Search found 106 matches
- Sat Mar 14, 2020 6:59 pm
- Forum: General Rate Laws
- Topic: Rate Law and Order
- Replies: 2
- Views: 219
Re: Rate Law and Order
the rate law tells you the overall rate of the reaction in terms of its reactants, this will include K. the rate order depends on the exponent on each reactant, which indicates the number of molecules of that substance that needs to collide. Molecularity refers to the number of species in an elemen...
- Sat Mar 14, 2020 6:01 pm
- Forum: General Rate Laws
- Topic: Rate Law and Order
- Replies: 2
- Views: 219
Rate Law and Order
Can someone explain the relationship between rate law, order, and molecularity?
- Sat Mar 14, 2020 5:53 pm
- Forum: General Rate Laws
- Topic: Stoichiometric Coefficients
- Replies: 3
- Views: 260
Stoichiometric Coefficients
If you have an equation that is A + A --> B, does that necessarily mean the rate law will be k=[A]^2?
Like does molecularity define the rate law?
Like does molecularity define the rate law?
- Sat Mar 14, 2020 5:42 pm
- Forum: General Rate Laws
- Topic: Elementary steps
- Replies: 3
- Views: 342
Elementary steps
How are non-elementary steps and elementary steps related?
- Sat Mar 14, 2020 4:47 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Redox from cell diagram
- Replies: 6
- Views: 444
Re: Redox from cell diagram
Usually the left most species are in the anode reaction and right most in the cathode.
- Sat Mar 14, 2020 4:45 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: frequency of reactions
- Replies: 2
- Views: 205
Re: frequency of reactions
josmit_1D wrote:why are third order reactions and higher less frequent?
The probability that three reactants will simultaneously collide with enough energy and the correct orientation is low.
- Sat Mar 14, 2020 2:10 pm
- Forum: General Rate Laws
- Topic: Hw 7A.13
- Replies: 9
- Views: 628
Re: Hw 7A.13
Can someone do a detailed walkthrough of how to do this problem? I keep getting the wrong answer :( 7A.13) In the reaction CH Br(aq) 1 OH2(aq) S CH OH(aq) 1 33 Br2(aq), when the OH2 concentration alone was doubled, the rate doubled; when the CH3Br concentration alone was increased by a factor of 1....
- Sat Mar 14, 2020 2:00 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Mechanisms
- Replies: 3
- Views: 285
Mechanisms
Hi, I'm just really confused about what reaction mechanisms are and why they are relevant?
- Sat Mar 14, 2020 1:59 pm
- Forum: General Rate Laws
- Topic: Overview
- Replies: 1
- Views: 146
Overview
Can someone do an overview about the relationship between elementary reactions, rate determining reactions, slow steps, and rate constants and orders?
- Sat Mar 14, 2020 1:58 pm
- Forum: General Rate Laws
- Topic: Example Problem
- Replies: 1
- Views: 184
Example Problem
Does someone have a good example from the book or something that asks about determining the rate-determining (slow) step?
- Sat Mar 14, 2020 1:53 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Nernst K vs Q
- Replies: 14
- Views: 887
Nernst K vs Q
How does the Nernst equation change based on if you use K or Q?
- Sat Mar 14, 2020 12:34 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Week 10 Review Question 6
- Replies: 1
- Views: 259
Re: Week 10 Review Question 6
^^^^ same question, isn't it the same delta G?
- Sat Mar 14, 2020 12:15 pm
- Forum: Bronsted Acids & Bases
- Topic: determining if a substance is protonated
- Replies: 1
- Views: 303
Re: determining if a substance is protonated
For this particular problem protonated is just a descriptor of the substance that remains. you can tell that the drug will remain in its protonated form because K is smaller than 1, which means the denominator has a higher concentration, which is the protonated form of the drug.
- Sat Mar 14, 2020 12:13 pm
- Forum: General Rate Laws
- Topic: Coefficients and Rate constants
- Replies: 2
- Views: 215
Coefficients and Rate constants
Hi, I'm a little confused about the relationship between stoichiometric coefficients and rate laws/constants?
