Search found 30 matches

by VGonzalez
Mon Dec 03, 2018 1:08 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Ka Calculations
Replies: 3
Views: 44

Ka Calculations

Is Pka something we will have to calculate or will it be given?
by VGonzalez
Mon Dec 03, 2018 1:06 pm
Forum: Naming
Topic: Ch. 17 #29, 6th edition
Replies: 1
Views: 26

Ch. 17 #29, 6th edition

Can someone please explain how the naming reflects the oxidation number?
by VGonzalez
Mon Dec 03, 2018 1:05 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ch. 17#33, 6th edition
Replies: 1
Views: 39

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?
by VGonzalez
Mon Dec 03, 2018 1:02 pm
Forum: Conjugate Acids & Bases
Topic: Ch. 12 #3; 6th edition
Replies: 1
Views: 26

Ch. 12 #3; 6th edition

When it says to write the proton transfer equilibria in an aqueous solution does that just mean water?
by VGonzalez
Mon Dec 03, 2018 12:59 pm
Forum: *Molecular Orbital Theory Applied To Transition Metals
Topic: Ch. 17 #35; 6th edition
Replies: 1
Views: 70

Ch. 17 #35; 6th edition

What exactly is a chelating complex and how can you tell if an isomer can form one?
by VGonzalez
Mon Dec 03, 2018 12:57 pm
Forum: Lewis Acids & Bases
Topic: Lewis vs. Bronsted
Replies: 5
Views: 70

Lewis vs. Bronsted

Does anyone have any tips/mnemonic devices on remembering the difference between a Lewis acid/base and a Bronsted acid/base?
by VGonzalez
Mon Nov 26, 2018 3:01 pm
Forum: Hybridization
Topic: Hybridization & Types of Bonds [ENDORSED]
Replies: 3
Views: 59

Hybridization & Types of Bonds [ENDORSED]

How do you know how many pi and sigma bonds are present based on a compound's hybridization?
by VGonzalez
Mon Nov 26, 2018 2:58 pm
Forum: Dipole Moments
Topic: Homework Question 4.29, 6th edition
Replies: 2
Views: 66

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?
by VGonzalez
Mon Nov 26, 2018 2:56 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Oxidation
Replies: 2
Views: 51

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 #?
by VGonzalez
Wed Nov 14, 2018 2:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 3
Views: 50

Bond Angles

Will we be asked for bond angles on shapes like trigonal pyramidal? Should we just memorize the generic angles of 109.5?
by VGonzalez
Wed Nov 14, 2018 2:39 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Homework Question 4.1 (6th edition)
Replies: 4
Views: 106

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...
by VGonzalez
Wed Nov 14, 2018 2:36 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Formula
Replies: 1
Views: 44

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?
by VGonzalez
Thu Nov 08, 2018 1:25 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Electronegativity
Replies: 6
Views: 89

Electronegativity

Since F is the most electronegative element, what is more electronegative: Oxygen or Chlorine?
by VGonzalez
Thu Nov 08, 2018 1:23 pm
Forum: Dipole Moments
Topic: Interaction Potential Energy
Replies: 4
Views: 75

Interaction Potential Energy

Will we actually be using the equation or is It just a reference?
by VGonzalez
Thu Nov 08, 2018 1:22 pm
Forum: Lewis Structures
Topic: Mystery Element
Replies: 4
Views: 98

Mystery Element

How do you decide what the center element will be to complete a Lewis Structure?
by VGonzalez
Thu Nov 01, 2018 6:53 pm
Forum: Octet Exceptions
Topic: Valence Electrons
Replies: 1
Views: 48

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?
by VGonzalez
Thu Nov 01, 2018 6:51 pm
Forum: Student Social/Study Group
Topic: Bond Length
Replies: 1
Views: 53

Bond Length

Do we need to know how to calculate bond length for upcoming tests?
by VGonzalez
Thu Nov 01, 2018 6:50 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Lecture 1 Example
Replies: 2
Views: 43

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?
by VGonzalez
Thu Oct 25, 2018 4:48 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Affinty
Replies: 2
Views: 91

Electron Affinty

What exactly is electron affinity and what does it say about an element?
by VGonzalez
Thu Oct 25, 2018 4:46 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Losing electrons to form cations
Replies: 2
Views: 88

Losing electrons to form cations

How do you know from what orbital an electron will be lost in order to form a cation?
by VGonzalez
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: 107

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?
by VGonzalez
Thu Oct 18, 2018 1:02 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Nodes/ Nodals
Replies: 2
Views: 34

Nodes/ Nodals

Why is the probability of finding an electron at a nodal 0?
by VGonzalez
Thu Oct 18, 2018 12:59 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Equation
Replies: 3
Views: 51

Rydberg Equation

Are we not allowed to use the Rydberg Equation at all? Do we need to know it for the upcoming test/quiz?
by VGonzalez
Mon Oct 15, 2018 1:18 pm
Forum: Photoelectric Effect
Topic: Homework Ch. 1 Question 25; 6th Edition
Replies: 4
Views: 148

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?
by VGonzalez
Thu Oct 11, 2018 4:14 pm
Forum: *Black Body Radiation
Topic: The Importance of Black Body Radiation (?)
Replies: 5
Views: 204

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?
by VGonzalez
Thu Oct 11, 2018 4:11 pm
Forum: Einstein Equation
Topic: Question 9; 6th edition
Replies: 3
Views: 53

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.
by VGonzalez
Thu Oct 11, 2018 4:07 pm
Forum: Properties of Light
Topic: Homework Question 3; 6th Edition
Replies: 2
Views: 53

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?
by VGonzalez
Wed Oct 03, 2018 1:36 pm
Forum: Empirical & Molecular Formulas
Topic: F5 (6TH EDITION)
Replies: 5
Views: 116

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?
by VGonzalez
Wed Oct 03, 2018 1:30 pm
Forum: Empirical & Molecular Formulas
Topic: When to double moles
Replies: 13
Views: 177

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?
by VGonzalez
Wed Oct 03, 2018 1:22 pm
Forum: Limiting Reactant Calculations
Topic: Limiting Reactants
Replies: 2
Views: 47

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?

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