## Search found 30 matches

Tue Mar 12, 2019 3:12 pm
Forum: Second Order Reactions
Topic: amounts of reactant and its affect on rate
Replies: 6
Views: 178

### Re: amounts of reactant and its affect on rate

yes, and it all comes down the the ^2 in the rate equation of a second order reaction
Tue Mar 12, 2019 3:10 pm
Forum: Calculating Work of Expansion
Topic: Work
Replies: 8
Views: 502

### Re: Work

most of the equations will be given to us on the equation sheet, and it is important to know which one to use in a given situation
Tue Mar 12, 2019 3:08 pm
Forum: General Rate Laws
Topic: slow step
Replies: 11
Views: 567

### Re: slow step

the k value is the rate constant in the rate equation, so if the rate constant is small, then the rate is slow
Tue Mar 12, 2019 3:07 pm
Forum: Ideal Gases
Topic: Approximations for ICE
Replies: 20
Views: 524

### Re: Approximations for ICE

when k is less than 10^-3, then we can assume that x is small enough to not have an effect in the math
Tue Mar 12, 2019 3:05 pm
Forum: Phase Changes & Related Calculations
Topic: joules conversion factor
Replies: 7
Views: 511

### Re: joules conversion factor

its on the equation sheet. just make sure to leave the answer in whatever unit the question specifies
Tue Mar 12, 2019 3:04 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: internal energy
Replies: 3
Views: 148

### Re: internal energy

isothermal reactions have a deltaU of 0. not sure about reversible or irreversible
Tue Feb 26, 2019 1:15 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Change in enthalpy
Replies: 2
Views: 119

### Re: Change in enthalpy

it doesn't always favor the reverse reaction. When enthalpy is positive and entropy is negative, then the reaction favors the reverse. However when enthalpy is positive and entropy is also positive, the sign of Delta G depends on the temperature. You would use the equation "DeltaG= DeltaH - T(D...
Tue Feb 26, 2019 1:11 am
Forum: Balancing Redox Reactions
Topic: redox potential
Replies: 1
Views: 56

### Re: redox potential

when K, the equilibrium constant, is 1
Tue Feb 26, 2019 1:09 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams
Replies: 2
Views: 90

### Re: Cell Diagrams

they are the same states
Mon Feb 25, 2019 11:59 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Voltaic vs galvanic cell
Replies: 2
Views: 71

### Re: Voltaic vs galvanic cell

i'm pretty sure they are interchangeable. not 100% though
Mon Feb 25, 2019 11:57 pm
Forum: Balancing Redox Reactions
Topic: OH or H20
Replies: 2
Views: 98

### Re: OH or H20

when balancing half reactions, h20 will generally be used to balance oxygen, but when in a basic environment, OH should then be used to balance the excess hydrogen
Mon Feb 25, 2019 12:46 am
Forum: Balancing Redox Reactions
Topic: balancing redox reactions
Replies: 2
Views: 144

### Re: balancing redox reactions

the important thing is to balance any non hydrogen or oxygen first, and then balance oxygen with H20. Then balance the hydrogen with protons (H+). then balance the charges with electrons. once you add the equations back, you can cancel opposing charges in an acidic environment. There is an extra ste...
Mon Feb 25, 2019 12:30 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Spontaneous?
Replies: 13
Views: 394

### Re: Spontaneous?

with a negative deltaG, it indicates that the second state of the reaction, in other words the products, are favored so therefore the reaction is spontaneous
Mon Feb 25, 2019 12:20 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: What is E?
Replies: 4
Views: 155

### Re: What is E?

the standard reaction potentials of say a copper zinc (Cu/Zn) battery can be used to find the voltage of the battery. given the standard reaction potentials of the components of the redox reaction, you would add and subtract based on whether they are products or reactants to find the voltage. A posi...
Mon Feb 25, 2019 12:15 am
Forum: Van't Hoff Equation
Topic: When to apply the Van't Hoff Equation
Replies: 5
Views: 373

