Search found 111 matches
- Thu Mar 12, 2020 12:50 pm
- Forum: General Rate Laws
- Topic: 7A.3
- Replies: 6
- Views: 467
Re: 7A.3
A rate is usually referred to as a positive number and already takes this into account
- Thu Mar 12, 2020 12:15 pm
- Forum: Administrative Questions and Class Announcements
- Topic: final
- Replies: 14
- Views: 979
Re: final
Mariah wrote:Brandi 2C wrote:** It's not on Sunday anymore. **
He said it was cancelled in the email!
But we are still having a final correct? We just don't have to be on campus.
Yes, we're still having a final. It'll be linked to Professor Lavelle's class website
- Tue Mar 10, 2020 8:28 pm
- Forum: Van't Hoff Equation
- Topic: What's the purpose of Van't Hoff?
- Replies: 5
- Views: 534
Re: What's the purpose of Van't Hoff?
The Van't Hoff equation relates how temperature changes equilibrium
- Tue Mar 10, 2020 8:27 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: calculating Q
- Replies: 12
- Views: 776
Re: calculating Q
Q= [anode]/[cathode]
- Tue Mar 10, 2020 8:26 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Ecell
- Replies: 5
- Views: 369
Re: Ecell
Ecell(o) is the standard potential, while Ecell is the overall potential of the cell
- Tue Mar 10, 2020 8:23 pm
- Forum: Administrative Questions and Class Announcements
- Topic: ENDGAME Review Session
- Replies: 71
- Views: 5721
Re: ENDGAME Review Session
Ghadir Seder 1G wrote:Can there please be a livestream for this review session that can be posted for reference after as well? This is absolutely the most helpful thing :(
Since classes are canceled, will the session still be happening or is it going to be recorded on zoom/bruincast/an online alternative?
- Tue Mar 10, 2020 8:20 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 2
- Replies: 5
- Views: 499
Re: Test 2
My test 2 was also updated in the grade book, so I'm guessing there should be an email on returning it soon
- Wed Mar 04, 2020 8:35 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6.L.7 b
- Replies: 1
- Views: 165
6.L.7 b
Why are we able to use O2 to balance the O for reduction and oxidation?
- Wed Mar 04, 2020 9:41 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6.L.5 D
- Replies: 2
- Views: 212
6.L.5 D
Can someone explain how to break down the oxidation and reduction half reactions? Au+(aq) --> Au(s) + Au^3+(aq)
I understand how you would use Au+-->Au(s), but why would you use Au^3+-->Au(s)?
I understand how you would use Au+-->Au(s), but why would you use Au^3+-->Au(s)?
- Tue Mar 03, 2020 2:24 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Example 6.L.1
- Replies: 1
- Views: 158
Example 6.L.1
Why is the value of n in Delta G= -nFEcell equal to 2? How do we determine the value of n in any general rxn?
- Tue Mar 03, 2020 2:21 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Galvanic cells
- Replies: 6
- Views: 504
Re: Galvanic cells
Yes! Galvanic cells are always spontaneous
- Tue Mar 03, 2020 2:20 pm
- Forum: Balancing Redox Reactions
- Topic: Acidic and Basic Reactions
- Replies: 9
- Views: 523
Re: Acidic and Basic Reactions
H+ is added to balance H in acidic reactions while OH- is added in basic reactions to the opposite side of the reaction to balance the H20 molecule(s)
- Tue Mar 03, 2020 2:12 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing half reactions in acidic conditions
- Replies: 8
- Views: 576
Re: Balancing half reactions in acidic conditions
You would use H+. Using H30+ would add more H's and an additional O to balance
- Tue Mar 03, 2020 2:09 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Sapling Learning
- Replies: 6
- Views: 593
Re: Sapling Learning
DesireBrown1J wrote:How do I access Sapling Learning?
I tried accessing it on a link he sent in one of his emails, but it required a payment method. The instructions said there was a way to avoid payment but I didn't see it.
- Sun Feb 23, 2020 11:15 pm
- Forum: Van't Hoff Equation
- Topic: what does it do?
