Search found 43 matches
- Sun Feb 16, 2020 6:51 pm
- Forum: Balancing Redox Reactions
- Topic: Determining charge
- Replies: 5
- Views: 328
Re: Determining charge
I'm having a difficult determining this as well. I'm not sure if there is an easier way to do this, but the way I am finding it takes me a long time and I don't think I am doing it the correct way.
- Sun Feb 16, 2020 6:47 pm
- Forum: Balancing Redox Reactions
- Topic: redox reaction
- Replies: 10
- Views: 599
Re: redox reaction
An easy way to remember is: The LEO goes GER.
LEO: Lose Electrons Oxidation
GER: Gain Electrons Reduction
LEO: Lose Electrons Oxidation
GER: Gain Electrons Reduction
- Sun Feb 16, 2020 6:46 pm
- Forum: Balancing Redox Reactions
- Topic: Oxygen
- Replies: 9
- Views: 479
Re: Oxygen
Does anyone know an easier way of telling the oxidation or reduction number?
- Sun Feb 16, 2020 6:43 pm
- Forum: Balancing Redox Reactions
- Topic: Half reactions
- Replies: 7
- Views: 535
Re: Half reactions
A way of identifying redox reactions is : The LEO goes GER.
LEO: Lose Electrons Oxidation
GER: Gain Electrons Reduction
LEO: Lose Electrons Oxidation
GER: Gain Electrons Reduction
- Tue Feb 11, 2020 2:07 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Exam Loactions
- Replies: 1
- Views: 167
Exam Loactions
Can someone tell me where the midterm exam rooms are going to be? I’m not sure where to find that information. Thank you!
- Sun Feb 09, 2020 8:25 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: State Function
- Replies: 7
- Views: 498
Re: State Function
You can use it. You just have to make sure you arrange the equations to be equal to delta G.
- Sun Feb 09, 2020 8:23 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Weak acid/base
- Replies: 14
- Views: 702
Re: Weak acid/base
Does that mean that Ka and pKa are kind of opposite?
- Sun Feb 09, 2020 8:21 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Pizza Rolls REVIEW Session DOWNLOAD HERE
- Replies: 67
- Views: 5979
Re: Pizza Rolls REVIEW Session DOWNLOAD HERE
Thank you so much!!!
- Sun Feb 09, 2020 8:20 pm
- Forum: Calculating Work of Expansion
- Topic: Reversible vs Irreversible
- Replies: 3
- Views: 198
Re: Reversible vs Irreversible
I'm not too sure, but assume so.
- Sun Feb 09, 2020 8:19 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm Content
- Replies: 6
- Views: 389
Re: Midterm Content
It's everything but the 2nd page of the last outline he posted.
- Sat Feb 01, 2020 7:44 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Closed Systems
- Replies: 8
- Views: 444
Re: Closed Systems
For a closed system think of Pressure cooker or frying pan on stove with the lid on. For an isolated system think of a hydroflask.
- Sat Feb 01, 2020 7:39 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: isolated system
- Replies: 13
- Views: 644
Re: isolated system
Think of a hydroflask
- Sat Feb 01, 2020 7:36 pm
- Forum: Phase Changes & Related Calculations
- Topic: Open vs Isolated System
- Replies: 15
- Views: 1347
Re: Open vs Isolated System
Closed you can exchange with whats inside, while isolated you can't exchange at all.
- Sat Feb 01, 2020 1:17 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: units for reaction enthalpy and enthalpy of formation
- Replies: 3
- Views: 240
Re: units for reaction enthalpy and enthalpy of formation
I'm not too sure about my answer, but I believe that you can use them interchangeably.
- Sat Feb 01, 2020 1:15 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: q and delta H
- Replies: 2
- Views: 182
Re: q and delta H
Can someone thoroughly explain it please?
- Thu Jan 23, 2020 1:32 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ice table
- Replies: 13
- Views: 571
Re: ice table
You don’t include solids(s) or liquids(l).
- Thu Jan 23, 2020 12:34 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Test 1 Material
- Replies: 3
- Views: 217
Re: Test 1 Material
Does anyone know how many questions will be on the exam?
- Thu Jan 23, 2020 12:33 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 5% rule
- Replies: 13
- Views: 656
Re: 5% rule
I believe you use it when the number is very close to zero that it doesn’t make a difference to the overall answer
- Thu Jan 23, 2020 12:32 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: H20 in the ICE table
- Replies: 26
- Views: 1542
Re: H20 in the ICE table
Do not include H2O.
- Thu Jan 23, 2020 12:29 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: pH sig figs
- Replies: 9
- Views: 465
Re: pH sig figs
2 significant figures from the decimal.
- Thu Jan 23, 2020 12:28 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: n in -nFE
- Replies: 14
- Views: 900
Re: n in -nFE
The number of electrons transferred is what the n stands for.
- Fri Jan 17, 2020 7:44 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Conjugate Acids/Bases
- Replies: 2
- Views: 232
Re: Conjugate Acids/Bases
Acids increase the concentration of hydrogen ions and bases decrease the concentration of hydrogen ions. With that said, the relationship between them is through the concentration of hydrogen ions.
