Search found 34 matches

by Aj1156
Sun Dec 09, 2018 9:49 am
Forum: Lewis Acids & Bases
Topic: Identifying Acids and Bases
Replies: 5
Views: 261

Identifying Acids and Bases

I get that lewis acids are electron acceptors and lewis bases are electron donors but say you had an ion such as F-

Would F- be a lewis acid or a lewis base? Because it has a full octet id assume lewis base but i’m not sure
by Aj1156
Sun Dec 09, 2018 9:41 am
Forum: Conjugate Acids & Bases
Topic: Stability of Conjugate Base
Replies: 6
Views: 270

Re: Stability of Conjugate Base

How can you tell base when a base is stable?
by Aj1156
Sat Dec 08, 2018 5:01 pm
Forum: Lewis Acids & Bases
Topic: Acids & Bases we need to memorize
Replies: 1
Views: 39

Acids & Bases we need to memorize

Does anyone know the strong acids and bases / weak acids and bases we should have memorized? If you could provide a list that’d be awesome
by Aj1156
Wed Dec 05, 2018 2:24 pm
Forum: Bronsted Acids & Bases
Topic: Withdrawing e- density
Replies: 1
Views: 51

Withdrawing e- density

Can someone explain to me what withdrawing electron density is? What exactly does that mean?

I know it has something to do with EN
by Aj1156
Sun Dec 02, 2018 8:40 pm
Forum: Naming
Topic: Latin prefixes
Replies: 3
Views: 61

Latin prefixes

Do we need to know how to name ions based on their Latin root for naming the compound?

For instance, that Fe (II) and Fe (III) are ferrous and ferric?
by Aj1156
Sun Dec 02, 2018 8:39 pm
Forum: Naming
Topic: Naming Question
Replies: 5
Views: 92

Naming Question

For the coordination compound [FeCl(OH2)5]+

What would the charge be of Fe? Can someone please also explain the charge of each atom or molecule?
by Aj1156
Sun Dec 02, 2018 3:42 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: How to determine coordination number
Replies: 3
Views: 63

How to determine coordination number

Is the coordination number equivalent to the number of ligands attached to the central metal atom?
by Aj1156
Tue Nov 27, 2018 2:36 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: maximizing dipole interactions
Replies: 1
Views: 39

maximizing dipole interactions

Why does positioning dipoles with oppositely charged closest to each other maximize dipole interactions ?
by Aj1156
Tue Nov 27, 2018 12:33 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: 3F.1 (Seventh Edition)
Replies: 2
Views: 65

3F.1 (Seventh Edition)

Can someone walk me through how you would answer this question:

"Identify the types of attractive intermolecular interactions that might arise between molecules of NH2OH"
by Aj1156
Sun Nov 25, 2018 10:43 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Distinguishing between the different intermolecular forces
Replies: 8
Views: 184

Distinguishing between the different intermolecular forces

How do you know which intermolecular forces are present in a molecule?

I know that the London forces are present in every molecule, but how do you determine which other forces are present? Is it by the amount of energy in a given molecule?
by Aj1156
Sun Nov 25, 2018 10:42 am
Forum: Lewis Structures
Topic: Exceptions to the Octet Rule
Replies: 5
Views: 107

Exceptions to the Octet Rule

What are the exceptions to the Octet rule that we need to be aware of?
by Aj1156
Sun Nov 25, 2018 10:41 am
Forum: Dipole Moments
Topic: What are dipole moments used for?
Replies: 3
Views: 80

What are dipole moments used for?

What do dipole moments tell you about a molecule and what are they used for?

From what I gathered, dipole movements distinguish the type of intermolecular forces between atoms. These intermolecular forces are then used to determine the phase of a molecule.

Is this correct?
by Aj1156
Thu Nov 15, 2018 5:15 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Double Bonds in VSEPR
Replies: 5
Views: 71

Re: Double Bonds in VSEPR

When using the VSEPR model, you want to take into account regions of electron density. So if you have 4 atoms surrounding a central atom and one of the atoms has a double bond you would still have 4 regions of electron density, not 5.
by Aj1156
Thu Nov 15, 2018 5:13 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: Polar and Dipole
Replies: 3
Views: 80

Re: Polar and Dipole

Can someone please explain what polar power is? How does it differ between anions and cations?
by Aj1156
Thu Nov 15, 2018 5:12 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: Hydrogen Bonding
Replies: 5
Views: 117

Hydrogen Bonding

Could someone give me an overview of what hydrogen bonding is and when it is used? I can't find a section on it in the textbook and I am a bit lost
by Aj1156
Tue Nov 13, 2018 1:01 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
Replies: 135
Views: 28288

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]

Thank you again! These are always so helpful. When will you be posting the answer key to worksheet 6?
by Aj1156
Sun Nov 11, 2018 8:18 pm
Forum: Ionic & Covalent Bonds
Topic: Bond Strength
Replies: 2
Views: 111

Bond Strength

Why do lone pairs on neighboring atoms weaken the bond between them?

