Search found 97 matches
- Sat Mar 17, 2018 11:45 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: 14.93
- Replies: 1
- Views: 470
14.93
Can anyone explain why does reduction take place at higher concentration?
- Sat Mar 17, 2018 9:23 am
- Forum: Balancing Redox Reactions
- Topic: reducing and oxidizing agents
- Replies: 2
- Views: 434
Re: reducing and oxidizing agents
Think this way, two half-reactions, one reduced and the other oxidized. Reducing agents themselves are oxidized because their electrons are taken away so to facilitate the other reduced reaction.
- Sat Mar 17, 2018 9:08 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: 15.109
- Replies: 2
- Views: 428
Re: 15.109
I see. I thought their values are already determined so I could just plug in and find out, but why can't I do that?
- Fri Mar 16, 2018 4:06 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: 15.109
- Replies: 2
- Views: 428
15.109
Hi,I don't understand how there's a manipulation done on the arrhenius equation.
- Fri Mar 16, 2018 8:35 am
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Will electrolysis be tested [ENDORSED]
- Replies: 2
- Views: 453
- Thu Mar 15, 2018 7:00 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Will electrolysis be tested [ENDORSED]
- Replies: 2
- Views: 453
Will electrolysis be tested [ENDORSED]
There are HW problems included but on the syllabus I don't see there's a requirement to know about electrolysis in terms of knowing how to calculate.
- Thu Mar 15, 2018 6:49 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: question from syllabus [ENDORSED]
- Replies: 1
- Views: 397
question from syllabus [ENDORSED]
"Predict the effect of changes in concentration of reactants and products on the cell potential." What is that referring to? the ln K=nFE/RT?
- Wed Mar 14, 2018 7:01 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: HW 14.55 [ENDORSED]
- Replies: 1
- Views: 333
HW 14.55 [ENDORSED]
I know there are other posts about this question. I read them and still don't understand in some aspects. I know that for electrolytic cell, the cathode is negative and anode is positive, and so Ni and SO4 are competing with water for to be in either cathode or anode? (I am not sure if I understand ...
- Wed Mar 14, 2018 4:51 pm
- Forum: Balancing Redox Reactions
- Topic: Winter 2013 final Q4
- Replies: 9
- Views: 1183
Re: Winter 2013 final Q4
Since it is basic reaction, you have to get two half equations to find out the electrons, which is n.
- Wed Mar 14, 2018 12:32 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: 15.101 C and D [ENDORSED]
- Replies: 1
- Views: 289
15.101 C and D [ENDORSED]
I am not sure how do the last two. Is there part of the text I can refer to? Thanks.
- Wed Mar 14, 2018 12:26 pm
- Forum: *Enzyme Kinetics
- Topic: Catalyst and equilibrium constant
- Replies: 3
- Views: 2864
Catalyst and equilibrium constant
On chapter 15.14 it says "a catalyst has no effect on the equilibrium composition. both forward and reverse reactions are accelerated on the catalyzed path,leaving th equilibrium constant unchanged." Does it mean the catalyst has no effect on K?
- Tue Mar 13, 2018 5:03 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: HW 15.95 e
- Replies: 2
- Views: 419
Re: HW 15.95 e
Enzymes affect the rate of the reaction in both the forward and reverse directions; the reaction proceeds faster because less energy is required for molecules to react when they collide. Thus, the rate constant (k) increases.
- Tue Mar 13, 2018 3:10 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: HW 15.95 e
- Replies: 2
- Views: 419
HW 15.95 e
Since it's not the rate-determining step, I don't think there's an effect right? By the way, if it is on the rate-determining step, it simply lowers the rate constant right? Thanks.
- Tue Mar 13, 2018 3:02 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: reactant concentration [ENDORSED]
- Replies: 4
- Views: 613
Re: reactant concentration [ENDORSED]
Thanks!
- Tue Mar 13, 2018 2:47 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: HW#15.87
- Replies: 2
- Views: 428
HW#15.87
Don't get what the question is asking. I only know that the slow step determines the reaction rate.
