Search found 22 matches

by Rhea Palsule
Sat Mar 12, 2016 3:06 am
Forum: *Cycloalkanes
Topic: Atomic number vs Alphabetizing
Replies: 1
Views: 298

Atomic number vs Alphabetizing

When naming a cyclohexane with the substituents of Iodine and Bromine for example, would you give the lower number to the Bromine because of alphabetizing or would you give it to the Iodine because it has a higher atomic number?
by Rhea Palsule
Fri Mar 11, 2016 4:18 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Equatorial Priority
Replies: 1
Views: 597

Equatorial Priority

Do you determine which element substituent is prioritized to get the equatorial position in a chair conformation based on higher atomic number or higher atomic radius? For example with Br and Cl as substituents.
by Rhea Palsule
Wed Mar 02, 2016 10:45 pm
Forum: *Alkenes
Topic: Bond Angle of Alkene
Replies: 1
Views: 424

Bond Angle of Alkene

What are the bond angles of the carbons in alkenes? For example C3H6?
by Rhea Palsule
Wed Feb 24, 2016 6:13 pm
Forum: *Electrophilic Addition
Topic: Single Headed Arrow
Replies: 1
Views: 364

Single Headed Arrow

When drawing the arrow from nucleophiles to electrophile, what is an example of when only one electron moves from nucleophile to electrophile? It seems like all the examples are normally with double headed arrows.
by Rhea Palsule
Fri Feb 19, 2016 7:34 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Spontaneous Rxn vs Energetically Favorable
Replies: 1
Views: 781

Spontaneous Rxn vs Energetically Favorable

What is the difference between a spontaneous reaction and an energetically favorable reaction in terms of the graph of the reactants to products?
by Rhea Palsule
Mon Feb 08, 2016 10:40 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Winter 2015 Midterm 4B
Replies: 1
Views: 350

Winter 2015 Midterm 4B

In the problem, the volume is expanding from 3.3L to 9.2*10^5 L. However, when calculating the heat capacity for step 2, the solution says that volume is constant and C= 3/2(R). Shouldn't it be 5/2(R) because the pressure is constant?
by Rhea Palsule
Mon Feb 08, 2016 12:18 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Determining Overall Reaction
Replies: 1
Views: 283

Determining Overall Reaction

If you are given two half reactions (both written as reductions) and are asked to write the overall reaction, how do you determine which half reaction is the oxidized reaction and should be flipped? For example, 7A in the 2011 Midterm.
by Rhea Palsule
Fri Feb 05, 2016 11:37 am
Forum: Calculating Work of Expansion
Topic: Expanding Freely
Replies: 1
Views: 339

Expanding Freely

Why is a system that is expanding freely considered to be doing zero work?
by Rhea Palsule
Mon Jan 25, 2016 4:59 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Isothermal
Replies: 3
Views: 460


When a system is isothermal, isn't q (enthalpy) always 0 because delta T is 0? In our practice quizzes, it showed q to equal -w. Is this because it was reversible? If it was irreversible, would q then be equal to 0?
by Rhea Palsule
Wed Jan 20, 2016 12:13 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Calculating q (Enthalpy)
Replies: 2
Views: 334

Calculating q (Enthalpy)

In homework problem 8.53, the answer key uses the equation q= -C x T. Why is moles or grams not taken into account for this problem? Why is it necessary to use this equation rather than q= n x C x T?
by Rhea Palsule
Tue Jan 12, 2016 5:33 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Enthalpy Calculation
Replies: 1
Views: 338

Enthalpy Calculation

When calculating enthalpy, how do you know when to use grams in the equation (grams x specific heat x change in temperature) or moles in the equation (moles x molar heat capacity x change in temperature) ? How do the two equations differ?
by Rhea Palsule
Wed Jan 06, 2016 6:07 pm
Forum: Phase Changes & Related Calculations
Topic: Steam
Replies: 2
Views: 428


When steam touches the skin, Dr. Lavelle explained how first it would phase change to water (40.7 kJ/mol) and then would decrease in temperature, still in the liquid phase. Could you predict how much the temperature of the water will actually decrease by taking the average of the temperature of the ...
by Rhea Palsule
Thu Dec 03, 2015 1:10 am
Forum: Conjugate Acids & Bases
Topic: Autoprotolysis
Replies: 1
Views: 340