- Sat Mar 14, 2020 12:12 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Midterm 6A
- Replies: 1
- Views: 227
Midterm 6A
Hi, I had a question about 6A on the midterm: Hydrochloric acid is a naturally-occurring component of the gastric acid produced in the digestive systems of most animal species, including humans. Consider this equation for the formation of HCl: 2H2(g) + 2Cl2(g) → 4 HCl(g) ∆Ho = –92.3 kJ Which stateme...
- Sat Mar 14, 2020 12:01 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Activation Energy and Energy released/absorbed
- Replies: 3
- Views: 270
Activation Energy and Energy released/absorbed
I was looking at the graphs for endothermic and exothermic reactions and I wanted clarification about whether in an endothermic reaction, the amount of activation energy includes the amount of energy that is absorbed in the reaction?
- Sat Mar 14, 2020 12:00 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Activation energy
- Replies: 3
- Views: 198
Re: Activation energy
If you're given a chart, you can tell because exothermic reactions have energy released and therefore reactants are higher than products. In an endothermic reaction, energy is absorbed and products are higher than reactants.
- Sat Mar 14, 2020 11:51 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Delta S
- Replies: 8
- Views: 671
Delta S
I'm a little confused about the meaning of delta s total versus delta s of the system/surroundings.
- Sat Mar 14, 2020 9:05 am
- Forum: Calculating Work of Expansion
- Topic: Increase/Decrease
- Replies: 6
- Views: 445
Increase/Decrease
Does expansion cause an increase or decrease in work? And why?
- Fri Mar 13, 2020 2:00 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Midterm 3B
- Replies: 2
- Views: 252
Midterm 3B
Can someone explain this question from the midterm? Which combination of solutions of HCl and NaOH would produce the largest ∆T? Ans _____B (A) 50 mL of 1 M HCl with 50 mL of 1 M NaOH (B) 50 mL of 2 M HCl with 50 mL of 2 M NaOH (C) 100 mL of 1 M HCl with 50 mL of 2 M NaOH (D) 100 mL of 1 M HCl with ...
- Fri Mar 13, 2020 1:34 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Pressure, Volume
- Replies: 5
- Views: 430
Re: Pressure, Volume
Sorry I meant a pressure change for one of the reactants or products.
- Fri Mar 13, 2020 1:25 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Pressure and Molarity
- Replies: 3
- Views: 292
Pressure and Molarity
If you are given an equation whose reactants and products are all in gaseous phases, and also given their molar concentrations, how do you calculate K?
- Fri Mar 13, 2020 1:24 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Pressure, Volume
- Replies: 5
- Views: 430
Pressure, Volume
Can someone explain the relationship between pressure, volume, and le chatelier? Like what if both sides of the equation have equal numbers of moles, how will a pressure change affect that?
- Tue Mar 10, 2020 8:36 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Coming up with Reaction steps
- Replies: 2
- Views: 192
Coming up with Reaction steps
Would we ever have to come up with reaction mechanisms or steps? Or just interpret them?
- Tue Mar 10, 2020 7:01 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Molecularity
- Replies: 4
- Views: 300
Re: Molecularity
does this mean molecularity corresponds with rate order?
- Tue Mar 10, 2020 1:27 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Molecularity
- Replies: 4
- Views: 300
Molecularity
When is molecularity relevant?
- Tue Mar 10, 2020 1:25 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Differences between Reaction Mechanisms
- Replies: 1
- Views: 93
Differences between Reaction Mechanisms
Hi, I'm just a little confused about how you can tell the differences between reaction mechanisms and when that is relevant?
- Mon Mar 09, 2020 4:10 pm
- Forum: Zero Order Reactions
- Topic: Zeroeth, First, Second meaning
- Replies: 6
- Views: 592
Zeroeth, First, Second meaning
Hi, I was working on HW question 7A.7 and it made me realize I don't really understand what it means if a reaction is first order? I know how to tell based on the graph etc, but what does it mean in terms of units and reaction speed etc?
- Thu Mar 05, 2020 1:16 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Platinum in cell diagrams
- Replies: 5
- Views: 307
Platinum in cell diagrams
How do you know when to include platinum in the cell diagram?
