Search found 107 matches
- Sat Mar 13, 2021 10:23 pm
- Forum: Second Order Reactions
- Topic: Determining slow step
- Replies: 22
- Views: 1089
Re: Determining slow step
Many questions will straight up tell you which step is the slow step, but in case it doesn't, the slow step tends to make up the overall rate law.
- Sat Mar 13, 2021 9:14 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Calculating n
- Replies: 17
- Views: 921
Re: Calculating n
n in this case isn't moles of a gas but number of electrons transferred.
- Sat Mar 13, 2021 7:41 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: When to use Delta S=qrev/T vs. Delta S = nRlnv2/v1
- Replies: 1
- Views: 216
When to use Delta S=qrev/T vs. Delta S = nRlnv2/v1
When do you use Delta S=qrev/T and when do you use Delta S = nR lnv2/v1
- Thu Mar 11, 2021 7:37 pm
- Forum: Calculating Work of Expansion
- Topic: W= -PDeltaV
- Replies: 15
- Views: 1828
W= -PDeltaV
When do you use this equation? Is it for only irreversible volume expansions? Are there any limitations to the usage of this equation?
- Mon Mar 08, 2021 4:21 pm
- Forum: General Rate Laws
- Topic: Multiple Pathways to a Rate Law
- Replies: 2
- Views: 258
Multiple Pathways to a Rate Law
For a experimentally derived rate law, is it possible to have more than one specific pathway that would lead to the rate law?
- Sun Mar 07, 2021 4:47 am
- Forum: General Rate Laws
- Topic: Number of Reactants
- Replies: 26
- Views: 1031
Re: Number of Reactants
It is definitely possible but I think the odds are very slim.
- Sun Mar 07, 2021 2:28 am
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Rate Laws
- Replies: 7
- Views: 437
Re: Rate Laws
Unless the question gives you all the variables needed to calculate the rate law, probably.
- Sun Mar 07, 2021 1:49 am
- Forum: General Rate Laws
- Topic: Determining # order
- Replies: 5
- Views: 322
Re: Determining # order
# order is the summation of each individual reactants order. Thus assuming that one of the two reactants second order and the other is first order, it would be a third order reaction.
- Sun Mar 07, 2021 1:46 am
- Forum: Balancing Redox Reactions
- Topic: Half-Reactions
- Replies: 11
- Views: 556
Re: Half-Reactions
I'm assuming half reactions will probably not be given on the exam because it's fundamental to understanding how to balance redox equations. But I'm not sure.
- Sun Mar 07, 2021 1:44 am
- Forum: Second Order Reactions
- Topic: Zero-Order Catalysts
- Replies: 9
- Views: 631
Re: Zero-Order Catalysts
By saturation, he means that all the enzymes are currently in use and even by adding more of the reactant, the reaction rate wouldn't increase.
- Sun Mar 07, 2021 1:40 am
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Concept of Order (n)
- Replies: 7
- Views: 416
Re: Concept of Order (n)
Order of a reaction is the number of molecules/elements that need to come together at an instantaneous moment to allow the reaction to proceed. As a result, higher order reactions are more rare.
- Sun Feb 28, 2021 7:46 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: anode vs. cathode
- Replies: 12
- Views: 690
Re: anode vs. cathode
The way I remember it is that the Anode is the place electrons flow Away from.
- Sun Feb 28, 2021 7:42 pm
- Forum: Balancing Redox Reactions
- Topic: states of matter
- Replies: 58
- Views: 2119
Re: states of matter
Yes, you should almost always include states of matter unless the question tells you that you don't need to.
- Sun Feb 28, 2021 7:35 pm
- Forum: Balancing Redox Reactions
- Topic: Determining Phases
- Replies: 28
- Views: 980
Re: Determining Phases
I tend to compare it to the original, unbalanced equation that the problem gave me. Odds are, the phases will be identical after you balance it. Then, for H2O it would be liquid, and ions would be aq.