In the course reader, the definition of an autoprotolysis reaction is when one molecule transfers a proton to another molecule of the same type. What does it mean when it says "same type"? Does this mean an acid/base with its conjugate?
by Rhea Palsule
Wed Nov 25, 2015 11:30 pm
Forum: Conjugate Acids & Bases
Topic: Protonating the Carboxyl Group
Replies: 1
Views: 316

Protonating the Carboxyl Group

For a compound with COO- attached, one of the O's has three lone pairs and therefore has a high affinity for protons and can pull off a hydrogen from water so that the formal charge becomes zero. However, once this occurs, the oxygen in water molecule has three lone pairs. Does this mean that the pr...
by Rhea Palsule
Tue Nov 17, 2015 4:02 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Dentates
Replies: 1
Views: 341


When determining if a molecule is monodentate or polydentate, do you simply look at the number of lone electron pairs? Or should you also take formal charge into account? For example oxygen with 2 lone pairs and 2 bonds has a formal charge of 0 but 2 lone pairs. Does that mean it is polydentate or m...
by Rhea Palsule
Thu Nov 12, 2015 6:54 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Effects of Changing Volume
Replies: 1
Views: 294

Effects of Changing Volume

During lecture, Dr. Lavelle mentioned that a quick way to determine if a reaction follows a forward or reverse reaction by decreasing volume could be comparing the number of moles of both product(s) and reactant(s). How would you apply this if the moles were equal for both products and reactants? Wo...
by Rhea Palsule
Tue Nov 03, 2015 10:29 pm
Forum: Dipole Moments
Topic: Polarity of Double Bonds
Replies: 1
Views: 1613

Polarity of Double Bonds

Is an anion such as PO4 3- , which has 3 single bonds and 1 double bond, considered polar? Would the double bond of one of the oxygens cause that oxygen to pull more electrons because it has a shorter distance from the central atom, causing a dipole moment?
by Rhea Palsule
Tue Oct 27, 2015 9:44 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Linear Molecular Geometry
Replies: 2
Views: 545

Linear Molecular Geometry

If the shape of a molecule is linear with lone pairs, is the bond angle always still 180 degrees or can it be less than that as a result of lone pair repulsion?
by Rhea Palsule
Wed Oct 21, 2015 3:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pair Repulsion for T-shape
Replies: 1
Views: 352

Lone Pair Repulsion for T-shape

Dr. Lavelle mentioned that when creating a Lewis diagram, lone pairs must be placed as far as possible from each other. However, with the Lewis structure of IF3, for example, the two sets of lone pairs for Iodine are right next to each other as the molecule forms a T-shape structure. Why aren't the ...
by Rhea Palsule
Wed Oct 14, 2015 9:32 pm
Forum: Trends in The Periodic Table
Topic: 2nd Ionization Energy
Replies: 2
Views: 541

2nd Ionization Energy

During lecture, Dr. Lavelle mentioned that the 2nd ionization energy of an element is always higher. What about an element like magnesium when you have already removed an electron and the electron configuration is now [Ne]3s1? Wouldn't the element be more "willing" to give up another elect...
by Rhea Palsule
Mon Oct 05, 2015 11:54 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Angular Momentum
Replies: 1
Views: 272

Angular Momentum

In the course reader, it explains that angular momentum can have the values l=0,1,2,...,n-1. Since n can go all the way to 7, can the angular momentum go beyond 3? If so, what orbital does the angular momentum correspond to once it exceeds 3 with the f-orbital?
by Rhea Palsule
Tue Sep 29, 2015 10:07 am
Forum: Properties of Light
Topic: Increasing Intensity of Light
Replies: 2
Views: 539

Increasing Intensity of Light

During lecture, Dr. Lavelle mentioned that an increase in light intensity does not mean an increase in energy, but rather just an increase in number of photons emitted. However, by increasing the number of photons, which are packets of energy, isn't energy also increased as a result? Therefore, is i...

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