Yes, the acronym ANOX REDCAT helps me remember. Anode=Oxidation and Reduction=Cathode
Hope this helps!
Search found 109 matches
- Mon Mar 15, 2021 6:30 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Anode and Cathode
- Replies: 25
- Views: 1213
- Mon Mar 15, 2021 6:29 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Forward vs. Reverse
- Replies: 22
- Views: 2011
Re: Forward vs. Reverse
Sometimes they will say left to right or right to left. Or they will tel you what the products or reactants are and you can work from that. Generally, I recommend doing practice problems because getting familiar with the wording is key in being efficient on an exam. Hope this helps!
- Mon Mar 15, 2021 6:27 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Value of N
- Replies: 24
- Views: 1083
Re: Value of N
Hey! I believe n is the number of moles of electrons transferred in a balanced redox reaction.
- Mon Mar 15, 2021 6:24 pm
- Forum: Student Social/Study Group
- Topic: Balance / Self Care Tips
- Replies: 62
- Views: 2897
Re: Balance / Self Care Tips
Schedule, schedule, and schedule! Be realistic when scheduling also include breaks in your tasks. Also stick to it! Even if you fall off for a couple of days, be nice to yourself and keep pushing!
- Mon Mar 15, 2021 6:22 pm
- Forum: General Rate Laws
- Topic: Factors Affecting k
- Replies: 83
- Views: 4542
Re: Factors Affecting k
Yes, K only changes if there is a change in temperature.
- Mon Mar 15, 2021 6:21 pm
- Forum: Student Social/Study Group
- Topic: Spring Break
- Replies: 53
- Views: 3168
Re: Spring Break
Lost of sun, sleep, and relaxation!
- Mon Mar 15, 2021 11:50 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Standard Cell Potential
- Replies: 3
- Views: 283
Re: Standard Cell Potential
Isolating each of the variables, Increasing T increases cell potential, decreasing it decreases cell potential. If nF is increased E of the cell decreases whereas if nF decreases Ecell increases.Same thing for ln(K) because ultimately it is a value that you are multiplying your fraction by.
- Mon Mar 15, 2021 11:42 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Differentiating between Kinetics and Thermodynamically Controlled
- Replies: 2
- Views: 427
Re: Differentiating between Kinetics and Thermodynamically Controlled
I believe the main this is just about reading the questions, often they give you a hint or word something differently when asking you to use kinetics vs thermo. I would just practice solving both and you will pick up on the jargon. Hope this helps!
- Mon Mar 15, 2021 11:34 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Q and K
- Replies: 16
- Views: 696
Re: Q and K
K is the equilibrium constant and Q is the constant of a system when not at equilibrium and the value of Q can tell us which way the reaction is proceeding etc. Basically Q is K when we have not yet found K. Hope this helps!
- Mon Mar 15, 2021 11:32 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Open Systems
- Replies: 3
- Views: 259
Re: Open Systems
I do not believe we do because there is so much going in and out of open systems.
- Mon Mar 15, 2021 11:30 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Entropy Factors
- Replies: 3
- Views: 313
Re: Entropy Factors
Because entropy is essentially the disorder of a system anything that causes the molecules to interact more with each other increases the entropy, so heating things up increases entropy, decreasing volume available for a gas will increase entropy, and solids and liquids have lower entropy levels tha...
- Mon Mar 15, 2021 11:25 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Is electromotive force the same as Ecellnaught?
- Replies: 3
- Views: 538
Re: Is electromotive force the same as Ecellnaught?
Yes I believe so!
- Mon Mar 15, 2021 11:24 am
- Forum: Phase Changes & Related Calculations
- Topic: Steam v. Water
- Replies: 4
- Views: 354
Re: Steam v. Water
I believe it is because when steam is 100 C its about to become air and that moisture mixes with your skin and absorbs faster at the same time that it goes down a phase change when it becomes water when it comes into contact with your skin. Whereas water at 100 degrees C is not at that level yet so ...
- Thu Mar 11, 2021 9:16 pm
- Forum: General Rate Laws
- Topic: Sapling Week 9/10 #2
- Replies: 13
- Views: 512
Re: Sapling Week 9/10 #2
Mitzy Garcia 1k wrote:Hi can someone explain what did I do wrong?
