Search found 118 matches
- Sun Mar 15, 2020 7:56 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: adding platinum
- Replies: 8
- Views: 538
Re: adding platinum
It will tell you if there is another metal, if not put platinum if writing out how the cell would look like. Platinum is most commonly used as an electrode.
- Sun Mar 15, 2020 7:50 am
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: R
- Replies: 3
- Views: 313
Re: R
I believe you use the 8.314 (Joules/ Kelvin x mol). This is just the easiest way to utilize the gas constant as the rest of the units for other variables are in similar units as R.
- Fri Mar 13, 2020 10:51 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Activation Energy vs Free Energy of Activation
- Replies: 6
- Views: 536
Re: Activation Energy vs Free Energy of Activation
The former refers to the energy barrier that needs to be surpassed in order for the reaction to occur (reaction specific) and the ladder means energy needed to cause a reaction for it to take place.
- Fri Mar 13, 2020 10:49 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Methods
- Replies: 3
- Views: 241
Re: Methods
Pre-equilibrium he stated is what we will be utilizing, not steady state.
- Fri Mar 13, 2020 10:48 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Rate Constant and Shorter Half Life
- Replies: 5
- Views: 631
Re: Rate Constant and Shorter Half Life
If the rate content is high it means the reaction occurs quicker the higher the constant. In turn, the half life is reached at a quicker rate.
- Fri Mar 13, 2020 10:47 am
- Forum: Balancing Redox Reactions
- Topic: OH vs H
- Replies: 12
- Views: 871
Re: OH vs H
No since fundamentally, H+ would make a solution more acidic and in a basic equation, you have more OH- so OH- would be utilized to balance only in basic solutions.
- Fri Mar 13, 2020 10:46 am
- Forum: First Order Reactions
- Topic: Difference between first and second order
- Replies: 6
- Views: 492
Re: Difference between first and second order
Think about it from a mathematical view, a first order means it is dependent on one reactant to the first power. A second order means either a) dependent on two reactants to the first power or one reactant to the second power, in order for reaction to proceed.
- Thu Mar 05, 2020 7:09 pm
- Forum: Balancing Redox Reactions
- Topic: Half reactions
- Replies: 6
- Views: 441
Re: Half reactions
H20, hydrogens, and lastly electrons!
- Thu Mar 05, 2020 7:08 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Inert Metals
- Replies: 4
- Views: 326
Re: Inert Metals
Platinum is better as it is best as an electrode.
- Thu Mar 05, 2020 7:07 pm
- Forum: General Science Questions
- Topic: Test 2
- Replies: 16
- Views: 953
Re: Test 2
No kinetics, just electrochemical and second page of thermodynamics.
- Thu Mar 05, 2020 7:06 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram
- Replies: 6
- Views: 430
Re: Cell Diagram
It could have any state ion matter I think too.
- Thu Mar 05, 2020 7:06 pm
- Forum: Balancing Redox Reactions
- Topic: Acidic and Basic Redox Reactions
- Replies: 9
- Views: 526
Re: Acidic and Basic Redox Reactions
You must be told in order to know if you will have h plus or oh-
- Thu Mar 05, 2020 7:05 pm
- Forum: Balancing Redox Reactions
- Topic: Cathode and Anode
- Replies: 24
- Views: 1531
Re: Cathode and Anode
Equilibrium not reached so it will continue if cathode Ecell greater than 0.
- Thu Mar 05, 2020 7:03 pm
- Forum: General Science Questions
- Topic: Test 2 Grades [ENDORSED]
- Replies: 23
- Views: 1552
Re: Test 2 Grades [ENDORSED]
following week discussion
- Thu Mar 05, 2020 7:02 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Adding Pt(s) to a Cell Diagram
- Replies: 14
- Views: 819
Re: Adding Pt(s) to a Cell Diagram
Platinum does not involve itself in the reaction and therefore it should be included because it does not oxidate and functions as an electrode.
- Mon Feb 24, 2020 10:04 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Galvanic/voltaic cell
- Replies: 6
- Views: 457
Re: Galvanic/voltaic cell
Galvinic cell is spontaneous while electrolytic focuses more on non-spontaneous reactions.
