Search found 21 matches
- Fri Mar 17, 2017 11:59 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: final 2014 Question 2
- Replies: 1
- Views: 340
final 2014 Question 2
What gives us the ability to predict that Delta s of the system is negative?
- Sat Mar 11, 2017 11:49 pm
- Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
- Topic: Eclipsed and staggered
- Replies: 1
- Views: 442
Eclipsed and staggered
Hi!
I was wondering if molecules tried to return to staggered position once they are in eclipsed position since it is a lower energy state or if they stay in a position until another molecule collides with them?
Thank you!
I was wondering if molecules tried to return to staggered position once they are in eclipsed position since it is a lower energy state or if they stay in a position until another molecule collides with them?
Thank you!
- Fri Mar 03, 2017 11:30 pm
- Forum: *Nucleophiles
- Topic: Self-Test 4.1A
- Replies: 1
- Views: 418
Self-Test 4.1A
Hi!
I was wondering why I- is more nucleophilic than Cl- as stated on page 147 in the Organic chem book. It says that it is because of polarzability but I was wondering if someone could explain it in detail. I thought that since Iodine is a smaller atom it would act more nucleophilic.
Thank you!
I was wondering why I- is more nucleophilic than Cl- as stated on page 147 in the Organic chem book. It says that it is because of polarzability but I was wondering if someone could explain it in detail. I thought that since Iodine is a smaller atom it would act more nucleophilic.
Thank you!
- Sat Feb 25, 2017 3:58 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: 15.89 [ENDORSED]
- Replies: 1
- Views: 359
15.89 [ENDORSED]
Hi!
In general,How do you figure out which step is the rate determining one?
In general,How do you figure out which step is the rate determining one?
- Sat Feb 18, 2017 11:31 pm
- Forum: General Rate Laws
- Topic: Quiz 2 preparation #2
- Replies: 2
- Views: 521
Quiz 2 preparation #2
Hi!
I had a question about number 2 on quiz 2 prep.
What is the difference between reaction rate and rate constant?
Thank you!
I had a question about number 2 on quiz 2 prep.
What is the difference between reaction rate and rate constant?
Thank you!
- Sat Feb 11, 2017 11:57 pm
- Forum: Balancing Redox Reactions
- Topic: Question 14.25
- Replies: 2
- Views: 485
Question 14.25
Hi! I had a question on 14.25 Arrange the following metals in order of increasing strength as reducing agents for species in aqueous solution: (a) Cu, Zn, Cr, Fe; For (a) why is the answer Cu <Fe < Zn < Cr? Isn't Zn the most electronegative,which would make it grab electrons at a higher strength tha...
- Fri Feb 03, 2017 1:59 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: 9.43
- Replies: 2
- Views: 634
9.43
Hello! 9.43 Suppose that 50.0 g of H 2 O(l) at 20.0 $C is mixed with 65.0 g of H 2 O(l) at 50.0 C at constant atmospheric pressure in a thermally insulated vessel. Calculate "S and "S tot for the process What equation for S am I supposed to use and how do I mathematically connect the diffe...
- Wed Jan 25, 2017 10:45 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Gibbs Free Energy Questions
- Replies: 1
- Views: 379
Gibbs Free Energy Questions
Hello,
What is free energy and how is it a state function? Also, how are entropy and enthalpy related to free energy?
What is free energy and how is it a state function? Also, how are entropy and enthalpy related to free energy?
- Sat Jan 21, 2017 11:05 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Bond Enthalpy vs Enthalpy of formation [ENDORSED]
- Replies: 1
- Views: 438
Bond Enthalpy vs Enthalpy of formation [ENDORSED]
Hello,
What is the difference between bond enthalpies and enthalpy of formation?
What is the difference between bond enthalpies and enthalpy of formation?
- Fri Jan 13, 2017 2:16 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chapter 8 problem 31 question
- Replies: 2
- Views: 488
Chapter 8 problem 31 question
8.31 Calculate the heat released by 5.025 g of Kr(g) at
0.400 atm as it cools from 97.6 ’C to 25.0 ’C at (a) constant
pressure and (b) constant volume. Assume that krypton behaves
as an ideal gas
What equation should I be using?
0.400 atm as it cools from 97.6 ’C to 25.0 ’C at (a) constant
pressure and (b) constant volume. Assume that krypton behaves
as an ideal gas
What equation should I be using?
