## Search found 98 matches

Sun Mar 08, 2020 8:31 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Problems
Replies: 6
Views: 112

### Re: Problems

In reference to what?
Sun Mar 08, 2020 8:31 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Cell Diagram
Replies: 16
Views: 239

### Re: Cell Diagram

Yea I think that is an assumption that we make, but they will usually specify regardless.
Sun Mar 08, 2020 8:30 pm
Forum: General Rate Laws
Topic: Pseudo-Rate Law
Replies: 2
Views: 27

### Re: Pseudo-Rate Law

You essentially assume that all the other reactions happen significantly faster than all of the other reactions, so there is a buildup of product of the reaction before and reactant after, as that single slow step is what limits the entire overall reaction.
Sun Mar 08, 2020 8:29 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Rate of Formation/Rate Law
Replies: 1
Views: 30

### Re: Rate of Formation/Rate Law

The rate law can be used to show the rate of a reaction, which is the rate of formation of the product.
Sun Mar 08, 2020 8:16 pm
Forum: General Rate Laws
Topic: rate consumption
Replies: 1
Views: 39

### Re: rate consumption

It depends on the order of the reaction, but you can look at the formula sheet and plug in the values you know.
Sun Mar 08, 2020 8:14 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Determination
Replies: 1
Views: 33

### Re: Determination

Essentially, you follow the equations on the formula sheet, plugging in the values that you know and use a system of equations to calculate the final missing value.
Sun Mar 08, 2020 8:13 pm
Forum: General Rate Laws
Topic: integrated rate law vs general
Replies: 8
Views: 161

### Re: integrated rate law vs general

The integrated rate law is the result of integrating the general rate law, to give you the exact concentration of a reactant at a certain time.
Sun Mar 08, 2020 8:12 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs free energy and K
Replies: 3
Views: 35

### Re: Gibbs free energy and K

The equations are on the formula sheet, but delta G = RTlnK, and u can extrapolate that out to non-standard values of delta G, which shows how Q is related as well.
Sun Mar 08, 2020 8:11 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: calculating Q
Replies: 12
Views: 137

### Re: calculating Q

It can be determined by the overall cell reaction, with the concentrations plugged in for Q (products over reactants)
Thu Mar 05, 2020 6:42 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Question 6.65
Replies: 2
Views: 88

### Question 6.65

What range (in volts) does a voltmeter need to have to measure pH in the range of 1 to 14 at 25 8C if the voltage is zero when pH = 7?

If I use the lower concentration value at 10^-7, I keep getting half the value of the answer in the answer booklet.
Mon Feb 24, 2020 4:58 pm
Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
Topic: Rechargeable Batteries
Replies: 4
Views: 69

### Rechargeable Batteries

Do we have to know how a rechargeable battery works? Because I think Lavelle said that we did not need to know how it works in class.
Mon Feb 24, 2020 4:56 pm
Forum: Balancing Redox Reactions
Topic: Platinum in cell diagram
Replies: 10
Views: 135

### Re: Platinum in cell diagram

You always need something solid that can act as the actual electrode, so you would use a metal like Pt as that electrode.
Mon Feb 24, 2020 4:55 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: pH meter example
Replies: 1
Views: 36

### pH meter example

For the pH meter example he did, is the pH meter the cathode or the anode?
Mon Feb 24, 2020 4:53 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Salt Bridge
Replies: 6
Views: 108

### Salt Bridge

Can a salt bridge consist of any salt or does it have to have to include some of the material in either the cathode or anode solution?
Mon Feb 24, 2020 4:52 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Concentration Cells
Replies: 5
Views: 72

### Concentration Cells

Can you use a salt bridge for a concentration cell or do you need a permeable membrane?
Mon Feb 24, 2020 4:50 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Pressure
Replies: 2
Views: 52

### Pressure

Why does pressure matter for an electrolytic cell? Since they are all concentrations or solids, why would it matter what the pressure is?
Mon Feb 24, 2020 4:49 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Electrolytic Cells
Replies: 3
Views: 51

### Electrolytic Cells

How can you control which way the voltage flows in an electrolytic cell? like why would it just not go in reverse?
Mon Feb 24, 2020 4:47 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Nernst
Replies: 7
Views: 75

### Re: Nernst

If you figure out the reduction equation and the oxidation reaction, and when you cancel them out you will see the exact number of electrons being transferred, which will be your n.
Mon Feb 24, 2020 4:46 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Positive and negative standard potential
Replies: 3
Views: 40

