilibrium and K is when it is at equilibrium
- Sun Jan 12, 2020 11:34 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K's
- Replies: 3
- Views: 125
Re: K's
Kc is the equilibrium constant using concentrations and Kp is the equilibrium constant using partial pressures.
- Sun Jan 12, 2020 11:33 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K Expression for Reverse Reaction
- Replies: 3
- Views: 136
Re: K Expression for Reverse Reaction
The expression would be flipped because the products always go on the top and the reactants on the bottom. In a reverse reaction, the products become the reactants and their concentration(s) goes on the bottom now. Similarly, the reactants become the products and their concentration(s) will go on th...
- Sun Jan 12, 2020 11:24 pm
- Forum: Ideal Gases
- Topic: Aqueous Solutions
- Replies: 4
- Views: 132
Re: Aqueous Solutions
i believe aqueous solutions are included only pure liquids like H20 are excluded.
- Thu Jan 09, 2020 7:45 pm
- Forum: Administrative Questions and Class Announcements
- Topic: homework question
- Replies: 5
- Views: 288
Re: homework question
it can be any five questions that fall under the chemical equilibrium section on the syllabus
Re: cobalt
if the complex (so the central atom and its ligands) has an overall negative charge then you add the ending -ate.
- Sat Dec 07, 2019 10:24 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: -ido vs -o
- Replies: 5
- Views: 592
Re: -ido vs -o
The two different names are because there are two different sets of naming rules. The book uses one and Lavelle used another in class. I think either is fine.
- Sat Dec 07, 2019 10:21 pm
- Forum: Hybridization
- Topic: Hybridization
- Replies: 1
- Views: 234
Re: Hybridization
I think so. If you have 2 regions of electron density it will always be sp, 3 regions is sp2, 4 regions is sp3, 5 regions is sp3d, and 6 regions is sp3d2.
- Sat Dec 07, 2019 3:15 pm
- Forum: Naming
- Topic: Transition Metal Latin Names
- Replies: 3
- Views: 907
Re: Transition Metal Latin Names
I believe it is just iron and copper. They would be ferrate/ferrous and cuprous/cuprate.
- Sat Dec 07, 2019 3:09 pm
- Forum: Conjugate Acids & Bases
- Topic: Strength
- Replies: 2
- Views: 229
Re: Strength
Stong acids have a weak conjugate base and strong bases have a weak conjugate acid,
- Sat Dec 07, 2019 3:07 pm
- Forum: Bronsted Acids & Bases
- Topic: Main Difference
- Replies: 8
- Views: 585
Re: Main Difference
Bronstead acids and bases focus on what is happening with the protons. What is giving up and H+ and what is gaining an H+? Lewis acids and bases focus on the electron. What is giving up an electron and what is gaining an electron ?
- Sat Dec 07, 2019 1:38 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligand Charges
- Replies: 3
- Views: 154
Re: Ligand Charges
i honestly just memorized them. In the textbook, table 9C.1 is a list of the common ligands with their names, formulas, and charges
- Sat Dec 07, 2019 1:30 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Equations
- Replies: 5
- Views: 143
Re: Equations
the equation sheets from the last test didn't have the formula for Ka but pH was on there
Re: cobaltate
It will be cobaltate because the complex overall has a negative charge. The F6 gives it a -6 charge and the K3 is a plus 3 charge. That means for the entire coordination compound to be neutral then cobalt is a +3. Despite the cobalt itself having a positive charge, the complex or what's in brackets ...
- Thu Dec 05, 2019 9:54 pm
- Forum: Biological Examples
- Topic: Coordination Number vs Oxidation State
- Replies: 2
- Views: 189
Re: Coordination Number vs Oxidation State
The coordination number is basically how many ligands are attached to the central atoms while the oxidation number is the charge of the transition metal.
- Thu Dec 05, 2019 9:50 pm
- Forum: Naming
- Topic: Cyanido vs cyano
- Replies: 5
- Views: 312
Re: Cyanido vs cyano
i think technically both are right. I would stick with cyano because that's what Professor Lavelle used in class
- Sun Dec 01, 2019 10:44 pm
- Forum: Naming
- Topic: Brackets in Chem. Formula
- Replies: 5
- Views: 322
Re: Brackets in Chem. Formula
The transition metal and all its ligand will be inside the brackets and then everything else is outside. If you are going from a name to the formula everything in the complex will be one word and then things outside will be another word.
- Sun Dec 01, 2019 10:40 pm
- Forum: Lewis Acids & Bases
- Topic: Weak vs. Strong
- Replies: 8
- Views: 694
Re: Weak vs. Strong
Basically strong acids dissociate completely and become ions while for weak acids some of it will dissociate and some will remain as acid.
- Sun Dec 01, 2019 10:35 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Equilibrium constants
- Replies: 3
- Views: 136
Re: Equilibrium constants
the formula for kA = [A-][H+] / [AH]. i dont think we need to solve for it in this class but its good to know what it is and what it means
- Sun Dec 01, 2019 10:29 pm
- Forum: Naming
- Topic: How to name iron in a TM complex?
