Search found 37 matches

by KarenaKaing_1D
Mon Mar 07, 2016 4:50 pm
Forum: *Amines
Topic: Amines
Replies: 1
Views: 659

Amines

In the intro to organic chemistry textbook, on page 82 for the examples provided, what is the difference between N,N and N? How do you know when to include them in the name?
by KarenaKaing_1D
Tue Mar 01, 2016 9:31 pm
Forum: *Identifying Primary, Secondary, Tertiary, Quaternary Carbons, Hydrogens, Nitrogens
Topic: Quiz 3 Prep
Replies: 2
Views: 452

Quiz 3 Prep

For #5 on page 43, why is it 3-bromo-1-iodocyclohexane instead of 1-bromo-3-iodocyclohexane?
by KarenaKaing_1D
Tue Mar 01, 2016 8:53 pm
Forum: *Identifying Primary, Secondary, Tertiary, Quaternary Carbons, Hydrogens, Nitrogens
Topic: Naming
Replies: 1
Views: 292

Naming

For #2 on quiz 3 preparation, why does the compound name begin with trimethyl instead of ethyl? Shouldn't ethyl be first because tri- isn't part of alphabetizing the compound?
by KarenaKaing_1D
Tue Mar 01, 2016 6:10 pm
Forum: *Free Energy of Activation vs Activation Energy
Topic: Activation Energy
Replies: 1
Views: 322

Activation Energy

How do you know if a reaction will occur at room temperature given the activation energy? This question is 4.30 in the organic textbook.
by KarenaKaing_1D
Tue Mar 01, 2016 4:24 pm
Forum: *Nucleophiles
Topic: Identifying
Replies: 2
Views: 495

Identifying

How do you know if an element is a nucleophile or electrophile if there is no positive or negative charge on it? For example, would F be a nucleophile or electrophile?
by KarenaKaing_1D
Tue Mar 01, 2016 1:10 am
Forum: *Identifying Primary, Secondary, Tertiary, Quaternary Carbons, Hydrogens, Nitrogens
Topic: Secondary Carbons
Replies: 1
Views: 332

Secondary Carbons

Can someone explain again what a secondary carbon looks like?
by KarenaKaing_1D
Fri Feb 19, 2016 12:21 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Pre-Equilibrium Approach
Replies: 1
Views: 358

Pre-Equilibrium Approach

Can someone explain to me what step 2 is in the approach after treating the first step as equilibrium?
by KarenaKaing_1D
Mon Feb 08, 2016 11:16 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Galvanic Cells
Replies: 1
Views: 217

Galvanic Cells

What's the difference between galvanic and concentration cells?
by KarenaKaing_1D
Mon Feb 08, 2016 11:12 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Concentration cells
Replies: 1
Views: 262

Concentration cells

What are the characteristics of concentration cells and how can you tell you have a concentration cell from the problem?
by KarenaKaing_1D
Mon Feb 08, 2016 12:23 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams
Replies: 1
Views: 277

Cell Diagrams

When the equation does not contain a solid and it asks you to draw the cell diagram, does it matter which solid you add? Whether that be platinum, etc...
by KarenaKaing_1D
Thu Feb 04, 2016 10:42 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Drawing Cell Diagrams
Replies: 1
Views: 287

Drawing Cell Diagrams

How do we know when to draw the cell diagrams with the l and ll notation or the galvanic cell diagram showing the illustration of the salt bridge, volt meter, etc.?
by KarenaKaing_1D
Wed Feb 03, 2016 9:54 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Galvanic Cell
Replies: 1
Views: 246

Galvanic Cell

How does a galvanic cell work and what is its significance?
by KarenaKaing_1D
Tue Feb 02, 2016 11:14 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Anodes/Cathodes
Replies: 1
Views: 248

Anodes/Cathodes

Can someone explain to me the concept behind why cathodes are on the right whereas anodes are on the left?
by KarenaKaing_1D
Tue Feb 02, 2016 5:34 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Standard form
Replies: 1
Views: 255

Standard form

When calculating gibbs free energy, do you take into account the stable form, which would made it equal to 0? Or is that only for enthalpy?
by KarenaKaing_1D
Tue Feb 02, 2016 5:00 pm
Forum: Balancing Redox Reactions
Topic: Balancing Cell Reactions
Replies: 1
Views: 229

Balancing Cell Reactions

Can someone explain to me when you would have to reverse a half reaction and why do you reverse it?
by KarenaKaing_1D
Sun Jan 31, 2016 9:46 pm
Forum: Van't Hoff Equation
Topic: Van't Hoff Equation
Replies: 1
Views: 410

Van't Hoff Equation

In Lavelle's course reader when he derives the Van't Hoff equation that can be used to calculate K at different temperatures, he subtracts ln K2 from ln K1. Shouldn't the final result be ln K1 divided by ln K2 instead of ln K2 divided by ln K1?
by KarenaKaing_1D
Mon Jan 25, 2016 6:37 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Calculating Reaction Enthalpy
Replies: 1
Views: 282

Calculating Reaction Enthalpy

I noticed for some questions on past quizzes that ask to calculate the reaction enthalpy that some of the enthalpies of compounds are not given on the equation/formula sheet. Is there another way to calculate the enthalpy?
by KarenaKaing_1D
Sat Jan 23, 2016 8:31 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: 8.77
Replies: 1
Views: 296

8.77

What is benzene? And what are the Kekule structures?
by KarenaKaing_1D
Fri Jan 22, 2016 7:53 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Linear VS Nonlinear
Replies: 1
Views: 302

