Search found 34 matches

by Amir Akhavan 1E
Sun Jun 03, 2018 11:06 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Significance of Coordination Number?
Replies: 7
Views: 217

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.
by Amir Akhavan 1E
Sun Jun 03, 2018 11:05 pm
Forum: Naming
Topic: Naming on Final
Replies: 8
Views: 318

Re: Naming on Final

I am pretty sure he said there is no naming on the final exam.
by Amir Akhavan 1E
Sun Jun 03, 2018 10:54 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands
Replies: 8
Views: 245

Re: Ligands

Ligands need to have at least one lone pair in order to bind to the metal and form a molecule.
by Amir Akhavan 1E
Sun May 27, 2018 3:00 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR
Replies: 3
Views: 127

Re: VSEPR

Molecules can have the same VSEPR formula. This formula is very helpful in determine the shape and bond angles of the molecule.
by Amir Akhavan 1E
Sun May 27, 2018 2:59 pm
Forum: Resonance Structures
Topic: Resonance Structures
Replies: 9
Views: 383

Re: Resonance Structures

The formal charges do not have to be the same for the different resonance structures.
by Amir Akhavan 1E
Sun May 27, 2018 2:56 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angle
Replies: 10
Views: 233

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.
by Amir Akhavan 1E
Sun May 20, 2018 10:34 pm
Forum: Resonance Structures
Topic: Bonds or Lone Pairs more important?
Replies: 7
Views: 413

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.
by Amir Akhavan 1E
Sun May 20, 2018 10:28 pm
Forum: Dipole Moments
Topic: London Dispersion, Induced dipole- Induced dipole, Van Der Waals
Replies: 5
Views: 174

Re: London Dispersion, Induced dipole- Induced dipole, Van Der Waals

Yes, all four terms relate to the same forces for our class.
by Amir Akhavan 1E
Sun May 20, 2018 10:24 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge purpose
Replies: 33
Views: 1182

Re: Formal charge purpose

The formal charge allows you to find the most stable form of the structure possible.
by Amir Akhavan 1E
Sun May 13, 2018 2:04 pm
Forum: Trends in The Periodic Table
Topic: electron affinity [ENDORSED]
Replies: 15
Views: 455

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.
by Amir Akhavan 1E
Sun May 13, 2018 2:00 pm
Forum: Formal Charge and Oxidation Numbers
Topic: formal charge vs. octet
Replies: 3
Views: 272

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.
by Amir Akhavan 1E
Sun May 13, 2018 1:45 pm
Forum: Ionic & Covalent Bonds
Topic: Lewis Structure vs Resonance Structure
Replies: 6
Views: 147

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.
by Amir Akhavan 1E
Sun May 13, 2018 1:37 pm
Forum: Lewis Structures
Topic: octect rule
Replies: 4
Views: 128

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.
by Amir Akhavan 1E
Sun May 13, 2018 1:29 pm
Forum: Resonance Structures
Topic: Resonance Structures
Replies: 5
Views: 187

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.
by Amir Akhavan 1E
Sun May 06, 2018 9:18 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Shapes of orbitals
Replies: 6
Views: 249

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.
by Amir Akhavan 1E
Sun May 06, 2018 9:14 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: f block elements
Replies: 2
Views: 88

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.
by Amir Akhavan 1E
Sun May 06, 2018 9:10 pm
Forum: Trends in The Periodic Table
Topic: Stability of Cl vs Cl-
Replies: 6
Views: 208

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.
by Amir Akhavan 1E
Wed May 02, 2018 10:47 am
Forum: Trends in The Periodic Table
Topic: atomic radius
Replies: 4
Views: 123

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.
by Amir Akhavan 1E
Sun Apr 29, 2018 9:05 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: HW 2.31 [ENDORSED]
Replies: 5
Views: 190

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.
by Amir Akhavan 1E
Sun Apr 29, 2018 9:02 pm
Forum: DeBroglie Equation
Topic: Calculating velocity
Replies: 5
Views: 219

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.
by Amir Akhavan 1E
Sun Apr 29, 2018 8:57 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty equation [ENDORSED]
Replies: 3
Views: 131

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.
by Amir Akhavan 1E
Sun Apr 29, 2018 8:54 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Unpaired Electrons [ENDORSED]
Replies: 7
Views: 330

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.
by Amir Akhavan 1E
Sun Apr 29, 2018 8:45 pm
Forum: Quantum Numbers and The H-Atom
Topic: Valence electrons [ENDORSED]
Replies: 7
Views: 394

Re: Valence electrons [ENDORSED]

Yes those are considered to be the valance electrons.
by Amir Akhavan 1E
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: 310

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.
by Amir Akhavan 1E
Sun Apr 22, 2018 8:17 pm
Forum: Properties of Light
Topic: Wavelengths
Replies: 8
Views: 225

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.
by Amir Akhavan 1E
Sun Apr 22, 2018 4:47 pm
Forum: Photoelectric Effect
Topic: Plastic vs Metal [ENDORSED]
Replies: 3
Views: 141

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.
by Amir Akhavan 1E
Sun Apr 22, 2018 4:43 pm
Forum: Einstein Equation
Topic: Planck's Constant Value [ENDORSED]
Replies: 7
Views: 2755

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.
by Amir Akhavan 1E
Sun Apr 22, 2018 4:40 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 81
Views: 45403

Re: Reading the textbook [ENDORSED]

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.
by Amir Akhavan 1E
Sun Apr 15, 2018 12:42 pm
Forum: Properties of Electrons
Topic: Electromagnetic Field [ENDORSED]
Replies: 7
Views: 236

Re: Electromagnetic Field [ENDORSED]

The direction does not matter as long as the two are perpendicular to one another.
by Amir Akhavan 1E
Sun Apr 15, 2018 12:39 pm
Forum: Properties of Light
Topic: wavelength description [ENDORSED]
Replies: 11
Views: 320

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.
by Amir Akhavan 1E
Sun Apr 15, 2018 12:33 pm
Forum: Photoelectric Effect
Topic: Post module quiz #25
Replies: 6
Views: 144

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.
by Amir Akhavan 1E
Sun Apr 08, 2018 3:41 pm
Forum: Significant Figures
Topic: Questions F11
Replies: 4
Views: 198

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.
by Amir Akhavan 1E
Sun Apr 08, 2018 3:33 pm
Forum: Balancing Chemical Reactions
Topic: Balancing equations with fractions [ENDORSED]
Replies: 13
Views: 461

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.
by Amir Akhavan 1E
Sun Apr 08, 2018 3:27 pm
Forum: Empirical & Molecular Formulas
Topic: Periodic Table Memorization [ENDORSED]
Replies: 8
Views: 375

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.

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