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: 712
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: 718
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: 672
Re: initial concentration
The reactant concentrations just dont affect rate.
- Fri Mar 08, 2019 2:18 pm
- Forum: Second Order Reactions
- Topic: Final
- Replies: 32
- Views: 2478
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: 1721
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: 391
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: 726
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: 1201
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: 629
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: 421
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: 700
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: 954
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: 333
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: 2104
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: 611
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: 1809
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: 442
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: 368
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: 422
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
- Topic: Adiabatic and diathermic walls
- Replies: 4
- Views: 487
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: 859
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: 354
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: 863
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: 1743
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: 1058
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: 167
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: 833
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: 772
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: 3474
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: 306
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: 834
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: 2209
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: 2209
Re: Denoting brackets/parentheses
Brackets are for concentration and parentheses are for states of matter and other things within chemical notation I think.