Search found 32 matches
- Sat Mar 17, 2018 8:40 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: when exactly do you use the Arrhenius equation?
- Replies: 3
- Views: 627
when exactly do you use the Arrhenius equation?
what would make one recognize that the equation is needed?
- Sat Mar 17, 2018 8:39 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: how much of catalyst do we need to know? [ENDORSED]
- Replies: 4
- Views: 682
how much of catalyst do we need to know? [ENDORSED]
It was briefly went over in class once and thats it
- Sat Mar 17, 2018 8:36 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: how to find a microstate
- Replies: 2
- Views: 797
how to find a microstate
how do you find a microstate
- Sat Mar 17, 2018 8:33 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: what does W stand for in S=klnW
- Replies: 3
- Views: 7127
what does W stand for in S=klnW
This may seem dumb but i need a refresher
- Sat Mar 17, 2018 8:06 pm
- Forum: General Rate Laws
- Topic: how to find the rate constant given instantaneous
- Replies: 2
- Views: 621
how to find the rate constant given instantaneous
which equation would one use to find it out?
- Sat Mar 17, 2018 8:04 pm
- Forum: General Rate Laws
- Topic: number of mols effect on result
- Replies: 2
- Views: 491
number of mols effect on result
how does the number of moles affect the rate of reaction
- Sat Mar 17, 2018 7:57 pm
- Forum: Balancing Redox Reactions
- Topic: flipping the sign of anodes
- Replies: 5
- Views: 3202
flipping the sign of anodes
when do you flip the sign of anodes if the are giving in cathodes. I've done some questions and some do and some dont flip the sign and i am unsure why.
- Sat Mar 17, 2018 7:50 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: how to find Q given molarity
- Replies: 1
- Views: 330
how to find Q given molarity
is it still Q= P^n/R^n?
- Sat Mar 17, 2018 7:46 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: changing intermediate K to regular terms
- Replies: 1
- Views: 454
changing intermediate K to regular terms
how do you change intermediate K to one in terms of reactants or products
- Mon Feb 19, 2018 8:50 pm
- Forum: Balancing Redox Reactions
- Topic: example 14.1 in the book
- Replies: 1
- Views: 330
example 14.1 in the book
the example says that the oxidation number of carbon in C2H2O4 is +3 and that it is +4 in CO2. can someone explain why the oxidation numbers are so?
- Wed Jan 31, 2018 11:43 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: phase change change in entropy
- Replies: 2
- Views: 305
phase change change in entropy
how does one calculate the change in entropy in a phase change. I know that Delta S= q(rev)/T= Delta H(fusion)/T , but why suddenly change q to Delta H
- Wed Jan 31, 2018 11:38 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: what exactly is free energy?
- Replies: 5
- Views: 643
what exactly is free energy?
I'm not sure what free energy is, can someone explain it please ( as in Gibbs free energy)
- Wed Jan 31, 2018 11:26 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: entropy and heat capacity
- Replies: 2
- Views: 347
entropy and heat capacity
can heat capacity and entropy ever have the same value since their formulas are so similar?
- Wed Jan 31, 2018 11:21 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: q(rev)
- Replies: 1
- Views: 303
q(rev)
why does delta S use q of a reversible process and not of an irreversible process.
- Wed Jan 31, 2018 11:18 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: 9.13
- Replies: 5
- Views: 637
9.13
why must you assume that there is 1 mole of N?
- Wed Jan 24, 2018 11:01 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: 8.31
- Replies: 5
- Views: 632
Re: 8.31
in page 281, it says that Cv,m= 3/2R . so you multiply both sides by m to make Cv,m just Cv. Then Cv= ΔU/ΔT. multiply both sides by ΔT and you get ΔU= 3/2R n ΔT. and ΔU is just q because w is 0 since there is no change in volume.
- Wed Jan 17, 2018 11:57 pm
- Forum: Calculating Work of Expansion
- Topic: determining value of volume based on enery [ENDORSED]
- Replies: 1
- Views: 282
determining value of volume based on enery [ENDORSED]
in question 8.6, they ask you to determine if the volume of the resulting energy would be more or less to the initial energy. how does one solve for that?
- Wed Jan 17, 2018 11:53 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: increasing energy in a system [ENDORSED]
- Replies: 1
- Views: 277
increasing energy in a system [ENDORSED]
does adding substance in an open system increase energy, why or why not?
