Search found 55 matches

by Clarissa Molina 1D
Sat Mar 17, 2018 1:54 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: cell diagram
Replies: 4
Views: 136

Re: cell diagram

When writing an oxidized and reduced species in the same phase are they always separated in the order (Oxidized, Reduced) in the cell diagram no matter what side of the cell diagram they're on?
by Clarissa Molina 1D
Sat Mar 17, 2018 1:49 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagram: Porous Disk and Salt Bridge
Replies: 5
Views: 192

Re: Cell Diagram: Porous Disk and Salt Bridge

Will we be told if a porous disk or salt bridge is being used or is there a way to figure that out?
by Clarissa Molina 1D
Sat Mar 17, 2018 1:45 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Rule when writing cell diagrams?
Replies: 5
Views: 182

Re: Rule when writing cell diagrams?

How can you tell which side a cathode or anode is on in a cell diagram?
by Clarissa Molina 1D
Sat Mar 17, 2018 1:41 pm
Forum: *Enzyme Kinetics
Topic: Final-Collision Theory
Replies: 3
Views: 353

Re: Final-Collision Theory

Can someone please explain the difference between the collision theory and the transition state theory?
by Clarissa Molina 1D
Sat Mar 17, 2018 1:37 pm
Forum: *Enzyme Kinetics
Topic: Enzyme
Replies: 5
Views: 390

Re: Enzyme

What is the difference between a homogeneous catalyst and a heterogeneous catalyst?
by Clarissa Molina 1D
Sat Mar 17, 2018 1:35 pm
Forum: *Enzyme Kinetics
Topic: Two Paths
Replies: 5
Views: 547

Re: Two Paths

When there are multiple paths, why is the faster one the one that determines the rate law? I'm still kind of confused on this concept
by Clarissa Molina 1D
Sat Mar 17, 2018 1:32 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Activation Energy
Replies: 5
Views: 310

Re: Activation Energy

How do you know which step is rate determining by looking at a graph interpretation of a reaction such as the one shown above?
by Clarissa Molina 1D
Sat Mar 17, 2018 1:29 pm
Forum: *Enzyme Kinetics
Topic: Catalysts in a reaction
Replies: 7
Views: 498

Re: Catalysts in a reaction

How can we tell if a substance is a catalyst or an intermediate?
by Clarissa Molina 1D
Sat Mar 17, 2018 1:27 pm
Forum: General Rate Laws
Topic: Rate Law
Replies: 6
Views: 451

Re: Rate Law

Just for clarification, a catalyst can appear in the rate law but an intermediate cannot?
by Clarissa Molina 1D
Sat Mar 17, 2018 3:42 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Rate and equilibrium constants
Replies: 3
Views: 120

Re: Rate and equilibrium constants

Do we use K=k/k' when there is only one step in a mechanism and K=(k1/k1') x (k2/k2') x ... when there are multiple steps?
by Clarissa Molina 1D
Sat Mar 17, 2018 3:33 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Slow Step Vs. Steady State Approximation
Replies: 3
Views: 149

Re: Slow Step Vs. Steady State Approximation

Can someone further explain when to use steady state approximation and the pre equilibrium approach please?
by Clarissa Molina 1D
Sat Mar 17, 2018 3:28 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Proposing a reaction mechanism
Replies: 5
Views: 153

Re: Proposing a reaction mechanism

Will we be told which step is the slow or fast step? If we are not told how do we find the slow step?
by Clarissa Molina 1D
Sat Mar 17, 2018 3:25 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Rate Determining
Replies: 7
Views: 243

Re: Rate Determining

Do you always ignore the reverse of the slow step? Why?
by Clarissa Molina 1D
Sat Mar 17, 2018 3:21 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Fast or Slow
Replies: 8
Views: 286

Re: Fast or Slow

I'm still sort of confused about the pre-equilibrium approach, can somebody please explain it?
by Clarissa Molina 1D
Sat Mar 17, 2018 3:16 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Slow Step in Reaction Mechanisms
Replies: 7
Views: 266

