Search found 43 matches

by Kassandra Molina 2B
Sun Mar 18, 2018 9:07 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: S and pressure
Replies: 3
Views: 334

S and pressure

Will S increase if pressure increases or decreases?
by Kassandra Molina 2B
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: 346

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?
by Kassandra Molina 2B
Sun Mar 18, 2018 9:03 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: metal dissolved
Replies: 2
Views: 202

metal dissolved

what's the best way to distinguish if a metal will dissolve in a solution?
by Kassandra Molina 2B
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: 154

work, cell potential, and free energy

what is the relationship between work, cell potential, and free energy?
by Kassandra Molina 2B
Sun Mar 18, 2018 9:00 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: maximum potential
Replies: 1
Views: 166

maximum potential

how does emf represent the maximum potential difference?
by Kassandra Molina 2B
Sun Mar 18, 2018 8:59 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: rate of change
Replies: 4
Views: 234

rate of change

how does the rate of change of one species in a reaction relate to another species?
by Kassandra Molina 2B
Sun Mar 18, 2018 8:56 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: arrhenius
Replies: 1
Views: 177

arrhenius

where does the equation k2/k1=H/R(1/T -1/T) come from? I can't figure out the derivation.
by Kassandra Molina 2B
Sun Mar 18, 2018 8:50 pm
Forum: General Rate Laws
Topic: rate proportions
Replies: 2
Views: 357

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?
by Kassandra Molina 2B
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: 191

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?
by Kassandra Molina 2B
Sun Mar 18, 2018 8:38 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: mechanism order
Replies: 1
Views: 223

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?
by Kassandra Molina 2B
Sun Mar 18, 2018 8:36 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: catalysts
Replies: 3
Views: 400

catalysts

how do you identify a catalyst in a two step reaction?
by Kassandra Molina 2B
Sun Mar 18, 2018 8:34 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: cell diagram placement
Replies: 1
Views: 187

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?
by Kassandra Molina 2B
Sun Mar 18, 2018 8:30 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: mechanism differentiation
Replies: 2
Views: 215

mechanism differentiation

how do you differentiate between two mechanism using rate laws?
by Kassandra Molina 2B
Sun Mar 18, 2018 8:27 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: n: negative or positive
Replies: 2
Views: 375

n: negative or positive

So when you plug in n for the electron it corresponds to in equations will it always be negative?
by Kassandra Molina 2B
Sun Mar 18, 2018 8:21 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Conductor
Replies: 1
Views: 148

Conductor

When do you know when to use a conductor? And what side you would add it on a cell diagram?
by Kassandra Molina 2B
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: 198

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?
by Kassandra Molina 2B
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: 229

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.
by Kassandra Molina 2B
Sat Mar 17, 2018 6:01 am
Forum: Balancing Redox Reactions
Topic: Test 2
Replies: 2
Views: 186

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
by Kassandra Molina 2B
Sat Mar 17, 2018 5:40 am
Forum: Balancing Redox Reactions
Topic: reducing and oxidizing agents
Replies: 2
Views: 121

reducing and oxidizing agents

Why are reducing and oxidizing agents the opposites of reduction and oxidation?
by Kassandra Molina 2B
Sat Mar 17, 2018 1:46 am
Forum: Phase Changes & Related Calculations
Topic: Sign for compression vs expansion
Replies: 4
Views: 274

Sign for compression vs expansion

When using the equation for w=-P is it true that for compression the answer will be positive and for expansion it will be negative?
by Kassandra Molina 2B
Tue Mar 13, 2018 6:56 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Standard Hydrogen Electrode
Replies: 1
Views: 72

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...
by Kassandra Molina 2B
Fri Mar 09, 2018 6:49 pm
Forum: Balancing Redox Reactions
Topic: Oxidation Number
Replies: 4
Views: 149

Oxidation Number

The example of the textbook 14.1 says that Mn has an oxidation number of +7, where does this number come from?
by Kassandra Molina 2B
Tue Feb 13, 2018 6:38 pm
Forum: Calculating Work of Expansion
Topic: -w vs +w
Replies: 2
Views: 117

