Search found 51 matches

by 604807557
Sun Mar 18, 2018 10:33 pm
Forum: *Nucleophiles
Topic: SN2 Reactions
Replies: 4
Views: 1042

Re: SN2 Reactions

How do we predict the product of a SN2 reaction?
by 604807557
Sun Mar 18, 2018 10:34 am
Forum: Balancing Redox Reactions
Topic: test 2
Replies: 5
Views: 365

Re: test 2

How do you calculate it?
by 604807557
Sun Mar 18, 2018 3:34 am
Forum: Balancing Redox Reactions
Topic: Winter 2011 Final Exam- Q3A
Replies: 1
Views: 208

Winter 2011 Final Exam- Q3A

Q3A. Balance the following redox equation which takes place under basic conditions.
MnO2(s) + ClO-(aq) -> MnO4^2-(aq)+Cl-(aq)

How do I do this?
by 604807557
Sun Mar 11, 2018 11:56 pm
Forum: Balancing Redox Reactions
Topic: redox
Replies: 6
Views: 257

Re: redox

OIL RIG

Oxygen is losing - oxidizing agent gains electrons

Reduction is gaining - reducing agent loses electron
by 604807557
Sun Mar 11, 2018 11:55 pm
Forum: Administrative Questions and Class Announcements
Topic: Chapters in Final Exam
Replies: 3
Views: 279

Chapters in Final Exam

In the syllabus it says that we're going to go over chapters 8, 9, 11, 14, and 15 throughout the quarter. Is the final going to include any other chapters or just these?
by 604807557
Sun Mar 11, 2018 11:45 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Molar Entropy
Replies: 9
Views: 473

Re: Molar Entropy

Large = more complex = more possible orientations = higher entropy
Small = less complex = less possible orientations = lower entropy
by 604807557
Sun Mar 04, 2018 11:24 pm
Forum: General Rate Laws
Topic: zero order in rate laws
Replies: 8
Views: 277

Re: zero order in rate laws

You write it without it since it has no affect
by 604807557
Sun Mar 04, 2018 10:58 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: k units [ENDORSED]
Replies: 7
Views: 317

Re: k units [ENDORSED]

It’s different units depending on the rate order because each order has different powers the concentration is raised to so using the rate law you get different units for k in each rate order.
by 604807557
Sun Mar 04, 2018 10:40 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Affects rate of chemical reactions
Replies: 2
Views: 143

Re: Affects rate of chemical reactions

Reactant concentrations, temperature, solvent and catalyst properties
by 604807557
Sun Feb 25, 2018 11:57 pm
Forum: General Rate Laws
Topic: rate of reaction vs rate law
Replies: 2
Views: 117

Re: rate of reaction vs rate law

The rate law relates the rate of a reaction to the concentration or pressure of the reactants. The rate of a reaction is proportional to the concentration or pressure of the reactants modified by the reaction order.
by 604807557
Sun Feb 25, 2018 11:50 pm
Forum: First Order Reactions
Topic: First order reactions vs second order reactions [ENDORSED]
Replies: 3
Views: 265

Re: First order reactions vs second order reactions [ENDORSED]

A first order reaction will have an overall order of one, the sum of all the exponents will be 1. A second order reaction will have an overall order of 2, the sum of all the exponents will be 2.
by 604807557
Sun Feb 25, 2018 11:14 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Homework 15.19
Replies: 3
Views: 189

Re: Homework 15.19

It's not always necessary, it's just better
by 604807557
Sun Feb 18, 2018 11:15 pm
Forum: Balancing Redox Reactions
Topic: Basic and Acidic conditions [ENDORSED]
Replies: 11
Views: 3382

Re: Basic and Acidic conditions [ENDORSED]

Yes you’re right
by 604807557
Sun Feb 18, 2018 11:05 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Electrochemical Series Definition
Replies: 4
Views: 173

