I find that OIL RIG is useful:
Oxidation is Loss
Reduction is Gain
Search found 103 matches
- Sun Mar 15, 2020 7:23 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Mnemonic for Oxidation and Reduction
- Replies: 7
- Views: 626
- Sun Mar 15, 2020 7:19 am
- Forum: Balancing Redox Reactions
- Topic: cathode vs anode
- Replies: 11
- Views: 844
Re: cathode vs anode
Usually in a cell diagram anode is on the left and cathode is on the right.
- Sun Mar 15, 2020 7:17 am
- Forum: Ideal Gases
- Topic: T variable in pv=nrt [ENDORSED]
- Replies: 38
- Views: 1748
Re: T variable in pv=nrt [ENDORSED]
Since Kelvin would be canceled out by the units of R, you should convert all temperatures to K.
- Sun Mar 15, 2020 7:16 am
- Forum: Van't Hoff Equation
- Topic: K rather than Kc
- Replies: 10
- Views: 766
Re: K rather than Kc
Kp is in terms of pressure while Kc is in terms of molarity (concentration). I would say just during calculations to specify with the subscript.
- Sun Mar 15, 2020 7:15 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Adding H20 to solution
- Replies: 3
- Views: 288
Re: Adding H20 to solution
H2O decreases the concentration of the solution. A cathode being diluted would decrease the cell potential but an anode being diluted would increase the cell potential.
- Sun Mar 08, 2020 9:08 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: K < >
- Replies: 8
- Views: 562
Re: K < >
if the concentration of the products is greater than the concentration of the reactants, K>1 and if the concentration of the products is lower than the concentration of the reactants, K<1. This helps you determine which side the reaction favors.
- Sun Mar 08, 2020 9:05 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Figuring out n
- Replies: 15
- Views: 981
Re: Figuring out n
n is the number of electrons transferred in a reaction.
- Sun Mar 08, 2020 9:04 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Exothermic vs. Endothermic
- Replies: 14
- Views: 977
Re: Exothermic vs. Endothermic
When reactant energy is higher than the product it is exothermic because energy is being released but if the reactant energy is lower than the product, it is endothermic because energy is required.
- Sun Mar 08, 2020 9:03 pm
- Forum: General Rate Laws
- Topic: units
- Replies: 12
- Views: 651
Re: units
K (the equilibrium constant) has no units.
- Sun Mar 08, 2020 9:00 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: K
- Replies: 11
- Views: 668
Re: K
K depends on the concentration of the products and the concentration of the reactants in an equilibrium equation.
- Sun Mar 01, 2020 7:35 pm
- Forum: Balancing Redox Reactions
- Topic: oxidizing agents
- Replies: 11
- Views: 633
Re: oxidizing agents
The agents are what cause the oxidation or reduction so it will be, by definition, the opposite.
- Sun Mar 01, 2020 7:25 pm
- Forum: Balancing Redox Reactions
- Topic: Anode and Cathode
- Replies: 8
- Views: 563
Re: Anode and Cathode
You will need to be able to determine it yourself. The anode is oxidized and the cathode is reduced.
- Sun Mar 01, 2020 7:20 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Current
- Replies: 2
- Views: 219
Re: Current
You should know outline 5 and the last page of outline 4 for test 3. I don't believe current is mentioned but you could go through the objectives again to double check.
- Sun Mar 01, 2020 6:52 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Salt bridge
- Replies: 2
- Views: 234
Re: Salt bridge
It maintains the charge of electrons between the cathode and anode.
- Sun Mar 01, 2020 6:43 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidizing/reducing agent
- Replies: 18
- Views: 1133
Re: Oxidizing/reducing agent
An oxidizing agent is being reduced and the reducing agent is being oxidized.
- Sun Feb 23, 2020 7:47 pm
- Forum: Balancing Redox Reactions
- Topic: What is Being Reduced?
- Replies: 10
- Views: 583
Re: What is Being Reduced?
