Search found 97 matches

by Peter Dis1G
Sat Mar 17, 2018 11:45 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: 14.93
Replies: 1
Views: 191

14.93

Can anyone explain why does reduction take place at higher concentration?
by Peter Dis1G
Sat Mar 17, 2018 9:23 am
Forum: Balancing Redox Reactions
Topic: reducing and oxidizing agents
Replies: 2
Views: 139

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.
by Peter Dis1G
Sat Mar 17, 2018 9:08 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: 15.109
Replies: 2
Views: 160

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?
by Peter Dis1G
Fri Mar 16, 2018 4:06 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: 15.109
Replies: 2
Views: 160

15.109

Hi,I don't understand how there's a manipulation done on the arrhenius equation.
by Peter Dis1G
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: 191

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.
by Peter Dis1G
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: 130

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?
by Peter Dis1G
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: 134

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 ...
by Peter Dis1G
Wed Mar 14, 2018 4:51 pm
Forum: Balancing Redox Reactions
Topic: Winter 2013 final Q4
Replies: 9
Views: 443

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.
by Peter Dis1G
Wed Mar 14, 2018 12:32 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: 15.101 C and D [ENDORSED]
Replies: 1
Views: 111

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.
by Peter Dis1G
Wed Mar 14, 2018 12:26 pm
Forum: *Enzyme Kinetics
Topic: Catalyst and equilibrium constant
Replies: 3
Views: 638

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?
by Peter Dis1G
Tue Mar 13, 2018 5:03 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: HW 15.95 e
Replies: 2
Views: 131

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.
by Peter Dis1G
Tue Mar 13, 2018 3:10 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: HW 15.95 e
Replies: 2
Views: 131

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.
by Peter Dis1G
Tue Mar 13, 2018 2:47 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: HW#15.87
Replies: 2
Views: 128

HW#15.87

Don't get what the question is asking. I only know that the slow step determines the reaction rate.
by Peter Dis1G
Mon Mar 12, 2018 9:28 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Hw 15.67
Replies: 5
Views: 325

Re: Hw 15.67

Divide the catalyzed over uncatalyzed since it says all other factors equal.
by Peter Dis1G
Sun Mar 11, 2018 11:18 am
Forum: *Enzyme Kinetics
Topic: 15.67
Replies: 4
Views: 301

Re: 15.67

thanks, I thought rate constant and rate of reaction didn't mean the same thing.
by Peter Dis1G
Sun Mar 11, 2018 10:05 am
Forum: *Enzyme Kinetics
Topic: 15.67
Replies: 4
Views: 301

15.67

why is the rate of reaction referring to the e^-Ea/RT?
by Peter Dis1G
Sun Mar 11, 2018 9:52 am
Forum: *Organic Reaction Mechanisms in General
Topic: Activation Energy and Temperature
Replies: 3
Views: 327

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...
by Peter Dis1G
Sun Mar 11, 2018 8:51 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: figure 15.27 interpretations
Replies: 1
Views: 71

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!
by Peter Dis1G
Sat Mar 10, 2018 12:10 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: reactant concentration [ENDORSED]
Replies: 4
Views: 202

Re: reactant concentration [ENDORSED]

Thanks ! So we just ignore those elements with big concentrations in the rate law?
by Peter Dis1G
Sat Mar 10, 2018 11:54 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: reactant concentration [ENDORSED]
Replies: 4
Views: 202

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!
by Peter Dis1G
Sat Mar 10, 2018 11:31 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: HW 15.47
Replies: 2
Views: 98

HW 15.47

Can anyone explain the approach as to how to interpret the diagram of the steps? Thank you.
by Peter Dis1G
Sun Mar 04, 2018 10:35 pm
Forum: General Rate Laws
Topic: Unique Reaction Rates [ENDORSED]
Replies: 32
Views: 61051

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')
by Peter Dis1G
Sun Mar 04, 2018 9:41 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Units
Replies: 7
Views: 545

