Search found 53 matches
- Fri Mar 12, 2021 12:36 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ICE Chart Question
- Replies: 26
- Views: 1650
Re: ICE Chart Question
Yes you still do take it into consideration for the exponents.
- Fri Mar 12, 2021 12:35 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Acids & Bases
- Replies: 4
- Views: 383
Re: Acids & Bases
Danielle DIS2L wrote:H! these are my previous notes from a step up session about them! I hope that you find them helpful :)
thank you so much for sharing these notes! they're super helpful
- Fri Mar 12, 2021 12:31 pm
- Forum: Ideal Gases
- Topic: 5J.13 and Ideal Gas Law
- Replies: 8
- Views: 641
Re: 5J.13 and Ideal Gas Law
what exactly is the ideal gas law?
- Fri Mar 12, 2021 12:31 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Finding bond enthalpies
- Replies: 6
- Views: 505
Re: Finding bond enthalpies
Hi! We add them together (reactants + products) for bond enthalpies. We break the bonds in the reactants which is an endothermic process. Since it's endothermic, energy needs to be put into the system (makes it positive). In terms of the products, we form new bonds, so energy is released - an exoth...
- Fri Mar 12, 2021 12:28 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Irreversible vs. Reversible Work Functions
- Replies: 6
- Views: 535
Re: Irreversible vs. Reversible Work Functions
A reversible process is one in which both the system and its environment can return to exactly the states they were in by following the reverse path. An irreversible process is one in which the system and its environment cannot return together to exactly the states that they were in.
- Fri Mar 12, 2021 12:27 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Heat Capacity
- Replies: 10
- Views: 781
Re: Heat Capacity
Heat capacity is the amount of heat energy required to raise the temperature of a body a specified amount. In SI units, heat capacity (symbol: C) is the amount of heat in joules required to raise the temperature 1 Kelvin.
- Fri Mar 12, 2021 12:25 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Enthalpy vs Entropy
- Replies: 39
- Views: 3349
Re: Enthalpy vs Entropy
No such thing as a dumb question :) Enthalpy is the amount of internal energy contained in a compound whereas entropy is the amount of intrinsic disorder within the compound. Enthalpy is zero for elemental compounds such hydrogen gas and oxygen gas; therefore, enthalpy is nonzero for water (regardle...
- Fri Mar 12, 2021 12:24 pm
- Forum: Phase Changes & Related Calculations
- Topic: Vapor vs gas
- Replies: 121
- Views: 14642
Re: Vapor vs gas
Vapour is a mixture of two or more different phases at room temperature, these phases are liquid and gaseous phase. Gas usually contains a single thermodynamic state at room temperature. Vapour has a definite shape of the gaseous particles when observed under a microscope.
- Fri Mar 12, 2021 12:23 pm
- Forum: Phase Changes & Related Calculations
- Topic: State Property
- Replies: 71
- Views: 3473
Re: State Property
A state property is a quantity that is independent of how the substance was prepared. Examples of state properties are altitude, pressure, volume, temperature and internal energy.
- Sun Mar 07, 2021 11:19 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Negative Change in Entropy of the Universe
- Replies: 4
- Views: 500
Re: Negative Change in Entropy of the Universe
I am actually very confused on this concept as well
- Sun Mar 07, 2021 11:15 pm
- Forum: Student Social/Study Group
- Topic: Moving to Westwood soon. Which restaurants should I visit?
- Replies: 45
- Views: 3301
Re: Moving to Westwood soon. Which restaurants should I visit?
meet fresh boba! a little bit on the pricey side but their boba is pretty bomb :)
- Sun Mar 07, 2021 11:11 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3890762
Re: Post All Chemistry Jokes Here
How about the chemical workers… are they unionized?
- Sun Mar 07, 2021 11:10 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3890762
Re: Post All Chemistry Jokes Here
Don't trust atoms, they make up everything.
