Search found 30 matches

by AnthonyDis1A
Sun Jun 10, 2018 4:46 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: coordination number=polydentate number?
Replies: 5
Views: 150

Re: coordination number=polydentate number?

I think double bonds are considered as one total ligand attachment.
by AnthonyDis1A
Sun Jun 10, 2018 4:44 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: 17.29
Replies: 2
Views: 107

Re: 17.29

When determining the charge of the central atom, I think you have to consider the ligands as separate molecules. For the CN ligand, you would have to draw its Lewis structure under the assumption that it was not bonded with Fe, and that it had a full octet. So you would get CN-.
by AnthonyDis1A
Sun Jun 10, 2018 4:39 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Charge of ligands
Replies: 5
Views: 219

Re: Charge of ligands

There are some ligands that are common polyatomic ions, like oxalate (C2O4)2-. Some of the textbook problems use these repeatedly, so memorizing some ions could save time.
by AnthonyDis1A
Sun Jun 03, 2018 1:06 am
Forum: Hybridization
Topic: Amplitude and Hybridization
Replies: 2
Views: 99

Re: Amplitude and Hybridization

What part of the chapter was this topic in?
by AnthonyDis1A
Sun Jun 03, 2018 1:03 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pair Placement [ENDORSED]
Replies: 2
Views: 92

Re: Lone Pair Placement [ENDORSED]

As mentioned in the previous post, some molecules like the trigonal bipyramidal shape have multiple intersecting planes of bonded atoms. In the horizontal plane of the trigonal bipyramidal shape, the bond angles are larger, and so I think the lone pair would probably cause less repulsion if placed b...
by AnthonyDis1A
Sun Jun 03, 2018 12:54 am
Forum: Hybridization
Topic: Hybridization Notation
Replies: 3
Views: 118

Re: Hybridization Notation

For atoms, I know we can just say sp hybridized, sp2 hybridized, etc. I guess for molecules the textbook notation should be followed, but I don't remember that in the lecture (not that it might not have been covered in lecture).
by AnthonyDis1A
Sun May 27, 2018 8:24 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Types of Bonds
Replies: 6
Views: 184

Re: Types of Bonds

Sigma bonds allow more flexibility for molecules to change shape. Pi bonds make molecules more rigid.
by AnthonyDis1A
Sun May 27, 2018 8:22 am
Forum: Determining Molecular Shape (VSEPR)
Topic: AXE Notation and Shape
Replies: 4
Views: 222

Re: AXE Notation and Shape

For me, it also helped to know the amount of lone pairs/bonding atoms that each shape had. For example, the seesaw shape has 4 bonded atoms and 1 lone pair on the central atom, for a total of 5 atoms total in the molecule.
by AnthonyDis1A
Sun May 27, 2018 8:19 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR
Replies: 3
Views: 140

Re: VSEPR

Molecules can be in the same VSEPR category. That would mean that their bonding domains/lone pairs would shape the angles between bonds the same way. For example, CH4 and and SO4 (2-) both have tetrahedral molecular geometry.
by AnthonyDis1A
Sun May 20, 2018 9:13 am
Forum: Dipole Moments
Topic: Polarization
Replies: 2
Views: 146

Re: Polarization

Polar molecules can be covalent as well. All that is needed to get polarity is/are more electronegative atom(s) pulling electrons to one region of a molecule. This is also shown by the dipole arrows on a diagram pointing in the same direction.
by AnthonyDis1A
Sun May 20, 2018 9:10 am
Forum: Bond Lengths & Energies
Topic: Pentane vs. 2,2 Dimethylpropane
Replies: 3
Views: 302

Re: Pentane vs. 2,2 Dimethylpropane

Molecular structures with greater surface area tend to have higher melting points.
by AnthonyDis1A
Sun May 20, 2018 9:07 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Bonds
Replies: 4
Views: 305

Re: Bonds

I don't think electron shielding and bond length are closely related.
by AnthonyDis1A
Sun May 13, 2018 9:30 pm
Forum: Ionic & Covalent Bonds
Topic: 3.25 part c
Replies: 3
Views: 123

Re: 3.25 part c

I think most, if not all the time, aluminum ions have a 3+ charge.
by AnthonyDis1A
Sun May 13, 2018 8:19 am
Forum: Resonance Structures
Topic: Resonance Structures and Formal charges
Replies: 7
Views: 291

Re: Resonance Structures and Formal charges

I thought this site explains the relationship between resonance structures and formal charges well. It also goes really in-depth with well-explained examples.

https://chem.libretexts.org/Core/Physic ... /Resonance
by AnthonyDis1A
Sun May 13, 2018 8:14 am
Forum: Formal Charge and Oxidation Numbers
Topic: Oxidation Number & Bonds
Replies: 6
Views: 222

Re: Oxidation Number & Bonds

Also, I think that the group where an element is located plays a role in its bonding. So to reinforce the previous post, Cl usually tries to gain one more electron to get a full octet because it is a halogen (Group 7).
by AnthonyDis1A
Sun May 06, 2018 10:48 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.37
Replies: 3
Views: 181

Re: 2.37

I think it just means that the s-orbitals are closer to the nucleus. There is a greater density of s-orbital electrons near the nucleus than that of other subshells.
by AnthonyDis1A
Sat May 05, 2018 10:28 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Everyday Objects and heisenberg's equation [ENDORSED]
Replies: 2
Views: 140

