Search found 51 matches

by AprilPaz
Tue Dec 03, 2019 8:04 pm
Forum: Naming
Topic: Polydentate ligands
Replies: 1
Views: 23

Polydentate ligands

What are some examples of polydentate ligands besides EDTA ? How can you tell from the formula if it is a polydentate ligand?
by AprilPaz
Tue Dec 03, 2019 3:54 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: pH, pKa, pKb
Replies: 5
Views: 87

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.
by AprilPaz
Tue Dec 03, 2019 3:52 pm
Forum: Resonance Structures
Topic: Delocalization
Replies: 5
Views: 210

Re: Delocalization

Resonance is the delocalization of electrons. Thus, if you have a structure with resonance, delocalization is occurring.
by AprilPaz
Tue Dec 03, 2019 3:51 pm
Forum: Biological Examples
Topic: Biological Examples
Replies: 4
Views: 69

Biological Examples

What do we need to know about myoglobin and hemoglobin for the final exam?
by AprilPaz
Tue Dec 03, 2019 3:51 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectra
Replies: 3
Views: 132

Atomic Spectra

When calculating the frequency of energy absorbed or emitted from changing levels of energy, which equations will be used in the problem?
by AprilPaz
Tue Dec 03, 2019 3:49 pm
Forum: Biological Examples
Topic: Hydrogen Bonding sites
Replies: 8
Views: 84

Hydrogen Bonding sites

How can you tell how many hydrogen bonding sites there are?
by AprilPaz
Tue Nov 26, 2019 4:15 am
Forum: Dipole Moments
Topic: Dipole Moment
Replies: 10
Views: 253

Re: Dipole Moment

The difference in electronegativities dictates the size of the dipole moment.
by AprilPaz
Tue Nov 26, 2019 4:13 am
Forum: Sigma & Pi Bonds
Topic: Unhybridized Orbital vs Spin Pair?
Replies: 8
Views: 68

Re: Unhybridized Orbital vs Spin Pair?

Unhybridized orbital because electron repulsion causes too much energy cost for an electron.
by AprilPaz
Tue Nov 26, 2019 4:11 am
Forum: Naming
Topic: -ate ending
Replies: 8
Views: 97

Re: -ate ending

If the complex is negatively charged, -ate is added to the TM.
by AprilPaz
Tue Nov 26, 2019 4:10 am
Forum: Sigma & Pi Bonds
Topic: Promotion
Replies: 5
Views: 203

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.
by AprilPaz
Tue Nov 26, 2019 4:05 am
Forum: Naming
Topic: 9C.1 c)
Replies: 2
Views: 29

Re: 9C.1 c)

Since it has a negative charge, cobalt would turn to -ate.
by AprilPaz
Fri Nov 22, 2019 2:06 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Which shape
Replies: 6
Views: 70

Re: Which shape

If the dipoles in the molecule do not cancel out, then the molecule will be polar.
by AprilPaz
Fri Nov 22, 2019 2:04 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Transplatin
Replies: 3
Views: 38

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.
by AprilPaz
Fri Nov 22, 2019 1:59 am
Forum: Biological Examples
Topic: Cisplatin
Replies: 4
Views: 88

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.
by AprilPaz
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: 93

Re: london forces

London forces is dependent on the size of the molecule. Thus, just look for the larger molar mass.
by AprilPaz
Sun Nov 17, 2019 2:28 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Preferential
Replies: 3
Views: 45

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.
by AprilPaz
Thu Nov 14, 2019 5:44 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape Name
Replies: 17
Views: 269

Re: Molecular Shape Name

It would be helpful to be familiar with all names not just the most common.
by AprilPaz
Thu Nov 14, 2019 5:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Resonance VSEPR
Replies: 6
Views: 66

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...
by AprilPaz
Thu Nov 14, 2019 5:35 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.25
Replies: 2
Views: 23

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...
by AprilPaz
Thu Nov 14, 2019 5:29 pm
Forum: Lewis Structures
Topic: Homework Problem 2A.3 (omit C)
Replies: 2
Views: 45

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.
by AprilPaz
Tue Nov 12, 2019 12:01 am
Forum: Dipole Moments
Topic: Melting point due to dipole-dipole interaction
Replies: 2
Views: 26

Melting point due to dipole-dipole interaction

Why would C4H9OH have a higher melting point than C2H5OC2H5?
by AprilPaz
Mon Nov 11, 2019 8:58 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Anions
Replies: 7
Views: 59

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...
by AprilPaz
Mon Nov 11, 2019 8:51 am
Forum: Electronegativity
Topic: dipole moments
Replies: 7
Views: 69

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.
by AprilPaz
Mon Nov 11, 2019 8:49 am
Forum: Bond Lengths & Energies
Topic: Size
Replies: 9
Views: 104

Re: Size

As an atom increases, they have more electrons which causes more electron repulsion.
by AprilPaz
Mon Nov 11, 2019 8:47 am
Forum: Hybridization
Topic: Determining how many electron densities
Replies: 5
Views: 262

Re: Determining how many electron densities

Lone pairs count as electron densities.
by AprilPaz
Mon Nov 11, 2019 8:46 am
Forum: Hybridization
Topic: Noble Configuration vs. Full
Replies: 7
Views: 88

