Search found 29 matches

by Warda Sahib 2J
Thu Mar 15, 2018 7:52 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Cell Potential
Replies: 9
Views: 2285

Re: Cell Potential

They're the same, you can use either
by Warda Sahib 2J
Thu Mar 15, 2018 7:48 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: mass in q = m(c) delta t
Replies: 5
Views: 388

Re: mass in q = m(c) delta t

Specific heat capacity uses grams while Molar heat capacity uses moles
by Warda Sahib 2J
Thu Mar 15, 2018 7:45 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Units
Replies: 3
Views: 197

Re: Units

The units are in KJ/mol but KJ alone should also be ok
by Warda Sahib 2J
Thu Mar 15, 2018 7:44 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: What does R stand for?
Replies: 13
Views: 666

Re: What does R stand for?

R is the ideal gas constant.
by Warda Sahib 2J
Thu Mar 15, 2018 7:41 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 908079

Re: Post All Chemistry Jokes Here

A photon checks into a hotel and is asked if he needs any help with his luggage. He says, "No, I'm traveling light."
by Warda Sahib 2J
Thu Mar 15, 2018 7:38 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 908079

Re: Post All Chemistry Jokes Here

Have you heard the one about a chemist who was reading a book about helium?
He just couldn't put it down.
by Warda Sahib 2J
Thu Mar 15, 2018 7:36 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 908079

Re: Post All Chemistry Jokes Here

How often does a chemist like to hear jokes? Periodically.
by Warda Sahib 2J
Thu Mar 15, 2018 7:36 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 908079

Re: Post All Chemistry Jokes Here

Electron configuration? How BOHRing.
by Warda Sahib 2J
Thu Mar 15, 2018 7:35 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 908079

Re: Post All Chemistry Jokes Here

Have you heard about Agent 007 going to Antarctica? It was a polar Bond.
by Warda Sahib 2J
Thu Mar 15, 2018 7:30 pm
Forum: Phase Changes & Related Calculations
Topic: U = 3/2 nRT
Replies: 3
Views: 833

Re: U = 3/2 nRT

I don't think you will have to answer a question using that equation, but like the answer above states, it's helpful to see the relationship between U and T (the only nonconstants in the equation).
by Warda Sahib 2J
Thu Mar 15, 2018 7:28 pm
Forum: Phase Changes & Related Calculations
Topic: Reversible
Replies: 5
Views: 439

Re: Reversible

The reversible expansion does not have constant pressure, while the irreversible one does.
by Warda Sahib 2J
Thu Mar 15, 2018 7:27 pm
Forum: Phase Changes & Related Calculations
Topic: Environmental impact?
Replies: 6
Views: 422

Re: Environmental impact?

I don't think so, I think there were only be system/surroundings stuff that relate to the environment.
by Warda Sahib 2J
Mon Feb 12, 2018 7:03 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Cv vs. Cp [ENDORSED]
Replies: 13
Views: 966

Re: Cv vs. Cp [ENDORSED]

Cv-is when there's constant volume and Cp-is when there's constant pressure.
by Warda Sahib 2J
Mon Feb 12, 2018 7:00 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Sublimation
Replies: 3
Views: 209

Re: Sublimation

Enthalpy of Sublimation (solid to gas) is the sum of enthalpy of fusion and enthalpy of vaporization
by Warda Sahib 2J
Mon Feb 12, 2018 6:57 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Equations
Replies: 4
Views: 330

Equations

Does anyone know if we have to memorize all of the equations that are not on the Constants and Equations sheet?
by Warda Sahib 2J
Sun Feb 04, 2018 10:03 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat capacity [ENDORSED]
Replies: 4
Views: 145

Re: Heat capacity [ENDORSED]

No, I am assuming Professor Lavelle is proving those
by Warda Sahib 2J
Sun Feb 04, 2018 10:02 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Different Changes in Enthalpy symbols -ΔH
Replies: 3
Views: 213

Re: Different Changes in Enthalpy symbols -ΔH

ΔHc-enthalpy of combustion; ΔHL-lattice enthalpy; ΔHb is bond enthalpy.
by Warda Sahib 2J
Sun Feb 04, 2018 10:01 pm
Forum: Phase Changes & Related Calculations
Topic: The universe
Replies: 9
Views: 304

Re: The universe

Because no energy or matter can be transferred
by Warda Sahib 2J
Sun Feb 04, 2018 9:59 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy vs. Entropy
Replies: 4
Views: 153

Re: Enthalpy vs. Entropy

Entropy is a measure of disorder or randomness of a system. Enthalpy is defined as the sum of internal energy of a system and the product of the pressure and volume of the system.
by Warda Sahib 2J
Sun Jan 28, 2018 2:53 pm
Forum: Phase Changes & Related Calculations
Topic: Heat and Work relation
Replies: 6
Views: 234

Re: Heat and Work relation

No, the work doesn't necessarily have to be negative in this case.
by Warda Sahib 2J
Sun Jan 28, 2018 2:52 pm
Forum: Phase Changes & Related Calculations
Topic: Closed Systems [ENDORSED]
Replies: 8
Views: 459

Re: Closed Systems [ENDORSED]

Because energy is transferred in closed systems, adding or subtracting heat will affect the energy.
by Warda Sahib 2J
Sun Jan 28, 2018 2:49 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Question 8.31
Replies: 7
Views: 303

Re: Question 8.31

You can use either because adding 273 won't make a difference.
by Warda Sahib 2J
Sun Jan 21, 2018 9:07 pm
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 113
Views: 66345

Re: Rusty on High School Chem [ENDORSED]

I took chem 14a last quarter and I never took AP Chem in high school. Watching youtube videos on concepts I didn't understand really helped me.
by Warda Sahib 2J
Sun Jan 21, 2018 9:04 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hesss Law
Replies: 6
Views: 215

Re: Hesss Law

Yes, you will need to know these three techniques: Hess's law, Bond Enthalpies, Standard enthalpies of formation. The only one you don't have to worry about for the test is isothermal.
by Warda Sahib 2J
Sun Jan 21, 2018 9:01 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 3 Test Topic is endorsed
Replies: 37
Views: 1806

Re: Week 3 Test Topic is endorsed

Does Dr. Lavelle only test on things he's talked about?
by Warda Sahib 2J
Mon Jan 15, 2018 12:43 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's Law
Replies: 3
Views: 142

Hess's Law

What does Hess's law allow you to do?
by Warda Sahib 2J
Mon Jan 15, 2018 12:42 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpy
Replies: 2
Views: 138

Enthalpy

Given a forward reaction with positive enthalpy, will its reverse reaction be endothermic or exothermic?
by Warda Sahib 2J
Mon Jan 15, 2018 12:36 am
Forum: Limiting Reactant Calculations
Topic: Reactant vs. Reagent [ENDORSED]
Replies: 23
Views: 6924

Re: Reactant vs. Reagent [ENDORSED]

reactant: A substance participating in a chemical reaction, especially a directly reacting substance present at the initiation of the reaction.
reagent: A substance used in a chemical reaction to detect, measure, examine, or produce other substances.

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