- Mon Feb 24, 2020 9:56 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Sign of delta G
- Replies: 9
- Views: 569
Re: Sign of delta G
Sign of delta G may be the most relevant info as info relating to K may not be available.
- Mon Feb 24, 2020 9:54 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: nernst equation
- Replies: 3
- Views: 247
Re: nernst equation
It ties the max potential of an electrochemical cell to respective cell concentrations that are in the battery and the conditions of it can be assumed regular as @25 degrees C or also for non-regular conditions.
- Mon Feb 24, 2020 9:52 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Anode/ Cathode
- Replies: 3
- Views: 192
Re: Anode/ Cathode
The word "agent' is what it refers to as doing the respective action so keep an eye out for that.
- Mon Feb 24, 2020 9:51 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Galvanic Cells
- Replies: 2
- Views: 183
Re: Galvanic Cells
It would not be a galvanic cell of it is negative. that would suck the energy out of say, your phone battery instead of charging it.
- Wed Feb 19, 2020 4:11 pm
- Forum: Balancing Redox Reactions
- Topic: Understanding Half-Reactions
- Replies: 11
- Views: 658
Re: Understanding Half-Reactions
I believe its just to help you break down the problem and measure oxidation by itself and then reduction. After, you can then combine them to continue the problem.
- Wed Feb 19, 2020 4:08 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing half reactions
- Replies: 11
- Views: 656
Re: Balancing half reactions
Yes! Ensure your charges on both side equal as electrons cancel out.
- Wed Feb 19, 2020 4:02 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Salt Bridge
- Replies: 4
- Views: 284
Re: Salt Bridge
Salt bridge allows for the flow of an electrical current. Without it there would be a buildup of positive charge on anode side and negative buildup on cathode side.
- Wed Feb 19, 2020 3:52 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: galvanic cell structure
- Replies: 8
- Views: 366
Re: galvanic cell structure
Cathode attracts the electrons with positive charge thus associated with reduction. Vice versa with anode.
- Wed Feb 19, 2020 3:49 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Adiabatic systems
- Replies: 14
- Views: 775
Re: Adiabatic systems
Yes Q will always equal 0 since there is no heat transfer.
- Wed Feb 12, 2020 4:44 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Adiabatic process
- Replies: 3
- Views: 139
Re: Adiabatic process
I think irreversible would be at a higher temp since for reversible the temp is constant.
- Tue Feb 11, 2020 12:27 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Reason for decrease in entropy
- Replies: 5
- Views: 259
Re: Reason for decrease in entropy
Entropy decreased when a system becomes more orderly. Less particle dispersion.
- Tue Feb 11, 2020 12:25 pm
- Forum: Student Social/Study Group
- Topic: just confirming there is no class Wednesday of the midterm?
- Replies: 5
- Views: 368
Re: just confirming there is no class Wednesday of the midterm?
I believe there is only a group discussion for last minute questions only. No class :)
- Tue Feb 11, 2020 11:34 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: adiabatic
- Replies: 19
- Views: 982
Re: adiabatic
I think thats no transfer of heat or mass of substances between a thermodynamic system and surroundings.
- Tue Feb 11, 2020 11:33 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Delta S(total)
- Replies: 3
- Views: 79
Re: Delta S(total)
if you did some expansion work (I believe if it can be reversed) and then compressed back to your original state then delta s would give you =0.
- Tue Feb 11, 2020 11:32 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: state property
- Replies: 4
- Views: 200
Re: state property
Because Gibbs is made up of other state properties, it too is a state property.
- Tue Feb 11, 2020 11:31 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Question 4B.3
- Replies: 5
- Views: 296
Re: Question 4B.3
It was a type I also stressed over it but yea it seems you were right.
- Mon Feb 03, 2020 12:36 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Thermodynamic Systems
- Replies: 3
- Views: 146
Re: Thermodynamic Systems
It is an open, closed, and isolated system!
- Mon Feb 03, 2020 12:34 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: kinetics
- Replies: 8
- Views: 183
Re: kinetics
Kinetics is the study of how temp and catalysts change the rate of a reaction.
- Mon Feb 03, 2020 12:32 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: First Law
- Replies: 5
- Views: 323
Re: First Law
It is the sum of all energy in the system both kinetic and potential.
