Search found 51 matches
- Tue Dec 03, 2019 8:04 pm
- Forum: Naming
- Topic: Polydentate ligands
- Replies: 1
- Views: 35
Polydentate ligands
What are some examples of polydentate ligands besides EDTA ? How can you tell from the formula if it is a polydentate ligand?
- Tue Dec 03, 2019 3:54 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: pH, pKa, pKb
- Replies: 5
- Views: 127
Re: pH, pKa, pKb
pKa and pKb is the measure of the strength of the acid or base. pH is the measure of the concentration of h+ protons.
- Tue Dec 03, 2019 3:52 pm
- Forum: Resonance Structures
- Topic: Delocalization
- Replies: 6
- Views: 274
Re: Delocalization
Resonance is the delocalization of electrons. Thus, if you have a structure with resonance, delocalization is occurring.
- Tue Dec 03, 2019 3:51 pm
- Forum: Biological Examples
- Topic: Biological Examples
- Replies: 4
- Views: 81
Biological Examples
What do we need to know about myoglobin and hemoglobin for the final exam?
- Tue Dec 03, 2019 3:51 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Atomic Spectra
- Replies: 3
- Views: 152
Atomic Spectra
When calculating the frequency of energy absorbed or emitted from changing levels of energy, which equations will be used in the problem?
- Tue Dec 03, 2019 3:49 pm
- Forum: Biological Examples
- Topic: Hydrogen Bonding sites
- Replies: 8
- Views: 160
Hydrogen Bonding sites
How can you tell how many hydrogen bonding sites there are?
- Tue Nov 26, 2019 4:15 am
- Forum: Dipole Moments
- Topic: Dipole Moment
- Replies: 10
- Views: 319
Re: Dipole Moment
The difference in electronegativities dictates the size of the dipole moment.
- Tue Nov 26, 2019 4:13 am
- Forum: Sigma & Pi Bonds
- Topic: Unhybridized Orbital vs Spin Pair?
- Replies: 8
- Views: 129
Re: Unhybridized Orbital vs Spin Pair?
Unhybridized orbital because electron repulsion causes too much energy cost for an electron.
- Tue Nov 26, 2019 4:11 am
- Forum: Naming
- Topic: -ate ending
- Replies: 8
- Views: 114
Re: -ate ending
If the complex is negatively charged, -ate is added to the TM.
- Tue Nov 26, 2019 4:10 am
- Forum: Sigma & Pi Bonds
- Topic: Promotion
- Replies: 5
- Views: 266
Re: Promotion
A promotion occurs during hybridization when an atom needs to form a certain amount of bonds. For instance, carbon needs to bond 4 times. During hybiridzation we promote on electron in order to occupy space in an extra orbital.
Re: 9C.1 c)
Since it has a negative charge, cobalt would turn to -ate.
- Fri Nov 22, 2019 2:06 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Which shape
- Replies: 6
- Views: 95
Re: Which shape
If the dipoles in the molecule do not cancel out, then the molecule will be polar.
- Fri Nov 22, 2019 2:04 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Transplatin
- Replies: 3
- Views: 62
Re: Transplatin
Transplatin is not a chemotherapy drug because it cannot form a coordination compound with the DNA. Since it has its Cls on opposite sides, it cannot align with the DNA and bond.
- Fri Nov 22, 2019 1:59 am
- Forum: Biological Examples
- Topic: Cisplatin
- Replies: 4
- Views: 129
Re: Cisplatin
Cisplatin stops cell division because they have their Cls on the same side of cisplatin. When cisplatin is administered, the Nitrogens along the guanine will displace the Cls on the Cisplatin which causes the bond to be blocked when it is being replicated.
- Fri Nov 22, 2019 1:50 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: london forces
- Replies: 9
- Views: 105
Re: london forces
London forces is dependent on the size of the molecule. Thus, just look for the larger molar mass.
- Sun Nov 17, 2019 2:28 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Preferential
- Replies: 3
- Views: 49
Preferential
How does an atom having preference affect the molecular shape ? Dr. Lavelle brought up several times how Fluorine will change the dynamic since it has preference.
- Thu Nov 14, 2019 5:44 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular Shape Name
- Replies: 17
- Views: 335
Re: Molecular Shape Name
It would be helpful to be familiar with all names not just the most common.
- Thu Nov 14, 2019 5:42 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Resonance VSEPR
- Replies: 6
- Views: 78
Re: Resonance VSEPR
Dr. Lavelle said as long as you draw one structure of the resonance molecule then you should be fine. We are looking at the molecular geometry of one resonance structure. Since a resonance structure is a blend of all structures, their molecular geometries should be the same across all resonance stru...
