Search found 60 matches
- Thu Mar 14, 2019 11:13 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: catalyst vs intermediate
- Replies: 2
- Views: 327
catalyst vs intermediate
What is the difference between a catalyst and an intermediate component?
- Thu Mar 14, 2019 11:11 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: frequency factor
- Replies: 2
- Views: 320
frequency factor
For A, the frequency factor, what is meant by "correct" orientation when reactants collide versus just any given orientation? How do you know if the positioning is correct or not?
- Mon Mar 11, 2019 11:40 pm
- Forum: Zero Order Reactions
- Topic: zero order in rate law
- Replies: 7
- Views: 1264
zero order in rate law
If a reactant is a zero order reactant, is it included when writing out the overall rate law for the entire reaction?
- Sun Mar 10, 2019 11:04 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: molecularity
- Replies: 4
- Views: 761
molecularity
Is the molecularity related to the amount of reactants in a reaction? Is it related to the order of the reaction?
- Sun Mar 10, 2019 11:02 pm
- Forum: First Order Reactions
- Topic: pseudo vs 2nd order
- Replies: 4
- Views: 651
pseudo vs 2nd order
When is it appropriate to use the pseudo 1st order for a reaction?
- Sun Mar 10, 2019 10:58 pm
- Forum: First Order Reactions
- Topic: reaction orders
- Replies: 3
- Views: 374
reaction orders
Does the order of a reactant have to always be a positive, whole number?
- Thu Feb 28, 2019 3:40 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: writing electrodes into cell diagrams
- Replies: 1
- Views: 170
writing electrodes into cell diagrams
How do you know when you will need to add an inert electrode, such as platinum, in the cell diagram when it is not mentioned in the reaction?
- Thu Feb 28, 2019 2:51 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 14.9b
- Replies: 1
- Views: 220
14.9b
For this problem, why does the n=6??
- Wed Feb 27, 2019 6:45 pm
- Forum: Balancing Redox Reactions
- Topic: 14.1d [ENDORSED]
- Replies: 1
- Views: 208
14.1d [ENDORSED]
For this problem, why is there a coefficient of 3 in front of (Cr2O7)2- and (C2H40)?
- Sun Feb 24, 2019 10:20 am
- Forum: Van't Hoff Equation
- Topic: Van't Hoff equation
- Replies: 2
- Views: 532
Van't Hoff equation
In what cases are we supposed to use the Van't Hoff equation ever deltaG=deltaH - TdeltaS?
- Sun Feb 24, 2019 10:17 am
- Forum: Balancing Redox Reactions
- Topic: conducting solids in rxns
- Replies: 1
- Views: 191
conducting solids in rxns
Are all solid metals conductors or are platinum and graphite the only conductors we should know?
- Sun Feb 24, 2019 10:15 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: cell potential vs emf
- Replies: 2
- Views: 267
cell potential vs emf
Is there a relationship between cell potential and electromotive force? Lavelle used E to represent both so I don't know what the differences are between them
- Wed Feb 13, 2019 11:46 am
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Residual vs positional entropy
- Replies: 2
- Views: 451
Residual vs positional entropy
Can someone explain the difference between residual and positional entropy?
- Wed Feb 13, 2019 11:45 am
- 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: Thermodynamic Laws
- Replies: 1
- Views: 440
Thermodynamic Laws
For the midterm will we be expected to explain the laws conceptually or just through equations?
- Wed Feb 13, 2019 11:44 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: using gas constant R
- Replies: 4
- Views: 533
using gas constant R
For which equations will we use just R versus using 5/2R and 3/2R for an ideal gas?
- Sat Feb 09, 2019 3:34 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: 9.25 6th edition
- Replies: 1
- Views: 201
9.25 6th edition
Can someone explain please explain how they worked through this problem. Thanks!
- Sat Feb 09, 2019 3:11 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: 9.19 6th edition
- Replies: 1
- Views: 268
9.19 6th edition
I thought the number of moles was needed to calculate the standard entropy of vaporization. What do we use if no mass is given the question?
- Sat Feb 09, 2019 3:05 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: 9.15b 6th edition
- Replies: 1
- Views: 216
9.15b 6th edition
For this problem, you use the q=n(delta H) right?
- Sun Feb 03, 2019 11:37 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: 8.113a 6th edition
- Replies: 2
- Views: 295
8.113a 6th edition
Why are the reaction enthalpies for only CO and H20 used?
- Sun Feb 03, 2019 11:08 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: 103 6th edition
- Replies: 2
- Views: 276
103 6th edition
How is Kinetic Energy calculated in this problem?
- Sun Feb 03, 2019 9:57 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: 8.101b 6th edition
- Replies: 1
- Views: 150
8.101b 6th edition
For this problem why is SO2 the limiting reactant if there are equal amounts of reactants and SO2 has a greater coefficient, why would it be the limiting reactant?