- Replies: 1
- Views: 101
Re: How to name iron in a TM complex?
you have to use the latin versions so it would be ferrous or ferrate
- Sun Dec 01, 2019 10:06 pm
- Forum: Lewis Acids & Bases
- Topic: Strong versus weak
- Replies: 5
- Views: 366
Re: Strong versus weak
strong acids fully dissociate and become ions in water. weak acids dont dissociate completely and some of acid still remains.
- Sat Nov 30, 2019 11:19 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: salt and water formation
- Replies: 5
- Views: 320
Re: salt and water formation
In lecture, Lavelle said that Lewis acid and bases always produce salt but not always water. Bronstead acids and bases always produce water and salt.
- Mon Nov 25, 2019 11:52 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination Number
- Replies: 3
- Views: 261
Re: Coordination Number
the coordination number is pretty much how many ligand are attached to the central atom
- Mon Nov 25, 2019 11:49 pm
- Forum: Naming
- Topic: -ate ending
- Replies: 8
- Views: 564
Re: -ate ending
if the complex has an overall negative charge you would add -ate to the end of the metal's name
- Mon Nov 25, 2019 11:48 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Transition Metals
- Replies: 4
- Views: 341
Re: Transition Metals
i think we will only see coordination compounds with transition metals
- Mon Nov 25, 2019 11:43 pm
- Forum: Lewis Acids & Bases
- Topic: When is an acid considered Bronsted?
- Replies: 9
- Views: 554
Re: When is an acid considered Bronsted?
Maya Pakulski 3D wrote:Why are there there two definitions for acids and bases? Why not just one?
the two definitions focus on different things. Bronstead focuses on the transfer of protons or H+ ions and Lewis focuses on electrons
- Tue Nov 19, 2019 6:24 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: induced dipole-induced dipole
- Replies: 4
- Views: 252
Re: induced dipole-induced dipole
They pretty much happen in all molecules all of the time because the electrons are always moving and can pile up on one side temporarily at any time.
- Sun Nov 17, 2019 11:39 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Drawing molecules
- Replies: 12
- Views: 658
Re: Drawing molecules
We do not need to know how to draw the 3D models with the bold and dashed lines. We just need to draw Lewis structures and know the shapes.
- Sun Nov 17, 2019 11:37 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bonds in VSEPR
- Replies: 11
- Views: 585
Re: Bonds in VSEPR
We don't care about whether it is a single or double or triple bond. We consider them all a single region of electron density.
- Sun Nov 17, 2019 11:32 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Resonance and VSEPR
- Replies: 9
- Views: 535
Re: Resonance and VSEPR
I don't think so because double and triple bonds are still considered one region of electron density.
- Sun Nov 17, 2019 11:29 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR Notation
- Replies: 7
- Views: 371
Re: VSEPR Notation
I think the notation would just not include E at all. It could look something like AX5
- Sun Nov 17, 2019 11:16 pm
- Forum: Electronegativity
- Topic: Noble Gases
- Replies: 40
- Views: 12530
Re: Noble Gases
Noble gases typically are not included in the periodic trends. For electronegativity, they would have a very low value due to their filled valence shells.
- Sun Nov 03, 2019 11:24 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Atomic Orbitals
- Replies: 4
- Views: 348
Re: Atomic Orbitals
I think for this we would need to know that orbitals look the way they look because they have certain nodal planes where the electrons have a zero probability of existing. So like the p orbitals have two lobes because there is a nodal plane where an electron will never exist, and the s orbital is sp...
- Sun Nov 03, 2019 11:17 pm
- Forum: *Shrodinger Equation
- Topic: effective nuclear charge
- Replies: 6
- Views: 655
Re: effective nuclear charge
The effective nuclear charge is the net charge of the protons in the nucleus after taking into account the electron shielding. If you take away some of the electrons, the amount of electron shielding will decrease and the higher your effective nuclear charge will be.
- Sun Nov 03, 2019 11:04 pm
- Forum: Lewis Structures
- Topic: central atom
- Replies: 16
- Views: 2128
Re: central atom
The central atoms should be the least electronegative atom. My TA also mentioned that if you have a molecule and its like one of an element and 4 of another then the central atom will probably be the element that only has one.
- Sun Nov 03, 2019 10:33 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2989214
Re: Post All Chemistry Jokes Here
Did you hear about oxygen's date with potassium ??
It went OK.
It went OK.
- Sun Nov 03, 2019 10:27 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron configuration for D block
- Replies: 3
- Views: 191
Re: Electron configuration for D block
You only fill the 3d orbital before finishing the 4s orbital for Chromium and Copper (for this class because we don't go past the first row of the d-block). This happens because Cr almost has a half-filled d orbital and copper almost has a fully filled d orbital. A half or fully filled d orbital is ...
