Search found 31 matches
- Sat Mar 17, 2018 7:10 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Creating Cell Diagrams
- Replies: 1
- Views: 300
Re: Creating Cell Diagrams
adding onto this, does the order of X/Y have any significance in determining if species X and Y are being oxidized or reduced?
- Sat Mar 17, 2018 6:38 pm
- 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: 484
Re: Test 2 #3
What K value were we supposed to get as the answer?
- Sat Mar 17, 2018 4:56 pm
- Forum: Calculating Work of Expansion
- Topic: Free energy and work
- Replies: 3
- Views: 466
Free energy and work
What is the relationship between free energy and work?
- Sat Mar 17, 2018 4:53 pm
- Forum: Van't Hoff Equation
- Topic: Van't Hoff
- Replies: 9
- Views: 1107
Re: Van't Hoff
Do we have to know the van't Hoff equation for the final?
- Sat Mar 17, 2018 3:58 pm
- Forum: Phase Changes & Related Calculations
- Topic: Homework Problem 8.21
- Replies: 10
- Views: 6709
Re: Homework Problem 8.21
I think the equation goes (Tf-Ti) so for the Copper side it should be (T-100), because both the water and Copper should have the same final temperature at equilibrium. This will yield the 24.8 degrees C.
- Sat Mar 17, 2018 3:04 pm
- Forum: Phase Changes & Related Calculations
- Topic: Standard States
- Replies: 2
- Views: 459
Standard States
How do you know when a substance is in its standard state?
- Mon Mar 12, 2018 12:29 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2763016
Re: Post All Chemistry Jokes Here
Hey do you have any sodium bromide?
Na BrO
Na BrO
- Mon Mar 12, 2018 12:14 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2763016
Re: Post All Chemistry Jokes Here
I tell bad chemistry jokes because all the good ones Ar.
- Mon Mar 12, 2018 12:07 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalyst Example from lecture 3/12
- Replies: 3
- Views: 531
Catalyst Example from lecture 3/12
In the ozone example about homogeneous catalysts in lecture today, which species is actually the catalyst?
- Mon Mar 12, 2018 11:08 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Intermediates
- Replies: 6
- Views: 728
Re: Intermediates
To be an intermediate, the species just needs to cancel out within the set of reaction steps given. Reaction coefficients are also important when checking to see if things cancel out!
- Mon Mar 12, 2018 9:51 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: 15.51
- Replies: 6
- Views: 898
Re: 15.51
To determine the exponents we would need some experimental data.
- Mon Mar 12, 2018 9:47 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: HW 15.49
- Replies: 5
- Views: 985
Re: HW 15.49
What's an example of a situation when an intermediate would be considered in the overall rate law?
- Sun Mar 11, 2018 3:54 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: K
- Replies: 7
- Views: 838
Re: K
k can be changed by altering the temperature or activation energy.
- Sun Mar 11, 2018 3:51 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: slow reaction mechanisms
- Replies: 4
- Views: 510
Re: slow reaction mechanisms
The overall reaction rate will be determined by the slowest step.
- Sun Mar 11, 2018 3:47 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: 0 order
- Replies: 6
- Views: 2546
Re: 0 order
A zero order reaction has a linear graph with a negative slope.
- Sun Mar 11, 2018 3:45 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Using pre-equilibrium approach
- Replies: 3
- Views: 346
Re: Using pre-equilibrium approach
Should we always start problems using the pre-equilibrium approach?
- Sun Mar 11, 2018 3:42 pm
- Forum: Second Order Reactions
- Topic: molecularity
- Replies: 6
- Views: 891
Re: molecularity
You can determine molecularity by the number of molecules of reactants.
- Sun Mar 11, 2018 3:37 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Energy barrier
- Replies: 3
- Views: 374
Re: Energy barrier
I think the higher the energy barrier, the slower the step will be because the barrier is harder to overcome.
- Sun Mar 11, 2018 3:35 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: What is Molecularity?
- Replies: 9
- Views: 2428
Re: What is Molecularity?
Is there a maximum molecularity that we'll deal with in this class?
- Sun Mar 11, 2018 3:33 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Molecularity and Coefficients
- Replies: 3
- Views: 973
Re: Molecularity and Coefficients
Molecularity just has to do with the number of molecules coming together, rather than the type/identity of the molecules.
- Sun Mar 11, 2018 3:25 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Rate-determining slowest step
- Replies: 5
- Views: 1162
Re: Rate-determining slowest step
I believe that the rates will be given along with the mechanism, and we can determine the slowest step from that.
- Sun Mar 04, 2018 12:57 pm
- Forum: First Order Reactions
- Topic: Pseudo-1st-Order
- Replies: 6
- Views: 803
Re: Pseudo-1st-Order
Will we be expected to be able to apply this concept on the test and/or final?
- Sun Feb 11, 2018 4:48 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Standard Conditions and Temperature
- Replies: 5
- Views: 1274
Re: Standard Conditions and Temperature
Also, how should we know when to leave answers in terms of J vs. kJ?
- Sun Feb 11, 2018 4:47 pm
- Forum: Balancing Redox Reactions
- Topic: Reduction and Oxidation
- Replies: 4
- Views: 473
Re: Reduction and Oxidation
Is it necessary to memorize the oxidation numbers for some elements?
- Sun Feb 11, 2018 4:45 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: cell diagram (hw14.11)
- Replies: 3
- Views: 410
Re: cell diagram (hw14.11)
How do you know which direction things move through the salt bridge?
- Sun Jan 21, 2018 7:13 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Heat Capacity Properties
- Replies: 3
- Views: 359
Re: Heat Capacity Properties
Specific heat capacity (grams) and molar heat capacity (mols) both depend on the amount of substance present, making them extensive properties.
- Sun Jan 21, 2018 7:07 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Enthalpy
- Replies: 3
- Views: 323
Re: Enthalpy
The enthalpy of a system is the total amount of heat present in it.
- Sun Jan 21, 2018 7:04 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Intensive vs. Extensive
- Replies: 3
- Views: 583
Re: Intensive vs. Extensive
An extensive property relies on the amount of matter present while an intensive property relies on the type of matter present.
- Sun Jan 14, 2018 11:48 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Standard States
- Replies: 4
- Views: 1131
Re: Standard States
It may be helpful just to remember the two that are liquids (mercury and bromine) and that the noble gases plus F, N, O, and Cl are gases and the rest are solids.
- Sun Jan 14, 2018 11:41 pm
- Forum: Phase Changes & Related Calculations
- Topic: Temperature and Heat
- Replies: 4
- Views: 466
Re: Temperature and Heat
Temperature stays constant during a phase change because the heat energy is being used to change the state of the reactant instead of raising the temperature.
- Sun Jan 14, 2018 11:36 pm
- Forum: Phase Changes & Related Calculations
- Topic: Steam burning more than water question
- Replies: 4
- Views: 343
Re: Steam burning more than water question
I think steam burns more than liquid water because when steam hits the skin it undergoes a phase change (to liquid) which releases a ton of energy into the skin.