Re: Everyday Objects and heisenberg's equation [ENDORSED]

The uncertainty of larger objects is harder to determine because they are easier to observe. Knowing how fast a car is going doesn't affect our knowledge of where it is located, because cars are much bigger than atoms, and are therefore easier to observe.
by AnthonyDis1A
Sat May 05, 2018 10:18 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Homework 2.55
Replies: 2
Views: 106

Re: Homework 2.55

For atoms with an atomic number greater than 20, the 4s state is higher in energy than that of 3d, which is why the d subshells are written before the s subshells for those e- configurations. Just looking at the configurations, the 4s and 4p subshells are the two "written last" of the Grou...
by AnthonyDis1A
Sun Apr 29, 2018 5:28 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: understanding orbitals [ENDORSED]
Replies: 8
Views: 233

Re: understanding orbitals [ENDORSED]

I think that each plane shows the path with the highest probability of (specifically) the two electrons in that particular orbital.
by AnthonyDis1A
Sun Apr 29, 2018 5:22 pm
Forum: Quantum Numbers and The H-Atom
Topic: HW Problem 2.2 [ENDORSED]
Replies: 3
Views: 123

HW Problem 2.2 [ENDORSED]

Does an electron's energy increase when it moves from subshell to subshell?
by AnthonyDis1A
Sun Apr 29, 2018 5:17 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Change in momentum
Replies: 3
Views: 102

Re: Change in momentum

What does "minimum uncertainty" mean conceptually? Mathematically it's the minimum product of a particle's position and momentum, but what's the point in knowing an electron's minimum uncertainty?
by AnthonyDis1A
Sun Apr 22, 2018 8:36 pm
Forum: DeBroglie Equation
Topic: HW 1.37 [ENDORSED]
Replies: 6
Views: 300

Re: HW 1.37 [ENDORSED]

Being more precise and using more decimal places got me a percent difference closer to 0, but it's probably negligible since proton and neutron masses are already pretty close in value.
by AnthonyDis1A
Sun Apr 22, 2018 8:30 am
Forum: Properties of Electrons
Topic: Diffraction meaning
Replies: 6
Views: 242

Re: Diffraction meaning

"Constructive" and "destructive" describe wave properties in the context of wave interference. They are used in a specific instance.
by AnthonyDis1A
Sun Apr 22, 2018 8:25 am
Forum: Einstein Equation
Topic: einstein equation and other equations [ENDORSED]
Replies: 3
Views: 172

Re: einstein equation and other equations [ENDORSED]

The equation can also be used to find E(photon) in the photoelectric effect equation.
by AnthonyDis1A
Sun Apr 15, 2018 6:25 pm
Forum: Properties of Light
Topic: Light is a wave and a particle?
Replies: 5
Views: 179

Re: Light is a wave and a particle?

Light can be both a wave and a stream of particles (photons). It travels as a wave, but when participating in chemical reactions (i.e. being absorbed or emitted by elements), transfer energy in distinct quantities/particles. The photoelectric effect is one of those example chemical reactions.
by AnthonyDis1A
Fri Apr 13, 2018 11:01 am
Forum: Properties of Light
Topic: HW 1.5 [ENDORSED]
Replies: 7
Views: 295

Re: HW 1.5 [ENDORSED]

The textbook table is technically correct since the energy potential of both waves have a lot of overlap. However, one can differentiate the two conceptually: gamma rays are nuclear in origin, whereas X-rays have an electronic source. I guess the solution ranked gamma radiation as higher in energy t...
by AnthonyDis1A
Fri Apr 13, 2018 10:46 am
Forum: Properties of Light
Topic: key concept 4/11/18
Replies: 1
Views: 79

Re: key concept 4/11/18

The variables of the light equations represent the aspects of light that contribute to its energy, which is emitted or absorbed in discrete units. In other words, this energy can be quantified. Branching off this fact, it is also true that the intensity of light is proportional to its number of phot...
by AnthonyDis1A
Sun Apr 08, 2018 7:36 pm
Forum: Empirical & Molecular Formulas
Topic: Rounding molar ratios
Replies: 3
Views: 1167

Re: Rounding molar ratios

I think that if you get a weird decimal by the time you start dividing by the smallest mole amount, it's likely that the calculations before that are incorrect. There were a few problems where I tried rounding up .7 and .8, and got really strange numbers for my answers. My work before that point was...
by AnthonyDis1A
Sun Apr 08, 2018 10:58 am
Forum: Molarity, Solutions, Dilutions
Topic: G.16 Part C
Replies: 2
Views: 111

Re: G.16 Part C

I think CuSO4 * 5H2O means that for every CuSO4 molecule, there are 5 H2O molecules attached. The 5 H2O molecules are seen as already in the solution, and all the * 5H2O represents is that the CuSO4 is hydrated. Therefore, the * 5H2O only affects the molar mass of the hydrated CuSO4 molecule, and no...
by AnthonyDis1A
Sat Apr 07, 2018 9:23 am
Forum: Molarity, Solutions, Dilutions
Topic: HW G.7
Replies: 2
Views: 117

HW G.7

In a solution, does the solute need to be completely dissolved in the water for the solution to be considered aqueous?

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