## Search found 113 matches

Sun Mar 08, 2020 7:41 pm
Forum: Second Order Reactions
Topic: Example Help (Second Order)
Replies: 2
Views: 128

### Example Help (Second Order)

Can someone walk through a second order reaction problem step by step? Please include side information, conceptual knowledge, and graphical representations?
Sun Mar 08, 2020 7:40 pm
Forum: First Order Reactions
Topic: Example Help (First Order)
Replies: 1
Views: 52

### Example Help (First Order)

Can someone walk through a first order reaction problem step by step? Please include side information, conceptual knowledge, and graphical representations?
Sun Mar 08, 2020 7:40 pm
Forum: Zero Order Reactions
Topic: Example Help
Replies: 6
Views: 171

### Example Help

Can someone walk through a zero order reaction problem step by step? Please include side information, conceptual knowledge, and graphical representations?
Sun Mar 08, 2020 7:39 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Determination
Replies: 1
Views: 45

### Determination

How do we solve for different state variables with given rates laws and values?
Sun Mar 08, 2020 7:38 pm
Forum: General Rate Laws
Topic: Definition
Replies: 4
Views: 124

### Definition

What are the different rate laws, their concepts, and types? What do we need to succeed in this class?
Sun Mar 08, 2020 7:37 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Versus Versus
Replies: 1
Views: 41

### Versus Versus

What are the primary conceptual and mathematical differences between kinetics and thermodynamics? Can you explain through example and application?
Sun Mar 08, 2020 7:35 pm
Forum: Biological Examples (*DNA Structural Transitions, etc.)
Topic: Application in Biology
Replies: 2
Views: 107

### Application in Biology

As also a student of LS 7A, I can see the connection between thermodynamics and biological application. But for the purposes of excelling in the course, what are the ideal chemical concepts that we need to know to ace the final?
Sun Mar 08, 2020 7:33 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: The Third Law
Replies: 3
Views: 105

### The Third Law

What is the definition of the Third Law of Thermodynamics, its essential concepts, and primary applications?
Sun Mar 08, 2020 7:32 pm
Forum: Environment, Fossil Fuels, Alternative Fuels
Topic: Gibbs and Environment
Replies: 1
Views: 98

### Gibbs and Environment

What are example problems we'll encounter that could link together Gibbs Free Energy and Alternative Fuels? What are the main concepts needed to solve said problem?
Sun Mar 08, 2020 7:31 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Equations
Replies: 8
Views: 154

### Equations

What are the different, but essential, equations for gibbs free energy in thermodynamics? How can we manipulate the Gibbs Free energy equation with the R constant?
Sun Mar 08, 2020 7:29 pm
Forum: Van't Hoff Equation
Topic: Van't Hoff Equation
Replies: 6
Views: 160

### Van't Hoff Equation

What are the different ways in which we can manipulate the equation? What are the primary applications of this formula?
Sun Mar 08, 2020 7:28 pm
Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
Topic: Types of Batteries
Replies: 3
Views: 89

### Types of Batteries

How do rechargeable batteries differ from normal ones? Do said rechargeable batteries differ greatly in products like phones or vehicles?
Sun Mar 08, 2020 7:22 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Application
Replies: 6
Views: 126

### Application

What are the different ways in which we manipulate the Gibbs Free Energy Equation for Electrochemistry and/or combine/separate the equation with other appropriate equations for this unit? Can someone provide a list and example?
Sun Mar 08, 2020 7:21 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Cathode and Anode K
Replies: 2
Views: 72

### Cathode and Anode K

How do we solve for either the anode or cathode when we're given the K of either one and other necessary values to complete the question? Can someone provide an example of said case?
Sun Mar 08, 2020 7:20 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams
Replies: 13
Views: 199

### Cell Diagrams

When are the instances that we have to add an inert solid to either end of the cell diagram? Is it always one or two ends of it?
Sun Mar 08, 2020 7:18 pm
Forum: Balancing Redox Reactions
Topic: Balancing Basic Redox Reactions
Replies: 6
Views: 86

