Search found 30 matches

by Nicholas Kull_3L
Fri Dec 07, 2018 2:18 pm
Forum: Bond Lengths & Energies
Topic: intermolecular forces
Replies: 1
Views: 235

Re: intermolecular forces

Van Der Waals forces occur in nonpolar molecules and in all chemical bonds, hydrogen bonding occurs with H and either a O, N, or F by forming a polar covalent bond, and dipole dipoles occur when there is a significant electronegativity difference causing polarity.
by Nicholas Kull_3L
Fri Dec 07, 2018 11:54 am
Forum: Naming
Topic: Naming Coordination Compounds
Replies: 3
Views: 83

Re: Naming Coordination Compounds

In regards to naming coordination compounds and the charges of metals in the brackets, the charge of metal ion + charge of negative and neutral ligands = total charge of the compound. Also, don't forget to take into account any atoms with charges on the outside of the brackets when considering overa...
by Nicholas Kull_3L
Fri Dec 07, 2018 11:33 am
Forum: Amphoteric Compounds
Topic: 7th edition 6A.17
Replies: 3
Views: 104

7th edition 6A.17

Can someone please explain on this homework problem how they can tell that the oxides As203 and Bi2O3 are amphoteric?
by Nicholas Kull_3L
Fri Nov 30, 2018 9:17 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Oxidation numbers
Replies: 1
Views: 50

Oxidation numbers

How do you find the oxidation number when you just have the molecular formula?
by Nicholas Kull_3L
Fri Nov 30, 2018 9:14 am
Forum: Lewis Structures
Topic: Octet Rule
Replies: 5
Views: 118

Re: Octet Rule

Expanded octets, in period 3 or below, violate this rule because they can hold more electrons than 8 to have more stability and more neutral charges. These extra lone pair electrons can alter the shape too.
by Nicholas Kull_3L
Fri Nov 30, 2018 9:07 am
Forum: Hybridization
Topic: Hybridization
Replies: 2
Views: 89

Hybridization

Is there a difference between the hybridization and atomic orbitals?
by Nicholas Kull_3L
Fri Nov 30, 2018 9:06 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 11
Views: 208

Lone Pairs

Can someone explain why the lone pairs affect the structure of the VSEPR models?
by Nicholas Kull_3L
Thu Nov 29, 2018 4:38 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizing power and polarizability
Replies: 4
Views: 141

Re: Polarizing power and polarizability

Polarizing Power are when the cations pull electrons away from anions, and the smaller and more positive the cation the stronger their pull. Polarizability is how easily an electron cloud is distorted by an electronic field.
by Nicholas Kull_3L
Thu Nov 29, 2018 4:24 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Bond Strength
Replies: 2
Views: 67

Re: Bond Strength

The EN of oxygen is significantly larger, and the lone pair of electrons on the ammonia have much more affinity for a strong bond than the oxygen does.
by Nicholas Kull_3L
Fri Nov 16, 2018 9:37 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability
Replies: 3
Views: 134

Polarizability

What is polarizability? Also, I am confused on the different parts of the equation and how they relate.
by Nicholas Kull_3L
Fri Nov 16, 2018 9:31 am
Forum: Dipole Moments
Topic: Dipoles
Replies: 3
Views: 112

Dipoles

Can someone explain the dipole moments, induced dipole moments, and how they relate?
by Nicholas Kull_3L
Fri Nov 16, 2018 9:17 am
Forum: Lewis Structures
Topic: Electron configuration
Replies: 3
Views: 94

Re: Electron configuration

It is Selenium because the ion has a +1 charge with the given electron configuration. Starting in the 4th period, the s and d orbitals are full (4s^2 followed by 3d^10), so we can immediately focus on the p orbital. There are three electrons in the p orbital after the +1 charge is taken into account...
by Nicholas Kull_3L
Fri Nov 09, 2018 10:57 am
Forum: Lewis Structures
Topic: Electrons on Least EN Atom
Replies: 3
Views: 93

Electrons on Least EN Atom

When is it okay to put electrons on in the middle of your Lewis Structure on the least EN atom? Also, are there any recommended videos on how to draw Lewis Structures?
by Nicholas Kull_3L
Fri Nov 09, 2018 10:52 am
Forum: Octet Exceptions
Topic: octet exceptions
Replies: 4
Views: 122

octet exceptions

What are elements with octet exceptions and why do these occur?
by Nicholas Kull_3L
Fri Nov 09, 2018 10:44 am
Forum: SI Units, Unit Conversions
Topic: Angstrom
Replies: 5
Views: 394

Re: Angstrom

Representing length or distance, it is also commonly used for expressing the size of atoms and molecules which will be a reoccurring concept.
by Nicholas Kull_3L
Fri Nov 02, 2018 10:41 am
Forum: Lewis Structures
Topic: Lewis Acid and Bases
Replies: 2
Views: 55

Lewis Acid and Bases

Will we need to know Lewis Acid and Bases for the midterm? And if so can some please explain the concept to me, thank you.
by Nicholas Kull_3L
Fri Nov 02, 2018 10:33 am
Forum: Electronegativity
Topic: Units for EN
Replies: 3
Views: 86