- Sun Mar 07, 2021 11:08 pm
- Forum: General Rate Laws
- Topic: Rate Constant
- Replies: 31
- Views: 1267
Re: Rate Constant
changing the temperature and/or the activation energy changes the rate constant
- Sun Mar 07, 2021 11:04 pm
- Forum: *Free Energy of Activation vs Activation Energy
- Topic: Temperature vs. activation energy
- Replies: 33
- Views: 2656
Re: Temperature vs. activation energy
The relationship between temperature and the reaction rate is proportional; if you increase the temperature, you increase the reaction rate
- Sun Feb 28, 2021 11:36 pm
- Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
- Topic: How Electricity is Quantified
- Replies: 3
- Views: 287
Re: How Electricity is Quantified
Electricity is the flow of electrons within a given system. It can be quantified using charge, current, and potential. Charge is a physical property of matter. Charge causes matter to experience force within a given electromagnetic field. Current is defined as the amount of charge that passes in a ...
- Sun Feb 28, 2021 11:35 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Standard Reduction Potential
- Replies: 4
- Views: 310
Re: Standard Reduction Potential
what exactly is the standard reduction potential? in simple terms :)
- Sun Feb 28, 2021 11:34 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: coulomb?
- Replies: 18
- Views: 1205
Re: coulomb?
A coulomb is the SI unit of electric charge, equal to the quantity of electricity conveyed in one second by a current of one ampere.
- Sun Feb 28, 2021 11:32 pm
- Forum: Student Social/Study Group
- Topic: Chemistry News
- Replies: 135
- Views: 174048
Re: Chemistry News
some fun facts about electrochemistry :)
https://kids.kiddle.co/Electrochemistry
https://kids.kiddle.co/Electrochemistry
- Sun Feb 28, 2021 11:31 pm
- Forum: General Rate Laws
- Topic: Unique Reaction Rates [ENDORSED]
- Replies: 45
- Views: 165479
Re: Unique Reaction Rates [ENDORSED]
What does a unique reaction rate mean again?
- Sun Feb 21, 2021 11:57 pm
- Forum: Administrative Questions and Class Announcements
- Topic: 14B Enrollment [ENDORSED]
- Replies: 67
- Views: 18634
Re: 14B Enrollment [ENDORSED]
Does anyone know when the course Disability Studies 101W will be offered? I dont think it was offered for this spring 2021
- Sun Feb 21, 2021 11:56 pm
- Forum: Administrative Questions and Class Announcements
- Topic: 14B Enrollment [ENDORSED]
- Replies: 67
- Views: 18634
Re: 14B Enrollment [ENDORSED]
What exactly is the order of the chem series classes? Like what comes after Chem 14A and Chem 14B?
- Sun Feb 21, 2021 11:54 pm
- Forum: Phase Changes & Related Calculations
- Topic: Figuring out which one is oxidation and reductionand 5e-
- Replies: 3
- Views: 404
Re: Figuring out which one is oxidation and reductionand 5e-
I believe the 5e- is for trying to cancel out both sides of the reaction.
- Sun Feb 21, 2021 11:52 pm
- Forum: Phase Changes & Related Calculations
- Topic: Standard reduction potential E
- Replies: 2
- Views: 288
Re: Standard reduction potential E
I thought the anode and cathode weren't necessarily things we move but rather distinct areas of the circuit that indicate electron flow? Can someone clarify this please? Thank you!
- Sun Feb 21, 2021 11:50 pm
- Forum: Phase Changes & Related Calculations
- Topic: Voltage difference
- Replies: 9
- Views: 860
Re: Voltage difference
Would voltage difference be something we have to calculate on the final?
- Sun Feb 21, 2021 11:50 pm
- Forum: Phase Changes & Related Calculations
- Topic: oxidation number change
- Replies: 7
- Views: 675
Re: oxidation number change
I think Lavelle covered it but I dont exactly remember. What exactly is the oxidation number and when is it altered?
Thank you in advance for your help!
Thank you in advance for your help!
