Search found 111 matches
- Mon Mar 16, 2020 4:59 pm
- Forum: General Rate Laws
- Topic: rate laws
- Replies: 8
- Views: 691
Re: rate laws
The rate depends on the slowest step, just like the old phrase your only as strong as your weakest link.
- Mon Mar 16, 2020 4:58 pm
- Forum: *Enzyme Kinetics
- Topic: Catalysts and enthalpy
- Replies: 6
- Views: 2535
Re: Catalysts and enthalpy
Daniel Chen 2L wrote:One of the main things that a catalyst does is change the amount of work that a system does.
Does this have an impact on any of the properties of the other elements involved in the reaction?
- Mon Mar 16, 2020 4:57 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Catalyst
- Replies: 9
- Views: 612
Re: Catalyst
What is useful about catalysts? Do they lower activation energy or just progress the reaction so it overcomes the activation energy faster?
- Mon Mar 16, 2020 4:55 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: method
- Replies: 4
- Views: 450
Re: method
Is one way correct over another? Or are both fine to use where you will get the correct answer either way
- Mon Mar 16, 2020 4:54 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Activation energy
- Replies: 1
- Views: 228
Activation energy
Hey, just looking back on chem community. Does anyone know what the correct answer was on the final for the question that asked which reaction favored products? It was the last question and had 2 different graphs
- Mon Mar 09, 2020 2:42 pm
- Forum: Balancing Redox Reactions
- Topic: Values of Andode and Cathode
- Replies: 8
- Views: 599
Re: Values of Andode and Cathode
Why don't we flip the values of standard cell potential for the half reactions when we flip the reaction around to make it oxidation or reduction? I get how to do all the questions and stuff and how to do the calculations but this is something that has not clicked for me conceptually.
- Mon Mar 09, 2020 2:38 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Concentration Cells
- Replies: 3
- Views: 337
Re: Concentration Cells
As we saw on test 2, one of the main things that is tested on concentration cells is the fact that the standard cell potential is always zero. This is something that is worth being noted because it can be used to calculate the cell potential using the nernst equation. I wouldnt be surprised if it ca...
- Mon Mar 09, 2020 2:30 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Collision Theory and Transition State Theory
- Replies: 2
- Views: 393
Re: Collision Theory and Transition State Theory
If the rate of reaction only depends on how frequently the molecules collide with each other, then what is the point in differentiating zero, first, and second order reactions? My logic here is are these categorizations ways of labelling higher probability zones that they will collide more? Its hard...
- Mon Mar 09, 2020 2:27 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Arrhenius Equation Variables
- Replies: 4
- Views: 420
Re: Arrhenius Equation Variables
Does this mean that the Arrhenius equation needs to be used when a catalyst is used and there is a temp change or just if there is a temperature change at all? Also, how does this come into play with a biological example? i.e what does it look like in nature?
- Mon Mar 09, 2020 2:23 pm
- Forum: Zero Order Reactions
- Topic: Rate of Reaction Independent of [A]o
- Replies: 3
- Views: 283
Re: Rate of Reaction Independent of [A]o
I think all Dr Lavelle means by this is that a catalyst simply affects the speed of the reaction, not the concentrations of any elements. It reaches the same equilibrium/ end point concentrations, but goes about it in a faster manner
- Mon Mar 09, 2020 2:16 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: differential rate law to integrated rate law
- Replies: 3
- Views: 317
Re: differential rate law to integrated rate law
Integrated rate laws help you relate the rate law to time in a conceptual way. As shown in the email Lavelle recently sent, there are trends you can remember with the integrated rate laws that result in linear relationships with time
- Mon Mar 09, 2020 2:13 pm
- Forum: General Rate Laws
- Topic: general questions
- Replies: 3
- Views: 306
general questions
Just one quick question to make sure im studying the right information... In the rate law it is written where a is negative and b and c are positive... is this cause reactant concentration goes down while product concentration goes up?
- Sun Mar 01, 2020 11:55 pm
- Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
- Topic: Electrochemical Series
- Replies: 6
- Views: 558
Re: Electrochemical Series
What does the electrochemical series look like and how could it be tested?