- Wed Mar 04, 2020 5:34 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: 6. 57 Ka squared
- Replies: 1
- Views: 117
6. 57 Ka squared
Hi, for 6.57 can someone explain why K is equal to Ka squared? Like why do you need to take the radical of K at the end to get Ka?
- Wed Mar 04, 2020 5:04 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: 6N 17: Cell doing work
- Replies: 3
- Views: 219
6N 17: Cell doing work
For 6N 17, I was wondering how you can tell the cell can do work? Is it because delta G and wmax are negative? for example, if you had gotten a positive value for delta G would the answer be that the cell cannot do work?
- Tue Mar 03, 2020 11:18 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Strongly Reducing vs Oxidizing
- Replies: 2
- Views: 173
Strongly Reducing vs Oxidizing
Hi, how is the strength of reducing agents determined?
- Tue Mar 03, 2020 12:27 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Cell Potential and Work/Free Energy
- Replies: 2
- Views: 239
Cell Potential and Work/Free Energy
Hi, can anyone explain the relationship between work and cell potential, and free energy and cell potential?
- Mon Mar 02, 2020 11:29 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: 6N. 15
- Replies: 1
- Views: 146
6N. 15
Hi, i'm a little confused as to how in 6N. 15 you know that the concentration of nickel ions is less in the half cell with hydroxide ion than the other cell?
- Mon Mar 02, 2020 11:06 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: 6N 9: anode v cathode
- Replies: 2
- Views: 170
6N 9: anode v cathode
Hi, for the question 6N.9, I don't understand why you can assume the tin electrode is the anode?
- Sun Mar 01, 2020 5:05 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6L Problems: oxidation and reduction
- Replies: 5
- Views: 398
Re: 6L Problems: oxidation and reduction
Siddiq 1E wrote:Thanks everyone but I actually need help writing it from the cell. I know what oxidation and reduction mean i just can't seem to discern which is which from the cell
For example, 6L. 3 gives just the elements.
- Sun Mar 01, 2020 5:04 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6L Problems: oxidation and reduction
- Replies: 5
- Views: 398
Re: 6L Problems: oxidation and reduction
Thanks everyone but I actually need help writing it from the cell. I know what oxidation and reduction mean i just can't seem to discern which is which from the cell
- Sun Mar 01, 2020 4:23 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6L Problems: oxidation and reduction
- Replies: 5
- Views: 398
6L Problems: oxidation and reduction
Hi, for the 6L problems that ask you to write the half reactions, how do you know which is being oxidized and which reduced?
- Tue Feb 25, 2020 3:16 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cathode vs Anode
- Replies: 6
- Views: 419
Cathode vs Anode
Hi, I'm a little confused about the 6L problems that ask you to write the half reactions --> how do you know which half reaction is the cathode and which is for the anode?
- Mon Feb 24, 2020 1:18 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Maximum Potential and Voltage
- Replies: 6
- Views: 409
Maximum Potential and Voltage
Can someone explain the relationship between maximum potential difference and voltage?
- Mon Feb 24, 2020 1:14 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Flow of Galvanic cell
- Replies: 3
- Views: 196
Flow of Galvanic cell
Hi, I'm not quite understanding how the flow of the cell works -- if electrons are travelling toward the cathode, how can cations also be travelling toward the cathode? Shouldn't it be that anions flow toward the cathode?
- Wed Feb 12, 2020 11:06 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Examples of systems
- Replies: 3
- Views: 83
Re: Examples of systems
You have to read the conditions of the question to be able to tell if it is open, closed, or isolated. Evaluate what is allowed to be exchanged with the surroundings. Can energy be exchanged, but matter cannot? This would be a closed system. Hope this helped! Thanks! Still a little confused... how ...
- Wed Feb 12, 2020 11:00 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Examples of systems
- Replies: 3
- Views: 83
Examples of systems
Can anyone tell me how to differentiate between open, closed, and isolated systems? Like how could you tell in the question which type of system it is?
- Tue Feb 11, 2020 1:24 pm
- Forum: Phase Changes & Related Calculations
- Topic: 4.5 Time
- Replies: 1
- Views: 123
4.5 Time
I'm a little confused as to why for 4.5 in the hw 10 hours is divided by 0.5 hours?
