Search found 51 matches
- Fri Mar 16, 2018 6:38 pm
- Forum: *Electrophilic Addition
- Topic: nucleophile and electrophile reactions
- Replies: 6
- Views: 3269
Re: nucleophile and electrophile reactions
do we need to know nucleophiles and electrophiles for the final? What is the difference between them?
- Fri Mar 16, 2018 6:37 pm
- Forum: *Electrophiles
- Topic: what is going to be on the final? [ENDORSED]
- Replies: 12
- Views: 2707
Re: what is going to be on the final? [ENDORSED]
does anyone know if ochem will be huge on the final
- Fri Mar 16, 2018 6:36 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: porous disk
- Replies: 3
- Views: 448
Re: porous disk
how do you know when to use a porous disk?
- Sat Mar 10, 2018 3:55 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Pseudo Rate Law [ENDORSED]
- Replies: 3
- Views: 555
Re: Pseudo Rate Law [ENDORSED]
Are there any homework problems where we use the pseudo rate law?
- Sat Mar 10, 2018 3:50 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Arrhenius Equation [ENDORSED]
- Replies: 7
- Views: 868
Re: Arrhenius Equation [ENDORSED]
how would you find A (frequency factor) in the Arrhenius Equation?
- Sat Mar 10, 2018 3:39 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: formula on 15.61
- Replies: 3
- Views: 491
Re: formula on 15.61
or you can make y2 = ln(k) and y1 = ln(k') as the book did it.
but you should get the same answer either way
but you should get the same answer either way
- Sat Mar 10, 2018 3:37 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: formula on 15.61
- Replies: 3
- Views: 491
Re: formula on 15.61
I used point slope form. If ln(k) = -(Ea/R)(1/T) + ln(A), where y = ln(k), m = -(Ea/R) , x = (1/T), and b = ln(A)
point slope form is (y2-y1) = m(x2-x1)
You can substitute (lnk' - lnk) = -(Ea/R)(1/T' - 1/T)
and then distribute the negative to get:
(lnk' - lnk) = (Ea/R)(1/T - 1/T')
point slope form is (y2-y1) = m(x2-x1)
You can substitute (lnk' - lnk) = -(Ea/R)(1/T' - 1/T)
and then distribute the negative to get:
(lnk' - lnk) = (Ea/R)(1/T - 1/T')
- Sat Mar 03, 2018 10:10 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Kinetics vs Thermodynamics
- Replies: 7
- Views: 1102
Re: Kinetics vs Thermodynamics
If a reaction is thermodynamically stable, will it automatically be kinetically stable?
- Sat Mar 03, 2018 10:07 pm
- Forum: Zero Order Reactions
- Topic: Zero order common?? [ENDORSED]
- Replies: 5
- Views: 741
Re: Zero order common?? [ENDORSED]
is it possible to have a pseudo 0 order reaction
- Sat Mar 03, 2018 10:06 pm
- Forum: First Order Reactions
- Topic: Pseudo-First Order Reaction [ENDORSED]
- Replies: 4
- Views: 574
Re: Pseudo-First Order Reaction [ENDORSED]
what is the difference between k' and k?
- Sun Feb 25, 2018 4:54 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Instantaneous Rate
- Replies: 4
- Views: 669
Re: Instantaneous Rate
Why are we only looking at initial rate of reaction in this chem class?
- Sun Feb 25, 2018 4:47 pm
- Forum: First Order Reactions
- Topic: Reaction order
- Replies: 4
- Views: 614
Re: Reaction order
is it possible to find reaction order for more than two products or reactants?
- Sun Feb 25, 2018 4:39 pm
- Forum: General Rate Laws
- Topic: Reaction Rate and Spontaneity
- Replies: 5
- Views: 1499
Re: Reaction Rate and Spontaneity
can a nonspontaneous and spontaneous reaction have the same reaction rate?
- Sun Feb 18, 2018 11:54 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: notation for galvanic cell
- Replies: 2
- Views: 380
Re: notation for galvanic cell
is there a notation for concentration cells?
- Sun Feb 18, 2018 11:47 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Galvanic vs Concentration
- Replies: 3
- Views: 463
Re: Galvanic vs Concentration
can someone give me an example of concentration cell? Also, are the calculations basically the same equations for the two cells?
- Sun Feb 18, 2018 11:44 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Inert Conductor
- Replies: 3
- Views: 388
Re: Inert Conductor
So is platinum one of the common inert conductors?
