Search found 107 matches

by Marni Kahn 1A
Tue Mar 10, 2020 12:06 pm
Forum: General Rate Laws
Topic: pseudo rate laws
Replies: 5
Views: 23

pseudo rate laws

when writing a pseudo rate law, why is the rate constant k denoted as k'(k prime)?
by Marni Kahn 1A
Tue Mar 10, 2020 12:02 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalyst vs intermediate
Replies: 3
Views: 16

Catalyst vs intermediate

how can you tell the difference between a catalyst and an intermediate molecule when looking at elementary reactions?
by Marni Kahn 1A
Tue Mar 10, 2020 12:00 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: catalytic converter
Replies: 2
Views: 8

catalytic converter

What is a catalytic converter and when is it used?
by Marni Kahn 1A
Tue Mar 10, 2020 11:59 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Calculation for pre-exponential factor A
Replies: 3
Views: 8

Calculation for pre-exponential factor A

Are we responsible for knowing how to calculate A, or will the value be given to us?
by Marni Kahn 1A
Tue Mar 10, 2020 11:58 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Activation Energy
Replies: 5
Views: 34

Activation Energy

Why can Activation energy(Ea) replace change in enthalpy(delta H) in the van't hoff equation?
by Marni Kahn 1A
Tue Mar 03, 2020 9:24 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Galvanic cells
Replies: 6
Views: 30

Re: Galvanic cells

Yes galvanic cells are always spontaneous and produce an electric current
by Marni Kahn 1A
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: 42

Re: lnQ vs logQ

Yes both are okay but it is important not to get them mixed up because they equate to different values.
by Marni Kahn 1A
Tue Mar 03, 2020 9:16 am
Forum: General Rate Laws
Topic: rate law definition
Replies: 4
Views: 22

rate law definition

what is meant by a rate law?
by Marni Kahn 1A
Tue Mar 03, 2020 9:12 am
Forum: First Order Reactions
Topic: first order graphs
Replies: 2
Views: 20

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?
by Marni Kahn 1A
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: 22

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.
by Marni Kahn 1A
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: 19

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
by Marni Kahn 1A
Tue Feb 25, 2020 9:30 am
Forum: Balancing Redox Reactions
Topic: adding e-
Replies: 7
Views: 39

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.
by Marni Kahn 1A
Tue Feb 25, 2020 9:28 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Writing Cell diagram
Replies: 2
Views: 22

Re: Writing Cell diagram

I don’t believe it matters, as long as there is a comma separating the two solutions.
by Marni Kahn 1A
Tue Feb 25, 2020 9:26 am
Forum: Balancing Redox Reactions
Topic: Which equation do we flip?
Replies: 6
Views: 36

Re: Which equation do we flip?

If it is a galvanic cell, you flip the equation that will render you a positive Ecell value.
by Marni Kahn 1A
Tue Feb 18, 2020 9:14 am
Forum: Van't Hoff Equation
Topic: K rather than Kc
Replies: 10
Views: 48

Re: K rather than Kc

K is in terms of pressure, whereas Kc is in terms of concentration/molarity.
by Marni Kahn 1A
Tue Feb 18, 2020 9:13 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: importance of -RTlnk
Replies: 7
Views: 53

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
by Marni Kahn 1A
Tue Feb 18, 2020 9:11 am
Forum: Balancing Redox Reactions
Topic: Reduction vs. oxidation
Replies: 29
Views: 119

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.
by Marni Kahn 1A
Tue Feb 18, 2020 9:10 am
Forum: Van't Hoff Equation
Topic: Van't Hoff Temperature Dependence
Replies: 4
Views: 25

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)
by Marni Kahn 1A
Tue Feb 18, 2020 9:08 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: ∆G = ∆Gº + RT lnQ
Replies: 12
Views: 86

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)
by Marni Kahn 1A
Tue Feb 11, 2020 9:09 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: U(total)=(3/2)nrt
Replies: 2
Views: 26