- Sun Oct 27, 2019 10:13 pm
- Forum: Ionic & Covalent Bonds
- Topic: electron configuration
- Replies: 5
- Views: 191
Re: electron configuration
I think Copper and Chromium are the exceptions we have to worry about for this class. They are different because they almost have a half-filled or filled d orbital. Having a half-filled or filled d orbital is more stable than the filled 4 s orbital and so it takes one of the 4s electrons. The electr...
- Sun Oct 27, 2019 10:06 pm
- Forum: Ionic & Covalent Bonds
- Topic: periodic table
- Replies: 10
- Views: 366
Re: periodic table
Kennedi3K wrote:Is this the same for ionization energy?
Yes the trend for ionization energy also increases as you go up and to the right.
- Sun Oct 27, 2019 10:04 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Spins
- Replies: 4
- Views: 234
Re: Spins
Based on Hund's Rule, electrons will always start parallel and fill up all of the orbitals with only one electron before going back and pairing up.
- Sun Oct 27, 2019 9:50 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Study Tips!
- Replies: 7
- Views: 292
Re: Study Tips!
I personally like to watch videos on youtube or khan academy for topics that I don't quite understand. One really great YouTuber is Bozeman Science.
- Sun Oct 27, 2019 9:39 pm
- Forum: Resonance Structures
- Topic: Drawing Resonance Structures
- Replies: 3
- Views: 166
Re: Drawing Resonance Structures
I think Professor Lavelle said in class that the resonance structures will be drawn with the double-sided arrows.
- Sun Oct 20, 2019 11:20 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Best Way To Study?
- Replies: 56
- Views: 3343
Re: Best Way To Study?
I think the modules are one of the most helpful tools for me because I am able to strengthen my understanding of the topics taught in lectures. It is easy to pause or rewind the video when you are confused, and the post-assessment questions are really helpful to make sure you know how to apply the c...
- Sun Oct 20, 2019 11:16 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Clarification on electron configuration
- Replies: 5
- Views: 241
Re: Clarification on electron configuration
I am pretty sure we just have to know the first row for the d-block.
- Sun Oct 20, 2019 11:09 pm
- Forum: Properties of Light
- Topic: Balmer and Lyman Series
- Replies: 5
- Views: 211
Re: Balmer and Lyman Series
The 1 and 2 are the names of the energy levels. It not like final and initial. When an excited electron starts at some higher level (2,3,4 or 5) and falls to the 1 energy level then it is in the Lyman series. When the excited electron starts at some higher level (3,4,or 5) and falls to the 2 energy ...
- Sun Oct 20, 2019 3:27 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Effect
- Replies: 7
- Views: 277
Re: Photoelectric Effect
An electron is not ejected because increasing the light's intensity only increases the number of photons. If your 10 photons don't have enough energy, adding 50 more of the same energy won't cause the electrons to eject. You must increase the energy of each of the photons allowing each to overcome t...
- Sun Oct 20, 2019 3:09 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing equations.
- Replies: 35
- Views: 2492
Re: Balancing equations.
I would say to try to balance the most difficult molecules first. Some molecules like O2 that are just one element can be easily adjusted without effecting other things you have previously balanced. If you leave these towards the end, then you will have to do less adjusting overall.
- Sun Oct 13, 2019 7:27 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2989214
Re: Post All Chemistry Jokes Here
Don't trust atoms, they make up eveything.
- Sun Oct 13, 2019 7:20 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Problem G13
- Replies: 2
- Views: 346
Re: Problem G13
The experiment needs to have 60 ml of the 0.5M solution. If you did not add the extra 48 ml of water, it would not be the right volume or molarity.
- Sun Oct 13, 2019 7:10 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 3 Homework Problems
- Replies: 1
- Views: 114
Week 3 Homework Problems
Hi :) I just wanted to confirm that the homework due for week three should be from the quantum world section.
- Sun Oct 13, 2019 7:04 pm
- Forum: Administrative Questions and Class Announcements
- Topic: How to check how many points I have this week for posting on Chemistry Community?
- Replies: 11
- Views: 346
Re: How to check how many points I have this week for posting on Chemistry Community?
Similar to everyone else, I have been going under the quick links section and keeping track for myself how many posts I have made.
- Sun Oct 13, 2019 7:01 pm
- Forum: General Science Questions
- Topic: Audio-Visual focus topics
- Replies: 4
- Views: 140
Re: Audio-Visual focus topics
I believe they are an extra resource to use for comprehension. I do not think that have a set deadline.
- Sun Oct 06, 2019 12:15 pm
- Forum: Empirical & Molecular Formulas
- Topic: Combustion Analysis
- Replies: 6
- Views: 271
Re: Combustion Analysis
If it is a hydrocarbon that is combusting and it combusts completely, then its the hydrocarbon and O2 on the reactant side and CO2 and H2O on the product side.