Re: Noble Configuration vs. Full

The question will specify if it wants it or not.
by AprilPaz
Tue Nov 05, 2019 11:37 am
Forum: Lewis Structures
Topic: Midterm
Replies: 3
Views: 63

Midterm

Will hybridization be on the midterm ?
by AprilPaz
Sun Nov 03, 2019 10:50 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: isoelectronic definition
Replies: 7
Views: 92

Re: isoelectronic definition

Isoelectronic means atoms and ions with the same number of electrons.
by AprilPaz
Sun Nov 03, 2019 10:48 am
Forum: Formal Charge and Oxidation Numbers
Topic: Purpose of Formal Charge
Replies: 6
Views: 62

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.
by AprilPaz
Sun Nov 03, 2019 10:46 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Cu and Cr
Replies: 11
Views: 100

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.
by AprilPaz
Sun Nov 03, 2019 10:43 am
Forum: Lewis Structures
Topic: Bonds
Replies: 4
Views: 57

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.
by AprilPaz
Sun Nov 03, 2019 10:35 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Second Ionization energy
Replies: 1
Views: 32

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.
by AprilPaz
Sun Nov 03, 2019 10:31 am
Forum: Resonance Structures
Topic: Resonance Stability
Replies: 3
Views: 44

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.
by AprilPaz
Fri Oct 25, 2019 6:21 pm
Forum: Lewis Structures
Topic: D-block
Replies: 2
Views: 52

D-block

How do we determine the amount of valance electrons the D-block elements have ?
by AprilPaz
Fri Oct 25, 2019 6:15 pm
Forum: Lewis Structures
Topic: Anion
Replies: 7
Views: 97

Anion

How would I represent an anion in a lewis structure?
by AprilPaz
Fri Oct 25, 2019 6:09 pm
Forum: Sigma & Pi Bonds
Topic: Pi bonds
Replies: 3
Views: 59

Pi bonds

What are Pi bonds? How do they contribute to a lewis structure?
by AprilPaz
Fri Oct 25, 2019 6:07 pm
Forum: Resonance Structures
Topic: Delocalized
Replies: 4
Views: 67

Re: Delocalized

Delocalized means that the electrons are not associated with one atom. Instead they can move around.
by AprilPaz
Fri Oct 25, 2019 6:04 pm
Forum: Ionic & Covalent Bonds
Topic: Bond length
Replies: 11
Views: 110

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.
by AprilPaz
Fri Oct 25, 2019 6:01 pm
Forum: Lewis Structures
Topic: Resonance or Lone pair?
Replies: 2
Views: 64

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.
by AprilPaz
Fri Oct 18, 2019 3:09 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg's uncertainty
Replies: 2
Views: 42

Heisenberg's uncertainty

What is the importance of the photons and electrons untangling and what effect does it have on Heisenberg's Indeterminacy Equation?
by AprilPaz
Fri Oct 18, 2019 2:55 pm
Forum: Significant Figures
Topic: sig figs and periodic tables
Replies: 11
Views: 398

Re: sig figs and periodic tables

The periodic table Prof. Lavelle provided is good.
by AprilPaz
Fri Oct 18, 2019 2:46 pm
Forum: DeBroglie Equation
Topic: Rydberg and De Brogile
Replies: 3
Views: 79

Rydberg and De Brogile

In problems, how do we know when to use these two concepts?
by AprilPaz
Fri Oct 18, 2019 2:45 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Cr and Cu
Replies: 5
Views: 60

Cr and Cu

Why are Cr and Cu considered exceptions?
by AprilPaz
Fri Oct 18, 2019 2:41 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Best Way To Study?
Replies: 56
Views: 1172

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 !
by AprilPaz
Fri Oct 11, 2019 1:55 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical Reactions
Replies: 20
Views: 502

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).
by AprilPaz
Fri Oct 11, 2019 1:43 pm
Forum: SI Units, Unit Conversions
Topic: Showing work/ rearranging equations
Replies: 8
Views: 237

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.
by AprilPaz
Fri Oct 11, 2019 1:38 pm
Forum: Properties of Light
Topic: Types of Light Series
Replies: 3
Views: 57

Re: Types of Light Series

The Paschen and Brackett series use lower energy, and they are on the lower scale of infrared region.
by AprilPaz
Fri Oct 11, 2019 1:35 pm
Forum: Properties of Light
Topic: Energy Levels and Color of light
Replies: 4
Views: 68

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, ...
by AprilPaz
Wed Oct 09, 2019 1:36 pm
Forum: SI Units, Unit Conversions
Topic: SI Units
Replies: 2
Views: 96

SI Units

What is the unit for 1 angstrom?
by AprilPaz
Thu Oct 03, 2019 11:04 am
Forum: Significant Figures
Topic: Determining Sig Fig's
Replies: 5
Views: 92

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.
by AprilPaz
Tue Oct 01, 2019 2:53 pm
Forum: Balancing Chemical Reactions
Topic: Tips for Balancing Chemical Equations [ENDORSED]
Replies: 14
Views: 248

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!

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