- Sun Feb 28, 2021 6:57 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Sapling #12
- Replies: 2
- Views: 169
Re: Sapling #12
I think you multiplied stoichiometric coefficents to the standard potential. Standard potential doesn't change with the stoichiometric coefficients. Hopefully this will solve your problem.
- Sun Feb 28, 2021 5:05 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Shorthand Notation for Electrolytic Cells
- Replies: 2
- Views: 288
Shorthand Notation for Electrolytic Cells
Could someone explain to me how shorthand notation works?
- Sun Feb 21, 2021 10:06 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: qrev
- Replies: 27
- Views: 1495
Re: qrev
Qrev is the heat transferred from a reversible process.
- Sun Feb 21, 2021 10:04 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: State function?
- Replies: 36
- Views: 1276
Re: State function?
Cell potential is a path function because we cannot subtract final cell potential from initial.
- Sun Feb 21, 2021 10:03 pm
- Forum: Calculating Work of Expansion
- Topic: Negative vs Positive Work
- Replies: 13
- Views: 714
Re: Negative vs Positive Work
Work done to the system is negative and work done on the system is positive.
- Sun Feb 21, 2021 10:01 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Can We Review our Exams?
- Replies: 69
- Views: 2933
Re: Can We Review our Exams?
You would have to ask a TA during their office hour.
- Fri Feb 19, 2021 12:05 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: Exercise 4G Question 5
- Replies: 4
- Views: 282
Re: Exercise 4G Question 5
Why do we power W with avogadros constant? Is it because we are calculating the delta S in units of mol?
- Sun Feb 14, 2021 3:58 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Entropy: kJ or J?
- Replies: 30
- Views: 1475
Re: Entropy: kJ or J?
As long as you pay attention to what the question is asking, there should be no problem.
- Sun Feb 14, 2021 3:56 pm
- Forum: Phase Changes & Related Calculations
- Topic: Entropy of vaporization
- Replies: 7
- Views: 342
Re: Entropy of vaporization
Another question, why is it that the greater the Svap, the more ordered it is?
- Sun Feb 14, 2021 3:49 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: when K=1
- Replies: 12
- Views: 460
Re: when K=1
K=1 is rare because it means both sides of a reaction isn't really favored, meaning that the reaction won't go in any way specifically.
- Sun Feb 14, 2021 3:46 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: kJ/K*mol vs J/K*mol
- Replies: 7
- Views: 290
Re: kJ/K*mol vs J/K*mol
Yes you can as long as your units match in the end.
- Sun Feb 14, 2021 3:43 pm
- Forum: Phase Changes & Related Calculations
- Topic: Entropy of vaporization
- Replies: 7
- Views: 342
Entropy of vaporization
How do you calculate Svap?
- Sun Feb 07, 2021 1:58 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: How to know the sign for work
- Replies: 26
- Views: 895
Re: How to know the sign for work
I think work done by the system is negative and work done to the system is positive.
- Sun Feb 07, 2021 1:55 am
- Forum: General Science Questions
- Topic: Careless Mistakes
- Replies: 54
- Views: 3314
Re: Careless Mistakes
It happens to me too! I think the best way to lessen careless mistakes is to double check as you do a problem. I've found that that has worked for me.
- Fri Feb 05, 2021 1:21 am
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Work Definition
- Replies: 33
- Views: 1031
Re: Work Definition
Work is energy transferred from one thing to another.
- Fri Feb 05, 2021 1:19 am
- Forum: Ideal Gases
- Topic: Chem BL
- Replies: 107
- Views: 7132
Re: Chem BL
I'm probably going to take chem 14c and BL together next fall.
- Fri Feb 05, 2021 1:17 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: closed system
- Replies: 43
- Views: 1468
Re: closed system
In a closed system, matter cannot be exchanged, thus volume won't change as well
- Sun Jan 31, 2021 4:03 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Temperature vs Heat
- Replies: 5
- Views: 232
Re: Temperature vs Heat
We would be focusing on change in heat rather than temperature although they technically go hand in hand.