U(total)=(3/2)nrt

Do we use the equation U(total)=(3/2)nrt when the reaction of the system is isothermal?
by Marni Kahn 1A
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: 35

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.
by Marni Kahn 1A
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: 57

Comparing standard molar entropies

Why do larger, more complex molecules possess larger standard entropies than simpler, smaller molecules in the same phase?
by Marni Kahn 1A
Tue Feb 11, 2020 9:00 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: state property
Replies: 4
Views: 24

state property

Is Gibbs Free Energy a state property, and if so why?
by Marni Kahn 1A
Tue Feb 11, 2020 8:59 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Delta S(total)
Replies: 3
Views: 18

Delta S(total)

In what cases does delta S(total)=0?
by Marni Kahn 1A
Tue Feb 04, 2020 9:33 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: negative entropy
Replies: 4
Views: 19

negative entropy

is there such thing as a negative entropy value? if so, what does this mean?
by Marni Kahn 1A
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: 8

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?
by Marni Kahn 1A
Tue Feb 04, 2020 9:10 am
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: isothermal reversible expansion
Replies: 2
Views: 20

isothermal reversible expansion

is the equation delta S=n*R*ln(v2/v1) only used when there has been an isothermal, reversible expansion reaction?
by Marni Kahn 1A
Tue Feb 04, 2020 9:08 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: open system
Replies: 5
Views: 35

open system

why is a car engine considered an open system?
by Marni Kahn 1A
Tue Feb 04, 2020 9:07 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: isolated system
Replies: 8
Views: 43

isolated system

why is a reaction in a bomb calorimeter considered an isolated system?
by Marni Kahn 1A
Tue Feb 04, 2020 9:06 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: closed system
Replies: 7
Views: 33

closed system

why is a sealed beaker of water considered a closed system?
by Marni Kahn 1A
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: 44

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.
by Marni Kahn 1A
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: 21

Standard enthalpy of formation

Why is the standard enthalpy of formation of Carbon in the form of graphite equal to 0?
by Marni Kahn 1A
Tue Jan 28, 2020 9:04 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Bomb calorimetry
Replies: 3
Views: 13

Bomb calorimetry

When do we use bomb calorimeters? When the gas is at constant pressure or volume and why?
by Marni Kahn 1A
Tue Jan 28, 2020 9:03 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat capacity units
Replies: 1
Views: 9

Heat capacity units

Does there need to be a conversion done to go from kJ/Celcius to kJ/Kelvin?
by Marni Kahn 1A
Tue Jan 28, 2020 9:01 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Specific heat as an intensive property
Replies: 2
Views: 10

Specific heat as an intensive property

Why is specific heat capacity an intensive property, but heat capacity is an extensive property?
by Marni Kahn 1A
Wed Jan 22, 2020 2:17 pm
Forum: Phase Changes & Related Calculations
Topic: - and + H values
Replies: 5
Views: 39

- and + H values

Why do exothermic reactions render negative values for delta H, and endothermic reactions render positive values for delta H?
by Marni Kahn 1A
Wed Jan 22, 2020 2:14 pm
Forum: Phase Changes & Related Calculations
Topic: phase transitions
Replies: 3
Views: 38

phase transitions

why does the temperature of a sample remain constant even though heat is being supplied during melting/boiling?
by Marni Kahn 1A
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: 25

state property

why is enthalpy a state property?
by Marni Kahn 1A
Wed Jan 22, 2020 2:10 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Initial concentrations are the same at equilibrium?
Replies: 3
Views: 27

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
by Marni Kahn 1A
Wed Jan 22, 2020 1:14 pm
Forum: Phase Changes & Related Calculations
Topic: enthalpy
Replies: 2
Views: 25

enthalpy

why does steam cause severe burns?
by Marni Kahn 1A
Tue Jan 14, 2020 10:00 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Percentage deprotonation
Replies: 1
Views: 12

Percentage deprotonation

What does a high percentage deprotonation indicate? What does a high percentage protonation indicate?
by Marni Kahn 1A
Tue Jan 14, 2020 9:59 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Autoprolysis
Replies: 9
Views: 55