- Mon Feb 10, 2020 6:23 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Pizza Rolls 7
- Replies: 1
- Views: 93
Pizza Rolls 7
Can anyone explain where the delta n = 2 and delta n =1/2 comes from in the solution to number 7 of pizza rolls?
- Sat Feb 08, 2020 8:40 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Boltzmann Equation
- Replies: 3
- Views: 80
Boltzmann Equation
Can someone explain when the boltzmann equation is more useful than the other methods to calculate entropy?
- Tue Jan 21, 2020 1:54 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 6b3
- Replies: 1
- Views: 62
6b3
Hi, for the answer for 6B3, i was confused as to why on part A, the solutions manual did not convert 0.025 to moles per 250 milliliters?
- Tue Jan 21, 2020 1:33 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: 5J 5: increase in pressure
- Replies: 4
- Views: 139
5J 5: increase in pressure
So I understand the basic set up of the question, but I am confused on the answer for D. To me it seems like there's more moles on the left side so the reaction would favor the products?? I'm also confused about B :(
- Sat Dec 07, 2019 6:36 pm
- Forum: Hybridization
- Topic: Ammonia
- Replies: 4
- Views: 278
Re: Ammonia
Since there are 5 valence electrons, when you hybridize the orbitals to get sp3, there will be one valence with a lone pair and three orbitals with one electron in it (that's the five valence electrons you're asking about). I hope this answers your question! :) It does thank you so much!! Does this...
- Sat Dec 07, 2019 1:47 pm
- Forum: Hybridization
- Topic: Ammonia
- Replies: 4
- Views: 278
Re: Ammonia
Perhaps I wasn't clear. I know why it has sp3 hybridized orbitals but my question has to do with the amount of electrons in the sp3 orbital.
- Sat Dec 07, 2019 11:16 am
- Forum: Hybridization
- Topic: Ammonia
- Replies: 4
- Views: 278
Ammonia
So I know electrons prefer to occupy unhybridized orbitals rather than spin pair in a hybridized orbital, so I'm confused as to why NH3 is hybridized sp3 when it has 5 electrons? It has a lone pair but I don't understand how that plays into it.
- Wed Dec 04, 2019 7:04 pm
- Forum: Hybridization
- Topic: Hybridized orbitals
- Replies: 2
- Views: 117
Hybridized orbitals
when you write hybridized orbitals out, like when you're labelling atoms in a molecule, do you include a "2p" for example, if there's a pi bond? For example NO2, when you write the hybridized orbitals for nitrogen, do you put sp2 2p or just sp2? And do you include the energy level, 2?
- Wed Dec 04, 2019 6:53 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: - Dentate
- Replies: 1
- Views: 65
- Dentate
How can you tell how to classify ligands as mono, bi, tri, dentate?
- Wed Dec 04, 2019 3:54 pm
- Forum: Bronsted Acids & Bases
- Topic: 6A.17b
- Replies: 5
- Views: 330
Re: 6A.17b
Wait if it's an acidic oxide why is the answer basic...? Am i missing something or getting caught up in the wordiness?
- Wed Dec 04, 2019 3:48 pm
- Forum: Amphoteric Compounds
- Topic: Amphoteric Oxides
- Replies: 2
- Views: 172
Amphoteric Oxides
What are examples of amphoteric oxides, and what should we know about them?
- Wed Dec 04, 2019 9:27 am
- Forum: Biological Examples
- Topic: Cisplatin
- Replies: 6
- Views: 413
Cisplatin
I'm a little bit confused as to how the structure of cisplatin allows it to act as a chemotherapeutic agent.
- Wed Dec 04, 2019 9:26 am
- Forum: Properties of Light
- Topic: Light as a Wave
- Replies: 8
- Views: 545
Light as a Wave
When does light act as a wave?
- Tue Dec 03, 2019 9:50 pm
- Forum: Photoelectric Effect
- Topic: Midterm Question
- Replies: 4
- Views: 268
Re: Midterm Question
Thank you all for the replies -- I get why it goes across now, but I still don't understand why it goes straight up?
