Search found 30 matches
- Mon Dec 03, 2018 1:08 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Ka Calculations
- Replies: 3
- Views: 339
Ka Calculations
Is Pka something we will have to calculate or will it be given?
- Mon Dec 03, 2018 1:06 pm
- Forum: Naming
- Topic: Ch. 17 #29, 6th edition
- Replies: 1
- Views: 207
Ch. 17 #29, 6th edition
Can someone please explain how the naming reflects the oxidation number?
- Mon Dec 03, 2018 1:05 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ch. 17#33, 6th edition
- Replies: 1
- Views: 207
Ch. 17#33, 6th edition
How do you know if something will form a ligand and if it will be mono-,bi-, and tri- dente?
- Mon Dec 03, 2018 1:02 pm
- Forum: Conjugate Acids & Bases
- Topic: Ch. 12 #3; 6th edition
- Replies: 1
- Views: 190
Ch. 12 #3; 6th edition
When it says to write the proton transfer equilibria in an aqueous solution does that just mean water?
- Mon Dec 03, 2018 12:59 pm
- Forum: *Molecular Orbital Theory Applied To Transition Metals
- Topic: Ch. 17 #35; 6th edition
- Replies: 1
- Views: 4992
Ch. 17 #35; 6th edition
What exactly is a chelating complex and how can you tell if an isomer can form one?
- Mon Dec 03, 2018 12:57 pm
- Forum: Lewis Acids & Bases
- Topic: Lewis vs. Bronsted
- Replies: 5
- Views: 4022
Lewis vs. Bronsted
Does anyone have any tips/mnemonic devices on remembering the difference between a Lewis acid/base and a Bronsted acid/base?
- Mon Nov 26, 2018 3:01 pm
- Forum: Hybridization
- Topic: Hybridization & Types of Bonds [ENDORSED]
- Replies: 3
- Views: 369
Hybridization & Types of Bonds [ENDORSED]
How do you know how many pi and sigma bonds are present based on a compound's hybridization?
- Mon Nov 26, 2018 2:58 pm
- Forum: Dipole Moments
- Topic: Homework Question 4.29, 6th edition
- Replies: 2
- Views: 293
Homework Question 4.29, 6th edition
How from diagram pictures, are we able tell what is polar and non polar and what compound has the greatest dipole moment?
- Mon Nov 26, 2018 2:56 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Oxidation
- Replies: 2
- Views: 316
Oxidation
In today's lecture, Dr. Lavelle talked about being able to tell oxidation states. How can you tell the oxidation state from the # of ligands or the coordination #?
- Wed Nov 14, 2018 2:42 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 3
- Views: 342
Bond Angles
Will we be asked for bond angles on shapes like trigonal pyramidal? Should we just memorize the generic angles of 109.5?
- Wed Nov 14, 2018 2:39 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Homework Question 4.1 (6th edition)
- Replies: 4
- Views: 792
Homework Question 4.1 (6th edition)
Q: Below are ball-and-stick models of two molecules. In each case, indicate whether there must be, may be, or cannot be one or more lone pairs of electrons on the central atom. 120° (a) 180° (b) How do you know if there can be lone pairs of electrons on the central atom? Wouldn't it be another shape...
- Wed Nov 14, 2018 2:36 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR Formula
- Replies: 1
- Views: 232
VSEPR Formula
What is the VSPER Formula that homework questions 4.11, 4.13, 4.15 (6th edition) ask to write? Is it important to know?
- Thu Nov 08, 2018 1:25 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Electronegativity
- Replies: 6
- Views: 656
Electronegativity
Since F is the most electronegative element, what is more electronegative: Oxygen or Chlorine?
- Thu Nov 08, 2018 1:23 pm
- Forum: Dipole Moments
- Topic: Interaction Potential Energy
- Replies: 4
- Views: 382
Interaction Potential Energy
Will we actually be using the equation or is It just a reference?
- Thu Nov 08, 2018 1:22 pm
- Forum: Lewis Structures
- Topic: Mystery Element
- Replies: 4
- Views: 521
Mystery Element
How do you decide what the center element will be to complete a Lewis Structure?
- Thu Nov 01, 2018 6:53 pm
- Forum: Octet Exceptions
- Topic: Valence Electrons
- Replies: 1
- Views: 220
Valence Electrons
Do the expectations to the octet rule follow the ionization rules? Like if an element has 4s3d will 4s ionize first or will 3d ionize first?
- Thu Nov 01, 2018 6:51 pm
- Forum: Student Social/Study Group
- Topic: Bond Length
- Replies: 1
- Views: 210
Bond Length
Do we need to know how to calculate bond length for upcoming tests?