- Mon Jan 21, 2019 10:35 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: listing strength of acids by their pKa/pKb values
- Replies: 2
- Views: 603
listing strength of acids by their pKa/pKb values
How do you rank a list of acids when given their pKa or pKb values?
- Mon Jan 21, 2019 10:22 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 12.39
- Replies: 2
- Views: 312
12.39
The tables used for this problem don't have the exact acids/bases requested in the problem... do you convert the values?
- Mon Jan 21, 2019 10:10 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: autoprotolysis
- Replies: 2
- Views: 183
autoprotolysis
Hey can someone explain what autoprotolysis is? When is it used in acid and base reactions? Thanks!
- Fri Jan 18, 2019 10:00 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 12.25 7th edition
- Replies: 1
- Views: 170
12.25 7th edition
For this problem how do you calculate the molarity of H30+ ?
- Thu Jan 17, 2019 8:04 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 11.21 7th edition
- Replies: 1
- Views: 178
11.21 7th edition
For this problem how do you calculate molarity from pOH? Is it even necessary to find the pOH?
- Tue Jan 15, 2019 9:59 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 11.59
- Replies: 3
- Views: 343
11.59
After using the quadratic to solve for x, how do we know which outcome is valid if both numbers are positive?
- Sun Jan 13, 2019 12:11 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 11.33
- Replies: 1
- Views: 119
11.33
I keep getting a different answer for 33a in the 6th edition, can someone explain how they solved this one out? Thanks!
- Sun Jan 13, 2019 11:49 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: converting from pressure to concentration
- Replies: 4
- Views: 442
converting from pressure to concentration
When using the formula PV=nRT t convert between partial pressure and concentration, what is used for R? Is it a constant or should it be given in the problem?
- Tue Jan 08, 2019 7:29 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: 11.1d
- Replies: 2
- Views: 270
11.1d
Hey can someone explain this problem? Thanks!
- Thu Dec 06, 2018 11:51 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: identify base/acid from lewis structure
- Replies: 2
- Views: 285
identify base/acid from lewis structure
I'm still confused on how to determine if a molecule is an acid or base from the lewis structures...can someone explain?
- Thu Dec 06, 2018 11:49 pm
- Forum: Conjugate Acids & Bases
- Topic: proton transfer equilibrium?
- Replies: 1
- Views: 394
proton transfer equilibrium?
In hw problem 119, what is meant by the proton transfer equilibrium?
- Thu Dec 06, 2018 11:47 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: pH for strong acids [ENDORSED]
- Replies: 2
- Views: 287
pH for strong acids [ENDORSED]
Is it implied that a strong acid will have the same pH at H3O+ because the molecule completely dissociates?
- Thu Nov 29, 2018 11:45 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Chelate
- Replies: 2
- Views: 244
Chelate
What exactly is a chelate? Does this strengthen or weaken the bonding of the complex?
Naming
When is the prefix aqua- used?
- Thu Nov 29, 2018 11:36 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: HW problem 33 6th edition
- Replies: 1
- Views: 146
HW problem 33 6th edition
Can someone explain #33? Also, does polydentate just mean that the central atom is bonded to more than one other atom? Thanks!
- Sun Nov 25, 2018 1:58 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Hypervalent Compounds
- Replies: 1
- Views: 251
Hypervalent Compounds
Are all compounds containing a period 3 or below element considered hypervalent compounds as a result of the d-orbital?
- Sun Nov 25, 2018 1:55 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Molecular Orbital Theory
- Replies: 1
- Views: 196
Molecular Orbital Theory
The text explains that according to MO theory, electrons are delocalized over entire molecule, is this true for molecules that don't have resonance as well? If so, what is the difference?
- Sun Nov 25, 2018 1:53 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: bonding vs anti bonding orbitals
- Replies: 2
- Views: 347
bonding vs anti bonding orbitals
Hi, can someone clarify the concept of bonding orbitals and anti bonding orbitals please? Thanks!
- Sun Nov 18, 2018 3:50 pm
- Forum: Hybridization
- Topic: hybridization vs VSEPR notation
- Replies: 3
- Views: 359
hybridization vs VSEPR notation
Hi! I'm getting confused about the difference between VSEPR notation and hybridization formulas. Is there a relationship between the structure or are they completely independent? Thanks
- Sun Nov 18, 2018 3:45 pm
- Forum: Hybridization
- Topic: Hybridization
- Replies: 2
- Views: 300
Re: Hybridization
Hi! I'm also confused about the concept of hybridization, if anyone could explain that would be awesome, thanks!
- Sun Nov 18, 2018 3:43 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: atom orientation
- Replies: 1
- Views: 113
atom orientation
How does the amount of repulsion between atoms correlate to the atoms being placed in 1 plane or multiple planes around the central atom?
- Sat Nov 10, 2018 10:50 pm
- Forum: Bond Lengths & Energies
- Topic: VSEPR Model
- Replies: 1
- Views: 192
VSEPR Model
Can someone clarify the VSEPR model and explain how the repulsion strength of lone-lone pair is greater than the bonded-bonded pair? Thanks!