- Replies: 13
- Views: 1017
Re: what does it do?
The Van't Hoff Equation helps relate K to the different values of T, since T affects K.
- Sun Feb 23, 2020 11:11 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Sapling Learning
- Replies: 6
- Views: 593
Sapling Learning
Has anyone tried the Sapling Learning supplements that Dr. Lavelle has prepared? I was wondering how beneficial it has been for other people.
- Sun Feb 23, 2020 11:06 pm
- Forum: Administrative Questions and Class Announcements
- Topic: about the Midterm...
- Replies: 8
- Views: 598
Re: about the Midterm...
I found the midterm difficult as well, mainly because I focused most of my time on studying the procedures for solving problems rather than understanding the conceptual material (which hurt my score the most). I had a similar experience in 14A, but I learned I have to just pick my head up and have s...
- Sun Feb 23, 2020 10:58 pm
- Forum: Balancing Redox Reactions
- Topic: Flow of electrons
- Replies: 11
- Views: 818
Re: Flow of electrons
Electrons will always go in the direction of the anode to the cathode
- Sun Feb 23, 2020 10:55 pm
- Forum: Balancing Redox Reactions
- Topic: spontaneous
- Replies: 15
- Views: 862
Re: spontaneous
If the standard reaction potential is positive, then the reaction is spontaneous
- Sun Feb 16, 2020 10:59 pm
- Forum: Balancing Redox Reactions
- Topic: Oxygen
- Replies: 9
- Views: 467
Re: Oxygen
Mitchell Koss 4G wrote:The same elements usually have the same oxidation numbers. The periodic table also has trends.
Can someone explain the periodic trends please?
- Sun Feb 16, 2020 10:58 pm
- Forum: Balancing Redox Reactions
- Topic: Seperating Redoz RXNS
- Replies: 7
- Views: 402
Re: Seperating Redoz RXNS
By separating the redox reactions, this means that the oxidation half is separated from the reduction half
- Sun Feb 16, 2020 10:53 pm
- Forum: Balancing Redox Reactions
- Topic: Electrochemisty
- Replies: 10
- Views: 668
Re: Electrochemisty
In a chemical reaction, there is an electric current that is produced and vice versa (such as when recharging a battery).
- Sun Feb 16, 2020 10:50 pm
- Forum: Balancing Redox Reactions
- Topic: oxidation vs reduction
- Replies: 19
- Views: 1028
Re: oxidation vs reduction
By definition, oxidation is when there is a loss of electrons (oxidation increases) and reduction is when there is a gain of electrons (oxidation decreases)
- Sun Feb 16, 2020 10:46 pm
- Forum: Van't Hoff Equation
- Topic: Enthalpy, Entropy, and Gibbs Free Energy
- Replies: 7
- Views: 369
Re: Enthalpy, Entropy, and Gibbs Free Energy
Delta G will not be constant because it is dependent on temperature and the temperatures will be different.
- Sun Feb 16, 2020 10:44 pm
- Forum: Van't Hoff Equation
- Topic: T1 and T2
- Replies: 7
- Views: 572
Re: T1 and T2
Since K is influenced by temperature, this is why there are separate K values for differing T values
- Sun Feb 16, 2020 10:42 pm
- Forum: Van't Hoff Equation
- Topic: Van't Hoff's Equation
- Replies: 3
- Views: 409
Re: Van't Hoff's Equation
The Van't Hoff Equation is used to find the temperature dependence of K and can be used to calculate K at a different temperature if delta H is known. Additionally, the difference between two Van't Hoff Equations can be evaluated to find lnK2-lnK1 (given that delta s and delta h are both constant).
