Arrange the following substances in order of increasing standard molar entropy:
CHF3(g), CF4(g), CH3F(g), CH2F2(g)
The answer was CH3F (g) < CH2F2 (g) < CHF3 (g) < CF4 (g), but I don't understand why CF4 was placed last while CH3F is placed first. Is molar entropy not based on polarity?
Search found 50 matches
- Mon Mar 13, 2017 5:22 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Increasing Standard Molar Entropy
- Replies: 1
- Views: 610
- Mon Mar 13, 2017 9:41 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram and Pt(s)
- Replies: 4
- Views: 671
Cell Diagram and Pt(s)
How do we know when to add the Pt(s) in our cell diagrams?
- Fri Mar 10, 2017 12:54 pm
- Forum: *Nucleophilic Substitution
- Topic: Electrophilic Aromatic Substitution
- Replies: 1
- Views: 777
Electrophilic Aromatic Substitution
I was wondering if electrophilic aromatic substitution and nucleophilic substitution reaction were similar or how are they different from each other?
- Mon Mar 06, 2017 9:25 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: What is the catalyst in this reaction? [ENDORSED]
- Replies: 2
- Views: 1785
- Thu Mar 02, 2017 2:47 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Rate Determining Step
- Replies: 1
- Views: 332
Rate Determining Step
If given a proposed mechanism and the rate, how can you tell which step in the mechanism is likely to be the rate determining step?
- Mon Feb 27, 2017 11:39 pm
- Forum: *Alkanes
- Topic: Name the compound
- Replies: 4
- Views: 557
Name the compound
(CH3)2CHCH(CH2CH3)2
I get confuse when the compound is written like this. If possible, can you draw its line structure please. Thank you
I get confuse when the compound is written like this. If possible, can you draw its line structure please. Thank you
- Sat Feb 25, 2017 10:28 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: What is the catalyst in this reaction? [ENDORSED]
- Replies: 2
- Views: 1785
What is the catalyst in this reaction? [ENDORSED]
Step 1: O3 + NO --> NO2 + O2
Step 2: NO2 + O --> NO + O2
What is the catalyst in this reaction? How can you tell?
Step 2: NO2 + O --> NO + O2
What is the catalyst in this reaction? How can you tell?
- Fri Feb 17, 2017 11:43 am
- Forum: General Rate Laws
- Topic: Overall Rate Law from Proposed Mechanism
- Replies: 1
- Views: 309
Overall Rate Law from Proposed Mechanism
The proposed two step mechanism for a reaction is H2AH2A + B --> BH^+ + HA^- and its reverse, both of which are fast, followed by HA^- + B --> BH ^+ + A^2-, which is slow.
Find the rate law with HA^- treated as the intermediate and write the equation for the overall reaction.
Find the rate law with HA^- treated as the intermediate and write the equation for the overall reaction.
- Tue Feb 07, 2017 11:50 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Calculating the change in molar entropy
- Replies: 1
- Views: 312
Calculating the change in molar entropy
Calculate the change in molar entropy of an ideal gas when it is compressed isothermally to 1/3 its initial volume.
- Sat Feb 04, 2017 10:05 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: calculating reaction Gibbs free energy
- Replies: 1
- Views: 242
calculating reaction Gibbs free energy
The reaction taking place in the silver cell used in some cameras and wristwatches in Ag2O(s) + Zn(s) --> 2Ag(s) + ZnO(s), and the cell potential when new is +1.6V. What is the reaction Gibbs free energy?
- Wed Jan 25, 2017 2:27 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Calculating Energy Changes When Heating an Ideal Gas
- Replies: 1
- Views: 298
Calculating Energy Changes When Heating an Ideal Gas
Calculate the final temperature and the change in internal energy when 500. J of energy is transferred as heat to 0.900 mol Ne (g) at 298 K and 1.00 atm
a) at constant volume
b) at constant pressure
Treat the gas as ideal.
a) at constant volume
b) at constant pressure
Treat the gas as ideal.
- Wed Jan 25, 2017 1:45 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Calculate work and internal energy
- Replies: 1
- Views: 315
Calculate work and internal energy
Suppose that 1.00 kJ of energy is transferred as heat to oxygen in a cylinder fitted with a piston; the external pressure is 2.00 atm. The oxygen expands from 1.00 L to 3.00 L against this constant pressure. Calculate w and internal energy (delta U) for the entire process by treating the O2 as an id...
- Wed Jan 25, 2017 12:58 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Calculating Internal Energy Change
- Replies: 1
- Views: 359
Calculating Internal Energy Change
A calorimeter was calibrated by mixing two aqueous solutions together, each of volume 0.100L. The heat output of the reaction that took place was known to be 4.16kJ, and the temperature of the calorimeter rose by 3.24 degrees C. Calculate the heat capacity of this calorimeter when it contains 0.200 ...
