Search found 60 matches

by Vanessa Reyes_1K
Thu Mar 14, 2019 11:13 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: catalyst vs intermediate
Replies: 2
Views: 46

catalyst vs intermediate

What is the difference between a catalyst and an intermediate component?
by Vanessa Reyes_1K
Thu Mar 14, 2019 11:11 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: frequency factor
Replies: 2
Views: 45

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?
by Vanessa Reyes_1K
Mon Mar 11, 2019 11:40 pm
Forum: Zero Order Reactions
Topic: zero order in rate law
Replies: 7
Views: 146

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?
by Vanessa Reyes_1K
Sun Mar 10, 2019 11:04 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: molecularity
Replies: 4
Views: 117

molecularity

Is the molecularity related to the amount of reactants in a reaction? Is it related to the order of the reaction?
by Vanessa Reyes_1K
Sun Mar 10, 2019 11:02 pm
Forum: First Order Reactions
Topic: pseudo vs 2nd order
Replies: 4
Views: 68

pseudo vs 2nd order

When is it appropriate to use the pseudo 1st order for a reaction?
by Vanessa Reyes_1K
Sun Mar 10, 2019 10:58 pm
Forum: First Order Reactions
Topic: reaction orders
Replies: 3
Views: 37

reaction orders

Does the order of a reactant have to always be a positive, whole number?
by Vanessa Reyes_1K
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: 36

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?
by Vanessa Reyes_1K
Thu Feb 28, 2019 2:51 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 14.9b
Replies: 1
Views: 39

14.9b

For this problem, why does the n=6??
by Vanessa Reyes_1K
Wed Feb 27, 2019 6:45 pm
Forum: Balancing Redox Reactions
Topic: 14.1d [ENDORSED]
Replies: 1
Views: 41

14.1d [ENDORSED]

For this problem, why is there a coefficient of 3 in front of (Cr2O7)2- and (C2H40)?
by Vanessa Reyes_1K
Sun Feb 24, 2019 10:20 am
Forum: Van't Hoff Equation
Topic: Van't Hoff equation
Replies: 2
Views: 108

Van't Hoff equation

In what cases are we supposed to use the Van't Hoff equation ever deltaG=deltaH - TdeltaS?
by Vanessa Reyes_1K
Sun Feb 24, 2019 10:17 am
Forum: Balancing Redox Reactions
Topic: conducting solids in rxns
Replies: 1
Views: 28

conducting solids in rxns

Are all solid metals conductors or are platinum and graphite the only conductors we should know?
by Vanessa Reyes_1K
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: 49

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
by Vanessa Reyes_1K
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: 60

Residual vs positional entropy

Can someone explain the difference between residual and positional entropy?
by Vanessa Reyes_1K
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: 92

Thermodynamic Laws

For the midterm will we be expected to explain the laws conceptually or just through equations?
by Vanessa Reyes_1K
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: 80

using gas constant R

For which equations will we use just R versus using 5/2R and 3/2R for an ideal gas?
by Vanessa Reyes_1K
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: 36

9.25 6th edition

Can someone explain please explain how they worked through this problem. Thanks!
by Vanessa Reyes_1K
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: 50

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?
by Vanessa Reyes_1K
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: 43

9.15b 6th edition

For this problem, you use the q=n(delta H) right?
by Vanessa Reyes_1K
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: 44

8.113a 6th edition

Why are the reaction enthalpies for only CO and H20 used?
by Vanessa Reyes_1K
Sun Feb 03, 2019 11:08 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 103 6th edition
Replies: 2
Views: 49

103 6th edition

How is Kinetic Energy calculated in this problem?
by Vanessa Reyes_1K
Sun Feb 03, 2019 9:57 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 8.101b 6th edition
Replies: 1
Views: 36

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?
by Vanessa Reyes_1K
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: 62

listing strength of acids by their pKa/pKb values

How do you rank a list of acids when given their pKa or pKb values?
by Vanessa Reyes_1K
Mon Jan 21, 2019 10:22 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 12.39
Replies: 2
Views: 48