- Mon Feb 10, 2020 2:34 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Heat capacity
- Replies: 6
- Views: 276
Re: Heat capacity
Based on today's lecture, Professor Lavelle said that it will be given either on the equation sheet or in the question
- Mon Feb 10, 2020 12:29 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: q rev
- Replies: 9
- Views: 344
Re: q rev
Q is the heat released/absorbed and rev refers to the fact that the reaction is reversible
- Mon Feb 10, 2020 12:22 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Spontaneous vs Favorable
- Replies: 8
- Views: 469
Re: Spontaneous vs Favorable
They both mean the same thing, that is the reaction will occur on its own without additional energy
- Mon Feb 10, 2020 12:18 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Cp v.Cv
- Replies: 6
- Views: 347
Re: Cp v.Cv
Cp is used when there is constant pressure while Cv is used when there is constant volume
- Sat Feb 08, 2020 7:41 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Constant T,P,V
- Replies: 4
- Views: 186
Constant T,P,V
In what instances will we know when temperature, pressure, or volume are held constant when calculating the change in entropy?
- Sun Feb 02, 2020 10:52 pm
- Forum: Phase Changes & Related Calculations
- Topic: ∆H
- Replies: 17
- Views: 681
Re: ∆H
Delta H is the easiest to determine if a reaction is positive or negative
- Sun Feb 02, 2020 10:50 pm
- Forum: Phase Changes & Related Calculations
- Topic: Relevance of Phase Changes
- Replies: 9
- Views: 476
Re: Relevance of Phase Changes
A phase change would mean that you would have to add the energy required for that phase change in order to calculate the overall enthalpy
- Sun Feb 02, 2020 10:46 pm
- Forum: Phase Changes & Related Calculations
- Topic: Why does steam cause burns?
- Replies: 29
- Views: 1280
Re: Why does steam cause burns?
Unlike boiling water, steam experiences a phase change when it comes into contact with skin and thus releases a larger amount of heat that causes severe burns.
- Sun Feb 02, 2020 10:45 pm
- Forum: Phase Changes & Related Calculations
- Topic: Pressure in an Open Beaker
- Replies: 10
- Views: 635
Re: Pressure in an Open Beaker
For an open beaker, you are assuming that the only pressure against it would be constant air pressure (1atm)
- Sun Feb 02, 2020 10:44 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Hess’ Law
- Replies: 10
- Views: 639
Re: Hess’ Law
Hess's Law establishes that the total enthalpy change for the reaction is the sum of all changes.
- Sun Feb 02, 2020 10:43 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Calculating q
- Replies: 5
- Views: 245
Re: Calculating q
Check to see what you are given. Based on whether you are solving for specific heat capacity or q, then you would know whether or not to use the mass
- Sun Feb 02, 2020 10:41 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Value of q
- Replies: 11
- Views: 593
Re: Value of q
n a perfect system, q lost/gained by system = q gained/lost by surroundings. <--- may be negative
- Tue Jan 28, 2020 2:10 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Hess's Law
- Replies: 11
- Views: 387
Re: Hess's Law
Hess's Law states that the enthalpy change at each step can be added to give the total enthalpy change, so you would use this when given the Delta H rxn is given for the different steps.
- Tue Jan 28, 2020 2:05 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Best Method of the 3 Given?
- Replies: 7
- Views: 264
Best Method of the 3 Given?
Given that there are 3 different methods to calculate the Delta H of a Reaction, which would be the most commonly used?
- Tue Jan 28, 2020 2:01 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Test 2
- Replies: 7
- Views: 260
Re: Test 2
Should just be from all material after the midterm, similar to 14a
- Tue Jan 28, 2020 1:59 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Bomb calorimetry
- Replies: 3
- Views: 130
Re: Bomb calorimetry
Bomb calorimeters would be used when you want to keep the volume constant. This would result in a pressure build up.
- Tue Jan 28, 2020 1:54 pm
- Forum: Phase Changes & Related Calculations
- Topic: Change in Temperature
- Replies: 10
- Views: 294
Re: Change in Temperature
Temperature is the only condition that will alter the K value. In an exothermic reaction, where heat is released, your constant will decrease. If the reaction is endothermic, where heat is absorbed, your constant will increase.
- Tue Jan 28, 2020 1:51 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE
- Replies: 20
- Views: 940
Re: ICE
You would set up an ICE table when given some significant value (ie. pH, pOH, K, etc.) and want to find the concentrations of the reactants and products in a chemical reaction. Usually questions tend to ask for the equilibrium concentrations after giving a K value and one initial concentration.
