Search found 26 matches

by Madeline_Foo_3J
Fri Mar 17, 2017 2:30 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Practice Problems
Replies: 16
Views: 1879

Re: Practice Problems

Here are solutions. Another problem set will be posted shortly. Problem_Set_01_Conformations_Solutions_01.pdf Problem_Set_01_Conformations_Solutions_02.jpeg for the third figure I understand why CH(CH3)2 needs to be anti to have the lowest energy, but if the two H atoms are on the same side rather ...
by Madeline_Foo_3J
Fri Mar 17, 2017 10:07 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 2016 final question 3B
Replies: 4
Views: 358

Re: 2016 final question 3B

Ryan Doyle 3E wrote:The Cathode is always going to have the higher reduction half reaction value to make the total cell potential as high as possible because we calculate that through the equation Cathode potential - Anode Potential


when you say higher reduction half reaction do you mean more positive?
by Madeline_Foo_3J
Sun Mar 12, 2017 8:15 pm
Forum: *Organic Reaction Mechanisms in General
Topic: 2013 Final question 5C [ENDORSED]
Replies: 1
Views: 319

2013 Final question 5C [ENDORSED]

I'm confused as to why it says this reaction is a SN2 reaction when the two molecules are being added together?
by Madeline_Foo_3J
Sun Mar 12, 2017 1:36 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: p.15 Organic Textbook geometric isomer
Replies: 3
Views: 324

Re: p.15 Organic Textbook geometric isomer

I think it's because a geometric isomer has the same connectivity as well as molecular formula. If you look at 2-Methyl-1-propene, the C atom on the right of the double bond does not have an H connected to it like 1-Butene does. I don't know if this is right but I think that makes the hybridization ...
by Madeline_Foo_3J
Mon Mar 06, 2017 5:22 pm
Forum: *Electrophiles
Topic: Identifying the nucleophile or electrophile
Replies: 2
Views: 539

Re: Identifying the nucleophile or electrophile

I think it depends on the shape of the molecule?
by Madeline_Foo_3J
Mon Feb 13, 2017 8:56 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Winter 2013 Midterm Q2A
Replies: 10
Views: 767

Re: Winter 2013 Midterm Q2A

For part C why should we add less ice ?
by Madeline_Foo_3J
Mon Feb 13, 2017 3:02 pm
Forum: Balancing Redox Reactions
Topic: 2016 Midterm #8A
Replies: 3
Views: 347

Re: 2016 Midterm #8A

Why did they add the two values together in this problem? I thought Enot was solved by E(cathode)-E(anode) ?
by Madeline_Foo_3J
Mon Feb 13, 2017 1:07 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: midterm 2015 Q7
Replies: 3
Views: 358

midterm 2015 Q7

I was wondering why Al3+ at 2.0M would be the cathode? Does a higher concentration always mean it will be the cathode?

Thanks!
by Madeline_Foo_3J
Sat Feb 11, 2017 2:01 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: 14.33
Replies: 3
Views: 374

14.33

Can someone explain part B to me? What does it mean if an element will disproportionate in aqueous solution ?
by Madeline_Foo_3J
Wed Feb 08, 2017 3:02 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Problem 14.25
Replies: 3
Views: 305

Re: Problem 14.25

Is the reason why Cr is the strongest reducing agent because you have to flip the sign of its standard potential to make it a reducing agent?
by Madeline_Foo_3J
Mon Feb 06, 2017 3:07 pm
Forum: Balancing Redox Reactions
Topic: Chapter 14 Question 3
Replies: 7
Views: 661

Re: Chapter 14 Question 3

Why does the solution manual give S2O3(2-) 8 electrons when balancing the equation? I thought the Sulfur went from a 2+ to a 6+?
by Madeline_Foo_3J
Sun Jan 29, 2017 9:18 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: HW 9.75
Replies: 1
Views: 234

Re: HW 9.75

I think it depends on the number of atoms the molecule has?
by Madeline_Foo_3J
Fri Jan 20, 2017 4:25 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 8.31 clarification
Replies: 1
Views: 301

