Search found 107 matches
- Tue Mar 10, 2020 12:06 pm
- Forum: General Rate Laws
- Topic: pseudo rate laws
- Replies: 5
- Views: 341
pseudo rate laws
when writing a pseudo rate law, why is the rate constant k denoted as k'(k prime)?
- Tue Mar 10, 2020 12:02 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalyst vs intermediate
- Replies: 3
- Views: 346
Catalyst vs intermediate
how can you tell the difference between a catalyst and an intermediate molecule when looking at elementary reactions?
- Tue Mar 10, 2020 12:00 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: catalytic converter
- Replies: 2
- Views: 270
catalytic converter
What is a catalytic converter and when is it used?
- Tue Mar 10, 2020 11:59 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Calculation for pre-exponential factor A
- Replies: 3
- Views: 321
Calculation for pre-exponential factor A
Are we responsible for knowing how to calculate A, or will the value be given to us?
- Tue Mar 10, 2020 11:58 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Activation Energy
- Replies: 17
- Views: 989
Activation Energy
Why can Activation energy(Ea) replace change in enthalpy(delta H) in the van't hoff equation?
- Tue Mar 03, 2020 9:24 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Galvanic cells
- Replies: 6
- Views: 500
Re: Galvanic cells
Yes galvanic cells are always spontaneous and produce an electric current
- Tue Mar 03, 2020 9:23 am
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: lnQ vs logQ
- Replies: 5
- Views: 381
Re: lnQ vs logQ
Yes both are okay but it is important not to get them mixed up because they equate to different values.
- Tue Mar 03, 2020 9:21 am
- Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
- Topic: 6O.1
- Replies: 1
- Views: 164
Re: 6O.1
Yes I think that minimum potential means the Standard E cell
- Tue Mar 03, 2020 9:16 am
- Forum: General Rate Laws
- Topic: rate law definition
- Replies: 4
- Views: 396
rate law definition
what is meant by a rate law?
- Tue Mar 03, 2020 9:12 am
- Forum: First Order Reactions
- Topic: first order graphs
- Replies: 2
- Views: 267
first order graphs
do we have to know the graph of [A] vs time or just ln[A] vs time for the first order rate law and integrated rate law?
- Tue Feb 25, 2020 9:36 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Pt in cell diagram
- Replies: 1
- Views: 187
Re: Pt in cell diagram
You include Pt when there is no other ironically conducting solid to transport electrons. Pt as a solid is included on either end of the cell diagram, as solids are typically on the end of the cell diagrams.
- Tue Feb 25, 2020 9:33 am
- Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
- Topic: Charging
- Replies: 2
- Views: 199
Re: Charging
Whereas galvanic cells produce a current as a result of spontaneous reactions taking place, electrolytic cells require a current to initiate a non spontaneous reaction. Batteries are galvanic cells since the voltage produced is produced without any additional current required
- Tue Feb 25, 2020 9:30 am
- Forum: Balancing Redox Reactions
- Topic: adding e-
- Replies: 7
- Views: 594
Re: adding e-
You add electrons to the reactant side of reduction reactions because that substance is gaining electrons. Conversely, you add electrons to the product side of oxidation reactions since that substance is losing electrons.
- Tue Feb 25, 2020 9:28 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Writing Cell diagram
- Replies: 2
- Views: 196
Re: Writing Cell diagram
I don’t believe it matters, as long as there is a comma separating the two solutions.
- Tue Feb 25, 2020 9:26 am
- Forum: Balancing Redox Reactions
- Topic: Which equation do we flip?
- Replies: 6
- Views: 406
Re: Which equation do we flip?
If it is a galvanic cell, you flip the equation that will render you a positive Ecell value.
- Tue Feb 18, 2020 9:14 am
- Forum: Van't Hoff Equation
- Topic: K rather than Kc
- Replies: 10
- Views: 766
Re: K rather than Kc
K is in terms of pressure, whereas Kc is in terms of concentration/molarity.
