## Search found 43 matches

Sun Mar 18, 2018 9:07 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: S and pressure
Replies: 3
Views: 429

### S and pressure

Will S increase if pressure increases or decreases?
Sun Mar 18, 2018 9:05 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: w
Replies: 2
Views: 429

### w

just to verify: w is the number of orientation (# of ways to arrange the atoms in a molecule) to the power of however many molecules are involved?
Sun Mar 18, 2018 9:03 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: metal dissolved
Replies: 2
Views: 286

### metal dissolved

what's the best way to distinguish if a metal will dissolve in a solution?
Sun Mar 18, 2018 9:02 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: work, cell potential, and free energy
Replies: 1
Views: 224

### work, cell potential, and free energy

what is the relationship between work, cell potential, and free energy?
Sun Mar 18, 2018 9:00 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: maximum potential
Replies: 1
Views: 230

### maximum potential

how does emf represent the maximum potential difference?
Sun Mar 18, 2018 8:59 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: rate of change
Replies: 4
Views: 364

### rate of change

how does the rate of change of one species in a reaction relate to another species?
Sun Mar 18, 2018 8:56 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: arrhenius
Replies: 1
Views: 248

### arrhenius

where does the equation k2/k1=H/R(1/T -1/T) come from? I can't figure out the derivation.
Sun Mar 18, 2018 8:50 pm
Forum: General Rate Laws
Topic: rate proportions
Replies: 2
Views: 450

### rate proportions

what does a rate proportion depend on? for example what will happen to a rate if the amount of a molecule doubles or halves?
Sun Mar 18, 2018 8:42 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: change in volume and then temperature
Replies: 1
Views: 236

### change in volume and then temperature

if there is a change in volume and then change in temperature would finding each and then adding both provide the overall entropy value?
Sun Mar 18, 2018 8:38 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: mechanism order
Replies: 1
Views: 287

### mechanism order

if a slow step is the first step and the fast step is the second in a mechanism, will the rate just be based on the first step or would you have to remove the intermediate and use k for a substitute in the second step?
Sun Mar 18, 2018 8:36 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: catalysts
Replies: 3
Views: 546

### catalysts

how do you identify a catalyst in a two step reaction?
Sun Mar 18, 2018 8:34 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: cell diagram placement
Replies: 1
Views: 264

### cell diagram placement

I know that the left side of the salt bridge in a cell diagram represents the anode and the right side the cathode. The single line differentiates reaction/product. But sometimes it isn't written in that way so I just want to know how to correctly place the factors in a cell diagram?
Sun Mar 18, 2018 8:30 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: mechanism differentiation
Replies: 2
Views: 307

### mechanism differentiation

how do you differentiate between two mechanism using rate laws?
Sun Mar 18, 2018 8:28 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: microstate and expansion
Replies: 1
Views: 249

### microstate and expansion

So if a gas expands the microstate of a molecule will increase?
Sun Mar 18, 2018 8:27 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: n: negative or positive
Replies: 2
Views: 504

### n: negative or positive

So when you plug in n for the electron it corresponds to in equations will it always be negative?
Sun Mar 18, 2018 8:21 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Conductor
Replies: 1
Views: 207

### Conductor

When do you know when to use a conductor? And what side you would add it on a cell diagram?
Sat Mar 17, 2018 7:20 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Solve for Q
Replies: 2
Views: 263

### Solve for Q

How do you solve for Q when you aren't given E?
asking from test 2 #8b... or do you just divide the moralities given? if so i got 1.5*10^5 is that correct?
Sat Mar 17, 2018 6:27 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Test 2 #3
Replies: 2
Views: 297

### Test 2 #3

I re-did this problem and want to make sure i got the right answer: K=1.6 10^15 and therefore it is spontaneous.
Sat Mar 17, 2018 6:01 am
Forum: Balancing Redox Reactions
Topic: Test 2
Replies: 2
Views: 269

### Test 2

I just want to double check my answer for #1 on the test: a) i got the oxidation state for C will be +4 and b) the reduced species is oxygen
Sat Mar 17, 2018 5:40 am
Forum: Balancing Redox Reactions
Topic: reducing and oxidizing agents
Replies: 2
Views: 197

### reducing and oxidizing agents

Why are reducing and oxidizing agents the opposites of reduction and oxidation?
Sat Mar 17, 2018 1:46 am
Forum: Phase Changes & Related Calculations
Topic: Sign for compression vs expansion
Replies: 4
Views: 368

### Sign for compression vs expansion

When using the equation for w=-P$\Delta V$ is it true that for compression the answer will be positive and for expansion it will be negative?
Tue Mar 13, 2018 6:56 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Standard Hydrogen Electrode
Replies: 1
Views: 129

### Standard Hydrogen Electrode

What is the best way to identify a cathode and an anode in a cell diagram? I thought I understood it but I got confused while reading the book. On pg 578 it says that the cell potential will be attributed to the copper electrode because the standard hydrogen electrode is always zero, but for the zin...
Fri Mar 09, 2018 6:49 pm
Forum: Balancing Redox Reactions
Topic: Oxidation Number
Replies: 4
Views: 233

