Search found 30 matches
- Fri Dec 07, 2018 2:18 pm
- Forum: Bond Lengths & Energies
- Topic: intermolecular forces
- Replies: 1
- Views: 604
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.
- Fri Dec 07, 2018 11:54 am
- Forum: Naming
- Topic: Naming Coordination Compounds
- Replies: 3
- Views: 390
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...
- Fri Dec 07, 2018 11:33 am
- Forum: Amphoteric Compounds
- Topic: 7th edition 6A.17
- Replies: 3
- Views: 368
7th edition 6A.17
Can someone please explain on this homework problem how they can tell that the oxides As203 and Bi2O3 are amphoteric?
- Fri Nov 30, 2018 9:17 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Oxidation numbers
- Replies: 1
- Views: 246
Oxidation numbers
How do you find the oxidation number when you just have the molecular formula?
- Fri Nov 30, 2018 9:14 am
- Forum: Lewis Structures
- Topic: Octet Rule
- Replies: 5
- Views: 527
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.
- Fri Nov 30, 2018 9:07 am
- Forum: Hybridization
- Topic: Hybridization
- Replies: 2
- Views: 351
Hybridization
Is there a difference between the hybridization and atomic orbitals?
- Fri Nov 30, 2018 9:06 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone Pairs
- Replies: 11
- Views: 968
Lone Pairs
Can someone explain why the lone pairs affect the structure of the VSEPR models?
- Thu Nov 29, 2018 4:38 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizing power and polarizability
- Replies: 4
- Views: 545
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.
- Thu Nov 29, 2018 4:24 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Bond Strength
- Replies: 2
- Views: 309
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.
- Fri Nov 16, 2018 9:37 am
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizability
- Replies: 3
- Views: 464
Polarizability
What is polarizability? Also, I am confused on the different parts of the equation and how they relate.
- Fri Nov 16, 2018 9:31 am
- Forum: Dipole Moments
- Topic: Dipoles
- Replies: 3
- Views: 520
Dipoles
Can someone explain the dipole moments, induced dipole moments, and how they relate?
- Fri Nov 16, 2018 9:17 am
- Forum: Lewis Structures
- Topic: Electron configuration
- Replies: 3
- Views: 336
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...
- Fri Nov 09, 2018 10:57 am
- Forum: Lewis Structures
- Topic: Electrons on Least EN Atom
- Replies: 3
- Views: 547
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?
- Fri Nov 09, 2018 10:52 am
- Forum: Octet Exceptions
- Topic: octet exceptions
- Replies: 4
- Views: 506
octet exceptions
What are elements with octet exceptions and why do these occur?
- Fri Nov 09, 2018 10:44 am
- Forum: SI Units, Unit Conversions
- Topic: Angstrom
- Replies: 5
- Views: 970
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.
- Fri Nov 02, 2018 10:41 am
- Forum: Lewis Structures
- Topic: Lewis Acid and Bases
- Replies: 2
- Views: 331
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.
- Fri Nov 02, 2018 10:33 am
- Forum: Electronegativity
- Topic: Units for EN
- Replies: 3
- Views: 525
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.
- Fri Nov 02, 2018 10:18 am
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge of Ions
- Replies: 9
- Views: 1004
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...
- Fri Oct 26, 2018 12:16 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Conceptual question
- Replies: 3
- Views: 433
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...
- Fri Oct 26, 2018 12:07 am
- Forum: Properties of Light
- Topic: Test 2
- Replies: 7
- Views: 723
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.
- Fri Oct 26, 2018 12:03 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: atomic spectra Rydberg
- Replies: 3
- Views: 415
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) ??
- Fri Oct 19, 2018 10:46 am
- Forum: Significant Figures
- Topic: knowing how many sig figs to use
- Replies: 17
- Views: 2246
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.
- Fri Oct 19, 2018 10:42 am
- Forum: DeBroglie Equation
- Topic: De Broglie equation
- Replies: 3
- Views: 693
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...
- Fri Oct 19, 2018 10:24 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Problem 1D.9
- Replies: 3
- Views: 405
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.
- Fri Oct 12, 2018 10:22 am
- Forum: Einstein Equation
- Topic: Symbol for frequency
- Replies: 12
- Views: 2301
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).
- Fri Oct 12, 2018 10:18 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Balmer and Lyman series
- Replies: 4
- Views: 332
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...
- Fri Oct 12, 2018 10:10 am
- Forum: Properties of Light
- Topic: Threshold Energy
- Replies: 11
- Views: 830
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.
- Thu Oct 04, 2018 7:33 pm
- Forum: Significant Figures
- Topic: Homework Regarding Avogadros Number
- Replies: 4
- Views: 331
Re: Homework Regarding Avogadros Number
I believe you need to do it with the 6.022 because it is more accurate.
- Thu Oct 04, 2018 7:27 pm
- Forum: Limiting Reactant Calculations
- Topic: Limiting reactants [ENDORSED]
- Replies: 3
- Views: 371
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...
- Thu Oct 04, 2018 7:04 pm
- Forum: SI Units, Unit Conversions
- Topic: HW E9 in textbook
- Replies: 3
- Views: 365
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.