-w vs +w

Just to clarify: if work is positive that means expansion and if it is negative it means compression?
by Kassandra Molina 2B
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: 95

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.
by Kassandra Molina 2B
Sun Jan 21, 2018 1:05 am
Forum: Phase Changes & Related Calculations
Topic: Equations to know
Replies: 6
Views: 203

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?
by Kassandra Molina 2B
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: 88

8.37

Why is the enthalpy of vaporization for this problem 4.76 kJ of heat/0.579 mol (from solution manual)?
by Kassandra Molina 2B
Sat Jan 20, 2018 5:51 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: 8.5
Replies: 3
Views: 155

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?)
by Kassandra Molina 2B
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: 75

Example 8.7

Why is the equation to figure the change in enthalpy =(2mol)*q/n ? I understand the 2 mol comes from benzene but why do we have to do q/n?
by Kassandra Molina 2B
Tue Jan 16, 2018 1:04 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: K vs C
Replies: 6
Views: 195

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?
by Kassandra Molina 2B
Tue Nov 28, 2017 8:43 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE Box
Replies: 3
Views: 326

ICE Box

When determining the change in pressure, how do you know whether the "x" will be positive or negative? What determines this?
by Kassandra Molina 2B
Tue Nov 28, 2017 8:42 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE Box
Replies: 1
Views: 235

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?
by Kassandra Molina 2B
Wed Nov 22, 2017 2:50 am
Forum: Photoelectric Effect
Topic: Higher Frequency and Kinetic Energy [ENDORSED]
Replies: 5
Views: 282

Higher Frequency and Kinetic Energy [ENDORSED]

Higher frequency light always emits electrons with higher: kinetic energy or low kinetic energy?
Asking from Midterm Q3 D
by Kassandra Molina 2B
Wed Nov 22, 2017 2:38 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K and Kc
Replies: 7
Views: 259

K and Kc

What is the difference between using K and Kc?
by Kassandra Molina 2B
Wed Nov 22, 2017 2:37 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: "Phase"
Replies: 5
Views: 215

"Phase"

what does it mean for reactants and products to be in "phase"? What is a phase?
by Kassandra Molina 2B
Wed Nov 22, 2017 2:34 am
Forum: Dipole Moments
Topic: Dipole Moments
Replies: 2
Views: 173

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.
by Kassandra Molina 2B
Wed Nov 22, 2017 1:18 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Chemical Equilibrium
Replies: 2
Views: 131

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?
by Kassandra Molina 2B
Mon Nov 20, 2017 8:06 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Chapter 11 Reading
Replies: 1
Views: 94

Chapter 11 Reading

Can anyone tell me what means or refers to in the reading of chapter 11?
by Kassandra Molina 2B
Mon Nov 13, 2017 10:18 pm
Forum: Limiting Reactant Calculations
Topic: Limiting Reactant vs Theoretical Yield
Replies: 3
Views: 485

Limiting Reactant vs Theoretical Yield

What is the difference between a limiting reactant and a theoretical yield? Or are they the same?
by Kassandra Molina 2B
Mon Nov 13, 2017 10:09 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Cation & Anion Polarity
Replies: 3
Views: 468

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?
by Kassandra Molina 2B
Mon Nov 13, 2017 9:57 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Ionization energy
Replies: 2
Views: 204

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?
by Kassandra Molina 2B
Mon Nov 13, 2017 9:52 pm
Forum: Electronegativity
Topic: Electroegativity
Replies: 9
Views: 460

Electroegativity

How can you tell whether one compound is more electronegative than another one without using the electronegativity trend?
by Kassandra Molina 2B
Mon Nov 13, 2017 9:22 pm
Forum: Electronegativity
Topic: Isoelectronic [ENDORSED]
Replies: 11
Views: 547

Isoelectronic [ENDORSED]

What does it mean for elements to be isoelectronic?

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