### Re: Positive and negative standard potential

The more positive reduction potential makes it easier to oxidize hydrogen, which means that it will be harder to reduce hydrogen.
Mon Feb 24, 2020 4:45 pm
Forum: Administrative Questions and Class Announcements
Topic: midterm solutions
Replies: 4
Views: 104

### Re: midterm solutions

Everything is posted on the website basically.
Mon Feb 24, 2020 4:44 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Vant Hoff Equation
Replies: 8
Views: 119

### Re: Vant Hoff Equation

All of these equations are basically derived from the ones given on the formula sheet, it just depends on which values are constant and which ones you can manipulate.
Mon Feb 24, 2020 4:43 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Difference
Replies: 5
Views: 56

### Re: Difference

Also, Delta G cannot be calculated by itself, its a derived value basically.
Mon Feb 24, 2020 4:42 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Maximum Potential and Voltage
Replies: 6
Views: 87

### Re: Maximum Potential and Voltage

We are essentially trying to find the maximum potential of the cell, which is when there is no current flowing between the two electrodes. When the electrons start to flow, that is the voltage, which decreases over time.
Mon Feb 24, 2020 4:41 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: n
Replies: 13
Views: 210

### Re: n

the R is 8.314, as that is the R that uses Joules, which is the unit we need to get into Volts
Mon Feb 24, 2020 4:40 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: test 2 material clarification
Replies: 10
Views: 142

### Re: test 2 material clarification

Test 2 is the last page of thermodynamics and the entirety of electrochem. The only material left that we have to be tested on is kinetics.
Mon Feb 24, 2020 4:38 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Electrolytic Cell
Replies: 2
Views: 55

### Re: Electrolytic Cell

Essentially it works like a galvanic cell in which there are both a cathode and an anode, but unlike a galvanic cell, the base reaction has a negative E, and voltage is supplied to keep the reaction progressing.
Mon Feb 03, 2020 2:27 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: endo vs exo
Replies: 8
Views: 43

### Re: endo vs exo

Breaking a bond requires energy, so it would be endothermic while forming bonds releases energy (exothermic)
Mon Feb 03, 2020 2:26 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: reversing signs
Replies: 5
Views: 48

### Re: reversing signs

You only need to reverse the sign for the delta H if you are measuring the change in enthalpy in the surroundings, so the actual system will be the opposite of that.
Mon Feb 03, 2020 2:20 pm
Forum: Calculating Work of Expansion
Topic: units
Replies: 9
Views: 80

### Re: units

w is given in joules.
Mon Feb 03, 2020 2:19 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: Midterm Review
Replies: 7
Views: 113

### Re: Midterm Review

I don't think he has released his review sheet yet, hopefully he will post it later as we get closer to the midterm.
Mon Feb 03, 2020 2:18 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: examples of doing work
Replies: 2
Views: 20

### Re: examples of doing work

Most of the examples of work we will be covering will be a change in volume, like the piston example discussed in class, where the gas inside pushes the piston out(work done by the system) or when the gas is compressed by the piston (work done to the system).
Mon Feb 03, 2020 2:16 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: question on lecture notes about closed system
Replies: 5
Views: 54

### Re: question on lecture notes about closed system

If there was insulation, then it would be an isolated system, as there would be no change in matter or heat.
Mon Feb 03, 2020 2:14 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: closed system energy change
Replies: 1
Views: 20

### Re: closed system energy change

No, in a closed system, heat and work are two different aspects of energy change.
Thu Jan 23, 2020 5:54 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Partial Pressure vs Pressure
Replies: 7
Views: 80

### Re: Partial Pressure vs Pressure

Partial Pressure more specifically is talking about the pressure one gas exerts, while pressure talks about the overall pressure exerted by all the gases in the container, So the partial pressure of all the gases in a container can be added to find the overall pressure.
Thu Jan 23, 2020 5:53 pm
Forum: Student Social/Study Group
Topic: Midterm and Final Question
Replies: 18
Views: 266

### Re: Midterm and Final Question

Last quarter there were a bunch of prep material that TAs and UAs gave out, along with past year exams, but Lavelle doesnt give anything himself.
Thu Jan 23, 2020 5:52 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: 5.61f
Replies: 5
Views: 47

### Re: 5.61f

No the H2O would still not affect anything, as it is the solvent, so there is so much of it that the concentration of it wont really change when the reaction occurs, because it is in so much excess.
Thu Jan 23, 2020 5:50 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: sig figs
Replies: 2
Views: 21

