## Search found 60 matches

Sun Mar 10, 2019 2:09 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: reaction intermediates
Replies: 2
Views: 124

### reaction intermediates

How do you determine the reaction intermediates? What do they represent?
Sun Mar 10, 2019 2:01 pm
Forum: First Order Reactions
Topic: Half Life for First Order
Replies: 3
Views: 184

### Half Life for First Order

When determining the half-life of a first order reaction, why is it that ln2 is in the numerator of the equation? How did we get that?
Sun Mar 10, 2019 2:00 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Reaction Mechanisms
Replies: 1
Views: 76

### Reaction Mechanisms

How do you know which step is the slower of the two when determining the rate of the over all reaction?
Sun Mar 03, 2019 1:54 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Determining n and the order
Replies: 2
Views: 135

### Determining n and the order

What exactly is the order of the reaction and how do you find it?
Sun Mar 03, 2019 1:51 pm
Forum: General Rate Laws
Topic: Units of K
Replies: 4
Views: 236

### Units of K

What are the units of K in a zero order, first order, and second order reaction
Sun Mar 03, 2019 1:48 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Nernst Equation
Replies: 4
Views: 173

### Nernst Equation

When using the Nernst Equation, how can you find E if you are not given the three other variables and you have to solve for Ecell?
Thu Feb 21, 2019 12:44 pm
Forum: Balancing Redox Reactions
Topic: Finding Charge
Replies: 3
Views: 176

### Finding Charge

How exactly do you find the charge of a reactant if the charge is not given?
Thu Feb 21, 2019 12:43 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Calculating Gibbs
Replies: 2
Views: 127

### Calculating Gibbs

When using the equation deltaG=-nFE, how exactly do you determine n?
Thu Feb 21, 2019 12:42 pm
Forum: Balancing Redox Reactions
Topic: Half Reactions
Replies: 1
Views: 119

### Half Reactions

How would balancing redox half reactions differ from a basic and acidic solution?
Mon Feb 11, 2019 11:12 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Cp and Cv
Replies: 3
Views: 124

### Cp and Cv

When do you know to use Cp=5/2R and Cv=3/2 R for enthalpy calculations and entropy calculations?
Mon Feb 11, 2019 11:12 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Third Law
Replies: 2
Views: 150

### Third Law

Could someone explain the Third Law of Thermodynamics? I'm getting confused by the textbook definition and Lavelle's :)
Mon Feb 11, 2019 11:10 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Extensive vs Intensive
Replies: 7
Views: 519

### Extensive vs Intensive

What is the difference between an extensive and intensive property?
Tue Feb 05, 2019 9:51 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Bond Enthalpies
Replies: 2
Views: 143

### Bond Enthalpies

Why is it that the bonds formed will always have a negative sign? Is it because they are releasing heat after the bond is formed?
Tue Feb 05, 2019 9:49 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Specific Heat Capacity vs Heat Capacity
Replies: 1
Views: 119

### Specific Heat Capacity vs Heat Capacity

How do you know when to use specific heat capacity and just generalized heat capacity when solving for q?
Tue Feb 05, 2019 9:48 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 6
Views: 304

### Midterm

Does anyone know as to what section in the Sixth Edition Dr. Lavelle is going up to for the midterm? Are we staying in Outline 3 or are we moving into outline 4? Thanks!
Thu Jan 31, 2019 8:28 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Finding Heat
Replies: 4
Views: 228

### Finding Heat

When determining heat, do you always have to convert to K for q=mCT, or can you use celsius?
Thu Jan 31, 2019 8:24 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies
Replies: 2
Views: 121

### Bond Enthalpies

If you're looking at a carbon ring, which bond enthalpy would you use considering that there is a mix of double and single bonds between the carbons
Thu Jan 31, 2019 8:23 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Closed System
Replies: 6
Views: 305

### Closed System

How does a sealed beaker represent a closed system? wouldn't it be isolated because it can't exchange matter and energy with its surroundings?
Sun Jan 27, 2019 11:58 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Enthalpy of Formation
Replies: 2
Views: 128

### Standard Enthalpy of Formation

How do you find the standard enthalpy of formation? Is it based off the heat of reaction?
Sun Jan 27, 2019 11:48 am
Forum: Phase Changes & Related Calculations
Topic: Phase Changes
Replies: 7
Views: 402

### Phase Changes

Why is melting and vaporization considered endothermic?
Sun Jan 27, 2019 11:46 am
Forum: Phase Changes & Related Calculations
Topic: State Properties
Replies: 3
Views: 213

### State Properties

How do work and heat depend on the path taken? How do you determine work?
Mon Jan 21, 2019 3:11 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Salt
Replies: 4
Views: 207

### Salt

How can you determine if the reaction is with a salt? How is determining the equillibrium constant different from an acid/base?
Mon Jan 21, 2019 3:08 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Acid Strength
Replies: 3
Views: 146

### Acid Strength

How can you determine the strength of an acid through the ka and pka?
Mon Jan 21, 2019 3:07 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's Principle on Temperature
Replies: 4
Views: 248