I think it's safer to just be as specific as possible. It is being reduced because it is gaining the electron while Cu is being oxidized because it is losing the electrons.
- Sun Feb 23, 2020 7:36 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: work
- Replies: 8
- Views: 461
Re: work
Work will be negative when it is done by the system and will be positive when work is done on the system.
- Sun Feb 23, 2020 7:32 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: voltage
- Replies: 8
- Views: 425
Re: voltage
Voltage is the potential difference between two electrodes.
- Sun Feb 23, 2020 7:27 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: n
- Replies: 13
- Views: 783
Re: n
You use whichever R will cancel out the units given.
- Sun Feb 23, 2020 7:23 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: F
- Replies: 7
- Views: 454
Re: F
Faradays constant represents the charge of one mole of electrons.
- Sun Feb 16, 2020 8:14 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Spontaneous
- Replies: 13
- Views: 824
Re: Spontaneous
A reaction is spontaneous where deltaG is negative. When deltaG is positive the reaction is non spontaneous.
- Sun Feb 16, 2020 8:12 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K
- Replies: 12
- Views: 736
Re: K
You include gases and aqueous solutions but exclude liquids, such as water, and solids.
- Sun Feb 16, 2020 8:08 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: q of ice and q of water
- Replies: 8
- Views: 1589
Re: q of ice and q of water
The heat lost by the water has been gained by the ice so you have negative q_water and a positive q_ice.
- Sun Feb 16, 2020 8:06 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Isobaric systems
- Replies: 16
- Views: 847
Re: Isobaric systems
Isobaric systems are systems with constant pressure so you would use an equation that works with the variables you are given as long as pressure is constant. A common equation is deltaH = q
- Sun Feb 16, 2020 8:04 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Meaning of q=-w
- Replies: 14
- Views: 2369
Re: Meaning of q=-w
When delta U is zero that means the equation deltaU = q+w is now 0=q+w so you can now change the equation to be q=-w w is negative because you can have negative work but you can't have negative heat energy. It essentially just means that the heat added to the system is the same as the work being don...
- Sun Feb 09, 2020 9:59 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Calorimeters
- Replies: 17
- Views: 992
Re: Calorimeters
A bomb Calorimeter has a constant volume.
- Sun Feb 09, 2020 9:55 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: spontaneity
- Replies: 18
- Views: 742
Re: spontaneity
A spontaneous reaction will have a negative delta G. A non spontaneous reaction will have a positive delta G.
- Sun Feb 09, 2020 9:52 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ICE BOX
- Replies: 27
- Views: 891
Re: ICE BOX
X is too small when K<10^-3
- Sun Feb 09, 2020 9:45 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Law of Conservation Energy
- Replies: 5
- Views: 246
Re: Law of Conservation Energy
Yes, the energy is converted and will be conserved throughout reactions.
- Sun Feb 09, 2020 9:30 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: X is to small
- Replies: 8
- Views: 522
Re: X is to small
If you didn't have K you wouldn't be able to solve for x. So I think we can assume that we either have to solve for K or for x but not both so in a scenario where you solve for x, K should be given.
- Sun Feb 02, 2020 9:38 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Partial Pressure
- Replies: 7
- Views: 442
Re: Partial Pressure
Partial pressure is the pressure of each individual gas while the total pressure is the pressure of the entire system.
- Sun Feb 02, 2020 9:25 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Temperature
- Replies: 14
- Views: 574
Re: Temperature
A negative delta H is exothermic because heat is being released into the surrounding environment.
- Sun Feb 02, 2020 9:21 pm
- Forum: Calculating Work of Expansion
- Topic: Internal energy
- Replies: 5
- Views: 193
Re: Internal energy
The total energy within the closed system is U which is internal energy.
- Sun Feb 02, 2020 9:18 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Changing the energy of a system
- Replies: 9
- Views: 345
Re: Changing the energy of a system
Heat, mass flow, and work are the ways to change the energy of a system.