12.39

The tables used for this problem don't have the exact acids/bases requested in the problem... do you convert the values?
by Vanessa Reyes_1K
Mon Jan 21, 2019 10:10 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: autoprotolysis
Replies: 2
Views: 39

autoprotolysis

Hey can someone explain what autoprotolysis is? When is it used in acid and base reactions? Thanks!
by Vanessa Reyes_1K
Fri Jan 18, 2019 10:00 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 12.25 7th edition
Replies: 1
Views: 33

12.25 7th edition

For this problem how do you calculate the molarity of H30+ ?
by Vanessa Reyes_1K
Thu Jan 17, 2019 8:04 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 11.21 7th edition
Replies: 1
Views: 39

11.21 7th edition

For this problem how do you calculate molarity from pOH? Is it even necessary to find the pOH?
by Vanessa Reyes_1K
Tue Jan 15, 2019 9:59 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 11.59
Replies: 3
Views: 58

11.59

After using the quadratic to solve for x, how do we know which outcome is valid if both numbers are positive?
by Vanessa Reyes_1K
Sun Jan 13, 2019 12:11 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 11.33
Replies: 1
Views: 52

11.33

I keep getting a different answer for 33a in the 6th edition, can someone explain how they solved this one out? Thanks!
by Vanessa Reyes_1K
Sun Jan 13, 2019 11:49 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: converting from pressure to concentration
Replies: 4
Views: 81

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?
by Vanessa Reyes_1K
Tue Jan 08, 2019 7:29 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: 11.1d
Replies: 2
Views: 69

11.1d

Hey can someone explain this problem? Thanks!
by Vanessa Reyes_1K
Thu Dec 06, 2018 11:51 pm
Forum: Identifying Acidic & Basic Salts
Topic: identify base/acid from lewis structure
Replies: 2
Views: 76

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?
by Vanessa Reyes_1K
Thu Dec 06, 2018 11:49 pm
Forum: Conjugate Acids & Bases
Topic: proton transfer equilibrium?
Replies: 1
Views: 104

proton transfer equilibrium?

In hw problem 119, what is meant by the proton transfer equilibrium?
by Vanessa Reyes_1K
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: 64

pH for strong acids [ENDORSED]

Is it implied that a strong acid will have the same pH at H3O+ because the molecule completely dissociates?
by Vanessa Reyes_1K
Thu Nov 29, 2018 11:45 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelate
Replies: 2
Views: 73

Chelate

What exactly is a chelate? Does this strengthen or weaken the bonding of the complex?
by Vanessa Reyes_1K
Thu Nov 29, 2018 11:44 pm
Forum: Naming
Topic: Naming
Replies: 5
Views: 138

Naming

When is the prefix aqua- used?
by Vanessa Reyes_1K
Thu Nov 29, 2018 11:36 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: HW problem 33 6th edition
Replies: 1
Views: 42

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!
by Vanessa Reyes_1K
Sun Nov 25, 2018 1:58 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Hypervalent Compounds
Replies: 1
Views: 41

Hypervalent Compounds

Are all compounds containing a period 3 or below element considered hypervalent compounds as a result of the d-orbital?
by Vanessa Reyes_1K
Sun Nov 25, 2018 1:55 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Molecular Orbital Theory
Replies: 1
Views: 53

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?
by Vanessa Reyes_1K
Sun Nov 25, 2018 1:53 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: bonding vs anti bonding orbitals
Replies: 2
Views: 84

bonding vs anti bonding orbitals

Hi, can someone clarify the concept of bonding orbitals and anti bonding orbitals please? Thanks!
by Vanessa Reyes_1K
Sun Nov 18, 2018 3:50 pm
Forum: Hybridization
Topic: hybridization vs VSEPR notation
Replies: 3
Views: 113

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
by Vanessa Reyes_1K
Sun Nov 18, 2018 3:45 pm
Forum: Hybridization
Topic: Hybridization
Replies: 2
Views: 71

Re: Hybridization

Hi! I'm also confused about the concept of hybridization, if anyone could explain that would be awesome, thanks!
by Vanessa Reyes_1K
Sun Nov 18, 2018 3:43 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: atom orientation
Replies: 1
Views: 41