- Mon Feb 03, 2020 12:30 pm
- Forum: Calculating Work of Expansion
- Topic: Calculus on The Midterm
- Replies: 8
- Views: 427
Re: Calculus on The Midterm
I believe the calculus would help understand problems but not needed!
- Mon Feb 03, 2020 12:29 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: enthalpy
- Replies: 7
- Views: 205
Re: enthalpy
It is the heat of the system times the volume and pressure.
- Fri Jan 31, 2020 9:43 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Reversible Process
- Replies: 4
- Views: 150
Re: Reversible Process
As somewhat indicated in the n are reversible reactions can return to their former state and I believe there isn't much fo a change so that is why this can happen.
- Fri Jan 31, 2020 9:42 pm
- Forum: Ideal Gases
- Topic: Temperature
- Replies: 17
- Views: 725
Re: Temperature
It depends on the units that the question is asking for. But you should be good as a drop of 1 degree in K is same as in C
- Fri Jan 31, 2020 9:41 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Strong/weak acids & bases
- Replies: 14
- Views: 894
Re: Strong/weak acids & bases
Just focus on recognizing the strong acids and bases and I believe the weak ones will become noticeable easier.
- Fri Jan 31, 2020 9:39 pm
- Forum: Phase Changes & Related Calculations
- Topic: Phase Changes
- Replies: 17
- Views: 661
Re: Phase Changes
Yes it is constant because the energy is going towards breaking the forces of a molecule so that such a change can occur.
- Fri Jan 31, 2020 9:37 pm
- Forum: Phase Changes & Related Calculations
- Topic: DELTA H Vs Q
- Replies: 7
- Views: 362
Re: DELTA H Vs Q
Yes because delta H is associated with the heat that is needed for a substance to form.
- Thu Jan 23, 2020 1:53 pm
- Forum: Phase Changes & Related Calculations
- Topic: Systems and Surroundings
- Replies: 3
- Views: 101
Re: Systems and Surroundings
Feel free to fact check me but if i am not mistaken energy in a closed system can go beyond the closed systems boundaries only in the form of heat/work but not matter. Thats just properties of the system you describe. I think an isolated system is the one where nothign goes in or out at all. Again, ...
- Thu Jan 23, 2020 1:45 pm
- Forum: Ideal Gases
- Topic: test 1
- Replies: 9
- Views: 363
Re: test 1
Enthalpy will be on the mid term the only thing for test 1 will be acid/base calculations and anything before that :) I assume.
- Thu Jan 23, 2020 1:36 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ice table
- Replies: 13
- Views: 534
Re: ice table
You do not include them.
- Thu Jan 23, 2020 1:36 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ice table
- Replies: 13
- Views: 534
Re: ice table
You do not include them.
- Thu Jan 23, 2020 1:34 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 5% rule
- Replies: 13
- Views: 578
Re: 5% rule
You use that rule when x is less than 10^-3, its so small it wont change the concentration of a molecule.
- Thu Jan 23, 2020 1:32 pm
- Forum: Ideal Gases
- Topic: solids and K
- Replies: 8
- Views: 308
Re: solids and K
There are no solids for concentration, that would the be pure substance.
- Thu Jan 23, 2020 1:28 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: H20 in the ICE table
- Replies: 26
- Views: 1399
Re: H20 in the ICE table
You do not include liquids, solids, and water even in expressions. Aqueous is included though. Water in gas phase is included though.
- Thu Jan 16, 2020 7:19 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Inert gas
- Replies: 4
- Views: 93
Re: Inert gas
Most likely a gas that is inert will be noble. It does not react with anything so it just passes along.
- Thu Jan 16, 2020 7:17 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Neutral Solutions
- Replies: 1
- Views: 101
Re: Neutral Solutions
That is because [0H-] = 10^-7, so H30 and OH- will neutralize each other.
- Thu Jan 16, 2020 7:14 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Protonation & Deprotonation
- Replies: 9
- Views: 318
Re: Protonation & Deprotonation
Protonation for bases mostly and deprotonation for acids. Refers to gaining, losing protons
- Thu Jan 16, 2020 7:09 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Converting between K and Kc
- Replies: 2
- Views: 136
Re: Converting between K and Kc
I believe all we need to know is pv=nrt that other one seems to complex and we haven't covered that.
