Search found 62 matches

by Madison Hurst
Sun Mar 17, 2019 12:39 am
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 6753

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

For kinetics ws pt 1 number 5 why isn't C included in the rate law? Is it an intermediate? if so, how can you tell?
by Madison Hurst
Sun Mar 17, 2019 12:29 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: Units k
Replies: 1
Views: 117

Units k

how do you determine units for rate constant?
by Madison Hurst
Sat Mar 16, 2019 11:23 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: ln k and 1/t
Replies: 3
Views: 126

Re: ln k and 1/t

yes
by Madison Hurst
Sat Mar 16, 2019 11:21 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Elementary Rxns
Replies: 2
Views: 129

Elementary Rxns

what would the rate law be for 2A+2B->C be? Do you use the coefficients given for the order or no?
by Madison Hurst
Sat Mar 16, 2019 11:13 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Ea
Replies: 1
Views: 104

Ea

What is the explicit equation for activation energy?
by Madison Hurst
Sat Mar 16, 2019 10:58 pm
Forum: Experimental Details
Topic: Rate law in multiple step reactions [ENDORSED]
Replies: 3
Views: 320

Re: Rate law in multiple step reactions [ENDORSED]

You must replace the intermediates with their equal rate law expressions using the molar ratios when needed.
by Madison Hurst
Sat Mar 16, 2019 10:49 pm
Forum: First Order Reactions
Topic: pseudo first order [ENDORSED]
Replies: 5
Views: 219

Re: pseudo first order [ENDORSED]

So is it technically a second order reaction, but because one of the concentrations is so big its basically constant?
by Madison Hurst
Sat Mar 16, 2019 10:46 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Orientation
Replies: 2
Views: 121

Orientation

What are the notes referring to when they say the orientations of colliding molecules must be the same?
by Madison Hurst
Sat Mar 16, 2019 10:45 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Units and order
Replies: 1
Views: 104

Units and order

Can the order of the reaction be determined by the units? I saw something that to solve for n (order) you can use M^1-n ?
by Madison Hurst
Sat Mar 16, 2019 10:37 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: ln k and 1/t
Replies: 3
Views: 126

ln k and 1/t

When is the profile lnk vs 1/t and when is the profile lnk vs t?
by Madison Hurst
Sat Mar 16, 2019 7:44 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Transition State
Replies: 3
Views: 41

Transition State

What is the transition state and where does it go on the profile?
by Madison Hurst
Sat Mar 16, 2019 7:39 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Ka and K
Replies: 1
Views: 114

Ka and K

What are the steps to find Ka after solving for K in the Nernst equation?
by Madison Hurst
Sat Mar 16, 2019 7:34 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Reaction Profiles
Replies: 1
Views: 39

Reaction Profiles

How does the profile change if it is endergonic vs exergonic?
by Madison Hurst
Sat Mar 16, 2019 7:33 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Approaches to mechanisms
Replies: 2
Views: 45

Approaches to mechanisms

What is the difference between steady state and pre eq approaches?
by Madison Hurst
Sat Mar 16, 2019 7:29 pm
Forum: General Rate Laws
Topic: Rate Constant
Replies: 1
Views: 97

Rate Constant

what is the relationship between rate of reaction, rate constant, and half life?
by Madison Hurst
Sat Mar 16, 2019 6:19 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: E* +/-
Replies: 1
Views: 86

E* +/-

Should the calculated E* value when adding E*s from half reactions always be positive?
by Madison Hurst
Sat Mar 16, 2019 6:18 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Inert Conductor
Replies: 3
Views: 39

Inert Conductor

How do you know which inert conductor to add Pt vs Hg?
by Madison Hurst
Sat Mar 16, 2019 6:16 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Standard of Formation
Replies: 1
Views: 122

Standard of Formation

How do you know if you're are given the standard free energy of formation versus just free energy?
by Madison Hurst
Sat Mar 16, 2019 6:13 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Calculating E*
Replies: 1
Views: 99

Calculating E*

When can you add the E* for each half reaction to get the cell E* and when can you not add them because its not a state function? This came up in Lyndon's review when we had to convert E* to delta G.
by Madison Hurst
Tue Feb 26, 2019 11:03 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Vant Hoff Equation
Replies: 3
Views: 70

Re: Vant Hoff Equation

It depends on what you are given but most of the time if you are trying to find K but you're given delta H and delta S (or vice versa)
by Madison Hurst
Tue Feb 26, 2019 1:18 am
Forum: Balancing Redox Reactions
Topic: Standard Potential
Replies: 2
Views: 43

Standard Potential

if the coefficients are proportional but different in the same 2 reactions, do you need to multiply E by the molar proportion or does it stay the same?
by Madison Hurst
Tue Feb 26, 2019 1:00 am
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 6753

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

In the Gibbs WS #4 how do you find T? or can you just assume its at 25 C?
by Madison Hurst
Tue Feb 26, 2019 12:45 am
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 6753