### Oxidation Number

The example of the textbook 14.1 says that Mn has an oxidation number of +7, where does this number come from?
Tue Feb 13, 2018 6:38 pm
Forum: Calculating Work of Expansion
Topic: -w vs +w
Replies: 2
Views: 207

### -w vs +w

Just to clarify: if work is positive that means expansion and if it is negative it means compression?
Mon Jan 22, 2018 9:14 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Reaction Sequences
Replies: 1
Views: 135

### Reaction Sequences

Is there an easy, quick way to calculate the overall reaction enthalpy from the enthalpies of the reactions in a reaction sequence? I understand the steps but it takes me a while so I'm wondering if there is a quicker way or is it mostly trial and error.
Sun Jan 21, 2018 1:05 am
Forum: Phase Changes & Related Calculations
Topic: Equations to know
Replies: 6
Views: 268

### Equations to know

Are ALL the formulas we need to know gonna be in the "Constants and Formulas " sheet provided for us or are there any that aren't on there nut we should know?
Sat Jan 20, 2018 11:34 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 8.37
Replies: 1
Views: 147

### 8.37

Why is the enthalpy of vaporization for this problem 4.76 kJ of heat/0.579 mol (from solution manual)?
Sat Jan 20, 2018 5:51 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: 8.5
Replies: 3
Views: 273

### 8.5

In the question, it says 340 kJ of work is compressed so shouldn't it be negative (because it is being compressed) when we add it to 524 kJ of heat? (so instead of 864 kJ it is 184 kJ?)
Sat Jan 20, 2018 4:29 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Example 8.7
Replies: 1
Views: 100

### Example 8.7

Why is the equation to figure the change in enthalpy $\Delta H$ =(2mol)*q/n ? I understand the 2 mol comes from benzene but why do we have to do q/n?
Tue Jan 16, 2018 1:04 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: K vs C
Replies: 6
Views: 280

### Re: K vs C

SO just to be sure because i had the same question concerning K vs C: you can use K and C interchangeably without affecting the answer?
Tue Nov 28, 2017 8:43 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE Box
Replies: 3
Views: 406

### ICE Box

When determining the change in pressure, how do you know whether the "x" will be positive or negative? What determines this?
Tue Nov 28, 2017 8:42 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE Box
Replies: 1
Views: 273

### ICE Box

how do you get the sum of the first two reactions to equal the third reaction? asking from example in Chapter 11 pg 439.
Also why do we multiply the second reaction by a factor of 2?
Wed Nov 22, 2017 2:50 am
Forum: Photoelectric Effect
Topic: Higher Frequency and Kinetic Energy [ENDORSED]
Replies: 5
Views: 531

### Higher Frequency and Kinetic Energy[ENDORSED]

Higher frequency light always emits electrons with higher: kinetic energy or low kinetic energy?
Wed Nov 22, 2017 2:38 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K and Kc
Replies: 7
Views: 470

### K and Kc

What is the difference between using K and Kc?
Wed Nov 22, 2017 2:37 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: "Phase"
Replies: 5
Views: 315

### "Phase"

what does it mean for reactants and products to be in "phase"? What is a phase?
Wed Nov 22, 2017 2:34 am
Forum: Dipole Moments
Topic: Dipole Moments
Replies: 2
Views: 237

### Dipole Moments

How can you determine which element will affect dipole moments? Or is it depending on the compound? In other words, is determining dipole moments dependent on what the element is in a compound or the structure of a compound? I'm having a hard time grasping dipole moments.
Wed Nov 22, 2017 1:18 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Chemical Equilibrium
Replies: 2
Views: 211

### Chemical Equilibrium

When writing the equilibrium constant for a reaction, why do we exclude solids, solvents, and liquids? Are those the only solutions we exclude when writing the equilibrium constant expression?
Mon Nov 20, 2017 8:06 pm
Forum: Equilibrium Constants & Calculating Concentrations
Replies: 1
Views: 165

Can anyone tell me what $\Delta G$ means or refers to in the reading of chapter 11?
Mon Nov 13, 2017 10:18 pm
Forum: Limiting Reactant Calculations
Topic: Limiting Reactant vs Theoretical Yield
Replies: 3
Views: 1085

### Limiting Reactant vs Theoretical Yield

What is the difference between a limiting reactant and a theoretical yield? Or are they the same?
Mon Nov 13, 2017 10:09 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Cation & Anion Polarity
Replies: 3
Views: 1425

### Cation & Anion Polarity

Does the polarizing power of a cation or anion depend on its size? i.e. the smallest cation or largest anion is the most polarizable?
Mon Nov 13, 2017 9:57 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Ionization energy
Replies: 2
Views: 384

### Ionization energy

In ranking C N O F in order of increasing ionization energy, the answer is C<O<N<F; but why is Oxygen more ionic than Nitrogen?
Mon Nov 13, 2017 9:52 pm
Forum: Electronegativity
Topic: Electroegativity
Replies: 9
Views: 680

### Electroegativity

How can you tell whether one compound is more electronegative than another one without using the electronegativity trend?
Mon Nov 13, 2017 9:22 pm
Forum: Electronegativity
Topic: Isoelectronic [ENDORSED]
Replies: 11
Views: 828

### Isoelectronic[ENDORSED]

What does it mean for elements to be isoelectronic?