- Thu Nov 14, 2019 5:35 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 2E.25
- Replies: 2
- Views: 25
Re: 2E.25
When trying to find out if a molecule is polar or non-polar, write all the dipole moments and see if they cancel out. If the dipole moments do not cancel out, then the molecule is polar. If the dipole moments do cancel out, then the molecule is non-polar. Since SF4 has 4 bonds and one lone pair, the...
- Thu Nov 14, 2019 5:29 pm
- Forum: Lewis Structures
- Topic: Homework Problem 2A.3 (omit C)
- Replies: 2
- Views: 72
Re: Homework Problem 2A.3 (omit C)
When you add two electrons to the element sulfur, the ground state configuration leads you to Ar. The fact that Ar happens to be a noble gas is why the answer was abbreviated.
- Tue Nov 12, 2019 12:01 am
- Forum: Dipole Moments
- Topic: Melting point due to dipole-dipole interaction
- Replies: 2
- Views: 28
Melting point due to dipole-dipole interaction
Why would C4H9OH have a higher melting point than C2H5OC2H5?
- Mon Nov 11, 2019 8:58 am
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Anions
- Replies: 7
- Views: 108
Re: Anions
Polarizability depends on size and charge. No assumptions can be made since each element has a different amount of electrons. The more electrons the farther they are away which allows the nucleus to not have a strong hold on them. Thus, the more electrons the easier it is to have a dipole moment bec...
- Mon Nov 11, 2019 8:51 am
- Forum: Electronegativity
- Topic: dipole moments
- Replies: 7
- Views: 85
Re: dipole moments
Yes, electronegativity is how much an atom can attract electrons. A dipole moment is when one atom is strongly attracting the electrons more than the other. Thus, the dipole moment is centered from electronegativity.
- Mon Nov 11, 2019 8:49 am
- Forum: Bond Lengths & Energies
- Topic: Size
- Replies: 13
- Views: 162
Re: Size
As an atom increases, they have more electrons which causes more electron repulsion.
- Mon Nov 11, 2019 8:47 am
- Forum: Hybridization
- Topic: Determining how many electron densities
- Replies: 5
- Views: 303
Re: Determining how many electron densities
Lone pairs count as electron densities.
- Mon Nov 11, 2019 8:46 am
- Forum: Hybridization
- Topic: Noble Configuration vs. Full
- Replies: 7
- Views: 94
Re: Noble Configuration vs. Full
The question will specify if it wants it or not.
- Tue Nov 05, 2019 11:37 am
- Forum: Lewis Structures
- Topic: Midterm
- Replies: 3
- Views: 95
Midterm
Will hybridization be on the midterm ?
- Sun Nov 03, 2019 10:50 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: isoelectronic definition
- Replies: 7
- Views: 109
Re: isoelectronic definition
Isoelectronic means atoms and ions with the same number of electrons.
- Sun Nov 03, 2019 10:48 am
- Forum: Formal Charge and Oxidation Numbers
- Topic: Purpose of Formal Charge
- Replies: 6
- Views: 78
Re: Purpose of Formal Charge
The purpose of calculating formal charge is to allow you to check if your lewis structure has the lowest energy possible. The least amount of formal charges you have the better.
- Sun Nov 03, 2019 10:46 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Cu and Cr
- Replies: 11
- Views: 108
Re: Cu and Cr
Yes. Since all the elements in that column have the same number of valance electrons they will follow the same exception.
- Sun Nov 03, 2019 10:43 am
- Forum: Lewis Structures
- Topic: Bonds
- Replies: 4
- Views: 82
Re: Bonds
Drawing lewis structures is really just trial and error. If you draw a full lewis structure and realize you have too many electrons surrounding the elements, then a double bond has to be used. If you still have too many electrons after you have done a double bond, then a triple bond needs to be used.
- Sun Nov 03, 2019 10:35 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Second Ionization energy
- Replies: 1
- Views: 47
Re: Second Ionization energy
Removing the second electron will always be more difficult than the first because once one electron is removed it makes the net charge positive. Once the net charge is positive, the element will hold on to it's electrons more tightly which in turns means it is harder to remove a second.
- Sun Nov 03, 2019 10:31 am
- Forum: Resonance Structures
- Topic: Resonance Stability
- Replies: 3
- Views: 47
Re: Resonance Stability
Resonance is more stable since it has the ability to have different arrangement of electrons. Resonance allows multiple bond characters which lowers the energy of the arrangement of atoms.
- Fri Oct 25, 2019 6:21 pm
- Forum: Lewis Structures
- Topic: D-block
- Replies: 2
- Views: 53
D-block
How do we determine the amount of valance electrons the D-block elements have ?
- Fri Oct 25, 2019 6:15 pm
- Forum: Lewis Structures
- Topic: Anion
- Replies: 7
- Views: 113
Anion
How would I represent an anion in a lewis structure?