Also, can someone explain the step by step for this question? I keep getting stuck and I do not know where my calculations are wrong.
- Sun Feb 28, 2021 11:32 pm
- Forum: Student Social/Study Group
- Topic: Chem 14B Final
- Replies: 86
- Views: 5088
Re: Chem 14B Final
https://lavelle.chem.ucla.edu/wp-content/supporting-files/Chem14B/Chem14UA_PL_ALL.pdf If you can make it to any of these go to them! Also practice the worksheets they provide on your own, so that you can be able to do them faster over time and will have more time to check answers on the exam.
- Sun Feb 28, 2021 11:28 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Sapling Week 7/8 #12
- Replies: 5
- Views: 382
Re: Sapling Week 7/8 #12
Audrey Han 3L wrote:If you have all the number of electrons right and the standard potential, then make sure your answer is in kJ rather than joules
This! I realized that my answer was in joules, did the calculations [1J=0.001kJ] and it went straight in.
- Sun Feb 28, 2021 11:26 pm
- Forum: Student Social/Study Group
- Topic: Final
- Replies: 63
- Views: 3049
Re: Final
Since you did well on the first midterm, I would just focus on the concepts of the second midterm and also workshops are really helpful if you can make it to those! https://lavelle.chem.ucla.edu/wp-content/supporting-files/Chem14B/Chem14UA_PL_ALL.pdf
- Sun Feb 28, 2021 11:24 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing Reactions
- Replies: 22
- Views: 973
Re: Balancing Reactions
I do not believe you have to, as long as the reactants and products are on the correct sides and the charges are all there, you should be fine!
- Sun Feb 28, 2021 11:19 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Writing cell diagrams
- Replies: 5
- Views: 232
Re: Writing cell diagrams
It goes (Oxidation Anode half cell)|(Reaction Cathode half cell)
within each subgroup
Oxidation Anode(Reactant|Product)
Reaction Cathode(Reactant|Product)
Hope this helps!
within each subgroup
Oxidation Anode(Reactant|Product)
Reaction Cathode(Reactant|Product)
Hope this helps!
- Sun Feb 28, 2021 11:16 pm
- Forum: Balancing Redox Reactions
- Topic: Full molecule in half reactions?
- Replies: 8
- Views: 468
Re: Full molecule in half reactions?
Generally, you add electrons to the side that is more positive, but only do this is after accounting for H2O and balancing with H- on the other side. Then, find the LCM between each half reaction and cancel the e- and you should have a complete balanced reaction!
- Sun Feb 28, 2021 11:12 pm
- Forum: *Electrophiles
- Topic: Anode vs Cathode
- Replies: 16
- Views: 1380
Re: Anode vs Cathode
Mansi Solanki 3A wrote:I was taught to remember An Ox and a Red Cat, meaning that OXidation happens in the ANode and REDuction happens in the CAThode.
Same here! It is kind of unconventional but if you say it aloud a few times you will begin to remember it.
- Sun Feb 28, 2021 11:09 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Nernst Equations
- Replies: 7
- Views: 380
Re: Nernst Equations
The difference is Q and K! Use K when the problem says you are at equilibrium and then use Q when it does not.
- Sun Feb 28, 2021 11:07 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Sapling #7
- Replies: 4
- Views: 295
Re: Sapling #7
I believe it is mimicking the galvanic cell which has the salt bridge in the middle.
- Sun Feb 28, 2021 11:04 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Sapling week 7/8 question #17
- Replies: 5
- Views: 271
Re: Sapling week 7/8 question #17
I agree with Albert, the partial pressure of a gas can also be considered the "concentration" I think that is what they want us to take away from this problem.
- Sun Feb 28, 2021 10:14 pm
- Forum: Balancing Redox Reactions
- Topic: Sapling week 7/8 #3
- Replies: 3
- Views: 229
Sapling week 7/8 #3
Currently I have (MnO2) +(3Fe3+) +(2H2O)⇌(MnO4-) +(3Fe2+) +(4H+) and sapling said that "Your answer would be correct for acidic solution. Add OH− ions to both sides so that all the H+ ions combine with OH− to form water. Then, cancel an equal number of H2O molecules from each side." How wo...