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

On #1 of the Gibbs to find the standard enthalpy and entropy of formation you have to do the sum of products minus the sum of the reactants using the numbers given right? For some reason I am not getting the same answer.
by Madison Hurst
Mon Feb 04, 2019 12:59 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Thermos
Replies: 4
Views: 70

Thermos

Why is a thermos considered an isolated system and not a closed system?
by Madison Hurst
Mon Feb 04, 2019 12:58 am
Forum: Calculating Work of Expansion
Topic: Integral calculations
Replies: 4
Views: 79

Integral calculations

When do you know to take the integral when finding work?
by Madison Hurst
Mon Feb 04, 2019 12:57 am
Forum: Phase Changes & Related Calculations
Topic: Heat and Condensation
Replies: 9
Views: 112

Heat and Condensation

Is heat absorbed or released during condensation?
by Madison Hurst
Mon Feb 04, 2019 12:57 am
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: isothermal expansion
Replies: 2
Views: 79

isothermal expansion

What is isothermal expansion?
by Madison Hurst
Mon Feb 04, 2019 12:56 am
Forum: Phase Changes & Related Calculations
Topic: Reversible changes
Replies: 1
Views: 48

Reversible changes

What changes to a system are reversible and which are irreversible?
by Madison Hurst
Mon Feb 04, 2019 12:53 am
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Isothermic definition
Replies: 5
Views: 109

Isothermic definition

What is the difference between isothermal and isometric?
by Madison Hurst
Fri Jan 11, 2019 4:14 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Inert Gases
Replies: 2
Views: 53

Inert Gases

Why does adding inert gases only affect the equilibrium constant in a closed system?
by Madison Hurst
Fri Jan 11, 2019 4:11 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Adding a liquid
Replies: 7
Views: 98

Re: Adding a liquid

I believe the only variable that affects K is temperature.
by Madison Hurst
Fri Jan 11, 2019 4:07 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Solids and Liquids in Rxn
Replies: 6
Views: 109

Solids and Liquids in Rxn

What would K be if the reaction was only made up of solids and liquids, no gases or aq solutions?
by Madison Hurst
Sat Dec 08, 2018 12:32 am
Forum: Calculating the pH of Salt Solutions
Topic: Atoms that don't affect pH
Replies: 3
Views: 172

Atoms that don't affect pH

How do you know which atoms affect the pH of a solution and which ones do not? For example in NH4Br how do you know not to include Br in the chemical equation?
by Madison Hurst
Fri Dec 07, 2018 9:14 pm
Forum: Amphoteric Compounds
Topic: Amphoteric compounds
Replies: 2
Views: 72

Amphoteric compounds

How do you know if a compound can be amphoteric?
by Madison Hurst
Fri Dec 07, 2018 9:10 pm
Forum: Amphoteric Compounds
Topic: Amphoteric
Replies: 4
Views: 159

Amphoteric

Are amphoteric and amphoprotic opposite properties? if not, what is the relationship between the two?
by Madison Hurst
Mon Dec 03, 2018 12:59 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Hydronium
Replies: 4
Views: 89

Hydronium

Why is hydronium sometimes referred to as H3O+ and sometimes as H+? What is the difference?
by Madison Hurst
Mon Dec 03, 2018 12:42 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Electronegativity and delocalization
Replies: 1
Views: 43

Electronegativity and delocalization

If an atom has a high electronegativity does it have a strong delocalization power too? Or weak delocal power?
by Madison Hurst
Mon Dec 03, 2018 12:29 pm
Forum: Lewis Acids & Bases
Topic: Lewis v. Bronsted
Replies: 2
Views: 55

Lewis v. Bronsted

Whats the difference between Lewis acids and bases and bronsted acids and bases?
by Madison Hurst
Mon Dec 03, 2018 12:16 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Calculating pH
Replies: 3
Views: 52

Calculating pH

When calculating pH do you only ever use the H3O+ concentration or will you ever use OH-?
by Madison Hurst
Tue Nov 27, 2018 1:15 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: I3-
Replies: 1
Views: 49

I3-

Would I3 ^1- (Iodine) be polar or non polar? its linear with 3 lone pairs on the central atom but is there any net dipole?
by Madison Hurst
Mon Nov 26, 2018 11:08 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: Dipole Forces
Replies: 3
Views: 61

Dipole Forces

What is the difference between induced dipole and dipole? How do forces between them differ based on what combination you have?
by Madison Hurst
Sun Nov 25, 2018 2:09 pm
Forum: Hybridization
Topic: sp orbitals
Replies: 3
Views: 79

sp orbitals

what do the 2 and 3 mean in sp2, sp3, sp3d2 etc orbitals?
by Madison Hurst
Sun Nov 25, 2018 10:46 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Naming
Replies: 4
Views: 81

Naming

Several times in lecture Dr. Lavelle said the shape would be one thing if looking at lone pairs, however it would be named differently. How do we know when to name it correctly based on regions of e- density and when to just give the general shape that considers lone pairs?
by Madison Hurst
Sun Nov 25, 2018 10:41 am
Forum: Determining Molecular Shape (VSEPR)
Topic: pi and sigma bonds
Replies: 9
Views: 149

pi and sigma bonds

Which bond has more energy pi or sigma?
by Madison Hurst
Sat Nov 24, 2018 2:59 pm
Forum: Hybridization
Topic: Steps to figure out hybridization
Replies: 3
Views: 66