Re: Electrochemical Series Definition

An electrochemical series is a series of chemical elements arranged in order of their standard electrode potentials. The series shows the order in which metals replace one another from their salts.
by 604807557
Tue Feb 13, 2018 10:54 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Practice Midterm W18 by Lyndon and Michael (Q 1B)
Replies: 2
Views: 226

Practice Midterm W18 by Lyndon and Michael (Q 1B)

I'm not sure how to approach this problem or what formula to use. Can someone please explain how to do solve this. "Dr. Lavelle picks up the ice cream that he has just heated up (-2.8 degree C) and accidentally drops it on the ground and can’t eat it. Tears streaming down, he watches as half of...
by 604807557
Sun Feb 11, 2018 11:58 pm
Forum: Balancing Redox Reactions
Topic: Oxidation
Replies: 5
Views: 282

Re: Oxidation

Yeah^^simply put, the oxidation number shows you the charge
by 604807557
Sun Feb 11, 2018 11:55 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Entropy
Replies: 6
Views: 261

Re: Entropy

Vibration causes disorder which means an increase in entropy. Diatomic molecules would have greater entropy because the more complex the molecule the more entropy there is.
by 604807557
Sun Feb 11, 2018 11:39 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Cp v. Cv!
Replies: 5
Views: 257

Re: Cp v. Cv!

I kept wondering the same thing but during today's review session Lyndon said you'd use Cp when it specifically states "at constant pressure" in the problem.
by 604807557
Sun Feb 04, 2018 11:57 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Higher Molar Entropy
Replies: 4
Views: 180

Re: Higher Molar Entropy

Entropy values are given as standard molar entropy which is the entropy of one molecule of a substance as standard state conditions. The standard molar entropy of any substance increases as the temperature increases.
by 604807557
Sun Feb 04, 2018 11:25 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 5
Views: 305

Re: Midterm

I think my ta had said it's on chapters 8, 9, and 11
by 604807557
Sun Feb 04, 2018 11:17 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Test 1 Question
Replies: 4
Views: 241

Test 1 Question

Why is "The contents of an ideal cooler at 3 degrees C" an isolated system and not closed?
by 604807557
Sun Jan 28, 2018 11:58 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Exothermic vs Exergonic and Endothermic vs Endergonic
Replies: 3
Views: 2301

Re: Exothermic vs Exergonic and Endothermic vs Endergonic

Exothermic/Endothermic: refer to transfer of heat or changes in enthalpy
Exergonic/Endergonic: refer to changes in free energy

Positive enthalpy change is endergonic because heat is absorbed and the products are higher in energy than the reactants
by 604807557
Sun Jan 28, 2018 11:52 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Microstates [ENDORSED]
Replies: 3
Views: 234

Re: Microstates [ENDORSED]

A microstate is a specific way that the energy of a system can be arranged. Microstates tend to be indistinguishable from each other which means the more indistinguishable the higher the entropy.
by 604807557
Sun Jan 28, 2018 11:46 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Test question [ENDORSED]
Replies: 16
Views: 631

Re: Test question [ENDORSED]

The question was pretty vague so I was also wondering how specific we were supposed to be because all I answered was that "Energy can't be created or destroyed, conservation of energy."
by 604807557
Mon Jan 22, 2018 1:02 am
Forum: Administrative Questions and Class Announcements
Topic: Reversible and Isothermal Expansions
Replies: 2
Views: 196

Re: Reversible and Isothermal Expansions

Perfect- got it, thank you!
by 604807557
Mon Jan 22, 2018 12:00 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Entropy of an Isolated System
Replies: 4
Views: 197

Re: Entropy of an Isolated System

I think it doesn't decrease since it's at maximum entropy when it reaches equillibrium.
by 604807557
Sun Jan 21, 2018 11:57 pm
Forum: Administrative Questions and Class Announcements
Topic: Reversible and Isothermal Expansions
Replies: 2
Views: 196

Reversible and Isothermal Expansions

Just to clarify, for Chem 14b, will test 1 include Reversible and Isothermal Expansions?
by 604807557
Sun Jan 21, 2018 11:52 pm
Forum: General Science Questions
Topic: Sig Figs
Replies: 3
Views: 367