- Mon Mar 12, 2018 9:28 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Hw 15.67
- Replies: 5
- Views: 1618
Re: Hw 15.67
Divide the catalyzed over uncatalyzed since it says all other factors equal.
- Sun Mar 11, 2018 11:18 am
- Forum: *Enzyme Kinetics
- Topic: 15.67
- Replies: 4
- Views: 777
Re: 15.67
thanks, I thought rate constant and rate of reaction didn't mean the same thing.
- Sun Mar 11, 2018 10:05 am
- Forum: *Enzyme Kinetics
- Topic: 15.67
- Replies: 4
- Views: 777
15.67
why is the rate of reaction referring to the e^-Ea/RT?
- Sun Mar 11, 2018 9:52 am
- Forum: *Organic Reaction Mechanisms in General
- Topic: Activation Energy and Temperature
- Replies: 3
- Views: 1249
Re: Activation Energy and Temperature
Activation energy is the minimum amount of energy needed for a reaction to take place. Think of it as an entrance fee to a party. Increasing temperature refers to adding heat. Since heat is considered a form of energy, increasing the amount of heat means to increase the amount of energy available in...
- Sun Mar 11, 2018 8:51 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: figure 15.27 interpretations
- Replies: 1
- Views: 261
figure 15.27 interpretations
Hi, for 15.26,I don't understand why is there a peak following a sudden drop and for 15.27, I don't understand how Boltzmann distribution formula e^-Ea/RT explains this graph. Thanks!
- Sat Mar 10, 2018 12:10 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: reactant concentration [ENDORSED]
- Replies: 4
- Views: 613
Re: reactant concentration [ENDORSED]
Thanks ! So we just ignore those elements with big concentrations in the rate law?
- Sat Mar 10, 2018 11:54 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: reactant concentration [ENDORSED]
- Replies: 4
- Views: 613
reactant concentration [ENDORSED]
On Friday 3/2 lecture one slide wrote "but making one reactant concentration small and the others large makes reaction rate dependent only on small concentration reactant.". Can someone explain? Thanks!
- Sat Mar 10, 2018 11:36 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Methods to approach proposed reaction mechanisms
- Replies: 1
- Views: 277
Re: Methods to approach proposed reaction mechanisms
it has been answered.
viewtopic.php?t=20120
viewtopic.php?t=20120
- Sat Mar 10, 2018 11:31 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: HW 15.47
- Replies: 2
- Views: 301
HW 15.47
Can anyone explain the approach as to how to interpret the diagram of the steps? Thank you.
- Sun Mar 04, 2018 10:35 pm
- Forum: General Rate Laws
- Topic: Unique Reaction Rates [ENDORSED]
- Replies: 45
- Views: 164110
Re: Unique Reaction Rates [ENDORSED]
I think instantaneous rate is the general but more accurate measure of the rate of change of concentration, and unique rate is like the instantaneous rate of individual species. (so the name 'unique')
- Sun Mar 04, 2018 9:41 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Units
- Replies: 7
- Views: 1201
Re: Units
Doesn't matter, just beware of the units cancellation when calculating
- Sat Mar 03, 2018 7:23 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: different ways of calculating K
- Replies: 2
- Views: 362
different ways of calculating K
Thanks in advance!
- Thu Feb 22, 2018 6:27 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Table 14.1
- Replies: 1
- Views: 319
Table 14.1
Why can the oxidized species on the left side of the equation oxidize those reduced species below that oxidized species' equation? And why can the reduced species reduce the oxidized species lying above that reduced species? I know that the positive standard reduction potential tells us it's spontan...
- Thu Feb 22, 2018 10:14 am
- Forum: Balancing Redox Reactions
- Topic: Can solids have charges? [ENDORSED]
- Replies: 4
- Views: 2895
Re: Can solids have charges? [ENDORSED]
So can I understand it as when solid is left a single element it has no charge. When it functions as a compound, say NaCl, it (Na (s)) has charge.
