Search found 51 matches
- Tue Mar 13, 2018 9:04 pm
- Forum: Balancing Redox Reactions
- Topic: Test 2 Q2
- Replies: 1
- Views: 273
Re: Test 2 Q2
First you have to find E naught an then you plug in E naught into E naught=RT/nFlnK to solve for K. The reaction is not spontaneous because if the E naught is negative then the delta G would be positive so it is not spontaneous.
- Tue Mar 13, 2018 9:01 pm
- Forum: *Ketones
- Topic: Keytone and Aldeyhdes
- Replies: 3
- Views: 3308
Re: Keytone and Aldeyhdes
Ketone is not at the end of the chain and an aldehyde is only at the end of the chain
- Tue Mar 13, 2018 8:58 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Oxidizing and reducing agents
- Replies: 2
- Views: 425
Re: Oxidizing and reducing agents
This was a problem on test 2
- Tue Mar 13, 2018 8:57 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Molecularity and its importance
- Replies: 1
- Views: 238
Re: Molecularity and its importance
You need to know the molecularity because it because tells you the rate determining step
- Tue Mar 13, 2018 8:54 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: arrhenius equation
- Replies: 3
- Views: 410
Re: arrhenius equation
You use this equation when you want to see a temperature change and how it affects the rate constant
- Tue Mar 13, 2018 8:53 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: arrhenius equation
- Replies: 1
- Views: 297
Re: arrhenius equation
You use this when you want to show the affect of a temperature change for the rate constant
- Tue Mar 13, 2018 8:51 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Gas constants
- Replies: 2
- Views: 335
Gas constants
How do you know which gas constant to use and when?
- Tue Mar 13, 2018 8:50 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: EMF
- Replies: 1
- Views: 269
EMF
Will we need to know electromotive force for the final?
- Tue Mar 13, 2018 8:46 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Adsorption
- Replies: 2
- Views: 403
Adsorption
How does adsorption come into play with catalysis?
- Tue Mar 13, 2018 8:43 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalysts
- Replies: 2
- Views: 341
Catalysts
What is the difference between homogeneous and heterogeneous catalysts?
- Tue Mar 13, 2018 8:43 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Arrhenius
- Replies: 1
- Views: 273
Arrhenius
Why do reactions that give straight lines have arrhenius behavior?
- Tue Mar 13, 2018 8:38 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Daniell cells?
- Replies: 1
- Views: 314
Daniell cells?
Do we need to know Daniell cells?
- Tue Mar 13, 2018 8:37 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Coefficients in oxidation
- Replies: 2
- Views: 471
Coefficients in oxidation
Do coefficients matter when calculating oxidation numbers?
- Tue Mar 13, 2018 8:35 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Oxidizing and reducing agents
- Replies: 2
- Views: 425
Oxidizing and reducing agents
If you have H+/H2 and then Ni2+/Ni how do you know which is the oxidizing and reducing agents?
- Mon Mar 12, 2018 9:04 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram
- Replies: 3
- Views: 444
Re: Cell Diagram
Pt is used when all the molecules are in a gas state
- Mon Mar 12, 2018 9:02 pm
- Forum: First Order Reactions
- Topic: Pseudo First Order Reaction
- Replies: 7
- Views: 1684
Re: Pseudo First Order Reaction
Basically a pseudo first order reaction is when you change a second order into a first order by taking away the intermediate. It makes it easier to solve
- Mon Mar 12, 2018 9:01 pm
- Forum: *Enzyme Kinetics
- Topic: Catalysis 15.69
- Replies: 3
- Views: 598
Re: Catalysis 15.69
In part A use arrehnius equation and then use the temperature in part b and repeat what you did in the previous step
- Wed Mar 07, 2018 9:07 pm
- Forum: Second Order Reactions
- Topic: 15.35
- Replies: 6
- Views: 1063
Re: 15.35
use the half life equations
- Wed Mar 07, 2018 9:04 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: 15.9 part c
- Replies: 3
- Views: 630
Re: 15.9 part c
they are using two experiments to double check the rate constant but you only have to perform one experiment
- Mon Mar 05, 2018 10:00 am
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Units of k
- Replies: 8
- Views: 1398
Re: Units of k
Each unit of K will be different for each order
- Mon Mar 05, 2018 9:57 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Quiz 3
- Replies: 3
- Views: 431
Re: Quiz 3
chapter 15 up until what we did in class Friday
- Mon Feb 19, 2018 12:22 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: E vs E naught
- Replies: 3
- Views: 4218
Re: E vs E naught
E naught is also has to do with the overall cell potential where the two electrodes of a cell have an overall difference which is the standard potentials
- Mon Feb 19, 2018 12:17 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 14.29
- Replies: 3
- Views: 465
Re: 14.29
I believe the phase depends on if it is in an acidic or basic solution.