- Sun Feb 21, 2021 7:08 pm
- Forum: Administrative Questions and Class Announcements
- Topic: FINAL EXAM QUESTIONS
- Replies: 40
- Views: 2293
Re: FINAL EXAM QUESTIONS
I think it will be similar to the midterms a couple will but majority will be new.
- Sun Feb 21, 2021 7:06 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: State function?
- Replies: 36
- Views: 1276
Re: State function?
It is a path function!
- Sun Feb 21, 2021 7:04 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Irreversible vs. Reversible Work Functions
- Replies: 6
- Views: 450
Re: Irreversible vs. Reversible Work Functions
Reversible- The system and its environment can return to exactly the states they were in by following the reverse path.
Irreversible- The system and its environment cannot return together to exactly the states that they were in.
Irreversible- The system and its environment cannot return together to exactly the states that they were in.
- Sun Feb 21, 2021 7:00 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Irreversible vs. Reversible Work Functions
- Replies: 6
- Views: 450
Re: Irreversible vs. Reversible Work Functions
Reversible- The system and its environment can return to exactly the states they were in by following the reverse path.
Irreversible- The system and its environment cannot return together to exactly the states that they were in.
Irreversible- The system and its environment cannot return together to exactly the states that they were in.
- Sun Feb 21, 2021 6:58 pm
- Forum: Calculating Work of Expansion
- Topic: Negative Work
- Replies: 30
- Views: 1172
Re: Negative Work
The reason why its negative is because we are not thinking about it in terms of physics where we think of work as leaving/entering the surroundings, we are concerned about the system.
- Sun Feb 21, 2021 6:56 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Open vs closed
- Replies: 31
- Views: 2773
Re: Open vs closed
Open systems - Things can move in and out and temperature can change and volume can change
Closed- Things cannot move in and out but temp can change and therefore volume etc
Isolated-(The most boring) Nothing is moving anywhere
Closed- Things cannot move in and out but temp can change and therefore volume etc
Isolated-(The most boring) Nothing is moving anywhere
- Sun Feb 21, 2021 6:52 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Cv and Cp
- Replies: 14
- Views: 2310
Re: Cv and Cp
Not sure if we did but this is the equation you can use ( Cp = Cv + R).
- Sun Feb 21, 2021 6:51 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Forward vs. Reverse
- Replies: 22
- Views: 2011
Re: Forward vs. Reverse
Often, they will say left to right or right to left. Or "the reaction proceeds in the forward/reverse direction."
- Sun Feb 21, 2021 6:49 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: 4J.5 Standard change in gibbs free energy
- Replies: 6
- Views: 350
Re: 4J.5 Standard change in gibbs free energy
I think they just want us to practice doing it other ways. Expose us to different ways of going about the same problem...
- Sun Feb 21, 2021 6:32 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Electrode vs. Anode
- Replies: 6
- Views: 300
Re: Electrode vs. Anode
Adding on, an anode is the electrode where electricity moves into or is absorbed. A cathode is the electrode where electricity is released or flows out of.
- Sun Feb 21, 2021 6:29 pm
- Forum: Ideal Gases
- Topic: Temperature
- Replies: 99
- Views: 5702
Re: Temperature
Yes 298K :)
- Sun Feb 21, 2021 6:28 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: R Constant
- Replies: 91
- Views: 5223
Re: R Constant
The units they give you usually give it away, but it you are in a time crunch I recommend just going with 8.3145 and then if you don't see your answer or if the numbers you are getting do not seem to make sense, use the other one.
- Sun Feb 21, 2021 6:26 pm
- Forum: Student Social/Study Group
- Topic: Fav Shows of the Moment
- Replies: 115
- Views: 26851
Re: Fav Shows of the Moment
I have been watching Night on Earth on Netflix if you're into Biology and want to watch something semi-relaxing I recommend!