- Tue Jan 28, 2020 1:48 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Using Kc Vs Kp
- Replies: 22
- Views: 1071
Re: Using Kc Vs Kp
You would use Kc when given molar concentrations of solutions in any state and Kp when you're given partial pressures only in the gas state
- Tue Jan 28, 2020 1:46 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Le Chatelier's principle
- Replies: 7
- Views: 440
Re: Le Chatelier's principle
Le Chatelier's Principle helps determine how a chemical equilibrium will adjust in order to minimize the effects of a certain change in a condition. For example, if the temperature increases in an endothermic reaction, there will be a shift towards the products in order to compensate.
- Tue Jan 28, 2020 1:43 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Exothermic reaction
- Replies: 18
- Views: 737
Re: Exothermic reaction
In an exothermic reaction, since heat is being released as a result of the reactants, increasing the temperature would shift towards those reactants. Vice versa for the products: decreasing temperature would shift towards the products.
- Mon Jan 20, 2020 3:56 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 6.B.9
- Replies: 1
- Views: 76
6.B.9
Can pH be negative and can pH/pOH be a number greater than 14?
- Sun Jan 19, 2020 9:33 pm
- Forum: Ideal Gases
- Topic: When to use this equation
- Replies: 14
- Views: 500
Re: When to use this equation
PV=nRT is used to convert from a pressure of a gas back into a concentration
- Sun Jan 19, 2020 9:31 pm
- Forum: Ideal Gases
- Topic: R Constant
- Replies: 7
- Views: 282
Re: R Constant
The R values are different depending on the temperature used in the reaction
- Sun Jan 19, 2020 9:29 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: 5% rule
- Replies: 10
- Views: 500
Re: 5% rule
The 5% Rule essentially means you can approximate the value for x on an ice table because the value is so small it doesn't make a significant change in the concentration. For example, Professor Lavelle talked about how a millionaire giving away $1,000 would barely notice the difference.
- Sun Jan 19, 2020 9:24 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K vs Q
- Replies: 14
- Views: 412
Re: K vs Q
Usually the question will ask you to find the reaction quotient Q, which you will then compare to the given K to see if the reaction is already at equilibrium or if the reactants/products are favored.
- Sun Jan 19, 2020 9:22 pm
- Forum: Ideal Gases
- Topic: Topics on Test 1
- Replies: 37
- Views: 1413
Re: Topics on Test 1
In my discussion my TA said we should know everything regarding chemical equilibrium and acids/bases
- Sun Jan 19, 2020 4:18 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 5.I.11/13
- Replies: 2
- Views: 113
5.I.11/13
Just confirming, when calculating for K or Q, the concentrations will have to be converted into moles/liter if the concentrations given are in mmol correct?
- Sat Dec 07, 2019 10:21 pm
- Forum: Air Pollution & Acid Rain
- Topic: Acid rain
- Replies: 2
- Views: 291
Re: Acid rain
This is the chemical equation that you should know
H2O + CO2 --> H2CO3
H2O + CO2 --> H2CO3
- Sat Dec 07, 2019 10:16 pm
- Forum: Properties & Structures of Inorganic & Organic Bases
- Topic: Which is the stronger acid?
- Replies: 9
- Views: 1026
Re: Which is the stronger acid?
Having more one more O will increase stability because the negative charge is dispersed more, which increases stability.
- Sat Dec 07, 2019 10:14 pm
- Forum: Conjugate Acids & Bases
- Topic: how to figure out?
- Replies: 12
- Views: 730
Re: how to figure out?
A conjugate base is what is left of an acid when a proton is removed
- Sat Dec 07, 2019 10:09 pm
- Forum: Amphoteric Compounds
- Topic: Amphiprotic
- Replies: 7
- Views: 555
Amphiprotic
What is the significance of an amphiprotic compound?
