Search found 25 matches

by Ethan_Kato_1D
Sat Mar 18, 2017 11:26 pm
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Chapter 3 Question 7
Replies: 1
Views: 452

Chapter 3 Question 7

How do you know if the drawing is supposed to be eclipsed or staggered? Is it based on the dihedral angle? If so, how does that work?
by Ethan_Kato_1D
Sat Mar 18, 2017 9:27 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 903462

Re: Post All Chemistry Jokes Here

Gold strolls into a chemical bar. The bartender yells "Ay you! Get outta here!" (Get it, AU?)
by Ethan_Kato_1D
Sat Mar 18, 2017 9:25 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: When to use Isomers
Replies: 1
Views: 441

When to use Isomers

When do you need to use cis and trans naming?
by Ethan_Kato_1D
Tue Mar 07, 2017 6:55 pm
Forum: *Nucleophiles
Topic: Lone Pairs
Replies: 2
Views: 453

Lone Pairs

Any time there are lone pairs, does that make the compound a nucleophile?
by Ethan_Kato_1D
Tue Mar 07, 2017 6:26 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2017
Replies: 183
Views: 15496

Re: Quiz 3 Winter 2017

For number 5, how are there 2 intermediates?
by Ethan_Kato_1D
Tue Mar 07, 2017 6:00 pm
Forum: *Cycloalkanes
Topic: Multiple possible names
Replies: 2
Views: 250

Multiple possible names

When you are naming a cycloalkane, and you find multiple names possible, how do you determine which is best? Do you pick the name with overall lower numbers? Do you compare each number consecutively? Do you pick the name with the lowest first number (because it is based alphabetically)? Why does the...
by Ethan_Kato_1D
Tue Mar 07, 2017 5:56 pm
Forum: *Alkanes
Topic: Different Substituent Numbers
Replies: 1
Views: 214

Different Substituent Numbers

I am still confused when there are multiple possible names, which to select.
For example: 4-Ethyl-2,2-Dimethyl-hexane vs. 3-Ethyl-5,5-Dimethyl-Hexane. I know that the first name is correct, however how would you determine that? If it isn't by adding the total number, then what is it?
by Ethan_Kato_1D
Sun Mar 05, 2017 3:14 pm
Forum: *Nucleophilic Substitution
Topic: Bimolecular Nucleophilic Substitution Reaction
Replies: 3
Views: 591

Bimolecular Nucleophilic Substitution Reaction

How do you tell if the rate limiting step is a second order reaction, thus a bimolecular nucleophilic substitution reaction?
by Ethan_Kato_1D
Sun Feb 19, 2017 8:59 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 903462

Re: Post All Chemistry Jokes Here

Why do chemists like nitrates so much?

They are cost less than day rates!!!!
by Ethan_Kato_1D
Thu Feb 09, 2017 8:12 pm
Forum: Balancing Redox Reactions
Topic: Acidic and Basic Solutions
Replies: 2
Views: 239

Acidic and Basic Solutions

Why is it that when you add hydroxide to the reactant side of the half reaction, it is considered basic? Don't bases produce hydronium ions in solution?
by Ethan_Kato_1D
Fri Jan 27, 2017 11:19 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Chapter 9 Q43
Replies: 1
Views: 212

Chapter 9 Q43

The Answer in the solution manual states: "Assume no change in volume. To calculate the change in entropy for the hot and cold water, the amount of energy which flows from one to the other must first be calculated: q(c) = -q(h)." Why is that when there is no change in volume the heat of th...
by Ethan_Kato_1D
Thu Jan 19, 2017 10:15 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Problem Three Part A
Replies: 1
Views: 250

Problem Three Part A

8.3: Air in a bicycle pump is compressed by pushing in th ehandle. if the inner diameter of the pump is 3 cm and the pump is depressed 20 cm with a pressure of 2atm, (a) how much work is done in the compression? Why when finding the amount of work, Area times Distance is equal to the change of volum...
by Ethan_Kato_1D
Fri Jan 13, 2017 9:34 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Enthalpies of Formation Basics
Replies: 2
Views: 244

Standard Enthalpies of Formation Basics

I am confused about how to find the standard states of compounds and elements for standard Enthalpies of formation. How do you know what state to use for each element and compound?
by Ethan_Kato_1D
Fri Dec 02, 2016 10:49 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: Chapter 13 #5
Replies: 1
Views: 414

Chapter 13 #5

For a. What is the concentration of hydronium ions in a solution that is 0.075 M HCN (aq) and 0.060 M NaCN(aq)?