- Wed Feb 21, 2018 10:03 pm
- Forum: Balancing Redox Reactions
- Topic: Can solids have charges? [ENDORSED]
- Replies: 4
- Views: 2895
Can solids have charges? [ENDORSED]
Going through some examples, I find that only aqueous solutions and liquids can have charges, just curious if solids can have, why or why not? Thanks in advance!
- Wed Feb 21, 2018 6:31 pm
- Forum: Balancing Redox Reactions
- Topic: Example 14.7 (c)
- Replies: 1
- Views: 306
Example 14.7 (c)
The whole reaction for this example is 6MnO4-(aq)+11 H2O(l)+10Cr3+(aq)---> 6Mn2+(aq)+22 H+(aq)+5Cr2 O7(-2) (aq) Why is the cell diagram Cr2O7 (-2), Cr (3+)(aq),H+(aq)|| H+(aq),MnO4- (aq_,Mn 2+( aq)? I understand that on the left is oxidation, and on the right is reduction, but why is H+ also included?
- Wed Feb 21, 2018 5:45 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Standard potential and redox
- Replies: 1
- Views: 249
Standard potential and redox
Why is that the case "the more negative the standard potential of a couple, the greater is its reducing strength"?
- Wed Feb 21, 2018 11:58 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell diagram [ENDORSED]
- Replies: 3
- Views: 200
Re: Cell diagram [ENDORSED]
That answers my question, thank you!
- Wed Feb 21, 2018 10:25 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell diagram [ENDORSED]
- Replies: 3
- Views: 200
Cell diagram [ENDORSED]
I know that on the left is anode and on the right is cathode. So does the order of those elements matter when writing the cell diagram? (I mean since the left is a oxidation, does the elements have to be in order like the oxidation reaction form?) Thanks.
- Tue Feb 20, 2018 6:57 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: HW 14.9
- Replies: 2
- Views: 252
Re: HW 14.9
That helps alot!
- Tue Feb 20, 2018 6:31 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: HW 14.9
- Replies: 2
- Views: 252
HW 14.9
I fail to understand the number of mols. How to figure that out from the equation? Thanks.
- Tue Feb 20, 2018 5:27 pm
- Forum: Balancing Redox Reactions
- Topic: Determining acidic or basic solution
- Replies: 3
- Views: 533
Determining acidic or basic solution
How do we know at first hand? Thanks.
- Tue Feb 20, 2018 5:23 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing
- Replies: 2
- Views: 4336
Re: Balancing
No way to figure out at first hand, read the Toolbox 14.1 and do it step by step.
- Tue Feb 20, 2018 5:22 pm
- Forum: Balancing Redox Reactions
- Topic: oxidation
- Replies: 4
- Views: 772
Re: oxidation
Yeah, it's 0.
- Tue Feb 20, 2018 5:22 pm
- Forum: Balancing Redox Reactions
- Topic: List of Steps for Redox Rxns
- Replies: 1
- Views: 272
Re: List of Steps for Redox Rxns
1. write and balance half-reactions except O and H 2. For acidic solution, balance O by H2O; H by H+. For basic, balance O by H2O; H by H2O to the side that needs H and add OH- to the other 3. balance electric charges by adding electrons to left for reduction; right for oxidation. Hope it's straight...
- Tue Feb 13, 2018 9:51 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Is entropy always reversible?
- Replies: 1
- Views: 215
Is entropy always reversible?
Also what's the difference between reversibility of work? Is that for the reversible, the pressure is not constant,and for the irreversible, the pressure is constant? Thanks in advance!
- Sun Feb 11, 2018 9:37 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: When does C = 5/2 R or 6/2 R?
- Replies: 2
- Views: 421
Re: When does C = 5/2 R or 6/2 R?
There is a chart back in 8.8 i think that will help you understand.