Linear VS Nonlinear

How do we figure out if a molecule is linear or nonlinear when seeing which expression to use for the heat capacity of constant pressure/volume?
by KarenaKaing_1D
Tue Jan 19, 2016 10:10 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Thermodynamics
Replies: 1
Views: 224

Thermodynamics

In Lavelle's course reader, he writes that thermodynamics is initial and final states of reaction (time independent). What does he mean by time independent? And before that, he writes how kinetics is the pathway of reaction (time dependent). What does he mean by time dependent?
by KarenaKaing_1D
Thu Jan 14, 2016 10:43 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Change in H is equal to Q
Replies: 1
Views: 289

Change in H is equal to Q

On page 253 of the textbook, it states, "At constant pressure, and with no nonexpansion work: change in H is equal to q." Where did that equation come from?
by KarenaKaing_1D
Thu Jan 14, 2016 2:45 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Enthalpy of Formation
Replies: 1
Views: 308

Standard Enthalpy of Formation

Lavelle writes in his course reader that the standard enthalpy of formation of an element in its most stable form is zero. He also mentions later in the example that oxygen gas is in its most stable form. How do you know if an element is in its stable form or not?
by KarenaKaing_1D
Wed Jan 13, 2016 8:45 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Work
Replies: 4
Views: 757

Work

Work is equal to -PV. Can someone clarify why there is a negative sign please? Lavelle went over it during lecture.
by KarenaKaing_1D
Wed Jan 13, 2016 8:38 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Thermodynamics vs thermochemistry
Replies: 1
Views: 376

Thermodynamics vs thermochemistry

What is the difference between the two?
by KarenaKaing_1D
Fri Jan 08, 2016 12:27 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's Law
Replies: 2
Views: 584

Hess's Law

In Lavelle's course reader, he states enthalpy changes are additive, which is Hess's Law. What exactly does that mean? And what are state functions?
by KarenaKaing_1D
Thu Dec 03, 2015 10:05 am
Forum: *Titrations & Titration Calculations
Topic: Titrations
Replies: 2
Views: 465

Titrations

What are the different types of titration problems and how would you go about in solving them?
by KarenaKaing_1D
Fri Nov 27, 2015 1:16 am
Forum: Bronsted Acids & Bases
Topic: How to determine if compound is bronsted acid/based
Replies: 1
Views: 235

How to determine if compound is bronsted acid/based

If only the compound is given, how do you know if it is a bronsted acid or base? Are those compounds just something you memorize? If so, is there an easy way to memorize them?
by KarenaKaing_1D
Wed Nov 18, 2015 5:29 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: How to find if you -x or +x for ICE
Replies: 1
Views: 292

How to find if you -x or +x for ICE

How do you know if you -x or +x for a problem that requires the ICE table? For instance, what if the problem does not have enough information to see if you can compare Q to K.
by KarenaKaing_1D
Mon Nov 16, 2015 11:16 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Table
Replies: 1
Views: 196

ICE Table

What problems require the use of an ICE table instead of just using the equilibrium constant equation?
by KarenaKaing_1D
Mon Nov 09, 2015 8:58 pm
Forum: Naming
Topic: Cations and Anions
Replies: 1
Views: 409

Cations and Anions

Where are they located on the periodic table?
by KarenaKaing_1D
Wed Nov 04, 2015 1:56 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar vs nonpolar
Replies: 3
Views: 507

Polar vs nonpolar

Are there any general rules to tell if a structure is polar or nonpolar? For instance, trigonal planar molecules are nonpolar if all three molecules are the same.
by KarenaKaing_1D
Sat Oct 31, 2015 11:20 am
Forum: Sigma & Pi Bonds
Topic: Paramagnetic
Replies: 1
Views: 417

Paramagnetic

Can someone explain 4.63, which asks if they are paramagnetic, how many unpaired electrons does it possess? How does B2- have only one unpaired electron?
by KarenaKaing_1D
Tue Oct 27, 2015 11:51 am
Forum: Bond Lengths & Energies
Topic: acids and bases
Replies: 2
Views: 434

Re: acids and bases

BASES donate a proton while ACIDS accept a proton
by KarenaKaing_1D
Fri Oct 23, 2015 4:34 pm
Forum: Ionic & Covalent Bonds
Topic: How to tell from whether it is covalent or ionic
Replies: 3
Views: 605

Re: How to tell from whether it is covalent or ionic

You can also find the electronegativity difference of two atoms. If the difference is >2, it is an ionic bond. If the difference is <1.5, it is a covalent bond.
by KarenaKaing_1D
Fri Oct 23, 2015 4:34 pm
Forum: Ionic & Covalent Bonds
Topic: Bridging bonds
Replies: 1
Views: 289

Bridging bonds

Lavelle's course readers says, "Halogens often form bridging bonds." What exactly are they?
by KarenaKaing_1D
Sat Oct 17, 2015 4:42 pm
Forum: Ionic & Covalent Bonds
Topic: Types of Bonds
Replies: 4
Views: 603

Types of Bonds

How do you know what type of bond an element has? For instance, why does Flourine have only a single bond with 6 electrons outside in its Lewis structure? Why can't it have a double bond with 4 electrons outside?
by KarenaKaing_1D
Thu Oct 08, 2015 11:05 pm
Forum: Quantum Numbers and The H-Atom
Topic: Angular momentum quantum No. vs magnetic quantum no.
Replies: 2
Views: 344

Angular momentum quantum No. vs magnetic quantum no.

May someone explain the difference between angular momentum quantum number l and magnetic quantum number m?

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