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?
by Marni Kahn 1A
Tue Jan 14, 2020 9:56 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Weak Bases and Acids
Replies: 2
Views: 13

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.
by Marni Kahn 1A
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: 28

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.
by Marni Kahn 1A
Tue Jan 14, 2020 9:52 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: pKa
Replies: 3
Views: 20

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.
by Marni Kahn 1A
Mon Jan 13, 2020 10:16 am
Forum: Ideal Gases
Topic: equilibrium constant purpose
Replies: 7
Views: 35

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.
by Marni Kahn 1A
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: 20

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...
by Marni Kahn 1A
Mon Jan 13, 2020 10:12 am
Forum: Ideal Gases
Topic: eq at the molecular level
Replies: 4
Views: 31

Re: eq at the molecular level

The reaction rates are equal at equilibrium, which makes the concentrations of reactants and products constant.
by Marni Kahn 1A
Mon Jan 13, 2020 10:11 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Units for Q- HW 5I.11
Replies: 3
Views: 21

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
by Marni Kahn 1A
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: 37

Re: Which liquids to use

I think that you were getting confused with aqueous solutions, which are included in K calculations
by Marni Kahn 1A
Tue Jan 07, 2020 8:50 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Composition of equilibrium mixture
Replies: 2
Views: 24

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?
by Marni Kahn 1A
Tue Jan 07, 2020 8:44 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Heterogenous vs. Homogenous equations
Replies: 6
Views: 41

Heterogenous vs. Homogenous equations

What is the difference between homogenous and heterogenous equilibria?
by Marni Kahn 1A
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: 49

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?
by Marni Kahn 1A
Tue Jan 07, 2020 8:37 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Reaction quotient (Q)
Replies: 3
Views: 38

Reaction quotient (Q)

What happens when Q>K, Q<K, and Q=K, and why?
by Marni Kahn 1A
Tue Jan 07, 2020 8:35 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Using the "ICE" box
Replies: 8
Views: 67

Re: Using the "ICE" box

solids and liquids are not included in the "ICE" box calculations.
by Marni Kahn 1A
Mon Dec 02, 2019 2:07 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Inorganic vs organic
Replies: 3
Views: 30

Re: Inorganic vs organic

Organic molecules contain both hydrogen and oxygen
by Marni Kahn 1A
Mon Dec 02, 2019 2:06 pm
Forum: Lewis Acids & Bases
Topic: Relationship between Bronsted and Lewis Acids and Bases
Replies: 2
Views: 24

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
by Marni Kahn 1A
Mon Dec 02, 2019 2:05 pm
Forum: Identifying Acidic & Basic Salts
Topic: Acid protonation
Replies: 4
Views: 37

Acid protonation

Why does an acid get protonated when the pH of its solution is greater than the pka of the acid?
by Marni Kahn 1A
Mon Dec 02, 2019 2:00 pm
Forum: Identifying Acidic & Basic Salts
Topic: Cations groups 1 and 2
Replies: 2
Views: 25

Cations groups 1 and 2

Why are cations from groups 1 and 2 considered too weak to form acidic solutions?
by Marni Kahn 1A
Mon Dec 02, 2019 1:57 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Pka
Replies: 2
Views: 27

Pka

What does the Pka tell us that the pka doesn't?
by Marni Kahn 1A
Thu Nov 28, 2019 6:44 pm
Forum: Amphoteric Compounds
Topic: Examples of amphoteric compounds
Replies: 5
Views: 33

Examples of amphoteric compounds

Are we responsible for memorizing the amphoteric compounds shown to us in class, or should we just understand their importance?
by Marni Kahn 1A
Thu Nov 28, 2019 6:42 pm
Forum: Lewis Acids & Bases
Topic: Lewis v Bronsted acids/bases
Replies: 2
Views: 26

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?
by Marni Kahn 1A
Thu Nov 28, 2019 6:40 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Constant K(a)
Replies: 4
Views: 43