- Tue Feb 18, 2020 9:13 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: importance of -RTlnk
- Replies: 7
- Views: 477
Re: importance of -RTlnk
it demonstrates how K depends on temperature when combined with the gibb's free energy equation Δ G = Δ H − T Δ S
- Tue Feb 18, 2020 9:11 am
- Forum: Balancing Redox Reactions
- Topic: Reduction vs. oxidation
- Replies: 29
- Views: 1210
Re: Reduction vs. oxidation
You can break down the equation you are given into two different equations to determine how the charges on the molecules change.
- Tue Feb 18, 2020 9:10 am
- Forum: Van't Hoff Equation
- Topic: Van't Hoff Temperature Dependence
- Replies: 4
- Views: 409
Re: Van't Hoff Temperature Dependence
You have the natural log in the equation already given ∆G=∆G°+RTlnQ, and then ∆G°=-RTlnK at equilibrium(∆G=0 at equilibrium)
- Tue Feb 18, 2020 9:08 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: ∆G = ∆Gº + RT lnQ
- Replies: 12
- Views: 2627
Re: ∆G = ∆Gº + RT lnQ
∆G is the change of Gibbs (free) energy for a system and ∆G° is the Gibbs energy change for a system under standard conditions (1 atm, 298K)
- Tue Feb 11, 2020 9:09 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: U(total)=(3/2)nrt
- Replies: 2
- Views: 205
U(total)=(3/2)nrt
Do we use the equation U(total)=(3/2)nrt when the reaction of the system is isothermal?
- Tue Feb 11, 2020 9:04 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: 4E.5
- Replies: 4
- Views: 271
Re: 4E.5
I typically draw out all of the compounds in the reaction and then observe which bonds must break in order to form those on the products side.
- Tue Feb 11, 2020 9:02 am
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Comparing standard molar entropies
- Replies: 6
- Views: 490
Comparing standard molar entropies
Why do larger, more complex molecules possess larger standard entropies than simpler, smaller molecules in the same phase?
- Tue Feb 11, 2020 9:00 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: state property
- Replies: 4
- Views: 220
state property
Is Gibbs Free Energy a state property, and if so why?
- Tue Feb 11, 2020 8:59 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Delta S(total)
- Replies: 3
- Views: 99
Delta S(total)
In what cases does delta S(total)=0?
- Tue Feb 04, 2020 9:33 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: negative entropy
- Replies: 4
- Views: 178
negative entropy
is there such thing as a negative entropy value? if so, what does this mean?
- Tue Feb 04, 2020 9:13 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Total internal energy calculation(Utotal)
- Replies: 1
- Views: 185
Total internal energy calculation(Utotal)
is the equation U(total)=(3/2)n*R*T only used when there has been an isothermal reversible expansion reaction?
- Tue Feb 04, 2020 9:10 am
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: isothermal reversible expansion
- Replies: 2
- Views: 118
isothermal reversible expansion
is the equation delta S=n*R*ln(v2/v1) only used when there has been an isothermal, reversible expansion reaction?
- Tue Feb 04, 2020 9:08 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: open system
- Replies: 5
- Views: 449
open system
why is a car engine considered an open system?
- Tue Feb 04, 2020 9:07 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: isolated system
- Replies: 8
- Views: 505
isolated system
why is a reaction in a bomb calorimeter considered an isolated system?
- Tue Feb 04, 2020 9:06 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: closed system
- Replies: 7
- Views: 385
closed system
why is a sealed beaker of water considered a closed system?
- Tue Jan 28, 2020 9:09 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Bond Enthalpies
- Replies: 11
- Views: 302
Re: Bond Enthalpies
It is also important to take into consideration that some reactions require a change in enthalpy due to a phase change in addition to the substances' bond enthalpies. In this way, Hess's method is more efficient and not as time costly because the enthalpy changes are already given.
- Tue Jan 28, 2020 9:06 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Standard enthalpy of formation
- Replies: 3
- Views: 146
Standard enthalpy of formation
Why is the standard enthalpy of formation of Carbon in the form of graphite equal to 0?
