Search found 34 matches
- Sun Jun 03, 2018 11:06 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Significance of Coordination Number?
- Replies: 7
- Views: 2519
Re: Significance of Coordination Number?
I think it is important in naming the molecule and knowing its geometric shape. It could also be a question he may ask on the exam.
- Sun Jun 03, 2018 11:05 pm
- Forum: Naming
- Topic: Naming on Final
- Replies: 8
- Views: 1093
Re: Naming on Final
I am pretty sure he said there is no naming on the final exam.
- Sun Jun 03, 2018 10:54 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligands
- Replies: 8
- Views: 1274
Re: Ligands
Ligands need to have at least one lone pair in order to bind to the metal and form a molecule.
- Sun May 27, 2018 3:00 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR
- Replies: 3
- Views: 435
Re: VSEPR
Molecules can have the same VSEPR formula. This formula is very helpful in determine the shape and bond angles of the molecule.
- Sun May 27, 2018 2:59 pm
- Forum: Resonance Structures
- Topic: Resonance Structures
- Replies: 9
- Views: 1111
Re: Resonance Structures
The formal charges do not have to be the same for the different resonance structures.
- Sun May 27, 2018 2:56 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angle
- Replies: 10
- Views: 1105
Re: Bond Angle
The bond angle is determined by the molecular shape of the molecule and the amount of lone pairs the molecule has. It is helpful to draw the shapes to visualize the angles better.
- Sun May 20, 2018 10:34 pm
- Forum: Resonance Structures
- Topic: Bonds or Lone Pairs more important?
- Replies: 7
- Views: 1076
Re: Bonds or Lone Pairs more important?
There is no general rule to follow when it comes to this. Every situation should be assessed differently.
- Sun May 20, 2018 10:28 pm
- Forum: Dipole Moments
- Topic: London Dispersion, Induced dipole- Induced dipole, Van Der Waals
- Replies: 5
- Views: 594
Re: London Dispersion, Induced dipole- Induced dipole, Van Der Waals
Yes, all four terms relate to the same forces for our class.
- Sun May 20, 2018 10:24 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal charge purpose
- Replies: 40
- Views: 6987
Re: Formal charge purpose
The formal charge allows you to find the most stable form of the structure possible.
- Sun May 13, 2018 2:04 pm
- Forum: Trends in The Periodic Table
- Topic: electron affinity [ENDORSED]
- Replies: 15
- Views: 1927
Re: electron affinity [ENDORSED]
Electron affinity is the amount of energy released when an electron is gained. Another way of saying this would be how bad the element wants to gain an electron.
- Sun May 13, 2018 2:00 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: formal charge vs. octet
- Replies: 3
- Views: 662
Re: formal charge vs. octet
The octet rule must always be obeyed unless the atom has extra electrons which can be used from the d and f subshells. However you use the formal charge to help determine the correct lewis structure because the lower the formal charge the more stable it is.
- Sun May 13, 2018 1:45 pm
- Forum: Ionic & Covalent Bonds
- Topic: Lewis Structure vs Resonance Structure
- Replies: 6
- Views: 674
Re: Lewis Structure vs Resonance Structure
Resonance structures are lewis structures which can have more than one possibility of forming the structure. An example of this would be by using different locations for double bonds for a structure.
- Sun May 13, 2018 1:37 pm
- Forum: Lewis Structures
- Topic: octect rule
- Replies: 4
- Views: 644
Re: octect rule
You can only break the octet rule if the atom has extra electrons available from the d or f subshells. If not the rule cannot be broken and a maximum of 8 electrons must be used for that element. Only break the rule when it allows for a proper lewis structure to be formed.
- Sun May 13, 2018 1:29 pm
- Forum: Resonance Structures
- Topic: Resonance Structures
- Replies: 5
- Views: 2707
Re: Resonance Structures
Only draw all of them if the question asks you to draw all resonance structures. If the question does not ask you only need to draw one of them and it would be considered correct.
- Sun May 06, 2018 9:18 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Shapes of orbitals
- Replies: 6
- Views: 733
Re: Shapes of orbitals
I don't think we will need to draw them on the test, however, I would be familiar with them just in case and to help understand the concept.
- Sun May 06, 2018 9:14 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: f block elements
- Replies: 2
- Views: 421
Re: f block elements
Professor Lavelle said we will not have to deal with any electron configurations past Krypton. However, this is just a general rule I would be familiar with. Similar to how the d block is one behind, the f is two behind.
- Sun May 06, 2018 9:10 pm
- Forum: Trends in The Periodic Table
- Topic: Stability of Cl vs Cl-
- Replies: 6
- Views: 2246
Re: Stability of Cl vs Cl-
The more stable it is the less reactive it will be because it already has a more desirable amount of electrons. Once Cl gains an electron it has a full octet and does not have a desire to gain any more electrons. Its properties will become similar to that of Argon.
- Wed May 02, 2018 10:47 am
- Forum: Trends in The Periodic Table
- Topic: atomic radius
- Replies: 4
- Views: 503
Re: atomic radius
I do not think we will need to know how to exactly calculate atomic radii but instead just to be aware of the trends occurring on the periodic table in regard to it.