Constant K(a)

Are we responsible for knowing how to calculate K(a), or just knowing its significance?
by Marni Kahn 1A
Thu Nov 28, 2019 6:37 pm
Forum: Polyprotic Acids & Bases
Topic: strength of polyprotic acids/bases
Replies: 2
Views: 30

strength of polyprotic acids/bases

Are polyprotic acids/bases necessarily stronger than monoprotic acids/bases?
by Marni Kahn 1A
Thu Nov 28, 2019 6:35 pm
Forum: Naming
Topic: -ido vs -o
Replies: 5
Views: 48

-ido vs -o

is there a difference between chlorido and chloro, florido and fluoro, or cyanido and cyano?
by Marni Kahn 1A
Wed Nov 20, 2019 10:21 am
Forum: Hybridization
Topic: hybridizing f-orbitals
Replies: 1
Views: 14

hybridizing f-orbitals

are there any instances where f-orbitals are hybridized or do we not have to know that?
by Marni Kahn 1A
Wed Nov 20, 2019 10:17 am
Forum: Hybridization
Topic: lone pairs in hybridization
Replies: 8
Views: 47

lone pairs in hybridization

can lone pairs on the central atom be hybridized?
by Marni Kahn 1A
Wed Nov 20, 2019 10:16 am
Forum: Hybridization
Topic: electron promotion
Replies: 1
Views: 23

electron promotion

can any other atoms besides Carbon atoms be "promoted" to increase bond formation?
by Marni Kahn 1A
Wed Nov 20, 2019 10:13 am
Forum: Hybridization
Topic: pi bond orientation
Replies: 4
Views: 42

pi bond orientation

why do pi bonds inhibit rotation of a molecule?
by Marni Kahn 1A
Wed Nov 20, 2019 10:12 am
Forum: Hybridization
Topic: unhybridized p-orbitals
Replies: 2
Views: 24

unhybridized p-orbitals

why aren't p-orbitals hybridized?
by Marni Kahn 1A
Wed Nov 13, 2019 1:56 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Linear VSEPR model
Replies: 21
Views: 177

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?
by Marni Kahn 1A
Wed Nov 13, 2019 1:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Resonance VSEPR
Replies: 6
Views: 40

Resonance VSEPR

Does it matter which resonance structure we use when studying the VSEPR model?
by Marni Kahn 1A
Wed Nov 13, 2019 1:52 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sulfur Hexafluoride VSEPR
Replies: 3
Views: 30

Sulfur Hexafluoride VSEPR

Why does SF6 have an octahedral shape?
by Marni Kahn 1A
Wed Nov 13, 2019 1:50 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Methane VSEPR
Replies: 7
Views: 53

Methane VSEPR

How are all of the bond angles of Methane, CH4, 109.5 degrees?
by Marni Kahn 1A
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: 18

Boiling Points

Why do the boiling points increase down group 17 when the atoms are bonded to a Hydrogen atom?
by Marni Kahn 1A
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: 46

Dispersion forces

Why does the strength of a dispersion force depend on the polarizability of the atoms in a molecule?
by Marni Kahn 1A
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: 26

London Forces

Are London interactions between rod-shaped molecules stronger than london interactions between spherical molecules and if so, why?
by Marni Kahn 1A
Wed Oct 30, 2019 10:15 am
Forum: Electronegativity
Topic: Partial Charges
Replies: 1
Views: 34

Partial Charges

Are we responsible for knowing how to calculate the partial charge of an atom in a molecule?
by Marni Kahn 1A
Wed Oct 30, 2019 10:13 am
Forum: Ionic & Covalent Bonds
Topic: polarizability
Replies: 1
Views: 18

polarizability

What does it mean when elements have a high polarizability?
by Marni Kahn 1A
Wed Oct 30, 2019 10:10 am
Forum: Dipole Moments
Topic: Boiling Points
Replies: 1
Views: 8