- Sun Feb 02, 2020 1:31 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Phase change
- Replies: 20
- Views: 872
Re: Phase change
Delta H would be positive because the molecules are absorbing energy to "loosen" the bonds.
- Sun Jan 26, 2020 3:35 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE
- Replies: 20
- Views: 938
Re: ICE
You use an ICE table to solve for concentrations so usually you will be given K.
- Sun Jan 26, 2020 3:33 pm
- Forum: Phase Changes & Related Calculations
- Topic: Standard State
- Replies: 2
- Views: 195
Re: Standard State
No the standard state depends on the element is the state at which the element is the most stable.
- Sun Jan 26, 2020 3:20 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ice box approximation
- Replies: 9
- Views: 345
Re: ice box approximation
when x is less than 10^-3 it can be assumed to be small and disregarded from the denominator.
- Sun Jan 26, 2020 3:18 pm
- Forum: Ideal Gases
- Topic: pressure
- Replies: 10
- Views: 408
Re: pressure
partial pressure is the pressure of each individual gas and total pressure is the pressure of the entire system.
- Sun Jan 26, 2020 3:10 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Temperature (K)
- Replies: 4
- Views: 108
Re: Temperature (K)
K changes because temperature affects the rate at which the reaction occurs.
- Sun Jan 19, 2020 5:32 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Homework problem 5.I.15
- Replies: 4
- Views: 341
Re: Homework problem 5.I.15
I don't think you get marked off for not using an ice table as long as you get the right answer. However I recall Lavelle gives partial credit for correct procedures so if you did use the ice table but got the answer wrong, you would probably get partial credit.
- Sun Jan 19, 2020 2:53 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Change in Amount of P/R?
- Replies: 2
- Views: 88
Re: Change in Amount of P/R?
K will not change if you add more reactants or products because it is the concentration at equilibrium however Q may change because Q is the reaction quotient that can be calculated at any point during the reaction.
- Sun Jan 19, 2020 2:52 pm
- Forum: General Science Questions
- Topic: Proton and Electron attraction
- Replies: 5
- Views: 190
Re: Proton and Electron attraction
Protons and electrons have opposite charges (Proton + and electron -) so they attract each other.
- Sun Jan 19, 2020 2:49 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Test 1
- Replies: 6
- Views: 342
Re: Test 1
The topics covered will be acids and bases as well as equilibrium.
I find the best way to study for Lavelle's tests are to do the practice problems because some of the questions are directly out of the homework problems.
I find the best way to study for Lavelle's tests are to do the practice problems because some of the questions are directly out of the homework problems.
- Sun Jan 19, 2020 2:44 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kc from K
- Replies: 3
- Views: 117
Kc from K
Question 5.H.5 from the homework asks
Is K different from Kc? and how do you calculate K from Kc?
Evaluate Kc for each of the following equilibria from the value of K:
(a) 2NOCl(g) ∆2NO(g)1Cl2(g),K51.831022 at500K
(b) CaCO3(s) ∆ CaO(s) 1 CO2(g), K 5 167 at 1073 K
Is K different from Kc? and how do you calculate K from Kc?
- Sat Jan 11, 2020 3:42 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Partial Pressure
- Replies: 7
- Views: 340
Re: Partial Pressure
Yes partial pressure is only used for gases with the units of atm.
- Sat Jan 11, 2020 3:41 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Reaction quotient
- Replies: 8
- Views: 426
Re: Reaction quotient
They have different values because K is only at equilibrium and Q can be calculated at any time during the reaction.
- Sat Jan 11, 2020 3:38 pm
- Forum: Ideal Gases
- Topic: Solids and Liquids [ENDORSED]
- Replies: 10
- Views: 578
Re: Solids and Liquids [ENDORSED]
They aren't calculated in equilibrium expressions because they are considered pure substances which don't affect the equilibrium concentration.
- Sat Jan 11, 2020 3:33 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Q
- Replies: 10
- Views: 489
Re: Q
Yes I believe Q can be applied to both concentration and partial pressure.