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?
by Vanessa Reyes_1K
Sat Nov 10, 2018 10:50 pm
Forum: Bond Lengths & Energies
Topic: VSEPR Model
Replies: 1
Views: 48

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!
by Vanessa Reyes_1K
Sat Nov 10, 2018 10:44 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent vs Hydrogen bond in H20
Replies: 4
Views: 79

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?
by Vanessa Reyes_1K
Sat Nov 10, 2018 10:43 pm
Forum: Dipole Moments
Topic: Polarity and Dipole moments
Replies: 2
Views: 76

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?
by Vanessa Reyes_1K
Sat Nov 03, 2018 2:10 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 4
Views: 88

Electronegativity

When calculating electronegativity difference, will the values be given or do we have to know how to solve for the measurement?
by Vanessa Reyes_1K
Sat Nov 03, 2018 2:03 pm
Forum: Bond Lengths & Energies
Topic: Coordinate covalent bonds
Replies: 1
Views: 41

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!
by Vanessa Reyes_1K
Sat Nov 03, 2018 2:01 pm
Forum: Bond Lengths & Energies
Topic: Bond Lengths
Replies: 3
Views: 86

Bond Lengths

Will we have to know how to calculate bond lengths or know the trend for bond lengths for the midterm?
by Vanessa Reyes_1K
Sat Oct 27, 2018 6:08 pm
Forum: Formal Charge and Oxidation Numbers
Topic: hw problem 3.51 6th edition
Replies: 2
Views: 93

hw problem 3.51 6th edition

What is meant by formal charge? How do you identify formal charge over just charge?
by Vanessa Reyes_1K
Sat Oct 27, 2018 6:00 pm
Forum: Ionic & Covalent Bonds
Topic: ionization energy [ENDORSED]
Replies: 4
Views: 58

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!!
by Vanessa Reyes_1K
Sat Oct 27, 2018 5:54 pm
Forum: Resonance Structures
Topic: Hw problem 3.43 6th edition
Replies: 1
Views: 100

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?
by Vanessa Reyes_1K
Thu Oct 18, 2018 10:17 pm
Forum: Photoelectric Effect
Topic: Work Function
Replies: 16
Views: 192

Re: Work Function

For problem 1.69b do you have to convert electron volts to joules, and then use the E=hc/frequency equation?
by Vanessa Reyes_1K
Thu Oct 18, 2018 9:42 pm
Forum: DeBroglie Equation
Topic: 1.59 6th edition
Replies: 1
Views: 53

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?
by Vanessa Reyes_1K
Thu Oct 18, 2018 9:15 pm
Forum: DeBroglie Equation
Topic: problem 43 6th edition
Replies: 4
Views: 130

problem 43 6th edition

For problem 43 in the 6th edition book, what is meant by "minimum uncertainty"? How do you solve for it?
by Vanessa Reyes_1K
Fri Oct 12, 2018 6:56 pm
Forum: Quantum Numbers and The H-Atom
Topic: #15 hw
Replies: 1
Views: 44

#15 hw

Hey for homework problem #15, 6th edition, can someone explain how to solve for n?
by Vanessa Reyes_1K
Fri Oct 12, 2018 6:42 pm
Forum: Quantum Numbers and The H-Atom
Topic: Balmer/Lyman... Series
Replies: 4
Views: 77

Re: Balmer/Lyman... Series

What exactly do these series represent in terms of energy?
by Vanessa Reyes_1K
Fri Oct 12, 2018 6:39 pm
Forum: Properties of Light
Topic: Exponents
Replies: 1
Views: 50

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?
by Vanessa Reyes_1K
Sat Oct 06, 2018 7:18 pm
Forum: Molarity, Solutions, Dilutions
Topic: hw problem F17
Replies: 1
Views: 62

hw problem F17

For homework problem F17 6th edition, what is meant by "mass spectrum"?
by Vanessa Reyes_1K
Sat Oct 06, 2018 7:10 pm
Forum: Empirical & Molecular Formulas
Topic: homework problem F9
Replies: 3
Views: 76

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?
by Vanessa Reyes_1K
Sat Oct 06, 2018 7:05 pm
Forum: Empirical & Molecular Formulas
Topic: homework problem E23
Replies: 2
Views: 76

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?

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