Search found 57 matches

by Esin Gumustekin 2J
Thu Mar 15, 2018 8:45 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius Equation
Replies: 1
Views: 117

Re: Arrhenius Equation

Then we would use the equation: ln(K2/K1)=E/R (1/T1-1/T2). This equation is given on page 642 of the textbook.
by Esin Gumustekin 2J
Thu Mar 15, 2018 8:38 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Reaction profiles
Replies: 1
Views: 115

Re: Reaction profiles

I believe we would have to be told which step is slow and which step is fast. Then we would be able to draw the reaction profile. The slow step would be the one with the greater activation energy and the fast step would be the one with the smaller activation energy.
by Esin Gumustekin 2J
Thu Mar 15, 2018 8:34 pm
Forum: *Alkanes
Topic: Organic chemistry [ENDORSED]
Replies: 3
Views: 437

Re: Organic chemistry [ENDORSED]

I believe we should just know how to identify the functional groups we went over in class (alcohol, ether, aldehyde, ketone, carboxyl, amine).
by Esin Gumustekin 2J
Sat Mar 10, 2018 9:58 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Transition States [ENDORSED]
Replies: 2
Views: 86

Transition States [ENDORSED]

Molecules in the transition state always need to be higher in energy than both the reactants and products right?
by Esin Gumustekin 2J
Sat Mar 10, 2018 9:53 am
Forum: *Nucleophiles
Topic: What is a nucleophile? [ENDORSED]
Replies: 6
Views: 471

Re: What is a nucleophile? [ENDORSED]

Does this mean that a nucleophile is always negatively charged?
by Esin Gumustekin 2J
Sat Mar 10, 2018 9:46 am
Forum: First Order Reactions
Topic: Units of Reactions. [ENDORSED]
Replies: 5
Views: 445

Re: Units of Reactions. [ENDORSED]

If you forget the units, plug in mol/Ls for the rate and mol/L for the concentration of A and find k according to what power A is raised to (so that the units cancel on both sides of the equation). I usually don't memorize the units for the rate constant but find it like this when I need to.
by Esin Gumustekin 2J
Thu Mar 01, 2018 11:41 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: 15.15 [ENDORSED]
Replies: 5
Views: 226

Re: 15.15 [ENDORSED]

The order of each reactant is first order. I believe this would mean that the overall reaction order is second order.
by Esin Gumustekin 2J
Thu Mar 01, 2018 11:39 am
Forum: General Rate Laws
Topic: K value related to half life
Replies: 2
Views: 95

Re: K value related to half life

For all half life equations, there is always an inverse relationship between k and time. For this reason, a large k means time is small which means that it is a fast reaction. Hope this helps!
by Esin Gumustekin 2J
Thu Mar 01, 2018 11:35 am
Forum: First Order Reactions
Topic: Overall reaction order
Replies: 2
Views: 1294

Re: Overall reaction order

I believe the overall reaction order is the sum of the orders of each reactant in the rate law. I'm not sure what the n and m stand for so I'm confused on that too.
by Esin Gumustekin 2J
Sat Feb 24, 2018 10:06 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: units of the rate of reaction
Replies: 7
Views: 419

Re: units of the rate of reaction

So what are the units of K, or do the units of K vary?
by Esin Gumustekin 2J
Sat Feb 24, 2018 9:57 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: Differential Rate Law
Replies: 3
Views: 134

Re: Differential Rate Law

Yes it is possible for none of the reactant concentrations to affect the rate. This would mean that the order is 0. I believe Dr. Lavelle is going to go through examples of this next week.
by Esin Gumustekin 2J
Sat Feb 24, 2018 9:55 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Strongly Reducing Metals
Replies: 5
Views: 201

Re: Strongly Reducing Metals

The more negative the standard cell potential for that half reaction, the stronger the reducing agent.
by Esin Gumustekin 2J
Sat Feb 17, 2018 10:17 am
Forum: Balancing Redox Reactions
Topic: Balancing Redox Reactions
Replies: 1
Views: 111