- Sun Mar 01, 2020 11:54 pm
- Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
- Topic: rust
- Replies: 9
- Views: 754
Re: rust
Rust is a natural and pretty go to example of a redox reaction occurring in nature
- Sun Mar 01, 2020 11:51 pm
- Forum: Zero Order Reactions
- Topic: Difference
- Replies: 5
- Views: 438
Difference
What is the difference between zero, first and second order reactions?
- Sun Mar 01, 2020 11:50 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Study Advice
- Replies: 73
- Views: 7117
Re: Study Advice
I think you should definitely go to Lyndon's review sessions, catch up using only study tools like Khan Academy and just doing as many example problems as you can.Thats all I do and I've always done pretty well above the curve in this class
- Sun Mar 01, 2020 11:46 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: 6K3
- Replies: 3
- Views: 378
Re: 6K3
It is the oxidizing agent because it is the one that causes oxidation to happen. It ends up losing electrons by causing another one to gain electrons I think is my understanding of it
- Sun Mar 01, 2020 11:38 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Kinetics in Test 2?
- Replies: 13
- Views: 826
Re: Kinetics in Test 2?
So does that mean a heavier emphasis will be put on kinetics on the final or is it pretty well rounded?
- Sun Mar 01, 2020 11:37 pm
- Forum: General Rate Laws
- Topic: Preferred way to write reaction rate
- Replies: 5
- Views: 404
Re: Preferred way to write reaction rate
I think its just the more universal syntax but honestly nothing technically wrong with writing it the other way
- Wed Feb 26, 2020 11:46 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Question 14.35b Solution Manual Error?
- Replies: 2
- Views: 756
Re: Question 14.35b Solution Manual Error?
this is currently 6N.1 and I completely agree. Only 1 mole of electrons was transferred and for K I ended up getting e^4.67, or 106.8
- Sun Feb 23, 2020 11:45 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidation Numbers/States
- Replies: 8
- Views: 545
Re: Oxidation Numbers/States
Can someone explain again why Hydrogen is only capable of +1 ox state?
- Sun Feb 23, 2020 11:42 pm
- Forum: Balancing Redox Reactions
- Topic: Reduction?
- Replies: 13
- Views: 688
Re: Reduction?
Oxidation is usually exergonic because these reactions release energy, while reduction is usually endergonic because they usually require energy
- Sun Feb 23, 2020 11:40 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidation Number
- Replies: 3
- Views: 440
Re: Oxidation Number
It seems like the oxidation number is just the number of the charge of the ion that is usually formed of that element... is this correct? What is the point in making this distinction?
- Sun Feb 23, 2020 11:34 pm
- Forum: Balancing Redox Reactions
- Topic: Half reactions
- Replies: 17
- Views: 921
Re: Half reactions
No, I mean there are no other components at work and no matter what you will be able to balance all of these elements in a chemical reaction
- Sun Feb 23, 2020 11:31 pm
- Forum: Balancing Redox Reactions
- Topic: basic solution
- Replies: 3
- Views: 277
Re: basic solution
Balance oxygen by adding h2o, and you balance H+ by adding OH- and can usually play around with the numbers of H and O
- Sun Feb 16, 2020 9:18 pm
- Forum: Biological Examples (*DNA Structural Transitions, etc.)
- Topic: organic reactions, and environmental and biological examples
- Replies: 4
- Views: 764
Re: organic reactions, and environmental and biological examples
I don’t think any biological examples were covered distinctly, but I know lavelle incorporates real world examples in almost everything he mentions in lecture. As described before, he talked about organic molucules and natural reactions to demonstrate concepts like heat transfer and enthalpy
- Sun Feb 16, 2020 9:15 pm
- Forum: Van't Hoff Equation
- Topic: Hoff Equation
- Replies: 4
- Views: 199
Re: Hoff Equation
When did we go over the van hoff equation? Would this be something included on the next test or is it considered a part of the midterm material?
- Sun Feb 16, 2020 9:14 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: S = 0
- Replies: 21
- Views: 1191
Re: S = 0
Entropy is considered 0 in an isothermal reversible expansion reaction because entropy is a state function and ends in the same final state that it initially starts in.