- Sat Jan 11, 2020 3:29 pm
- Forum: Ideal Gases
- Topic: K vs Q [ENDORSED]
- Replies: 7
- Views: 614
Re: K vs Q [ENDORSED]
The difference between K and Q is K is the concentration at equilibrium and Q is the reaction quotient which is calculated the same as K and can be calculated at any time during the reaction.
Re: Naming
You would use those when the ligand already has a prefix so for example en has a prefix already so if it was (en)2 it would be bisethylenediamine.
- Sun Dec 08, 2019 3:32 pm
- Forum: Significant Figures
- Topic: pH sig figs
- Replies: 9
- Views: 623
Re: pH sig figs
Sig figs for pH will be the same as doing sig figs for any other question! If you are given a concentration to calculate pH with 3 sig figs then your answer should have 3 sig figs.
- Sun Dec 08, 2019 3:31 pm
- Forum: Properties of Light
- Topic: Speed of Light
- Replies: 7
- Views: 635
Re: Speed of Light
the units for c are in meters per second.
- Sun Dec 08, 2019 3:30 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: salt solutions
- Replies: 7
- Views: 479
Re: salt solutions
You need to know how a salt can affect the pH of a solution whether it is making it more basic or acidic.
- Sun Dec 08, 2019 3:29 pm
- Forum: Sigma & Pi Bonds
- Topic: Sigma Vs Pi
- Replies: 12
- Views: 818
Re: Sigma Vs Pi
sigma bonds are the first bonds to form and can rotate. pi bonds are double and triple bonds and cannot rotate.
- Sun Dec 01, 2019 12:15 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Midterm Problem
- Replies: 4
- Views: 516
Re: Midterm Problem
When it asks you to do the Calcium ion it is referring to the most common ion which would be Ca2+. This is apparent when referencing the periodic table because this would be the most stable Calcium ion.
- Sun Dec 01, 2019 12:06 pm
- Forum: Amphoteric Compounds
- Topic: Identifying Them?
- Replies: 12
- Views: 900
Re: Identifying Them?
An amphoteric compound can both accept and donate protons/hydrogen atoms.
- Sun Dec 01, 2019 12:05 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Strength of Acids - Example from Lecture
- Replies: 6
- Views: 490
Re: Strength of Acids - Example from Lecture
It is because chlorine has a higher electronegativity than Hydrogen.
- Sun Dec 01, 2019 12:03 pm
- Forum: Lewis Acids & Bases
- Topic: Proton acceptor and proton donor?
- Replies: 33
- Views: 2175
Re: Proton acceptor and proton donor?
Acids are the proton donors while bases are the proton acceptors.
- Sun Dec 01, 2019 12:02 pm
- Forum: Polyprotic Acids & Bases
- Topic: Polyprotic Acid Reactions- Loss of Proton(s)?
- Replies: 2
- Views: 288
Re: Polyprotic Acid Reactions- Loss of Proton(s)?
Only one proton is lost per reaction so over several reactions, multiple protons can be lost.
- Sun Nov 24, 2019 4:38 pm
- Forum: Bronsted Acids & Bases
- Topic: Bronsted vs Lewis acids
- Replies: 5
- Views: 364
Re: Bronsted vs Lewis acids
Lewis acids accept electron while bronsted give electrons.
- Sat Nov 23, 2019 1:53 pm
- Forum: Biological Examples
- Topic: Histidine
- Replies: 2
- Views: 144
Re: Histidine
After a little googling, I believe it is an amino acid that helps the molecule stabilize after oxidation.
- Sat Nov 23, 2019 1:26 pm
- Forum: Lewis Acids & Bases
- Topic: Week 9 Homework
- Replies: 5
- Views: 267
Re: Week 9 Homework
We are on Outline 5 so we are doing section 9C for the homework.
- Sat Nov 23, 2019 1:24 pm
- Forum: Lewis Acids & Bases
- Topic: Acid and Base Consumption in Humans
- Replies: 2
- Views: 273
Acid and Base Consumption in Humans
Why is it that humans can consume (and enjoy consuming) relatively acidic things but can't consume most bases? It it like this for most species?