- Sat Dec 07, 2019 10:08 pm
- Forum: Conjugate Acids & Bases
- Topic: what materials to cover for final
- Replies: 2
- Views: 276
Re: what materials to cover for final
You can go down the outlines on his website as well, understanding those concepts will be important
- Sun Dec 01, 2019 11:08 pm
- Forum: Amphoteric Compounds
- Topic: Identifying Them?
- Replies: 12
- Views: 902
Re: Identifying Them?
An amphoteric compound can either accept or donate protons/hydrogen atoms.
- Sun Dec 01, 2019 11:07 pm
- Forum: Bronsted Acids & Bases
- Topic: Final
- Replies: 13
- Views: 867
Re: Final
I believe that he will also be doing practice problems this week that should help prepare us for the final
- Sun Dec 01, 2019 11:03 pm
- Forum: Biological Examples
- Topic: Vitamin B12
- Replies: 3
- Views: 258
Vitamin B12
What should we know about Vitamin B12 for the final?
- Sun Dec 01, 2019 11:02 pm
- Forum: Biological Examples
- Topic: Cisplatin
- Replies: 12
- Views: 664
Re: Cisplatin
Cisplatin is a chemotherapy drug that stops cell division by forming a coordination compound with DNA by bonding with the N7 Guanine lone pair. It is important to note that Transplatin does not have the same effect because the Cl's are on opposite sides.
- Sun Dec 01, 2019 10:59 pm
- Forum: *Molecular Orbital Theory Applied To Transition Metals
- Topic: Transition metals
- Replies: 11
- Views: 1106
Re: Transition metals
Transition metals are located in the d-block (groups 3-12)
- Sun Nov 24, 2019 5:42 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Molecular shape vs Electron Configuration
- Replies: 4
- Views: 436
Re: Molecular shape vs Electron Configuration
Electron configuration is the arrangement of the electrons in a molecule. However, the molecular shape doesn't necessarily follow the electron configuration (though it is influenced by it). For example, a molecule could have a tetrahedral electron configuration but if it has a lone pair, that means ...
- Sun Nov 24, 2019 5:39 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Use of Bronsted or Lewis Definitions
- Replies: 7
- Views: 398
Use of Bronsted or Lewis Definitions
In regards to our class, should we use the Bronsted definition or Lewis definition?
- Sun Nov 24, 2019 5:35 pm
- Forum: *Molecular Orbital Theory Applied To Transition Metals
- Topic: Transition Metals
- Replies: 1
- Views: 701
Transition Metals
Why do transition metal cations specifically form complexes?
- Sun Nov 24, 2019 5:33 pm
- Forum: Biological Examples
- Topic: Ring structure
- Replies: 2
- Views: 182
Re: Ring structure
A ring structure forms when a chelate forms a ring of atoms around the central metal atom. Another example would be [CoN4(CH2)4].
- Sun Nov 24, 2019 5:25 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: What is a coordinate number?
- Replies: 3
- Views: 256
Re: What is a coordinate number?
A coordinate number represents the number of bonds with ligands attached to the central atom. For example, [Fe(CN)6]^4- has a coordination # of 6.
- Sun Nov 24, 2019 5:23 pm
- Forum: Biological Examples
- Topic: cisplatin
- Replies: 6
- Views: 429
Re: cisplatin
Cisplatin forms a coordination compound with DNA, which stops the rapid and controllable cell division of cancer cells. However, it does not single out cancer cells specifically, and can stop the division of normal cells as well
- Mon Nov 18, 2019 11:11 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: 3.F.1 c and d
- Replies: 1
- Views: 119
3.F.1 c and d
Can someone explain why there are dipole-dipole forces present in 3.F.1 c and d?
- Sun Nov 17, 2019 11:43 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 of Forces
- Replies: 1
- Views: 146
Strength of Forces
What is the order for the strength of interionic and intermolecular forces?
- Sun Nov 17, 2019 6:37 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Grading
- Replies: 7
- Views: 472
Re: Grading
From what I've read the curve occurs after the final, but usually it doesn't deviate too much from the standard 70% C, 80% B, and 90% A scale.