Re: Units

Doesn't matter, just beware of the units cancellation when calculating
by Peter Dis1G
Thu Feb 22, 2018 6:27 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Table 14.1
Replies: 1
Views: 121

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...
by Peter Dis1G
Thu Feb 22, 2018 10:14 am
Forum: Balancing Redox Reactions
Topic: Can solids have charges? [ENDORSED]
Replies: 4
Views: 341

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.
by Peter Dis1G
Wed Feb 21, 2018 10:03 pm
Forum: Balancing Redox Reactions
Topic: Can solids have charges? [ENDORSED]
Replies: 4
Views: 341

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!
by Peter Dis1G
Wed Feb 21, 2018 6:31 pm
Forum: Balancing Redox Reactions
Topic: Example 14.7 (c)
Replies: 1
Views: 97

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?
by Peter Dis1G
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: 81

Standard potential and redox

Why is that the case "the more negative the standard potential of a couple, the greater is its reducing strength"?
by Peter Dis1G
Wed Feb 21, 2018 11:58 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell diagram [ENDORSED]
Replies: 3
Views: 91

Re: Cell diagram [ENDORSED]

That answers my question, thank you!
by Peter Dis1G
Wed Feb 21, 2018 10:25 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell diagram [ENDORSED]
Replies: 3
Views: 91

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.
by Peter Dis1G
Tue Feb 20, 2018 6:57 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: HW 14.9
Replies: 2
Views: 76

Re: HW 14.9

That helps alot!
by Peter Dis1G
Tue Feb 20, 2018 6:31 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: HW 14.9
Replies: 2
Views: 76

HW 14.9

I fail to understand the number of mols. How to figure that out from the equation? Thanks.
by Peter Dis1G
Tue Feb 20, 2018 5:27 pm
Forum: Balancing Redox Reactions
Topic: Determining acidic or basic solution
Replies: 3
Views: 151

Determining acidic or basic solution

How do we know at first hand? Thanks.
by Peter Dis1G
Tue Feb 20, 2018 5:23 pm
Forum: Balancing Redox Reactions
Topic: Balancing
Replies: 2
Views: 4049

Re: Balancing

No way to figure out at first hand, read the Toolbox 14.1 and do it step by step.
by Peter Dis1G
Tue Feb 20, 2018 5:22 pm
Forum: Balancing Redox Reactions
Topic: oxidation
Replies: 4
Views: 196

Re: oxidation

Yeah, it's 0.
by Peter Dis1G
Tue Feb 20, 2018 5:22 pm
Forum: Balancing Redox Reactions
Topic: List of Steps for Redox Rxns
Replies: 1
Views: 92

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...
by Peter Dis1G
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: 88

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!
by Peter Dis1G
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: 125

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.
by Peter Dis1G
Sun Feb 11, 2018 9:35 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 9.7
Replies: 1
Views: 115

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.
by Peter Dis1G
Wed Feb 07, 2018 10:07 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: thermodynamically stable vs unstable compound
Replies: 1
Views: 108

thermodynamically stable vs unstable compound

Do we have to be able to distinguish and identify those kinds of compounds?
by Peter Dis1G
Tue Feb 06, 2018 7:08 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Hw 9.43
Replies: 1
Views: 131

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?
by Peter Dis1G
Sun Feb 04, 2018 10:17 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: delta S vs S
Replies: 1
Views: 78

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.
by Peter Dis1G
Sun Feb 04, 2018 10:15 pm
Forum: Calculating Work of Expansion
Topic: Confused about work formulas and specific heats
Replies: 2
Views: 164

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...
by Peter Dis1G
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: 125

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.
by Peter Dis1G
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: 156

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?
by Peter Dis1G
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: 156

In which situation does delta U=0 and that q=-w

Can anyone explain this? Thanks in advance!
by Peter Dis1G
Wed Jan 24, 2018 4:49 pm
Forum: Phase Changes & Related Calculations
Topic: How to differentiate when to use certain formulas
Replies: 3
Views: 185