- Thu Nov 01, 2018 6:50 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Lecture 1 Example
- Replies: 2
- Views: 293
Lecture 1 Example
In Monday's lecture we did an example with a nitrate ion. Dr. Lavelle wrote how many valence electrons there were in Nitrogen and Oxygen and then he wrote -1 charge. Why did he write the -1 charge? Is that the value we have to calculate with the formal charge equation?
- Thu Oct 25, 2018 4:48 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Affinty
- Replies: 2
- Views: 337
Electron Affinty
What exactly is electron affinity and what does it say about an element?
- Thu Oct 25, 2018 4:46 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Losing electrons to form cations
- Replies: 2
- Views: 322
Losing electrons to form cations
How do you know from what orbital an electron will be lost in order to form a cation?
- Tue Oct 23, 2018 2:10 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Homework Ch.2 Question 15, 6th Edition
- Replies: 6
- Views: 433
Homework Ch.2 Question 15, 6th Edition
How many (a) nodal planes, (b) radial nodes are there in a 3p-orbital?
Is there a way to tell how many nodal planes and radial nodes there are based on an electron state?
What exactly are radial nodes?
Is there a way to tell how many nodal planes and radial nodes there are based on an electron state?
What exactly are radial nodes?
- Thu Oct 18, 2018 1:02 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Nodes/ Nodals
- Replies: 2
- Views: 225
Nodes/ Nodals
Why is the probability of finding an electron at a nodal 0?
- Thu Oct 18, 2018 12:59 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg Equation
- Replies: 3
- Views: 317
Rydberg Equation
Are we not allowed to use the Rydberg Equation at all? Do we need to know it for the upcoming test/quiz?
- Mon Oct 15, 2018 1:18 pm
- Forum: Photoelectric Effect
- Topic: Homework Ch. 1 Question 25; 6th Edition
- Replies: 4
- Views: 557
Homework Ch. 1 Question 25; 6th Edition
In a previous posting from some time ago students said to answer parts b and c by multiplying the energy received in part a by the amount of atoms you get from the given masses. Why is this allowed? How do we know that multiplying the number of atoms by the energy will give the correct new energy?
- Thu Oct 11, 2018 4:14 pm
- Forum: *Black Body Radiation
- Topic: The Importance of Black Body Radiation (?)
- Replies: 5
- Views: 815
The Importance of Black Body Radiation (?)
In Monday's notes we wrote that the description if light as photons explains the intensity profile of black body radiation but have yet to talk about it again. Are we supposed to know the concept/definition of black body radiation? Is there any importance or significance to black body radiation?
- Thu Oct 11, 2018 4:11 pm
- Forum: Einstein Equation
- Topic: Question 9; 6th edition
- Replies: 3
- Views: 354
Question 9; 6th edition
Not sure if I am posting in the right section, but what are the standard units for frequency and wavelength given by the equations. The chart has a wavelength in nanometers and Dr. Lavelle did an example on Wednesday also with nanometers but I thought meters was standard.
- Thu Oct 11, 2018 4:07 pm
- Forum: Properties of Light
- Topic: Homework Question 3; 6th Edition
- Replies: 2
- Views: 126
Homework Question 3; 6th Edition
What does the phrase "The extent of the change in the electrical field at a given point decreases" really mean. Is it referring to the relation of energy to frequency?
- Wed Oct 03, 2018 1:36 pm
- Forum: Empirical & Molecular Formulas
- Topic: F5 (6TH EDITION)
- Replies: 5
- Views: 495
F5 (6TH EDITION)
The problem asks for the mass percent composition of L-carritine, C7H15NO3. Does that just mean find the mass composition of each element?
- Wed Oct 03, 2018 1:30 pm
- Forum: Empirical & Molecular Formulas
- Topic: When to double moles
- Replies: 13
- Views: 989
When to double moles
When do you know to double moles or multiply an answer to get the next whole number. In the lecture we had to multiply 1.33 by 3 but if a number is like 1.1 or 1.9 do we still have to or can we round it? Are there any general rules?
- Wed Oct 03, 2018 1:22 pm
- Forum: Limiting Reactant Calculations
- Topic: Limiting Reactants
- Replies: 2
- Views: 192
Limiting Reactants
In the class example involving solid calcium carbide to form ethyne gas Mr. Lavelle wrote that 1.56 moles of calcium carbide requires 3.12 moles of water. What does this mean? Is it just about getting to the closest whole number? Does it have any affect on solving the problem?