- Sun Nov 17, 2019 6:35 pm
- Forum: Hybridization
- Topic: Test 2 Topics
- Replies: 11
- Views: 714
Re: Test 2 Topics
Dr. Lavelle also explicitly said Hybridization would not be on Test 2
- Sun Nov 17, 2019 6:34 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: repulsion strength
- Replies: 5
- Views: 307
Re: repulsion strength
lone pair - lone pair has the strongest repulsion, lone pair - atom has the second strongest repulsion, and atom -atom has the least strongest repulsion.
- Sun Nov 17, 2019 6:32 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Prediction of Angles
- Replies: 4
- Views: 299
Re: Prediction of Angles
The bond angles usually follow the same sort of pattern based on regions of electron concentration. It is important to keep in mind the lone pairs though, because these will decrease the expected bond angle.
- Sun Nov 17, 2019 6:27 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Dispersion
- Replies: 5
- Views: 345
Re: Dispersion
I do also know that Dr. Lavelle said that he would focus on covering sigma and pie bonds on Monday, so if he doesn't mention those then I would go over them anyways
- Mon Nov 11, 2019 10:46 am
- Forum: Dipole Moments
- Topic: Dipole Moments
- Replies: 6
- Views: 374
Re: Dipole Moments
Andrea_3F wrote:So can dipole moments be temporary or all they all permanent?
I believe dipole moments are permanent
- Mon Nov 11, 2019 10:43 am
- Forum: Dipole Moments
- Topic: Dipole Moment
- Replies: 6
- Views: 345
Re: Dipole Moment
I believe you can also recognize a dipole moment when there is a polar covalent bond, which by definition is when electrons in a covalent bond are not equally shared.
- Mon Nov 11, 2019 10:39 am
- Forum: Bond Lengths & Energies
- Topic: London Forces
- Replies: 6
- Views: 356
Re: London Forces
Yes, there are electrons in every atom and these cause these forces
- Mon Nov 11, 2019 10:37 am
- Forum: Bond Lengths & Energies
- Topic: Van Der Waals BP
- Replies: 6
- Views: 317
Van Der Waals BP
Which intermolecular force increases boiling point the most?
- Mon Nov 11, 2019 10:32 am
- Forum: Dipole Moments
- Topic: Dissociation Energies
- Replies: 3
- Views: 160
Dissociation Energies
Why is dissociation energy, which is required to break a bond, always positive?
- Sun Nov 03, 2019 11:43 pm
- Forum: Electronegativity
- Topic: Electronegativity Ex.
- Replies: 3
- Views: 255
Electronegativity Ex.
How would you determine which bond has greater ionic character between HCl and HI?
- Sun Nov 03, 2019 11:40 pm
- Forum: Coordinate Covalent Bonds
- Topic: Coordinate Covalent Bond
- Replies: 2
- Views: 522
Coordinate Covalent Bond
Does a coordinate covalent bond only occur with Lewis acids and Bases? (I know Boron Trifluoride was given as an example)
- Sun Nov 03, 2019 11:30 pm
- Forum: Lewis Structures
- Topic: Expanded Octet
- Replies: 4
- Views: 226
Expanded Octet
Lewis structures with expanded octets have lower energy than with the regular octet structure (comparing the formal charge), so is it more stable and therefore more favorable to draw structures with expanded octets?
- Sun Nov 03, 2019 11:24 pm
- Forum: Octet Exceptions
- Topic: Period 3
- Replies: 2
- Views: 173
Period 3
Why can atoms in the third period or higher accommodate more than 8 valence electrons?
- Sun Nov 03, 2019 11:02 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Distorted e- as highly polarizable
- Replies: 5
- Views: 491
Distorted e- as highly polarizable
Why are highly distorted electrons described as being highly polarizable? Which characteristics result in the ionic bond being more covalent in character?
- Sun Nov 03, 2019 10:57 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Kinetic Energy Uncertainty Conversion
- Replies: 3
- Views: 340
Re: Kinetic Energy Uncertainty Conversion
Kevin Antony 1J wrote:From what I gather, you know have energy per electron. We know there are 6.022 x 10^23 electrons in a mol. If you divide by Avagadro's number you should get energy per mol.
