Search found 31 matches
- Sun Jun 10, 2018 11:33 pm
- Forum: Conjugate Acids & Bases
- Topic: basicity strength
- Replies: 3
- Views: 631
Re: basicity strength
A strong base also donates [OH-] to the solution and increases the value of the pH.
- Sun Jun 10, 2018 11:28 pm
- Forum: Conjugate Acids & Bases
- Topic: pKa [ENDORSED]
- Replies: 3
- Views: 621
Re: pKa [ENDORSED]
I thought pKa and Ka was not material covered in the 14A final? Will we be tested on this as well?
- Sun Jun 10, 2018 11:23 pm
- Forum: Lewis Acids & Bases
- Topic: Strong Acid
- Replies: 8
- Views: 1187
Re: Strong Acid
It completely dissociates in water and increases the [H3O^+] concentration thus decreasing pH.
- Sun Jun 03, 2018 8:36 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Tetrahedral and Square planar
- Replies: 8
- Views: 1481
Re: Tetrahedral and Square planar
Square planar and tetrahedral are both molecular geometries that are observed within the tetrahedral electron configuration subdivision. It is tetrahedral that has 109.5 degree bond angles and a molecular shape that is composed of multiple planes as well as hybridization of sp^3 while square planar ...
- Sun Jun 03, 2018 8:29 pm
- Forum: Biological Examples
- Topic: Biological Function
- Replies: 2
- Views: 482
Re: Biological Function
Will biological function of coordination compounds and relating specific biological functions to given compounds be a focus on the final?
- Sun Jun 03, 2018 8:27 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Final
- Replies: 5
- Views: 594
Re: Final
I assume that naming the coordination compounds is not necessary for this class
- Sun May 27, 2018 5:47 pm
- Forum: Dipole Moments
- Topic: Correct Dipole Depiction
- Replies: 4
- Views: 900
Re: Correct Dipole Depiction
I am interested in what changed between the original to the modern convention of dipole arrow drawings that causes such a discrepancy in arrow configuration?
- Sun May 27, 2018 5:44 pm
- Forum: Hybridization
- Topic: Hybrid Orbitals
- Replies: 4
- Views: 563
Re: Hybrid Orbitals
Hybridization of orbitals is usually greatly favored as this phenomena has lower energy compared to their separate counterparts. Since molecules and compounds form with the goal of attaining the lowest energy state of the interacting elements, it makes since that such an event occurs.
- Sun May 27, 2018 5:39 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 4
- Views: 897
Re: Bond Angles
I believe that this is not the central focus of bond angles that Dr. Lavelle wants us to get out. A huge part of bond angles is the number of bonding pairs compared to the lone pairs of the molecule as the lone pairs have greater repulsive forces than bonding pairs and thus cause one of the most sub...
- Sun May 20, 2018 11:15 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Strength
- Replies: 5
- Views: 868
Re: Bond Strength
I don't believe you mean that it has a stronger bond but rather that it has the greater chance of dipole interactions or Van Der Waals forces between the atoms due to the extra charge of the atom. This can make a stronger interaction between the atoms or molecules of the compound.
- Sun May 20, 2018 11:12 pm
- Forum: Electronegativity
- Topic: electronegativity chart
- Replies: 11
- Views: 1905
Re: electronegativity chart
Memorization of the electronegativity chart is not the most useful way to know the electronegativities. I would recommend remembering the basic trends and possible exception by knowing the number of valence electrons of each atom at ground state due to their electron configurations.
- Sun May 20, 2018 11:04 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: How to determine molecular shape
- Replies: 5
- Views: 688
Re: How to determine molecular shape
The 3-d molecular geometry of compounds has not been discussed in detail yet. I would just focus on the linearity of the compound at this point when observing interactions or Van Der Waals forces between compounds.
- Sun May 13, 2018 11:21 pm
- Forum: Electronegativity
- Topic: Trends? [ENDORSED]
- Replies: 10
- Views: 1671
Re: Trends? [ENDORSED]
you should remember the trends but also keep in mind how not every element follows these trends perfectly as the organization of the periodic table does not perfectly account for all of the features of these elements.
- Sun May 13, 2018 11:19 pm
- Forum: Lewis Structures
- Topic: Order of Dots
- Replies: 11
- Views: 1278
Re: Order of Dots
there is no specific order needed when filling in the dots representing the outer unshared valence electrons of an element within a molecule or compound. the number of electrons per element is much more important that the order in which they are drawn in so just remember the octet rule and Hund's ru...
- Sun May 13, 2018 11:15 pm
- Forum: Lewis Structures
- Topic: KCl Lewis formula
- Replies: 6
- Views: 1972
Re: KCl Lewis formula
You can also observe the electronegativity trends of the periodic table with those elements that have the highest attraction for electrons being in the top right corner of the table and those elements that are the most likely to lose electrons within a bond being in the bottom left corner.