- Sat Nov 10, 2018 10:44 pm
- Forum: Ionic & Covalent Bonds
- Topic: Covalent vs Hydrogen bond in H20
- Replies: 4
- Views: 1762
Covalent vs Hydrogen bond in H20
Are the bonds holding the hydrogen atoms to the oxygen atoms in a water molecule also hydrogen bonds, or covalent bonds?
- Sat Nov 10, 2018 10:43 pm
- Forum: Dipole Moments
- Topic: Polarity and Dipole moments
- Replies: 2
- Views: 333
Polarity and Dipole moments
So if a molecule has a dipole moment it will then have a net charge and therefore be polar? Or does polarity and dipole moments have no direct relationship?
- Sat Nov 03, 2018 2:10 pm
- Forum: Electronegativity
- Topic: Electronegativity
- Replies: 4
- Views: 426
Electronegativity
When calculating electronegativity difference, will the values be given or do we have to know how to solve for the measurement?
- Sat Nov 03, 2018 2:03 pm
- Forum: Bond Lengths & Energies
- Topic: Coordinate covalent bonds
- Replies: 1
- Views: 210
Coordinate covalent bonds
I know he mentioned it in lecture, but can someone explain what a coordinate covalent bond is and how it works please? Thanks!
- Sat Nov 03, 2018 2:01 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Lengths
- Replies: 3
- Views: 401
Bond Lengths
Will we have to know how to calculate bond lengths or know the trend for bond lengths for the midterm?
- Sat Oct 27, 2018 6:08 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: hw problem 3.51 6th edition
- Replies: 2
- Views: 233
hw problem 3.51 6th edition
What is meant by formal charge? How do you identify formal charge over just charge?
- Sat Oct 27, 2018 6:00 pm
- Forum: Ionic & Covalent Bonds
- Topic: ionization energy [ENDORSED]
- Replies: 4
- Views: 241
ionization energy [ENDORSED]
Can someone please explain why removing a second electron is more difficult and why the second ionization energy of an element is always higher? Thanks!!
- Sat Oct 27, 2018 5:54 pm
- Forum: Resonance Structures
- Topic: Hw problem 3.43 6th edition
- Replies: 1
- Views: 263
Hw problem 3.43 6th edition
In the questions it is stated that resonance structures are possible when satisfying the octet rule. What does this mean and how does it apply to the context of the problem?
- Thu Oct 18, 2018 10:17 pm
- Forum: Photoelectric Effect
- Topic: Work Function
- Replies: 16
- Views: 858
Re: Work Function
For problem 1.69b do you have to convert electron volts to joules, and then use the E=hc/frequency equation?
- Thu Oct 18, 2018 9:42 pm
- Forum: DeBroglie Equation
- Topic: 1.59 6th edition
- Replies: 1
- Views: 133
1.59 6th edition
Problem 1.59 reads: "Each second a certain lamp produces 9.8 x 10^20 photons with a wavelength of 434 nm. How much energy (in joules) is produced as radiation at this wavelength?". Where the does the number of photons fit into an equation?
- Thu Oct 18, 2018 9:15 pm
- Forum: DeBroglie Equation
- Topic: problem 43 6th edition
- Replies: 4
- Views: 436
problem 43 6th edition
For problem 43 in the 6th edition book, what is meant by "minimum uncertainty"? How do you solve for it?
- Fri Oct 12, 2018 6:56 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: #15 hw
- Replies: 1
- Views: 139
#15 hw
Hey for homework problem #15, 6th edition, can someone explain how to solve for n?
- Fri Oct 12, 2018 6:42 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Balmer/Lyman... Series
- Replies: 4
- Views: 370
Re: Balmer/Lyman... Series
What exactly do these series represent in terms of energy?
- Fri Oct 12, 2018 6:39 pm
- Forum: Properties of Light
- Topic: Exponents
- Replies: 1
- Views: 162
Exponents
For problem 9 I am getting the right numbers with the wrong powers of ten. Any quick tips for how to convert between these more easily?
- Sat Oct 06, 2018 7:18 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: hw problem F17
- Replies: 1
- Views: 94
hw problem F17
For homework problem F17 6th edition, what is meant by "mass spectrum"?
- Sat Oct 06, 2018 7:10 pm
- Forum: Empirical & Molecular Formulas
- Topic: homework problem F9
- Replies: 3
- Views: 281
homework problem F9
For problem F9 6th edition, do you divide the percentages by the molar mass of their respective elements, or by the molar mass of the entire compound?
- Sat Oct 06, 2018 7:05 pm
- Forum: Empirical & Molecular Formulas
- Topic: homework problem E23
- Replies: 2
- Views: 339
homework problem E23
For problem E23c) 6th edition, the problem asks to calculate the unknown amounts in moles and later asks to find the amount of F in ions. Which should we be looking for?