- Sun Feb 16, 2020 9:09 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: How to incorporate 2nd Law of Thermo
- Replies: 3
- Views: 300
Re: How to incorporate 2nd Law of Thermo
Were no calculations required for the 2nd part? I understood the difference but I went about calculating the entropy different in each part because I knew one was reversible and the other was irreversible. How is it ok to not have to do another calculation when it is specified otherwise in different...
- Sun Feb 16, 2020 9:06 pm
- Forum: Calculating Work of Expansion
- Topic: Irreversible and Reversible Expanision
- Replies: 9
- Views: 695
Re: Irreversible and Reversible Expanision
How can you differentiate when to use -nRlnV2/V1 versus using -PV? I feel like I always get mixed up when I should use which equation. Any tips for knowing which one to use when?
- Sun Feb 09, 2020 11:11 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: combustion rxn
- Replies: 2
- Views: 197
Re: combustion rxn
What was the equation that Lavelle shared for calculating the change in mols for a combustion rxn? I dont remember exactly what you're referencing, but it is relatively straight forward to calculate the change in moles in a combustion reaction, just make sure you identify the right stoichiometric c...
- Sun Feb 09, 2020 11:07 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Isolated vs Closed [ENDORSED]
- Replies: 34
- Views: 4313
Re: Isolated vs Closed [ENDORSED]
WIll it always be specified if the item is insulated? Like are we expected to know certain things they reference are insulated? What if its hard to distinguish, or is it pretty clear whether or not its insulated?
- Sun Feb 09, 2020 11:03 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Temp vs Vol
- Replies: 3
- Views: 317
Temp vs Vol
One thing I am a bit hung up on while studying is why temperature is the only variable that can impact K, wheres vol and pressure changes only impact Q. Can someone break this down a little bit for me?
- Sun Feb 09, 2020 10:40 pm
- Forum: Van't Hoff Equation
- Topic: MIdterm
- Replies: 1
- Views: 206
MIdterm
Just to put it out there... do we have to be able to recognize the name of stuff like this? Can't you just derive these equations from simpler equations? Essentially im just a little confused why rearrange the equation and call it something else? I dont really see the purpose in this
- Sun Feb 09, 2020 10:34 pm
- Forum: Calculating Work of Expansion
- Topic: Isothermal
- Replies: 17
- Views: 795
Re: Isothermal
An isothermal process is a change of system where the temperature remains constant. Therefore, delta U would be equal to 0. I agree with this, for example, in pizza rolls review session they showed how when t = o, delta U = 0, therefore q = -w, which can come in useful knowing some of the types of ...
- Sun Feb 02, 2020 11:40 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Spontaneous vs. Energetically Favorable
- Replies: 3
- Views: 124
Re: Spontaneous vs. Energetically Favorable
So all energetically favorable reactions are spontaneous but not all spontaneous reactions are energetically favorable?
- Sun Feb 02, 2020 11:36 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: Third Law concept and problem types
- Replies: 4
- Views: 663
Re: Third Law concept and problem types
Yes, essentially the third law of thermodynamics is saying that at 0 degrees K, there is no vibrational, rotational, or translational entropy. The only possible entropy results from positional and residual. Thus, knowing the Boltzmann equation would come in handy when asked a question about the res...
- Sun Feb 02, 2020 11:30 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Week 4 lecture 3 calculating W question
- Replies: 2
- Views: 152
Re: Week 4 lecture 3 calculating W question
Does anyone know the point in microstates? I understood lavelle's discussion about this and the Boltzmann equation, but am having trouble understanding its applications. What is the point in making these distinctions?
- Sun Feb 02, 2020 10:48 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Isometric/Isochoric
- Replies: 11
- Views: 1404
Re: Isometric/Isochoric
What is the difference in isometric/osochoric? Is this something you think we will need to distinguish between on the midterm?
- Sun Feb 02, 2020 10:38 pm
- Forum: Calculating Work of Expansion
- Topic: work integral
- Replies: 6
- Views: 253
Re: work integral
Does anyone know if we are going to have to deal with inconsistent pressure? Are we expected to know how to use calculus in this class?