- Sun Feb 11, 2018 9:35 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: 9.7
- Replies: 1
- Views: 326
Re: 9.7
Hi, it's because according to ideal gas, PV=nRT. It says independent of temperature, which means that there is no relation between pressure and volume for that equation and therefore we shouldn't have to account for the volume.
- Wed Feb 07, 2018 10:07 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: thermodynamically stable vs unstable compound
- Replies: 1
- Views: 725
thermodynamically stable vs unstable compound
Do we have to be able to distinguish and identify those kinds of compounds?
- Tue Feb 06, 2018 7:08 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Hw 9.43
- Replies: 1
- Views: 352
Hw 9.43
So for this one, can someone explain why we are treating one (either hot or cold water) as system and the other as surroundings? Because the heat transfer is happening only at those two?
- Sun Feb 04, 2018 10:17 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: delta S vs S
- Replies: 1
- Views: 230
Re: delta S vs S
The Boltzmann constant is used to calculate simpler entropy, so it is more precise than the Q rev/T. The Q rev/T is to calculate the bulk change(so less precise) and therefore there is a delta sign.
- Sun Feb 04, 2018 10:15 pm
- Forum: Calculating Work of Expansion
- Topic: Confused about work formulas and specific heats
- Replies: 2
- Views: 454
Re: Confused about work formulas and specific heats
No, I don't think so. If the temperature is constant, there should be some calculation for the change in volume or pressure. Since the formulas in the book doesn't specify those conditions you said, there shouldn't be that condition to consider. Going over examples will help you develop a further un...
- Sun Feb 04, 2018 8:52 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Question about Change in Gibb's Free Energy
- Replies: 4
- Views: 491
Re: Question about Change in Gibb's Free Energy
I think it is the energy associated with a chemical reaction that can be used to do work.
- Sun Feb 04, 2018 11:32 am
- Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Topic: What does reversibility have to do with entropy?
- Replies: 1
- Views: 206
What does reversibility have to do with entropy?
Thanks in advance!
- Sun Jan 28, 2018 9:57 pm
- Forum: Calculating Work of Expansion
- Topic: In which situation does delta U=0 and that q=-w
- Replies: 4
- Views: 3299
Re: In which situation does delta U=0 and that q=-w
By the way,is the reversible work equation also used for isothermal situation only?
- Sun Jan 28, 2018 8:05 pm
- Forum: Calculating Work of Expansion
- Topic: In which situation does delta U=0 and that q=-w
- Replies: 4
- Views: 3299
In which situation does delta U=0 and that q=-w
Can anyone explain this? Thanks in advance!
- Wed Jan 24, 2018 4:49 pm
- Forum: Phase Changes & Related Calculations
- Topic: How to differentiate when to use certain formulas
- Replies: 3
- Views: 536
Re: How to differentiate when to use certain formulas
I think knowing the formula for work,change in internal energy, change in enthalpy, and calculation of heat are most important that many other equations can be derived from those.
- Mon Jan 22, 2018 9:49 am
- Forum: Phase Changes & Related Calculations
- Topic: 8.87 Standard enthalpy of vaporization of water
- Replies: 2
- Views: 937
Re: 8.87 Standard enthalpy of vaporization of water
So,at the starting point it's an ice. According to the phase change in enthalpy, there is energy spent on breaking the bond to level to next phase. So from the table 8.3 you know the change in fusion of enthalpy and vaporization of enthalpy, then you can use those values to calculate the individual ...
- Sun Jan 21, 2018 2:45 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Change in temperature,volume and pressure for different equations
- Replies: 2
- Views: 344
Re: Change in temperature,volume and pressure for different equations
Thanks a million in advance, that would be really helpful!!
- Sun Jan 21, 2018 2:45 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Change in temperature,volume and pressure for different equations
- Replies: 2
- Views: 344
Change in temperature,volume and pressure for different equations
Hey guys,for this chapter,there are many situations in which we are taking the change in temperature,volume and pressure into account. I am always confused when we should assume which change is zero under which situation. For example, I know that in an isolated system the internal energy is constant...