- Sun Feb 21, 2021 6:24 pm
- Forum: Calculating Work of Expansion
- Topic: Value of Q
- Replies: 20
- Views: 904
Re: Value of Q
Q is what we call K or the equilibrium but Q is K but not at equilibrium and its used to identify which way the reaction will proceed.
- Sun Feb 21, 2021 6:18 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: H vs q
- Replies: 20
- Views: 850
Re: H vs q
305405193 wrote:Does any one have any good practice problems or YouTube videos for this topic to study for the final?
This video breaks it down a bit (https://youtu.be/6bi4_sAi0gE) hope this helps!
- Sun Feb 21, 2021 6:16 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: H vs q
- Replies: 20
- Views: 850
Re: H vs q
The way I think about is is delta H is the measure of heat at Constant Pressure but q is heat but not at any particular or constant pressure it just is. Outside of that I believe they will tell us when we are dealing with constant pressure so you can identify what formula to use.
- Sun Feb 21, 2021 6:09 pm
- Forum: Student Social/Study Group
- Topic: Fave food
- Replies: 266
- Views: 28734
Re: Fave food
Definitely Italian food but there's no Italian restaurants close to me :(
- Sun Feb 21, 2021 6:08 pm
- Forum: Balancing Redox Reactions
- Topic: Adding an Inert Conductor
- Replies: 3
- Views: 198
Re: Adding an Inert Conductor
Adding to what Carolina stated, an inert electrode is used for gas/ion electrode reactions. When you finish separating the equation into the cathode and anode reactions, check and see if there are only gases and ions present. If so, then use an inert electrode. If a solid is present, it becomes the ...
- Sun Feb 21, 2021 6:04 pm
- Forum: Balancing Redox Reactions
- Topic: Textbook Question 6K.3 Part D
- Replies: 1
- Views: 68
Re: Textbook Question 6K.3 Part D
I think its that way because that is the only way chlorine can be reduced/oxidized.
- Tue Feb 09, 2021 2:05 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: delta H vs Delta S
- Replies: 4
- Views: 249
Re: delta H vs Delta S
The best way that I can explain it is that delta S measures the randomness or chaos or movement in particles or compounds. H measures how much energy it contains. Due to the fact that we cannot measure H by itself, we measure the change in energy or change in heat. And changes in energy result in ch...
- Wed Feb 03, 2021 8:13 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Gibb Free Energy
- Replies: 3
- Views: 104
Re: Gibb Free Energy
Gibbs free energy (ΔG) equals the work exchanged by the system with its surroundings, minus the work of the pressure force. The best way to identify if a problem is asking you to use the equation is to see if the problem is dealing with energy work and pressure 9x out of 10 you can use Gibbs's equat...
- Wed Feb 03, 2021 8:11 pm
- Forum: Calculating Work of Expansion
- Topic: Negative Work
- Replies: 30
- Views: 1172
Re: Negative Work
The best way to sum it us is to remember that when work is done to the system you get a positive value and when a system does work you get a negative value. I think this is the opposite for physics because there you are looking at what is happening to the universe verses chem where we are looking at...
- Wed Feb 03, 2021 8:09 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: U and E
- Replies: 7
- Views: 171
Re: U and E
They are extensive properties!
- Mon Feb 01, 2021 6:01 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Memorizing molar entropies
- Replies: 15
- Views: 560
Re: Memorizing molar entropies
They should be given there are so many of them I doubt it. I feel like by now they would have told us which ones to remember if we did so I would not worry much about it.
- Thu Jan 28, 2021 9:41 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Textbook Problem 4E.9
- Replies: 3
- Views: 199
Re: Textbook Problem 4E.9
Does anyone remember what lecture this was mentioned in? I definitely need to revisit this concept. Thank you!
- Thu Jan 14, 2021 10:31 pm
- Forum: Ideal Gases
- Topic: Question 4 Sapling [ENDORSED]
- Replies: 8
- Views: 367
Question 4 Sapling [ENDORSED]
I am having quite a bit of trouble on this problem. I understand that I may have to set up an equilibrium constant expression and subsequent quadratic equation and solve for x, plug x back in to the equilibrium and add because the total pressure is the sum of the partial pressures but I am still stu...