- Sun Jan 26, 2020 11:30 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: State Functions
- Replies: 4
- Views: 267
Re: State Functions
What does it mean to be an "internal system"? What is the distinction between types of systems?
- Sun Jan 26, 2020 11:28 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Kw Equations
- Replies: 10
- Views: 547
Re: Kw Equations
Pretty much this is a way of saying that pH + pOH = 14, but it is showing it in terms of the concentrations of [H30+] and [OH-]. I know these equations are usually always given on the equation sheet, so u can deduce subsequent equations from it.
- Sun Jan 26, 2020 11:25 pm
- Forum: Calculating Work of Expansion
- Topic: Reversible Process - infinitesimal changes
- Replies: 2
- Views: 122
Re: Reversible Process - infinitesimal changes
By saying it is infinitesimal changes, it is pretty much saying it is continuous. Pretty much it will slowly grow to the equilibrium point, not grow or shrink from point to point
- Sun Jan 26, 2020 11:23 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Predicting Molar Heat Capacity
- Replies: 3
- Views: 225
Re: Predicting Molar Heat Capacity
I believe Professor Lavelle said something about correlating with size. As the person above me said, complexity (higher mass) would probably mean it has a higher heat capacity in comparison to a simple compound with smaller mass. I think thats an accurate description. Pretty much I think if the com...
- Sun Jan 26, 2020 11:19 pm
- Forum: Phase Changes & Related Calculations
- Topic: Hess's Law
- Replies: 8
- Views: 207
Re: Hess's Law
Are there any other laws we have to remember pertaining to this? I know we went over 3 methods to this, but was this the only one given the name of a law?
- Sun Jan 19, 2020 7:46 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: When do we use the equilibrium sign?
- Replies: 7
- Views: 319
Re: When do we use the equilibrium sign?
Is it incorrect to use an equilibrium sign for strong acids/ bases?
- Sun Jan 19, 2020 7:45 pm
- Forum: Phase Changes & Related Calculations
- Topic: Autoprotolysis
- Replies: 15
- Views: 822
Re: Autoprotolysis
Lavelle talked about autoprotolysis a lot throughout lectures, so I wouldnt be surprised to see it show up on the test. Definitions above are good, i would say definitely know the equation and be able to explain it, which shouldnt be that hard if you have a rough understanding of what it is.
- Sun Jan 19, 2020 7:43 pm
- Forum: Phase Changes & Related Calculations
- Topic: lecture on 1/17
- Replies: 3
- Views: 270
Re: lecture on 1/17
As said above, Lavelle made it clear he was not going over new material. He ran through roughly 3 practice problems, and given that there is no class on monday this was a little review for the test in the coming week. Everything on equilibrium, acids/ bases, and ICE charts. Shouldn't be too bad but ...
- Sun Jan 19, 2020 7:41 pm
- Forum: Ideal Gases
- Topic: When to use this equation
- Replies: 14
- Views: 498
Re: When to use this equation
PV= nRT is an overarching equation that can be manipulated to define a lot of different laws within chemistry, but I think the main thing to notice is the effect temperature has on pressure and volume, and the inversely proportional relationship between p and v
- Sun Jan 19, 2020 7:39 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Shift Of Reaction
- Replies: 4
- Views: 243
Shift Of Reaction
What exactly does it mean for the reaction to shift left or to shift right? does it mean there is more products/reactants at equilibrium or it has to produce more in the direction to reach the same ratio at equilibrium again
- Sun Jan 12, 2020 10:42 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Chatelier's Principle
- Replies: 7
- Views: 241
Re: Chatelier's Principle
Chatelier's principle can be used to see which direction a reaction will proceed in response to a change in concentration or pressure. For example, if more reactants are added, therefore increasing concentration, Le Chatelier's principle tells us that the reaction will move forward in order to mini...
- Sun Jan 12, 2020 10:35 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Hw for next week
- Replies: 19
- Views: 810
Re: Hw for next week
From experience in 14A, the homework problems are really more for your understanding than for credit... just pick any problem relating to something we have gone over and he will accept it, it's more repition that will help you study and do better on the tests.