- Sat Nov 23, 2019 1:19 pm
- Forum: Biological Examples
- Topic: Example of a Cage like Molecule
- Replies: 2
- Views: 211
Re: Example of a Cage like Molecule
I believe an example in class was myoglobin (FeN4) which is what builds up hemoglobin in the blood.
- Sun Nov 17, 2019 10:52 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Intermolecular Forces and Boiling/Melting Points
- Replies: 3
- Views: 226
Re: Intermolecular Forces and Boiling/Melting Points
Stronger bonds lead to higher boiling/melting points because it takes more energy to break this bonds.
Weaker bonds are easier to break and therefore will have a lower boiling and melting point.
Weaker bonds are easier to break and therefore will have a lower boiling and melting point.
- Sun Nov 17, 2019 10:50 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent or Angular
- Replies: 13
- Views: 1131
Re: Bent or Angular
I would refer to the bond as angular because it is the more formal way of referring to the bond.
Either should be fine but to be safe, I would refer to it as angular as stated in the textbook.
Either should be fine but to be safe, I would refer to it as angular as stated in the textbook.
- Sun Nov 17, 2019 10:47 am
- Forum: Formal Charge and Oxidation Numbers
- Topic: Calculating formal charge
- Replies: 8
- Views: 652
Re: Calculating formal charge
It doesn't matter what atom you start with because you are finding the individual charges for each atom. To find the charge of the molecule you would add up the charges of each individual atom.
The most favorable formal charge is zero because it means the molecule is stable.
The most favorable formal charge is zero because it means the molecule is stable.
- Sun Nov 17, 2019 10:39 am
- Forum: Student Social/Study Group
- Topic: Test 2 Topics
- Replies: 3
- Views: 304
Re: Test 2 Topics
Everything not covered on the midterm will be on the test. This includes dipole moments and the shapes/structures that we are doing now. I'm not sure what else though.
- Sun Nov 17, 2019 10:37 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Shapes We Are Expected to Know
- Replies: 6
- Views: 443
Re: Shapes We Are Expected to Know
I would assume that we need to know the shapes that are gone over in lecture.
- Sat Nov 09, 2019 11:19 am
- Forum: Resonance Structures
- Topic: Resonance Structures
- Replies: 18
- Views: 1153
Re: Resonance Structures
Resonance structures are the different ways the bonds can be done on the same molecule.
For example if there is a double bond on 3 oxygens and a single bond on 1 oxygen, the resonance structure would be the different positions of the single and double bonds on the molecule.
For example if there is a double bond on 3 oxygens and a single bond on 1 oxygen, the resonance structure would be the different positions of the single and double bonds on the molecule.
- Sat Nov 09, 2019 11:12 am
- Forum: Quantum Numbers and The H-Atom
- Topic: Quantum numbers
- Replies: 12
- Views: 775
Re: Quantum numbers
The angular momentum quantum number is l which is 0 to n-1
- Sat Nov 09, 2019 11:05 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Ion-Ion interactions
- Replies: 5
- Views: 254
Re: Ion-Ion interactions
Ion - Ion interactions are the interactions between anion and the cation.
- Sat Nov 09, 2019 10:50 am
- Forum: Ionic & Covalent Bonds
- Topic: Covalent character and ionic character
- Replies: 5
- Views: 333
Re: Covalent character and ionic character
Covalent character is where atoms or molecules share electrons and ionic character is when electrons are "transferred" from one atom to another.
- Sat Nov 09, 2019 10:49 am
- Forum: Ionic & Covalent Bonds
- Topic: C, N, O, and F
- Replies: 13
- Views: 645
Re: C, N, O, and F
Yes they will follow the octet rule even if that makes the formal change not equal to 0 because having 8 electrons in the outer shell is where an atom is most stable.
