Search found 23 matches

by Casey Collet 1I
Fri Mar 06, 2015 5:51 pm
Forum: *Cycloalkanes
Topic: 1.17 Naming a substituted cyclohexane
Replies: 2
Views: 471

Re: 1.17

You would think that the first substituent would get the lowest number, however, we actually number by what gives the second substituent the lowest number when multiple substituents are present. So it is the first occurrence of a substituent (aka the second substituent) that you pay attention to whe...
by Casey Collet 1I
Fri Mar 06, 2015 5:45 pm
Forum: *Cycloalkanes
Topic: Neo vs. tert
Replies: 6
Views: 744

Neo vs. tert

For problem number 1.17, would it be wrong to use the common name "neo" instead of using "tert"? Would one be preferred over the other or does the common name neo not even work for this example?
by Casey Collet 1I
Wed Mar 04, 2015 6:49 pm
Forum: *Cycloalkanes
Topic: Having a cylcoalkane as a substituent
Replies: 3
Views: 663

Having a cylcoalkane as a substituent

For this structure found on page 24 of the Introduction to Organic Chemistry book, I'm having a hard time understanding why you name this structure the way you do. It says that cyclopropyl is the substituent that is attached to carbon atom number two of pentane, but if you consider that the second c...
by Casey Collet 1I
Tue Feb 24, 2015 11:01 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Leaving reaction intermediates in final equations
Replies: 1
Views: 397

Leaving reaction intermediates in final equations

I'm slightly confused about the way solutions manual used the pre-equilibrium approach for problem 14.105 part b. It uses it to replace the concentration of the reaction intermediate HOCl, but it leaves OH-, which is also a reaction intermediate. Why are we allowed to leave OH- in the equation and w...
by Casey Collet 1I
Sun Feb 22, 2015 5:59 pm
Forum: First Order Reactions
Topic: When given t_1/2
Replies: 1
Views: 423

When given t_1/2

If on a test we were given the half life of a first order reaction and asked to find the time needed for the concentration to decrease and the time given is not a multiple of one half in terms of integers, could we use (1/2)^n=time given and find n using natural logs? For example, problem 14.27 part...
by Casey Collet 1I
Thu Feb 19, 2015 10:26 am
Forum: General Rate Laws
Topic: To use mmol or not
Replies: 2
Views: 529

To use mmol or not

When finding rate laws and rate constants that usually have mmol in the units, do we always want to convert? In the textbook, it doesn't convert mmol in problem 14.17, but does convert them in problem 14.19.
by Casey Collet 1I
Mon Feb 09, 2015 6:45 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Platinum in cell diagrams
Replies: 4
Views: 791

Re: Platinum in cell diagrams

Okay that's what I thought, but then why on problem 13.21 part a does the cell diagram for the anode look like Hg(l) l Hg2^(2+) (aq), where there isn't a solid present, but it indicates that mercury is acting as the electrode?
by Casey Collet 1I
Mon Feb 09, 2015 5:05 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Platinum in cell diagrams
Replies: 4
Views: 791

Platinum in cell diagrams

I keep getting confused on the conditions in which you use Platinum as an inert conductor in cell diagrams. If a metal is present, but is liquid instead of solid, can that metal still act as the electrode? Is it only with gases and nonmetals that platinum must be present?
by Casey Collet 1I
Mon Feb 09, 2015 4:38 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: When to include OH- and H2O in cell diagrams
Replies: 1
Views: 370

When to include OH- and H2O in cell diagrams

When writing a cell diagram for a galvanic cell, are we supposed to leave out H2O and OH- if they are not constituting the entire reaction? Both 13.15 part c and 13.17 part b left these two compounds out of the diagram.
by Casey Collet 1I
Wed Feb 04, 2015 11:53 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Concentration cell anodes and cathodes
Replies: 1
Views: 4692

Concentration cell anodes and cathodes

Why is it that for the concentration cell that we looked at in class on Monday, the solution with the lower concentration would be considered the anode and the solution with the higher concentration would be considered the cathode? Does it have something to do with the increase in concentration that...
by Casey Collet 1I
Mon Jan 26, 2015 10:28 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Number of bonds and entropy
Replies: 1
Views: 3974

Number of bonds and entropy

Does the number of bonds (such as a single, double, or triple bond) between molecules relate to either an increase or decrease in entropy such that when comparing two molecules you would be able to tell if one has higher or lower entropy based on the number of bonds? We talked last quarter about how...
by Casey Collet 1I
Sat Jan 24, 2015 4:43 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Appropriate equation for standard enthalpy of formation
Replies: 1
Views: 377