- Fri Oct 25, 2019 6:09 pm
- Forum: Sigma & Pi Bonds
- Topic: Pi bonds
- Replies: 3
- Views: 64
Pi bonds
What are Pi bonds? How do they contribute to a lewis structure?
- Fri Oct 25, 2019 6:07 pm
- Forum: Resonance Structures
- Topic: Delocalized
- Replies: 4
- Views: 74
Re: Delocalized
Delocalized means that the electrons are not associated with one atom. Instead they can move around.
- Fri Oct 25, 2019 6:04 pm
- Forum: Ionic & Covalent Bonds
- Topic: Bond length
- Replies: 11
- Views: 122
Re: Bond length
The significance of this example was resonance because we are visually seeing how different arrangements of electrons can be written in several ways. The importance of bond length in this example is that the average of the atom is a hybrid.
- Fri Oct 25, 2019 6:01 pm
- Forum: Lewis Structures
- Topic: Resonance or Lone pair?
- Replies: 2
- Views: 76
Re: Resonance or Lone pair?
Resonance is determined when a lewis structure has multiple bonds in different locations that are the same as each other.
- Fri Oct 18, 2019 3:09 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Heisenberg's uncertainty
- Replies: 2
- Views: 45
Heisenberg's uncertainty
What is the importance of the photons and electrons untangling and what effect does it have on Heisenberg's Indeterminacy Equation?
- Fri Oct 18, 2019 2:55 pm
- Forum: Significant Figures
- Topic: sig figs and periodic tables
- Replies: 11
- Views: 420
Re: sig figs and periodic tables
The periodic table Prof. Lavelle provided is good.
- Fri Oct 18, 2019 2:46 pm
- Forum: DeBroglie Equation
- Topic: Rydberg and De Brogile
- Replies: 3
- Views: 80
Rydberg and De Brogile
In problems, how do we know when to use these two concepts?
- Fri Oct 18, 2019 2:45 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Cr and Cu
- Replies: 5
- Views: 61
Cr and Cu
Why are Cr and Cu considered exceptions?
- Fri Oct 18, 2019 2:41 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Best Way To Study?
- Replies: 56
- Views: 1319
Re: Best Way To Study?
I use khan academy as another resource when I feel like I did not grasp the concept fully. It provides extra support and practice problems !
- Fri Oct 11, 2019 1:55 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing Chemical Reactions
- Replies: 20
- Views: 554
Re: Balancing Chemical Reactions
Always balance the elements that stand alone VS. balancing the elements that have several others attached to them. For example, Li3N (s) + H2 (g) -> LiNH2 (s) + LiH (s) I would only work with balancing H2 and LiH. Li3N (s) + 2H2 (g) -> LiNH2 (s) + 2LiH (s).
- Fri Oct 11, 2019 1:43 pm
- Forum: SI Units, Unit Conversions
- Topic: Showing work/ rearranging equations
- Replies: 8
- Views: 298
Re: Showing work/ rearranging equations
Doing the problem is up to you and what your preference is. The process is still the same whether you rearrange it immediately or not.
- Fri Oct 11, 2019 1:38 pm
- Forum: Properties of Light
- Topic: Types of Light Series
- Replies: 3
- Views: 63
Re: Types of Light Series
The Paschen and Brackett series use lower energy, and they are on the lower scale of infrared region.
- Fri Oct 11, 2019 1:35 pm
- Forum: Properties of Light
- Topic: Energy Levels and Color of light
- Replies: 4
- Views: 74
Re: Energy Levels and Color of light
When light is emitted, an electron goes from high orbit to low orbit and the electron is absorbed when going from low orbit to high orbit. The difference of energy between two orbitals determines the energy and frequency of light emitted. Thus, different frequencies equate to different wavelengths, ...
- Wed Oct 09, 2019 1:36 pm
- Forum: SI Units, Unit Conversions
- Topic: SI Units
- Replies: 2
- Views: 118
SI Units
What is the unit for 1 angstrom?
- Thu Oct 03, 2019 11:04 am
- Forum: Significant Figures
- Topic: Determining Sig Fig's
- Replies: 5
- Views: 136
Re: Determining Sig Fig's
Whether you are adding, subtracting, multiplying, or dividing, the ground rule is to have the same amount of sig figs as the value with the lowest amount of sig figs.
- Tue Oct 01, 2019 2:53 pm
- Forum: Balancing Chemical Reactions
- Topic: Tips for Balancing Chemical Equations [ENDORSED]
- Replies: 14
- Views: 296
Re: Tips for Balancing Chemical Reactions [ENDORSED]
I begin by balancing the element that shows up the least then I move on to the next. The posts above sum up the process pretty well though!