Re: Slow Step in Reaction Mechanisms

How do we know when to use the pre-equilibrium condition?
by Clarissa Molina 1D
Fri Mar 16, 2018 11:54 pm
Forum: Van't Hoff Equation
Topic: Exothermic and decrease in tempterature
Replies: 4
Views: 265

Re: Exothermic and decrease in tempterature

Raising the temperature of an exothermic reaction favors the formation of reactants while raising the temperature of an endothermic reaction favors the formation of products.
by Clarissa Molina 1D
Fri Mar 16, 2018 11:24 pm
Forum: Van't Hoff Equation
Topic: Van't Hoff
Replies: 9
Views: 453

Re: Van't Hoff

Is this equation only used when K1 at T1 is known?
by Clarissa Molina 1D
Fri Mar 16, 2018 11:16 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: reversible system
Replies: 9
Views: 390

Re: reversible system

Does deltaS total always equal 0 in a reversible process? Is it possible for deltaS to be 0 in an irreversible system, and why or why not?
by Clarissa Molina 1D
Fri Mar 16, 2018 11:11 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: State functions?
Replies: 9
Views: 384

Re: State functions?

Why are heat and work not state functions?
by Clarissa Molina 1D
Fri Mar 16, 2018 5:18 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: S=klnW
Replies: 7
Views: 1026

Re: S=klnW

Can someone explain what residual entropy is and is it found from just using this equation?
by Clarissa Molina 1D
Fri Mar 16, 2018 5:15 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: W
Replies: 3
Views: 277

Re: W

W= (# of possible orientations)^ (# of molecules). For example if you have 3 molecules and each molecule could be arranged in 10 ways then W= 10^3. You might have to use Avogadro's number like explained above.
by Clarissa Molina 1D
Fri Mar 16, 2018 5:10 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: Microstates
Replies: 2
Views: 263

Re: Microstates

You can calculate the number of microstates by using W= (# of possible orientations)^(# of molecules)
by Clarissa Molina 1D
Fri Mar 16, 2018 5:02 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: Boltzmann Equation
Replies: 3
Views: 280

Re: Boltzmann Equation

Yes, with an increase in temperature, there is an increase in available microstates so W increases as well. Since W increases, the entropy increases as well.
by Clarissa Molina 1D
Fri Mar 16, 2018 4:57 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: confused about 2nd law !!! [ENDORSED]
Replies: 3
Views: 353

Re: confused about 2nd law !!! [ENDORSED]

How do we know when to use the 2nd law or 3rd law equations? What is the main difference between these 2 laws?
by Clarissa Molina 1D
Fri Mar 16, 2018 4:54 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: ΔS = q/t vs. ΔS = nCln(T2/T1) [ENDORSED]
Replies: 2
Views: 295

Re: ΔS = q/t vs. ΔS = nCln(T2/T1) [ENDORSED]

Is Clausius' inequality, ΔS is greater than or equal to (q/T) always true or only under certain conditions?
by Clarissa Molina 1D
Fri Mar 16, 2018 4:34 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: delta s surroundings
Replies: 3
Views: 218

Re: delta s surroundings

The heat that leaves the system enters the surroundings so q(surr)= - q
by Clarissa Molina 1D
Mon Mar 12, 2018 3:31 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat Capacities of Gases
Replies: 3
Views: 270

Re: Heat Capacities of Gases

How do we know when to use the different R values? When would 3/2R or 5/2R be used?
by Clarissa Molina 1D
Mon Mar 12, 2018 3:27 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bonds formed - negative?
Replies: 3
Views: 145

Re: Bonds formed - negative?