### Balancing Basic Redox Reactions

I understand how to approach an acidic redox reaction, but what are the steps to balance a chemical reaction in a basic solution?
Thu Feb 13, 2020 3:06 pm
Forum: Calculating Work of Expansion
Topic: Last Question on the Midterm [ENDORSED]
Replies: 5
Views: 205

### Last Question on the Midterm[ENDORSED]

With the conclusion of the midterm, does anyone know how the final question should've been approached, calculated and solved? What were the types of concepts that were in play in this specific assessment?
Thu Feb 13, 2020 3:05 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Differences in Heat Capacity
Replies: 4
Views: 156

### Differences in Heat Capacity

What are the different types of heat capacities we should take into account for this class?
Thu Feb 13, 2020 3:03 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Differences
Replies: 5
Views: 205

### Differences

How do open, closed, and isolated system conditions affect a reaction?
Thu Feb 13, 2020 3:03 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Isobaric systems
Replies: 16
Views: 226

### Re: Isobaric systems

Isobaric is constant pressure, isochoric is constant volume, and isothermal is constant temperature. With these conditions, you'll need to match up the right equations with each one. There are reversible and irreversible equations.
Thu Feb 13, 2020 3:01 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy Changes
Replies: 3
Views: 117

### Entropy Changes

How does entropy change with adjusting pressure, volume, temperature, heat, etc?
Thu Feb 13, 2020 3:01 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Enthalpies
Replies: 3
Views: 125

### Enthalpies

Why do some molecules have no enthalpies (e.g. zero enthalpy) and other do?
Thu Feb 13, 2020 2:59 pm
Forum: Calculating Work of Expansion
Topic: Work
Replies: 5
Views: 88

### Work

What's the difference in the work equations with their corresponding Delta S equations when one path is reversible and when the other is irreversible?
Thu Feb 13, 2020 2:58 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess Law
Replies: 6
Views: 109

### Re: Hess Law

You'll need to get the overall change in enthalpy for each equation used. If you're adding equations together to calculate the overall reactionary enthalpy, you'll need to scale and/or flip your equations with the calculated enthalpies to find the final answer.
Thu Feb 13, 2020 2:56 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies with Molecules
Replies: 4
Views: 69

### Bond Enthalpies with Molecules

How do we calculate bond enthalpies if we are given a chemical equation showing only the molecules and their number of bonds/atoms?
Thu Feb 13, 2020 2:56 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Delta S
Replies: 8
Views: 242

### Delta S

What is the difference between Delta S, Delta S (total), and Delta S (surroundings)? How do we apply these concepts on an examination / question?
Mon Feb 03, 2020 10:19 am
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Thermodynamics Laws
Replies: 4
Views: 55

### Re: Thermodynamics Laws

The first law is about conservation. Everything has an origin and cannot be created out of nowhere. The second law talks about how the universe continues to move towards a state of disorder and higher entropy.
Mon Feb 03, 2020 10:17 am
Forum: Student Social/Study Group
Topic: Midterm and Final Question
Replies: 18
Views: 317

### Re: Midterm and Final Question

The UA’s will have a very helpful study guide for both the final and midterm. Usually, Lyndon completes them and announces it it chem community. Just stay posted. His review session on the study guide is extremely helpful by the way.
Mon Feb 03, 2020 10:16 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: work and volume
Replies: 4
Views: 77

### Re: work and volume

I would like to add a question on top of that. Could someone define “work” and its relationship to volume.
Mon Feb 03, 2020 10:15 am
Forum: Administrative Questions and Class Announcements
Topic: week 5 homework
Replies: 4
Views: 60