- Wed Jan 17, 2018 11:45 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: the sign of q and w [ENDORSED]
- Replies: 6
- Views: 2147
the sign of q and w [ENDORSED]
why is it that sometimes q and w are negative, but in the equation ΔU= q+w they are both positive such in 8.11
- Sun Dec 10, 2017 1:01 am
- Forum: Hybridization
- Topic: what is the composition of a triple bond?
- Replies: 1
- Views: 393
what is the composition of a triple bond?
for example on the practice final that was posted here, question 17 has a CN that are bonded by triple bonds. I know that a pi bond is caused by two p orbits overlapping. since there are two pi bonds, i do not know how to write the composition.
- Sun Dec 10, 2017 12:52 am
- Forum: Trends in The Periodic Table
- Topic: Electron shielding
- Replies: 2
- Views: 490
Electron shielding
It's been a while and have forgotten how to test for electron shielding and its purpose. Can anyone help? I don't seem to grab the concept from just reading the book.
- Sun Dec 10, 2017 12:41 am
- Forum: Properties & Structures of Inorganic & Organic Bases
- Topic: OxoAcid strength
- Replies: 2
- Views: 584
OxoAcid strength
I know that an oxoacid is stronger the more O's it has, but do not know why. Thanks in advance.
- Sun Dec 10, 2017 12:29 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: dotted line that is not resonance
- Replies: 1
- Views: 440
dotted line that is not resonance
there is sometimes a line that connects the TM to a different atom that is dotted but is not resonance. I know this because as i was working through a problem, there was the line connecting the transitionmetal to a N who had resonance with another element, and the FC that i calculated was one. Howev...
- Sun Dec 10, 2017 12:25 am
- Forum: Lewis Acids & Bases
- Topic: the importance of protonation
- Replies: 2
- Views: 407
the importance of protonation
I was going over some practice final problems and did not know what protonation was and was wonder its significance and if itll be on the test.
- Sun Dec 10, 2017 12:23 am
- Forum: Ionic & Covalent Bonds
- Topic: Ca- vs Ca+
- Replies: 2
- Views: 675
Ca- vs Ca+
which one will have stronger bonds and why?
- Sun Dec 10, 2017 12:20 am
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: carboxylic strength
- Replies: 2
- Views: 470
carboxylic strength
How does one determine the strength of a carboxylic acid?
- Sun Dec 10, 2017 12:19 am
- Forum: Bronsted Acids & Bases
- Topic: strength of acid
- Replies: 1
- Views: 346
strength of acid
I remember learning that binary acids are stronger when the electronegativity is larger, but wouldnt it make it harder for the acid to let go of the H if its stronger?
- Sun Dec 10, 2017 12:14 am
- Forum: Naming
- Topic: (en) (dien)
- Replies: 1
- Views: 562
(en) (dien)
will we have to know the full formula for (en) and (dien) on the final?
- Sun Dec 10, 2017 12:05 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: compression vs pressure
- Replies: 6
- Views: 646
compression vs pressure
what is the relationship between pressure and compression? i believed that changing the pressure did not affect the overall Kc but i have a problem where it says that compression doubles the molarity.
- Sun Oct 15, 2017 3:46 pm
- Forum: DeBroglie Equation
- Topic: De Broglies relation
- Replies: 1
- Views: 266
De Broglies relation
I was wondering if there is no wavelength if an object is stationary or still. The momentum will be 0, but anything over 0 is undefined, so I was a bit confused.
- Sun Oct 15, 2017 2:51 pm
- Forum: Properties of Electrons
- Topic: Atomic Spectra [ENDORSED]
- Replies: 3
- Views: 506
Atomic Spectra [ENDORSED]
I got this one wrong in the post-assessment and was not able to solve for the second answer, only the first: . The meter was defined in 1963 as 1,650,763.73 wavelengths of radiation emitted by krypton-86 (it has since been redefined). What is the wavelength of this krypton-86 radiation? To what regi...
- Sun Oct 08, 2017 3:41 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Help with G.15 in the homework
- Replies: 1
- Views: 230
Help with G.15 in the homework
I know how to get the first answer of .05but can not get the second answer and can not seem to figure out what is wrong