- Mon Dec 02, 2019 6:17 pm
- Forum: Lewis Acids & Bases
- Topic: Electron Donating/Accepting
- Replies: 2
- Views: 200
Re: Electron Donating/Accepting
We talked about Lewis acids and bases mostly in the context of coordination compounds, so I'll explain it in that context too. In a coordination compound, the Lewis acid (electron pair acceptor) is the positively charged transition metal. Notice that even though it is positively charged, !! it does...
- Mon Dec 02, 2019 5:25 pm
- Forum: Lewis Acids & Bases
- Topic: Electron Donating/Accepting
- Replies: 2
- Views: 200
Electron Donating/Accepting
I'm confused about how lewis acids accept electrons? And how do lewis bases donate electron pairs? I get Bronsted acids and bases do proton accepting/donating through Hydrogens but I don't know how lewis acids/bases work. Thanks in advance :)
- Sun Dec 01, 2019 9:36 pm
- Forum: Bronsted Acids & Bases
- Topic: Bronsted vs Lewis Acid/Base
- Replies: 5
- Views: 164
Re: Bronsted vs Lewis Acid/Base
Ahhh I understand now!! Thank you everyone :)
- Mon Nov 25, 2019 11:23 am
- Forum: Hybridization
- Topic: When does hybridization occur?
- Replies: 7
- Views: 411
Re: When does hybridization occur?
Same as above!! Does that mean we can determine hybridization in every molecule??
- Mon Nov 25, 2019 11:21 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Determining Polarity
- Replies: 10
- Views: 531
Determining Polarity
Hi I'm having trouble still picturing the shapes in 3D, which is problematic because that has a lot to do with polarity of a molecule. Does anyone have any advice on how to solve this? I know mostly you have to determine polarity on a case by case basis but is there any way to have a key like this s...
- Mon Nov 25, 2019 11:18 am
- Forum: Bronsted Acids & Bases
- Topic: Bronsted vs Lewis Acid/Base
- Replies: 5
- Views: 164
Re: Bronsted vs Lewis Acid/Base
Thanks everyone. The other thing that's confusing to me is how does an atom donate a proton? I thought interactions between atoms were all through electrons.
- Mon Nov 25, 2019 11:17 am
- Forum: Photoelectric Effect
- Topic: Midterm Question
- Replies: 4
- Views: 268
Midterm Question
Hi, I still don't understand why the correct answer for the graph on the midterm isn't just linear.
- Mon Nov 25, 2019 11:15 am
- 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 Bonding Sites
- Replies: 2
- Views: 139
Hydrogen Bonding Sites
Hi, how can we determine the number of hydrogen bonding sites between two molecules?
- Mon Nov 25, 2019 11:12 am
- Forum: Bronsted Acids & Bases
- Topic: Bronsted vs Lewis Acid/Base
- Replies: 5
- Views: 164
Bronsted vs Lewis Acid/Base
Hi, I'm a little confused about the difference between bronsted and lewis acid/bases. I know the definitions but I'm wondering practically is there a difference? Is one a more correct depiction of acids and bases than the other? Thanks in advance.
- Mon Nov 25, 2019 11:10 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Formation of Coordination Compound
- Replies: 1
- Views: 136
Re: Formation of Coordination Compound
I think that in these cases the octet rule isn't so strictly enforced.
- Mon Nov 18, 2019 11:30 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: dissociation energy
- Replies: 2
- Views: 143
Re: dissociation energy
Dissociation energy will be larger(stronger) for a stronger bond.
- Sat Nov 16, 2019 4:29 pm
- Forum: Ionic & Covalent Bonds
- Topic: Character of Bonds
- Replies: 7
- Views: 468
Character of Bonds
How do we determine ionic or covalent character of bonds? Is it just electronegativity?
- Sat Nov 16, 2019 4:26 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: 9
- Views: 560
Re: Boiling Points
All IMF's contribute to boiling points. Stronger IMF's will result in higher boiling points.