### Re: week 5 homework

Honestly, your homework can be anything not completed up to this week. Of course, I wouldn’t go back to do week 1 questions, but I would try doing anything recent or applicable.
Mon Feb 03, 2020 10:14 am
Forum: Administrative Questions and Class Announcements
Topic: slides
Replies: 8
Views: 122

### Re: slides

Lavelle does not post any lecture slides or material. I would just find someone who went to lecture and ask them if they could send you their notes.
Mon Feb 03, 2020 10:13 am
Forum: Student Social/Study Group
Topic: test 1
Replies: 7
Views: 96

### Re: test 1

Like last week, test 1 will have 5-7 questions assessing the topics just learned. Test 1 and 2 are not cumulative. The midterm, around 120 points, will be made by Lavelle as with the Final.
Mon Feb 03, 2020 10:12 am
Forum: Student Social/Study Group
Topic: Midterm study
Replies: 8
Views: 151

### Re: Midterm study

For Lavelle’s class, you just have to ensure that you know the foundational topics and complete the homework problems when possible. Go to the review sessions, and Lyndon’s LA sessions are pretty helpful.
Mon Feb 03, 2020 10:10 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's Law
Replies: 7
Views: 93

### Re: Hess's Law

All Hess’s Law is that you balance all of the chemical equations and cancel when possible to ultimately add all of their delta H’s.
Mon Feb 03, 2020 10:08 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Acidity and Basicity
Replies: 4
Views: 70

### Re: Acidity and Basicity

Thank you for the response. Could someone show me an example of this problem in action. How would I use pH and pOH in an acid/base equilibrium problem?
Mon Feb 03, 2020 10:07 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Shift Change Rules
Replies: 5
Views: 107

### Re: Shift Change Rules

Thank you for the reply, this clarifies a lot for the shift changes. In terms of Q, this makes sense, how about for all the different Le Chatellier’s Principles.
Sun Jan 26, 2020 11:34 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Calculating K
Replies: 15
Views: 213

### Re: Calculating K

You need to balance the equation because the coefficients will be your concentration exponents in the equilibrium constant. Without the balanced equation, your constant is wrong. Also, without balancing the chemical equation, you are breaking the laws of conservation highlighted in chem 14a.
Sun Jan 26, 2020 11:34 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Calculating K
Replies: 15
Views: 213

### Re: Calculating K

You need to balance the equation because the coefficients will be your concentration exponents in the equilibrium constant. Without the balanced equation, your constant is wrong. Also, without balancing the chemical equation, you are breaking the laws of conservation highlighted in chem 14a.
Sun Jan 26, 2020 11:30 pm
Forum: Phase Changes & Related Calculations
Topic: Test 1
Replies: 6
Views: 71

### Re: Test 1

Your grades will be given back to you in your upcoming discussion section. The test will be returned, and it would be your chance to contest for any more points. Slim chance that it happens but it’s possible.
Sun Jan 26, 2020 11:28 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Pressure vs. Volume
Replies: 6
Views: 83

### Re: Pressure vs. Volume

Pressure and volume are inversely related. An increase in volume decreases pressure and decrease in volume increases pressure, so think of them this way when approaching equilibrium shifts. The side with more moles of gas will shift to the other reactionary side with an increase in pressure or decre...
Sun Jan 26, 2020 11:26 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Kw Equations
Replies: 10
Views: 175

### Re: Kw Equations

Kw=ka x kb

Kw=10^-14=(1.0x10^-7)(1.0x10^-7)
Sun Jan 26, 2020 11:24 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE BOX
Replies: 27
Views: 275

### Re: ICE BOX

If the Kc, Ka, or Kb is smaller than 10^-3, then you can assume to remove the -x because it is small relative to the other number.
Sun Jan 26, 2020 11:22 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Shift Change Rules
Replies: 5
Views: 107

### Shift Change Rules

Can someone list all the required shift change rule scenarios that Lavelle would want us to know?
Sun Jan 19, 2020 7:36 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5%
Replies: 4
Views: 42