Appropriate equation for standard enthalpy of formation

When a question asks for the standard enthalpy of formation of a compound, how do you know what equation that you want to analyze for the reaction? For example, in homework problem 7.71, the solutions manual says that we want the equation N2+(5/2)O2->N2O5, but that is not a given reaction. By lookin...
by Casey Collet 1I
Mon Dec 08, 2014 1:58 am
Forum: Bronsted Acids & Bases
Topic: Shift from AlCl3 to Al(H2O)6
Replies: 1
Views: 732

Shift from AlCl3 to Al(H2O)6

A few of the problems in the chapter 11 homework change a compound such as AlCl3 to Al(H2O)6 when writing out the reaction. Why do these problems do this and how are we supposed to know when/how to make this change in the formula?
by Casey Collet 1I
Sun Dec 07, 2014 12:57 am
Forum: Bronsted Acids & Bases
Topic: Comparing strengths of acids
Replies: 1
Views: 456

Comparing strengths of acids

When comparing the strength of weak acids, it is supposed to be that the more electronegative the compound, the stronger the acid. However, acids also get stronger as the bonds get weaker, so that acids get stronger moving down a period. For example, on problem #53 in chapter 11, it says that HCl>HF...
by Casey Collet 1I
Sat Dec 06, 2014 3:43 pm
Forum: Bronsted Acids & Bases
Topic: Placement of Hydrogen on the Compound
Replies: 1
Views: 337

Placement of Hydrogen on the Compound

The book says that when a hydrogen is on the end of a compound, it usually means that that compound is a base, but then it says sometimes, such as with COOH, having a hydrogen on the end indicates that the compound is acidic. How can you tell the difference between acids and bases with a hydrogen on...
by Casey Collet 1I
Mon Dec 01, 2014 5:41 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: From K to Kc
Replies: 1
Views: 347

From K to Kc

When converting from K to Kc, the equation raises RT to the power of ∆n. Would you include the moles of non-gas reactants/products when solving for the change of n?
by Casey Collet 1I
Sat Nov 29, 2014 4:22 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Homework #69
Replies: 1
Views: 346

Homework #69

In homework #69, I understand that the fact that the equilibrium constant is so small allows the reaction to strongly favor the reactants, but when doing similar problems how do we know that we are able to adjust the initial conditions according to the equilibrium constant?
by Casey Collet 1I
Thu Nov 27, 2014 3:25 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Composition
Replies: 1
Views: 267

Equilibrium Composition

I'm having a hard time conceptually understanding why when you calculate the equilibrium composition the can product have a smaller value of moles than the moles required for the reactants to produce the reaction? Is it just the way in which the chemicals are bonding?
by Casey Collet 1I
Mon Nov 03, 2014 4:10 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Electronegativity and Bond Angles
Replies: 1
Views: 829

Electronegativity and Bond Angles

In class, Lavelle talked about how the electronegativity of atoms involved in a chemical bond can influence the angles at which the bonds form in the VESPR models; however, the solutions in the book only adjusted bond angle's according to the presence of lone pairs. For the quiz, should we only pay ...
by Casey Collet 1I
Sun Nov 02, 2014 3:58 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Linear structure for VESPR models
Replies: 2
Views: 479

Linear structure for VESPR models

If VESPR formula for a molecule is AX_2E_3, such as with I_3^-, why would the VESPR model be linear if there are 3 lone pair bonds on the central atom?
by Casey Collet 1I
Tue Oct 28, 2014 10:32 pm
Forum: Ionic & Covalent Bonds
Topic: Hydrogen and Covalent Bonds
Replies: 1
Views: 326

Hydrogen and Covalent Bonds

If covalent bonds are typically formed between only nonmetals, why does it seem that hydrogen is in so many covalent bonds?
by Casey Collet 1I
Sat Oct 25, 2014 12:49 am
Forum: Lewis Structures
Topic: Valence electrons and bonds
Replies: 3
Views: 9459

Valence electrons and bonds

Why is it that in the Lewis structure for sulfate, sulfur has 6 valence electrons but there aren't six electrons directly around the atom, but rather four bonds? Does that mean that sulfur gave up two of it's valence electrons to two of the oxygen atoms?
by Casey Collet 1I
Thu Oct 16, 2014 5:16 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Absorption/emission spectroscopy
Replies: 1
Views: 390

Absorption/emission spectroscopy

Are atomic absorption spectroscopy and atomic emission spectroscopy two different things or are the same? What about absorption line spectrum and the emission line spectrum?

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