- Sat Nov 16, 2019 4:25 pm
- Forum: Dipole Moments
- Topic: Cancelling dipole moments
- Replies: 11
- Views: 4521
Re: Cancelling dipole moments
I have the same problem... I usually draw it out but if it's too complicated I don't know what to do :(
- Sat Nov 16, 2019 4:23 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Strengths
- Replies: 3
- Views: 246
Re: Bond Strengths
I could be wrong but I interpreted this to mean that when atoms with similar atomic radii are bonded to the same atom they will have the same bond strength
- Sat Nov 16, 2019 4:19 pm
- Forum: Bond Lengths & Energies
- Topic: Dissociation Energy
- Replies: 9
- Views: 340
Re: Dissociation Energy
How can we calculate dissociation energy? Will we need to?
- Sat Nov 16, 2019 4:05 pm
- Forum: Dipole Moments
- Topic: 2E.2 Determing strongest dipole moment between resonance structures
- Replies: 2
- Views: 174
Re: 2E.2 Determing strongest dipole moment between resonance structures
I don't know if it necessarily has to do with which is more or less polar, but I think it has to do with the direction and cancellation of dipoles. There will be a stronger dipole moment in the structure where dipoles are in the same direction.
- Sat Nov 16, 2019 4:00 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: Does dipole-dipole force only exist among polar molecules?
- Replies: 9
- Views: 1191
Re: Does dipole-dipole force only exist among polar molecules?
Will we need to draw dipole moments on the exam?
- Tue Nov 12, 2019 4:10 pm
- Forum: Bond Lengths & Energies
- Topic: Boiling and Melting points
- Replies: 8
- Views: 372
Re: Boiling and Melting points
I think it would be helpful to know generally which type of bond creates higher or lower boiling/melting points.
- Tue Nov 12, 2019 4:06 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: central atoms
- Replies: 7
- Views: 306
Re: central atoms
Atoms with higher electronegativity tend not to be central atoms. They are on the outside so they have more electrons to themselves
- Tue Nov 12, 2019 4:02 pm
- Forum: Lewis Structures
- Topic: Exceptions
- Replies: 5
- Views: 154
Re: Exceptions
I think it is elements that have electrons in 2p state or higher.
- Mon Nov 11, 2019 6:56 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 bonding
- Replies: 5
- Views: 231
Re: Hydrogen bonding
I think N,O, and F are the strongest hydrogen bonds so they are specially named as such. Hydrogen can have IMF with other elements but these forces are not as strong.
- Sun Nov 03, 2019 5:59 pm
- Forum: Photoelectric Effect
- Topic: Energy of electron
- Replies: 2
- Views: 180
Re: Energy of electron
Yes! The equation E=hv can be applied because it corresponds to the energy of one photon. The de Broglie equation is used for the energy of one particle/atom.
- Sun Nov 03, 2019 5:52 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: What are the octet exceptions?
- Replies: 11
- Views: 467
Re: What are the octet exceptions?
Past the 2p level, atoms can contain more electrons.
- Sun Nov 03, 2019 5:51 pm
- Forum: Lewis Structures
- Topic: Dino Nuggets - 12C
- Replies: 3
- Views: 273
Re: Dino Nuggets - 12C
Looking at the formal charge and electronegativity, oxygen would rather have a negative formal charge than nitrogen because oxygen is more electronegative.
- Sun Nov 03, 2019 5:48 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: When would 3d orbital be filled before the 4s orbital?
- Replies: 8
- Views: 450
Re: When would 3d orbital be filled before the 4s orbital?
After the 4s orbital is occupied AND electrons enter the 3d state, THEN the 3d state is lower in energy than 4s, so it would be written first.
- Sun Nov 03, 2019 5:21 pm
- Forum: Resonance Structures
- Topic: Resonance
- Replies: 3
- Views: 178
Re: Resonance
For resonance, if it asks whether the hybrid structure is equally inclusive of all the possible resonance structures, it's an equal structure if all the formal charges in every structure are equal. If the formal charges are different, the structure with the most favorable charge will most influence ...
- Sun Oct 27, 2019 7:22 pm
- Forum: Ionic & Covalent Bonds
- Topic: 2A 19
- Replies: 2
- Views: 103
Re: 2A 19
In this case I think the 3d shell is lower in energy than the 4s shell.