- Sun Feb 21, 2021 11:48 pm
- Forum: Student Social/Study Group
- Topic: Culinary Chemistry
- Replies: 239
- Views: 41039
Re: Culinary Chemistry
This is so fascinating, I am not much of a cook myself but I definitely want to start to cook and make connections to the chemistry we're learning because it sounds super dope.
- Sun Feb 21, 2021 11:47 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student - Part II [ENDORSED]
- Replies: 298
- Views: 304928
Re: Advice from a Medical Student - Part II [ENDORSED]
This is truly so informative and inspiring, thank you so much for your advice
- Sat Feb 06, 2021 3:23 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Entropy definition
- Replies: 37
- Views: 2713
Re: Entropy definition
how many types of entropy are there? & what exactly is positional (residual) entropy?
- Sat Feb 06, 2021 2:51 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Entropy definition
- Replies: 37
- Views: 2713
Re: Entropy definition
I believe he explained this in lecture but can someone explain why entropy is a maximum at equilibrium?
- Sat Feb 06, 2021 11:19 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Work
- Replies: 4
- Views: 357
Re: Work
What exactly does it mean when work is positive? Thank you in advance for your help :)
- Sat Jan 30, 2021 2:59 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Ways of Changing the Energy in the System
- Replies: 5
- Views: 225
Re: Ways of Changing the Energy in the System
After watching the lecture from 01/27/21, I was left confused on what is mean by doing work on the system/ let the system do work on the surroundings and how that affects the energy that is in the system. I feel that this concept is very important and I want to make sure I understand it. Hope someo...
- Sat Jan 30, 2021 2:56 pm
- Forum: Phase Changes & Related Calculations
- Topic: Endothermic v. Exothermic
- Replies: 139
- Views: 17617
Re: Endothermic v. Exothermic
Why is bond formation exothermic again?
- Sat Jan 30, 2021 2:52 pm
- Forum: Calculating Work of Expansion
- Topic: Integral
- Replies: 9
- Views: 630
Re: Integral
It has already been answered but I agree :) it is because the volume is changing as well. We are only dealing with gases when it comes to volume decompression
- Sat Jan 30, 2021 2:50 pm
- Forum: Calculating Work of Expansion
- Topic: Systems at Equilibrium
- Replies: 3
- Views: 198
Re: Systems at Equilibrium
I think that in a reversible process, every intermediate state between the extremes is an equilibrium state, regardless of the direction of the change. In contrast, an irreversible process is one in which the intermediate states are not equilibrium states, so change occurs spontaneously in only one ...
- Sat Jan 30, 2021 2:29 pm
- Forum: Calculating Work of Expansion
- Topic: Calculating work given pathways
- Replies: 2
- Views: 174
Re: Calculating work given pathways
What exactly does Lavelle mean when he said "more work is being done on the system"?
Thank you!
Thank you!
- Sun Jan 24, 2021 11:52 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Neutral Solution
- Replies: 9
- Views: 821
Re: Neutral Solution
what exactly is autoprotolysis?
- Sun Jan 24, 2021 11:50 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Bond enthalpies and phase changes
- Replies: 6
- Views: 239
Re: Bond enthalpies and phase changes
whats the connection between enthalpy and Hess's law?
- Sun Jan 24, 2021 11:49 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Bond enthalpies and phase changes
- Replies: 6
- Views: 239
Re: Bond enthalpies and phase changes
can someone explain the significance of phase changes?
- Sun Jan 24, 2021 11:48 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Open Systems
- Replies: 15
- Views: 918
Re: Open Systems
which equations work on closed systems?
- Sun Jan 24, 2021 11:47 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Open Systems
- Replies: 15
- Views: 918
Re: Open Systems
what is the difference between open and closed systems?
- Sun Jan 17, 2021 11:44 pm
- Forum: Phase Changes & Related Calculations
- Topic: Determining Stronger Acids
- Replies: 18
- Views: 811
Re: Determining Stronger Acids
I think the smaller the pKa, the stronger the acid.
