Search found 34 matches
- Thu Dec 06, 2018 10:22 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizable
- Replies: 4
- Views: 651
Re: Polarizable
Greatest ionic character is between the species with the most polarizability/greatest polarizing power because the electron clouds are more distorted, creating dipole moments. Greatest covalent character is between species with the least polarizability/least polarizing power. In my notes, I wrote d...
- Thu Dec 06, 2018 10:07 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Overall Polarity of the Molecule/Net Dipole
- Replies: 1
- Views: 373
Overall Polarity of the Molecule/Net Dipole
How do lone pairs affect the net dipole of a molecule?
How can you determine if a molecule has a net dipole by looking at its VSEPR formula?
How can you determine the overall polarity of a molecule by looking at its lewis structure?
How can you determine if a molecule has a net dipole by looking at its VSEPR formula?
How can you determine the overall polarity of a molecule by looking at its lewis structure?
- Thu Dec 06, 2018 10:05 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizing Power: Size vs. Charge
- Replies: 4
- Views: 723
Polarizing Power: Size vs. Charge
When determining the polarizing power of a cation, which is more important: size of the cation or charge of the cation?
- Thu Dec 06, 2018 9:54 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Size and Polarizability
- Replies: 4
- Views: 686
Size and Polarizability
In class, we learned that the larger the anion, the more polarizable it is.
How is size of an anion measured in this case? Is size referring to ionic radii?
How is size of an anion measured in this case? Is size referring to ionic radii?
- Wed Dec 05, 2018 2:22 pm
- Forum: Administrative Questions and Class Announcements
- Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
- Replies: 118
- Views: 21568
Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
Thank you so much for all that you do!
- Tue Dec 04, 2018 6:45 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligand Binding Places
- Replies: 2
- Views: 372
Ligand Binding Places
Given just a ligand, how can you determine the maximum number of places on the ligand that can bind simultaneously to a single metal center?
Ex. For , how do you determine if it is monodentate, bidentate, or tridentate ligand?
Ex. For , how do you determine if it is monodentate, bidentate, or tridentate ligand?
- Tue Dec 04, 2018 5:28 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Identifying Ligands
- Replies: 2
- Views: 330
Identifying Ligands
How do we determine if a given molecule is a ligand?
- Tue Dec 04, 2018 5:26 pm
- Forum: Naming
- Topic: Ligand Charge
- Replies: 1
- Views: 197
Ligand Charge
How do we determine the charge of a ligand in a coordination compound (in order to find the oxidation number of the metal).
Ex. For , how would we know the charge of NH3?
Ex. For , how would we know the charge of NH3?
- Sun Dec 02, 2018 6:24 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic and Covalent Character
- Replies: 3
- Views: 466
Ionic and Covalent Character
How do you determine which (covalently-bonded) molecule will have more ionic character?
How do you determine which (ionic compound) will have more covalent character?
How do you determine which (ionic compound) will have more covalent character?
- Sun Dec 02, 2018 3:28 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization Energy and Electron Affinity Trend Exceptions
- Replies: 2
- Views: 708
Ionization Energy and Electron Affinity Trend Exceptions
What are the relative ionization energies and electron affinities of C, N, O, and F? Why?
Are there any other ionization energy or electron affinity trend exceptions?
Are there any other ionization energy or electron affinity trend exceptions?
- Mon Nov 26, 2018 3:46 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Size of Atom and Strength of Attractive/Intermolecular Forces
- Replies: 1
- Views: 1366
Size of Atom and Strength of Attractive/Intermolecular Forces
Why does a larger atom have stronger intermolecular forces?
Also, when we refer to the size of an atom, are we referring to its molecular mass, atomic number, or atomic radius?
Also, when we refer to the size of an atom, are we referring to its molecular mass, atomic number, or atomic radius?
- Mon Nov 26, 2018 3:44 pm
- Forum: Bond Lengths & Energies
- Topic: Atom Size and Bond Strength
- Replies: 2
- Views: 417
Atom Size and Bond Strength
Why does a larger atom result in a weaker bond?
Also, when we refer to the size of an atom, are we referring to its molecular mass, atomic number, or atomic radius?