Balancing Redox Reactions

Does anyone know if Dr. Lavelle prefers us using H+ in acidic solutions or H3O+? In my discussion, we used H3O+ but the textbook as well as the Redox reaction worksheet on his website uses H+.
by Esin Gumustekin 2J
Mon Feb 12, 2018 9:17 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Equations
Replies: 4
Views: 347

Re: Equations

I don't believe we do. If it's not on the equation sheet and we need it, I believe Dr. Lavelle would give it to us in the problem.
by Esin Gumustekin 2J
Mon Feb 12, 2018 9:16 pm
Forum: Phase Changes & Related Calculations
Topic: Is Energy a state function?
Replies: 1
Views: 179

Is Energy a state function?

Is Energy a state function?
by Esin Gumustekin 2J
Mon Feb 12, 2018 8:59 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: General Question on these equations
Replies: 1
Views: 78

General Question on these equations

For delta S=nClnT2/T1, this only works for when there is constant volume right? And for delta S=nRlnV2/V1 we can use this equation when there are isothermal conditions right?
by Esin Gumustekin 2J
Sun Feb 11, 2018 12:07 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 8.103
Replies: 2
Views: 232

8.103

For 8.103, it asks us to find the molar kinetic energy of Kr. However, I looked at the equation sheet on Dr. Lavelle's website and it does not give this formula. Does this mean that we don't need to know this equation?
by Esin Gumustekin 2J
Sat Feb 10, 2018 7:24 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Sig Figs in 11.19
Replies: 2
Views: 142

Sig Figs in 11.19

For 11.19, the solution manual just gives the answers in 1 sig fig. However, shouldn't it have 2 sig figs since we are given temperature in 2 sig figs?
by Esin Gumustekin 2J
Sat Feb 10, 2018 2:46 pm
Forum: Biological Examples (*DNA Structural Transitions, etc.)
Topic: 9.107 [ENDORSED]
Replies: 1
Views: 314

9.107 [ENDORSED]

For this problem, the solution manual states that "the formation of complex molecules from simpler precursors would not be spontaneous, because such processes create order from disorder". However, since complex molecules have more ways to rearrange themselves (and would have more vibration...
by Esin Gumustekin 2J
Tue Feb 06, 2018 9:07 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Pressure and Volume
Replies: 3
Views: 92

Pressure and Volume

In terms of volume, should we always use liters for the equation nRlnV2/V1? Also, in terms of pressure, should we always use atm?
by Esin Gumustekin 2J
Tue Feb 06, 2018 9:03 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 9.31
Replies: 2
Views: 115

9.31

For 9.31, how are we supposed to know that ethene is a gas while polyethylene is a solid and thus ethene has a higher entropy than polyethlene. Since we are not given this information in the question, how would we figure out this problem?
by Esin Gumustekin 2J
Tue Feb 06, 2018 9:00 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 9.13
Replies: 6
Views: 227

Re: 9.13

Naveed Zaman 1C wrote:The answer key doesn't use C of any kind... Are you perhaps looking at the wrong problem?


This problem has an error in it so it is listed on Dr. Lavelle's website on the Solution Manual Errors Document. In this document, Cv is used.
by Esin Gumustekin 2J
Tue Feb 06, 2018 7:54 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 9.13
Replies: 6
Views: 227

9.13

For 9.13, why does the answer key use Cv instead of Cp? In this problem the volume is not constant as it is being compressed so shouldn't we use Cp?
by Esin Gumustekin 2J
Thu Feb 01, 2018 9:35 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 8.85
Replies: 3
Views: 196

Re: 8.85

For part a, delta H is 180.6kJ/mol reaction. Since there are 2 moles of NO per mole of reaction, delta H is 180.6KJ/2mol NO. If you multiply this number by 1.55 mol NO you will find the heat absorbed in the reaction. In this case, the answer comes out to be 140kJ
by Esin Gumustekin 2J
Thu Feb 01, 2018 9:15 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 9.7
Replies: 7
Views: 230

9.7

Does anyone understand the equation Cp=5/2R? It is used in this problem and I don't understand what this equation is and why we need to use it for this problem.