- Sun Feb 24, 2019 10:35 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: n in -nFE
- Replies: 14
- Views: 900
Re: n in -nFE
n is the number of electrons transferred.
- Sun Feb 24, 2019 10:31 pm
- Forum: Balancing Redox Reactions
- Topic: Salt Bridge
- Replies: 5
- Views: 458
Re: Salt Bridge
The importance of a salt bridge is to maintain charge balance since electrons are moving from one side of the bride to the other.
- Sun Feb 24, 2019 10:29 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Spontaneous?
- Replies: 13
- Views: 1597
Re: Spontaneous?
if delta s is positive the process will be spontaneous. if delta g is negative then it is exergonic meaning that it is spontaneous in the forward direction. if delta g is greater than 0 it is spontaneous in the reverse direction. delta h <0 and delta s>0 spontaneous delta h<0 and delta s spontaneous...
- Sun Feb 17, 2019 10:26 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: 6th edition
- Replies: 1
- Views: 201
6th edition
Does anyone know what problems start off with the gibbs free energy on the 6th edition?
- Sun Feb 17, 2019 10:25 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Graphs
- Replies: 2
- Views: 319
Graphs
Also, does anyone know how the graphs are going to be used on a homework problem or test?
- Sun Feb 17, 2019 10:24 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Endothermic and Exothermic Graphs
- Replies: 3
- Views: 1091
Endothermic and Exothermic Graphs
Can anyone explain to me the difference between these two graphs please?
- Sun Feb 10, 2019 8:47 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: 3rd Law of Thermodynamics
- Replies: 2
- Views: 293
3rd Law of Thermodynamics
Are the units for the 3rd law and the 2nd law different?
- Sun Feb 10, 2019 8:42 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: 6th edition 9.61
- Replies: 1
- Views: 200
6th edition 9.61
Can someone explain how they got the answer. I'm having trouble figuring out. Thank you!
- Sun Feb 10, 2019 8:41 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: 6th edition 9.7
- Replies: 1
- Views: 178
6th edition 9.7
Can anyone explain how to do this problem please? I tried solving but get a different answer every time. Thank you!
- Sun Feb 03, 2019 8:52 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Material on Midterm?
- Replies: 9
- Views: 877
Re: Material on Midterm?
I'm Pretty sure the exam will include some concepts of the 2nd and 3rd law of thermodynamics
- Sun Feb 03, 2019 8:50 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: 8.43 6th edition
- Replies: 1
- Views: 218
8.43 6th edition
Can someone help me with this problem and explain the overall concept of it please? My TA went over it in class but I didn't really understand it. Thank you!
- Sun Feb 03, 2019 12:21 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Week 4 HW
- Replies: 2
- Views: 429
Week 4 HW
Does any one know what chapters are we allowed to use for the homework this week?
- Sun Jan 27, 2019 2:37 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: 6th edition, 4A3 pt c
- Replies: 2
- Views: 267
Re: 6th edition, 4A3 pt c
I had this same problem and caused me lots of confusion. I would say to go with the 6th edition since it contains less errors.
- Sun Jan 27, 2019 2:35 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: 3 Methods to solve for Enthaply
- Replies: 3
- Views: 445
3 Methods to solve for Enthaply
Can anyone describe each method and when its appropriate to use them? thank you!
- Sun Jan 27, 2019 2:31 pm
- Forum: Phase Changes & Related Calculations
- Topic: Lecture 1/25
- Replies: 1
- Views: 278
Lecture 1/25
Is there any chance that someone could fill be in on what Dr.Lavelle went over towards the end of lecture? I had to leave early to attend a study session.
- Sun Jan 20, 2019 3:57 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Changes in K
- Replies: 4
- Views: 478
Re: Changes in K
Temperature changes the equilibrium constant. When temperature increases the Kp decreases.
- Sun Jan 20, 2019 3:56 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Le Chateliers Principle
- Replies: 4
- Views: 391
Re: Le Chateliers Principle
Changing the temperature will affect the equilibrium constant. When temperature increases the Kp decreases. The pressure doesn't necessarily change the equilibrium constant due to the position of equilibrium changes to maintain the constant value.
- Sun Jan 20, 2019 3:47 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Weak/Strong Acid and Bases
- Replies: 1
- Views: 195
Weak/Strong Acid and Bases
How can we determine whether it is a strong/weak acid and a strong/weak base?
- Sun Jan 13, 2019 1:57 pm
- Forum: Ideal Gases
- Topic: Units
- Replies: 19
- Views: 1216
Re: Units
You use Kelvin since R is in terms of Kelvin. If you were given a different temperature unit, you would have to convert it to Kelvin.
Example, 52 degrees Celsius to K.
C+273.15=K
52+273.15=300.15K
Example, 52 degrees Celsius to K.
C+273.15=K
52+273.15=300.15K
- Sun Jan 13, 2019 1:45 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Solving for K
- Replies: 7
- Views: 500
Re: Solving for K
You use parenthesis when solving/ using Kp and you use brackets when solving using Kc.
- Sun Jan 13, 2019 1:38 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kc and Kp
- Replies: 5
- Views: 306
Kc and Kp
How do we know when to use Kc and Kp? During discussion our TA wanted us to do the homework based on Kc even though the state of the equation was g.