### Re: sig figs

It depends, because if the K is given as a constant, then you do not include it when counting sig figs, but if you are calculating the K, then you will have to use its sig figs
Thu Jan 23, 2020 5:48 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Buffers
Replies: 2
Views: 27

### Re: Buffers

It all depends on what is present when you measure the pH, as a buffer will have concentrations of an acid and a base, rather than just the acid or just the base.
Thu Jan 23, 2020 5:47 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy Units
Replies: 3
Views: 30

### Re: Enthalpy Units

Usually, enthalpy is given in Joules, but other units can be calories, kJ, kilocalories...
Thu Jan 23, 2020 5:45 pm
Forum: Ideal Gases
Topic: Pressure
Replies: 2
Views: 47

### Re: Pressure

Adding the inert gas will not change the pressure of the actual gases in the reaction, as that gas will be present in both the reactants and products, as it is inert. As a result, adding an inert gas does not change the pressure for the actual gases, so there is no shift in the equilibrium.
Thu Jan 23, 2020 5:43 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Temperature
Replies: 6
Views: 82

### Re: Temperature

For exothermic reaction, increasing the temperature will decrease the K, while for endothermic, increasing the temperature will increase the k
Sat Jan 18, 2020 2:33 pm
Forum: General Science Questions
Topic: Body Reactions
Replies: 1
Views: 38

### Re: Body Reactions

There will be a different equilibrium constant values for the reactions, but all of it will be relative anyways.
Sat Jan 18, 2020 2:32 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Solubility
Replies: 2
Views: 43

### Re: Solubility

Equilibrium constants just describe how the reaction will be at equilibrium (the relative concentrations of the products and reactants), so you can use it to predict the behavior of any reaction.
Wed Jan 15, 2020 5:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: When to use K and Kp
Replies: 12
Views: 92

### When to use K and Kp

When you are given a random chemical equation, does it matter if you use K or Kp (concentration or pressure) if the question doesn't specifically state what it wants?
Wed Jan 15, 2020 5:35 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K cutoff
Replies: 5
Views: 48

### Re: K cutoff

It can be less than 10^-3 or greater than 10^3
Wed Jan 15, 2020 5:34 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Why Ignore Liquid or Solid Volume When Calculating K
Replies: 7
Views: 68

### Re: Why Ignore Liquid or Solid Volume When Calculating K

K is all about the concentrations, and the change in the liquid and solid-state is negligible so we can just ignore that.
Wed Jan 15, 2020 5:33 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Endothermic and exothermic reactions
Replies: 11
Views: 666

### Re: Endothermic and exothermic reactions

What helps me visualize this is to treat the energy almost like a product or reactant. So if the reaction is exothermic, energy is a "product" and vice versa. If you increase the temp, you would increase the delta H, so whichever side it is on will end up decreasing.
Wed Jan 15, 2020 5:30 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's Principle
Replies: 6
Views: 43

### Re: Le Chatelier's Principle

When the pressure changes, then the Q will be different than the Kp, so you can figure out which way the experiment will shift according to that.
Wed Jan 15, 2020 5:29 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: calculating kP
Replies: 4
Views: 54

### Re: calculating kP

Its honestly all about being consistent, so if you use the same units for every single calculation, you should be fine.
Wed Jan 15, 2020 5:28 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: volume's effect on K
Replies: 7
Views: 67

### Re: volume's effect on K

K is a constant, so it will essentially always stay the same, with the single exception being temperature due to the change in the kinetic energy of the gas molecules.
Wed Jan 15, 2020 5:27 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Compression on Equilibrium
Replies: 4
Views: 27

### Re: Compression on Equilibrium

There would be no shift in the equilibrium, as if you calculate the new pressure/concentration of the gases after the compression, they will balance out in the K equation, so it would not matter.
Sun Dec 01, 2019 11:43 pm
Forum: Naming
Topic: Bis, Tris, Tetrakis, Pentakis
Replies: 3
Views: 74

### Re: Bis, Tris, Tetrakis, Pentakis

You use these when there is a prefix for the logans, so u use bis instead of having bi in the name of the coordination compound and the ligand itself - bis instead of bi bi(ligand)
Sun Dec 01, 2019 11:41 pm
Forum: Hybridization
Topic: Electronegativity
Replies: 1
Views: 32

### Re: Electronegativity

Hybridization is the orbitals combining, I don’t think it’s really related to the electro negativity.
Sun Dec 01, 2019 11:40 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: strong and weak acid and bases
Replies: 2
Views: 112