- Thu Jan 16, 2020 7:07 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Cubic functions
- Replies: 3
- Views: 103
Re: Cubic functions
I believe you would need a graphing calculator to solve but those aren't allowed in exam anyways, so I believe you won't have to solve them unless they are simplified.
- Wed Jan 08, 2020 6:56 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Partial Pressures
- Replies: 4
- Views: 152
Re: Partial Pressures
They do not have top add up to 1 but it just happens that is what we are starting off with.
- Wed Jan 08, 2020 6:55 pm
- Forum: Ideal Gases
- Topic: Understanding Q
- Replies: 13
- Views: 472
Re: Understanding Q
Yes you would leave them out of your final expression.
- Wed Jan 08, 2020 6:54 pm
- Forum: Ideal Gases
- Topic: K and Q
- Replies: 8
- Views: 1058
Re: K and Q
Solvents don't change much since an insignificant amount of it decreases and concentration of a solid doesn't quite add up. Thats why they are excluded.
- Wed Jan 08, 2020 6:53 pm
- Forum: Ideal Gases
- Topic: K and Q
- Replies: 8
- Views: 1058
Re: K and Q
Natalie Benitez 1C wrote:How exactly is the Q different from K if they are calculated the same way?
Q means there is still a reaction going on while K means it has reached an equilibrium.
- Wed Jan 08, 2020 6:52 pm
- Forum: Ideal Gases
- Topic: R constant in PV=nRT
- Replies: 9
- Views: 253
Re: R constant in PV=nRT
You would check your units to see which one you would utilize!
- Wed Jan 08, 2020 6:49 pm
- Forum: Ideal Gases
- Topic: kc vs kp
- Replies: 19
- Views: 3370
Re: kc vs kp
Kc is for concentration equilibrium and Kp is for Pressure equilibrium. While they are both calculated in a similar format they are NOT in lieu of the other as they pertain to two different things.
- Mon Dec 02, 2019 10:15 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: polydentates and chelating
- Replies: 2
- Views: 86
Re: polydentates and chelating
Exactly you got it.
- Mon Dec 02, 2019 10:04 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination Number
- Replies: 9
- Views: 444
Re: Coordination Number
It is to the total n umber of atoms bound to it not necessarily ligands since some can bind at multiple sites.
- Mon Dec 02, 2019 10:02 pm
- Forum: Properties & Structures of Inorganic & Organic Bases
- Topic: Ionization in Water
- Replies: 8
- Views: 1027
Re: Ionization in Water
The weak acids partially dissociate and the stronger ones fully disassociate.
- Mon Dec 02, 2019 9:50 pm
- Forum: Industrial Examples
- Topic: Which examples?
- Replies: 3
- Views: 766
Re: Which examples?
The outline problems are a great way of knowing what types of problems to expect.
- Mon Dec 02, 2019 9:50 pm
- Forum: Naming
- Topic: Memorizing
- Replies: 9
- Views: 553
Re: Memorizing
ik it may be kinda boring but yes we must memorize what Lavelle sent out to us.
- Mon Dec 02, 2019 9:48 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Today's lecture
- Replies: 5
- Views: 340
Re: Today's lecture
We went over salts as how they would be in acids and bases. Ions as acids are for the most part cations. A salt containing a base will most likely raise the pH of a solution. He also stated Wednesday and Friday he would go over more problems so come to those days :). Oh and don't forget to check on ...
- Mon Dec 02, 2019 9:44 pm
- Forum: General Science Questions
- Topic: 50 post grade
- Replies: 25
- Views: 1737
Re: 50 post grade
I think as long as you did your weekly 5 posts for every week as a minimum you should be okay.
- Mon Dec 02, 2019 9:41 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Chelating complexes
- Replies: 6
- Views: 363
Re: Chelating complexes
If ligand can bind to more than one site most likely it will be one!
- Mon Dec 02, 2019 9:38 pm
- Forum: Resonance Structures
- Topic: Delocalization
- Replies: 6
- Views: 567
Re: Delocalization
Perhaps when arrows are drawn in the molecule it is a good representation of when a stronger atom pulls on e- and delocalizes charge from an atom with a -1 on it.
