Search found 51 matches

by EllieSchmidtke_4I
Tue Mar 17, 2020 9:33 pm
Forum: Balancing Redox Reactions
Topic: Pt in Cell Diagram
Replies: 10
Views: 169

Re: Pt in Cell Diagram

Pt(s) can be added at the ends of a cell diagram to indicate an electrode present in the reaction.
by EllieSchmidtke_4I
Tue Mar 17, 2020 9:32 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: n of concentration cell
Replies: 3
Views: 86

Re: n of concentration cell

"n" refers to the number of electrons transferred in the redox reaction.
by EllieSchmidtke_4I
Tue Mar 17, 2020 9:31 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Kelvin or Celsius?
Replies: 47
Views: 959

Re: Kelvin or Celsius?

Use Kelvin since this is the SI unit for temperature.
by EllieSchmidtke_4I
Mon Mar 16, 2020 4:23 pm
Forum: Student Social/Study Group
Topic: Number of Chemistry Community Posts
Replies: 33
Views: 715

Re: Number of Chemistry Community Posts

So we only have to have 50 posts total for the quarter to get full credit, not necessarily 5 per week?
by EllieSchmidtke_4I
Mon Mar 16, 2020 12:25 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: adding platinum
Replies: 8
Views: 94

Re: adding platinum

This is needed when there’s not already a solid present.
by EllieSchmidtke_4I
Mon Mar 16, 2020 12:24 pm
Forum: Administrative Questions and Class Announcements
Topic: final grades
Replies: 12
Views: 252

Re: final grades

Ivan Tadeja 1G wrote:In addition to being able to see our grades, does anyone also know if we will be able to review our answers? I would like to see the questions I got wrong.

How will we be able to see these? Is he releasing the final exams online?
by EllieSchmidtke_4I
Sun Mar 15, 2020 11:15 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: H2O
Replies: 8
Views: 102

Re: H2O

H2O should only be included if its in gaseous {H2O(g)} form.
by EllieSchmidtke_4I
Sun Mar 15, 2020 11:14 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy Ionization
Replies: 2
Views: 66

Gibbs Free Energy Ionization

How is calculating the standard gibbs free energy of ionization different than just calculating regular standard gibbs free energy?
by EllieSchmidtke_4I
Sun Mar 15, 2020 11:11 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: reverse half reaction
Replies: 4
Views: 115

Re: reverse half reaction

The equation that is reversed is the anode (oxidized) reaction.
by EllieSchmidtke_4I
Sun Mar 15, 2020 11:11 pm
Forum: General Rate Laws
Topic: Axes labels
Replies: 6
Views: 105

Axes labels

What are the axes labels of a graph of a second order reaction?
by EllieSchmidtke_4I
Sun Mar 15, 2020 11:10 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Doing work vs work done
Replies: 8
Views: 124

Re: Doing work vs work done

Doing work on the system results in a positive w value, whereas the system doing work results in a negative w value.
by EllieSchmidtke_4I
Sun Mar 08, 2020 9:37 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Anode as [product] and cathode as [reactant]?
Replies: 3
Views: 37

Anode as [product] and cathode as [reactant]?

When calculating K as [product]/[reactant], why would the anode be used as the product and the cathode be used as the reactant?
by EllieSchmidtke_4I
Sun Mar 08, 2020 9:30 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Vertical lines vs commas
Replies: 7
Views: 32

Re: Vertical lines vs commas

A vertical line is for separating components of different states, whereas a comma separates components of the same state.
Ex: (s)|(g) versus (aq),(aq)
by EllieSchmidtke_4I
Sun Mar 08, 2020 9:28 pm
Forum: Zero Order Reactions
Topic: Identifying Zero vs. First vs. Second Order Reactions
Replies: 7
Views: 66

Identifying Zero vs. First vs. Second Order Reactions

How can you identify zero, first, and second order reactions?
by EllieSchmidtke_4I
Sun Mar 08, 2020 9:20 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: K < >
Replies: 8
Views: 78

