Search found 27 matches

by cassidysong 1E
Tue Nov 05, 2019 11:21 am
Forum: Lewis Structures
Topic: 2B.1 c
Replies: 2
Views: 17

2B.1 c

For the molecule ONF, how do you know which molecule should go in the middle? Generally the element with the lowest ionization energy is the central atom but doesn't oxygen have a lower ionization energy because it's more favorable to have 3 electrons in the 2d shell, so why is nitrogen the central ...
by cassidysong 1E
Tue Nov 05, 2019 10:58 am
Forum: Resonance Structures
Topic: resonance importance?
Replies: 7
Views: 30

resonance importance?

I know that a resonant structure lowers the energy of a molecule to make it more stable but I don't really understand why having a mixture of structures help lowers the energy. Any insight would be helpful
by cassidysong 1E
Sun Nov 03, 2019 10:05 pm
Forum: Quantum Numbers and The H-Atom
Topic: 1D.21
Replies: 2
Views: 20

Re: 1D.21

For reference for l,
l=0 ---> s orbital
l=1 ---> p orbital
l=2 ---> d orbital
l=3 ---> f orbital (we don't really need to know this)
the principal quantum number, n, just needs to be in the front so,
n=5 l=2 ---> 5d
n=1 l=0 ---> 1s
n=6 l=3 ---> 6f
n=2 l=1 ---> 2p
by cassidysong 1E
Sun Nov 03, 2019 9:59 pm
Forum: *Shrodinger Equation
Topic: ?
Replies: 2
Views: 42

Re: ?

ψ describes the system mathematically
by cassidysong 1E
Sun Nov 03, 2019 9:56 pm
Forum: Bond Lengths & Energies
Topic: Why Are Double Bonds Shorter
Replies: 16
Views: 107

Re: Why Are Double Bonds Shorter

^^^ more electrons have more pull and make the bond shorter
by cassidysong 1E
Sun Nov 03, 2019 9:54 pm
Forum: Bond Lengths & Energies
Topic: Chemical Bonds
Replies: 4
Views: 23

Re: Chemical Bonds

^^ atoms become more stable with bonds
by cassidysong 1E
Sun Nov 03, 2019 9:52 pm
Forum: Bond Lengths & Energies
Topic: Does bond length have any effects?
Replies: 5
Views: 12

Re: Does bond length have any effects?

Yes, shorter bonds require more energy to break; double bonds and triple bonds are shorter than single bonds and therefore need more energy to break.
by cassidysong 1E
Sun Oct 27, 2019 7:57 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 4
Views: 155

Re: Formal Charge

In making a lewis dot structure you first think about the octet rule and then adjust the structure to have a better formal charge.
by cassidysong 1E
Sun Oct 27, 2019 7:56 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge vs octet rule
Replies: 5
Views: 272

Re: Formal charge vs octet rule

What people above me said: it is better to be more stable if it is below period 3.
by cassidysong 1E
Sun Oct 27, 2019 7:51 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge Formula
Replies: 5
Views: 24

Re: Formal Charge Formula

Shared electrons are the electrons that are represented by the line in a lewis dot structure. Each line counts as 2 electrons.
by cassidysong 1E
Sun Oct 27, 2019 7:47 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Central atom
Replies: 8
Views: 79

Re: Central atom

What the people of above me said :). The center atom's formal charge may not always be zero, if there is a choice between an outer atom with a formal charge of zero and the center atom with zero than it is best to have the center atom with zero.
by cassidysong 1E
Sun Oct 27, 2019 7:43 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Lowering Formal Charge
Replies: 6
Views: 34

Re: Lowering Formal Charge

The goal is to minimize formal charge overall but if it comes down to minimizing the formal charge on one of the outer atoms at the expense of the center atom's formal charge increasing than it's better to have the center atom with the lowest possible formal charge.
by cassidysong 1E
Sat Oct 19, 2019 10:43 pm
Forum: Properties of Electrons
Topic: Intensity vs. Energy
Replies: 10
Views: 53

Re: Intensity vs. Energy

intensity depends on the amplitude of the wavelength and is directly related to the amount of photons while energy is related to if there is enough energy for the electron to be ejected.
by cassidysong 1E
Sat Oct 19, 2019 10:39 pm
Forum: Properties of Electrons
Topic: x,y,z for Electrons
Replies: 10
Views: 57

Re: x,y,z for Electrons

x, y, z, refers to the different planes that electrons are on
by cassidysong 1E
Sat Oct 19, 2019 10:34 pm
Forum: Properties of Electrons
Topic: Electron structures
Replies: 2
Views: 19