- Mon Dec 02, 2019 9:36 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Grades
- Replies: 15
- Views: 950
Re: Grades
Yea roughly you need that amount.
- Mon Dec 02, 2019 9:36 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Exam Location
- Replies: 11
- Views: 701
Re: Final Exam Location
He went over it today and if anything g we might get an email. any further doubts, ask your TA they may know.
- Mon Dec 02, 2019 9:34 pm
- Forum: Polyprotic Acids & Bases
- Topic: Defintion
- Replies: 39
- Views: 2335
Re: Defintion
That means that a molecule can donate more than one proton.
- Mon Dec 02, 2019 9:28 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Hydrogen Bond Sites
- Replies: 5
- Views: 357
Re: Hydrogen Bond Sites
H bonds are defined by if they are attached to a N,O, or F atom.
- Wed Nov 20, 2019 9:52 pm
- Forum: Dipole Moments
- Topic: Hydrogen Bonding
- Replies: 20
- Views: 1098
Re: Hydrogen Bonding
Yes just those atoms.
- Mon Nov 18, 2019 9:53 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone Pairs & Polarity
- Replies: 3
- Views: 106
Re: Lone Pairs & Polarity
Simply depends on the atoms in the molecule, play around with it to see if it does.
- Mon Nov 18, 2019 9:51 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Determining the greater boiling point
- Replies: 4
- Views: 217
Re: Determining the greater boiling point
Look art inter molecular forces in a molecule; the strength of forces involved will determine the melting point!
- Mon Nov 18, 2019 9:48 pm
- Forum: Hybridization
- Topic: Test 2
- Replies: 6
- Views: 359
Re: Test 2
Don't worry about it, only sigma and pi bonds.
- Mon Nov 18, 2019 9:48 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Advice for studying
- Replies: 92
- Views: 6488
Re: Advice for studying
After lecture, perhaps chill for about 30 minutes (if you know going back to your place will make you lazy), hit a study room or library and after cooling down and relaxing (when u have time), look at video modules and perhaps look up complicated concepts andd see how other people teach it. Practice...
- Mon Nov 18, 2019 9:46 pm
- Forum: Dipole Moments
- Topic: Dipole moments
- Replies: 3
- Views: 210
Re: Dipole moments
Yes you place the dipole moment towards the atom with more electronegativity.
- Mon Nov 18, 2019 9:44 pm
- Forum: Lewis Structures
- Topic: double and triple bonds
- Replies: 6
- Views: 712
Re: double and triple bonds
Why does arsenic have lone pairs? And how would you know it would have lone pairs being the central atom? From practice what helps me is abiding b y the rules of electronegativity. Though if it helps play with the problem by filling up all bound atoms valence shells and if electrons are left over i...
- Mon Nov 18, 2019 9:41 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Class Curve?
- Replies: 4
- Views: 311
Re: Class Curve?
Will be determined by class average but surely there will be a form of curve.
- Mon Nov 18, 2019 9:40 pm
- 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 in CO2
- Replies: 4
- Views: 1512
Re: Intermolecular Forces in CO2
Only London dispersion forces since it is a non-polar molecule.
- Mon Nov 18, 2019 9:38 pm
- Forum: Ionic & Covalent Bonds
- Topic: Lone pairs
- Replies: 4
- Views: 332
Re: Lone pairs
Lone pairs are placed as far as possible to minimize electron repulsion.
- Mon Nov 18, 2019 9:37 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Trigonal Bipyramidal
- Replies: 5
- Views: 141
Re: Trigonal Bipyramidal
E- density influences shape of molecule but is not counted in the molecular shape naming of the molecule. Only bound atoms are.
- Mon Nov 18, 2019 9:32 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 2
- Replies: 7
- Views: 410
Re: Test 2
Stick with bent as it is the term that is mostly used. Perhaps more concise in terms of what Lavelle is looking for.
- Mon Nov 18, 2019 9:31 pm
- Forum: Hybridization
- Topic: Test 2
- Replies: 11
- Views: 527
Re: Test 2
Dont worry about it, luckily just pi and sigma bonds. We should be good just memorize the shapes and electron geometry.