- Mon Feb 19, 2018 12:15 pm
- Forum: Balancing Redox Reactions
- Topic: Net Ionic Equation
- Replies: 1
- Views: 263
Re: Net Ionic Equation
the net ionic equation do not include spectator ions but include the soluble ions in the solution
- Thu Feb 08, 2018 5:32 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Gibbs free energy and work
- Replies: 3
- Views: 437
Re: Gibbs free energy and work
When do you use Gibbs free energy? What type of problem would it be?
- Thu Feb 08, 2018 5:30 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: 9.37
- Replies: 3
- Views: 451
Re: 9.37
I believe that delta s of f is the formation and delta s of r is the reaction.
- Thu Feb 01, 2018 9:28 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Problem 9.13
- Replies: 4
- Views: 583
Re: Problem 9.13
how do you know when to change it from T2/T1 to V2/V1?
- Thu Feb 01, 2018 9:24 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: 9.7
- Replies: 7
- Views: 713
Re: 9.7
how do you know when you are suppose to use the fractions?
- Thu Jan 25, 2018 12:43 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Heat capacity vs Specific Heat capacity
- Replies: 5
- Views: 700
Re: Heat capacity vs Specific Heat capacity
Do the conditions have to be constant for specific heat capacity?
- Thu Jan 25, 2018 12:33 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: exothermic vs endothermic [ENDORSED]
- Replies: 7
- Views: 1138
Re: exothermic vs endothermic [ENDORSED]
calorimeters are always isolated systems as well because they cannot exchange matter or energy with its surroundings
- Fri Jan 19, 2018 5:38 pm
- Forum: Calculating Work of Expansion
- Topic: work done on and by the system
- Replies: 12
- Views: 1384
Re: work done on and by the system
W is negative if work is done on the system and w is positive if work is done by system
- Fri Jan 19, 2018 5:27 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Question 8.49
- Replies: 2
- Views: 215
Re: Question 8.49
Yes, delta H would be negative because it is an exothermic reaction where the system gives off heat.
- Mon Jan 15, 2018 9:24 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Homework 8.29
- Replies: 5
- Views: 541
Re: Homework 8.29
It is NO2 because the more molecules there are the higher the heat capacity can be.
- Mon Jan 15, 2018 9:21 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Q 8.13
- Replies: 9
- Views: 993
Re: Q 8.13
It is negative because heat is being absorbed from the system
- Sat Dec 09, 2017 6:38 pm
- Forum: Hybridization
- Topic: Composition of a Bond
- Replies: 6
- Views: 870
Re: Composition of a Bond
the 2 is for the row number
- Sat Dec 09, 2017 6:22 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination Number
- Replies: 4
- Views: 625
Re: Coordination Number
how do you figure out the coordinate number of complex structures that are not obvious when you look at it?
- Wed Dec 06, 2017 11:30 am
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: ICE Chart [ENDORSED]
- Replies: 9
- Views: 1276
Re: ICE Chart [ENDORSED]
How do you tell which way the reaction is going and where to put the + or - X
- Wed Dec 06, 2017 11:21 am
- Forum: Conjugate Acids & Bases
- Topic: Strong Acids/Bases [ENDORSED]
- Replies: 5
- Views: 636
Re: Strong Acids/Bases [ENDORSED]
do we need to memorize what are strong/weak acids and bases?