Just for clarification, would the bond enthalpy values in the reactants be positive and the bond enthalpy values for the products be negative?
by Clarissa Molina 1D
Mon Mar 12, 2018 3:21 pm
Forum: Phase Changes & Related Calculations
Topic: Correct Answer For Test 1 Question 7
Replies: 4
Views: 308

Re: Correct Answer For Test 1 Question 7

For the set up for this problem, how did you get 16675.91565 for the first part of the equation?
by Clarissa Molina 1D
Mon Mar 12, 2018 3:14 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Heat Required to Heat a Substance
Replies: 5
Views: 217

Re: Heat Required to Heat a Substance

For test 1 question 3, it states "when a balloon filled with gas is expanded to a larger volume and lower pressure while maintaining the same temperature," how is heat being transferred in this process?
by Clarissa Molina 1D
Mon Mar 12, 2018 2:56 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Reaction enthalpy
Replies: 2
Views: 121

Re: Reaction enthalpy

When calculating the reaction enthalpy using mean bond enthalpy values vs standard enthalpies of formation values, why is there a difference between answers?
by Clarissa Molina 1D
Mon Mar 12, 2018 2:49 pm
Forum: Phase Changes & Related Calculations
Topic: The universe
Replies: 9
Views: 305

Re: The universe

Would a 20mL vial filled with an organic solvent be open or isolated? and why?
by Clarissa Molina 1D
Sat Dec 09, 2017 9:59 pm
Forum: Lewis Acids & Bases
Topic: Lewis Acids/Bases vs Bronsted Acids/Bases
Replies: 3
Views: 183

Re: Lewis Acids/Bases vs Bronsted Acids/Bases

How can you tell between a Lewis acid and Lewis base by looking at the lewis structure?
by Clarissa Molina 1D
Sat Dec 09, 2017 5:51 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Endothermic v. Exothermic Reactions
Replies: 9
Views: 841

Re: Endothermic v. Exothermic Reactions

How does an endothermic or exothermic reaction affect the direction of the reaction?
by Clarissa Molina 1D
Sat Dec 09, 2017 5:48 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE table
Replies: 7
Views: 410

Re: ICE table

Can somebody explain the 5% rule when approximating x please? Is K being less than 10^-3 enough to be able to approximate or does it also have to follow the 5% rule?
by Clarissa Molina 1D
Sat Dec 09, 2017 1:47 am
Forum: Octet Exceptions
Topic: Beryllium exception
Replies: 4
Views: 412

Re: Beryllium exception

Are Be and Li the only atoms that form duplets or do other atoms form duplets as well?
by Clarissa Molina 1D
Sat Dec 09, 2017 12:39 am
Forum: Trends in The Periodic Table
Topic: why carbon has a higher electron affinity than nitrogen.
Replies: 5
Views: 2670

Re: why carbon has a higher electron affinity than nitrogen.

What is the overall trend for electron affinity? And are there any exceptions to the trend?
by Clarissa Molina 1D
Sat Dec 09, 2017 12:36 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 3
Views: 209

Re: Bond Angles

Will we be required to know the bond angles on certain molecular shapes and how lone pairs affect the angles?
by Clarissa Molina 1D
Sat Dec 09, 2017 12:34 am
Forum: Bond Lengths & Energies
Topic: Bond Length and Bond Strength Relationship
Replies: 5
Views: 463

Re: Bond Length and Bond Strength Relationship

What is the relationship between bond length and bond strength?
by Clarissa Molina 1D
Fri Dec 08, 2017 9:19 pm
Forum: Bond Lengths & Energies
Topic: Double Bond vs Triple Bond
Replies: 7
Views: 604

Re: Double Bond vs Triple Bond

Are there any restrictions to drawing double bonds or triple bonds between certain atoms in lewis structures?
by Clarissa Molina 1D
Fri Dec 08, 2017 8:21 pm
Forum: Ionic & Covalent Bonds
Topic: 3.23
Replies: 3
Views: 197

Re: 3.23

Which elements are able to exist in both positive and negative oxidation states? Is there a way to determine that or do we just have to memorize which elements this applies to?
by Clarissa Molina 1D
Fri Dec 08, 2017 8:17 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Unpaired Electrons [ENDORSED]
Replies: 7
Views: 331

Re: Unpaired Electrons [ENDORSED]

Will we only be asked to give the number of unpaired electrons for ground state configurations?
by Clarissa Molina 1D
Fri Dec 08, 2017 1:07 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: unpaired electrons [ENDORSED]
Replies: 3
Views: 210

Re: unpaired electrons [ENDORSED]