- Sun Jan 12, 2020 10:32 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Quadratic
- Replies: 2
- Views: 131
Re: Quadratic
It can get easy to get all your units mixed up, so make sure you are consistenly measuring Kc or Kp depending on the context
- Sun Jan 12, 2020 10:25 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Comparing K
- Replies: 9
- Views: 271
Re: Comparing K
When they say equilibrium lies to the right, it means that the forward reaction needs to carry out more before it reaches equlibrium, so more product needs to be formed
- Sun Jan 12, 2020 10:16 pm
- Forum: Ideal Gases
- Topic: Gas Laws
- Replies: 6
- Views: 186
Re: Gas Laws
On that note, do you guys think we need to know the isolated equations or is the ideal gas law the only thing we really need to remember?
- Sat Dec 07, 2019 10:11 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: -ido vs -o
- Replies: 5
- Views: 619
-ido vs -o
Why in some of the examples in the book (pg. 723) are anion ligands like CN- named cyanido, but then in other complexes named cyano? IF it is overall positively charged is it cyano and if the complex is overall negatively charged is it cyanido? Or is it just IUPAC confusion, and I should only use th...
- Sat Dec 07, 2019 9:53 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Practice Problem
- Replies: 2
- Views: 146
Practice Problem
FOr [Fe(NCS)(OH2)5]2+ how do you name iron at the end? I know you use ferrate for a negatively charged complex, but what do you use when it is positively charged?
- Sat Dec 07, 2019 9:02 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Why can CO3(2-) be a mono/bidentate ligand
- Replies: 3
- Views: 14360
Re: Why can CO3(2-) be a mono/bidentate ligand
Normally Carbonate is monodentate, because it only has 120 degrees between its Oxygens, so two oxygens cannot bind to the same metal. However, in some cases carbonate bonds to two different metals, making it bidentate. If it is bonding to two different metals, then isn't it not a coordination compo...
- Sat Dec 07, 2019 8:36 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: chelating ligands [ENDORSED]
- Replies: 51
- Views: 98260
Re: chelating ligands [ENDORSED]
Does anyone know what Dr. Lavelle means when he says:
atom with lone pair --- spacer atom --- spacer atom --- atom with lone pair
The only part i dont understand is spacer atom. What does spacer atom mean? Conceptually I see why C is the correct answer i am just unfamiliar with this terminology
atom with lone pair --- spacer atom --- spacer atom --- atom with lone pair
The only part i dont understand is spacer atom. What does spacer atom mean? Conceptually I see why C is the correct answer i am just unfamiliar with this terminology
- Sat Dec 07, 2019 8:31 pm
- Forum: Naming
- Topic: Abbreviations
- Replies: 6
- Views: 636
Abbreviations
On the exam, are we allowed to write oxalato as (ox) or do we have to say (C2O4)? Can we say (en) or do we have to say NH2CH2CH2NH2? Is one better than the other or are they interchangeable without losing points?
- Sat Dec 07, 2019 8:13 pm
- Forum: Naming
- Topic: Cation vs. Anion Transition Metal
- Replies: 3
- Views: 427
Cation vs. Anion Transition Metal
For example, on 9C.1, the transition metal is named cobalt for part B, but it is cobaltate for part C. How do you know which name to use? if the complex is anionic, do you name the transition metal + -ate or was this just a coincidence? Sorry, i dont remember what the rule for naming coord. compound...
- Sun Dec 01, 2019 11:54 pm
- Forum: Polyprotic Acids & Bases
- Topic: Spectator ions
- Replies: 3
- Views: 958
Re: Spectator ions
I know usually you can just determine spectator ions based on the ions that are not present in the reaction formula where you only write the ions that contribute to the actual reaction that occurs. Will we have to know how to identify them for the final/ write out these equations?
- Sun Dec 01, 2019 11:41 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Strong and Weak Acids
- Replies: 7
- Views: 545
Re: Strong and Weak Acids
Does anyone have a definite answer about if we need to know a list of strong acids and bases?
I remember we are only going to have to determine the pH of strong acids, but will we be asked to identify/ differentiate strong acids from weak acids
I remember we are only going to have to determine the pH of strong acids, but will we be asked to identify/ differentiate strong acids from weak acids
- Sun Dec 01, 2019 11:29 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Conjugate Seesaw
- Replies: 1
- Views: 73
Conjugate Seesaw
I understand Ka and Kb, but what is a conjugate seesaw? How will questions be brought up on this topic on the final?
