Search found 45 matches
- Sun Feb 16, 2020 10:38 pm
- Forum: Balancing Redox Reactions
- Topic: redox reactions
- Replies: 3
- Views: 321
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: 178
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: 329
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: 208
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: 139
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: 221
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: 445
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: 345
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: 155
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: 457
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: 126
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: 244
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: 666
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: 181
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: 228
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: 196
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: 341
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: 213
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: 263
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: 300
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: 449
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: 407
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: 323
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: 939
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: 309
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: 290
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: 339
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: 719
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: 427
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: 649
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: 379
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: 445
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: 356
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: 552
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: 393
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: 3442
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: 321
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: 1039
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: 390
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: 1669
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: 539
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: 145
- Views: 17285
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: 456
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: 333
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: 209
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?