## Search found 45 matches

Sun Feb 16, 2020 10:38 pm
Forum: Balancing Redox Reactions
Topic: redox reactions
Replies: 3
Views: 38

### redox reactions

What is the easiest way to distinguish whether something is being reduced or oxidized in a reaction?
Sun Feb 16, 2020 10:35 pm
Forum: Van't Hoff Equation
Topic: Van't Hoff Eq
Replies: 1
Views: 25

### Van't Hoff Eq

What must we know in order to use this equation?
Sun Feb 16, 2020 10:34 pm
Forum: Van't Hoff Equation
Topic: Van't Hoff Equation
Replies: 3
Views: 56

### Van't Hoff Equation

When do we know to use the Van't Hoff Equation?
Sun Feb 16, 2020 10:32 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: wmax = delta G
Replies: 1
Views: 40

### wmax = delta G

In my notes I have the expression "wmax = delta G." What exactly does this refer to?
Sun Feb 16, 2020 10:27 pm
Forum: Balancing Redox Reactions
Topic: split equations
Replies: 1
Views: 14

### split equations

Why exactly do we split reactions into two half reactions?
Sun Feb 02, 2020 11:31 pm
Forum: Calculating Work of Expansion
Topic: Reversible process
Replies: 2
Views: 37

### Reversible process

Why do we use integrals to find w?
Sun Feb 02, 2020 11:28 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: delta U
Replies: 9
Views: 78

### delta U

How do we find delta U?
Sun Feb 02, 2020 11:27 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: First Law
Replies: 5
Views: 71

### First Law

By "internal energy" of an isolated system is it referring to heat?
Sun Feb 02, 2020 11:18 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Changing a Closed System
Replies: 2
Views: 19

### Changing a Closed System

How do you change a closed system?
Sun Feb 02, 2020 11:17 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Types of Systems
Replies: 7
Views: 116

### Types of Systems

How do you determine is something is a closed system?
Sun Jan 26, 2020 5:23 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: no bond enthalpies
Replies: 1
Views: 23

### no bond enthalpies

If no bond enthalpies are available, how can one calculate the standard reaction enthalpy?
Sun Jan 26, 2020 5:21 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies
Replies: 3
Views: 35

### Bond Enthalpies

How do we use bond enthalpies to calculate change of enthalpy?
Sun Jan 26, 2020 5:19 pm
Forum: Phase Changes & Related Calculations
Topic: Steam Burns
Replies: 9
Views: 116

### Steam Burns

Does anyone remember how Lavelle explained that steam causes more severe burns?
Sun Jan 26, 2020 5:16 pm
Forum: Phase Changes & Related Calculations
Topic: State Properties
Replies: 3
Views: 29

### State Properties

What are some examples of state properties?
Sun Jan 26, 2020 5:13 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's Law
Replies: 4
Views: 29

### Hess's Law

Which method is the least accurate?
Mon Jan 20, 2020 12:42 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: X approx check
Replies: 2
Views: 34

### X approx check

Is it mandatory to check the x approximation on a test?
Sun Jan 19, 2020 4:40 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Homework problem 5.I.15
Replies: 4
Views: 69

### Homework problem 5.I.15

For this problem I got the correct answer without using an ICE table, but when I looked at the solutions they used one. Would we get marked off for that on the test?
Mon Jan 13, 2020 9:30 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: HW 5I.13
Replies: 1
Views: 37

### HW 5I.13

Can anyone go into detail on the algebra for this problem? I did the ice table, but small errors in my arithmetic continue give me the wrong answer.
Sun Jan 12, 2020 5:32 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kp and Kc
Replies: 4
Views: 68

### Kp and Kc

If Kp is used for partial pressure and Kc is used for concentration, can there ever be an instance in which a reaction has both aq and g? If not, why not? If so, would you use Kc or Kp?
Sun Jan 12, 2020 5:21 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: the "quick way"
Replies: 4
Views: 51

### the "quick way"

Could someone explain the "quick way" Dr. Lavelle described in lecture when talking about changes in pressure? What are the circumstances in which it can be used?
Sun Jan 12, 2020 5:18 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's Principle
Replies: 5
Views: 69

### Le Chatelier's Principle

This principle applies to changing what physical parameters?
Sun Jan 12, 2020 5:15 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Reaction Q
Replies: 7
Views: 74

### Reaction Q

What does the reaction quotient tell us about the reaction?
Sun Jan 12, 2020 5:12 pm
Forum: Ideal Gases
Topic: ICE tables
Replies: 4
Views: 53

### ICE tables

When do we use an ICE table? How do we use one?
Sun Dec 02, 2018 11:58 pm
Forum: Bronsted Acids & Bases
Topic: Ka Formula
Replies: 6
Views: 253

### Ka Formula

What do we need to know about the Ka formula? How is it used?
Sun Dec 02, 2018 11:51 pm
Forum: Bronsted Acids & Bases
Topic: Calculating pH
Replies: 2
Views: 150

### Calculating pH

How would we calculate the pH of a strong acid?
Sun Dec 02, 2018 11:43 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand Names
Replies: 2
Views: 114