- Sun Jan 31, 2021 4:01 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: perfect system
- Replies: 20
- Views: 777
Re: perfect system
It means we are assuming that no energy is lost from a reaction and stays within the system.
- Sun Jan 31, 2021 3:59 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: change in celsius = change in kelvin
- Replies: 22
- Views: 7601
Re: change in celsius = change in kelvin
Kelvin is equal to Celsius plus 273, thus if you're adding one to Celsius, you are also adding one to kelvin.
- Sun Jan 31, 2021 3:55 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Standard Enthalpies of Formation using Hess's Law
- Replies: 18
- Views: 1002
Re: Standard Enthalpies of Formation using Hess's Law
You can switch it, but when u switch it, make sure to switch the sign of enthalpy too.
- Sun Jan 31, 2021 3:54 am
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: pOH and pKb
- Replies: 5
- Views: 321
Re: pOH and pKb
That's correct!
- Thu Jan 28, 2021 7:26 pm
- Forum: Polyprotic Acids & Bases
- Topic: Ignoring Second Deprotonation
- Replies: 2
- Views: 324
Re: Ignoring Second Deprotonation
is there a specific cut off point for this though? Like a difference of 10^-3 or more?
- Sun Jan 24, 2021 7:47 pm
- Forum: Phase Changes & Related Calculations
- Topic: Define Phase Change
- Replies: 78
- Views: 4909
Re: Define Phase Change
Phase change is when a substance changes from one state of matter to another
- Sun Jan 24, 2021 7:46 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Ice Tables
- Replies: 28
- Views: 958
Re: Ice Tables
if its a reactant, -x, if its a product, +x
- Sun Jan 24, 2021 11:32 am
- Forum: Phase Changes & Related Calculations
- Topic: Steam causing severe burns
- Replies: 19
- Views: 767
Re: Steam causing severe burns
It probably depends on the concentration of vapor hitting your skin at once.
- Sun Jan 24, 2021 11:29 am
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm
- Replies: 18
- Views: 589
Re: Midterm
For anyone wondering, midterm is this Friday.
- Sun Jan 24, 2021 11:24 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: How to predict relative strengths of acids and bases
- Replies: 5
- Views: 268
Re: How to predict relative strengths of acids and bases
a high kb also indicates a strong base and a low ka would also indicate a strong base.
- Sun Jan 17, 2021 6:15 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Pressure Rule
- Replies: 29
- Views: 1310
Re: Pressure Rule
Only count moles of gas.
- Sun Jan 17, 2021 2:49 am
- Forum: General Science Questions
- Topic: Conjugate Acids and Bases
- Replies: 4
- Views: 185
Re: Conjugate Acids and Bases
I think it highlights the reversible action of a acid base reaction. In cases where the acid/base aren't strong, the conjugates could potentially play a role in regulating environments (pH), such as bicarbonate in the ocean and our blood.
- Sun Jan 17, 2021 2:46 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Kelvin or Celsius?
- Replies: 86
- Views: 5172
Re: Kelvin or Celsius?
use kelvin.
- Sun Jan 17, 2021 2:39 am
- Forum: General Science Questions
- Topic: Significant Figures and Rounding
- Replies: 9
- Views: 442
Re: Significant Figures and Rounding
The good thing is, there is essentially no homework graded for this class except sapling, and you have infinite attempts per question, so I wouldn't worry about sig figs in that aspect.
- Sun Jan 17, 2021 2:37 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ka vs kb
- Replies: 20
- Views: 474
Re: ka vs kb
Yes, Ka is for acids and Kb is for bases.
- Sun Jan 17, 2021 2:31 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: H2O as a Gas
- Replies: 69
- Views: 6143
Re: H2O as a Gas
We include gases, except for inert gases.
- Sun Jan 17, 2021 2:29 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: q vs k
- Replies: 62
- Views: 2371
Re: q vs k
Q calculates the same way as K, but Q calculates at concentrations that aren't equilibrium.
