Search found 35 matches
- Tue Mar 17, 2020 10:57 pm
- Forum: Ideal Gases
- Topic: Kc vs Kp
- Replies: 109
- Views: 4369
Re: Kc vs Kp
Kc is used when molarity is given. When it comes to gas you only use Kp when given partial pressures or asked to convert to partial pressures.
- Tue Mar 17, 2020 10:50 pm
- Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Topic: Understanding Entropy
- Replies: 4
- Views: 422
Understanding Entropy
Can someone explain why Lavelle didn't like to say define entropy as "disorder?"
- Tue Mar 17, 2020 9:35 pm
- Forum: Balancing Redox Reactions
- Topic: Cathode and Anode
- Replies: 24
- Views: 1529
Re: Cathode and Anode
We want the ECell to be positive in order to do work because once the Ecell is equal to zero then that is when the battery is considered to be "dead."
- Tue Mar 17, 2020 9:16 pm
- Forum: Balancing Redox Reactions
- Topic: Pt in Cell Diagram
- Replies: 14
- Views: 872
Re: Pt in Cell Diagram
I had asked my TA about when to use Pt(s) or when to use C(gr) and she recommended to just go with using Pt(s).
- Tue Mar 17, 2020 9:13 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Ecell Potential
- Replies: 3
- Views: 328
Ecell Potential
What changes would result in changes in the Ecell potential?
- Sun Mar 15, 2020 7:52 am
- Forum: Zero Order Reactions
- Topic: What do each orders mean
- Replies: 7
- Views: 545
Re: What do each orders mean
How is the denotation for the three versions different?
- Sun Mar 15, 2020 7:43 am
- Forum: General Rate Laws
- Topic: Differential rate law
- Replies: 1
- Views: 193
Differential rate law
When are we expected to use the differential rate law?
- Sat Mar 14, 2020 12:46 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Electromotive force
- Replies: 2
- Views: 148
Electromotive force
Can someone explain what an electromotive force is? Also, does anyone remember what day it was talked about in lecture, if it was discussed in lecture.
- Fri Mar 13, 2020 9:32 pm
- Forum: Calculating Work of Expansion
- Topic: Ideal gas
- Replies: 7
- Views: 633
Ideal gas
What should we be thinking about when we come across "ideal gas?"
- Fri Mar 13, 2020 9:10 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Delta S total
- Replies: 6
- Views: 340
Delta S total
What's the method to calculate doe total entropy?
- Tue Mar 10, 2020 10:34 pm
- Forum: Ideal Gases
- Topic: Acids and Basis: Salts
- Replies: 9
- Views: 611
Acids and Basis: Salts
How does one calculate the pH of a weak acid and its salt?
- Thu Mar 05, 2020 2:31 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Inert Metals
- Replies: 4
- Views: 326
Inert Metals
Can someone specify when one should use Pt(s) or C(gr) as our inert metal. Or should we just always assume that we should use Pt(s)?
- Tue Mar 03, 2020 1:33 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6N.9 Homework
- Replies: 1
- Views: 154
6N.9 Homework
A tin electrode in 0.015 m Sn(NO3)2(aq) is connected to a hydrogen electrode in which the pressure of H2 is 1.0 bar. If the cell potential is 0.061 V at 25 8C, what is the pH of the electrolyte at the hydrogen electrode? --> When given Sn(NO3)2(aq) how does one know that it is going to be Sn --> Sn2...
- Sun Mar 01, 2020 11:18 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6M.5
- Replies: 2
- Views: 135
6M.5
When given the equation: 2Hg^+2 Br- --> Hg2 ^+2 + Br2
For the half-reaction, do the electrons (2e-) go on the reaction side of the equation? If so, can someone explain why?
2e- 2Hg^+2--> Hg2
For the half-reaction, do the electrons (2e-) go on the reaction side of the equation? If so, can someone explain why?
2e- 2Hg^+2--> Hg2
- Sat Feb 29, 2020 11:45 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Calculating the value of n (6L.1)
- Replies: 2
- Views: 230
Calculating the value of n (6L.1)
Hello, I understand that n is a the number of moles of electron being transferred in a redox reaction, but I can't understand why for question 6L.1 part a) the value of n=2.
For the half reaction I got 2Ce(4+)-->2Ce(+3) + 1e but I can't figure balance 3I- --> I(3)-
For the half reaction I got 2Ce(4+)-->2Ce(+3) + 1e but I can't figure balance 3I- --> I(3)-
- Sat Feb 29, 2020 10:19 pm
- Forum: Balancing Redox Reactions
- Topic: 6K.3 D)
- Replies: 2
- Views: 210
6K.3 D)
How is Cl2 acting as both a oxidizing and reducing agent? Also, why does the half-reaction Cl2(g) --> 2Cl-, where did the Cl- come from?
- Thu Feb 27, 2020 2:26 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Example 6L.2
- Replies: 1
- Views: 111
Example 6L.2
Can someone explain why in example 6L.2 when writing the reacting for a cell Pt(s) │ H2(g) │ HCl(aq) │ Hg2Cl2(s) │ Hg(l) the oxidation is written as
1/2 H2( g ) --> H+( aq) + 2e- ? Is the reason HCL not used because it's highly acidic and will dissociate completely?