Re: Sig Figs

Yes most likely; always pay attention to and use correct sig figs in chemistry.
by 604807557
Sun Jan 14, 2018 11:58 pm
Forum: Phase Changes & Related Calculations
Topic: Endo and Exothermic Ways to Remember
Replies: 28
Views: 3040

Re: Endo and Exothermic Ways to Remember

Exothermic reminds me of exit and the first 2 letter in endothermic reminds me of in (enter).
by 604807557
Sun Jan 14, 2018 11:52 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Thermochemical equation
Replies: 5
Views: 265

Re: Thermochemical equation

A thermochemical equation is a balanced chemical equation that has the physical states of all reactants and products along with the energy change. The reaction is endothermic if energy is a reactant and exothermic if energy is a product.
by 604807557
Sun Jan 14, 2018 11:38 pm
Forum: Administrative Questions and Class Announcements
Topic: Textbook Question
Replies: 1
Views: 115

Re: Textbook Question

Hi,

Dr. Lavelle noted in his syllabus "Please note we are not using the 7th edition. Students can use it but it is more expensive."
by 604807557
Mon Jul 31, 2017 12:29 am
Forum: Identifying Acidic & Basic Salts
Topic: Salts
Replies: 3
Views: 476

Re: Salts

Chels Zh 1D wrote:Generally speaking, salts are the products of acids and bases, an ionic compound composing of cation and anion.


In addition to this, salts have an overall electrical charge of 0 therefore they are electrically neutral.
by 604807557
Mon Jul 31, 2017 12:17 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Question about the exam
Replies: 3
Views: 396

Re: Question about the exam

My TA said the values will be given in the exam therefore we don't need to memorize them
by 604807557
Mon Jul 31, 2017 12:14 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Chemical Equilibrium: Course Reader page 134
Replies: 2
Views: 338

Re: Chemical Equilibrium: Course Reader page 134

Species is referring to atoms, molecules, ions, elements, etc., being subjected to a chemical process
by 604807557
Sun Jul 30, 2017 10:27 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Example from Pg 134 in Course Reader
Replies: 1
Views: 195

Example from Pg 134 in Course Reader

In the example from this page, K is being used to calculate the concentration of a species at equilibrium.

The example asks what PPCl3 is at equilibrium.

How do you go from KP = PPCl3 PCl2 / PPCl5 to PPCl3 = KP PPCl5 / PCl2 ?
by 604807557
Sun Jul 23, 2017 9:56 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: What is Kc and Q?
Replies: 1
Views: 224

Re: What is Kc and Q?

Kc is the ratio of products/reactants at equilibrium, Q is the direction a reaction will proceed.
by 604807557
Sun Jul 23, 2017 9:37 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Self-Test 2 Problem 4
Replies: 2
Views: 336

Self-Test 2 Problem 4

The problem is:

For the complex ions listed below, determine the oxidation state and the coordination number of the central metal ion.
[Pt(CN)(NH3)3]^+

My question is, how do you find the oxidation state? Also, I got the coordination number 4, is that correct?
by 604807557
Sun Jul 23, 2017 9:20 pm
Forum: Naming
Topic: Naming Ligands
Replies: 4
Views: 348

Re: Naming Ligands

The method I used to practice naming ligands was I wrote the ligand on one side of a flashcard and the name of it on the back. I repeatedly went through the flashcards and looked at the name and named the ligand (checking the back to see if I was correct) or vice versa (looked at the ligand side of ...
by 604807557
Sun Jul 23, 2017 8:59 pm
Forum: Lewis Structures
Topic: Homework problem 3.25
Replies: 6
Views: 647

Re: Homework problem 3.25

For part b of problem 3.25, the answer is In2S3 but for In I got +3 and for S I got +6. How do you get In2S3? Same for part d; the answer is H2Te but for H I got +1 and for Te I got +6, the answer is H2Te not H6Te.
by 604807557
Mon Jul 17, 2017 4:28 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Unpaired electrons
Replies: 4
Views: 416