- Tue Jan 28, 2020 9:04 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Bomb calorimetry
- Replies: 3
- Views: 130
Bomb calorimetry
When do we use bomb calorimeters? When the gas is at constant pressure or volume and why?
- Tue Jan 28, 2020 9:03 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Heat capacity units
- Replies: 1
- Views: 65
Heat capacity units
Does there need to be a conversion done to go from kJ/Celcius to kJ/Kelvin?
- Tue Jan 28, 2020 9:01 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Specific heat as an intensive property
- Replies: 2
- Views: 91
Specific heat as an intensive property
Why is specific heat capacity an intensive property, but heat capacity is an extensive property?
- Wed Jan 22, 2020 2:17 pm
- Forum: Phase Changes & Related Calculations
- Topic: - and + H values
- Replies: 5
- Views: 171
- and + H values
Why do exothermic reactions render negative values for delta H, and endothermic reactions render positive values for delta H?
- Wed Jan 22, 2020 2:14 pm
- Forum: Phase Changes & Related Calculations
- Topic: phase transitions
- Replies: 3
- Views: 121
phase transitions
why does the temperature of a sample remain constant even though heat is being supplied during melting/boiling?
- Wed Jan 22, 2020 2:12 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: state property
- Replies: 5
- Views: 136
state property
why is enthalpy a state property?
- Wed Jan 22, 2020 2:10 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Initial concentrations are the same at equilibrium?
- Replies: 3
- Views: 110
Re: Initial concentrations are the same at equilibrium?
This is seen quite often because we do a lot of examples with an infinitesimally small value of Ka
- Wed Jan 22, 2020 1:14 pm
- Forum: Phase Changes & Related Calculations
- Topic: enthalpy
- Replies: 2
- Views: 69
enthalpy
why does steam cause severe burns?
- Tue Jan 14, 2020 10:00 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Percentage deprotonation
- Replies: 1
- Views: 76
Percentage deprotonation
What does a high percentage deprotonation indicate? What does a high percentage protonation indicate?
- Tue Jan 14, 2020 9:59 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Autoprolysis
- Replies: 9
- Views: 686
Autoprolysis
Are there any other examples besides H20 that demonstrates autoprolysis (one molecule transfers a proton to another molecule of the same kind) and are significant?
- Tue Jan 14, 2020 9:56 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Weak Bases and Acids
- Replies: 2
- Views: 86
Re: Weak Bases and Acids
The higher the Kb value, the more basic a substance is. The higher the Ka value, the more acidic a substance is.
- Tue Jan 14, 2020 9:55 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Temperature change
- Replies: 5
- Views: 119
Re: Temperature change
ALegala_2I wrote:Why do changes in concentration, pressure, and volume have no effect on the K value?
The constant K is temperature-dependent, meaning that only changes in temperature will affect the value of K.
- Tue Jan 14, 2020 9:52 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: pKa
- Replies: 3
- Views: 124
Re: pKa
The pKa and pKb values indicate the strength of acids and bases. The lower the pKa value, the stronger the acid. The lower the pKb value, the stronger the base.
- Mon Jan 13, 2020 10:16 am
- Forum: Ideal Gases
- Topic: equilibrium constant purpose
- Replies: 7
- Views: 228
Re: equilibrium constant purpose
K is also important because if given K and initial concentrations of one or more reactants, you can use that K value to find the composition of the mixture at equilibrium.
- Mon Jan 13, 2020 10:14 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Change in Pressure
- Replies: 6
- Views: 207
Re: Change in Pressure
An important thing to consider when there is a change in pressure is how the pressure has changed. If it has changed by adding an inert gas, then the equilibrium is unaffected. However, if there is a change in pressure by adjusting the volume, then see how that change in volume affects the concentra...
- Mon Jan 13, 2020 10:12 am
- Forum: Ideal Gases
- Topic: eq at the molecular level
- Replies: 4
- Views: 255
Re: eq at the molecular level
The reaction rates are equal at equilibrium, which makes the concentrations of reactants and products constant.