- Tue Jan 16, 2018 9:41 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: standard state of substances
- Replies: 4
- Views: 361
Re: standard state of substances
OMG lots to cover. Thanks!
- Tue Jan 16, 2018 3:10 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: standard state of substances
- Replies: 4
- Views: 361
standard state of substances
What are some standard states of substances that we have to remember? And what kind of question do we use standard states? I know that for O2 the standard state is O2, for carbon it is graphite. Thanks!
- Mon Jan 15, 2018 5:46 pm
- Forum: Calculating Work of Expansion
- Topic: Will we be given conversion factors on the exam? [ENDORSED]
- Replies: 3
- Views: 397
Re: Will we be given conversion factors on the exam? [ENDORSED]
Same question. In addition, will formulas such as irreversible be given?
- Mon Jan 15, 2018 5:32 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Thermochemical equation
- Replies: 5
- Views: 802
Re: Thermochemical equation
A Thermochemical Equation is a balanced stoichiometric chemical equation that includes the enthalpy change, ΔH. In variable form, a thermochemical equation would look like this: A + B → C. ΔH = (±) #
- Sat Jan 13, 2018 2:37 pm
- Forum: Calculating Work of Expansion
- Topic: application of PV=nRT
- Replies: 3
- Views: 475
Re: application of PV=nRT
Sorry I forgot to add, I am referring to reaction enthalpies.
- Sat Jan 13, 2018 2:15 pm
- Forum: Calculating Work of Expansion
- Topic: application of PV=nRT
- Replies: 3
- Views: 475
application of PV=nRT
I know this formula is for the ideal gas. So when there is a reaction related to gas, say combustion reaction, and question tells us to find the internal energy, is that the correct way of applying? Thanks.
- Sat Jan 13, 2018 2:06 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Paths and Changes of State
- Replies: 3
- Views: 527
Re: Paths and Changes of State
https://lavelle.chem.ucla.edu/wp-conten ... mistry.pdf
It doesn't say we have to draw, but to identify yes.
It doesn't say we have to draw, but to identify yes.
- Thu Jan 11, 2018 5:37 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Missing lectures
- Replies: 1
- Views: 425
Missing lectures
Hi,this is Peter. I missed two lectures this week and curious if someone can give me his/her notes. My email is yfzucla21@g.ucla.edu. Thank you so much in advance!
- Tue Jan 09, 2018 3:36 pm
- Forum: Phase Changes & Related Calculations
- Topic: Endothermic Reaction
- Replies: 10
- Views: 9556
Re: Endothermic Reaction
On Pg 279 it says "melting requires energy to overcome the intermolecular attractions and therefore endothermic." So in order to get the energy it has to absorb and therefore endothermic.
- Sun Dec 10, 2017 9:56 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Exam HCl and NaOH question?
- Replies: 3
- Views: 836
Re: Exam HCl and NaOH question?
Hey,guys, that equation I saw on the fundamentals J. HCl+NaOH--->H2O+NaCl. HCl I remember contains 3.64 g and NaOH has 2 g. Is that we have to find pH=-log(H2O)?
- Sun Dec 10, 2017 8:27 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Replies: 2
- Views: 450
Re: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
And pure solids and liquids are not counted in the reaction.
- Sun Dec 10, 2017 7:42 am
- Forum: Dipole Moments
- Topic: Dipole Occurence
- Replies: 4
- Views: 730
Re: Dipole Occurence
But why CBr2Cl2 is polar? Don't they cancer each other out?
- Sat Dec 09, 2017 3:34 pm
- Forum: Conjugate Acids & Bases
- Topic: 12.119
- Replies: 1
- Views: 306
Re: 12.119
My understanding is there is no electron pairs around central atom, so there is no electrons to donate and therefore acts as a Lewis acid.
- Mon Dec 04, 2017 6:29 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: 5% rule
- Replies: 2
- Views: 1215
5% rule
What is specific about 5% rule in calculating chemical equilibrium of Kw?