8.31 clarification

Hey for problem 8.31 I was wondering how they got 20.8 instead of 2.078 in the solutions manual?
Also what equation are they using to solve this question?
by Madeline_Foo_3J
Sun Jan 15, 2017 3:57 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Chapter 8 #65
Replies: 5
Views: 603

Re: Chapter 8 #65

How would you have known to half the second equation ?
by Madeline_Foo_3J
Sat Dec 03, 2016 12:38 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Final 2015 Q2A
Replies: 1
Views: 395

Final 2015 Q2A

What is considered an empirical relationship and what is a theoretical relationship? and why is the Bohr equation referred to as an empirical relationship?
Thanks!
by Madeline_Foo_3J
Sat Dec 03, 2016 12:35 pm
Forum: Hybridization
Topic: 2014 Final
Replies: 1
Views: 227

Re: 2014 Final

Oxygen and Nitrogen both have two lone pairs. Remember when you do hybridization you have to include lone pairs so since Nitrogen has 3 bonds and one lone pair it's hybridization is sp3 and since oxygen has 2 lone pairs and two bonds, making it sp3 hybridization.
by Madeline_Foo_3J
Thu Dec 01, 2016 8:37 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: 3.17
Replies: 1
Views: 260

3.17

I have a question on part c and d because I'm not sure where they got these Pka values..
by Madeline_Foo_3J
Thu Nov 24, 2016 10:48 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Chapter 11 Q 89
Replies: 3
Views: 467

Re: Chapter 11 Q 89

So basically for this problem we just had to look at the values on the vertical axis and turn them into a ratio?
by Madeline_Foo_3J
Sun Nov 20, 2016 1:04 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: 11.45 part C
Replies: 1
Views: 274

11.45 part C

Part c is asking which is thermodynamically unstable and the manual says cl2 is more stable but I'm not entirely sure why...can someone explain??
by Madeline_Foo_3J
Fri Nov 11, 2016 5:54 pm
Forum: Naming
Topic: 17.35
Replies: 2
Views: 421

17.35

Which of the following isomers of disminobenzene can form chelating complexes? Explain.

I don't really understand what a chelating complex is
by Madeline_Foo_3J
Sun Nov 06, 2016 2:46 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Questions 4.77
Replies: 2
Views: 270

Questions 4.77

A) draw the bonding and antibonding orbitals that correspond to the sig-bond in H2
B) repeat for HF
C) how do the orbitals differ?

The manual kind of just confused me...
by Madeline_Foo_3J
Sun Nov 06, 2016 2:04 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Problem 4.67
Replies: 1
Views: 290

Problem 4.67

Based on their valence-shell electron configurations, which of the following species would you expect to have the lowest ionization energy: a) C2+ b) C2 c) C2- Im confused as to why the manual it put down the (pi 2 p) before the (sig 2 p) for c2 and C2- when they have more than 8 valence electrons ?
by Madeline_Foo_3J
Mon Oct 24, 2016 10:59 pm
Forum: Lewis Structures
Topic: Homework #3.97
Replies: 2
Views: 289

Re: Homework #3.97

^ how would you know when to do a lewis structure like that?
by Madeline_Foo_3J
Mon Oct 17, 2016 2:38 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Chapter 2 HW: #39 [ENDORSED]
Replies: 7
Views: 1464

Re: Chapter 2 HW: #39 [ENDORSED]

I understand why a) b) and c) are all wrong, but I'm confused about why the question asked if the configuration represents the ground state or the excited state when a) b) and c) don't follow Hund's rule?
by Madeline_Foo_3J
Sat Oct 08, 2016 9:17 pm
Forum: Photoelectric Effect
Topic: problem 1.69
Replies: 1
Views: 242

problem 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 while they...
by Madeline_Foo_3J
Thu Sep 29, 2016 10:35 am
Forum: Molarity, Solutions, Dilutions
Topic: L.39
Replies: 1
Views: 239

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 28.35g. a) what is the empirical formula of the oxide? b) write the name of the oxide I just want t...

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