Thanks!
by Esin Gumustekin 2J
Thu Feb 01, 2018 9:15 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 9.7
Replies: 3
Views: 122

9.7

Does anyone understand the equation Cp=5/2R? It is used in this problem and I don't understand what this equation is and why we need to use it for this problem.

Thanks!
by Esin Gumustekin 2J
Thu Feb 01, 2018 8:42 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 9.1
Replies: 1
Views: 107

9.1

In part a in question 9.1, the solution manual puts a negative sign in front of the rate of heat generation then drops it in the final answer. Is this an error in the manual?
by Esin Gumustekin 2J
Wed Jan 24, 2018 3:27 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: What are the types of calorimeters we learned about/ covered in class?
Replies: 4
Views: 209

Re: What are the types of calorimeters we learned about/ covered in class?

We also learned about simple coffee calorimeters in which we could measure the heat transfer by using a thermometer.
by Esin Gumustekin 2J
Wed Jan 24, 2018 3:23 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Question about today's lecture 1/24/18
Replies: 1
Views: 99

Re: Question about today's lecture 1/24/18

In that example, the gas was doing work by pulling a weight a vertical distance up. Thus work was done by pulling the mass (force) over a specific distance (d).
by Esin Gumustekin 2J
Mon Jan 22, 2018 9:51 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 8.99 Enthalpies of Formation [ENDORSED]
Replies: 3
Views: 174

Re: 8.99 Enthalpies of Formation [ENDORSED]

For this question, how do we know that Zn is 2+. It is not stated anywhere in the problem so how could we determine this?
by Esin Gumustekin 2J
Wed Jan 17, 2018 7:16 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Born Haber
Replies: 2
Views: 125

Re: Born Haber

In Outline 1 on the Chem 14B website, it states to omit section 8.18 which is the section on the Born-Haber Cycle. Thus, I believe that this information will not be on the test.
by Esin Gumustekin 2J
Wed Jan 17, 2018 7:07 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Question 8.29
Replies: 2
Views: 141

Re: Question 8.29

Just to add on, since complex molecules have more atoms, they have more possible bond vibrations that can absorb more energy.
by Esin Gumustekin 2J
Wed Jan 17, 2018 7:00 pm
Forum: Calculating Work of Expansion
Topic: Free Expansion
Replies: 2
Views: 131

Re: Free Expansion

An example of free expansion is when a gas is allowed to expand into a vacuum. Since there is no opposing force, w=0 and thus the system does no work. The book states that "expansion against zero pressure is called free expansion".

Hope this helps!
by Esin Gumustekin 2J
Sat Jan 13, 2018 8:55 pm
Forum: Phase Changes & Related Calculations
Topic: Question 8.43
Replies: 1
Views: 112

Question 8.43

Can someone please help me with this problem? I don't have the solutions manual currently with me so I would really appreciate some help on how to do this problem.

Thanks!
by Esin Gumustekin 2J
Sat Jan 13, 2018 8:46 pm
Forum: Calculating Work of Expansion
Topic: Work (in general) [ENDORSED]
Replies: 4
Views: 179

Re: Work (in general) [ENDORSED]

To find work I always use Work = Fd (opposing force x distance moved). I don't think we learned any other formulas including work in lecture yet.
by Esin Gumustekin 2J
Sat Jan 13, 2018 8:11 pm
Forum: Phase Changes & Related Calculations
Topic: Most stable phases for halogens
Replies: 3
Views: 173

Most stable phases for halogens

In Friday's lecture, Dr. Lavelle mentioned what the most stable phase is (whether it is solid, liquid or gas) for halogens as well as a few other elements on the periodic table. Can someone please list the most stable phases for the halogens as well as any other ones he mentioned in class. Thank you!
by Esin Gumustekin 2J
Fri Dec 08, 2017 10:46 am
Forum: DeBroglie Equation
Topic: Concept of deBroglie
Replies: 3
Views: 197

Re: Concept of deBroglie

The deBroglie equation only applies to objects with mass since the equation is h/p (p=mv). Light does not have mass and thus you can not apply the deBroglie equation to it. Instead to find the wavelength of light you would use c=(wavelength)v or E=hc/wavelength.