- Fri Jan 20, 2017 2:10 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Calculating work of isothermal expansion [ENDORSED]
- Replies: 1
- Views: 411
Calculating work of isothermal expansion [ENDORSED]
A cylinder of volume 2.00 L contains 1.00 mol He (g) immersed in a constant-temperature water bath held at 30 degrees Celsius. Which process does more work on the surroundings, allowing the gas to expand isothermally to 4.00 L against a constant external pressure of 1.00 atm or allowing it to expand...
- Fri Dec 02, 2016 1:02 pm
- Forum: Trends in The Periodic Table
- Topic: Which is larger O - or S 2- ? [ENDORSED]
- Replies: 3
- Views: 730
Which is larger O - or S 2- ? [ENDORSED]
Which anion is larger O ^- or S ^ 2- ?
Give two reasons why.
Give two reasons why.
- Fri Dec 02, 2016 12:59 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Midterm Q.5B
- Replies: 2
- Views: 472
Midterm Q.5B
What is the subshell notation and the total number of orbitals having the quantum numbers n=3, l=2, for a given element?
I got subshell notation to be 3d and total number of orbitals to be 10, why is this wrong?
I got subshell notation to be 3d and total number of orbitals to be 10, why is this wrong?
- Fri Dec 02, 2016 12:46 pm
- Forum: Photoelectric Effect
- Topic: Midterm 3B
- Replies: 1
- Views: 378
Midterm 3B
The photoelectric experiment became known as the photoelectric effect. What was the major conceptual change as a result of this experiment?
- Wed Nov 16, 2016 10:54 pm
- Forum: Naming
- Topic: What's the formula for this coordination compound?
- Replies: 2
- Views: 2016
What's the formula for this coordination compound?
Dibromobis(ethylenediamine)cobalt(III)sulfate
- Mon Nov 07, 2016 9:11 pm
- Forum: Naming
- Topic: Name this compound
- Replies: 1
- Views: 1042
Name this compound
From textbook self test 17.3B: Name the compound [CoBr(NH3)5]SO4
Write the formula of tetraamminediaquachromium(III)bromide
Thank you!
Write the formula of tetraamminediaquachromium(III)bromide
Thank you!
- Fri Nov 04, 2016 10:14 am
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: 4.61 Homework Question
- Replies: 3
- Views: 605
4.61 Homework Question
Give the valence-shell electron configurations and bond orders for CO and CO+. Which has a stronger bond?
- Sat Oct 29, 2016 12:24 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Can you present VSEPR theory without having to deal with Lewis Structures?
- Replies: 1
- Views: 317
Can you present VSEPR theory without having to deal with Lewis Structures?
Is there a way to present VSEPR theory without having to deal with Lewis structures?
- Sat Oct 29, 2016 12:20 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: What would be the shape of Ethyne?
- Replies: 1
- Views: 1278
What would be the shape of Ethyne?
Why is the shape of ethyne linear when there three bonds instead of 2 like in BeCl2 ?
- Fri Oct 28, 2016 12:20 pm
- Forum: Lewis Structures
- Topic: Lewis Structure of XeF2
- Replies: 1
- Views: 902
Lewis Structure of XeF2
Why does the lewis structure for XeF2 have Xe with three lone pairs instead of just two to complete an octet?
- Tue Oct 25, 2016 11:00 pm
- Forum: Trends in The Periodic Table
- Topic: Quiz 2 Typo?
- Replies: 3
- Views: 614
Re: Quiz 2 Typo?
Ohhhh okay that makes sense...I kept thinking it was L . oops :D
- Tue Oct 25, 2016 7:44 pm
- Forum: Trends in The Periodic Table
- Topic: Quiz 2 Typo?
- Replies: 3
- Views: 614
Quiz 2 Typo?
In the Quiz 2 Preparation number 1: For each pair of compounds below, circle the compound that contains bonds with greater ionic character:
the last option states: AgF or Agl
what is Agl?
the last option states: AgF or Agl
what is Agl?
- Tue Oct 25, 2016 7:33 pm
- Forum: Hybridization
- Topic: Will hybrid orbitals be on the quiz?
- Replies: 2
- Views: 334
Will hybrid orbitals be on the quiz?
Will questions like what if the hybridization of the central atom in a molecule or what are the hybrid orbitals be on the the upcoming quiz?
