## 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: 185

### 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: 311

### 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: 271

### 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: 670

### 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: 6
Views: 3176

### 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: 279

### 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: 8241
Views: 1437468

### Re: Post All Chemistry Jokes Here

Hey do you have any sodium bromide?
Na BrO
Mon Mar 12, 2018 12:14 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8241
Views: 1437468

### 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: 256

### 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: 372

### 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: 386

### 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: 616

### 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: 439

### 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: 282

### 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: 2206

### 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: 166

### 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: 562

### 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: 137

### 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: 1277

### 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: 331

### 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: 434

### 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: 434

### 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: 826

### 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: 227

### 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: 205

### 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: 176

### 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: 212

### 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: 424

### 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: 391

### 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: 319

### 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: 217

### 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.