- Sun Jan 10, 2021 9:18 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Pressure and Volume
- Replies: 16
- Views: 726
Re: Pressure and Volume
From my understanding they are inversely proportional. In other words as one increases the other decreases.
- Sun Jan 10, 2021 9:09 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K vs P
- Replies: 6
- Views: 359
Re: K vs P
Kc vs Kp Fro my understanding they both have to do with the equilibrium constant it is just that Kp is when you are dealing with pressure and gas and Kc is everything that does not fit into that category.
- Sun Jan 10, 2021 9:03 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Q and K relationship
- Replies: 12
- Views: 523
Re: Q and K relationship
From my understanding its best to imagine the relationship like this: <------|------------|-------------|-----------> -------Q ---------->K<------------Q If Q is less than K the reaction will shift to the right If Q is greater than K the reaction will shift left If Q=K the reaction is at equilibrium...
- Sun Jan 10, 2021 8:59 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Removing product
- Replies: 5
- Views: 375
Re: Removing product
When you remove the product you disturb the equilibrium and to counteract that the reaction will produce more products to "stabilize" the reaction again. I put reaction in quotes because a reaction is never truly stable the products and reactants are moving back and forth but at equal rate...
- Tue Jan 05, 2021 2:03 pm
- Forum: Ideal Gases
- Topic: Units of Temperature
- Replies: 82
- Views: 3353
Re: Units of Temperature
From what I have seen usually questions will provide us with the temperature in Celsius and we are expected to covert it to Kelvin.
- Sat Dec 12, 2020 10:34 am
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: 6B.1 Dilution and pH
- Replies: 3
- Views: 128
Re: 6B.1 Dilution and pH
The way that I approached the question was to assign values for the concentrations of HCl in solution, as long as the values met the criteria. I began with 1.0 M HCl in a 1L solution, which would yield 1.0 mol of HCl. Since the dilution reduced the HCl to 12% of its initial value, there would be 1....
- Sat Dec 12, 2020 12:55 am
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: 6B.1 Dilution and pH
- Replies: 3
- Views: 128
6B.1 Dilution and pH
The question asks: The molar concentration of HCl in hydrochloric acid is reduced to 12% of its initial value by dilution. What is the difference in the pH values of the two solutions? Can someone walk through how they would go about solving this question? What information do I need to know before I...
- Sat Dec 12, 2020 12:48 am
- Forum: Bronsted Acids & Bases
- Topic: Arrhenius acids and bases
- Replies: 2
- Views: 124
Re: Arrhenius acids and bases
I don't think we have to know Arrhenius acids and bases in-depth, especially because Dr. Lavelle didn't go over them. I think I remember from one of the UA review sessions that your definition would be enough in terms of just knowing what they are for the final. However, I think we don't really nee...
- Sat Dec 12, 2020 12:47 am
- Forum: Bronsted Acids & Bases
- Topic: experiments to know
- Replies: 1
- Views: 109
Re: experiments to know
Although these are not experiments I would add that you might want to be familiar with the ideas behind the DeBroglie equation, Heisenberg’s indeterminacy equation, and Bronsted and Lewis acids and bases. As far as experiments I believe you covered them all!
- Sat Dec 12, 2020 12:43 am
- Forum: Bronsted Acids & Bases
- Topic: Arrhenius acids and bases
- Replies: 2
- Views: 124
Arrhenius acids and bases
In addition to Lewis and Bronsted acids and bases do we have to study in depth about Arrhenius acids and bases? If so, is it enough to know that Arrhenius acids produce hydrogen ions and Arrhenius bases contain hydroxide ions?
- Thu Dec 10, 2020 10:07 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: pKa
- Replies: 3
- Views: 164
Re: pKa
I would also remember henderson hasselbalch equation and be able to use it to solve for Ka [A-] and [HA].
- Thu Dec 10, 2020 10:05 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Strong Acid Question (How to Derive)
- Replies: 3
- Views: 204
Re: Strong Acid Question (How to Derive)
Honestly I think its best to memorize them and the trends associated with them so you can identify them quickly on the exam. Acids usually start with H and some end in COOH. Strong bases that we are interested in contain OH and weak bases of our interest typically contain N.