- Sun Dec 01, 2019 11:21 pm
- Forum: *Stereochemistry
- Topic: What's a stereocenter?
- Replies: 5
- Views: 2246
Re: What's a stereocenter?
Is it only a stereocenter if all the atoms are different, or can 2 or more atoms be the same?
- Sun Dec 01, 2019 11:18 pm
- Forum: Industrial Examples
- Topic: For the Final
- Replies: 3
- Views: 823
Re: For the Final
What does an industrial example look like? Does industrial refer to the context of how the compound is applied, or something else? Trying to study and see if this is something i need to study more
- Sun Dec 01, 2019 11:09 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentate ligands
- Replies: 2
- Views: 133
Re: Polydentate ligands
Can someone explain to my what denticity measures? I have been following pretty closely but the language is getting really complex and I am getting really confused
- Sun Nov 24, 2019 5:21 pm
- Forum: Amphoteric Compounds
- Topic: Amphiprotic
- Replies: 11
- Views: 614
Re: Amphiprotic
Is H20 amphiprotic?
- Sun Nov 24, 2019 5:16 pm
- Forum: *Crystal Field Theory
- Topic: Crystal Field Theory
- Replies: 5
- Views: 1760
Re: Crystal Field Theory
Did Lavelle go over these theories in class? I don’t have any recollection of it and don’t wanna get hit by a curveball on the final. Where do they originate from, how would it be tested , etc.
- Sun Nov 24, 2019 5:06 pm
- Forum: Biological Examples
- Topic: Biological Applications to Know
- Replies: 3
- Views: 324
Re: Biological Applications to Know
Are the biological implications relevant for this class? I thought Lavelle just likes discussing the implications but it’s not actually necessary to know for the tests. I could be wrong but that was just my understanding up to this point
Re: Order
How do these topics come into question on the test? I don’t really understand the concept of naming these things and their application
- Sun Nov 24, 2019 4:59 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordinate covalent bonds
- Replies: 5
- Views: 345
Re: Coordinate covalent bonds
I missed this lecture. What is a coordination compound and what is a ligand? I am so confused it all sounded so complicated and I had to miss lecture so I feel really behind.
- Sun Nov 24, 2019 4:52 pm
- Forum: Lewis Acids & Bases
- Topic: lewis vs. bronsted
- Replies: 10
- Views: 543
Re: lewis vs. bronsted
Is donating a proton really the same as accepting an electron pair? What is the distinction and when does it come into play or are they exactly the same thing just interchangeable terms?
- Sun Nov 17, 2019 10:46 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Drawing molecules
- Replies: 12
- Views: 735
Re: Drawing molecules
Does it matter in what order we draw the atoms in the molecule? I forget what Dr. Lavelle said about structuring our drawing, although I know he said we need to know how to identify the molecules.
- Sun Nov 17, 2019 10:42 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Shapes
- Replies: 5
- Views: 297
Re: Shapes
Does anyone know the shape of a molecule that has 2 bonding pairs of electrons and 3 unbonding pairs of electrons? Just trying to think of different combos that didnt come up during lecture.
- Sun Nov 17, 2019 10:39 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: ion-ion intermolecular forces and ionic bonds
- Replies: 2
- Views: 188
Re: ion-ion intermolecular forces and ionic bonds
Yes, i think the terms are interchangeable. Pretty much the cation donates the electrons to the anion that holds all the electrons after and accepts the electrons.
- Sun Nov 17, 2019 8:12 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: Size and Electronegativity difference
- Replies: 3
- Views: 169
Re: Size and Electronegativity difference
Do you have any example questions of how this would be tested? I understand the concepts but dont see how it could be tested on a test
- Sun Nov 17, 2019 8:09 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: This Week Test
- Replies: 12
- Views: 769
Re: This Week Test
Have we gone over sigma and pi bonds yet? Do we have any more information about what exact material will be tested?