### Re: When to apply the Van't Hoff Equation

the Van't Hoff equation can be used to find the equilibrium constant of the reaction while the gibb's free energy equation can be used to find deltaG, which can then determine if the reaction is spontaneous or not
Mon Feb 25, 2019 12:12 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Spontaneous and unstable
Replies: 4
Views: 417

### Re: Spontaneous and unstable

spontaneous refers to the deltaG being negative in a reaction, which means that the reaction is product favored. not 100% sure how this is any different from an unstable reaction
Thu Feb 21, 2019 10:33 am
Forum: Balancing Redox Reactions
Topic: Week 7 Homework
Replies: 15
Views: 467

### Re: Week 7 Homework

gibbs free energy and maybe explore electrochem more
Thu Feb 21, 2019 10:31 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Pt as an electrode
Replies: 4
Views: 150

### Re: Pt as an electrode

Platinum is an inert electrode which means it will not interfere or react with the chemical redox reaction and skew results
Thu Feb 21, 2019 8:25 am
Forum: Balancing Redox Reactions
Topic: Weekly Homework
Replies: 3
Views: 151

### Re: Weekly Homework

on the syllabus there is a list of book problems under the section they correspond with. Each week you have to choose 7 do complete and turn in during your discussion session
Thu Feb 21, 2019 8:23 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy Meaning
Replies: 6
Views: 281

### Re: Gibbs Free Energy Meaning

When deltaG is negative, the reaction is spontaneous which means that under the current conditions, the reaction is favorable and will produce the products
Thu Feb 21, 2019 8:20 am
Forum: Phase Changes & Related Calculations
Topic: heat of a phase change
Replies: 5
Views: 204

### Re: heat of a phase change

Depending on what unit the question is asking for, you can use moles x delta H or mass x delta H.
Wed Feb 13, 2019 3:25 pm
Forum: Calculating Work of Expansion
Topic: Change in moles
Replies: 3
Views: 150

### Re: Change in moles

yes because delta nRT is an alteration of the ideal gas law
Wed Feb 13, 2019 3:20 pm
Forum: Administrative Questions and Class Announcements
Topic: breakdown of midterm?
Replies: 4
Views: 169

### Re: breakdown of midterm?

probably gonna be equilibrium and acid/base for about half and thermo for the other half
Wed Feb 13, 2019 3:18 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Heat and Entropy
Replies: 3
Views: 148

### Re: Heat and Entropy

multiple steps allow you to figure out the values all components necessary to use the formula
Wed Feb 13, 2019 3:16 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Ideal Gases
Replies: 2
Views: 143

### Re: Ideal Gases

ideal gases assume all contact is completely elastic, which in a real gas is not true. This would have a slight effect on pressure so we use ideal gases simply because they are predictable and easy to work with
Wed Feb 13, 2019 3:14 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Equations
Replies: 3
Views: 131

### Re: Equations

any equations that involve enthalpy, internal energy, work, entropy, and heat. The ideal gas law as well
Wed Feb 13, 2019 3:11 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: difference in states
Replies: 6
Views: 399

### Re: difference in states

yes the different systems affect the temp and volume and the pressure etc.
Mon Jan 28, 2019 10:45 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 4.C.3
Replies: 1
Views: 90

### Re: 4.C.3

That is the gas constant for the units given.
Sun Jan 13, 2019 6:49 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: affect change in pressure has on concentration
Replies: 2
Views: 58

### Re: affect change in pressure has on concentration

I am not 100% sure what the question is, but i can clear up Le Chatelier's Principle when it comes to volume and pressure's effects on concentration. A change in pressure will not affect the equilibrium constant of the reaction, but it can change the direction that the reaction shifts. The pressure ...
Sun Jan 13, 2019 6:37 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Tables
Replies: 2
Views: 142

### Re: ICE Tables

Often when posed a question where an ICE table is necessary, you will be given initial concentrations for either the reactants or the products. And as for using variables for the change, a reaction in equilibrium allows you to assume the change (lets call it "x") in reactants is the same a...

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