### 5%

What is the 5% deal that Lavelle talks about in equilibrium oriented questions. How do we get to that point?
Sun Jan 19, 2020 7:35 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ice boc
Replies: 7
Views: 67

### Re: ice boc

The box is a visual aspect that allows us to work towards creating the equilibrium constant easily.
Sun Jan 19, 2020 7:33 pm
Forum: Ideal Gases
Topic: Step Up Session Material
Replies: 2
Views: 35

### Re: Step Up Session Material

It can be both if I remember right. It depends on the LA, but they use a variety of problem examples.
Sun Jan 19, 2020 7:33 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: X was ignored
Replies: 27
Views: 253

### Re: X was ignored

The removal of the -x occurs because it is extremely small relative to the chemical equilibrium. We don’t say it is 0 because the numerator would be affected. We say it is small relative to the rest of the equilibrium allowing it to be ignored.
Sun Jan 19, 2020 7:30 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Temperature
Replies: 5
Views: 47

### Re: Temperature

An endothermic reaction shifts it towards the products and an exothermic reaction shifts it towards the reactants. Chemical equilibrium changes only when temperature is manipulated.
Sun Jan 19, 2020 7:27 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Acidity and Basicity
Replies: 4
Views: 70

### Acidity and Basicity

How do pH and pOH play into chemical equilibrium?
Sun Jan 19, 2020 7:26 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: When do we use the equilibrium sign?
Replies: 7
Views: 73

### Re: When do we use the equilibrium sign?

Any time when there is the presence of forward and reverse reactions, an equilibrium sign will be used. The rate presented should be equivalent in both directions of the chemical reaction.
Sun Jan 12, 2020 8:26 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Reaction Quotient
Replies: 11
Views: 86

### Reaction Quotient

Can someone please explain the importance of the reaction quotient and what on earth it is? I have a general idea, but I tend to confuse it with the likes of Kc and Kp. Thank you!
Sun Jan 12, 2020 8:25 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K
Replies: 10
Views: 77

### Re: K

There’s Kc and Kp. Kc concerns the use of the equilibrium constant in reference to concentrations. Kp concerns the use of the equilibrium constant in reference to partial pressures. Solution vs. gas.
Sun Jan 12, 2020 8:24 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Types of Equilibrium Constants
Replies: 7
Views: 58

### Types of Equilibrium Constants

Are we allowed to interchange the use of Kc and Kp if the question doesn’t specify which type to use?
Sun Jan 12, 2020 8:22 pm
Forum: Ideal Gases
Topic: The Ideal Gas Law
Replies: 3
Views: 36

### The Ideal Gas Law

What makes this law ideal, and what differentiates it from a realistic gas? Also, what type of gas is in the atmosphere?
Sun Jan 12, 2020 8:21 pm
Forum: Ideal Gases
Topic: The Laws
Replies: 7
Views: 78

### The Laws

What are the types of gas laws that we should know for Chem 14B?
Sun Jan 12, 2020 8:20 pm
Forum: Ideal Gases
Topic: PV=nRT
Replies: 3
Views: 20

### PV=nRT

What does the R in the Ideal Gas Equation represent? Also, what are the types of values that can be instituted into R?
Sun Dec 01, 2019 11:56 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Strength
Replies: 4
Views: 159

### Strength

How does a base become stronger and what becomes stronger exactly?
Sun Dec 01, 2019 11:56 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Ionization in Water
Replies: 8
Views: 680

### Re: Ionization in Water

A strong acid fully disassociates in a solution while a weak acid partially disassociates in a solution.
Sun Dec 01, 2019 11:55 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Bases
Replies: 4
Views: 446

### Re: Bases

As Dr. Lavelle explained, the soapy feeling is attributed to the soft salts already present in the water.
Sun Dec 01, 2019 11:54 pm
Forum: Conjugate Acids & Bases
Topic: Definition
Replies: 7
Views: 137

