Search found 60 matches
- Sun Mar 10, 2019 2:09 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: reaction intermediates
- Replies: 2
- Views: 289
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: 432
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: 201
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: 334
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: 501
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: 418
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: 399
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: 324
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: 256
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: 337
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: 339
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: 1272
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: 313
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: 217
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: 657
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: 413
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: 267
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: 677
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: 261
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: 923
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: 412
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: 441
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: 319
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: 509
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: 703
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: 313
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: 401
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: 210
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: 286
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: 548
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: 338
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: 782
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: 253
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: 1696
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: 387
Intermolecular Forces
What is the key difference between a dipole-dipole force and a dipole-induced dipole?
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: 1172
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: 826
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: 331
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: 774
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: 970
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: 375
Dipole Moments
Hi!
I was wondering how you can tell which atom has which dipole moment, and how a dipole moment works.
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: 516
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
- Topic: Radicals
- Replies: 11
- Views: 1415
Radicals
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: 498
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: 429
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: 690
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: 232
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?
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: 249
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: 134
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: 263
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: 710
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: 112
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: 820
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: 414
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: 154
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: 258
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: 833
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: 294
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: 364
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 ...