- Tue Oct 25, 2016 7:08 pm
- Forum: Lewis Structures
- Topic: Why is He2 not a stable molecule? [ENDORSED]
- Replies: 1
- Views: 4659
Why is He2 not a stable molecule? [ENDORSED]
Using molecular orbital theory, state why He2 not a stable molecule?
Thank you!
Thank you!
- Tue Oct 25, 2016 7:06 pm
- Forum: Trends in The Periodic Table
- Topic: What is the difference between electron affinity and electronegativity?
- Replies: 3
- Views: 754
Re: What is the difference between electron affinity and electronegativity?
That really helps, thank you!
- Fri Oct 21, 2016 11:36 am
- Forum: Trends in The Periodic Table
- Topic: What is the difference between electron affinity and electronegativity?
- Replies: 3
- Views: 754
What is the difference between electron affinity and electronegativity?
What is the difference between electron affinity and electronegativity?
They seem similar to me.
They seem similar to me.
- Wed Oct 19, 2016 10:16 am
- Forum: Quantum Numbers and The H-Atom
- Topic: 2.13 Homework Question [ENDORSED]
- Replies: 3
- Views: 658
Re: 2.13 Homework Question [ENDORSED]
Thank you!
- Tue Oct 18, 2016 12:01 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: 2.13 Homework Question [ENDORSED]
- Replies: 3
- Views: 658
2.13 Homework Question [ENDORSED]
2.13 Describe the orientation of the lobes of the px, py, and pz orbitals with respect to the cartesian axes.
- Wed Oct 12, 2016 9:21 pm
- Forum: Empirical & Molecular Formulas
- Topic: What is the molecular formula of xylitol?
- Replies: 2
- Views: 684
- Wed Oct 12, 2016 8:10 pm
- Forum: Empirical & Molecular Formulas
- Topic: What is the molecular formula of xylitol?
- Replies: 2
- Views: 684
What is the molecular formula of xylitol?
Xylitol, a sugar substitute, has a mass composition of C 39.43%, O 52.58%, H 7.88%, and a molar mass of 152.15 g/mol. What is its molecular formula? I found the moles for C, O, and H which are 3.283 mol C, 3.286 mol O, and 7.817 mol H. When I divided everything by 3.283, I got C: 1, H: 2.378, and O ...
- Wed Oct 12, 2016 6:48 pm
- Forum: Balancing Chemical Reactions
- Topic: Balanced Equation for combustion of CH3OH
- Replies: 1
- Views: 661
Balanced Equation for combustion of CH3OH
Write a balanced equation for the combustion of CH3OH.
Would the product of any combustion reaction have water and CO2?
Would the product of any combustion reaction have water and CO2?
- Mon Oct 10, 2016 8:39 pm
- Forum: Photoelectric Effect
- Topic: Post Module Questions
- Replies: 1
- Views: 332
Post Module Questions
1. In photoelectric experiments, typically what part of the electromagnetic spectrum is the incoming light? Is the answer ultraviolet? 2. Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 105 m.s-1. The work function for sodium is 150.6 kJ.mol-1. Calculate the ener...
- Mon Oct 10, 2016 1:42 pm
- Forum: Photoelectric Effect
- Topic: Given the kinetic energy, how do you find the energy? [ENDORSED]
- Replies: 4
- Views: 1239
Re: Given the kinetic energy, how do you find the energy? [ENDORSED]
Thank you! Your explanation was very clear.
- Mon Oct 10, 2016 1:18 pm
- Forum: Einstein Equation
- Topic: What is the difference between deltaE=hv and E=hv?
- Replies: 5
- Views: 7585
What is the difference between deltaE=hv and E=hv?
#10 in workbook: An excited hydrogen atom emits light with a frequency of 1.14 x 10^14 Hz to reach the energy level for which n=4. In what principle quantum level did the electron begin? The worked out solution uses the equation deltaE= hv to find energy. My confusion is how do I know when the equat...
- Thu Oct 06, 2016 3:27 pm
- Forum: Photoelectric Effect
- Topic: Given the kinetic energy, how do you find the energy? [ENDORSED]
- Replies: 4
- Views: 1239
Given the kinetic energy, how do you find the energy? [ENDORSED]
In a second experiment a shorter wavelength light source is used resulting in ejected electrons with a kinetic energy of 4.200 x 10-19J. What is the energy of this incident light? What is the wavelength of this incident light? What is the difference between the kinetic energy and just the energy of ...
- Thu Oct 06, 2016 2:52 pm
- Forum: Photoelectric Effect
- Topic: Module Questions
- Replies: 1
- Views: 342
Module Questions
When the energy per photon is equal to the energy required to remove an electron, what is this energy called? Is the answer threshold energy? Also, if long wavelength light is not ejecting electrons from a metal surface will increasing the intensity of the light result in electrons being ejected? Th...