### Ligand Names

Are we supposed to have ligand names memorized?
Sun Nov 25, 2018 11:49 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sigma and Pi Bonds
Replies: 3
Views: 152

### Sigma and Pi Bonds

Which bond allows bound atoms to rotate?
Sun Nov 25, 2018 11:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR
Replies: 9
Views: 311

### VSEPR

What type of bonding has the greatest repulsion strength?
Sun Nov 25, 2018 11:30 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR model
Replies: 4
Views: 170

### VSEPR model

What does the "A", "X", and "E" tell us about how the model should look?
Wed Nov 14, 2018 8:04 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape
Replies: 6
Views: 216

### Molecular Shape

One of the homework problems (#9 sixth edition) asks for the shape of ICl3, where iodine is the central atom. I thought the shape would be trigonal planar, but I see that the correct answer is t-shaped. What makes it t-shaped instead of trigonal planar?
Sun Nov 11, 2018 10:19 pm
Forum: Ionic & Covalent Bonds
Topic: Bonding
Replies: 2
Views: 161

### Bonding

I'm a little confused because I know that larger atoms have a larger distance and longer bond length, making them weaker bonds. However, I also have in my notes that increasing size or molar mass causes stronger interactions. Wouldn't stronger interactions mean a stronger bond?
Sun Nov 11, 2018 10:07 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic Bonds with Covalent Character
Replies: 3
Views: 172

### Ionic Bonds with Covalent Character

Ionic bonds having covalent character is due to the partially positive and negative charges right? For example, NaCl.
Sun Nov 11, 2018 9:51 pm
Forum: Bond Lengths & Energies
Topic: hydrogen bonds
Replies: 3
Views: 138

### hydrogen bonds

Why do hydrogen bonds yield melting points?
Sun Nov 04, 2018 11:45 pm
Forum: Quantum Numbers and The H-Atom
Topic: Test Quantum Numbers
Replies: 4
Views: 235

### Test Quantum Numbers

How many electrons in a given atom can have quantum numbers with n=5, l=1?
Sun Nov 04, 2018 11:30 pm
Forum: Lewis Structures
Topic: Extra electrons
Replies: 3
Views: 163

### Extra electrons

When drawing extra electrons in the Lewis Structure, what is the maximum number of electrons you can add to an element with an extended octet?
Sun Nov 04, 2018 11:02 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge Equation
Replies: 13
Views: 2795

### Formal Charge Equation

What is the shortcut for the formal charge equation?
Sun Oct 28, 2018 10:51 pm
Forum: Lewis Structures
Topic: Electron Configurations
Replies: 3
Views: 131

### Electron Configurations

For Cu 2+, why does {Ar} 3d^10 4s^1 become [Ar] 3d^9
Sun Oct 28, 2018 10:41 pm
Forum: Lewis Structures
Topic: Lewis Structures
Replies: 13
Views: 382

### Lewis Structures

How did Professor Lavelle say to choose the atom that belongs in the center of the Lewis Structure?
Sun Oct 28, 2018 10:30 pm
Forum: Quantum Numbers and The H-Atom
Topic: Degeneracy
Replies: 3
Views: 163

### Degeneracy

What does the term "degenerate" mean in relation to quantum numbers?
Mon Oct 15, 2018 12:22 am
Forum: Properties of Light
Topic: Colors and Frequency
Replies: 14
Views: 788

### Re: Colors and Frequency

I think I heard someone ask this question in lecture and he said that he doesn't expect us to memorize it now, but it sounded like we may need to be more familiar with it later.
Mon Oct 15, 2018 12:20 am
Forum: Properties of Light
Topic: Light Intensity
Replies: 4
Views: 289

### Light Intensity

What happens if the energy per photon is greater than the energy needed to remove an electron?
Mon Oct 15, 2018 12:05 am
Forum: Student Social/Study Group
Topic: Note Taking
Replies: 32
Views: 2488

### Re: Note Taking

Handwritten works best for me because I feel like it helps to get used to writing out the notation as you would have to do on a test. I also try to make an effort of keeping things neat and spaced out so that when I refer back to my notes it's legible.
Thu Oct 04, 2018 5:19 pm
Forum: Molarity, Solutions, Dilutions
Topic: Q E27
Replies: 4
Views: 204

### Q E27

Did anyone know how to find part A. I got part B but there's a step I'm missing because I have no idea where the answer from part A comes from.
Thu Oct 04, 2018 2:43 pm
Forum: Molarity, Solutions, Dilutions
Topic: Q E14
Replies: 2
Views: 139

### Q E14

This question gives us the molar mass metal hydroxide M(OH)2 is 74.10 g/mol. Then it asks what the molar mass of the sulfide of this metal. Sounds simple, but I'm confused on where the sulfide comes from. Anyone know what it means?
Thu Oct 04, 2018 2:27 pm
Forum: Molarity, Solutions, Dilutions
Topic: Q L7
Replies: 1
Views: 88

### Q L7

I'm not sure how to go about solving part B. "What mass of oxygen is needed to oxidize this amount of tristearin?