1/2 H2( g ) --> H+( aq) + 2e- ? Is the reason HCL not used because it's highly acidic and will dissociate completely?
- Thu Feb 27, 2020 12:15 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Additional resources: Thermodynamics
- Replies: 5
- Views: 460
Additional resources: Thermodynamics
Can anyone recommend any additional resources on Thermodynamics? I feel like I have a general idea but consuming more information would be a great benefit for me! Thanks in advance!
- Wed Feb 12, 2020 4:34 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: State Functions
- Replies: 4
- Views: 351
State Functions
Can someone share the acronym that was shared during the review session to remember what our state functions are?
- Sun Jan 26, 2020 11:12 pm
- Forum: Phase Changes & Related Calculations
- Topic: Differentiating (q) and (w)
- Replies: 4
- Views: 168
Differentiating (q) and (w)
What's a defining factor of q (heat) and w (work)?
- Wed Jan 22, 2020 9:12 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: equilibrium constants and solubility
- Replies: 1
- Views: 202
equilibrium constants and solubility
How do we use equilibrium constants to predict solubility?
- Mon Jan 20, 2020 4:25 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: pKa of conjugate acid relating to strength of base
- Replies: 2
- Views: 201
pKa of conjugate acid relating to strength of base
My friend and I are having trouble understanding the homework question 6C.13.
Can someone please clarify what the question is asking? We were given pKa and we decided from the question to solve for pKb, but now were are unsure what these values mean and how we should rank them.
Thanks in advance!
Can someone please clarify what the question is asking? We were given pKa and we decided from the question to solve for pKb, but now were are unsure what these values mean and how we should rank them.
Thanks in advance!
- Sun Jan 12, 2020 11:50 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Q=K
- Replies: 14
- Views: 603
Q=K
I'm confused has to why Q=K when Q is supposed to representative of a system that has not yet reached equilibrium?
- Wed Jan 08, 2020 10:23 pm
- Forum: Ideal Gases
- Topic: Understanding Q
- Replies: 19
- Views: 671
Understanding Q
When solving for Q do we omit solids and pure liquids, like when solving for K?
- Wed Jan 08, 2020 2:06 pm
- Forum: Ideal Gases
- Topic: Understanding Q
- Replies: 13
- Views: 472
Understanding Q
When calculating for Q do we omit solids and pure liquids as well?
- Wed Jan 08, 2020 2:02 pm
- Forum: Ideal Gases
- Topic: Solids and Liquids
- Replies: 7
- Views: 405
Solids and Liquids
Can someone further explain why we leave out solids and liquids when calculating K?
- Sun Dec 08, 2019 10:08 pm
- Forum: Biological Examples
- Topic: Biological Function
- Replies: 2
- Views: 268
Biological Function
What atom was it exactly that was displaced by cisplatunum.
- Sun Dec 01, 2019 11:59 pm
- Forum: Lewis Acids & Bases
- Topic: Difference
- Replies: 4
- Views: 351
Difference
Are we going to be tested on the different types of acids?
- Sun Nov 24, 2019 7:53 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Fac and Mer isomers
- Replies: 2
- Views: 142
Fac and Mer isomers
Are we going to need to know fac and mer isomers as well as cis and trans?
- Sun Nov 17, 2019 10:30 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Understanding longer molecule VSPER shapes.
- Replies: 3
- Views: 222
Understanding longer molecule VSPER shapes.
Some questions on the homework gave us longer molecules to determine their molecular geometry, how do we go at doing so if they aren't our typical PCl₅?
- Sun Nov 10, 2019 10:24 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Differentiation
- Replies: 1
- Views: 77
Differentiation
What is teller when deciding if a molecule is linear or angular.
- Sun Nov 03, 2019 5:29 pm
- Forum: DeBroglie Equation
- Topic: When to use the DeBroglie equation?
- Replies: 6
- Views: 351
Re: When to use the DeBroglie equation?
Also, an important note to remember is that as the mass increases them the wave-length of the mass gets smaller.
- Sun Oct 20, 2019 11:19 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Probability of finding an electron at a certain location
- Replies: 4
- Views: 241
Probability of finding an electron at a certain location
This was a topic that was in a reading (under Topic 1D), but I can't remember if it was discussed in lecture and also there wasn't any homework problems regarding this topic. Is this something that we are going to need to know for any exams? If so, is this something that can be brought up during dis...
- Sun Oct 13, 2019 11:20 pm
- Forum: DeBroglie Equation
- Topic: De Broglie's Equation
- Replies: 13
- Views: 476
Re: De Broglie's Equation
Can you use De Broglie’s equation to find the wavelength in regards to electrons?
- Mon Oct 07, 2019 12:35 am
- Forum: Limiting Reactant Calculations
- Topic: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
- Replies: 68
- Views: 6581
Re: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
Are we going to be expected to know how to write the formula for something like "magnesium sulfate heptahydrate," for example, for the test in our discussions? Or will we just be given chemical symbols?