Search found 31 matches

by AditiSax
Sun Mar 17, 2019 10:24 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Wmax
Replies: 3
Views: 396

Wmax

What must we do in order to have the greatest Wmax in a cell?
by AditiSax
Sun Mar 17, 2019 5:11 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Platinum Electrode
Replies: 2
Views: 167

Platinum Electrode

What are the conditions under which we require a platinum electrode? The textbook details:
- when oxidised and reduced species are in the same solution
-for gas/ion electrode reactions
Are there any other situations?
by AditiSax
Sun Mar 17, 2019 4:49 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Disorder
Replies: 1
Views: 210

Disorder

How can we define positional and thermal disorder, and how do we identify which of the two is predominant in a system?
by AditiSax
Sun Mar 17, 2019 4:46 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Reaction Profiles
Replies: 2
Views: 235

Reaction Profiles

In drawing and labelling reaction profiles of reaction mechanisms with multiple intermediates:

In cases where we do not have data on relative stability of the intermediates, how are we expected to draw the peaks?
by AditiSax
Sun Mar 17, 2019 3:18 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalysts and pathways
Replies: 2
Views: 211

Catalysts and pathways

How are we supposed to calculate the factor by which a rate of reaction changes as a result of a change in temperature?
by AditiSax
Sat Mar 16, 2019 10:28 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy
Replies: 1
Views: 186

Enthalpy

In calculations for enthalpy change, when do we use moles and when do we use grams?
by AditiSax
Sun Mar 10, 2019 11:27 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Selective discharging of ions
Replies: 1
Views: 61

Selective discharging of ions

How are we supposed to predict which ions preferentially discharge at an electrode? Is this based on the values?
by AditiSax
Sun Mar 10, 2019 11:21 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Indicators
Replies: 1
Views: 65

Indicators

How do we explain how indicators work based on concepts we have learned from equilibrium? I understand that they are weak acids or bases that exist in equilibrium (example below) but how could we explain equilibrium shifts to indicate the acidity/basicity of a medium based on color change? HI{n}\lef...
by AditiSax
Sun Mar 10, 2019 11:15 pm
Forum: General Rate Laws
Topic: Collision Theory
Replies: 1
Views: 55

Collision Theory

How can we relate collision theory to the likeliness of a lower order reaction being higher than a higher order reaction?
by AditiSax
Sun Mar 10, 2019 11:13 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Born-Haber Cycles
Replies: 1
Views: 50

Born-Haber Cycles

Are we required to learn how to construct born-haber cycles? If so, are we allowed to combine steps? How much information will be provided to us?
by AditiSax
Sun Mar 10, 2019 10:01 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius plot
Replies: 4
Views: 85

Arrhenius plot

What is the relevance of having the axes of the arrhenius plot be lnk and 1/T?
by AditiSax
Sun Mar 10, 2019 9:58 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Maxwell Boltzmann Distribution Curve
Replies: 1
Views: 56

Maxwell Boltzmann Distribution Curve

How can we represent the change to the curve caused by increasing or decreasing the temperature? How would the normal curve compare to the changed curved (higher/lower temp) at the activation energy?
by AditiSax
Sun Mar 10, 2019 9:56 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Determination of Reaction Rates
Replies: 1
Views: 84

Determination of Reaction Rates

How can we determine the reaction rate experimentally when
1. a gas is produced in a reaction
2. if there is a change in concentration of hydronium ions
3. if there is a change in concentration of ions
4. if the reactants or products are colored
by AditiSax
Sun Mar 10, 2019 9:52 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Activation Energy
Replies: 7
Views: 286

Activation Energy

How can we define activation energy and represent it using energy profile diagrams?
by AditiSax
Mon Mar 04, 2019 8:39 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Galvanic Cells
Replies: 4
Views: 87

Galvanic Cells

Why must galvanic cells work in a thermodynamically reversible manner?
by AditiSax
Mon Mar 04, 2019 8:38 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Galvanic Cells
Replies: 4
Views: 107

Galvanic Cells

Why do galvanic cells stop working after a period of time?
by AditiSax
Wed Feb 27, 2019 11:16 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Entropy based on shape of molecule
Replies: 3
Views: 99