How can you tell if a an electron configuration represents the ground state or an excited state of an atom?
by Clarissa Molina 1D
Fri Dec 08, 2017 1:01 am
Forum: Quantum Numbers and The H-Atom
Topic: Valence electrons [ENDORSED]
Replies: 7
Views: 398

Re: Valence electrons [ENDORSED]

For question 2.37b, why are electrons in an s-orbital more effective than those in other orbitals at shielding electrons from nuclear charge?
by Clarissa Molina 1D
Fri Dec 08, 2017 12:49 am
Forum: Quantum Numbers and The H-Atom
Topic: 2.29 parts b and d
Replies: 4
Views: 316

Re: 2.29 parts b and d

I am still a little confused, how do you determine how many electrons can have certain quantum numbers?
In 2.29a with the quantum numbers n=2 and l=1, the answer is 6 electrons, but why is that the answer?
by Clarissa Molina 1D
Wed Dec 06, 2017 9:05 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polar vs nonpolar vs ionic
Replies: 11
Views: 1243

Re: Polar vs nonpolar vs ionic

How can we tell if the dipole moments cancel out or not? I am still a little confused about that concept.
by Clarissa Molina 1D
Wed Dec 06, 2017 8:49 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Test 4 [ENDORSED]
Replies: 4
Views: 283

Re: Test 4 [ENDORSED]

How can we determine if there is a dipole moment? For example, for NO2 on Test 4 the correct answer was yes there is a dipole moment, but do we determine that by looking at the lewis structure?
by Clarissa Molina 1D
Wed Dec 06, 2017 8:44 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: How to tell if bidentate, tri- etc
Replies: 5
Views: 424

Re: How to tell if bidentate, tri- etc

How is a chelate different than a polydentate?
by Clarissa Molina 1D
Wed Dec 06, 2017 8:36 pm
Forum: Naming
Topic: (en) and (EDTA)
Replies: 2
Views: 158

Re: (en) and (EDTA)

How do we determine the coordination number of the metal ion when the complex has (en) or (edta) or (ox)?
by Clarissa Molina 1D
Wed Dec 06, 2017 8:30 pm
Forum: Naming
Topic: Suffixes
Replies: 4
Views: 289

Re: Suffixes

For prefixes, in what cases would bis- tris- and tetrakis- be used?
by Clarissa Molina 1D
Wed Dec 06, 2017 8:23 pm
Forum: Naming
Topic: Naming Coordination Compounds
Replies: 8
Views: 321

Re: Naming Coordination Compounds

Does anyone know the difference between writing CN as cyanido or cyano? The solution manual uses cyano to denote CN, but in table 17.4 it is listed as cyanido, does it matter which name is used?
by Clarissa Molina 1D
Sun Oct 15, 2017 6:23 pm
Forum: Photoelectric Effect
Topic: Balmer vs Lyman [ENDORSED]
Replies: 5
Views: 283

Re: Balmer vs Lyman [ENDORSED]

Along with the wavelengths within the Balmer and Lyman series, will we need to memorize the wavelengths in the electromagnetic spectrum? Or will they be given to us?
by Clarissa Molina 1D
Sun Oct 15, 2017 6:16 pm
Forum: Properties of Light
Topic: Question about speed of light rounding
Replies: 4
Views: 230

Re: Question about speed of light rounding

Regarding the constant for the speed of light, should we always use 2.99792 x 10^8 or is it okay to round to 3.0 x 10^8? In the lectures 3.0x10^8 is used, but on the constants and equations sheet it says 2.99792 x 10^8
by Clarissa Molina 1D
Thu Oct 05, 2017 10:56 pm
Forum: Balancing Chemical Reactions
Topic: incomplete combustion
Replies: 3
Views: 322

Re: incomplete combustion

Are we expected to know terms such as incomplete combustion and understand how that affects the chemical equation or will the problem state which compounds are involved?
by Clarissa Molina 1D
Thu Oct 05, 2017 10:48 pm
Forum: Empirical & Molecular Formulas
Topic: Combustion Analysis
Replies: 5
Views: 288

Re: Combustion Analysis

Do C, H, and O all have to be present in order for it to be a combustion analysis problem, and will the problem state which elements are involved?

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