Search found 51 matches

by Cali Rauk1D
Tue Mar 13, 2018 9:04 pm
Forum: Balancing Redox Reactions
Topic: Test 2 Q2
Replies: 1
Views: 74

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.
by Cali Rauk1D
Tue Mar 13, 2018 9:01 pm
Forum: *Ketones
Topic: Keytone and Aldeyhdes
Replies: 3
Views: 333

Re: Keytone and Aldeyhdes

Ketone is not at the end of the chain and an aldehyde is only at the end of the chain
by Cali Rauk1D
Tue Mar 13, 2018 8:57 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Molecularity and its importance
Replies: 1
Views: 73

Re: Molecularity and its importance

You need to know the molecularity because it because tells you the rate determining step
by Cali Rauk1D
Tue Mar 13, 2018 8:54 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: arrhenius equation
Replies: 3
Views: 104

Re: arrhenius equation

You use this equation when you want to see a temperature change and how it affects the rate constant
by Cali Rauk1D
Tue Mar 13, 2018 8:53 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: arrhenius equation
Replies: 1
Views: 88

Re: arrhenius equation

You use this when you want to show the affect of a temperature change for the rate constant
by Cali Rauk1D
Tue Mar 13, 2018 8:51 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Gas constants
Replies: 2
Views: 75

Gas constants

How do you know which gas constant to use and when?
by Cali Rauk1D
Tue Mar 13, 2018 8:50 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: EMF
Replies: 1
Views: 87

EMF

Will we need to know electromotive force for the final?
by Cali Rauk1D
Tue Mar 13, 2018 8:46 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Adsorption
Replies: 2
Views: 85

Adsorption

How does adsorption come into play with catalysis?
by Cali Rauk1D
Tue Mar 13, 2018 8:43 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalysts
Replies: 2
Views: 79

Catalysts

What is the difference between homogeneous and heterogeneous catalysts?
by Cali Rauk1D
Tue Mar 13, 2018 8:43 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius
Replies: 1
Views: 65

Arrhenius

Why do reactions that give straight lines have arrhenius behavior?
by Cali Rauk1D
Tue Mar 13, 2018 8:38 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Daniell cells?
Replies: 1
Views: 99

Daniell cells?

Do we need to know Daniell cells?
by Cali Rauk1D
Tue Mar 13, 2018 8:37 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Coefficients in oxidation
Replies: 2
Views: 90

Coefficients in oxidation

Do coefficients matter when calculating oxidation numbers?
by Cali Rauk1D
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: 106

Oxidizing and reducing agents

If you have H+/H2 and then Ni2+/Ni how do you know which is the oxidizing and reducing agents?
by Cali Rauk1D
Mon Mar 12, 2018 9:04 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagram
Replies: 3
Views: 119

Re: Cell Diagram

Pt is used when all the molecules are in a gas state
by Cali Rauk1D
Mon Mar 12, 2018 9:02 pm
Forum: First Order Reactions
Topic: Pseudo First Order Reaction
Replies: 7
Views: 408

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
by Cali Rauk1D
Mon Mar 12, 2018 9:01 pm
Forum: *Enzyme Kinetics
Topic: Catalysis 15.69
Replies: 3
Views: 218

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
by Cali Rauk1D
Wed Mar 07, 2018 9:07 pm
Forum: Second Order Reactions
Topic: 15.35
Replies: 6
Views: 324

Re: 15.35

use the half life equations
by Cali Rauk1D
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: 229

Re: 15.9 part c

they are using two experiments to double check the rate constant but you only have to perform one experiment
by Cali Rauk1D
Mon Mar 05, 2018 10:00 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: Units of k
Replies: 8
Views: 210

Re: Units of k

Each unit of K will be different for each order
by Cali Rauk1D
Mon Mar 05, 2018 9:57 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Quiz 3
Replies: 3
Views: 112

Re: Quiz 3

chapter 15 up until what we did in class Friday
by Cali Rauk1D
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: 145

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
by Cali Rauk1D
Mon Feb 19, 2018 12:17 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 14.29
Replies: 3
Views: 104

Re: 14.29

I believe the phase depends on if it is in an acidic or basic solution.
by Cali Rauk1D
Mon Feb 19, 2018 12:15 pm
Forum: Balancing Redox Reactions
Topic: Net Ionic Equation
Replies: 1
Views: 54

Re: Net Ionic Equation

the net ionic equation do not include spectator ions but include the soluble ions in the solution
by Cali Rauk1D
Thu Feb 08, 2018 5:32 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs free energy and work
Replies: 3
Views: 97

Re: Gibbs free energy and work

When do you use Gibbs free energy? What type of problem would it be?
by Cali Rauk1D
Thu Feb 08, 2018 5:30 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: 9.37
Replies: 3
Views: 131

Re: 9.37

I believe that delta s of f is the formation and delta s of r is the reaction.
by Cali Rauk1D
Thu Feb 01, 2018 9:28 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Problem 9.13
Replies: 4
Views: 155