- Thu Dec 10, 2020 9:18 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: pKa greater than pH
- Replies: 3
- Views: 201
pKa greater than pH
Someone wrote that when pKa is less than pH the acid will give off proton(s) and become negatively charged. So my question is does this mean that when pKa is greater than pH the acid gains protons and becomes positively charged? Or does not reaction happen at all because we are only looking at wheth...
- Tue Dec 08, 2020 10:00 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 5
- Views: 409
Re: Bond Angles
From my understanding, the angles mark the distance between one oxygen, back to the sodium molecule and back out to the next oxygen. I believe that the reason the distance does not add up to 360 degrees is because the oxygen molecules themselves occupy space within the "circle" of the comp...
- Wed Dec 02, 2020 5:34 pm
- Forum: Bronsted Acids & Bases
- Topic: Strength of Bronsted bases
- Replies: 1
- Views: 85
Strength of Bronsted bases
Because NH3 only has 1 lone pair of electrons it is considered a weak base so then would HBr be considered a strong base because it has 3 lone pairs? This topic is a little cloudy for me still...
- Tue Dec 01, 2020 9:11 pm
- Forum: Lewis Acids & Bases
- Topic: Lewis Acids and Bases
- Replies: 3
- Views: 171
Re: Lewis Acids and Bases
To add to what Akshata mentioned, I think it is also important to note that when a Brønsted acid dissociates, it increases the concentration of H+ ions in the solution; conversely, Brønsted bases dissociate by taking a proton Fromm the solvent (water) to generate [OH-]. It is also important to under...
- Mon Nov 30, 2020 9:29 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Textbook 2F 15
- Replies: 2
- Views: 67
Re: Textbook 2F 15
I believe the bond angle would increase. Based on the fact that in the sp hybrid, 1 of the 2 orbitals are s. Where as in the sp2 hybrid, 1 out of the 3 orbitals are s. Looking at them as fractions helps me with this concept.
- Mon Nov 30, 2020 8:59 pm
- Forum: Naming
- Topic: Tips for Naming Coordination Compounds
- Replies: 6
- Views: 236
Tips for Naming Coordination Compounds
I understand that when naming a coordination compound the cation comes first and then the ligands in the complex ion are next in alphabetical order, next is the metal atom or ion before the ligands in the chemical formula but I am still a tad bit confused. Does anyone have any tips that they utilize...
- Mon Nov 30, 2020 8:28 pm
- Forum: Biological Examples
- Topic: Biological Functions of Transition Metals
- Replies: 6
- Views: 294
Re: Biological Functions of Transition Metals
Just remember when looking at the first row that they each have unique biological functions and you should be fine.
- Mon Nov 30, 2020 8:25 pm
- Forum: Biological Examples
- Topic: Biological function of sigma and pi bonds
- Replies: 4
- Views: 193
Biological function of sigma and pi bonds
Is is sufficient enough to know that if an atom has one bond it is a sigma bond, and double and triple bonds contain sigma and pi bonds with double bonds having one each and triple bonds having one sigma and 2 pi bonds? I feel like that could be enough info but I just want to be sure I understand it...
- Wed Nov 25, 2020 8:52 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordinate Compounds
- Replies: 5
- Views: 251
Re: Coordinate Compounds
From my understanding, any molecule can be a coordination compound as long as it poses one or more metal centers that is bound to ligands or anything that donates electrons to the metal.
- Tue Nov 24, 2020 10:18 pm
- Forum: Student Social/Study Group
- Topic: Big Sad: Midterm 2
- Replies: 86
- Views: 5450
Re: Big Sad: Midterm 2
I understand exactly how you feel, the most troubling part is that I really practiced and studied for it too. Hopefully we all hit it out of the park on the final!
- Tue Nov 24, 2020 10:13 pm
- Forum: Dipole Moments
- Topic: 2E #29
- Replies: 7
- Views: 304
Re: 2E #29
From my understanding, dipole moments tell you how polar a bond is. So first find the most polar bond, or bond with the greatest difference in electronegativity.