Re: K < >

K is determined by the ratio of [products] to [reactants].
by EllieSchmidtke_4I
Sun Mar 08, 2020 9:19 pm
Forum: General Rate Laws
Topic: Rate limiting step
Replies: 12
Views: 94

Re: Rate limiting step

The rate limiting step can be calculated using the stoichiometric coefficients.
by EllieSchmidtke_4I
Sun Mar 01, 2020 7:12 pm
Forum: Balancing Redox Reactions
Topic: Oxidizing/reducing agent
Replies: 18
Views: 206

Re: Oxidizing/reducing agent

An oxidizing agent allows its counterpart in the equation to be oxidized (oxidizing agent=reduced component), and a reducing agent allows its counterpart in the equation to be reduced (reducing agent=oxidized counterpart).
by EllieSchmidtke_4I
Sun Mar 01, 2020 7:08 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams
Replies: 6
Views: 50

Re: Cell Diagrams

I don't think they would make us draw out the galvanic cell diagrams but they might test us on the understanding of writing out the cell diagram, ie: Al(s) | Al3+(aq) || Sn2+(aq) | Sn(s) Hi, Could you explain what this cell diagram is telling us conceptually? I’m a bit confused about that. Thank yo...
by EllieSchmidtke_4I
Sun Mar 01, 2020 7:03 pm
Forum: Balancing Redox Reactions
Topic: H+ or H2O
Replies: 4
Views: 43

Re: H+ or H2O

H+ and H2O are used to balance the H and O one both sides of the equation in acidic reactions, whereas OH- and H2O are used to balance the H and O one both sides of the equation in basic reactions.
by EllieSchmidtke_4I
Sun Mar 01, 2020 6:51 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6L.1
Replies: 1
Views: 23

6L.1

For 6L.1 (a), where does the value n=2 come from? I know n=the number of electrons, but I don't understand where the number 2 specifically comes from?
by EllieSchmidtke_4I
Wed Feb 26, 2020 5:51 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Test 2 Homework Problems to Study [ENDORSED]
Replies: 1
Views: 56

Test 2 Homework Problems to Study [ENDORSED]

Which practice problems on Outline 4 correspond to the concepts on the second page of the outline?
by EllieSchmidtke_4I
Sun Feb 23, 2020 9:04 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cathode vs Anode
Replies: 11
Views: 103

Re: Cathode vs Anode

The oxidation half-reaction occurs at the anode, whereas the reduction half-reaction occurs at the anode.
by EllieSchmidtke_4I
Sun Feb 23, 2020 9:01 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: l vs ll
Replies: 5
Views: 35

Re: l vs ll

One line represents interface between phases in contact with each other (such as a porous disk/wall), whereas two lines represents a salt bridge.
by EllieSchmidtke_4I
Sun Feb 23, 2020 8:58 pm
Forum: Balancing Redox Reactions
Topic: Balancing Redox Equations
Replies: 7
Views: 57

Re: Balancing Redox Equations

Components that gain electrons are being reduced, and components that are losing electrons are being oxidized.
by EllieSchmidtke_4I
Sun Feb 23, 2020 8:57 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2
Replies: 5
Views: 66

Re: Test 2

Test 2 covers the second page of Outline 4 and all of Outline 5 that is posted on Lavelle's Chem 14B website.
by EllieSchmidtke_4I
Tue Feb 18, 2020 7:31 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Standard Gibbs Free Energy Conditions
Replies: 4
Views: 52

Standard Gibbs Free Energy Conditions

When calculating standard free energy, is T=0K or 298K (25 degrees Celcius)?
by EllieSchmidtke_4I
Tue Feb 18, 2020 7:26 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Constant R
Replies: 15
Views: 245