Steps to figure out hybridization

Do you have to figure the lewis dot and/or VSEPR model to get the right hybridization? What are the steps to figure out if something needs hybridization?
by Madison Hurst
Wed Nov 14, 2018 10:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape
Replies: 4
Views: 54

Molecular Shape

Why are molecules considered octahedral that only have 6 bonds?
by Madison Hurst
Wed Nov 14, 2018 10:31 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 3
Views: 31

Bond Angles

Why are some bond angles exactly 120 or 109.5 while others say they are slightly less than that?
by Madison Hurst
Sat Nov 10, 2018 7:19 pm
Forum: Bond Lengths & Energies
Topic: Bond Lengths
Replies: 5
Views: 245

Bond Lengths

If we are asked to predict bond lengths is it just finding the average based on numbers given to you? How could you determine bond lengths if you weren't given any additional information?
by Madison Hurst
Sat Nov 10, 2018 7:16 pm
Forum: Dipole Moments
Topic: Hydrogen Bonds
Replies: 20
Views: 252

Hydrogen Bonds

Relative to other types of bonds, how strong are hydrogen bonds?
by Madison Hurst
Sat Nov 10, 2018 7:10 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 3
Views: 80

Electronegativity

Whats the difference between electronegativity and ionization energy?
by Madison Hurst
Sat Nov 10, 2018 6:58 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability Trend
Replies: 6
Views: 315

Re: Polarizability Trend

Polarizability follows the same trend as atomic radius: increasing right to left and increasing down a group
by Madison Hurst
Sun Nov 04, 2018 10:02 pm
Forum: Lewis Structures
Topic: Expanded Octet Rule
Replies: 4
Views: 78

Expanded Octet Rule

When a structure includes atoms with expanded octets what the max number of electrons that can be held? Is it 10 because of the d orbital or can it be more?
by Madison Hurst
Sun Nov 04, 2018 10:00 pm
Forum: Lewis Structures
Topic: Expanded Octet Rule
Replies: 1
Views: 26

Expanded Octet Rule

When a structure includes atoms with expanded octets what the max number of electrons that can be held? Is it 10 because of the d orbital or can it be more?
by Madison Hurst
Sun Nov 04, 2018 9:57 pm
Forum: Lewis Structures
Topic: Resonance structures
Replies: 2
Views: 52

Resonance structures

When a test question asks for resonance structures should we show all possible ones or only the most logical ones?
by Madison Hurst
Sun Nov 04, 2018 9:53 pm
Forum: Lewis Structures
Topic: Garlic Bread 12a
Replies: 5
Views: 117

Garlic Bread 12a

How do you determine the number of bonds you should use between Carbon and nitrogen/carbon and carbon/oxygen? Also is there a method to determining where the hydrogens should be placed or can you just do whatever works for the total number of valence e-?
by Madison Hurst
Sun Oct 21, 2018 9:28 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Particle Size
Replies: 3
Views: 78

Particle Size

As explained in the lecture we can know the momentum and position of a large object such as a baseball going through the detectors but not an electron because it is so small that the detectors interfere with its path. My question is do particles larger than electrons react in the same way? or would ...
by Madison Hurst
Sun Oct 21, 2018 9:17 pm
Forum: Properties of Electrons
Topic: Energy Levels and Electrons
Replies: 1
Views: 70

Energy Levels and Electrons

When an electron is excited to an n=2 or n=3 etc. state how long does it take to return to the threshold level where it emits a photon?
by Madison Hurst
Sun Oct 21, 2018 9:14 pm
Forum: Properties of Electrons
Topic: Wave Properties
Replies: 4
Views: 97

Wave Properties

Can other particles (non electrons) have wave-like properties too?
by Madison Hurst
Sun Oct 07, 2018 10:03 pm
Forum: Molarity, Solutions, Dilutions
Topic: Actual/Theoretical Yield
Replies: 8
Views: 742

Actual/Theoretical Yield

Should we know why actual yield is lower than theoretical yield in the way specific to the problem or just know the general reasons that actual yield is less than theoretical yield?
by Madison Hurst
Sun Oct 07, 2018 9:56 pm
Forum: Empirical & Molecular Formulas
Topic: Limiting Reactants
Replies: 3
Views: 219

Limiting Reactants

When finding limiting reagents, how do you know what product to compare moles to if not directly stated in the problem? I noticed several module problems that said what is the limiting reactant for the product created? However, there was more than one product in the reaction.
by Madison Hurst
Sun Oct 07, 2018 9:50 pm
Forum: Empirical & Molecular Formulas
Topic: Converting Units
Replies: 5
Views: 98

Converting Units

When multiple units are defined in a reaction, is it best to convert to equal units before writing out a reaction? Or will it still be a valid answer if units are converted at the end?

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