- Mon Nov 18, 2019 9:30 pm
- Forum: Dipole Moments
- Topic: Net Dipole Moment
- Replies: 4
- Views: 248
Re: Net Dipole Moment
Yes, since as mentioned above, in an octahedral shape, it is most stable and net dipole moments is 0.
- Mon Nov 18, 2019 9:28 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: AXE formula
- Replies: 9
- Views: 511
Re: AXE formula
A is the middle atom and will never have a subscript. Only E (lone pairs of the central atom) and X (bound atoms) can have subscripts.
- Mon Nov 18, 2019 9:27 pm
- Forum: Lewis Structures
- Topic: lone pairs
- Replies: 7
- Views: 704
Re: lone pairs
Do your normal lewis diagram and ensure all electrons are accounted for. If all bound atoms are full it means there is most likely a central atom with an expanded octet.
- Sat Nov 09, 2019 9:52 pm
- Forum: Dipole Moments
- Topic: Dipole Dipole
- Replies: 3
- Views: 181
Re: Dipole Dipole
think about electronegativity, look to see if atoms are far apart in the periodic table. Most likely it will have dipole dipole interactions.
- Sat Nov 09, 2019 9:50 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarisability Trend
- Replies: 3
- Views: 200
Re: Polarisability Trend
Yes think about atomic radius, increases left and down, that is the trend.
- Sat Nov 09, 2019 9:49 pm
- Forum: Bond Lengths & Energies
- Topic: Dissociation Energy
- Replies: 5
- Views: 220
Re: Dissociation Energy
It is the required energy to breaks bonds.
- Sat Nov 09, 2019 9:49 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 9
- Views: 328
Re: Formal Charge
You always want to meet the net charge if an ion has a 2+ then you want to make sure some atom(s) are charged to meet that 2+. If there is no net charge then yes it will always have to be 0.
- Sat Nov 09, 2019 9:47 pm
- Forum: Ionic & Covalent Bonds
- Topic: Polarizability
- Replies: 4
- Views: 168
Re: Polarizability
Outer electrons are easily distorted in anions. There is a small nuclear charge which means these electrons are held less tightly. Thus why anions are highly polarizable.
- Sat Nov 02, 2019 5:17 pm
- Forum: Trends in The Periodic Table
- Topic: How to compare the electronic affinity between two atoms
- Replies: 2
- Views: 111
Re: How to compare the electronic affinity between two atoms
Electronegativity always in creased going left to right and down to up. Applies to elements without a full valence shell so CL is much more electronegative.
- Sat Nov 02, 2019 5:05 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Stability
- Replies: 9
- Views: 511
Re: Stability
By having a 0 charge, nothing will interfere (ideally) with the molecule as all electron shells are full. All elements are in the best state to be.
- Sat Nov 02, 2019 5:03 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: How do we draw the electron configurations for transition metal atoms?
- Replies: 2
- Views: 145
Re: How do we draw the electron configurations for transition metal atoms?
I believe you would simply exclude the d block, and count over them so for example, as mentioned above the number of valence e- for group 15 would all be 5.
- Sat Nov 02, 2019 4:59 pm
- Forum: Lewis Structures
- Topic: double bonds
- Replies: 2
- Views: 105
Re: double bonds
This is just a fundamental property of Flourine. Since it is very electronegative, it would pull harder all of the atoms' electrons to it if it were in the center of a molecule. Thus; when doing lewis structures, we want the atom with the least amount of electronegativity in the middle. It is a matt...
- Sat Oct 26, 2019 9:33 pm
- Forum: Lewis Structures
- Topic: Drawing Lewis Structures
- Replies: 8
- Views: 238
Re: Drawing Lewis Structures
Arianna Perea 3H wrote:If you leave a lone pair instead of making it a bond, would it be considered wrong?
It depends on the structure as a whole and the overall charge. Try to make bonds but keeping ion mind the overall charge.
- Sat Oct 26, 2019 9:28 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Stability
- Replies: 9
- Views: 511
Re: Stability
The central atom should be of a charge of 0 for the structure of a molecule top be most stable. As for any charges If the whole electron shell is filled that means it will be at its most stable state.