Boiling Points

Why do london forces cause boiling points of molecules to increase down a group?
by Marni Kahn 1A
Wed Oct 30, 2019 10:08 am
Forum: Dipole Moments
Topic: London Forces
Replies: 1
Views: 15

London Forces

Do London Interactions increase or decrease down a group and why?
by Marni Kahn 1A
Wed Oct 30, 2019 10:05 am
Forum: Lewis Structures
Topic: Valence electrons
Replies: 5
Views: 53

Re: Valence electrons

PCl5 (phosphorus pentachloride), since P has 10 valence electrons
by Marni Kahn 1A
Wed Oct 23, 2019 4:37 pm
Forum: Resonance Structures
Topic: Bond types
Replies: 2
Views: 30

Bond types

Which bond (single, double, triple) is the most stable and why?
by Marni Kahn 1A
Wed Oct 23, 2019 4:36 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 14
Views: 93

Electronegativity

What exactly is electronegativity and why does it increase across a period from left to right?
by Marni Kahn 1A
Wed Oct 23, 2019 4:32 pm
Forum: Ionic & Covalent Bonds
Topic: d-block elements
Replies: 1
Views: 60

d-block elements

Do d block elements tend to gain or lose electrons to have the configuration of a noble gas?
by Marni Kahn 1A
Wed Oct 23, 2019 4:29 pm
Forum: Lewis Structures
Topic: Exceptions
Replies: 3
Views: 29

Exceptions

Why are Helium, Lithium, Beryllium, and Hydrogen exceptions to the lewis dot structure in terms of creating an octet for each atom
by Marni Kahn 1A
Wed Oct 23, 2019 4:26 pm
Forum: Ionic & Covalent Bonds
Topic: Lewis Structures
Replies: 3
Views: 45

Lewis Structures

Why does the element with the lowest IE go in the middle when drawing Lewis Dot structures?
by Marni Kahn 1A
Wed Oct 16, 2019 4:20 pm
Forum: Trends in The Periodic Table
Topic: Atomic radii
Replies: 9
Views: 65

Atomic radii

Why do atomic radii generally decrease from left to right across a period if the atomic number is increasing(# of electrons/protons)?
by Marni Kahn 1A
Wed Oct 16, 2019 4:17 pm
Forum: Trends in The Periodic Table
Topic: Ionic radii
Replies: 11
Views: 74

Ionic radii

Why do ionic radii generally increase down a group?
by Marni Kahn 1A
Wed Oct 16, 2019 4:14 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Magnetic Quantum
Replies: 2
Views: 18

Magnetic Quantum

Does it matter the order in which we assign the m values(l,l-1...-l) to the orbitals of a subshell?
by Marni Kahn 1A
Wed Oct 16, 2019 4:05 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Energy levels
Replies: 3
Views: 33

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?
by Marni Kahn 1A
Wed Oct 16, 2019 3:53 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Magnetic Quantum Number
Replies: 3
Views: 28

Re: Magnetic Quantum Number

The x is an arbitrarily assigned variable that represents the value of m
by Marni Kahn 1A
Wed Oct 09, 2019 10:35 am
Forum: Properties of Light
Topic: Double-slit experiment
Replies: 2
Views: 39

Double-slit experiment

What did the double-slit/diffraction experiment prove, and with what equations can we associate the experiment?
by Marni Kahn 1A
Wed Oct 09, 2019 10:29 am
Forum: DeBroglie Equation
Topic: Momentum
Replies: 4
Views: 48

Momentum

Why is momentum involved in the debrogile equation if the mass of a particle is so tiny and isn't that significant?
by Marni Kahn 1A
Wed Oct 09, 2019 10:24 am
Forum: Properties of Electrons
Topic: Balmer/Lyman series
Replies: 5
Views: 44

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?
by Marni Kahn 1A
Wed Oct 09, 2019 10:21 am
Forum: Properties of Electrons
Topic: Ionization energy
Replies: 4
Views: 53

Ionization energy

Why does the ionization energy generally increase across a period from left to right?

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