Re: Units for EN

There are no units for EN because it is more a chemical property that describes the tendency to attract electrons. A scale is used with trends on the periodic table because this is the easiest way to describe EN relationships.
by Nicholas Kull_3L
Fri Nov 02, 2018 10:18 am
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge of Ions
Replies: 9
Views: 221

Re: Formal Charge of Ions

Unless the question states that it wants the resonance structure drawn, then technically you would not have to draw it to determine formal charge because you could just use the formula; however, is extremely helpful to draw it out to make sure you have the correct number of lone pair and shared elec...
by Nicholas Kull_3L
Fri Oct 26, 2018 12:16 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Conceptual question
Replies: 3
Views: 145

Re: Conceptual question

Heisenberg's Uncertainty Principle states that complementarity (the impossibility of knowing both the precise values of either momentum or position simultaneously), is the reason why, and that position and momentum are inversely related. Once a value of either is known we have to use the uncertainty...
by Nicholas Kull_3L
Fri Oct 26, 2018 12:07 am
Forum: Properties of Light
Topic: Test 2
Replies: 7
Views: 262

Re: Test 2

On Lavelle's website, under "Constants and Equations", you can see the sheet with all the formulas and values given. Anything not listed will most likely have to be known.
by Nicholas Kull_3L
Fri Oct 26, 2018 12:03 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: atomic spectra Rydberg
Replies: 3
Views: 137

atomic spectra Rydberg

Do you use the bigger or smaller n energy level value first in the equation v (frequency) = R (1/n^2 - 1/n^2) ??
by Nicholas Kull_3L
Fri Oct 19, 2018 10:46 am
Forum: Significant Figures
Topic: knowing how many sig figs to use
Replies: 17
Views: 681

Re: knowing how many sig figs to use

yes that is two sig figs and usually you base it off how many sig figs are in the question asked.
by Nicholas Kull_3L
Fri Oct 19, 2018 10:42 am
Forum: DeBroglie Equation
Topic: De Broglie equation
Replies: 3
Views: 97

Re: De Broglie equation

The equation for the speed of light is c= (lambda) x (v frequency). Momentum (p) = (mass, m) x (velocity, v), E = pc, and E = hv are the base equations needed to find De Broglie's equation. In the equation E = hv, v is the frequency and is equal to c/lambda after rearranging the speed of light equat...
by Nicholas Kull_3L
Fri Oct 19, 2018 10:24 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Problem 1D.9
Replies: 3
Views: 131

Re: Problem 1D.9

Understanding orbitals can be confusing, and if you don't have a solution manual getting to the correct answer is tough. I believe we will need to know these aspects orbitals, and a source that has helped me are orbital videos on Khan Academy because they show it visually which I find helpful.
by Nicholas Kull_3L
Fri Oct 12, 2018 10:22 am
Forum: Einstein Equation
Topic: Symbol for frequency
Replies: 12
Views: 246

Re: Symbol for frequency

Yes, that is the best way to avoid confusion because that is what the textbook has as the symbol for frequency (v Greek letter nu).
by Nicholas Kull_3L
Fri Oct 12, 2018 10:18 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Balmer and Lyman series
Replies: 4
Views: 86

Re: Balmer and Lyman series

The Balmer and Lyman series are very important because they are the names of spectral lines, and they show when electrons rest and at which levels. For the Balmer series, it handles visible light and electrons rest at n=1; on the other hand, the Lyman series handles UV light, and electrons rest at n...
by Nicholas Kull_3L
Fri Oct 12, 2018 10:10 am
Forum: Properties of Light
Topic: Threshold Energy
Replies: 11
Views: 120

Re: Threshold Energy

Threshold energy is the amount of energy that is required to remove an electron from a metallic surface. The two main forces that determine how electrons will react to the photons of light are intensity and frequency.
by Nicholas Kull_3L
Thu Oct 04, 2018 7:33 pm
Forum: Significant Figures
Topic: Homework Regarding Avogadros Number
Replies: 4
Views: 79

Re: Homework Regarding Avogadros Number

I believe you need to do it with the 6.022 because it is more accurate.
by Nicholas Kull_3L
Thu Oct 04, 2018 7:27 pm
Forum: Limiting Reactant Calculations
Topic: Limiting reactants [ENDORSED]
Replies: 3
Views: 89

Re: Limiting reactants [ENDORSED]

It is not safe to say because there is a possibility that it could be the other reactant. After identifying the reactants and balancing the chemical equation, you should calculate the molar mass of the reactants and products and convert it into moles. Then to compare the calculated moles to the requ...
by Nicholas Kull_3L
Thu Oct 04, 2018 7:04 pm
Forum: SI Units, Unit Conversions
Topic: HW E9 in textbook
Replies: 3
Views: 82

Re: HW E9 in textbook

Atoms make up molecules. For example, you could have one molecule of water which is made up of 3 atoms ( 2 hydrogen and 1 oxygen). To calculate the number of moles you would take the amount of grams of the element divided by the molar mass of the element.

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