- Mon Nov 27, 2017 9:39 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Help understanding polydentate
- Replies: 4
- Views: 773
Re: Help understanding polydentate
you can determine this by seeing if the ligand can bind to a central metal atom at 1,2, or many sites.
- Mon Nov 27, 2017 12:31 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Q [ENDORSED]
- Replies: 7
- Views: 1122
Re: Q [ENDORSED]
q is the quantity of heat
- Sun Nov 19, 2017 9:02 pm
- Forum: Dipole Moments
- Topic: Power of Dipoles
- Replies: 2
- Views: 296
Re: Power of Dipoles
yes the greater the electronegativity the greater the dipole moment. Dipole moment can also be measured in units of debyes.
- Sun Nov 19, 2017 8:58 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 4.25 (Polarity)
- Replies: 4
- Views: 624
Re: 4.25 (Polarity)
Yes if the dipole moment cancels than it is non polar. If one atom is more electronegative than the other than it will be pulling more towards it so it will become polar.
- Thu Nov 09, 2017 11:19 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Aufbau principle
- Replies: 4
- Views: 641
Re: Aufbau principle
Yes the pauli exclusion states there are no more than 2e- per orbital and Hund's rule says due to e- repulsion, e- in same subshell will occupy different orbitals with parallel spin
- Tue Nov 07, 2017 12:32 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic and Covalent Bonds
- Replies: 9
- Views: 1121
Re: Ionic and Covalent Bonds
I am not quite sure what the "correcting ionic model" means because it says all ionic bonds have some covalent character. How is that true?
- Tue Nov 07, 2017 12:26 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Length
- Replies: 8
- Views: 3329
Re: Bond Length
we know the bond length due to how many electrons are being shared. The stronger the pull of the electrons the shorter bond length you will get. If there is a weak pull then the length will be long.
- Wed Oct 25, 2017 9:11 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Ground State Scandium
- Replies: 3
- Views: 840
Re: Ground State Scandium
the 3d1 shell has lower energy than the 4s2 because the 3d1 has unpaired electrons so you write it before.
- Wed Oct 25, 2017 9:08 am
- Forum: Quantum Numbers and The H-Atom
- Topic: 4s before 3d
- Replies: 3
- Views: 11239
Re: 4s before 3d
you write 3d before the 4s because the 3d is not completely filled. It has unpaired electrons so the energy level is lower than the completely filled 4s shell.
- Wed Oct 18, 2017 6:51 pm
- Forum: Properties of Electrons
- Topic: Problem 1.38 [ENDORSED]
- Replies: 3
- Views: 408
Re: Problem 1.38 [ENDORSED]
They are different because the light constant is a specific number that does not change where as velocity can change due to direction.
- Wed Oct 18, 2017 6:42 pm
- Forum: Properties of Electrons
- Topic: Calculate energy required to remove an electron
- Replies: 8
- Views: 6696
Re: Calculate energy required to remove an electron
All you would have to do is use 150.6kJ/mol and divide by 100 and get 1.506 and raise to 10^5.
- Tue Oct 10, 2017 11:33 am
- Forum: Properties of Light
- Topic: chapter 1 question 27
- Replies: 2
- Views: 284
chapter 1 question 27
I am trying to find how many proton the lamp can generate in 2 seconds. I know I should use the E=hv equation but I am getting stuck at where to use the 32 Jxs^-1.
- Tue Oct 10, 2017 11:29 am
- Forum: *Black Body Radiation
- Topic: Stefan-Boltzmann Law
- Replies: 3
- Views: 642
Re: Stefan-Boltzmann Law
This law is useful in blackbody problems as well as surfaces that absorb heat. There is a relationship between the wavelength and temperature. As one goes up the other goes up. It relates to the energy for wavelength and electromagnetic radiation.