### Le Chatelier's Principle on Temperature

Which is favored when the heat is lowered in a reaction? Would it move towards the exothermic reaction?
Sun Jan 13, 2019 8:36 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Determining Which side is favored
Replies: 5
Views: 257

### Determining Which side is favored

Why is it that when Q<K, the forward reaction is favored? Is it because there are more reactants that will be turned into products as the reaction continues?
Sun Jan 13, 2019 8:34 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Catalysts [ENDORSED]
Replies: 3
Views: 144

### Catalysts[ENDORSED]

Does adding a catalyst change the equillibrium of a reaction?
Sun Jan 13, 2019 8:32 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Le Chatelier's Principle
Replies: 3
Views: 189

### Le Chatelier's Principle

Why does looking at the difference of moles to determine which side is favored work for the change in pressure? Do the rules also apply to the change in volume as well?
Thu Jan 10, 2019 3:43 pm
Forum: Ideal Gases
Topic: Equilibrium Favoring
Replies: 4
Views: 98

### Equilibrium Favoring

Why are equilibrium constants that are greater than 10^3 favor the products?
Thu Jan 10, 2019 3:40 pm
Forum: Ideal Gases
Topic: Equilibrium Constant
Replies: 3
Views: 161

### Equilibrium Constant

Why are solids and liquids not used in calculating the equilibrium constant? Do you only use the concentration when the reactants and products are aqueous, or can you also use it when it is a gas
Thu Jan 10, 2019 3:39 pm
Forum: Ideal Gases
Topic: Equilibrium Constant and Reaction Quotient
Replies: 3
Views: 285

### Equilibrium Constant and Reaction Quotient

What exactly is the difference between the reaction quotient and the equilibrium constant? Are they calculated the same way?
Sun Dec 02, 2018 2:54 pm
Forum: Naming
Topic: Chelate vs Polydentate
Replies: 1
Views: 142

### Chelate vs Polydentate

What is the difference between a chelate and a polydentate? How do you determine these from the coordination name?
Sun Dec 02, 2018 2:51 pm
Forum: Lewis Acids & Bases
Topic: Weak and Strong Acids/Bases
Replies: 7
Views: 400

### Weak and Strong Acids/Bases

How do you determine if an acid or base is strong or weak? Is it based off the lewis structure? or the reaction equation?
Sun Dec 02, 2018 2:47 pm
Forum: Naming
Topic: Coordination Sphere
Replies: 2
Views: 137

### Coordination Sphere

What is the coordination sphere and how do you know that the compound will form a sphere from the coordination name?
Mon Nov 26, 2018 5:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Octahedral
Replies: 3
Views: 349

### Octahedral

What are the bond angles for an octahedral? Does it decrease when two bonded pairs are replaced with lone pairs, and the shape becomes square planar, or do the lone pair repulsions cancel out because they are directly across each other?
Mon Nov 26, 2018 5:08 pm
Forum: Resonance Structures
Topic: Intermolecular Forces
Replies: 1
Views: 277

### Intermolecular Forces

What is the key difference between a dipole-dipole force and a dipole-induced dipole?
Mon Nov 26, 2018 5:05 pm
Forum: Naming
Topic: Ligand
Replies: 4
Views: 253

### Ligand

What exactly is a ligand, and how is it used in bonding? What specific properties does it have?
Mon Nov 19, 2018 9:43 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability and Ionic Character
Replies: 2
Views: 312

### Polarizability and Ionic Character

How can you use the polarizing power to find which element has more ionic character? What are the general guidelines?
Mon Nov 19, 2018 9:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSPER Formula
Replies: 7
Views: 485

### VSPER Formula

What does the A stand for in the VSPER Formula? What can you use the formula to find out?
Mon Nov 19, 2018 9:40 pm
Forum: Dipole Moments
Topic: Dipole-Dipole Forces
Replies: 2
Views: 142

### Dipole-Dipole Forces

How can you determine if there are dipole-dipole interactions without electronegativities?
Sat Nov 10, 2018 4:25 pm
Forum: Lewis Structures
Topic: Molecule Shape
Replies: 8
Views: 419

### Molecule Shape

How can you tell the shape of the molecule from the Lewis Structure?
Sat Nov 10, 2018 4:18 pm
Forum: Dipole Moments
Topic: VSPER
Replies: 8
Views: 404

### VSPER

What is VSPER? What do you use it for?
Sat Nov 10, 2018 4:16 pm
Forum: Dipole Moments
Topic: Dipole Moments
Replies: 4
Views: 131

### Dipole Moments

Hi!
I was wondering how you can tell which atom has which dipole moment, and how a dipole moment works.
Mon Nov 05, 2018 1:24 pm
Forum: Lewis Structures
Topic: Lewis Structures for Ionic Bonds
Replies: 5
Views: 222