Re: Unpaired electrons

In order to find the number of unpaired electrons you first have to write the electron configuration. Then, you can either draw the valence orbitals or picture it in your head and see how many electrons are unpaired. For example, if the electron configuration ends with 3p^4 you would have to know th...
by 604807557
Mon Jul 17, 2017 4:12 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Question 2.41
Replies: 1
Views: 243

Re: Question 2.41

(b) is not possible because l = 0 so ml must also = 0
(c) is not possible because the maximum value l can have is n - 1 and since n = 4, 4 - 1 = 3 so the maximum l can be is 3 not 4
by 604807557
Mon Jul 17, 2017 3:46 am
Forum: Dipole Moments
Topic: Dipole moments
Replies: 6
Views: 366

Re: Dipole moments

A dipole is a positive charge next to an equal but opposite negative charge. A dipole moment (μ) is the magnitude of the dipole.
by 604807557
Wed Jul 12, 2017 7:21 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Problem 2.47
Replies: 3
Views: 456

Problem 2.47

For each of the following ground-state atoms, predict the type of orbital (1s, 2p, 3d, 4f, etc.) from which an electron will be removed to form the +1 ion: (a) Ge; (b) Mn; (c) Ba; (d) Au.

The answers are: (a) 4p; (b) 4s; (c) 6s; (d) 6s

What method should I use to get the correct answers?
by 604807557
Mon Jul 10, 2017 12:02 am
Forum: Ionic & Covalent Bonds
Topic: Angstrom
Replies: 1
Views: 191

Angstrom

Do we have to know the Angstroms for chemical bonds or just that double bonds are shorter than single bonds and triple bonds are shorter than double bonds?
by 604807557
Sun Jul 09, 2017 11:57 pm
Forum: Ionic & Covalent Bonds
Topic: Polyatomic Lewis Structures
Replies: 5
Views: 663

Re: Polyatomic Lewis Structures

Anions gain electrons, cations lose electrons
by 604807557
Sun Jul 09, 2017 11:44 pm
Forum: Properties of Light
Topic: Problem 1.57
Replies: 1
Views: 194

Problem 1.57

Problem 57 from Chapter 1 in the textbook:

Lines in the Balmer series of the hydrogen spectrum are observed at 656.3, 486.1, 434.0, and 410.2 m. What is the wavelength of the next line in the series?

How do you start off/solve this problem?
by 604807557
Sun Jul 09, 2017 11:33 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration Drawing
Replies: 1
Views: 184

Electron Configuration Drawing

Do we have to know how to draw electron configurations for the exam on Wednesday?
by 604807557
Sun Jul 02, 2017 11:58 pm
Forum: Properties of Light
Topic: Light is a Wave, Light is Photons
Replies: 3
Views: 341

Re: Light is a Wave, Light is Photons

When light undergoes reflection, refraction, and diffraction it acts as a wave. When it packages its energy in small quanta it acts as a series of photons.
by 604807557
Sun Jul 02, 2017 11:44 pm
Forum: Photoelectric Effect
Topic: Worked Example
Replies: 1
Views: 282

Worked Example

I'm going through the "The Quantum World" notes in the course reader and after reviewing the first worked example: "The following questions relate to the same metal used in a series of photoelectric experiments. If 3.61 x 10^-19 J is required to remove an electron with zero kinetic en...
by 604807557
Sun Jul 02, 2017 11:28 pm
Forum: Properties of Electrons
Topic: Wave Properties of Electrons
Replies: 3
Views: 282

Re: Wave Properties of Electrons

A wave like property that electrons have is the discrete atomic energy levels. Another wave like property that electrons have is the diffraction of electrons from crystal planes in solid materials.
by 604807557
Sun Jul 02, 2017 11:08 pm
Forum: Properties of Light
Topic: Light is a Wave, Light is Photons
Replies: 3
Views: 341

Re: Light is a Wave, Light is Photons

Light can't simultaneously be a pure wave and photon therefore there are not any instances where it acts as both.

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