### Definition

What is the definition and purpose of conjugate acids and bases?
Sun Dec 01, 2019 11:54 pm
Forum: Bronsted Acids & Bases
Topic: Definition
Replies: 3
Views: 45

### Definition

What is the definition of a Bronsted Acid and Base that Dr. Lavelle wants us to know?
Sun Dec 01, 2019 11:53 pm
Forum: Lewis Acids & Bases
Topic: Definition
Replies: 7
Views: 153

### Definition

What is the definition of a Lewis Acid and Base that Dr. Lavelle wants?
Sun Nov 24, 2019 8:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: T Shape
Replies: 3
Views: 47

### T Shape

Is T Shape a subcategory under the trigonal bypyramidal geometry? Also, it has three bonded pairs and two lone pairs correct? Lastly, is the notation the following the following: AX3E2?
Sun Nov 24, 2019 8:30 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Fundamentals
Replies: 5
Views: 159

### Fundamentals

What do we need to know from bond order, diamagnetism, and paramagnetism for the class and test?
Sun Nov 24, 2019 8:30 pm
Forum: Hybridization
Topic: Basics
Replies: 2
Views: 39

### Basics

Can someone explain to me the basics and purposes of hybridization? Lavelle was quite ambigious when he explained it, so a refresher on the concepts and notes would be very helpful. Thank you!
Sun Nov 24, 2019 8:28 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Sphere
Replies: 5
Views: 68

### Coordination Sphere

What is exactly contained in the coordination sphere, what is it, and what is the overall purpose?
Sun Nov 24, 2019 8:24 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Definiton
Replies: 1
Views: 29

### Definiton

What exactly is a ligand, and what is its purpose relative to our class and tests?
Mon Nov 18, 2019 4:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSPER
Replies: 7
Views: 221

### Re: VSPER

VSEPR is meant to describe the structural geometry of molecules in a 3 dimensional plane. It also shows regions of electron density.
Mon Nov 18, 2019 4:46 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Notation
Replies: 2
Views: 30

### Notation

What does Lavelle mean by VSEPER Notation?
Mon Nov 18, 2019 4:44 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Class Curve?
Replies: 4
Views: 119

### Class Curve?

Will Chem 14A have a curve? I’ve been reviewing other chemistry community posts, and many say that Lavelle will adjust range percentages accordingly. Can someone explain this? Also, if a student needs at least 50% to get a C-, what are the percent ranges for each letter grade above C-? Thank you in ...
Mon Nov 18, 2019 2:04 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bonds in VSEPR
Replies: 11
Views: 141

### Re: Bonds in VSEPR

In VSEPR, double and triple bonds would still be represented as “single” bonds demonstrably. Lavelle even said that we should think of these spaces as possible spots of electron density where said density of electrons is highest. This is for VSPER models specifically.
Mon Nov 18, 2019 2:02 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 2
Views: 25

### Lone Pairs

Do lone pairs weaken bonded electrons, and what other effects do lone pairs have on overall shape and structure?
Mon Nov 18, 2019 2:01 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: midterm
Replies: 2
Views: 34

### Re: midterm

The wedge and dash aren’t necessarily needed for Lewis structures. Lavelle even said that himself. We can still draw the Lewis structures as normal. The wedge and dash were supposed to help students visualize the overall 3d shape in a 2d illustration.
Mon Nov 18, 2019 1:59 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Shapes
Replies: 6
Views: 62

### Shapes

What are the VSEPR molecular shapes that we should know, plus their bond angles, for the test and final?
Mon Nov 18, 2019 1:56 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 2
Replies: 6
Views: 96

### Re: Test 2

Test 2 starts off with materials covered after the midterm. I remember the lecture that did not count for the midterm included the topics of dipole dipole moments and polarization. Every topic after that moment will possibly be on the second test up to sigma and pi bonds that is supposed to be cover...
Sun Nov 10, 2019 11:37 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Principle Quantum Number
Replies: 1
Views: 113