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.
by Peter Dis1G
Mon Jan 22, 2018 9:49 am
Forum: Phase Changes & Related Calculations
Topic: 8.87 Standard enthalpy of vaporization of water
Replies: 2
Views: 265

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 ...
by Peter Dis1G
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: 107

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...
by Peter Dis1G
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: 175

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!
by Peter Dis1G
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: 229

Re: Will we be given conversion factors on the exam? [ENDORSED]

Same question. In addition, will formulas such as irreversible be given?
by Peter Dis1G
Mon Jan 15, 2018 5:32 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Thermochemical equation
Replies: 5
Views: 265

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 = (±) #
by Peter Dis1G
Sat Jan 13, 2018 2:37 pm
Forum: Calculating Work of Expansion
Topic: application of PV=nRT
Replies: 3
Views: 140

Re: application of PV=nRT

Sorry I forgot to add, I am referring to reaction enthalpies.
by Peter Dis1G
Sat Jan 13, 2018 2:15 pm
Forum: Calculating Work of Expansion
Topic: application of PV=nRT
Replies: 3
Views: 140

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.
by Peter Dis1G
Thu Jan 11, 2018 5:37 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Missing lectures
Replies: 1
Views: 184

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!
by Peter Dis1G
Tue Jan 09, 2018 3:36 pm
Forum: Phase Changes & Related Calculations
Topic: Endothermic Reaction
Replies: 10
Views: 1036

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.
by Peter Dis1G
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: 423

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)?
by Peter Dis1G
Sun Dec 10, 2017 7:42 am
Forum: Dipole Moments
Topic: Dipole Occurence
Replies: 4
Views: 330

Re: Dipole Occurence

But why CBr2Cl2 is polar? Don't they cancer each other out?
by Peter Dis1G
Sat Dec 09, 2017 3:34 pm
Forum: Conjugate Acids & Bases
Topic: 12.119
Replies: 1
Views: 186

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.
by Peter Dis1G
Mon Dec 04, 2017 6:29 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: 5% rule
Replies: 2
Views: 268

5% rule

What is specific about 5% rule in calculating chemical equilibrium of Kw?
by Peter Dis1G
Mon Dec 04, 2017 6:23 pm
Forum: Lewis Acids & Bases
Topic: Writing equations with acids and bases
Replies: 5
Views: 231

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?
by Peter Dis1G
Mon Dec 04, 2017 6:11 pm
Forum: Amphoteric Compounds
Topic: Basic, Acidic or Amphoteric [ENDORSED]
Replies: 4
Views: 426

Re: Basic, Acidic or Amphoteric [ENDORSED]

I am confused exactly how many elements do the diagonal line cover are amphoteric?
by Peter Dis1G
Sun Dec 03, 2017 12:33 pm
Forum: Lewis Acids & Bases
Topic: HW12.13
Replies: 2
Views: 172

Re: HW12.13

That's so helpful! Thanks.
by Peter Dis1G
Sun Dec 03, 2017 11:34 am
Forum: Lewis Acids & Bases
Topic: HW12.13
Replies: 2
Views: 172

HW12.13

How to identify Lewis acid and base, can anyone give some examples? Thanks!
by Peter Dis1G
Sun Dec 03, 2017 10:52 am
Forum: Bronsted Acids & Bases
Topic: Lewis Acids and Bases Vs. Bronsted Acids and Bases
Replies: 4
Views: 238

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.
by Peter Dis1G
Sun Nov 26, 2017 8:08 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: How to predict bond angles?
Replies: 3
Views: 248

Re: How to predict bond angles?

Cool,appreciate it!!
by Peter Dis1G
Sun Nov 26, 2017 7:15 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: How to predict bond angles?
Replies: 3
Views: 248

How to predict bond angles?