- Sun Feb 11, 2018 12:51 am
- Forum: Balancing Redox Reactions
- Topic: Salt Bridges
- Replies: 14
- Views: 1349
Re: Salt Bridges
does a porous disk and salt bridge have the same purpose?
- Sun Feb 11, 2018 12:49 am
- Forum: Balancing Redox Reactions
- Topic: Oxidation vs. reduction
- Replies: 8
- Views: 876
Re: Oxidation vs. reduction
How can you tell which reaction to flip when doing the redox problems?
- Sun Feb 11, 2018 12:44 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Standard Cell Potential
- Replies: 4
- Views: 1110
Re: Standard Cell Potential
I am confused as to the difference between cell potential and reduction potential. Can someone explain it to me? Thanks
- Sun Feb 04, 2018 1:32 am
- 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: Reversible and Irreversible Pathways
- Replies: 4
- Views: 597
Re: Reversible and Irreversible Pathways
So in that case, is an irreversible pathway not at equilibrium?
- Sun Feb 04, 2018 1:30 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: deltaG at equilibrium
- Replies: 5
- Views: 567
Re: deltaG at equilibrium
How will you know using the Gibbs Free energy which way the reaction will proceed if its not at equilibrium?
- Sun Feb 04, 2018 1:27 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Gibbs Free Energy -/+
- Replies: 4
- Views: 542
Re: Gibbs Free Energy -/+
so spontaneous reaction is associated with - Gibbs Free Energy?
- Sat Jan 27, 2018 10:05 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Reversible Vs Irreversible
- Replies: 3
- Views: 437
Re: Reversible Vs Irreversible
So then why is temperature not constant in irreversible reactions?
- Sat Jan 27, 2018 9:59 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Reversible isothermal expansion
- Replies: 4
- Views: 453
Re: Reversible isothermal expansion
So will reversible expansion always be at constant temperature?
- Sat Jan 27, 2018 9:58 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Degeneracy
- Replies: 4
- Views: 555
Re: Degeneracy
Does degeneracy have any relation to the spontaneity of a reaction?
- Fri Jan 19, 2018 6:03 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Difference between heat(q), internal energy(U), and enthalpy(H)
- Replies: 4
- Views: 4276
Re: Difference between heat(q), internal energy(U), and enthalpy(H)
So then, what is the difference between heat (q) and enthalpy (H)? more specifically the difference between q and deltaH
- Fri Jan 19, 2018 5:59 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: the sign of q and w [ENDORSED]
- Replies: 6
- Views: 2175
Re: the sign of q and w [ENDORSED]
so if w decreases, will the internal energy of the system increase or decrease?
- Fri Jan 19, 2018 5:56 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: W=-(Pex)(deltaV)
- Replies: 5
- Views: 1554
Re: W=-(Pex)(deltaV)
Wait, so is the work in perspective of the system?
- Fri Jan 12, 2018 12:13 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: 8.51
- Replies: 3
- Views: 261
Re: 8.51
so when finding the enthalpy of reaction, is it just the sum of enthalpy of formation of products - sum of enthalpy of formation of reactants?
- Fri Jan 12, 2018 12:10 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: 8.49
- Replies: 5
- Views: 395
Re: 8.49
What is the difference between internal energy and enthalpy?
- Thu Jan 11, 2018 12:22 am
- Forum: Phase Changes & Related Calculations
- Topic: Enthalpy is a state property
- Replies: 13
- Views: 1877
Re: Enthalpy is a state property
So would Heat be considered a state property or not?
- Tue Dec 05, 2017 10:27 am
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Oxoacids
- Replies: 1
- Views: 321
Oxoacids
I am very confused on what an oxoacid is. Can someone explain what it is and its significance? Thank you
- Tue Dec 05, 2017 10:25 am
- Forum: Conjugate Acids & Bases
- Topic: Different from Bronsted and Conjugate
- Replies: 3
- Views: 664
Re: Different from Bronsted and Conjugate
Is there a difference between Conjugate Bronsted acid/base and Conjugate Lewis acid/base?
- Sun Dec 03, 2017 11:54 pm
- Forum: Bronsted Acids & Bases
- Topic: Bronsted and Lewis acid definitions?
- Replies: 3
- Views: 561
Re: Bronsted and Lewis acid definitions?