- Sun Jan 10, 2021 4:09 am
- Forum: Student Social/Study Group
- Topic: Study Habits
- Replies: 96
- Views: 5404
Re: Study Habits
I heard of step up sessions but I don't know what happens there. Could someone fill me in on those? I'm kind of interested in attending one this quarter.
- Sun Jan 10, 2021 4:04 am
- Forum: Ideal Gases
- Topic: Advice on how to navigate Chem Community
- Replies: 17
- Views: 813
Re: Advice on how to navigate Chem Community
It can feel a bit overwhelming, something that has helped me was the active topic section you can find under quick links, it gave me a way to find relevant topics that I can reply to!
- Sun Jan 10, 2021 4:00 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Definition of an Inert Gas
- Replies: 15
- Views: 890
Re: Definition of an Inert Gas
An inert gas is a element that doesn't react to other elements because it's valence shell is filled. Often it is the noble gases because the valence shell is filled.
- Sun Jan 10, 2021 3:48 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Counting Moles
- Replies: 11
- Views: 492
Re: Counting Moles
Only gases are counted!
- Sun Jan 10, 2021 3:40 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Q and K
- Replies: 13
- Views: 424
Re: Q and K
How would you be able to calculate K if you're only given concentrations for Q? They would typically give K to you right?
- Sat Dec 12, 2020 3:34 pm
- Forum: Naming
- Topic: Bis, Tris, Tetrakis
- Replies: 4
- Views: 514
Bis, Tris, Tetrakis
If a molecule has the prefix bis, tris, tetrakis, etc, would that prefix be counted when looking to name the coordination compound? I'm asking because, for question 9c.3, part d named the compound: sodium bisoxalato(diaqua)ferrate(III), when if following the rules, aqua would be first instead of oxa...
- Sat Dec 12, 2020 2:55 pm
- Forum: Calculating the pH of Salt Solutions
- Topic: Textbook Question 6D.11
- Replies: 2
- Views: 160
Re: Textbook Question 6D.11
Me too. Also, does Al3+ make it's surrounding solution acidic because it can give off protons or is it accepting electrons?
- Fri Dec 11, 2020 1:49 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Chelating Ligands
- Replies: 2
- Views: 208
Chelating Ligands
Can trans- orientated ligands be bidentate? More specifically, C2C04?
- Thu Dec 10, 2020 11:39 am
- Forum: Conjugate Acids & Bases
- Topic: Can strong acids become conjugate bases?
- Replies: 6
- Views: 340
Can strong acids become conjugate bases?
If the pH is low enough, can a strong acid become a conjugate base?
- Thu Dec 10, 2020 11:28 am
- Forum: Amphoteric Compounds
- Topic: Strong Acid and Amphoteric?
- Replies: 3
- Views: 336
Strong Acid and Amphoteric?
When learning about Amphoteric molecules, I noticed that the strong acid H2S04, when deprotonated, has a similar structure as other Amphoteric molecules. However, can it be considered a amphoteric molecule if it is a strong acid?
- Sun Dec 06, 2020 10:07 pm
- Forum: Naming
- Topic: Monodentates and Polydentates
- Replies: 8
- Views: 571
Re: Monodentates and Polydentates
So is dentate synonymous with ligand?
- Sun Dec 06, 2020 10:04 pm
- Forum: Naming
- Topic: "(en)" Sapling
- Replies: 19
- Views: 856
Re: "(en)" Sapling
(en) is short for ethylenediamine. I'm pretty sure there are more compounds that have similar naming nature so make sure to read about those ones too as it might be on the test!
- Sat Dec 05, 2020 9:07 pm
- Forum: Biological Examples
- Topic: Hemoglobin vs. Myoglobin
- Replies: 30
- Views: 1223
Re: Hemoglobin vs. Myoglobin
Hemoglobin is 4 myoglobin put together. As a result, hemoglobin can carry more oxygen at one time.
