## Search found 118 matches

Sun Mar 15, 2020 7:56 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Replies: 8
Views: 152

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: 93

### 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: 123

### 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: 57

### 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: 164

### 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: 203

### 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: 91

### 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: 114

### 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: 83

### 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: 373

### 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: 134

### 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: 122

### 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: 16
Views: 477

### 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
Replies: 23
Views: 663

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: 211

### 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: 111

### 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: 179

### 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: 82

### 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: 58

### 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: 37

### 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: 200

### 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: 125

### 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: 54

### 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: 77

### 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)
Replies: 11
Views: 252

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)
Replies: 3
Views: 66

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: 76

### 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: 115

### 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
Replies: 19
Views: 371

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: 30

### 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: 65

### 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: 64

### 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: 24

### 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: 62

### 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: 84

### 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: 140

### 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: 54

### 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: 41

### 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: 174

### 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: 273

### 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: 187

### 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: 93

### 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: 34

### 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: 127

### 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: 102

### 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: 102

### 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: 176

### 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: 84

### 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: 294

### 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: 28

### 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: 13

### 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: 124

### 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: 37

### 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: 23

### 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: 47

### 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: 114

### 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: 546

### 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: 546

### 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: 75

### 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: 948

### 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: 40

### 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: 116

### 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: 682

### 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: 140

### 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: 134

### 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: 113

### 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
Replies: 25
Views: 891

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: 101

### 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: 264

### 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
Replies: 15
Views: 325

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: 199

### 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: 24
Views: 764

### 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: 98

### 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: 508

### 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: 44

### 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: 82

### 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: 96

### 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
Replies: 92
Views: 2107

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: 79

### 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: 205

### 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: 124

### 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: 82

### 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: 77

### 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: 55

### 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: 124

### 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: 182

### 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: 62

### 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: 137

### 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: 319

### 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: 30

### 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: 54

### 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: 60

### 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: 111

### 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: 78

### 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: 53

### 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: 206

### 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: 65

### 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: 35

### 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: 102

### 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: 206

### 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.