### Principle Quantum Number

How do we solve for the principal quantum number if we are given values such as velocity and the type of subatomic particle being dealt with?
Sun Nov 10, 2019 11:36 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Comparison
Replies: 1
Views: 26

### Comparison

What is the difference between intermolecular forces and intramolecular forces?
Sun Nov 10, 2019 11:34 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: What’s the Difference
Replies: 6
Views: 257

### What’s the Difference

What is the difference between polarizability and polarizing?
Sun Nov 10, 2019 11:33 pm
Forum: Electronegativity
Topic: Noble Gases
Replies: 40
Views: 1723

### Noble Gases

Are neon gases included in electronegativity? And if so, does xenon have a higher electronegativity that fluorine?
Sun Nov 10, 2019 11:31 pm
Forum: Bond Lengths & Energies
Topic: Rankings
Replies: 2
Views: 42

### Rankings

What are the various bonds that will be discussed, and can someone rank their strengths from weakest to strongest?
Sun Nov 10, 2019 11:29 pm
Forum: Dipole Moments
Topic: Representation
Replies: 1
Views: 22

### Representation

How do we represent dipole moments of varying strengths in a visual, such as a Lewis Structure or anything else?
Sun Nov 03, 2019 4:44 pm
Forum: Quantum Numbers and The H-Atom
Topic: Difference between n, l, and m...?
Replies: 2
Views: 49

### Re: Difference between n, l, and m...?

Thank you so much!
Sun Nov 03, 2019 4:38 pm
Forum: Sigma & Pi Bonds
Topic: Versus
Replies: 3
Views: 69

### Versus

What is the difference between pi and sigma bonds?
Sun Nov 03, 2019 4:38 pm
Forum: Coordinate Covalent Bonds
Topic: Definition
Replies: 17
Views: 231

### Definition

I don't really understand the concept behind a coordinate covalent bond. Professor Lavelle skimmed through it during my lecture. Could someone explain this concept to a greater extent and apply it through an example? Thank you!
Sun Nov 03, 2019 4:36 pm
Forum: Lewis Structures
Topic: Central Atom
Replies: 3
Views: 40

### Central Atom

Does the central atom need to be the lowest ionization energy? And in regards to the formal charge, is it the central atom the one that requires a 0 formal charge or the sum of the entire Lewis Structure? Thank you!
Sun Nov 03, 2019 4:35 pm
Forum: Quantum Numbers and The H-Atom
Topic: Difference between n, l, and m...?
Replies: 2
Views: 49

### Difference between n, l, and m...?

Can someone please help me review the difference between n, l, and m...? I keep mistaking the three of them, and I am not exactly certain what m and its various subscripts represent. Can someone demonstrate this through an example problem? Thank you!
Sun Nov 03, 2019 4:32 pm
Forum: Trends in The Periodic Table
Topic: Element Trend Rankings
Replies: 2
Views: 41

### Element Trend Rankings

There as a bit of confusion in my study group in regards to ranking F, O, N, Cl, S, P by the following periodic trends: 1) electronegativity 2) atomic radius 3) electron affinity 4) Ionization Energies. Can you help me sort them out correctly? Thank you! 1) Electronegativity? 2) Atomic Radius? 3) El...
Sun Nov 03, 2019 4:29 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration Pattern?
Replies: 1
Views: 56

### Electron Configuration Pattern?

Hi, I'm doing a review on electron configuration, but I seem to have forgotten the pattern or order behind determining configuration. So if I randomly picked an element on the periodic table, what steps would I need to take to determine its electron configuration and noble gas configuration? Let's d...
Sun Oct 27, 2019 6:39 pm
Forum: Ionic & Covalent Bonds
Topic: Valence Electrons
Replies: 16
Views: 270

### Re: Valence Electrons

For s and p block elements, start at the metal side and count up from 1 - 8. That's the basic pattern for determining the number of valence electrons. It's slightly different for d-block elements.
Sun Oct 27, 2019 6:36 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Energy Levels
Replies: 1
Views: 41

### Energy Levels

Does the transition from n = 5 to n = 3 involve greater energy than one from n = 4 to n = 2?