- Tue Nov 24, 2020 10:06 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR Simulation
- Replies: 2
- Views: 303
Re: VSEPR Simulation
Thank you so much you are too kind!
- Tue Nov 24, 2020 10:04 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Important aspects of Radicals
- Replies: 6
- Views: 309
Re: Important aspects of Radicals
Another thing that is important to at-least be familiar with is that the formation of radicals sometimes involves the breaking of covalent bonds, and that process can requires significant amounts of energy.
- Tue Nov 24, 2020 9:52 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Ways to remember VSEPR
- Replies: 6
- Views: 214
Re: Ways to remember VSEPR
Honestly, what helps me is watching videos on the topic and writing. To memorize things I write using pencil and paper over and over again until it becomes muscle memory. Then, when its time for the exam you will have practiced it so many times you will be able to recreate the table in real time to ...
- Tue Nov 24, 2020 9:44 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Expanded Octets
- Replies: 9
- Views: 399
Re: Expanded Octets
Yes elements there can have an expanded octet. As long as the element meets the criteria of having d-orbitals and are located in the third period it can happen.
- Tue Nov 24, 2020 9:38 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 Point/vapor pressure
- Replies: 5
- Views: 409
Re: Boiling Point/vapor pressure
From my understanding, a high vapor pressure leads to a low boiling point.
- Tue Nov 24, 2020 9:36 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: H-bonding
- Replies: 5
- Views: 242
Re: H-bonding
You are correct in assuming that!
- Tue Nov 24, 2020 9:30 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: High Vapor Pressure, Solubility, Boiling Point
- Replies: 5
- Views: 335
Re: High Vapor Pressure, Solubility, Boiling Point
MCalcagnie_ 2H wrote:Clearly I didn't fully understand this concept haha thanks for clarifying everyone!
Literally! This forum helps me so much!
- Tue Nov 24, 2020 9:27 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: Hydrogen bonds and dipole-dipole
- Replies: 11
- Views: 1066
Re: Hydrogen bonds and dipole-dipole
Yes because the two are almost one in the same, a H bond is a type of dipole-dipole interaction!
- Tue Nov 24, 2020 9:23 pm
- Forum: Trends in The Periodic Table
- Topic: Textbook Question Focus 1.13
- Replies: 2
- Views: 168
Re: Textbook Question Focus 1.13
From my understanding, O has lower ionization enthalpy than N because N has a half-filled electron configuration. The lower ionization enthalpy of O is less than F because of the higher electronegativity and high effective nuclear charge of F. Hope this helps!
- Tue Nov 24, 2020 9:17 pm
- Forum: Bond Lengths & Energies
- Topic: textbook 2.27
- Replies: 2
- Views: 229
Re: textbook 2.27
I know that to find bond length we have to refer to the trends of ionic/atomic radii. I would just compare each atom and as long as things align with the rules of the trend you should be fine.
- Tue Nov 24, 2020 9:15 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Length vs Size of Molecule
- Replies: 14
- Views: 733
Re: Bond Length vs Size of Molecule
You are right larger atoms do have weaker bonds, it's just that boiling also weakens bonds. Sometimes the two relate to each other sometimes they do not it depends from situation to situation.
- Tue Nov 24, 2020 9:13 pm
- Forum: Bond Lengths & Energies
- Topic: Outline 3 - Covalent Bond Dissociation Energy
- Replies: 3
- Views: 300
Re: Outline 3 - Covalent Bond Dissociation Energy
You almost have it! Like it has already been said, covalent bond multiplicity has to do with bond order, atomic radius is the distance between atoms, and unpaired e- refers to the lone pairs of neighboring atoms. More unpaired electrons means that it is more likely that you are dealing with a weaker...
- Thu Nov 19, 2020 11:48 am
- Forum: Electronegativity
- Topic: Electronegativity versus atomic radius
- Replies: 8
- Views: 1134
Electronegativity versus atomic radius
I understand where we apply the principles of electronegativity but how does the trend of atomic radius relate to physical effects on the elements that we can use to study them?