Can anyone give some examples? Thanks a lot~
by Peter Dis1G
Sun Nov 26, 2017 4:41 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Some clarification about ligands
Replies: 5
Views: 224

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.
by Peter Dis1G
Fri Nov 24, 2017 5:49 pm
Forum: Naming
Topic: 17.31 d
Replies: 2
Views: 145

Re: 17.31 d

Stuck on the same one...OH2 is neutral so why is it in the middle?
by Peter Dis1G
Fri Nov 24, 2017 5:34 pm
Forum: Biological Examples
Topic: [Fe(NCS)(OH2)5]2+ name
Replies: 6
Views: 364

Re: [Fe(NCS)(OH2)5]2+ name

Thanks y'all!
by Peter Dis1G
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: 343

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?
by Peter Dis1G
Thu Nov 23, 2017 7:02 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Naming Coordination Compounds
Replies: 4
Views: 229

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.
by Peter Dis1G
Mon Nov 20, 2017 3:19 pm
Forum: Biological Examples
Topic: [Fe(NCS)(OH2)5]2+ name
Replies: 6
Views: 364

Re: [Fe(NCS)(OH2)5]2+ name

Wait, do we need to know the names?
by Peter Dis1G
Mon Nov 20, 2017 10:49 am
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 128
Views: 75169

Re: Reading the textbook [ENDORSED]

Reading textbook+watching online sources are helpful to me. Only reading the textbook gains little help.
by Peter Dis1G
Wed Nov 15, 2017 9:21 pm
Forum: Hybridization
Topic: Benzene Hybridization [ENDORSED]
Replies: 4
Views: 763

Re: Benzene Hybridization [ENDORSED]

I was going to ask the same question...Nice picture!
by Peter Dis1G
Wed Nov 15, 2017 7:06 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Determing Molecular Shape
Replies: 2
Views: 128

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.
by Peter Dis1G
Sun Nov 12, 2017 1:34 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Quick Determination of FC [ENDORSED]
Replies: 6
Views: 449

Re: Quick Determination of FC [ENDORSED]

Thanks for both wonderful explanations!
by Peter Dis1G
Wed Nov 08, 2017 1:21 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic and Covalent Bonds
Replies: 9
Views: 375

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.
by Peter Dis1G
Tue Oct 31, 2017 2:48 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Homework Problem 2.55
Replies: 5
Views: 262

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.
by Peter Dis1G
Sun Oct 29, 2017 9:50 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: d and s blocks
Replies: 16
Views: 724

Re: d and s blocks

Most of the time quantum numbers are written in order,except for 2 elements,Cr and Cu.
by Peter Dis1G
Sun Oct 29, 2017 9:40 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: orbitals [ENDORSED]
Replies: 5
Views: 243

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).
by Peter Dis1G
Sun Oct 22, 2017 10:45 pm
Forum: *Shrodinger Equation
Topic: HΨ=EΨ [ENDORSED]
Replies: 5
Views: 742

Re: HΨ=EΨ [ENDORSED]

I have the same question. Thanks guys for explaining!
by Peter Dis1G
Wed Oct 18, 2017 4:05 pm
Forum: Properties of Light
Topic: Wave Properties of Light Post assessment#31
Replies: 3
Views: 227

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.
by Peter Dis1G
Mon Oct 16, 2017 7:12 am
Forum: Einstein Equation
Topic: Lyman and Blamer series [ENDORSED]
Replies: 7
Views: 663

Re: Lyman and Blamer series [ENDORSED]

Counting the vowel is cool. I start to remember that. Thanks!
by Peter Dis1G
Mon Oct 16, 2017 7:09 am
Forum: *Black Body Radiation
Topic: Black body for quiz 2 [ENDORSED]
Replies: 11
Views: 805

Re: Black body for quiz 2 [ENDORSED]

But overall,it's still an important concept.I recommend looking at it even if not tested.
by Peter Dis1G
Sun Oct 08, 2017 9:38 pm
Forum: Properties of Light
Topic: Calculating the wavelength of light
Replies: 2
Views: 139

Re: Calculating the wavelength of light

Agree with the above. Saving decimals until the answer
by Peter Dis1G
Sun Oct 08, 2017 6:15 pm
Forum: Properties of Light
Topic: Chapter 1, problem 3 [ENDORSED]
Replies: 10
Views: 686

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.

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