- Mon Jan 13, 2020 10:11 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Units for Q- HW 5I.11
- Replies: 3
- Views: 197
Re: Units for Q- HW 5I.11
assume K and Q are measured in units used for gasses, unless it is specified to calculate Kc or Qc values which use mol/liter
- Mon Jan 13, 2020 10:09 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Which liquids to use
- Replies: 7
- Views: 201
Re: Which liquids to use
I think that you were getting confused with aqueous solutions, which are included in K calculations
- Tue Jan 07, 2020 8:50 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Composition of equilibrium mixture
- Replies: 2
- Views: 118
Composition of equilibrium mixture
When finding the composition of an equilibrium mixture, what do you do if the equation becomes a cubic instead of a quadratic?
- Tue Jan 07, 2020 8:44 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Heterogenous vs. Homogenous equations
- Replies: 6
- Views: 297
Heterogenous vs. Homogenous equations
What is the difference between homogenous and heterogenous equilibria?
- Tue Jan 07, 2020 8:42 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Pressure changes to equilibrium equations
- Replies: 5
- Views: 259
Pressure changes to equilibrium equations
When a mixture is compressed, causing the volume to decrease, and there are more moles of gas on the reactant side of the equilibrium equation, which way does the equation shift and why?
- Tue Jan 07, 2020 8:37 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Reaction quotient (Q)
- Replies: 3
- Views: 218
Reaction quotient (Q)
What happens when Q>K, Q<K, and Q=K, and why?
- Tue Jan 07, 2020 8:35 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Using the "ICE" box
- Replies: 8
- Views: 262
Re: Using the "ICE" box
solids and liquids are not included in the "ICE" box calculations.
- Mon Dec 02, 2019 2:07 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Inorganic vs organic
- Replies: 3
- Views: 233
Re: Inorganic vs organic
Organic molecules contain both hydrogen and oxygen
- Mon Dec 02, 2019 2:06 pm
- Forum: Lewis Acids & Bases
- Topic: Relationship between Bronsted and Lewis Acids and Bases
- Replies: 2
- Views: 91
Re: Relationship between Bronsted and Lewis Acids and Bases
The textbook says that every Bronsted base is a lewis base, because if a molecule is accepting an H+ then it is also donating e- to fill the H+ empty shell
- Mon Dec 02, 2019 2:05 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: Acid protonation
- Replies: 4
- Views: 351
Acid protonation
Why does an acid get protonated when the pH of its solution is greater than the pka of the acid?
- Mon Dec 02, 2019 2:00 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: Cations groups 1 and 2
- Replies: 2
- Views: 219
Cations groups 1 and 2
Why are cations from groups 1 and 2 considered too weak to form acidic solutions?
- Mon Dec 02, 2019 1:57 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Pka
- Replies: 2
- Views: 219
Pka
What does the Pka tell us that the pka doesn't?
- Thu Nov 28, 2019 6:44 pm
- Forum: Amphoteric Compounds
- Topic: Examples of amphoteric compounds
- Replies: 5
- Views: 342
Examples of amphoteric compounds
Are we responsible for memorizing the amphoteric compounds shown to us in class, or should we just understand their importance?
- Thu Nov 28, 2019 6:42 pm
- Forum: Lewis Acids & Bases
- Topic: Lewis v Bronsted acids/bases
- Replies: 2
- Views: 228
Lewis v Bronsted acids/bases
Are all lewis acids/bases considered to be Bronsted acids/bases? Are all Bronsted acids/bases considered to be Lewis acids/bases?
- Thu Nov 28, 2019 6:40 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Constant K(a)
- Replies: 4
- Views: 283
Constant K(a)
Are we responsible for knowing how to calculate K(a), or just knowing its significance?
- Thu Nov 28, 2019 6:37 pm
- Forum: Polyprotic Acids & Bases
- Topic: strength of polyprotic acids/bases
- Replies: 2
- Views: 179
strength of polyprotic acids/bases
Are polyprotic acids/bases necessarily stronger than monoprotic acids/bases?
- Thu Nov 28, 2019 6:35 pm
- Forum: Naming
- Topic: -ido vs -o
- Replies: 5
- Views: 345
-ido vs -o
is there a difference between chlorido and chloro, florido and fluoro, or cyanido and cyano?