- Sun Oct 27, 2019 7:21 pm
- Forum: Lewis Structures
- Topic: 2A.19
- Replies: 3
- Views: 117
Re: 2A.19
So the number of unpaired electrons just means the number of valence electrons. You can draw a lewis dot structure to visualize this
- Sun Oct 27, 2019 7:16 pm
- Forum: Lewis Structures
- Topic: 2B.7
- Replies: 4
- Views: 107
Re: 2B.7
Is it just using the known valence electrons for Oxygen and Chlorine and subtracting those values from the total electrons? Thanks in advance!
- Sun Oct 27, 2019 7:16 pm
- Forum: Lewis Structures
- Topic: 2B.7
- Replies: 4
- Views: 107
Re: 2B.7
So for this problem, we know the other elements are Oxygen and Chlorine, so which electrons do we count for the central atom?
- Sun Oct 27, 2019 6:44 pm
- Forum: Trends in The Periodic Table
- Topic: Zeff and ionization energy
- Replies: 4
- Views: 297
Re: Zeff and ionization energy
Doesn't nuclear charge decrease down a group? I'm confused as to why the trend doesn't follow the ionization energy trend exactly.
- Sun Oct 27, 2019 5:09 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Effective Nuclear Charge
- Replies: 4
- Views: 236
Re: Effective Nuclear Charge
What is the relationship between effective nuclear charge and ionization energy?
- Sun Oct 20, 2019 1:56 pm
- Forum: Properties of Electrons
- Topic: Equations for Test
- Replies: 9
- Views: 290
Re: Equations for Test
For the photoelectric effect, will the calculations only involve kinetic energy?
- Sun Oct 20, 2019 1:54 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Special Case Electron Configuration
- Replies: 2
- Views: 144
Re: Special Case Electron Configuration
So for these we would have to just memorize the exceptions to the rules, correct?
- Sun Oct 20, 2019 1:52 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Balmer vs. Lyman Series
- Replies: 4
- Views: 226
Re: Balmer vs. Lyman Series
Will the lowest energy level always correspond to quote unquote "where the electron ends up" ? What if the electron jumps up energy levels?
- Sun Oct 20, 2019 1:50 pm
- Forum: DeBroglie Equation
- Topic: 1B.7 HW prob
- Replies: 3
- Views: 126
Re: 1B.7 HW prob
For E=hv, this equation gives the energy of one photon. Every time you use this equation, the energy given is per photon.
- Sun Oct 20, 2019 1:07 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Structure of electrons
- Replies: 5
- Views: 164
Re: Structure of electrons
So I figured this out regarding D11: I think of orbitals as the spots for the electrons. So the s orbital has one spot (fitting two electrons with different spins), the p orbital has 3 spots (6 electrons), d has 5 spots, and f has 7. The subshells are each letter themselves. Hope this helps!
- Sat Oct 12, 2019 3:29 pm
- Forum: Properties of Light
- Topic: Frequency vs. Wavelength
- Replies: 15
- Views: 651
Re: Frequency vs. Wavelength
Frequency is measured in Hertz, and wavelength is measured in meters.
- Sat Oct 12, 2019 3:24 pm
- Forum: Student Social/Study Group
- Topic: Turning in Extra HW problems
- Replies: 10
- Views: 389
Re: Turning in Extra HW problems
What I've been doing so far is doing all (most? some? (; ) of the homework problems and then copying 5 to give the TA. I don't think more counts as EC. If you have questions on the others, though, I'd definitely ask your TA or someone at peer learning sessions.
- Sat Oct 12, 2019 11:34 am
- Forum: Properties of Light
- Topic: Shorter Wavelength
- Replies: 3
- Views: 169
Re: Shorter Wavelength
The one to one relationship between photons and electrons accounts for this. By looking at the equation we can determine that a shorter wavelength means higher frequency and thus more energy per photon, allowing it to eject one electron. It doesn't matter if the overall energy is more; if the energy...
- Sat Oct 12, 2019 11:30 am
- Forum: Significant Figures
- Topic: Balancing Equations
- Replies: 4
- Views: 364
Re: Balancing Equations
For me it helps to write notes on the side of how much of each atom you have. This helps me keep track of each atom number and reduces confusion. If I am really confused and feeling lost I start from the beginning again and often I've missed a small detail. Honestly the best thing to do is just prac...