## Search found 33 matches

Sat Mar 16, 2019 1:33 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: delta U
Replies: 4
Views: 260

### Re: delta U

Yes
Fri Mar 08, 2019 2:20 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: how much of catalyst do we need to know? [ENDORSED]
Replies: 4
Views: 318

### Re: how much of catalyst do we need to know?[ENDORSED]

Just that they speed up reaction rate by lowering activation energy
Fri Mar 08, 2019 2:19 pm
Forum: Zero Order Reactions
Topic: initial concentration
Replies: 6
Views: 149

### Re: initial concentration

The reactant concentrations just dont affect rate.
Fri Mar 08, 2019 2:18 pm
Forum: Second Order Reactions
Topic: Final
Replies: 30
Views: 564

### Re: Final

It is cumulative and includes all material we learned
Fri Mar 08, 2019 2:18 pm
Forum: *Enzyme Kinetics
Topic: Enzymes
Replies: 8
Views: 642

### Re: Enzymes

Enzymes have activation sites that fit substrates in and make reactions faster.
Fri Mar 08, 2019 2:17 pm
Forum: Zero Order Reactions
Topic: Reactions Orders
Replies: 2
Views: 81

### Re: Reactions Orders

We might have to solve for the order for certain questions.
Fri Mar 08, 2019 2:16 pm
Forum: General Rate Laws
Topic: Rate Laws
Replies: 8
Views: 125

### Re: Rate Laws

They will give you derivations on the test i believe.
Mon Feb 25, 2019 2:01 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Meaning of E
Replies: 3
Views: 100

### Re: Meaning of E

One is standard and obtained experimentally. One is something you get from circumstance and compare to the standard. like Q vs K
Mon Feb 25, 2019 1:59 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Anode and Cathode
Replies: 6
Views: 87

### Re: Anode and Cathode

anode is oxidized and contributes electrons whereas cathode is reduced
Mon Feb 25, 2019 1:59 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: E standard
Replies: 3
Views: 83

### Re: E standard

E standard is obtained experimentally
Thu Feb 21, 2019 12:20 am
Forum: Calculating Work of Expansion
Topic: Expansion Against a Vacuum
Replies: 4
Views: 124

### Re: Expansion Against a Vacuum

Yes that is an irreversible system.
Thu Feb 21, 2019 12:20 am
Forum: Calculating Work of Expansion
Topic: Work
Replies: 8
Views: 340

### Re: Work

Look at the given units and variables
Thu Feb 21, 2019 12:19 am
Forum: Calculating Work of Expansion
Topic: expansion
Replies: 2
Views: 78

### Re: expansion

If energy is expended for expansion or as heat
Fri Feb 15, 2019 2:05 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: 3/2R vs 5/2R
Replies: 8
Views: 197

### Re: 3/2R vs 5/2R

When it is constant pressure or constant volume. Or based on the shape of the molecules.
Fri Feb 15, 2019 2:05 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Calculating Delta S with a change in temperature
Replies: 5
Views: 133

### Re: Calculating Delta S with a change in temperature

You can change the variables to include temperature its just that temperature is inverse.
Fri Feb 15, 2019 2:04 pm
Forum: Calculating Work of Expansion
Topic: S=0
Replies: 12
Views: 483

### Re: S=0

Entropy is equal to zero in a perfect crystal at T= 0K
Tue Feb 12, 2019 2:48 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat Capacity
Replies: 4
Views: 95

### Re: Heat Capacity

Yes that is convertible and equivalent
Tue Feb 12, 2019 2:47 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: hess law equations
Replies: 3
Views: 105

### Re: hess law equations

The equations will most likely be given on the exam.
Tue Feb 12, 2019 2:46 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Example 8.3 sixth edition
Replies: 3
Views: 96

### Re: Example 8.3 sixth edition

The changes in kelvin are the same as the changes in celsius.
Mon Jan 28, 2019 3:52 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Replies: 4
Views: 85

### Re: Adiabatic and diathermic walls

Its more conceptual than something which we would need to know how to calculate
Mon Jan 28, 2019 3:51 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Cp and Cv
Replies: 5
Views: 315

### Re: Cp and Cv

They are used for different conditions and questions
Mon Jan 28, 2019 3:50 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's Law
Replies: 3
Views: 95

### Re: Hess's Law

You can add the reaction equations together along with their values of enthalpy
Mon Jan 28, 2019 3:49 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Neutralization reactions
Replies: 6
Views: 102

### Re: Neutralization reactions

No it can be endothermic in certain situations
Mon Jan 28, 2019 3:48 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy signs
Replies: 13
Views: 201

### Re: Enthalpy signs

Its positive when the reaction is endothermic and negative when it is exothermic
Mon Jan 28, 2019 3:48 pm
Forum: Phase Changes & Related Calculations
Topic: Standard entalpy of formation
Replies: 6
Views: 127

### Re: Standard entalpy of formation

Chemicals in their most stable form in which they cant be broken down anymore have a standard enthalpy of formation of 0
Mon Jan 21, 2019 4:39 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Net ionic equation
Replies: 2
Views: 33

### Re: Net ionic equation

Yeah just cancel out all the ions and then recalculate the equation.
Mon Jan 21, 2019 4:29 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Q and K
Replies: 10
Views: 229

### Re: Q and K

Q is like a hypothetical reaction and K is an established equilibrium constant
Mon Jan 21, 2019 4:27 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kp vs Kc
Replies: 7
Views: 130

### Re: Kp vs Kc

Kp applies to pressure and Kc applies to concentration
Mon Jan 21, 2019 4:26 pm
Forum: Ideal Gases
Topic: 5% rule
Replies: 12
Views: 337

### Re: 5% rule

I think each component of X should comply to the 5% rule.
Sun Jan 13, 2019 2:48 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc and Kp
Replies: 5
Views: 89

### Re: Kc and Kp

You use Kp for gases and when pressure can be involved and Kc for aqueous solutions where mostly only concentration is concerned.
Sun Jan 13, 2019 2:47 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: True or False regarding reaction mixture [ENDORSED]
Replies: 10
Views: 157

### Re: True or False regarding reaction mixture[ENDORSED]

Yeah the concentrations stay the same because the forward and reverse occur at the same rate.
Sun Jan 13, 2019 2:44 pm
Forum: Ideal Gases
Topic: Denoting brackets/parentheses
Replies: 9
Views: 171

### Re: Denoting brackets/parentheses

Brackets are for concentration and parentheses are for states of matter and other things within chemical notation I think.
Sun Jan 13, 2019 2:37 pm
Forum: Ideal Gases
Topic: Denoting brackets/parentheses
Replies: 9
Views: 171

### Re: Denoting brackets/parentheses

Brackets are for concentration and parentheses are for states of matter and other things within chemical notation I think.