Hope this helps!
by Esin Gumustekin 2J
Fri Dec 08, 2017 10:43 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Sigma and Pi bonds
Replies: 1
Views: 247

Re: Sigma and Pi bonds

If there was a double bond between the two carbons you would write: sigma (C2sp2, C2sp2) and pi (C2p, C2p). The 2 in front of the sp2 indicates what shell the electron belongs to.

Hope this helps!
by Esin Gumustekin 2J
Wed Nov 29, 2017 12:36 pm
Forum: Naming
Topic: 17.29 a and c
Replies: 2
Views: 149

Re: 17.29 a and c

Either cyano or cyanido can be used when naming compounds. Cyanido is a more recent addition to the IUPAC naming conventions. On an exam, I believe we can use either convention.
by Esin Gumustekin 2J
Wed Nov 29, 2017 12:31 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Unit conversions
Replies: 1
Views: 114

Re: Unit conversions

If we are given the molecule in mmol I think we are supposed to convert it to mol because we can then solve for M to plug into the ICE table. For pressure, the textbook states to always use bar. The conversion factor between bar and atm is extremely close though so it would not make such a big diffe...
by Esin Gumustekin 2J
Sat Nov 25, 2017 12:36 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: polydentate? 17.33
Replies: 3
Views: 216

Re: polydentate? 17.33

I think we can determine if something is polydentate by looking at how many lone pairs the molecule has because the lone pairs may be used for bonding to a metal center. However, I'm also confused on this problem because Table 17.4 doesn't state that CO3 2- is bidentate but the answer key for that p...
by Esin Gumustekin 2J
Sat Nov 25, 2017 12:27 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kp units
Replies: 1
Views: 107

Re: Kp units

Kp like Kc does not have units; they are omitted for the calculation.
by Esin Gumustekin 2J
Sat Nov 18, 2017 2:48 pm
Forum: Hybridization
Topic: 4.43
Replies: 1
Views: 119

4.43

Can somebody please explain how to do number 4.43 in the textbook? What does it mean when it says that the s character of the hybrids is increased?
by Esin Gumustekin 2J
Sat Nov 18, 2017 2:21 pm
Forum: Bond Lengths & Energies
Topic: Regions of Electron Density
Replies: 4
Views: 255

Re: Regions of Electron Density

A double bond is considered one region of electron density. A triple bond is also one region of electron density like a double and single bond. Hope this helps!
by Esin Gumustekin 2J
Wed Nov 08, 2017 10:48 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 3d atoms [ENDORSED]
Replies: 2
Views: 178

Re: 3d atoms [ENDORSED]

When writing electron configurations, I believe you always write the 3d block before writing the 4s and 4p blocks. The 3d block is lower in energy so even if the entire block is not full you write it before the 4s block. For example, for Vanadium you would write [Ar]3d^3 4s^2. So even though, the 3d...
by Esin Gumustekin 2J
Wed Nov 08, 2017 10:44 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty in position
Replies: 2
Views: 180

Re: Uncertainty in position

When doing Heisenberg's formula, you usually want to determine the uncertainty in position by using the diameter. You want to find the entire length the electron or object could be moving within. For example, if you want to find the uncertainty in position of an electron in an atom, you would say th...
by Esin Gumustekin 2J
Tue Oct 31, 2017 4:52 pm
Forum: *Shrodinger Equation
Topic:
Replies: 4
Views: 365