- Sat Dec 05, 2020 8:54 pm
- Forum: Amphoteric Compounds
- Topic: How to know if a molecule is amphoteric
- Replies: 9
- Views: 1911
Re: How to know if a molecule is amphoteric
I think amphoteric compounds tend to typically have polar bond when containing a H. As a result, there is a H to be donated. If it is donated, there is potential for it to re-accept the H as well.
- Sat Dec 05, 2020 8:44 pm
- Forum: Lewis Acids & Bases
- Topic: Bronsted vs. Lewis bases
- Replies: 11
- Views: 350
Re: Bronsted vs. Lewis bases
Lewis bases donate electrons, Bronstead bases accept protons. Essentially they are the same thing.
- Sun Nov 29, 2020 6:45 pm
- Forum: Administrative Questions and Class Announcements
- Topic: 14B Enrollment [ENDORSED]
- Replies: 67
- Views: 15682
Re: 14B Enrollment [ENDORSED]
I am currently waitlisted for the winter quarter and according to Prof. Lavelle, I'll be able to get in. But I'm wondering how PTE and enrollment works. Could someone explain it? Thanks.
- Sun Nov 29, 2020 6:31 pm
- Forum: Lewis Structures
- Topic: Octet rule
- Replies: 12
- Views: 622
Re: Octet rule
Hydrogen is also an exception to the octet rule!
- Sun Nov 29, 2020 6:28 pm
- Forum: Dipole Moments
- Topic: Tetrahedral Atoms and Dipole Moments
- Replies: 7
- Views: 393
Re: Tetrahedral Atoms and Dipole Moments
Dipole moments can only be cancelled out on a Tetrahedral Atom when it is four of the same elements bonded to a central element. (CCl4)
- Sun Nov 29, 2020 6:25 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: molecule shape polarity
- Replies: 5
- Views: 290
Re: molecule shape polarity
It has to do with dipole moments. A molecule could have all polar covalent bonds and still be nonpolar due to it's shape because the bonds are directly 180 degrees away from each other. H20, because it is bent, not linear, has dipoles that aren't cancelled out. BeCl2, on the other hand, also has pol...
- Sun Nov 29, 2020 6:20 pm
- Forum: Hybridization
- Topic: Sapling #18
- Replies: 10
- Views: 412
Re: Sapling #18
I also was very confused with this problem, is there any way it has to do with the number of double bonds as well?
- Sun Nov 29, 2020 6:16 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Knowing VESPR for final
- Replies: 5
- Views: 279
Re: Knowing VESPR for final
I'm pretty sure we need to memorize all the ones Prof. Lavelle goes over.
- Sun Nov 22, 2020 6:23 pm
- Forum: Ionic & Covalent Bonds
- Topic: Covalent Character
- Replies: 33
- Views: 1425
Re: Covalent Character
To determine covalent character in ionic bonds, you find the DEN of the elements. The lower the DEN, the more covalent it is.
- Sun Nov 22, 2020 6:22 pm
- Forum: Octet Exceptions
- Topic: Expanded Octets
- Replies: 11
- Views: 569
Re: Expanded Octets
Out of curiosity, does anyone know if there is a certain max number of electrons in a expanded octet?
- Sun Nov 22, 2020 6:18 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: London Forces [ENDORSED]
- Replies: 19
- Views: 776
Re: London Forces [ENDORSED]
Yes. It is super weak and only lasts for a brief moment.
- Sun Nov 22, 2020 6:16 pm
- Forum: Lewis Structures
- Topic: Electron Density
- Replies: 14
- Views: 601
Re: Electron Density
Hi. Electron density is basically where a certain electron could be at any given point.
- Tue Nov 17, 2020 6:26 pm
- Forum: Student Social/Study Group
- Topic: Midterm 2
- Replies: 3
- Views: 233
Midterm 2
Prof. Lavelle said in his class website that midterm 2 is up to chemical bonds, does that mean vsper model are not part of the midterm? And if anyone knows, where in the textbook does content go up to? Thanks.