Re: Constant R

Which version of the gas constant (R) applies to your equation depends on the units present in the equation.
by EllieSchmidtke_4I
Sat Feb 08, 2020 3:13 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Lowest Energy Forms
Replies: 1
Views: 28

Lowest Energy Forms

For the midterm, are we required to memorize the lowest energy forms of molecules? If so, which should we memorize?
by EllieSchmidtke_4I
Sat Feb 08, 2020 3:10 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Molecular Complexity
Replies: 4
Views: 61

Re: Molecular Complexity

More complex molecules have a higher entropy value due to having an increased number of rotational/positional energies.
by EllieSchmidtke_4I
Sun Feb 02, 2020 9:41 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated system
Replies: 10
Views: 146

Re: Isolated system

An isolated system would be a closed, thermal-resistant water bottle (i.e. a Hydroflask). This is because both mass and heat energy cannot exit the system.
by EllieSchmidtke_4I
Sun Feb 02, 2020 9:32 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Changing energy
Replies: 2
Views: 50

Re: Changing energy

Changing energy in an open system can be done through mass flow, heat, and work. However, only heat and work can change the energy in closed systems.
by EllieSchmidtke_4I
Sun Feb 02, 2020 9:31 pm
Forum: Ideal Gases
Topic: Temperature
Replies: 17
Views: 151

Re: Temperature

Since Kelvin is the SI units for temperature, it is ideal to convert your answer to Kelvin.
by EllieSchmidtke_4I
Sun Feb 02, 2020 9:23 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Partial Pressure
Replies: 7
Views: 93

Re: Partial Pressure

Partial pressure is the pressure exerted by an individual gas in a reaction. All partial pressures together in a reaction equal the total pressure of the system.
by EllieSchmidtke_4I
Sun Feb 02, 2020 9:21 pm
Forum: Ideal Gases
Topic: PV=nRT
Replies: 12
Views: 161

Re: PV=nRT

P=pressure, v=volume, n=moles of gas, R=the gas constant, T=temperature
by EllieSchmidtke_4I
Sun Feb 02, 2020 9:17 pm
Forum: Calculating Work of Expansion
Topic: Integrals
Replies: 1
Views: 23

Re: Integrals

This is because we can't calculate internal energy (U), only the change in internal energy (delta U). Therefore, we have to take the derivative of all of the variables in the equation for change in internal energy, then take the integral to find the internal energy.
by EllieSchmidtke_4I
Sat Jan 25, 2020 3:41 pm
Forum: Phase Changes & Related Calculations
Topic: Phase changes
Replies: 7
Views: 50

Re: Phase changes

Temperature remains constant during phase changes because the energy that would be released/required to change temperature is instead being used to change the phase.
by EllieSchmidtke_4I
Sat Jan 25, 2020 3:36 pm
Forum: Phase Changes & Related Calculations
Topic: State Functions - Heat vs. Temperature
Replies: 2
Views: 31

State Functions - Heat vs. Temperature

Why is temperature a state function but heat isn't?
by EllieSchmidtke_4I
Sat Jan 25, 2020 3:29 pm
Forum: Administrative Questions and Class Announcements
Topic: Chem Community Questions Due Date
Replies: 2
Views: 38

Re: Chem Community Questions Due Date

lilymayek_1E wrote:chem community question are always due on sunday (11:59pm) I'm almost positive; that was the due date last quarter & I always posted before then and got full credit!