- Sun Jan 17, 2021 11:35 pm
- Forum: Ideal Gases
- Topic: PV=nRT
- Replies: 74
- Views: 5142
Re: PV=nRT
P=Pressure V=Volume n= #moles
R= gas constant
T= temp
R= gas constant
T= temp
- Sun Jan 17, 2021 11:23 pm
- Forum: Ideal Gases
- Topic: Q and K relationship
- Replies: 22
- Views: 885
Re: Q and K relationship
Does anyone have any mnemonics to remember the Q and K relationship better? Hi, Here is a really nice one I learned in one of the workshop sessions: When you write it in terms of K first, then the sign points to the direction the reaction proceeds - if K>Q, reaction proceeds towards the products/fa...
- Sun Jan 17, 2021 11:21 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Remembering Le Chatelier's Principle
- Replies: 6
- Views: 1523
Re: Remembering Le Chatelier's Principle
Some that I feel are easy to remember are that when you add more reactants, equilibrium will shift right (reactants will decrease while products increase); when you add more products, equilibrium will shift left (products will decrease while reactants increase); when you remove reactants, equilibri...
- Sun Jan 17, 2021 11:19 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: When would K be unchanged?
- Replies: 31
- Views: 1316
Re: When would K be unchanged?
Daria Obukhova 2B wrote:The only thing that should cause a change in K value is temperature.
Do you know the more specific definition of why temperature is the only thing that causes a change in K value?
- Sun Jan 17, 2021 11:16 pm
- Forum: Ideal Gases
- Topic: R Value
- Replies: 17
- Views: 764
Re: R Value
What exactly is the complete definition of the R value?
- Sat Dec 05, 2020 8:39 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: polar v nonpolar molecules
- Replies: 30
- Views: 2642
Re: polar v nonpolar molecules
How would you differentiate polar and nonpolar molecules? Polar molecules occur when there is an electronegativity difference between the bonded atoms. Nonpolar molecules occur when electrons are shared equal between atoms of a diatomic molecule or when polar bonds in a larger molecule cancel each ...
- Sat Dec 05, 2020 8:27 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination Numbers
- Replies: 8
- Views: 556
Re: Coordination Numbers
Coordination numbers are the numbers of bonds ligands forms with the transitional metal. Basically, they are the number of ligands bonded to TM. If you are still confused I think you should rewatch the Monday lecture (specifically the coordination compound part), Dr. Lavelle goes into dept about co...
- Sat Dec 05, 2020 8:25 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: chelating ligands [ENDORSED]
- Replies: 51
- Views: 100407
Re: chelating ligands [ENDORSED]
Hi!
Perhaps someone else has already asked this but I was wondering, what exactly is a chelating ligand? :(
Perhaps someone else has already asked this but I was wondering, what exactly is a chelating ligand? :(
- Sat Dec 05, 2020 8:23 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 621919
Re: Saying Thank You to Dr. Lavelle
Dear Dr. Lavelle, Thank you so much for always making the smile in the beginning of lecture,AND at the end of lecture. The simplicity of this is very dear to my heart. A smile goes a very long way, especially during these frightening times, so thank you so much. Warm Regards, Lorena Morales Sandoval
- Sat Dec 05, 2020 8:21 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student - Part II [ENDORSED]
- Replies: 298
- Views: 304928
Re: Advice from a Medical Student - Part II [ENDORSED]
I love your story! super inspiring to see how different and unique every person's journey is, especially yours. thank you so much for sharing <3
- Sat Oct 10, 2020 5:29 pm
- Forum: General Science Questions
- Topic: Textbook
- Replies: 9
- Views: 629
Re: Textbook
Im not sure if anyone has had this problem but I bought the Sapling program a while ago and my access codes have not been mailed to me, and I have not been able to access the homework. Is anyone in a similar situation? If so, is there a sort of extension for the homework in this case? Also, to confi...