Re: Problem 9.13

how do you know when to change it from T2/T1 to V2/V1?
by Cali Rauk1D
Thu Feb 01, 2018 9:24 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 9.7
Replies: 7
Views: 174

Re: 9.7

how do you know when you are suppose to use the fractions?
by Cali Rauk1D
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: 157

Re: Heat capacity vs Specific Heat capacity

Do the conditions have to be constant for specific heat capacity?
by Cali Rauk1D
Thu Jan 25, 2018 12:33 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: exothermic vs endothermic [ENDORSED]
Replies: 7
Views: 263

Re: exothermic vs endothermic [ENDORSED]

calorimeters are always isolated systems as well because they cannot exchange matter or energy with its surroundings
by Cali Rauk1D
Fri Jan 19, 2018 5:38 pm
Forum: Calculating Work of Expansion
Topic: work done on and by the system
Replies: 12
Views: 437

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
by Cali Rauk1D
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: 80

Re: Question 8.49

Yes, delta H would be negative because it is an exothermic reaction where the system gives off heat.
by Cali Rauk1D
Mon Jan 15, 2018 9:24 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Homework 8.29
Replies: 5
Views: 167

Re: Homework 8.29

It is NO2 because the more molecules there are the higher the heat capacity can be.
by Cali Rauk1D
Mon Jan 15, 2018 9:21 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Q 8.13
Replies: 9
Views: 277

Re: Q 8.13

It is negative because heat is being absorbed from the system
by Cali Rauk1D
Sat Dec 09, 2017 6:38 pm
Forum: Hybridization
Topic: Composition of a Bond
Replies: 6
Views: 347

Re: Composition of a Bond

the 2 is for the row number
by Cali Rauk1D
Sat Dec 09, 2017 6:22 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Number
Replies: 4
Views: 227

Re: Coordination Number

how do you figure out the coordinate number of complex structures that are not obvious when you look at it?
by Cali Rauk1D
Wed Dec 06, 2017 11:30 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: ICE Chart [ENDORSED]
Replies: 9
Views: 317

Re: ICE Chart [ENDORSED]

How do you tell which way the reaction is going and where to put the + or - X
by Cali Rauk1D
Wed Dec 06, 2017 11:21 am
Forum: Conjugate Acids & Bases
Topic: Strong Acids/Bases [ENDORSED]
Replies: 5
Views: 247

Re: Strong Acids/Bases [ENDORSED]

do we need to memorize what are strong/weak acids and bases?
by Cali Rauk1D
Mon Nov 27, 2017 9:39 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Help understanding polydentate
Replies: 4
Views: 246

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.
by Cali Rauk1D
Mon Nov 27, 2017 12:31 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Q [ENDORSED]
Replies: 7
Views: 423

Re: Q [ENDORSED]

q is the quantity of heat
by Cali Rauk1D
Sun Nov 19, 2017 9:02 pm
Forum: Dipole Moments
Topic: Power of Dipoles
Replies: 2
Views: 145

Re: Power of Dipoles

yes the greater the electronegativity the greater the dipole moment. Dipole moment can also be measured in units of debyes.
by Cali Rauk1D
Sun Nov 19, 2017 8:58 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.25 (Polarity)
Replies: 4
Views: 158

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.
by Cali Rauk1D
Thu Nov 09, 2017 11:19 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Aufbau principle
Replies: 4
Views: 224

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
by Cali Rauk1D
Tue Nov 07, 2017 12:32 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic and Covalent Bonds
Replies: 9
Views: 323

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?
by Cali Rauk1D
Tue Nov 07, 2017 12:26 pm
Forum: Bond Lengths & Energies
Topic: Bond Length
Replies: 8
Views: 636

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.
by Cali Rauk1D
Wed Oct 25, 2017 9:11 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Ground State Scandium
Replies: 3
Views: 153

Re: Ground State Scandium

the 3d1 shell has lower energy than the 4s2 because the 3d1 has unpaired electrons so you write it before.
by Cali Rauk1D
Wed Oct 25, 2017 9:08 am
Forum: Quantum Numbers and The H-Atom
Topic: 4s before 3d
Replies: 3
Views: 308

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.
by Cali Rauk1D
Wed Oct 18, 2017 6:51 pm
Forum: Properties of Electrons
Topic: Problem 1.38 [ENDORSED]
Replies: 3
Views: 232

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.
by Cali Rauk1D
Wed Oct 18, 2017 6:42 pm
Forum: Properties of Electrons
Topic: Calculate energy required to remove an electron
Replies: 6
Views: 1648

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.
by Cali Rauk1D
Tue Oct 10, 2017 11:33 am
Forum: Properties of Light
Topic: chapter 1 question 27
Replies: 2
Views: 132

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.
by Cali Rauk1D
Tue Oct 10, 2017 11:29 am
Forum: *Black Body Radiation
Topic: Stefan-Boltzmann Law
Replies: 3
Views: 337

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.

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