- Sun Apr 29, 2018 9:05 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: HW 2.31 [ENDORSED]
- Replies: 5
- Views: 694
Re: HW 2.31 [ENDORSED]
2d does not exist because the first subshell for d is 3d and there is no such thing as a g orbital.
- Sun Apr 29, 2018 9:02 pm
- Forum: DeBroglie Equation
- Topic: Calculating velocity
- Replies: 5
- Views: 578
Re: Calculating velocity
To find velocity you can just use the equation that wavelength equals planks constant over mass times velocity. You should know the mass of the object such as an electron which will be given.
- Sun Apr 29, 2018 8:57 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Uncertainty equation [ENDORSED]
- Replies: 3
- Views: 432
Re: Uncertainty equation [ENDORSED]
Pi is simply used as a constant and the professor did not explain why this is used in this equation or how it was derived.
- Sun Apr 29, 2018 8:54 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Unpaired Electrons [ENDORSED]
- Replies: 7
- Views: 1045
Re: Unpaired Electrons [ENDORSED]
Write down the electron configuration and then draw the orbitals to get a visual of the unpaired electrons. The orbitals with only one arrow are unpaired.
- Sun Apr 29, 2018 8:45 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Valence electrons [ENDORSED]
- Replies: 7
- Views: 2550
Re: Valence electrons [ENDORSED]
Yes those are considered to be the valance electrons.
- Sun Apr 29, 2018 8:28 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: What does electron spin actually mean? [ENDORSED]
- Replies: 9
- Views: 3343
Re: What does electron spin actually mean? [ENDORSED]
Electrons with parallel spin both spin in the same direction however the will occupy different orbitals because no two electrons in the same atom can have the same 4 quantum numbers.
- Sun Apr 22, 2018 8:17 pm
- Forum: Properties of Light
- Topic: Wavelengths
- Replies: 8
- Views: 653
Re: Wavelengths
My TA told us that we just need to have a general understanding of the order which helps know which waves have larger or smaller wavelengths and frequency.
- Sun Apr 22, 2018 4:47 pm
- Forum: Photoelectric Effect
- Topic: Plastic vs Metal [ENDORSED]
- Replies: 3
- Views: 479
Re: Plastic vs Metal [ENDORSED]
The Professor said that the material must be able to conduct electricity and if not and electron will not be emitted after shining photons onto the object. Plastics are unable to act as conductors and thus the experiment would be unable to work.
- Sun Apr 22, 2018 4:43 pm
- Forum: Einstein Equation
- Topic: Planck's Constant Value [ENDORSED]
- Replies: 7
- Views: 3331
Re: Planck's Constant Value [ENDORSED]
It is always safer to use whatever is given on the formula sheet. However, more decimals will give a more exact answer which may be preferred.
- Sun Apr 22, 2018 4:40 pm
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 146885
Re: Reading the textbook
I feel that reading the textbook is very helpful in getting a better understanding of the topics in much more detail. Although it seems intimidating at first, it is readable and highly recommended.
- Sun Apr 15, 2018 12:42 pm
- Forum: Properties of Electrons
- Topic: Electromagnetic Field [ENDORSED]
- Replies: 7
- Views: 810
Re: Electromagnetic Field [ENDORSED]
The direction does not matter as long as the two are perpendicular to one another.
- Sun Apr 15, 2018 12:39 pm
- Forum: Properties of Light
- Topic: wavelength description [ENDORSED]
- Replies: 11
- Views: 1180
Re: wavelength description [ENDORSED]
The amplitude of a wave is defined as its height from the center line. The amplitude is very important in determining the energy of the wave because the larger the amplitude the higher the levels of energy will be as a result.
- Sun Apr 15, 2018 12:33 pm
- Forum: Photoelectric Effect
- Topic: Post module quiz #25
- Replies: 6
- Views: 315
Re: Post module quiz #25
I think the answer would be choice D. The equation E= hv is the best answer because it creates a direct correlation between energy and the frequency.
- Sun Apr 08, 2018 3:41 pm
- Forum: Significant Figures
- Topic: Questions F11
- Replies: 4
- Views: 522
Re: Questions F11
I also think the answer should have only three significant figures instead of four. However, the professor said significant figures would not be counted on the first exam yet.
- Sun Apr 08, 2018 3:33 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing equations with fractions [ENDORSED]
- Replies: 13
- Views: 1564
Re: Balancing equations with fractions [ENDORSED]
Stoichiometric coefficients should be whole numbers so therefore you should multiply all coefficients by 2. This would make the equation easier to understand as there would be no messy fractions.
- Sun Apr 08, 2018 3:27 pm
- Forum: Empirical & Molecular Formulas
- Topic: Periodic Table Memorization [ENDORSED]
- Replies: 8
- Views: 817
Re: Periodic Table Memorization [ENDORSED]
No, it is not necessary to memorize any aspects of the periodic table. All needed information will be given for the first exam such as mass and atomic number.