And does the transition from n = 4 to n = 2 emit radiation of longer wavelength than the transition from n = 5 to n = 1?

Thank you!
Sun Oct 27, 2019 6:01 pm
Forum: Resonance Structures
Topic: Ideal Lewis Structure
Replies: 4
Views: 70

### Ideal Lewis Structure

How do we determine the most ideal Lewis Structure if any polyatomic structure has multiple resonance structures? How do we calculate it? Thank you!
Sun Oct 27, 2019 5:56 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Module Question
Replies: 1
Views: 38

### Module Question

29. In 1.0 s, a 60 W bulb emits 11 J of energy in the form of infrared radiation (heat) of wavelength 1850 nm. How many photons of infrared radiation does the lamp generate in 1.0 s? How do we complete the dimensional analysis, like watts to joules if that is even right? I'm reviewing this for the m...
Sun Oct 27, 2019 5:51 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge and Lone Pairs
Replies: 4
Views: 78

### Formal Charge and Lone Pairs

When we are calculating the formal charge of an atomic structure, I have a few questions in regards to counting. When we are counting for the number of bonded and lone electrons, do we count in pairs or in electrons individually? This will help me prevent silly mathematical errors. Thank you!
Sun Oct 27, 2019 5:49 pm
Forum: Resonance Structures
Topic: Determining Resonance Structures
Replies: 6
Views: 103

### Determining Resonance Structures

How do we know if a specific polyatomic figure has a resonance structure and which would be the most ideal one? For example, could you use the sulfate ion for a demonstration?
Sun Oct 20, 2019 10:29 pm
Forum: *Shrodinger Equation
Topic: Application
Replies: 1
Views: 58

### Application

Can someone please explain the concept behind the Schrodinger equation? Second, can someone demonstrate its application in real-life chemistry situations? Thank you!
Sun Oct 20, 2019 10:28 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Short Hand
Replies: 11
Views: 123

### Re: Short Hand

To write in short hand, find the specific element that you will use. Let’s use S for this example. Find the preceding noble gas first, which is in group 18 in the preceding period. In S’s case, it is Ne. You would write Ne in brackets first at the beginning of the configuration then finish it off no...
Sun Oct 20, 2019 10:23 pm
Topic: What is it?
Replies: 6
Views: 279

### What is it?

Dr. Lavelle talked about Black Body Radiation, but he did not really explain it in a detailed manner. What is it, and is this information vital to the course later down the line? Thank You!
Sun Oct 20, 2019 10:21 pm
Forum: Properties of Electrons
Topic: Electron Principles
Replies: 3
Views: 74

### Electron Principles

Can someone please explain to a greater depth the following: Hund’s Rule, Pauli Exclusion Principle, and Aufbau Principle? Thank you in advance.
Sun Oct 20, 2019 10:16 pm
Forum: Photoelectric Effect
Topic: Clarification on Photoelectric Effect
Replies: 3
Views: 88

### Clarification on Photoelectric Effect

During one of the lectures early last week, Dr. Lavelle discussed the idea of ejecting electrons from the host atom. However, he made a clarification stating that higher intensity does not guarantee the ejection of the electron. So if that’s not what is responsible, then what is? Dr. Lavelle glanced...
Sun Oct 20, 2019 10:13 pm
Forum: Photoelectric Effect
Topic: Chemistry Equations
Replies: 2
Views: 48

### Chemistry Equations

For this unit specifically, what are all of the chemistry equations and expressions that will be used, from the beginning high school level ones to the advanced ones near the end of this unit? Also, how do we know when to use specific chemistry equations, like the two chemistry equations that both e...