Thanks!
by EllieSchmidtke_4I
Sat Jan 25, 2020 3:27 pm
Forum: Administrative Questions and Class Announcements
Topic: Chem Community Questions Due Date
Replies: 2
Views: 38

Chem Community Questions Due Date

For each week, when should our five questions be posted by? I have been posting mine on the Saturday following each week, and just want to make sure I'll still recieve full credit.
by EllieSchmidtke_4I
Sat Jan 25, 2020 3:22 pm
Forum: Phase Changes & Related Calculations
Topic: Endothermic and Exothermic
Replies: 13
Views: 90

Re: Endothermic and Exothermic

To proceed in the forward direction, endothermic systems require heat while exothermic systems release heat.
by EllieSchmidtke_4I
Sat Jan 25, 2020 3:08 pm
Forum: Phase Changes & Related Calculations
Topic: Lecture Notes Last Friday 1/17/20
Replies: 2
Views: 37

Re: Lecture Notes Last Friday 1/17/20

Same, I can send you the notes also since I'm also in lecture 4. As mentioned above, there were no new concepts, just example problems to reiterate the concepts we already learned.
by EllieSchmidtke_4I
Sat Jan 18, 2020 1:44 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE and quadratic formula
Replies: 11
Views: 94

Re: ICE and quadratic formula

You can make your calculations quicker without having to use the quadratic formula when you approximate x. When Ka or Kb is small enough, x can be assumed to be insignificantly small in comparison to the initial concentration of weak acid or base given. As a result, rather than writing out the init...
by EllieSchmidtke_4I
Sat Jan 18, 2020 1:39 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Peer Learning Worksheets
Replies: 3
Views: 75

Re: Peer Learning Worksheets

How many worksheets have been given out so far? Is it possible to get the past worksheets if we go to the sessions this week?
by EllieSchmidtke_4I
Sat Jan 18, 2020 1:36 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Defining Le Chatelier's Principle
Replies: 3
Views: 27

Re: Defining Le Chatelier's Principle

Le Chatelier's Principle:
When stress is applied to a system at dynamic equilibrium, the equilibrium will shift to minimize the effect of the stress.
by EllieSchmidtke_4I
Sat Jan 18, 2020 1:32 pm
Forum: Ideal Gases
Topic: Ideal Gas Law
Replies: 5
Views: 61

Re: Ideal Gas Law

I think the equation, PV=nRT, is more helpful in this class for understanding the proportionality between variables that influence the equilibrium constant k. For instance, as V decreases and thus P increases, their will be fewer mols of gas in your equation, which will affect k.
by EllieSchmidtke_4I
Sat Jan 18, 2020 1:28 pm
Forum: Administrative Questions and Class Announcements
Topic: How was my Friday class/lecture?
Replies: 4
Views: 71

Re: How was my Friday class/lecture?

Going over examples helped me understand more about ICE tables.
by EllieSchmidtke_4I
Sat Jan 11, 2020 5:23 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Adding inert gas [ENDORSED]
Replies: 9
Views: 96

Re: Adding inert gas [ENDORSED]

According to the book, the inert gas increases the total pressure within a reaction vessel. The reacting gases, however, will still occupy the same volume, meaning their concentrations and partial pressures remain the same despite the inert gas. Thus, the introduction of the inert gas has no effect...
by EllieSchmidtke_4I
Sat Jan 11, 2020 5:11 pm
Forum: Ideal Gases
Topic: Pa and bar? [ENDORSED]
Replies: 3
Views: 35

Re: Pa and bar? [ENDORSED]

I don't think we are required to use a specific unit, just as long as you keep the units consistent throughout a given problem.
by EllieSchmidtke_4I
Sat Jan 11, 2020 5:08 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5H.3
Replies: 4
Views: 43

Re: 5H.3

I believe the Cl2 is canceled out because the top two equations on the screenshot above are used as a reference for values, and therefore only the H/HCl and Br/BrCl components are necessary for solving for the equation in question.
by EllieSchmidtke_4I
Sat Jan 11, 2020 4:58 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Table 5G.2
Replies: 5
Views: 49

Re: Table 5G.2

For problem 5I.3, why would you use Kc = 160 from Table 5G.2 instead of Kc = 794 or Kc = 54?
by EllieSchmidtke_4I
Sat Jan 11, 2020 4:53 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE box
Replies: 9
Views: 82

Re: ICE box

No, because there is no such thing as a negative concentration.

Go to advanced search