- Mon Dec 04, 2017 6:23 pm
- Forum: Lewis Acids & Bases
- Topic: Writing equations with acids and bases
- Replies: 5
- Views: 593
Re: Writing equations with acids and bases
Will the test tell us whether it's strong acid/base or not or we need to remember some?
- Mon Dec 04, 2017 6:11 pm
- Forum: Amphoteric Compounds
- Topic: Basic, Acidic or Amphoteric [ENDORSED]
- Replies: 4
- Views: 829
Re: Basic, Acidic or Amphoteric [ENDORSED]
I am confused exactly how many elements do the diagonal line cover are amphoteric?
- Sun Dec 03, 2017 12:33 pm
- Forum: Lewis Acids & Bases
- Topic: HW12.13
- Replies: 2
- Views: 404
Re: HW12.13
That's so helpful! Thanks.
- Sun Dec 03, 2017 11:34 am
- Forum: Lewis Acids & Bases
- Topic: HW12.13
- Replies: 2
- Views: 404
HW12.13
How to identify Lewis acid and base, can anyone give some examples? Thanks!
- Sun Dec 03, 2017 10:52 am
- Forum: Bronsted Acids & Bases
- Topic: Lewis Acids and Bases Vs. Bronsted Acids and Bases
- Replies: 4
- Views: 590
Re: Lewis Acids and Bases Vs. Bronsted Acids and Bases
From the experience of Test 4,I feel like we definitely need to remember that.
- Sun Nov 26, 2017 8:08 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: How to predict bond angles?
- Replies: 3
- Views: 1073
Re: How to predict bond angles?
Cool,appreciate it!!
- Sun Nov 26, 2017 7:15 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: How to predict bond angles?
- Replies: 3
- Views: 1073
How to predict bond angles?
Can anyone give some examples? Thanks a lot~
- Sun Nov 26, 2017 4:41 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Some clarification about ligands
- Replies: 5
- Views: 639
Re: Some clarification about ligands
Basically a ligand is a Lewis base(which donates electrons) that attaches to the central metal atom. Ex:[Fe(CN)6]^-4. [CN] is a ligand that bings to iron. And the coordination number(number of points ligands attach) is 6. Hope other people can add more.
Re: 17.31 d
Stuck on the same one...OH2 is neutral so why is it in the middle?
- Fri Nov 24, 2017 5:34 pm
- Forum: Biological Examples
- Topic: [Fe(NCS)(OH2)5]2+ name
- Replies: 6
- Views: 1889
Re: [Fe(NCS)(OH2)5]2+ name
Thanks y'all!
- Fri Nov 24, 2017 5:31 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: How can you determine if a complex is a polydentate?
- Replies: 5
- Views: 1152
Re: How can you determine if a complex is a polydentate?
So does it mean we need to draw Lewis Structure to count the lone pairs first?
- Thu Nov 23, 2017 7:02 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Naming Coordination Compounds
- Replies: 4
- Views: 665
Re: Naming Coordination Compounds
Cynaide is an anionic ligand, which follows rule #3 on Tool box 17.1.
For second question, yes there are two ligands.
Suggestion:Try to break down the procedure on the book as simple as possible.I read like more than 10 times and form an idea.
For second question, yes there are two ligands.
Suggestion:Try to break down the procedure on the book as simple as possible.I read like more than 10 times and form an idea.
- Mon Nov 20, 2017 3:19 pm
- Forum: Biological Examples
- Topic: [Fe(NCS)(OH2)5]2+ name
- Replies: 6
- Views: 1889
Re: [Fe(NCS)(OH2)5]2+ name
Wait, do we need to know the names?
- Mon Nov 20, 2017 10:49 am
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 151622
Re: Reading the textbook
Reading textbook+watching online sources are helpful to me. Only reading the textbook gains little help.