- Sat Nov 14, 2020 4:14 pm
- Forum: Electronegativity
- Topic: Textbook 2D problem #7
- Replies: 3
- Views: 91
Re: Textbook 2D problem #7
I think Ba is correct because Ba has a lower electronegativity and therefore a lower covalent character so by association Ba is more soluble in water than Mg.
- Sat Nov 14, 2020 3:58 pm
- Forum: Electronegativity
- Topic: London Dispersion Forces
- Replies: 9
- Views: 690
Re: London Dispersion Forces
The biggest thing that helps me is looking at polarity. First, I knew that choice E was correct because there is no electronegativity difference between the Br atoms (only can have London dispersion forces). Next, I looked for hydrocarbons (choice A). They are not polar, and can only have London di...
- Sat Nov 14, 2020 3:50 pm
- Forum: Ionic & Covalent Bonds
- Topic: Electronegativity
- Replies: 18
- Views: 619
Re: Electronegativity
I noticed that too and honestly I suggest you use the trends on the periodic table to guide you those can point you in the general direction for the types of problems we are doing right now. There are other tables provided in the textbook but I doubt we will be able to use those on an exam. If anyon...
- Sun Nov 08, 2020 3:43 pm
- Forum: Ionic & Covalent Bonds
- Topic: Salts and molecules
- Replies: 4
- Views: 174
Re: Salts and molecules
Hello
Yes, because salts are help together by ionic bonds and contain cations and anions and molecules are held together by covalent bonds.
Yes, because salts are help together by ionic bonds and contain cations and anions and molecules are held together by covalent bonds.
- Thu Nov 05, 2020 8:29 pm
- Forum: SI Units, Unit Conversions
- Topic: Converting equations
- Replies: 16
- Views: 772
Re: Converting equations
I suggest being extremely through, writing out every step with its corresponding units, maybe even a sentence on the side describing what you did during that step before moving on.
- Thu Nov 05, 2020 8:22 pm
- Forum: Einstein Equation
- Topic: E=hv vs E=hf
- Replies: 15
- Views: 727
Re: E=hv vs E=hf
Use whatever one you prefer, they are interchangeable!
- Thu Nov 05, 2020 12:51 pm
- Forum: Electronegativity
- Topic: Periodic Table Trend
- Replies: 40
- Views: 2225
Re: Periodic Table Trend
Increases across a period and increases as you move up/decreases down a group.
- Thu Nov 05, 2020 12:49 pm
- Forum: Octet Exceptions
- Topic: Octet Rule
- Replies: 3
- Views: 180
Re: Octet Rule
I know that hydrogen, beryllium, and boron are electron deficient and because of that they have too few electrons to form an octet. There may be more exceptions though.
- Thu Nov 05, 2020 12:41 pm
- Forum: Ionic & Covalent Bonds
- Topic: Electron Affinity
- Replies: 5
- Views: 140
Re: Electron Affinity
Hope this helps!https://www.google.com/url?sa=i&url=https%3A%2F%2Fsciencenotes.org%2Fperiodic-table-trends%2F&psig=AOvVaw2v0EJsqqKxlzaPmHpmDnSu&ust=1604695153829000&source=images&cd=vfe&ved=0CAIQjRxqFwoTCOiVsreh7OwCFQAAAAAdAAAAABAD If you are a visual learner like me I hope y...
- Sun Nov 01, 2020 11:03 am
- 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!
- Sun Nov 01, 2020 11:03 am
- Forum: Properties of Light
- Topic: Midterm
- Replies: 6
- Views: 309
Re: Midterm
Partial points will be afforded but from what I have heard so far there will not be a curve on this exam or in the class in general.
- Sun Nov 01, 2020 10:53 am
- Forum: Student Social/Study Group
- Topic: Tips for Staying Focused
- Replies: 64
- Views: 3576
Re: Tips for Staying Focused
I suggest studying in intervals of 25 minutes and taking a 5 minute break before returning. This prevents burnout and gives you time to recenter yourself!
- Sun Nov 01, 2020 10:51 am
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 334105
Re: Final Jitters
Recently I found that having cup of tea or water by my side helps me. I suggest tea because the smell might calm you even if you do not stop for a drink.