- Sun Nov 17, 2019 8:08 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: Boiling Points
- Replies: 7
- Views: 584
Re: Boiling Points
Essentially, does this mean that boiling points have a direct correlation to electronegativity? I would think that if an atom is more electronegative then there is a stronger bond and thus a higher boiling point.
- Sun Nov 10, 2019 10:33 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: pi bonds
- Replies: 3
- Views: 902
Re: pi bonds
What do sigma bonds look like versus pi ponds? Can you visually differentiate between the two or is it just a convention to describe them?
- Sun Nov 10, 2019 10:30 pm
- Forum: Hybridization
- Topic: Why is hybridization necessary?
- Replies: 3
- Views: 129
Re: Why is hybridization necessary?
What does hybridization look like? Is it just a way to describe how the electrons are arranged, or do the geometric e- distributions blend together and there a greater region where e- can be located?
- Sun Nov 10, 2019 10:26 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Writing e- Configurations
- Replies: 15
- Views: 687
Re: Writing e- Configurations
This is a good question- usually the shorthand convention is to use the last noble gas and then write out the configuration. However, when you first learn them, they usually want to see you write them out all the way. It isn't too difficult and pretty self explanatory.
- Sun Nov 10, 2019 10:24 pm
- Forum: Bond Lengths & Energies
- Topic: negative Ep
- Replies: 5
- Views: 398
Re: negative Ep
I think Ep is always negative because when 2 molecules interact, it is usually a likely reaction when Ep is negative. It is likely to happen and when they interact, energy is released, hence the negative sign.
- Sun Nov 10, 2019 10:18 pm
- Forum: Electronegativity
- Topic: Iodine
- Replies: 6
- Views: 662
Re: Iodine
Isn't there a greater shielding effect because iodine has a larger atomic radius than the other molecules? Im having trouble conceptualizing this becuase I would think F2 would have a stronger interaction because fluorine is the most electronegative atom and I thought they want the electrons the most.
- Sun Nov 03, 2019 11:58 pm
- Forum: Coordinate Covalent Bonds
- Topic: Electronegativity
- Replies: 12
- Views: 1744
Re: Electronegativity
Can someone explain how shielding works? I understand the concept as when there are more expanded shells of electrons the electrons are further away and the ones in the furthest shell are not pulled on as much, but is it the idea that the ones closer to the nucleus are "stealing" more of t...
- Sun Nov 03, 2019 11:55 pm
- Forum: Dipole Moments
- Topic: Induced dipole induced dipole interaction
- Replies: 2
- Views: 153
Induced dipole induced dipole interaction
If one dipole is induced and the induces another dipole, how does this interaction even begin? I am having trouble rationalizing this conceptually because I don't see how these molecules can induce a dipole when there is not something with a charge to incite it.
- Sun Nov 03, 2019 11:52 pm
- Forum: Resonance Structures
- Topic: Resonance structures
- Replies: 6
- Views: 528
Re: Resonance structures
Does it count as a resonance structure if it isn't the best way of arranging the compound? For example, we went over how to draw N2O at the review session and there were a bunch of different ways, but they weren't necessarily the best. Are resonance structure any variable form, or just variable form...
- Sun Nov 03, 2019 11:49 pm
- Forum: Electronegativity
- Topic: Comparing electronegativities
- Replies: 2
- Views: 130
Comparing electronegativities
How do you compare the electronegativities of elements across rows/ columns? Like how do you compare oxygen and chlorine when they are in equivalent positions of comparison? IS this something we would have to know how to explain on the midterm?
- Sun Nov 03, 2019 11:47 pm
- Forum: Resonance Structures
- Topic: Octet
- Replies: 13
- Views: 850
Re: Octet
What is the basis of the octet? LIke where does the logic come from and like how do we know some only want 8 when other elements want more or less? I know its the s2 and p6, but why does this mean Be, B can't have 8?
- Sun Oct 27, 2019 11:51 pm
- Forum: Octet Exceptions
- Topic: More than 8 valence e-
- Replies: 8
- Views: 419
More than 8 valence e-
Can someone explain why sulfur and those other atoms can take more than 8 electrons? I remember Dr. Lavelle had a good explanation in class but I am having trouble coming up with his explanation while trying to study.