Are lewis acids and bases the same as bronsted? Or are they different types of acids and bases?
- Sun Dec 03, 2017 11:52 pm
- Forum: Amphoteric Compounds
- Topic: Amphiprotic [ENDORSED]
- Replies: 5
- Views: 1002
Re: Amphiprotic [ENDORSED]
What is the difference between amphiprotic and amphoteric
- Sat Nov 25, 2017 9:43 pm
- Forum: Ideal Gases
- Topic: Ideal Gas Law
- Replies: 3
- Views: 514
Re: Ideal Gas Law
What if one of the two assumptions are not met?
- Sat Nov 25, 2017 9:41 pm
- Forum: Ideal Gases
- Topic: Partial pressure when calculating K
- Replies: 4
- Views: 802
Re: Partial pressure when calculating K
When do you use partial pressure versus concentration when finding equilibrium?
- Sun Nov 19, 2017 9:16 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Understanding sigma and pi bonds?
- Replies: 8
- Views: 850
Re: Understanding sigma and pi bonds?
Do sigma and pi bonds apply to ligands and coordination compounds?
- Sun Nov 19, 2017 9:14 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Chelating Complexes
- Replies: 5
- Views: 645
Re: Chelating Complexes
I'm still confused as to the definition or function of a chelate is versus a regular ligand. What is the distinction between the two?
- Sat Nov 11, 2017 12:38 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles [ENDORSED]
- Replies: 3
- Views: 488
Re: Bond Angles [ENDORSED]
how do we know the bond angles for trigonal bipyramidal? Do we need to memorize all the different angles?
- Sat Nov 11, 2017 12:36 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Shape Memorization [ENDORSED]
- Replies: 7
- Views: 1980
Re: Shape Memorization [ENDORSED]
What is the difference between trigonal planar and trigonal bipyramidal?
- Mon Nov 06, 2017 12:46 am
- Forum: Trends in The Periodic Table
- Topic: Electron Affinity [ENDORSED]
- Replies: 6
- Views: 1438
Re: Electron Affinity [ENDORSED]
What is the difference between electron affinity and electronegativity?
- Mon Nov 06, 2017 12:44 am
- Forum: Lewis Structures
- Topic: Lewis Structures
- Replies: 10
- Views: 1108
Re: Lewis Structures
Is the center atom when creating a lewis structure the least electronegative atom or the atom with lowest ionization energy?
- Sat Oct 28, 2017 1:15 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Difference between subshell and orbital [ENDORSED]
- Replies: 9
- Views: 2657
Re: Difference between subshell and orbital [ENDORSED]
Can someone tell me the difference between a wave function and orbitals?
- Sat Oct 28, 2017 1:08 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: electron spin quantum number (ms) [ENDORSED]
- Replies: 4
- Views: 1802
Re: electron spin quantum number (ms) [ENDORSED]
How do you know if an electron will be spin up of spin down?
- Fri Oct 20, 2017 11:03 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Electrostatic potential energy [ENDORSED]
- Replies: 2
- Views: 274
Re: Electrostatic potential energy [ENDORSED]
Yes the charges relate to the charges of the electrons of the atom
- Fri Oct 20, 2017 11:01 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: s-,p-, d-, and f- orbitals
- Replies: 7
- Views: 1386
Re: s-,p-, d-, and f- orbitals
I am confused. When is the d orbital less energy than the next s orbital? and when is d orbital greater energy?
- Fri Oct 13, 2017 1:54 am
- Forum: Properties of Light
- Topic: Question 1.9
- Replies: 3
- Views: 503
Re: Question 1.9
Yes, the wavelength of a microwave is indeed 1mm.
- Thu Oct 12, 2017 11:19 pm
- Forum: Properties of Light
- Topic: Balmer Vs. Lyman
- Replies: 15
- Views: 4180
Re: Balmer Vs. Lyman
I am confused as to what n1 and n2 represent. What exactly does it symbolize?
- Thu Oct 05, 2017 8:00 pm
- Forum: SI Units, Unit Conversions
- Topic: Formula Units
- Replies: 7
- Views: 668
Re: Formula Units
So does formula units only apply to ionic compounds?
- Thu Oct 05, 2017 7:52 pm
- Forum: SI Units, Unit Conversions
- Topic: Sig Figs [ENDORSED]
- Replies: 16
- Views: 3268
Re: Sig Figs [ENDORSED]
How many sig figs is in 0.053?