That makes sense, thank you!
- Sun Nov 03, 2019 10:55 pm
- Forum: Resonance Structures
- Topic: Drawing Resonance Structures
- Replies: 2
- Views: 146
Drawing Resonance Structures
During my discussion, it was mentioned that when drawing resonance structures that if, let's say there's two double bonds, you can hold that one double bond constant and rotate the other around to other pairs. Would this account for all of the possible answers that would be required for a question a...
- Sun Nov 03, 2019 8:45 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Kinetic Energy Uncertainty Conversion
- Replies: 3
- Views: 340
Kinetic Energy Uncertainty Conversion
In the Heisenberg Indeterminacy Module, question 22 asked for the uncertainty in kinetic energy (which I was able to calculate) and the conversion of that into moles. How would I do that?
- Sun Nov 03, 2019 8:42 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Manipulating for the initial energy level
- Replies: 2
- Views: 220
Manipulating for the initial energy level
When we're solving for the initial energy level in a transition using E=hv and E= -hR/(n^2 final) + hR/(n^2 initial), should the manipulation to find the initial energy level be done at the beginning of the problem to isolate n initial or should you just plug in the values and solve for it algebraic...
- Wed Oct 16, 2019 10:58 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: What does the "x" indicate in (i.e.) the 2px state? [ENDORSED]
- Replies: 5
- Views: 405
Re: What does the "x" indicate in (i.e.) the 2px state? [ENDORSED]
The x is in reference to the plane, among the x, y, and z planes
- Wed Oct 16, 2019 10:54 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Stern and Gerlach
- Replies: 5
- Views: 276
Re: Stern and Gerlach
My key takeaway from the experiment was that electrons have different spins (spin up vs. spin down), which create different electric fields.
- Wed Oct 16, 2019 10:42 pm
- Forum: *Shrodinger Equation
- Topic: Hamiltonian
- Replies: 5
- Views: 324
Re: Hamiltonian
A Hamiltonian is a second derivative (ie. d/dx[sinx]= cosx d/dx[cosx]= -sinx)
- Wed Oct 16, 2019 10:38 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Best Way To Study?
- Replies: 56
- Views: 3567
Re: Best Way To Study?
Hi! I've found it very helpful to take lecture notes on a notepad, then the following day condensing the notes into a separate notebook. I've found it really useful in helping the information stick and it makes referring to my notes so much easier. It'll also help having a notebook full of notes for...
- Wed Oct 16, 2019 10:34 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Incorrect Atom Model
- Replies: 3
- Views: 247
Incorrect Atom Model
What specifically makes the answer from the incorrect atom model's (electron located inside of the nucleus) application of the Heisenberg Equation 'unrealistic?'
- Wed Oct 16, 2019 10:25 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Untrue PSI From Lecture
- Replies: 2
- Views: 124
Untrue PSI From Lecture
At the end of today's lecture, Lavelle wrote some PSI values on the board and said that they were untrue. One of them was PSI (1, 1, 0, +1/2); can someone explain why this wouldn't be able to exist?
- Sun Oct 13, 2019 9:14 pm
- Forum: DeBroglie Equation
- Topic: Concept of a wave
- Replies: 7
- Views: 543
Re: Concept of a wave
DeBroglie is used when detecting extremely small masses (unlike the car example in lecture).
- Sun Oct 13, 2019 12:07 am
- Forum: Properties of Light
- Topic: e=hv
- Replies: 7
- Views: 488
Re: e=hv
e=hv is in regards to energy per photon, which directly relates to light.
- Sun Oct 13, 2019 12:06 am
- Forum: DeBroglie Equation
- Topic: De Broglie's Equation
- Replies: 13
- Views: 569
Re: De Broglie's Equation
De Broglie is applied when we are solving for an object's wavelength, and the the resting mass is given. For example, it could be the baseball being hit or a car moving.