Why can you not use the Henderson-Hasselbalch equation to solve this? As opposed to 13.7?
by Ethan_Kato_1D
Fri Dec 02, 2016 9:10 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: Chapter 13 #7a
Replies: 2
Views: 478

Chapter 13 #7a

The question asks to determine the pH and pOH of a solution that is 0.50 M NaHSO4 and .25 Na2SO4. What is the chemical equation for this reaction? If there are two steps, what are the two steps?
by Ethan_Kato_1D
Sun Nov 27, 2016 2:13 pm
Forum: Identifying Acidic & Basic Salts
Topic: The effect of Cl- [ENDORSED]
Replies: 1
Views: 246

The effect of Cl- [ENDORSED]

When ammonium chloride mixes with water, why does the Cl- not affect the overall pH. Couldn't Cl- accept a proton and form HCl, therefore increasing the pH?
by Ethan_Kato_1D
Sun Nov 27, 2016 11:44 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Purpose of Acidity and Basicity Constants
Replies: 1
Views: 252

Purpose of Acidity and Basicity Constants

Besides being a mere convenience, what are the purposes of pKa and pKb. What do they show or mean?
by Ethan_Kato_1D
Thu Nov 17, 2016 10:03 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Stability [ENDORSED]
Replies: 1
Views: 174

Stability [ENDORSED]

Is a diamagnetic compound more stable than a paramagnetic compound? Does the charge affect the stability as well?
by Ethan_Kato_1D
Mon Nov 07, 2016 2:39 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: MO Setup
Replies: 1
Views: 150

MO Setup

To make a MO Diagram fro Li2 +, does it matter from which side/Li atom we take an electron from? Or can we take from either atom?
by Ethan_Kato_1D
Mon Nov 07, 2016 2:37 pm
Forum: Hybridization
Topic: Hybridization
Replies: 2
Views: 312

Hybridization

What is the Difference between Hybridized and unhybridized orbitals?
by Ethan_Kato_1D
Tue Oct 25, 2016 11:37 am
Forum: Octet Exceptions
Topic: Carbon as a radical
Replies: 1
Views: 355

Carbon as a radical

Does carbon exist more commonly as a radical rather than accepting a negative formal charge?
by Ethan_Kato_1D
Sun Oct 23, 2016 10:40 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 903462

Re: Post All Chemistry Jokes Here

Joke 1: Is silicon the same in Spanish?
Answer: Si

Joke 2: I blew up my chemistry experiment...
OXIDANTS HAPPEN

Joke 3: I think I've Lost an Electron... In fact I'm Positive
by Ethan_Kato_1D
Fri Oct 14, 2016 5:55 pm
Forum: Photoelectric Effect
Topic: Threshold Energy
Replies: 1
Views: 278

Threshold Energy

Hello !

Is it possible to have a negative threshold energy value?
by Ethan_Kato_1D
Tue Oct 04, 2016 1:09 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Chapter 1 Question #15 [ENDORSED]
Replies: 1
Views: 355

Chapter 1 Question #15 [ENDORSED]

1.15: In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6nm. 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. So I know the wavelength of the light is 102.6nm. I began solving thi...
by Ethan_Kato_1D
Wed Sep 28, 2016 6:20 pm
Forum: Limiting Reactant Calculations
Topic: Reaction Stoichiometry L 39 [ENDORSED]
Replies: 1
Views: 380

Reaction Stoichiometry L 39 [ENDORSED]

Hi! The following question is not under the limiting reactant section, but is rather under "L- Reaction Stoichiometry". 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 ...

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