- Wed Nov 20, 2019 10:21 am
- Forum: Hybridization
- Topic: hybridizing f-orbitals
- Replies: 1
- Views: 160
hybridizing f-orbitals
are there any instances where f-orbitals are hybridized or do we not have to know that?
- Wed Nov 20, 2019 10:17 am
- Forum: Hybridization
- Topic: lone pairs in hybridization
- Replies: 8
- Views: 544
lone pairs in hybridization
can lone pairs on the central atom be hybridized?
- Wed Nov 20, 2019 10:16 am
- Forum: Hybridization
- Topic: electron promotion
- Replies: 1
- Views: 77
electron promotion
can any other atoms besides Carbon atoms be "promoted" to increase bond formation?
- Wed Nov 20, 2019 10:13 am
- Forum: Hybridization
- Topic: pi bond orientation
- Replies: 4
- Views: 153
pi bond orientation
why do pi bonds inhibit rotation of a molecule?
- Wed Nov 20, 2019 10:12 am
- Forum: Hybridization
- Topic: unhybridized p-orbitals
- Replies: 2
- Views: 190
unhybridized p-orbitals
why aren't p-orbitals hybridized?
- Wed Nov 13, 2019 1:56 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Linear VSEPR model
- Replies: 21
- Views: 1353
Linear VSEPR model
I know that when the central atom has only two bonding pairs as far as possible, forming an 180 degree angle, it is considered to be a linear shape, but what if the central atom has lone pairs in addition to the two bonds?
- Wed Nov 13, 2019 1:53 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Resonance VSEPR
- Replies: 6
- Views: 259
Resonance VSEPR
Does it matter which resonance structure we use when studying the VSEPR model?
- Wed Nov 13, 2019 1:52 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Sulfur Hexafluoride VSEPR
- Replies: 3
- Views: 744
Sulfur Hexafluoride VSEPR
Why does SF6 have an octahedral shape?
- Wed Nov 13, 2019 1:50 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Methane VSEPR
- Replies: 7
- Views: 419
Methane VSEPR
How are all of the bond angles of Methane, CH4, 109.5 degrees?
- Wed Nov 13, 2019 1:47 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: Induced dipole-induced dipole
- Replies: 1
- Views: 175
Induced dipole-induced dipole
Why does every molecule possess the induced dipole-induced dipole force?
- Thu Nov 07, 2019 11:24 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: Comparing forces of attraction
- Replies: 4
- Views: 250
Comparing forces of attraction
Are hydrogen bonds or dipole-dipole attractions stronger and why?
- Thu Nov 07, 2019 11:21 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: Boiling Points
- Replies: 1
- Views: 94
Boiling Points
Why do the boiling points increase down group 17 when the atoms are bonded to a Hydrogen atom?
- Thu Nov 07, 2019 11:19 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: Instantaneous dipole moment
- Replies: 5
- Views: 176
Instantaneous dipole moment
How long does an instantaneous dipole moment typically last?
- Thu Nov 07, 2019 11:18 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: Dispersion forces
- Replies: 6
- Views: 245
Dispersion forces
Why does the strength of a dispersion force depend on the polarizability of the atoms in a molecule?
- Thu Nov 07, 2019 11:17 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: London Forces
- Replies: 1
- Views: 145
London Forces
Are London interactions between rod-shaped molecules stronger than london interactions between spherical molecules and if so, why?
- Wed Oct 30, 2019 10:15 am
- Forum: Electronegativity
- Topic: Partial Charges
- Replies: 1
- Views: 189
Partial Charges
Are we responsible for knowing how to calculate the partial charge of an atom in a molecule?
- Wed Oct 30, 2019 10:13 am
- Forum: Ionic & Covalent Bonds
- Topic: polarizability
- Replies: 1
- Views: 127
polarizability
What does it mean when elements have a high polarizability?
- Wed Oct 30, 2019 10:10 am
- Forum: Dipole Moments
- Topic: Boiling Points
- Replies: 1
- Views: 87
Boiling Points
Why do london forces cause boiling points of molecules to increase down a group?