- Sun Nov 03, 2019 4:14 pm
- Forum: Lewis Structures
- Topic: Lewis structure
- Replies: 3
- Views: 103
Re: Lewis structure
Yes some of the elements can use the d orbital which can help reach the formal charge of zero.
- Sun Nov 03, 2019 3:55 pm
- Forum: Ionic & Covalent Bonds
- Topic: Electron Configuration
- Replies: 7
- Views: 436
Re: Electron Configuration
Yes you should always try to have a half-filled or completely full orbital because it is more stable.
- Sun Nov 03, 2019 3:51 pm
- Forum: Ionic & Covalent Bonds
- Topic: middle atom
- Replies: 13
- Views: 546
Re: middle atom
Most of the time, the central atom is the atom that can form the most bonds with other atoms.
- Sun Nov 03, 2019 3:44 pm
- Forum: Bond Lengths & Energies
- Topic: Strength of Bonds
- Replies: 16
- Views: 684
Re: Strength of Bonds
Shorter bonds are stronger than longer bonds.
- Sun Nov 03, 2019 3:41 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 5
- Views: 344
Re: Formal Charge
You want to calculate the formal charge to ensure that you have the most stable molecule.
- Sun Oct 27, 2019 6:18 pm
- Forum: Lewis Structures
- Topic: Octet Rule
- Replies: 7
- Views: 200
Re: Octet Rule
Helium probably wouldn't bond with other elements because it is already stable as a noble gas. Noble gasses are known not to react with other elements.
- Sun Oct 27, 2019 6:16 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Using periodic table to find configurations?
- Replies: 3
- Views: 172
Re: Using periodic table to find configurations?
Yes it can tell you the electron configuration. The number indicates how many electrons the element has. You can find the orbitals/subshells by looking at what group and period the element is in.
- Sun Oct 27, 2019 5:41 pm
- Forum: Lewis Structures
- Topic: Lone pair
- Replies: 8
- Views: 406
Re: Lone pair
A lone pair is a pair of electrons not bonding two elements together.
- Sun Oct 27, 2019 5:33 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Exceptions to Electron Configuration
- Replies: 7
- Views: 367
Re: Exceptions to Electron Configuration
Cu and Cr are the only exceptions because the half full and full d shell is more stable than a full 4s shell.
- Sun Oct 27, 2019 4:41 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Exceptions
- Replies: 2
- Views: 217
Re: Exceptions
They are the exceptions because a full d orbital and a partially full 4s shell is more stable than an almost full d orbital and a full 4s shell.
- Sun Oct 20, 2019 1:46 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Ordering of s and d orbitals
- Replies: 4
- Views: 150
Re: Ordering of s and d orbitals
I was taught the same thing in high school but I think that it was because it was easier to remember.
Dr. Lavelle said that the 3d was written before the 4s because the 3d subshell has less energy than the 4s subshell.
Dr. Lavelle said that the 3d was written before the 4s because the 3d subshell has less energy than the 4s subshell.
- Sun Oct 20, 2019 12:55 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Short Hand
- Replies: 11
- Views: 459
Re: Short Hand
You pick the noble gas before the element. Those are the ones on the far right of the periodic table. These are chosen because they have filled electron shells.
- Sun Oct 20, 2019 12:54 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Nodal Planes
- Replies: 1
- Views: 54
Re: Nodal Planes
A nodal plane is an area where the probability of finding an electron is zero. It relates to electron distribution because you know that electrons are not within the nodal planes.
- Sun Oct 20, 2019 12:51 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: writing electron configurations
- Replies: 4
- Views: 210
Re: writing electron configurations
There are two electron in the first s shell so you have 1s^2 In the second s shell you also have 2 electrons so you have 2s^2 The p shell can hold 6 electrons in its 3 orbitals but since carbon only has 6 total electrons there is one in 2px and one in 2py. The x and the y indicate which orbitals are...