### Re: strong and weak acid and bases

I think we have to know them by the general trends, like the alkali metals make strong bases.
Sun Dec 01, 2019 11:39 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Breaking of pi and sigma bonds
Replies: 4
Views: 72

### Re: Breaking of pi and sigma bonds

Sigma bonds will not break if the atoms rotate, only pi bonds will.
Sun Dec 01, 2019 11:38 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: electronegativity
Replies: 4
Views: 58

### Re: electronegativity

The greater the difference in the electro negativity between the two atoms is generally the way to determine which is more electronegative.
Sun Nov 24, 2019 10:21 pm
Forum: Hybridization
Topic: Identifying hybridizations
Replies: 2
Views: 25

### Re: Identifying hybridizations

The easiest way for me to memorize hybridization is to simply count the number of bonds. From there you can fill out the orbitals, with s being one bond, sp going from 2 bonds to 4 with sp3, continuing on with d.
Sun Nov 24, 2019 10:20 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar vs. Nonpolar
Replies: 3
Views: 56

### Re: Polar vs. Nonpolar

The reason that molecule is polar is that the shape is tetrahedral, which means the two Cl atoms aren't going to be opposite of each other. Since they aren't opposites of each other, they will not cancel out and as a result, the molecule will have a net dipole
Sun Nov 24, 2019 10:18 pm
Forum: Naming
Topic: Naming
Replies: 1
Views: 29

### Re: Naming

He sent out an email with all of the ligand names and stuff that you need to memorize for the final.
Sun Nov 24, 2019 10:17 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond angles
Replies: 7
Views: 99

### Re: Bond angles

The bond angles are less than 120 and 90, as it would be a trigonal bipyramidal without the "top" electron, so the lone pair repulsion pushes down and makes the angles slightly less than they were originally with the trigonal bipyramidal shape.
Sun Nov 24, 2019 10:15 pm
Forum: Naming
Topic: Di-, Tri-, Tetra- vs Bis-, Tris-, Tetrakis-
Replies: 11
Views: 178

### Re: Di-, Tri-, Tetra- vs Bis-, Tris-, Tetrakis-

They are used when the ligand has a prefix itself, so the ligand would have a di, tri, etc, so instead of saying didi, you would just say dis.
Sun Nov 17, 2019 3:02 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: writing VSPER formulas
Replies: 2
Views: 32

### Re: writing VSPER formulas

If you draw out I^3-, the central I atom ends up having 5 bonding regions, with 2 bonds and 3 lone pairs. If you look on the VSEPR chart, that would give u a formula of AX2E3, which gives u the linear shape with 180-degree bond angles
Sun Nov 17, 2019 2:59 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Different type of Molecular Shapes
Replies: 2
Views: 23

### Re: Different type of Molecular Shapes

Linear is any situation in which there are simply two atoms bonded to each other (because it resembles a "line"). Trigonal planar is when the central atom has 5 bonding regions, with 3 bonds and 2 lone pairs. Bent is when the central atom has 4 bonding regions, with 2 bonds and 2 lone pairs.
Sun Nov 17, 2019 2:50 pm
Forum: Hybridization
Topic: Homework Outline for Test
Replies: 5
Views: 72

### Re: Homework Outline for Test

I think the majority of the test will be material from the molecular shape and structure homework.
Sun Nov 17, 2019 2:46 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR angles
Replies: 4
Views: 55

### Re: VSEPR angles

Personally, I try to kinda visualize all of the basic shapes (tetrahedral, trigonal pyramidal, trigonal bipyramidal), and in these shapes, all the angles are pretty easy to deduce once you have already kinda visualized the name. The remaining bond angles are usually just less than the "base&quo...
Sun Nov 17, 2019 2:42 pm
Forum: Hybridization
Topic: Test 2 Topics
Replies: 11
Views: 166

### Re: Test 2 Topics

I think he said it is going to cover bonding, VSEPR, and intermolecular interactions. It is not gonna include any content from the midterm, so basically from Outline 2D and onwards to where we are now basically.
Sun Nov 10, 2019 11:17 pm
Forum: Electronegativity
Topic: Atom size
Replies: 22
Views: 722

### Re: Atom size

Its essentially all determined by how close the electrons are to the actual nucleus.
Sun Nov 10, 2019 11:16 pm
Forum: Dipole Moments
Topic: Instantaneous Dipole
Replies: 2
Views: 43