Entropy based on shape of molecule

How are we supposed to predict which form of a certain molecule possesses the lower residual entropy based on their positional disorder? (cis vs. trans)
by AditiSax
Sun Feb 24, 2019 11:53 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Maxwell Boltzmann Distribution Curve [ENDORSED]
Replies: 1
Views: 59

Maxwell Boltzmann Distribution Curve [ENDORSED]

How do we go about explaining how maxwell boltzmann distribution is graphically represented?
by AditiSax
Sun Feb 24, 2019 11:51 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Reaction Quotient [ENDORSED]
Replies: 1
Views: 225

Reaction Quotient [ENDORSED]

How is the reaction quotient relevant to us with regards to application in word problems in:
1. chemical equilibrium
2. electrochemistry
by AditiSax
Sun Feb 24, 2019 11:48 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Salt Bridges
Replies: 3
Views: 66

Salt Bridges

Why are salt bridges made of an inert electrolyte? What is usually used?
by AditiSax
Sun Feb 03, 2019 4:59 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Spontaneity of Exo and Endo reactions
Replies: 4
Views: 95

Spontaneity of Exo and Endo reactions

Are exothermic reactions more likely to be spontaneous than endothermic reactions?
by AditiSax
Sun Feb 03, 2019 4:57 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Predicting Spontaneity
Replies: 4
Views: 136

Predicting Spontaneity

For the free energy equation , do we only know how to predict spontaneity simply based on high/low temperatures in part with positive/negative values of ? Are there any conceptual explanations that we need to know with regards to this?
by AditiSax
Sun Feb 03, 2019 4:48 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpy defintions
Replies: 2
Views: 54

Enthalpy defintions

How can we define the enthalpies of solutions and hydration?
by AditiSax
Sun Jan 20, 2019 11:11 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 6th edition 12.45
Replies: 1
Views: 71

Re: 6th edition 12.45

Hey! I think for the sake of our testing, this extra explanation isn't necessary. But, what it is basically implying is the trend that we can pick up from the previous one mentioned. Aniline, an arylamine (has a benzene ring attached to the amine group) is weaker than ammonia which is weaker than bo...
by AditiSax
Sun Jan 20, 2019 10:45 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Polyprotic Acids and Bases 12.79
Replies: 2
Views: 80

Re: Polyprotic Acids and Bases 12.79

Set up an ICE table as Dr. Lavelle has demonstrated in lecture, with the initial concentration of sulfuric acid as 0.15M and the initial concentrations of hydronium ions and conjugate base as both 0. The change in the concentration of sulfuric acid would be -x and the changes in H30+ and HSO4- would...
by AditiSax
Sun Jan 20, 2019 10:40 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Acids and Bases
Replies: 3
Views: 85

Re: Acids and Bases

Looking at the Bronsted-Lowry definition, we can regard those that donate or lose protons as acids, and those that accept protons as bases.
by AditiSax
Sun Jan 13, 2019 11:16 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Equilibrium in relation to K and Q
Replies: 5
Views: 94

Re: Equilibrium in relation to K and Q

K is solved using concentrations of reactants and products at equilibrium. Q is solved using concentrations of reactants and products when the system is not necessarily in equilibrium, and can be compared to K to determine in which direction the equilibrium will "sit."
by AditiSax
Sun Jan 13, 2019 11:09 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Le Chatelier's Principle
Replies: 2
Views: 40

Re: Le Chatelier's Principle

A change in pressure is essentially a change in concentration. Eventually the system will re-establish equilibrium in response to a change in concentration of products or reactant. A change in temperature, however, is a change in the rate constants of the forward or backward reactions.
by AditiSax
Sun Jan 13, 2019 10:37 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Exothermic and Endothermic Reactions
Replies: 1
Views: 52

Exothermic and Endothermic Reactions

For Le Chatelier's principle regarding the effect of temperature changes, are we also responsible for energy profile diagrams? Can we simply explain the way in which the equilibrium shifts based on whether the reaction is exothermic or endothermic or do we need more to support our answer?

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