Re: Electron structures

^^ what they said. There's no technical rule but people usually just fill it in left to right.
by cassidysong 1E
Sat Oct 19, 2019 10:33 pm
Forum: Properties of Electrons
Topic: Aufbau vs Hund's
Replies: 2
Views: 23

Re: Aufbau vs Hund's

Hund's principle states that every orbital in a subshell will be occupied with one electron before any one orbital is doubly occupied. Whereas Aufbau's principle states that lower energy orbitals fill before higher energy orbitals so that orbitals in the n=1 energy level will fill before the n=2 ene...
by cassidysong 1E
Sat Oct 19, 2019 10:22 pm
Forum: Administrative Questions and Class Announcements
Topic: Saying Thank You to Dr. Lavelle
Replies: 209
Views: 97945

Re: Saying Thank You to Dr. Lavelle

Thank you Dr. Lavelle for all of your instruction. Your passion for not only the subject of chemistry but the well-being of your students is palpable. Thank you for applying chemistry principles to a lab setting in order for us to understand the importance of every chemistry concept we learn.
by cassidysong 1E
Sun Oct 13, 2019 1:57 pm
Forum: Properties of Light
Topic: e=hv
Replies: 7
Views: 31

Re: e=hv

Yes it was derived from the photoelectric experiment.
by cassidysong 1E
Sun Oct 13, 2019 1:47 pm
Forum: Properties of Light
Topic: difference between Rydberg equation and De Broglie equation
Replies: 5
Views: 23

Re: difference between Rydberg equation and De Broglie equation

The De Broglie equation is to find the wavelength of matter since all moving objects with rest mass however it only has wavelike properties with an extremely small mass. The Rydberg equation is to calculate the amount of energy released when an electron drops to a lower energy level and works only f...
by cassidysong 1E
Sun Oct 13, 2019 1:33 pm
Forum: Properties of Light
Topic: Light intensity and Kinetic Energy
Replies: 7
Views: 43

Re: Light intensity and Kinetic Energy

When light intensity is increased, there are simply more photons and one photon interacts with a single electron. In order for each photon to have enough energy to eject one electron the wavelength needs to be shorter.
by cassidysong 1E
Sun Oct 13, 2019 1:28 pm
Forum: Properties of Light
Topic: Wave Properties of electrons
Replies: 7
Views: 43

Re: Wave Properties of electrons

Diffraction patterns are how light spreads out when it passes through a small passage. Based on the diffraction patterns there must be waves in phase (constructive) and waves out of phase (destructive interference) where the waves either line up with each other or they don't and they can cancel each...
by cassidysong 1E
Sun Oct 13, 2019 1:18 pm
Forum: Properties of Light
Topic: Rydberg constant
Replies: 7
Views: 46

Re: Rydberg constant

The Rydberg equation works only for the hydrogen spectrum because it was found based on the Hydrogen experiment. A more sophisticated model is needed for a multi-electron problem.
by cassidysong 1E
Thu Oct 03, 2019 1:00 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: States of Matter
Replies: 9
Views: 68

Re: States of Matter

No it doesn't matter.
by cassidysong 1E
Thu Oct 03, 2019 12:58 pm
Forum: Significant Figures
Topic: General sig figs question
Replies: 5
Views: 41

Re: General sig figs question

I'm pretty sure significant figures when adding or subtracting are dictated by the lowest amount of numbers after the decimal.
Ex. 12.5+5.35=17.9
by cassidysong 1E
Thu Oct 03, 2019 12:49 pm
Forum: SI Units, Unit Conversions
Topic: Dimensional Analysis Question
Replies: 6
Views: 37

Re: Dimensional Analysis Question

It's basically just a way to convert units from one to another. For example if you have distance given in yards (ex. 5 yards) you can use dimensional analysis to convert it into feet [i.e. (5 yards)x(3 feet/1 yard)= 15 feet; the yards cancel out and leave you with feet as the final unit].
by cassidysong 1E
Thu Oct 03, 2019 12:42 pm
Forum: Significant Figures
Topic: General Rules of Sig Figs with Example Questions
Replies: 4
Views: 47

Re: General Rules of Sig Figs with Example Questions

The general rule for the number of sig figs for an answer is exactly like what the previous reply said; they are based on the amount of numbers that aren't zero or any zeros that are in between other numbers. For example, 25.7 has three sig figs where as 25.07 has four sig figs. Another rule is that...
by cassidysong 1E
Wed Oct 02, 2019 12:10 am
Forum: Significant Figures
Topic: E21b. Sig Figs
Replies: 5
Views: 45

E21b. Sig Figs

If the given number is 25.92 mg of HF why is the amount of significant figures for the answer 3?

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