Search found 24 matches

by Rachna Goli 3E
Sat Mar 12, 2016 7:24 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Cis/trans vs. Z/E
Replies: 1
Views: 263

Cis/trans vs. Z/E

Why do all the examples in the course reader use cis/trans on cyclohexanes instead of Z/E? Don't cis/trans only apply to carbons around double bonds/triple bonds?
by Rachna Goli 3E
Thu Mar 10, 2016 2:15 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Rate Laws
Replies: 1
Views: 166

Rate Laws

How do you determine the raw law equation when none of the steps are slow?
by Rachna Goli 3E
Mon Mar 07, 2016 4:39 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Cyclobutane
Replies: 1
Views: 287

Cyclobutane

Why does cyclobutane have no steric strain? Does it have any torsional strain?
by Rachna Goli 3E
Thu Mar 03, 2016 2:14 pm
Forum: *Complex Reaction Coordinate Diagrams
Topic: Enthalpy
Replies: 1
Views: 391

Enthalpy

Why is it that transition state enthalpies tend to be positive?
by Rachna Goli 3E
Tue Mar 01, 2016 12:25 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Ea & K
Replies: 1
Views: 153

Ea & K

Why does K decrease when activation energy increases?
by Rachna Goli 3E
Thu Feb 25, 2016 1:58 pm
Forum: *Electrophilic Addition
Topic: Electrophilic addition and nucleophilic substitution
Replies: 1
Views: 196

Electrophilic addition and nucleophilic substitution

What is the difference between electrophilic addition and nucleophilic substitution? How can you tell when to do one or the other?
by Rachna Goli 3E
Tue Feb 16, 2016 8:16 pm
Forum: General Rate Laws
Topic: Rate Constant
Replies: 1
Views: 201

Rate Constant

What factors affect the rate constant, k? Does only temperature influence it?
by Rachna Goli 3E
Mon Feb 15, 2016 7:53 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Reaction Order
Replies: 1
Views: 215

Reaction Order

Why is the reaction order the sum, rather than the products, of the orders of each reactant?
by Rachna Goli 3E
Sun Feb 07, 2016 10:23 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Difference in values of Gibbs Free Energy
Replies: 2
Views: 1009

Difference in values of Gibbs Free Energy

Why is the Gibbs Free Energy of formation 3.11 kJ/mol for Br2 gas but only 0 kJ/mol for H2 gas?
by Rachna Goli 3E
Tue Feb 02, 2016 2:35 pm
Forum: Balancing Redox Reactions
Topic: Redox Reactions in Basic Solutions
Replies: 1
Views: 203

Redox Reactions in Basic Solutions

Why do you have to balance half-reactions by adding OH- and H2O to each side? Why can't you balance half-reactions by just adding H+?
by Rachna Goli 3E
Sun Jan 24, 2016 11:18 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Thermodynamic stability
Replies: 1
Views: 179

Thermodynamic stability

Why is a compound more thermodynamically stable when its Gibbs free energy is negative than when it's positive?
by Rachna Goli 3E
Wed Jan 20, 2016 1:07 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy: cooling of hot metal
Replies: 2
Views: 413

Re: Entropy: cooling of hot metal

Entropy is a concept that involves both the system and its surroundings. Entropy increases because even though the system decreases in entropy, its surroundings increase in entropy.
by Rachna Goli 3E
Tue Jan 12, 2016 2:17 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: q
Replies: 1
Views: 214

Re: q

Q is the heat that is absorbed or lost in a reaction.
q = mass * change in temperature * specific heat
by Rachna Goli 3E
Tue Jan 05, 2016 8:07 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpies for State Changes
Replies: 3
Views: 443

Enthalpies for State Changes

What is the relationship between the heat of vaporization and the heat of fusion?
by Rachna Goli 3E
Thu Dec 03, 2015 10:02 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Henderson-Hasselbalch Equation
Replies: 2
Views: 324

Henderson-Hasselbalch Equation

Why is it that you calculate the pH of a weak acid or base using the Henderson-Hasselbalch equation, but you don't use it for strong acids and bases?
by Rachna Goli 3E
Tue Nov 24, 2015 4:08 pm
Forum: Polyprotic Acids & Bases
Topic: Ka of Polyprotic Acids
Replies: 1
Views: 241

Ka of Polyprotic Acids

Why is it that the Ka of the final dissociation of a polyprotic acid is the multiplication of the Ka's of the intermediate steps of the dissociation?
by Rachna Goli 3E
Sat Nov 21, 2015 8:43 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH below or above 7 or neutral
Replies: 4
Views: 1104

Re: pH below or above 7 or neutral

To calculate the pH of a solution, first calculate the H+ or H3O+ ion concentration in the solution. The pH = -log([H+]) and based on the number you get (<7, 7, or >7), you can infer whether the solution is acidic, neutral, or basic. You can use the general rule that acids usually produce H+ or H3O+...
by Rachna Goli 3E
Tue Nov 10, 2015 9:01 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate Identification
Replies: 1
Views: 316

Polydentate Identification

Why is it that CO3(2-) can only be a mono- or bidentate ligand? Why can't it be a tridentate ligand if it has 3 oxygen atoms?
by Rachna Goli 3E
Sat Nov 07, 2015 3:56 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Q and K
Replies: 1
Views: 186

Q and K

Why is it that when Q is less than K, the reaction shifts to the right and when Q is greater than K, the reaction shifts to the left?
by Rachna Goli 3E
Fri Oct 30, 2015 11:11 pm
Forum: Dipole Moments
Topic: Polarizability vs. Polarizing Power?
Replies: 1
Views: 1021

Re: Polarizability vs. Polarizing Power?

Polarizing power refers to a cation's ability to attract the electrons of an anion and thereby distort its electron cloud. However, polarizability refers to the ability of an anion's electron cloud to be distorted.
by Rachna Goli 3E
Sun Oct 25, 2015 11:35 am
Forum: Hybridization
Topic: Hybridization of atoms
Replies: 1
Views: 283

Hybridization of atoms

Why do different atoms in a molecule have difference hybridizations if the overall molecule has a certain number of bonds?
by Rachna Goli 3E
Sun Oct 18, 2015 4:19 pm
Forum: Lewis Structures
Topic: Resonance for CO3 2-
Replies: 1
Views: 772

Resonance for CO3 2-

How many resonance structures does CO3 2- have?
by Rachna Goli 3E
Fri Oct 09, 2015 11:04 am
Forum: Quantum Numbers and The H-Atom
Topic: Orbital shapes
Replies: 1
Views: 417

Orbital shapes

I know that the s, p, d, and f orbital designations refer to different shapes of orbitals, but does orbital shape affect the chemical properties of an atom?
by Rachna Goli 3E
Fri Oct 02, 2015 11:57 am
Forum: Properties of Light
Topic: Relationship between frequency and wavelength
Replies: 7
Views: 879

Relationship between frequency and wavelength

Why is it that frequency and wavelength have an inverse relationship?

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