- Sun May 06, 2018 10:49 pm
- Forum: Trends in The Periodic Table
- Topic: Stability of Cl vs Cl-
- Replies: 6
- Views: 2338
Re: Stability of Cl vs Cl-
noble gases and other elements as ions like Cl- with full octets are more stable and less likely to react with other elements
- Sun May 06, 2018 10:46 pm
- Forum: Ionic & Covalent Bonds
- Topic: Memorization of Electronegativity
- Replies: 6
- Views: 997
Re: Memorization of Electronegativity
knowing the basic trends of the periodic table is definitely helpful while memorization of such values would not help with a deeper understanding of the reasons why these trends exist. understanding the basic properties of the elements due to their electron configurations will be much more helpful f...
- Sun May 06, 2018 10:42 pm
- Forum: Limiting Reactant Calculations
- Topic: Test 1
- Replies: 4
- Views: 668
Re: Test 1
I agree that attending the office hours of your TA is very helpful. also, many questions or similar questions from the tests are found in the book or posted on Chemistry Community.
- Sun Apr 29, 2018 9:47 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: How to properly format your answers
- Replies: 6
- Views: 664
Re: How to properly format your answers
Does using a full arrow or half arrow indicate different properties of the electron configuration or is it just a matter of preference?
- Sun Apr 29, 2018 9:43 pm
- Forum: Photoelectric Effect
- Topic: Test 2 final question [ENDORSED]
- Replies: 15
- Views: 1914
Re: Test 2 final question [ENDORSED]
So for this question are we just supposed to assume that the photons of UV light contain enough energy to overcome the threshold energy of the electrons?
- Sun Apr 29, 2018 9:39 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Unpaired Electrons [ENDORSED]
- Replies: 7
- Views: 1107
Re: Unpaired Electrons [ENDORSED]
Electrons fill the orbital sub-shells singly first and then become paired after a single electron is present in each sub-shell of the orbital
- Sun Apr 29, 2018 9:38 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Unpaired Electrons [ENDORSED]
- Replies: 7
- Views: 1107
Re: Unpaired Electrons [ENDORSED]
Electrons fill the orbital sub-shells singly first and then become paired after a single electron is present in each sub-shell of the orbital
- Sun Apr 22, 2018 10:22 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Effect
- Replies: 12
- Views: 1146
Re: Photoelectric Effect
the energy has to be greater than or equal to the threshold energy or an electron will not be emitted. by having the energy of the photon be greater or equal to the energy of the electron this excess or equivalency of energy is converted to kinetic energy that is exhibited in the emitting of the ele...
- Sun Apr 22, 2018 10:17 pm
- Forum: DeBroglie Equation
- Topic: DeBrogile Module
- Replies: 6
- Views: 562
Re: DeBrogile Module
you definitely needed to convert the value as it cannot be used in equations unless it is written in the standard SI units of meters for distance or length measurements and seconds for time measurements
- Sun Apr 22, 2018 10:12 pm
- Forum: Properties of Light
- Topic: test 2
- Replies: 18
- Views: 1657
Re: test 2
the test is gonna cover concepts from Chapter 1 problems: 3,5,9,11,13,15,21,23,25,27,33,37,39,41 as stated in the recent email from Lavelle
- Sun Apr 15, 2018 9:17 pm
- Forum: Empirical & Molecular Formulas
- Topic: Compound Order
- Replies: 5
- Views: 1568
Re: Compound Order
I believe that at this point in the course, the order of the elements in the compound is not as important as having the correct relative quantities to each other and knowing the general chemical properties of the compound
- Sun Apr 15, 2018 9:13 pm
- Forum: General Science Questions
- Topic: Rusty on High School Chem [ENDORSED]
- Replies: 347
- Views: 463778
Re: Rusty on High School Chem [ENDORSED]
I took AP Chemistry in high school my sophomore year. I also am having trouble refreshing all of the information. fortunately, I shaved all of my notes that we had to compile into a project for review for the AP test at the end of the year. looking back at those and reading all the recommended sessi...
- Sun Apr 15, 2018 9:05 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Which mass of oxygen should be used? [ENDORSED]
- Replies: 23
- Views: 3388
Re: Which mass of oxygen should be used? [ENDORSED]
within the text book periodic table and on our first in-discussion test I believe that 16.00 was used so I would stay safe and utilize this number
- Sun Apr 15, 2018 8:56 pm
- Forum: Limiting Reactant Calculations
- Topic: Knowing if it's Limiting Reactions
- Replies: 6
- Views: 745
Re: Knowing if it's Limiting Reactions
keep in mind the purpose or the key concept that the question is asking you to utilize. if it is a simple determination of the mass of the products produced by the reaction, stoichiometry can be utilized and the limiting reactant has to be determine. however, if the question is not focusing on that ...
- Sun Apr 15, 2018 8:38 pm
- Forum: SI Units, Unit Conversions
- Topic: Length Units
- Replies: 15
- Views: 1535
Re: Length Units
I agree, usually the question will specify the units to convert to or start your conversions with.
- Sun Apr 15, 2018 8:25 pm
- Forum: Significant Figures
- Topic: Rounding: when and where?
- Replies: 10
- Views: 896
Re: Rounding: when and where?
during AP Chem in high school, we were recommended to round to the smallest number of sigfigs presented in the question