- Wed Oct 05, 2016 1:27 pm
- Forum: Properties of Light
- Topic: 1.69 Homework Problem [ENDORSED]
- Replies: 2
- Views: 701
1.69 Homework Problem [ENDORSED]
1.69 : In a recent suspense film, two secret agents must penetrate a criminal's stronghold monitored by a lithium photomultiplier cell that is continually bathed in light from a laser. If the beam of light is broken, an alarm sounds. The agents want to use a handheld laser to illuminate the cell whi...
- Wed Oct 05, 2016 12:58 pm
- Forum: Einstein Equation
- Topic: 1.65 : Will visible light be able to break C-C bond? [ENDORSED]
- Replies: 1
- Views: 4505
1.65 : Will visible light be able to break C-C bond? [ENDORSED]
1.65 : The energy required to break a C-C bond in a molecule is 348 kJ/mol. Will visible light be able to break this bond? If yes, what is the color of the light? If not, what type of electromagnetic radiation will be suitable?
Also, how do I convert from kj/mol to just joules?
Thank you
Also, how do I convert from kj/mol to just joules?
Thank you
- Sun Oct 02, 2016 4:02 pm
- Forum: Properties of Light
- Topic: 1.57 : Wavelength of next line in series ?
- Replies: 1
- Views: 529
1.57 : Wavelength of next line in series ?
1.57 : Lines in the Balmer series of the hydrogen spectrum are observed at 656.3, 486.1, 434.0, and 410.2 nm. What is the wavelength of the next line in the series?
- Sun Oct 02, 2016 4:00 pm
- Forum: Properties of Light
- Topic: Self Test 1.5A: Calculating longest wavelength given work function [ENDORSED]
- Replies: 2
- Views: 1064
- Sun Oct 02, 2016 2:47 pm
- Forum: Properties of Light
- Topic: Self Test 1.5A: Calculating longest wavelength given work function [ENDORSED]
- Replies: 2
- Views: 1064
Self Test 1.5A: Calculating longest wavelength given work function [ENDORSED]
Question : Self Test 1.5 A in the textbook :
The work function of zinc is 363 eV. What is the longest wavelength of electromagnetic radiation that could electrons from zinc?
How do I solve this?
The work function of zinc is 363 eV. What is the longest wavelength of electromagnetic radiation that could electrons from zinc?
How do I solve this?
- Fri Sep 30, 2016 10:54 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Is the Periodic Sheet Allowed on Quizzes and Tests?
- Replies: 4
- Views: 549
Is the Periodic Sheet Allowed on Quizzes and Tests?
For quizzes, are we allowed to use the periodic table and formula sheet that came along with the course reader?
- Tue Sep 27, 2016 10:27 pm
- Forum: Balancing Chemical Reactions
- Topic: H.13 How To Write This Chemical Equation?
- Replies: 4
- Views: 2700
Re: H.13 How To Write This Chemical Equation?
Okay that makes sense. Thank you!
- Tue Sep 27, 2016 4:33 pm
- Forum: Empirical & Molecular Formulas
- Topic: L.39 Question: Empirical Formula of Oxide
- Replies: 3
- Views: 937
Re: L39 Question: Empirical Formula of Oxide
Thank you!
- Tue Sep 27, 2016 11:55 am
- Forum: Empirical & Molecular Formulas
- Topic: L.39 Question: Empirical Formula of Oxide
- Replies: 3
- Views: 937
L.39 Question: Empirical Formula of Oxide
L.39. A 1.50-g sample of metallic tin was placed in a 26.45-g crucible and heated until all the tin had reacted with the oxygen in air to form an oxide. The crucible and product together were found to weigh 28.35 g. a). What is the empirical formula of the oxide? b). Write the name of the oxide. I f...
- Mon Sep 26, 2016 5:24 pm
- Forum: Balancing Chemical Reactions
- Topic: H.13 How To Write This Chemical Equation?
- Replies: 4
- Views: 2700
Re: How To Write This Chemical Equation?
For some reason, my question was like that. Thank you for your help!
- Mon Sep 26, 2016 11:53 am
- Forum: Balancing Chemical Reactions
- Topic: H.13 How To Write This Chemical Equation?
- Replies: 4
- Views: 2700
H.13 How To Write This Chemical Equation?
H.13. When nitrogen and oxygen gases react in the hot exhaust environment of an automobile engine, nitric oxide gas, NO, is formed. After it escapes into the atmosphere with the other gas on a solution of sodium sulfide, Na2S, in alcohol, which, in turn, is made by the reaction of hydrogen sulfide g...