- Fri Dec 02, 2016 8:57 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Chapter 12 problem 79
- Replies: 2
- Views: 920
Chapter 12 problem 79
12.79
Calculate the pH of 0.15 m H 2 SO 4 (aq) at 25 C.
Calculate the pH of 0.15 m H 2 SO 4 (aq) at 25 C.
- Thu Dec 01, 2016 4:22 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Chapter 12 question 27
- Replies: 2
- Views: 2247
Chapter 12 question 27
A careless laboratory technician wants to prepare
200.0 mL of a 0.025 m HCl(aq) solution, but uses a 250.0-mL
volumetric fl ask by mistake. (a) What would the pH of the
desired solution have been? (b) What will be the actual pH of
the solution as prepared?
200.0 mL of a 0.025 m HCl(aq) solution, but uses a 250.0-mL
volumetric fl ask by mistake. (a) What would the pH of the
desired solution have been? (b) What will be the actual pH of
the solution as prepared?
- Tue Nov 22, 2016 11:54 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Chapter 11 problem 115
- Replies: 1
- Views: 478
Chapter 11 problem 115
11.115 The overall photosynthesis reaction is 6 CO 2 (g) ! 6 H 2 O(l) S C 6 H 12 O 6 (aq) ! 6 O 2 (g), and ’H# " !2802 kJ. Suppose that the reaction is at equilibrium. State the effect that each of the following changes will have on the equilibrium composition (tends to shift toward the formati...
- Sun Nov 13, 2016 1:39 pm
- Forum: Photoelectric Effect
- Topic: Midterm question #3A
- Replies: 2
- Views: 632
Midterm question #3A
Why do we have to divide the threshold energy by Avogadro’s constant?
- Tue Nov 08, 2016 3:33 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Chemical Equilibrium [ENDORSED]
- Replies: 1
- Views: 397
Chemical Equilibrium [ENDORSED]
What has to happen to a reaction for it to reach chemical equilibrium? Are all reactions capable of being reversed?
- Fri Nov 04, 2016 4:10 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Molecular orbital theory question
- Replies: 2
- Views: 501
Molecular orbital theory question
What is the difference between an anti-molecular orbital and a bonding one? Additionally, why do electrons fill up the bonding orbitals first?
- Mon Oct 24, 2016 9:00 pm
- Forum: Electronegativity
- Topic: Electron affinity vs Electronegativity vs. Ionization energy [ENDORSED]
- Replies: 2
- Views: 2773
Electron affinity vs Electronegativity vs. Ionization energy [ENDORSED]
What is the difference between electron affinity, electronegativity, and ionization energy?
Thank you
Thank you
- Tue Oct 18, 2016 2:25 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: 2.55
- Replies: 3
- Views: 1211
2.55
Give the notation for the valence-shell configuration
(including the outermost d-electrons) of (a) the alkali metals;
(b) Group 15 elements; (c) Group 5 transition metals;
(d) “coinage” metals (Cu, Ag, Au)
(including the outermost d-electrons) of (a) the alkali metals;
(b) Group 15 elements; (c) Group 5 transition metals;
(d) “coinage” metals (Cu, Ag, Au)
- Sat Oct 15, 2016 7:10 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Chapter 1 question 15
- Replies: 4
- Views: 952
Chapter 1 question 15
In the ultraviolet spectrum of atomic hydrogen, a line is
observed at 102.6 nm. Determine the values of n for the initial
and final energy levels of the electron during the emission of
energy that leads to this spectral line.
observed at 102.6 nm. Determine the values of n for the initial
and final energy levels of the electron during the emission of
energy that leads to this spectral line.
- Sat Oct 08, 2016 8:46 pm
- Forum: Photoelectric Effect
- Topic: Quiz Preparation #5 [ENDORSED]
- Replies: 1
- Views: 436
Quiz Preparation #5 [ENDORSED]
The question is:
No electrons are emitted from the surface of metallic Cs until frequency of the radiation reaches 4.50x10^16 Hz. Find the energy required to remove the electron from the metal surface.
What am I supposed to use for kinetic energy?
No electrons are emitted from the surface of metallic Cs until frequency of the radiation reaches 4.50x10^16 Hz. Find the energy required to remove the electron from the metal surface.
What am I supposed to use for kinetic energy?
- Mon Sep 26, 2016 10:05 pm
- Forum: Properties of Light
- Topic: Magnetic and Electric fields
- Replies: 4
- Views: 719
Magnetic and Electric fields
How do magnetic fields and electric fields relate to each other? I know the diagram has them perpendicular to each other but what does that mean in relation to light?