### Re: Instantaneous Dipole

An instantanous dipole is basically when a nearby atom has a dipole moment which causes another atom to have its charges shift as a result of the other atom.
Sun Nov 10, 2019 11:14 pm
Forum: Dipole Moments
Topic: Shape of Molecule
Replies: 2
Views: 25

### Re: Shape of Molecule

The shape basically shows the electron density, so there will only be those interactions where there is/isnt an electron.
Sun Nov 10, 2019 11:13 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizing Calculations
Replies: 2
Views: 49

### Polarizing Calculations

For the final/upcoming test, will we have to calculate how polarizing an atom is using electronegativity?
Sun Nov 10, 2019 11:09 pm
Forum: Octet Exceptions
Topic: Octet exception
Replies: 14
Views: 511

### Re: Octet exception

Elements that have a d-orbital are able to have more than an octet, as the electrons will go into the d-orbital. These are basically all the elements in the 3rd row and down.
Sun Nov 03, 2019 10:11 pm
Forum: Einstein Equation
Topic: 1B.15
Replies: 3
Views: 164

### Re: 1B.15

You can use the c = lambda nu, and then use E = kv to get the energy.
Sun Nov 03, 2019 10:10 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent Character
Replies: 3
Views: 40

### Re: Covalent Character

Covalent character means that the bond is expressing covalent characteristics, which means that the atoms are sharing electrons. The covalent character means that the atoms are sharing the atoms, so they cannot be separated in water and other properties like that. A compound that has a high covalent...
Sun Nov 03, 2019 10:08 pm
Forum: Bond Lengths & Energies
Topic: bond lengths
Replies: 2
Views: 49

### Re: bond lengths

We just need to know that all the bonds in resonance structures are the same length. I think he said that the rest of the information would not be covered but I am not sure.
Sun Nov 03, 2019 10:06 pm
Forum: Lewis Structures
Topic: Determining Atom Arrangement
Replies: 1
Views: 34

### Re: Determining Atom Arrangement

Usually, for the larger molecules, there are differences in the way the formula is presented that gives hints, as atoms that are bonded to each other are usually next to each other in the molecular formula.
Sun Nov 03, 2019 10:04 pm
Forum: Photoelectric Effect
Topic: Dino Nuggets Review #8.a)
Replies: 2
Views: 74

### Re: Dino Nuggets Review #8.a)

Essentially energy is conserved throughout the entire experiment, as the energy of the photon equals the work equation and the energy of the electron ejected. That means that the energy is conserved throughout the reaction. In reference to the conceptual change, photons were no longer only looked as...
Mon Oct 28, 2019 2:26 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Drawing Orbitals and Electron Spins
Replies: 2
Views: 58

### Re: Drawing Orbitals and Electron Spins

That kind of detail isnt really necessary, so only draw it out if the question specifically asks for it.
Mon Oct 28, 2019 2:25 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electrostatic potential energy
Replies: 1
Views: 30

### Re: Electrostatic potential energy

The charge of an electron is a constant, and the distance between the charges is the same as the radius of the atom.
Mon Oct 28, 2019 2:24 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectroscopy
Replies: 2
Views: 50

### Re: Atomic Spectroscopy

We have to use the formula for finding the energy of an energy transition (E = Rh/n^2) and E = hv to get the frecuency
Mon Oct 28, 2019 2:22 am
Forum: Student Social/Study Group
Topic: Will different midterm review sessions cover the same material?
Replies: 8
Views: 125

### Re: Will different midterm review sessions cover the same material?

I am sure that all the review sessions will go over all the proper and necessary material - I doubt you will get punished for having other commitments.
Mon Oct 28, 2019 2:21 am
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge equation?
Replies: 5
Views: 72

### Re: Formal Charge equation?

I believe he is referring to the number of bonds that there are (the number of lines drawn on the Lewis structure for that specific atom.
Sun Oct 20, 2019 10:14 pm
Forum: Photoelectric Effect
Topic: Chemistry Equations
Replies: 2
Views: 47

### Re: Chemistry Equations

All the equations we will need to know will be on the first sheet of any test we take, so we wont have to memorize or keep track of all of them and their constants. You will need to know which variable means what, which will allow you to use the right equation for any set of given information
Sun Oct 20, 2019 10:12 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Multi-electron atoms
Replies: 7
Views: 84

### Re: Multi-electron atoms

Yea, multi-electron atom refers to all atoms outside of Hydrogen
Sun Oct 20, 2019 10:10 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configurations
Replies: 2
Views: 40