Also, when we refer to the size of an atom, are we referring to its molecular mass, atomic number, or atomic radius?
- Sun Nov 18, 2018 10:57 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Position of Lone Pairs in H20
- Replies: 3
- Views: 897
Position of Lone Pairs in H20
If lone pair-lone pair repulsion is the strongest, and lone pairs want to maximize the distance between themselves, then why in H20 are the two lone pairs next to each other on the oxygen (resulting in a bent shape), as opposed to one pair being on top of the oxygen, and one pair being below the oxy...
- Tue Nov 13, 2018 7:32 pm
- Forum: Dipole Moments
- Topic: Determining Intermolecular Forces
- Replies: 5
- Views: 3382
Determining Intermolecular Forces
Is there a way to determine which intermolecular forces will occur between certain molecules solely by looking at the chemical equation (without drawing the lewis structure)? For example, would you be able to tell which intermolecular forces would occur between H2SeO4 molecules without drawing the l...
- Tue Nov 13, 2018 7:11 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lowest Energy Lewis Structures
- Replies: 3
- Views: 408
Lowest Energy Lewis Structures
When using the Lewis Structure of a molecule to determine the molecular shape, should we use the lowest energy Lewis Structure by checking formal charges, and using the octet exceptions (expanded octet, etc.) when necessary?
- Wed Nov 07, 2018 6:41 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Distortion, Polarizability
- Replies: 2
- Views: 713
Distortion, Polarizability
What is distortion? What is polarizability? How are they related?
- Wed Nov 07, 2018 5:20 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Effect of Size of Atom/Molecule on Distortion
- Replies: 2
- Views: 332
Effect of Size of Atom/Molecule on Distortion
What measurement are we using to compare the sizes of atoms/molecules? (ex. molar mass, atomic radius, atomic number, number of electrons)
How does size of an atom/molecule affect distortion?
How does size of an atom/molecule affect distortion?
- Fri Nov 02, 2018 3:54 pm
- Forum: Ionic & Covalent Bonds
- Topic: Non-polar and Polar Covalent Bonds
- Replies: 3
- Views: 476
Non-polar and Polar Covalent Bonds
In chemistry, how do we distinguish between non-polar and polar covalent bonds?
I remember learning that a C-H bond is non-polar, even though Carbon and Hydrogen don't have the same electronegativities.
I remember learning that a C-H bond is non-polar, even though Carbon and Hydrogen don't have the same electronegativities.
- Fri Nov 02, 2018 3:51 pm
- Forum: Trends in The Periodic Table
- Topic: Oxidation Number
- Replies: 1
- Views: 206
Oxidation Number
How do you find the maximum positive and negative oxidation number for an element?
- Thu Nov 01, 2018 10:21 pm
- Forum: Octet Exceptions
- Topic: H, He, Li, Be Rule
- Replies: 3
- Views: 848
Re: H, He, Li, Be Rule
As others have said, hydrogen, helium, lithium, and beryllium only have s subshells. Each s subshell can only hold 2 e-. These elements do not have the p subshells required to hold 8 valence e-.
- Tue Oct 30, 2018 2:29 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 3d and 4s: filling and energy
- Replies: 1
- Views: 1120
3d and 4s: filling and energy
Why is 4s filled with electrons before 3d?
Then, why does 4s have higher energy than 3d once it is filled?
Then, why does 4s have higher energy than 3d once it is filled?
- Tue Oct 30, 2018 1:47 pm
- Forum: Octet Exceptions
- Topic: Expanded Octet Circumstances
- Replies: 1
- Views: 258
Expanded Octet Circumstances
Which elements can form expanded octets? Why can these elements form expanded octets?
In what circumstances do the elements that are capable of having expanded octets form expanded octets? (Aren't elements most stable with 8 valence electrons?)
In what circumstances do the elements that are capable of having expanded octets form expanded octets? (Aren't elements most stable with 8 valence electrons?)
- Wed Oct 24, 2018 3:03 pm
- Forum: Trends in The Periodic Table
- Topic: Removing 2nd Electron
- Replies: 9
- Views: 789
Removing 2nd Electron
Why is it harder to remove a second electron from an atom (higher ionization energy)?