- Wed Nov 15, 2017 9:21 pm
- Forum: Hybridization
- Topic: Benzene Hybridization [ENDORSED]
- Replies: 4
- Views: 1663
Re: Benzene Hybridization [ENDORSED]
I was going to ask the same question...Nice picture!
- Wed Nov 15, 2017 7:06 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Determing Molecular Shape
- Replies: 2
- Views: 250
Re: Determing Molecular Shape
I hope I should have known that earlier or the points will not be lost. This is an important concept and it might be in the final again.
- Sun Nov 12, 2017 1:34 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Quick Determination of FC [ENDORSED]
- Replies: 6
- Views: 1110
Re: Quick Determination of FC [ENDORSED]
Thanks for both wonderful explanations!
- Wed Nov 08, 2017 1:21 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic and Covalent Bonds
- Replies: 9
- Views: 1153
Re: Ionic and Covalent Bonds
Ionic bonds are usually metals+nonmentals. NaCl,NaF,LiF are good examples. Covalent bonds are usually two nonmetals. CH4,H2O and CO2 are good examples.
- Tue Oct 31, 2017 2:48 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Homework Problem 2.55
- Replies: 5
- Views: 749
Re: Homework Problem 2.55
From the answer key, it seems like it's referring to Group 5 counting from the transition metals. It says (n-1)d^5 ns^2. I was confused by that at first.
- Sun Oct 29, 2017 9:50 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: d and s blocks
- Replies: 16
- Views: 2211
Re: d and s blocks
Most of the time quantum numbers are written in order,except for 2 elements,Cr and Cu.
- Sun Oct 29, 2017 9:40 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: orbitals [ENDORSED]
- Replies: 5
- Views: 553
Re: orbitals [ENDORSED]
Just a quick note s subshell can hold 1 orbital(2 electrons), p subshell 3 orbitals(6 e), d subshell 5orbitals (10e),f subshell 7 orbitals(14 e).
- Sun Oct 22, 2017 10:45 pm
- Forum: *Shrodinger Equation
- Topic: HΨ=EΨ [ENDORSED]
- Replies: 5
- Views: 4489
Re: HΨ=EΨ [ENDORSED]
I have the same question. Thanks guys for explaining!
- Wed Oct 18, 2017 8:24 pm
- Forum: Properties of Light
- Topic: Wave Properties of Light Post assessment#31
- Replies: 3
- Views: 575
- Wed Oct 18, 2017 4:05 pm
- Forum: Properties of Light
- Topic: Wave Properties of Light Post assessment#31
- Replies: 3
- Views: 575
Wave Properties of Light Post assessment#31
Calculate the de Broglie wavelength of a 0.155 kg ball travelling at 85.0 m.s-1. Can we detect this wavelength or observe the wavelike characteristics of this ball? I am stuck on second one. Can anyone tell me when we can or can't detect wavelength? Thanks.
- Mon Oct 16, 2017 7:12 am
- Forum: Einstein Equation
- Topic: Lyman and Blamer series [ENDORSED]
- Replies: 7
- Views: 1205
Re: Lyman and Blamer series [ENDORSED]
Counting the vowel is cool. I start to remember that. Thanks!
- Mon Oct 16, 2017 7:09 am
- Forum: *Black Body Radiation
- Topic: Black body for quiz 2 [ENDORSED]
- Replies: 11
- Views: 1766
Re: Black body for quiz 2 [ENDORSED]
But overall,it's still an important concept.I recommend looking at it even if not tested.
- Sun Oct 08, 2017 9:38 pm
- Forum: Properties of Light
- Topic: Calculating the wavelength of light
- Replies: 2
- Views: 298
Re: Calculating the wavelength of light
Agree with the above. Saving decimals until the answer
- Sun Oct 08, 2017 6:15 pm
- Forum: Properties of Light
- Topic: Chapter 1, problem 3 [ENDORSED]
- Replies: 10
- Views: 1484
Re: Chapter 1, problem 3 [ENDORSED]
wait,so what's the answer?is that D? I found from the internet that the shorter the frequency,the larger the radiation energy.