Re: Hψ

Just to add on, this equation is telling us that if you multiply a Hamiltonian by a wavefunction you will get the same wavefunction out multiplied by its energy.
by Esin Gumustekin 2J
Tue Oct 31, 2017 4:45 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Homework Problem 2.55
Replies: 5
Views: 261

Re: Homework Problem 2.55

I believe it is referring to group 5 which contains elements such as V, Nb and Ta. Group 1 should be the alkali metals. I believe there is an error with the answer key and that the correct answer should be (n-1)d^3 ns^2.
by Esin Gumustekin 2J
Wed Oct 25, 2017 3:07 pm
Forum: *Shrodinger Equation
Topic: Applying the Shrodinger Equation
Replies: 3
Views: 255

Re: Applying the Shrodinger Equation

Anna Goldberg 1C wrote:Are we supposed to be able to perform calculations with the Schrodinger Equation?


I don't think we will be asked to perform calculations with the Schrodinger Equation. Instead, we need to know what it represents/means.
by Esin Gumustekin 2J
Wed Oct 25, 2017 2:58 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.75
Replies: 2
Views: 133

Re: 2.75

Since ionization energy increases as you go from left to right on the periodic table, the ionization energies of the s block elements are much lower than for the p block elements. Thus, it is much easier for s block elements to lose electrons in chemical reactions. Therefore, they are more reactive....
by Esin Gumustekin 2J
Tue Oct 17, 2017 2:16 pm
Forum: Properties of Light
Topic: Homework 1.3
Replies: 2
Views: 166

Re: Homework 1.3

The amplitude of a wave corresponds to the oscillating electric field of the wave. If the frequency decreases, the wavelength increases from the relationship c=(wavelength)(frequency). When the wavelength increases, the slope of the wave decreases. Thus the extent of change (slope of the wave) of th...
by Esin Gumustekin 2J
Tue Oct 17, 2017 2:06 pm
Forum: Properties of Light
Topic: Homework 1.11
Replies: 2
Views: 172

Re: Homework 1.11

For the Lyman series, the lower energy level is always n=1 and for the Balmer series the lower energy level is always n=2. For each of these series, they can have a higher energy level at n=3,4,5 etc but their lower energy level will always be the same. I hope this helps!
by Esin Gumustekin 2J
Tue Oct 10, 2017 6:24 pm
Forum: Properties of Light
Topic: Question 1.23
Replies: 2
Views: 295

Question 1.23

Can someone please explain what an eV is? It is much smaller than a Joule but can someone please explain what it signifies?
by Esin Gumustekin 2J
Tue Oct 10, 2017 6:11 pm
Forum: Properties of Light
Topic: Chapter 1 #3
Replies: 9
Views: 409

Re: Chapter 1 #3

I'm still confused on this problem. Isn't the amplitude of the wave staying the same? I know that the frequency of the wave is decreasing but that doesn't mean that the amplitude is also decreasing. So, how can we say that the electric field is decreasing if the amplitude is staying the same?
by Esin Gumustekin 2J
Thu Oct 05, 2017 7:49 pm
Forum: SI Units, Unit Conversions
Topic: Formula Units
Replies: 7
Views: 359

Re: Formula Units

Great, thank you!
by Esin Gumustekin 2J
Thu Oct 05, 2017 7:24 pm
Forum: Empirical & Molecular Formulas
Topic: L.39
Replies: 5
Views: 347

Re: L.39

For this problem, does anyone understand why we assume that the oxygen in the air is O and not O2? I thought oxygen in the air is always in the form of O2.
by Esin Gumustekin 2J
Thu Oct 05, 2017 7:14 pm
Forum: SI Units, Unit Conversions
Topic: Formula Units
Replies: 7
Views: 359

Formula Units

I read through the definition of a formula unit in the textbook but am still a little confused on it. Is it analogous to a molecule for a covalent compound but instead for ionic compounds?

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