Do lone pairs push the atoms farther apart?
by Aj1156
Sun Nov 11, 2018 12:49 pm
Forum: Ionic & Covalent Bonds
Topic: Determining ionic character vs covalent
Replies: 3
Views: 66

Determining ionic character vs covalent

To calculate the difference in electro negativity such as PCl3 would you simply do (electronegativity of P) - (electronegstivity of Cl) or would you do (electronegativity of P) - (3 x electronegstivity of Cl)
by Aj1156
Sun Nov 11, 2018 8:43 am
Forum: Dipole Moments
Topic: Dipoles and Molarity
Replies: 2
Views: 121

Re: Dipoles and Molarity

polarity is a separation of electric charge leading to a molecule or its chemical groups having an electric dipole moment, with a negatively charged end and a positively charged end.


When a molecule has no dipoles, it is nonpolar. Conversely, when a molecule has dipoles it is polar.
by Aj1156
Sun Nov 04, 2018 12:38 pm
Forum: Lewis Structures
Topic: Identifying the central atom in ONF
Replies: 3
Views: 63

Identifying the central atom in ONF

How would you determine the central atom in a molecule such as ONF?

Because oxygen has the lowest ionization energy wouldn’t it be oxygen not nitrogen? Why is the central atom N?
by Aj1156
Sat Nov 03, 2018 1:39 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Ground state
Replies: 2
Views: 46

Ground state

How can you tell when an ion has a lower electron configuration than the neutral atom and vice versa? My question comes up after I did 2A.5 “Give the ground stage electron configuration expected for each of the following ions: Cu+, Bi3+, Ga3+, and TI3+ At first i thought I simply had to write the el...
by Aj1156
Thu Nov 01, 2018 9:12 pm
Forum: Electronegativity
Topic: What are the trends useful for?
Replies: 12
Views: 158

What are the trends useful for?

When would you use the IE, EN, EA, and AR trends?
by Aj1156
Thu Nov 01, 2018 9:11 pm
Forum: Electronegativity
Topic: Trends in EN and IE
Replies: 1
Views: 37

Trends in EN and IE

Why is it that ionization energy increases from left to right? I know it has something to do with more attraction pulling the electrons toward the interior, but I would like a more thorough understanding.

Why does EN energy increase from left to right?
by Aj1156
Thu Nov 01, 2018 9:08 pm
Forum: Lewis Structures
Topic: d orbitals in valence shell that accommodate additional e-
Replies: 2
Views: 32

d orbitals in valence shell that accommodate additional e-

In class Wednesday Dr. Lavelle mentioned that atoms in period 3 or higher have d-orbitals in valence shell that accommodate additional e- and used PCl5 as an example. Can someone explain why and what he meant by this? It kind of went over my head in class.
by Aj1156
Wed Oct 24, 2018 2:04 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Online Modules
Replies: 4
Views: 130

Online Modules

Does anyone know if Dr. Lavelle will be posting online modules for chapter 2?
by Aj1156
Mon Oct 22, 2018 1:23 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectra Module 41
Replies: 1
Views: 30

Atomic Spectra Module 41

For the hydrogen atom which statement is true? A) The transition from n=5 to n=3 involves greater energy than one from n=4 to n=2 B) The transition from n=4 emits radiation of longer wavelength than the transition from n=5 to n=1 C) All transitions from states for which n > 1 to the n=1 involve the ...
by Aj1156
Sun Oct 21, 2018 9:25 pm
Forum: Quantum Numbers and The H-Atom
Topic: Difference between ground and excited state of electrons
Replies: 4
Views: 94

Difference between ground and excited state of electrons

How can you tell the difference between ground state and excited state?
by Aj1156
Sun Oct 21, 2018 9:21 pm
Forum: Quantum Numbers and The H-Atom
Topic: Zeffe type of questions
Replies: 1
Views: 57

Zeffe type of questions

Do we need to know how to solve problems asking about the effective nuclear charge? If so, what is Zeffe?
by Aj1156
Thu Oct 11, 2018 8:04 pm
Forum: Properties of Electrons
Topic: Emission vs Absorption
Replies: 4
Views: 82

Emission vs Absorption

When an atom absorbs a specific wavelength does that mean that an electron moves from a higher energy state to ground state

or is it that when an atom absorbs a specific wavelength they move from ground state to a higher energy state?
by Aj1156
Thu Oct 11, 2018 1:12 pm
Forum: Photoelectric Effect
Topic: Photoelectric effect Module 32
Replies: 1
Views: 46

Photoelectric effect Module 32

32. Molybdenum metal must absorb radiation with a minimum frequency of 1.09 x 1015 s-1 before it can emit an electron from its surface. Answer the following two questions. What is the minimum energy needed to produce this effect? Is the wording of this questioning indicate that you need to find the ...
by Aj1156
Thu Oct 11, 2018 1:09 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Bohr frequency condition
Replies: 2
Views: 164

Re: Bohr frequency condition

Bohr's frequency condition is delta E=hv, meaning the difference in energy (when a high energy e- drops to a lower energy e- level) is equal to Planck's constant x frequency.
by Aj1156
Tue Oct 09, 2018 2:33 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E29 Part D
Replies: 2
Views: 147

E29 Part D

A chemist measured out 8.61 g of copper (II) chloride tetrahydrate CuCl2 4H20 (d) What fraction of the total mass of the sample is due to oxygen? What would be the proper conversion to find the fraction of the mass due to oxygen in the total sample? I tried 8.61g CuCl2 4H20 / 206.45 x 1m/4m x 16g bu...

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