### Lewis Structures for Ionic Bonds

What's the difference when drawing a lewis structure for an ionic and covalent bond?
Mon Nov 05, 2018 12:58 pm
Forum: Resonance Structures
Replies: 11
Views: 880

What is a radical and how do you draw the Lewis structure for it?
Mon Nov 05, 2018 12:54 pm
Forum: Ionic & Covalent Bonds
Topic: Definition of a Covalent Bond
Replies: 4
Views: 227

### Definition of a Covalent Bond

What is the difference between a covalent bond and a coordinate covalent bond?
Wed Oct 31, 2018 7:49 pm
Forum: Ionic & Covalent Bonds
Topic: Multi-Electron Atom
Replies: 3
Views: 214

### Multi-Electron Atom

What is a multi-electron atom, and how do they tie into q1q2/r?
Wed Oct 31, 2018 7:44 pm
Forum: Ionic & Covalent Bonds
Topic: Removing the second electron
Replies: 8
Views: 334

### Removing the second electron

Why is removing the second electron harder? Does it have to do with the pull from the nucleus on the electron?
Wed Oct 31, 2018 7:42 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 3.5a on 6th Edition
Replies: 1
Views: 103

### 3.5a on 6th Edition

Hey y'all!

I was wondering as to why 3.5a Cu+ is [Ar]3d^10. Doesn't the + mean that the atom is losing electrons?
Wed Oct 24, 2018 7:41 pm
Forum: Quantum Numbers and The H-Atom
Topic: 2 Exceptions to the Electron Configuration
Replies: 3
Views: 127

### 2 Exceptions to the Electron Configuration

Why does Cr and Cu have the exception applied to them?
Wed Oct 24, 2018 7:39 pm
Forum: Quantum Numbers and The H-Atom
Topic: Electron Configuration Order
Replies: 2
Views: 71

### Electron Configuration Order

Why exactly does the 4s orbital come before the 3d orbital? Does it have to do with the core electrons?
Wed Oct 24, 2018 7:37 pm
Forum: Quantum Numbers and The H-Atom
Topic: Electron Spin
Replies: 3
Views: 124

### Electron Spin

How do you determine the electron spin? Is it based off the Aufbau Diagram?
Wed Oct 17, 2018 9:23 pm
Forum: *Particle in a Box
Topic: Work Function
Replies: 3
Views: 481

### Work Function

What is exactly the work function, and how does it play into finding the energy of an atom?
Wed Oct 17, 2018 9:21 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbital Shape
Replies: 1
Views: 65

### Orbital Shape

I was confused in today's lecture because when we were introduced to let's say, the five orbitals of the d-orbital. Do all of those variations of orbital shape occur at once, because they are each an orbital, or does it mean there is five possibilities of different orbitals? Sorry if the wording is ...
Wed Oct 17, 2018 9:19 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Lyman vs Balmer
Replies: 6
Views: 414

### Lyman vs Balmer

I was wondering what is the key difference between the Lyman and Balmer series. Also, in what situations would you use them?
Sun Oct 07, 2018 5:06 pm
Forum: Quantum Numbers and The H-Atom
Topic: Number of Orbitals
Replies: 3
Views: 268

### Number of Orbitals

I was wondering how you can find the number of orbitals and electrons based on the subshell notation. I'm a lil rusty on this section, so any help would greatly appreciated!
Sun Oct 07, 2018 5:03 pm
Forum: Quantum Numbers and The H-Atom
Topic: Help on 2.23
Replies: 1
Views: 107

### Help on 2.23

Hi! I'm confused on what exactly the magnetic quantum number is and how it is used to find the number of orbitals
Sat Oct 06, 2018 2:55 pm
Forum: DeBroglie Equation
Topic: de Broglie Relationship
Replies: 3
Views: 182

### de Broglie Relationship

Looking at question 1.33 in the sixth edition, I was wondering how we know what mass to use. I understand that in h/mv, h is given and v is given as well, but what information do you use to know what m is?
Wed Oct 03, 2018 5:05 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Molecule vs Formula Unit
Replies: 4
Views: 363

### Molecule vs Formula Unit

On problem E21 in the 6th Edition, the ask us to find the "number of molecules and formula units." Does that mean that these terms are interchangeable? If not, what is the main difference between the two?
Wed Oct 03, 2018 5:01 pm
Forum: Limiting Reactant Calculations
Topic: Finding the Limiting Reactant
Replies: 2
Views: 168

### Finding the Limiting Reactant

If there is no excess in product, which means there is no limiting reactant, which reactant would you use to find the mass of the product? Are they interchangable because they have the same amount of mols? What if the mol to mol ratio is different?
Wed Oct 03, 2018 4:55 pm
Forum: Balancing Chemical Reactions
Topic: Molecules present after Dilution
Replies: 2
Views: 185

### Molecules present after Dilution

Hi everyone! My question is G25 in the sixth edition textbook, which asks how many molecules will be present in a 10. mL solution after diluting the solution with a .10M with 10mL of that solution 90 times. From my understanding, you can find the mols in the solution by doing M=n/C, and multiplying ...