- Tue Oct 15, 2019 5:29 pm
- Forum: DeBroglie Equation
- Topic: HW 1b.15 part c
- Replies: 2
- Views: 107
Re: HW 1b.15 part c
I believe in this case the answers would be similar with c=frequency*wavelength being 12*10^-9m and frequency=hc/E being 9*10^-9m. However I believe you're supposed to use the frequency=hc/E because the E is factoring in the given velocity (when calculating for kinetic energy) which isn't being fact...
- Sun Oct 13, 2019 12:22 pm
- Forum: Properties of Electrons
- Topic: wave properties of electrons
- Replies: 5
- Views: 226
Re: wave properties of electrons
Constructive interference is when waves are in sync with each other and produce a larger amplitude.
Destructive interference is when they waves are out of sync resulting in a smaller amplitude.
Destructive interference is when they waves are out of sync resulting in a smaller amplitude.
- Sun Oct 13, 2019 12:18 pm
- Forum: Properties of Electrons
- Topic: Diffraction Patterns
- Replies: 3
- Views: 169
Re: Diffraction Patterns
This example shows diffraction patterns because the x ray is being or split when it goes through a crystal. The beam is going to enter at one angle, and exit at another.
- Fri Oct 11, 2019 2:41 pm
- Forum: Properties of Light
- Topic: Using the Rydberg Equation in HW 1A.15
- Replies: 4
- Views: 129
Re: Using the Rydberg Equation in HW 1A.15
I'm not entirely sure either. But I think you could just plug in values for n. I'm not sure if there is a more efficient way of doing this.
- Fri Oct 11, 2019 2:38 pm
- Forum: Significant Figures
- Topic: Sig Figs in Answer
- Replies: 8
- Views: 456
Re: Sig Figs in Answer
If you weren't given ANY numbers to work with, I would simply round to 3 decimals. That's what I normally do. But remember not to round until the final answer.
There are a few resources that are on the website that include the rules for sig figs.
There are a few resources that are on the website that include the rules for sig figs.
- Fri Oct 11, 2019 2:33 pm
- Forum: Properties of Light
- Topic: Amplitude
- Replies: 12
- Views: 575
Re: Amplitude
Amplitude is just how high and low the wave goes but this isn't present in the equations we were given in class. I don't think it is as important as wavelength and frequency in this class. From physics, the amplitude could be calculated using sine, but I don't think we are going to use that in this ...
- Sat Oct 05, 2019 2:32 pm
- Forum: Photoelectric Effect
- Topic: 1B.15 part a
- Replies: 1
- Views: 96
Re: 1B.15 part a
I used the Broglie relationship because you just need to mass of an electron (which is provided in the book) to calculate the answer.
I modeled my work after the example 1B.4
I modeled my work after the example 1B.4
- Sat Oct 05, 2019 2:13 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 2 Homework Problems [ENDORSED]
- Replies: 67
- Views: 7921
Re: Week 2 Homework Problems [ENDORSED]
He didn't specify but that is what we covered in the last 2 lectures so I have been doing problems from the Quantum World homework. EDIT: An email was just sent out and it stated: "Since students want to focus on the high school review topics for test 1 they can hand in homework #2 covering rev...
- Sat Oct 05, 2019 2:10 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg equation [ENDORSED]
- Replies: 73
- Views: 9174
Rydberg equation [ENDORSED]
What exactly is the Rydberg equation and how do you know when to use it?
- Thu Oct 03, 2019 4:06 pm
- Forum: General Science Questions
- Topic: Naming compounds
- Replies: 6
- Views: 295
Re: Naming compounds
My TA said that for the first test we should know a few basic ones but most chemical formulas will be provided.
- Thu Oct 03, 2019 4:04 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Fundamentals F: The Determination of Composition Question #5
- Replies: 3
- Views: 217
Re: Fundamentals F: The Determination of Composition Question #5
You have to find the mass composition of each substance.
First you find the total molar mass.
Then you take the molar mass of each substance and divide it by the molar mass. Multiply by 100% to get each percentage.
First you find the total molar mass.
Then you take the molar mass of each substance and divide it by the molar mass. Multiply by 100% to get each percentage.