- Mon Oct 22, 2018 9:38 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Magnetic Quantum Number
- Replies: 3
- Views: 495
Magnetic Quantum Number
Given the magnetic quantum number, what information can we directly deduce about an orbital?
- Mon Oct 22, 2018 9:36 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Significance of XYZ to PDF orbitals
- Replies: 6
- Views: 563
Significance of XYZ to PDF orbitals
Why are P, D, F orbitals distinguished with X, Y, and Z (ex. Px, Py, Pz, Dxy, Dyz, etc.)? Is it just to show what axis the orbitals and lobes are located along?
- Mon Oct 22, 2018 9:31 pm
- Forum: Properties of Electrons
- Topic: Effective Nuclear Charge
- Replies: 1
- Views: 368
Effective Nuclear Charge
I know that effective nuclear charge relates to electron shielding, but what is it exactly? How does it relate to Coulomb's law?
- Mon Oct 22, 2018 9:26 pm
- Forum: Properties of Light
- Topic: SI Units
- Replies: 6
- Views: 618
Re: SI Units
I would also recommend knowing how to convert from g to kg, as kg is the SI unit for mass.
- Mon Oct 22, 2018 12:11 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Value of Delta X
- Replies: 9
- Views: 1099
Value of Delta X
For our purposes, will the value of delta X always be the diameter of the atom?
- Fri Oct 12, 2018 10:33 pm
- Forum: Properties of Electrons
- Topic: Free vs. Bound Electrons
- Replies: 6
- Views: 6004
Free vs. Bound Electrons
What is the difference between free and bound electrons?
- Fri Oct 12, 2018 10:28 pm
- Forum: Photoelectric Effect
- Topic: Properties of Light
- Replies: 5
- Views: 344
Properties of Light
How is the intensity of a wave/light source measured?
Also, for our purposes, how are we defining "energy"?
Also, for our purposes, how are we defining "energy"?
- Fri Oct 12, 2018 9:44 pm
- Forum: Significant Figures
- Topic: All students read this sig fig post [ENDORSED]
- Replies: 170
- Views: 35427
Re: All students read this sig fig post [ENDORSED]
When taking values from the periodic table (ex. for calculating molar mass), how many significant figures do you round to?
- Tue Oct 02, 2018 1:26 pm
- Forum: Empirical & Molecular Formulas
- Topic: Correct Answer for Audio-Visual Focus-Topics Empirical and Molecular Formulas Pre-Module Assessment
- Replies: 3
- Views: 308
Correct Answer for Audio-Visual Focus-Topics Empirical and Molecular Formulas Pre-Module Assessment
What is the correct answer for #14?
#14.
339.20 g of a cobalt metal is reacted with fluorine gas to produce 996.08 g of a compound. What is the empirical formula of the new compound?
How can we find the correct answers for the pre/post assessments?
#14.
339.20 g of a cobalt metal is reacted with fluorine gas to produce 996.08 g of a compound. What is the empirical formula of the new compound?
How can we find the correct answers for the pre/post assessments?
- Tue Oct 02, 2018 1:19 pm
- Forum: Balancing Chemical Reactions
- Topic: Audio Visual Focus Topics Balancing Chemical Equations Pre Assessment
- Replies: 2
- Views: 184
Audio Visual Focus Topics Balancing Chemical Equations Pre Assessment
Question #17 states, "During a summer camping weekend 4 moles of butane (C4H10) gas were used for cooking. Chose the right balanced equation for the combustion of 4 moles of butane gas. What is the net number of moles of gas produced?" How do you calculate the net number of moles of gas pr...
- Tue Oct 02, 2018 1:14 pm
- Forum: Empirical & Molecular Formulas
- Topic: Audio Visual Focus Topic Empirical and Molecular Formulas Pre-Assessment
- Replies: 2
- Views: 307
Audio Visual Focus Topic Empirical and Molecular Formulas Pre-Assessment
Question 14 on the Empirical and Molecular Formulas pre-test states, "If vitamin C is 40.9% C, 4.58% H, and 54.5% O what is its empirical formula?"
Are these percentages referring to mass percentage of each element within vitamin C?
Are these percentages referring to mass percentage of each element within vitamin C?