- Sat Nov 14, 2020 9:11 pm
- Forum: Resonance Structures
- Topic: Formal Charge influence on Resonance Structure
- Replies: 4
- Views: 164
Re: Formal Charge influence on Resonance Structure
And if so, does overall formal charge sum also always indicate the overall charge of the molecule?
- Sat Nov 14, 2020 9:10 pm
- Forum: Resonance Structures
- Topic: Formal Charge influence on Resonance Structure
- Replies: 4
- Views: 164
Formal Charge influence on Resonance Structure
Just to clarify, resonance structures are most stable/tend to favor positions where formal charge on each atom is zero right?
- Sat Nov 14, 2020 8:54 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge Formula
- Replies: 4
- Views: 205
Re: Formal Charge Formula
In this equation, the lone stands for all of the free/unbonded electrons. Don't think of it as lone pairs as you might count two electrons as one pair and plug 1 in the equation. Think of it as the individual electrons, so in this example it would be 2 electrons and you would use 2 in the FC equati...
- Sat Nov 14, 2020 8:52 pm
- Forum: Octet Exceptions
- Topic: Radicals
- Replies: 7
- Views: 275
Re: Radicals
Is there a way to predict which element in an atom will have the radical? this came up in textbook problem 2C.5. The radical went with Cl rather than O, and I can't explain why except for that Cl has an odd number of valence electrons to start with. Hi! I believe that the placement of the lone elec...
- Sat Nov 14, 2020 8:46 pm
- Forum: Ionic & Covalent Bonds
- Topic: Electronegativity
- Replies: 18
- Views: 619
Re: Electronegativity
To calculate electronegativity, there is a specific periodic table that shows the electronegativity of every element. However, I think when not asked to detemine the specific DEN, one can base it off of periodic trends (ie far left is more electromotive than far right) and determine an idea of elect...
- Sat Nov 14, 2020 8:44 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge Formula
- Replies: 4
- Views: 205
Formal Charge Formula
In the formal charge formula, F= V- (Lone - Bonds/2), does lone stand for lone pairs and unbonded electrons or just lone pairs.
- Sun Nov 08, 2020 2:13 pm
- Forum: Lewis Structures
- Topic: Lone Pairs Question
- Replies: 22
- Views: 1624
Re: Lone Pairs Question
Lone pair electrons are pairs that have not been bonded and naturally belong to said atom.
- Sun Nov 08, 2020 2:08 pm
- Forum: Octet Exceptions
- Topic: Octet rule
- Replies: 9
- Views: 578
Re: Octet rule
The octet rule is the concept that every atom wants to fill it's valence shells to achieve stability and lots of atoms do it by filling their shells, which can contain up to 8, with some special exceptions. As a result, the octet rule is a baseline for creating the structure of compounds by trying t...
- Fri Nov 06, 2020 3:03 pm
- Forum: Lewis Structures
- Topic: Lewis base
- Replies: 3
- Views: 137
Re: Lewis base
Lewis base is just something that donates electrons. I wouldn't necessarily say all negative charges mean it's a lewis base but it's a good way to start off if asked to find a lewis base.
- Fri Nov 06, 2020 2:54 pm
- Forum: Ionic & Covalent Bonds
- Topic: Polarity
- Replies: 9
- Views: 451
Re: Polarity
Polarity means that there is an unequal charge, an unequal distribution of a shared electron. Thus a polar covalent bond has polarity because of an unequally shared electron.
- Fri Nov 06, 2020 2:34 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm grades
- Replies: 19
- Views: 801
Re: Midterm grades
The grades are out!
- Sun Nov 01, 2020 11:27 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: d orbitals
- Replies: 17
- Views: 659
Re: d orbitals
5 d orbitals means that there are 5 orbitals in the d orbital. Each orbital holds 2 electrons.