### Re: Electron Configurations

They change with ionic bonding, where the electrons are transferred but not with covalent bonding.
Sun Oct 20, 2019 10:09 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg
Replies: 3
Views: 55

### Re: Heisenberg

This basically shows that if an electron was centralized in the nucleus, the level of uncertainty would be so large that it would be basically useless. As a result, the size of an atom must be greater so that the Heisenberg equation was actually applicable.
Sun Oct 20, 2019 10:07 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg
Replies: 5
Views: 57

### Re: Heisenberg

The Heisenberg principle highlights that the exact position of an electron cannot be found and that there will always be a level of uncertainty. When they used the size of the nucleus of a hydrogen atom to find the level of uncertainty, they got a value that was so large (greater than the speed of l...
Sun Oct 20, 2019 10:04 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: The equation
Replies: 2
Views: 57

### Re: The equation

The way to derive the exact equation is really complicated and involves really high-level math, so I do not think you need to know how to derive it, rather just what it's used for and how to use it.
Sun Oct 13, 2019 11:13 pm
Forum: Properties of Electrons
Topic: Energy/Light Levels
Replies: 2
Views: 29

### Re: Energy/Light Levels

I don't think we need to know the specific n values for specific types of waves. I think we just need to know that as n increases, the overall energy decreases.
Sun Oct 13, 2019 11:10 pm
Forum: Properties of Electrons
Topic: electrons
Replies: 3
Views: 38

### Re: electrons

Essentially everything has both normal particle properties and wave properties. It's just that the larger particles have such small wavelengths that they are basically not identifiable, which is seen through the de Broglie equation. That's why even a baseball has wave properties, but they are so sma...
Sun Oct 13, 2019 11:06 pm
Forum: Properties of Electrons
Topic: Electrons wavelengths and frequency
Replies: 2
Views: 67

### Re: Electrons wavelengths and frequency

I am pretty sure everything in the universe has its own energy. An electron can absorb energy from photons, which causes it to jump up electron levels. When the electron loses that energy, it drops down energy levels, releasing the energy it absorbed originally from the photon. It has its own wavele...
Sun Oct 13, 2019 11:00 pm
Forum: Properties of Light
Topic: Physically changing amplitude
Replies: 1
Views: 19

### Physically changing amplitude

How can we practically manipulate intensity? (like we can change wavelength and frequency by changing the color of the light)
Sun Oct 13, 2019 10:59 pm
Forum: Properties of Light
Topic: Changing Amplitude
Replies: 2
Views: 47

### Changing Amplitude

We talked in class about how changing the intensity (amplitude) of the light did not change the energy of the photon. However, how does increasing the amplitude result in more total photons?
Mon Oct 07, 2019 3:13 pm
Forum: Properties of Electrons
Topic: Balmer and Lyman series
Replies: 2
Views: 54

### Balmer and Lyman series

What exactly characterizes all the lines in the series? I understand it has to do with lower and higher energy states but how exactly are the series grouped together?
This is HW #1A 11.
Sun Oct 06, 2019 12:11 am
Forum: Empirical & Molecular Formulas
Topic: Limiting Reactants
Replies: 4
Views: 82

### Limiting Reactants

Would we ever have to calculate the amount of remaining reactant in a calculation (how much of the reactant that isnt limiting is left)
Sun Oct 06, 2019 12:10 am
Forum: Administrative Questions and Class Announcements
Topic: Test
Replies: 2
Views: 55

### Test

For the test it says there are only 7 questions, does that mean all the questions are going to be free-response with no multiple choice?
Sun Oct 06, 2019 12:07 am
Forum: Empirical & Molecular Formulas
Topic: Decimals to Whole Numbers
Replies: 6
Views: 273

### Re: Decimals to Whole Numbers

Usually you want a whole number, but most of the time it doesn't get to an exact number, so I think plus or minus 0.1 should be fine.
Sun Oct 06, 2019 12:04 am
Forum: Empirical & Molecular Formulas
Topic: Hydrates
Replies: 2
Views: 66

### Hydrates

One of the homework problems requires you to know what a heptahydrate is, is that necessary to know for the test?
Sun Oct 06, 2019 12:03 am
Forum: Empirical & Molecular Formulas
Topic: Chemical Formulas
Replies: 2
Views: 67

### Chemical Formulas

For the test, do we have to memorize any formulas for certain compounds? Certain questions on the homework expected you to know certain formulas, so want to clarify before the test if there is anything we need to memorize.