- Wed Oct 30, 2019 10:08 am
- Forum: Dipole Moments
- Topic: London Forces
- Replies: 1
- Views: 85
London Forces
Do London Interactions increase or decrease down a group and why?
- Wed Oct 30, 2019 10:05 am
- Forum: Lewis Structures
- Topic: Valence electrons
- Replies: 5
- Views: 236
Re: Valence electrons
PCl5 (phosphorus pentachloride), since P has 10 valence electrons
- Wed Oct 23, 2019 4:37 pm
- Forum: Resonance Structures
- Topic: Bond types
- Replies: 2
- Views: 75
Bond types
Which bond (single, double, triple) is the most stable and why?
- Wed Oct 23, 2019 4:36 pm
- Forum: Electronegativity
- Topic: Electronegativity
- Replies: 14
- Views: 664
Electronegativity
What exactly is electronegativity and why does it increase across a period from left to right?
- Wed Oct 23, 2019 4:32 pm
- Forum: Ionic & Covalent Bonds
- Topic: d-block elements
- Replies: 1
- Views: 112
d-block elements
Do d block elements tend to gain or lose electrons to have the configuration of a noble gas?
- Wed Oct 23, 2019 4:29 pm
- Forum: Lewis Structures
- Topic: Exceptions
- Replies: 3
- Views: 93
Exceptions
Why are Helium, Lithium, Beryllium, and Hydrogen exceptions to the lewis dot structure in terms of creating an octet for each atom
- Wed Oct 23, 2019 4:26 pm
- Forum: Ionic & Covalent Bonds
- Topic: Lewis Structures
- Replies: 3
- Views: 136
Lewis Structures
Why does the element with the lowest IE go in the middle when drawing Lewis Dot structures?
- Wed Oct 16, 2019 4:20 pm
- Forum: Trends in The Periodic Table
- Topic: Atomic radii
- Replies: 9
- Views: 533
Atomic radii
Why do atomic radii generally decrease from left to right across a period if the atomic number is increasing(# of electrons/protons)?
- Wed Oct 16, 2019 4:17 pm
- Forum: Trends in The Periodic Table
- Topic: Ionic radii
- Replies: 11
- Views: 375
Ionic radii
Why do ionic radii generally increase down a group?
- Wed Oct 16, 2019 4:14 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Magnetic Quantum
- Replies: 2
- Views: 108
Magnetic Quantum
Does it matter the order in which we assign the m values(l,l-1...-l) to the orbitals of a subshell?
- Wed Oct 16, 2019 4:05 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Energy levels
- Replies: 3
- Views: 249
Energy levels
Does the d orbital of an n=4 shell have a higher energy level than the p orbital of an n=5 even though it is filled before the p orbital?
- Wed Oct 16, 2019 3:53 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Magnetic Quantum Number
- Replies: 3
- Views: 135
Re: Magnetic Quantum Number
The x is an arbitrarily assigned variable that represents the value of m
- Wed Oct 09, 2019 10:35 am
- Forum: Properties of Light
- Topic: Double-slit experiment
- Replies: 2
- Views: 117
Double-slit experiment
What did the double-slit/diffraction experiment prove, and with what equations can we associate the experiment?
- Wed Oct 09, 2019 10:29 am
- Forum: DeBroglie Equation
- Topic: Momentum
- Replies: 4
- Views: 136
Momentum
Why is momentum involved in the debrogile equation if the mass of a particle is so tiny and isn't that significant?
- Wed Oct 09, 2019 10:24 am
- Forum: Properties of Electrons
- Topic: Balmer/Lyman series
- Replies: 5
- Views: 306
Balmer/Lyman series
Do we need to be familiar with the Balmer and Lyman series in terms of which energy levels are associated with n1, and in what type of light they occur?
- Wed Oct 09, 2019 10:21 am
- Forum: Properties of Electrons
- Topic: Ionization energy
- Replies: 4
- Views: 170
Ionization energy
Why does the ionization energy generally increase across a period from left to right?