- Sun Nov 01, 2020 11:24 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Ionization Energy Trend
- Replies: 6
- Views: 269
Re: Ionization Energy Trend
This is because the lower the molecule on a table, the bigger it is, thus it is easier to remove an electron from it's outer shell compared to a smaller molecule because the level of attraction is lower.
- Sun Nov 01, 2020 11:22 pm
- Forum: DeBroglie Equation
- Topic: Avogadro's Number
- Replies: 21
- Views: 1547
Re: Avogadro's Number
Avogadro's number represents the number of atoms in one mole. Thus, we should use it whenever a question asks for something regarding atoms.
- Sun Nov 01, 2020 11:21 pm
- Forum: Properties of Light
- Topic: Which model of light is atomic spectroscopy?
- Replies: 8
- Views: 504
Re: Which model of light is atomic spectroscopy?
The particle model is supported by atomic spectroscopy.
- Thu Oct 29, 2020 10:27 am
- Forum: *Particle in a Box
- Topic: Midterm 1
- Replies: 17
- Views: 1268
Re: Midterm 1
So we don't need to study 1.D?
- Sun Oct 25, 2020 2:45 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Advice for studying
- Replies: 92
- Views: 6490
Re: Advice for studying
I like to do practice problems and read the textbook. Practice problems is where I mostly retain information from.
- Sun Oct 25, 2020 2:42 am
- Forum: *Shrodinger Equation
- Topic: Schrodinger on MT
- Replies: 7
- Views: 407
Schrodinger on MT
Does anyone know if there will be Schrodinger related questions on MT1?
- Sun Oct 25, 2020 2:41 am
- Forum: Molarity, Solutions, Dilutions
- Topic: What does mmol stand for? [ENDORSED]
- Replies: 43
- Views: 5876
Re: What does mmol stand for? [ENDORSED]
Hi, mmol is a millimol, which is 1/1000th of a mol.
- Sun Oct 25, 2020 2:40 am
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Rounding when the last digit is 5
- Replies: 6
- Views: 648
Re: Rounding when the last digit is 5
For general problems, it is round up. But remember that when dealing with mols in empirical formula problems, we multiply to the nearest whole number.
- Sun Oct 25, 2020 2:36 am
- Forum: Properties of Light
- Topic: Constants
- Replies: 21
- Views: 580
Re: Constants
I like to use whatever is on the formula sheet to like 4 decimals.
- Sat Oct 17, 2020 2:21 am
- Forum: Properties of Light
- Topic: Energy Levels
- Replies: 11
- Views: 548
Re: Energy Levels
Hey Chesca, electrons don't technically jump/skip levels, they just have enough energy to go all the way to N=4. That means they'd have to have enough energy to make it through n=2 and n=3 before it could make it to n=4
- Fri Oct 16, 2020 8:15 pm
- Forum: Properties of Electrons
- Topic: Spectral Lines
- Replies: 7
- Views: 327
Re: Spectral Lines
I'm also a bit confused on this topic. Do we just take the difference between n-levels? For example, if an electron starts at the n=6 level and falls to the n=1 level, did it "pass" 5 spectral lines? And if an electron starts at the n=4 level and drops to the n=2 level, did it "pass&...
- Fri Oct 16, 2020 8:11 pm
- Forum: Properties of Light
- Topic: Wave particle duality
- Replies: 4
- Views: 130
Re: Wave particle duality
During Friday's lecture, Dr. Lavelle shows us the experiment where they shine light through an area with openings and light enters and appears where there isn't an opening. If the light was not a wave, the light would just shine straight instead of bending. Because the light was refracted, we are ab...
- Fri Oct 16, 2020 8:07 pm
- Forum: Properties of Light
- Topic: Does light lose energy the farther it travels?
- Replies: 8
- Views: 374
Re: Does light lose energy the farther it travels?
I searched it up and yes light does lose energy the further it travels. But for it to lose energy, it would have to travel super far. That's why we can see stars but aren't super bright.