- Sun Oct 27, 2019 11:48 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Test 1 [ENDORSED]
- Replies: 107
- Views: 21455
Re: Test 1 [ENDORSED]
I thought we were gonna be given partial credit, but my TA saw one tiny sign mistake in my problem and took away all points for that question (8 POINTS). When I asked him about it he said "you say wrong answer, you get no credit"... anyone else have this problem? Already made sure I switch...
- Sun Oct 27, 2019 11:45 pm
- Forum: Ionic & Covalent Bonds
- Topic: 4s before 3d
- Replies: 4
- Views: 197
Re: 4s before 3d
Nare Arakelian Dis 3E wrote:Why is 3d at a lower energy level than 4s?
3d is at a lower energy level than 4s because it is at the n = 3 level. At the n = 3 level, there is less energy then the 4s. Dr. Lavelle went over how to determine these quantum numbers in lecture and has shown the differences in energy at each n level.
- Sun Oct 27, 2019 11:32 pm
- Forum: Trends in The Periodic Table
- Topic: Electron Affinity
- Replies: 6
- Views: 328
Re: Electron Affinity
How can they measure the electron affinity? The way I think of it, I thought it was just described as how badly an atom wants to gain an electron. SO it takes less energy to add one as you move across the periodic table cause it gets closer to filling the octet. How can there be a negative energy?
- Sun Oct 27, 2019 11:13 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electrostatic potential energy
- Replies: 1
- Views: 132
Electrostatic potential energy
I unfortunately had to miss this lecture, but I was reviewing the notes from class and got a little confused when I was looking at this. this is E = q1q2/r. How does one determine the charge of each electron, and how can you experimentally determine the distance between these charges? Just curious b...
- Sun Oct 27, 2019 11:09 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Noble gas electron configurations
- Replies: 3
- Views: 199
Re: Noble gas electron configurations
I'm sure the textbook messed up. The first 2 electrons will occupy the 1s orbital, thus denoted as 1s2. It then follows the sequence of 1s2 2s2 2p6...
It doesn't really get messy in configurations until you reach period 4 where 4s fills before 3d.
It doesn't really get messy in configurations until you reach period 4 where 4s fills before 3d.
- Sun Oct 20, 2019 11:29 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Advice for studying
- Replies: 92
- Views: 7372
Re: Advice for studying
I think there's a lot of ways you can elaborate on learning in class. What I do is I review my notes, see what resources are online on Dr. Lavelle's website, and then sometimes I will look up topics online and read about them. I will go on youtube and find people that explain concepts more in depth ...
- Sun Oct 20, 2019 11:16 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: s-, p-, d- ,f- orbitals
- Replies: 10
- Views: 491
Re: s-, p-, d- ,f- orbitals
I have a general question. The electron density distributions were illustrated for s p and d orbitals. What exactly do these show? For example, p-orbitals show 2 lobes on either side of the nucleus. Can electrons be found anywhere within the lobe on either side, or is it just on the border of these ...
- Sun Oct 20, 2019 11:07 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Orbitals
- Replies: 4
- Views: 179
Re: Orbitals
What about when there are 2 electons in the s-orbital? Is it easier to remove 1 electron over the other depending on where they are orbiting around the nucleus, or is it just as easy to remove one electron as it is the other? Just wondering if this is relevant because I think it could be interesting...
- Sun Oct 20, 2019 11:01 pm
- Forum: DeBroglie Equation
- Topic: Linear Momentum
- Replies: 6
- Views: 235
Re: Linear Momentum
How does linear momentum relate to the De Broglie equation? I know the equation shows that wavelength = planck's constant / momentum, but what exactly does this mean? Does it just mean that an object with higher momentum will have a shorter wavelength? Cause it shows an inversely proportional relati...
- Sun Oct 20, 2019 10:25 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Spin up and spin down
- Replies: 13
- Views: 1160
Re: Spin up and spin down
Isn't spin up and spin down just relative? Couldn't it be that one electron spins to the left and one electron spins to the right? The only thing I am confused about is does this mean that the electrons are spinning in exactly 2 different directions? I'm just having trouble conceptualizing this conc...