Search found 46 matches

by Kyla Grunden 1L
Sat Nov 30, 2019 2:39 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: 17.35 Chelating Compounds
Replies: 5
Views: 532

Re: 17.35 Chelating Compounds

How do you determine at what point the nitrogens are too far away to bond to the same metal atom?
by Kyla Grunden 1L
Fri Nov 29, 2019 8:07 pm
Forum: Naming
Topic: Homework Problem 16.29 Part D
Replies: 5
Views: 708

Re: Homework Problem 16.29 Part D

The "bis" is there because there are two oxalate ions in the compound.
by Kyla Grunden 1L
Fri Nov 29, 2019 7:40 pm
Forum: Naming
Topic: Common Names
Replies: 2
Views: 43

Common Names

Will we be required to know some of the common names of complex ions? For example, apparently [Fe(CN)6]4- does not follow the systematic naming of complex ions and is instead known as Ferricyanide.
by Kyla Grunden 1L
Tue Nov 26, 2019 12:49 pm
Forum: Hybridization
Topic: Delocalized Hybridization
Replies: 2
Views: 15

Delocalized Hybridization

Will we be asked to find the hybridization of structures with delocalized electron pairs? For example, what would be the hybridization of the nitrogen in amide?
by Kyla Grunden 1L
Sun Nov 24, 2019 2:02 pm
Forum: Naming
Topic: Chloro vs Chloride
Replies: 3
Views: 37

Re: Chloro vs Chloride

Here's Dr. Lavelle's lesson on naming compounds, hope this helps! https://lavelle.chem.ucla.edu/wp-conten ... pounds.pdf
by Kyla Grunden 1L
Sun Nov 24, 2019 1:57 pm
Forum: Hybridization
Topic: Lone pairs
Replies: 9
Views: 71

Re: Lone pairs

Like bonded electrons, lone pairs exist in hybrid orbitals. There's no reason, that's just how it works!
by Kyla Grunden 1L
Sun Nov 24, 2019 1:51 pm
Forum: Biological Examples
Topic: Heme complex
Replies: 8
Views: 97

Re: Heme complex

Here's a video I think does a good job of explaining it! https://www.youtube.com/watch?v=_gkbxvIo_nw
by Kyla Grunden 1L
Sun Nov 24, 2019 1:45 pm
Forum: Hybridization
Topic: d-orbitals
Replies: 7
Views: 56

Re: d-orbitals

Yes, they do! I don't think we need to know how, at least at this point in the class. But, here's a website on it if you're curious https://chem.libretexts.org/Courses/Mou ... d_Orbitals
by Kyla Grunden 1L
Sun Nov 24, 2019 1:42 pm
Forum: Dipole Moments
Topic: Hydrogen bonding
Replies: 5
Views: 77

Re: Hydrogen bonding

Potential hydrogen bonding sites of a molecule include the Hydrogens on the molecule as well as the lone pairs on hydrogen, oxygen, nitrogen, and fluorine molecules. For example, water has hydrogen bonding sites on the two hydrogen molecules and the two lone pairs on the oxygen, so it has four hydro...
by Kyla Grunden 1L
Mon Nov 18, 2019 6:28 pm
Forum: Hybridization
Topic: s character
Replies: 1
Views: 31

Re: s character

S-character is number of sigma bonds in hybridization. In sp^3, there is 25% s-character and 75% p-character and the bond angle of sp^3 (tetrahedral) is 109.5. In sp^2 there is 33% s-character and 67% p-character and the bond angle (trigonal planar) is 120. In sp, there is 50% s-character and 50% p-...
by Kyla Grunden 1L
Mon Nov 18, 2019 6:16 pm
Forum: Hybridization
Topic: hybridization
Replies: 4
Views: 41

Re: hybridization

Hybridization is how bonding works.
by Kyla Grunden 1L
Mon Nov 18, 2019 6:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape and Structure
Replies: 1
Views: 23

Re: Molecular Shape and Structure

I don't think there are any homework questions that don't require the application of sigma and pi bonds in hybridization. I imagine because of this any questions on the test will be conceptual and not application.
by Kyla Grunden 1L
Mon Nov 18, 2019 6:11 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Component Orbitals of pi Bonds
Replies: 3
Views: 24

Re: Component Orbitals of pi Bonds

Component orbitals are simply what orbitals hybridize when a bond is made.
by Kyla Grunden 1L
Mon Nov 18, 2019 6:05 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Component Orbitals of pi Bonds
Replies: 3
Views: 24

Re: Component Orbitals of pi Bonds

The component orbitals of pi bonds are p orbitals. The component orbitals of sigma bonds are s orbitals.
by Kyla Grunden 1L
Sun Nov 10, 2019 8:35 pm
Forum: Bond Lengths & Energies
Topic: Hydrogen bonding
Replies: 2
Views: 37

Re: Hydrogen bonding

No, I think this is just an average of the strength of hydrogen bonds that Dr. Lavelle uses to show the relative strengths of the different types of bonds.
by Kyla Grunden 1L
Sun Nov 10, 2019 3:45 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: Strengths of bonds
Replies: 3
Views: 34

Re: Strengths of bonds

Bond strength is determined by a number of factors. Bonds are weakened if the atoms involved are large or if there are lone pairs on nearby atoms. Bond strength is also affected by the electronegativities of the atoms involved and their bond lengths (or resonance). Bond multiplicity or order (how ma...
by Kyla Grunden 1L
Sun Nov 10, 2019 3:24 pm
Forum: Electronegativity
Topic: electronegativity values
Replies: 6
Views: 47

Re: electronegativity values

While you can tell if two atoms are more likely to form an ionic or covalent bond based on other factors, I'm sure if we were being asked to determine based specifically on electronegativity, the values would be provided.
by Kyla Grunden 1L
Sun Nov 10, 2019 3:21 pm
Forum: Electronegativity
Topic: Differences in Electronegativity
Replies: 5
Views: 47

Re: Differences in Electronegativity

No, I believe if we need to determine the differences in electronegativities, a periodic table with electronegativities will be provided.
by Kyla Grunden 1L
Sun Nov 10, 2019 3:19 pm
Forum: Bond Lengths & Energies
Topic: Bond Strength
Replies: 4
Views: 41

Re: Bond Strength

Bond strength is determined by a number of factors besides the number of bonds. Bonds are weakened if the atoms involved are large or if there are lone pairs on nearby atoms. Bond strength is also affected by the electronegativities of the atoms involved and their bond lengths (or resonance).
by Kyla Grunden 1L
Sun Nov 03, 2019 10:14 pm
Forum: *Black Body Radiation
Topic: Midterm
Replies: 3
Views: 124

Re: Midterm

He mentioned in a lecture that we weren't going to go over it, so I think we're good!
by Kyla Grunden 1L
Sun Nov 03, 2019 10:09 pm
Forum: Octet Exceptions
Topic: 2C.11
Replies: 1
Views: 36

Re: 2C.11

A) 2
B)2
C)1
by Kyla Grunden 1L
Sun Nov 03, 2019 10:02 pm
Forum: *Shrodinger Equation
Topic: Hamiltonian
Replies: 3
Views: 132

Re: Hamiltonian

I went to a review session today where the TA basically described the hamiltonian as a variable. In the example problem he gave, it told you what the variable stood for (it was a derived equation) and you simply plugged the given equation into Schrodinger's equation and then defined the variables in...
by Kyla Grunden 1L
Sun Nov 03, 2019 9:56 pm
Forum: Trends in The Periodic Table
Topic: Ionization energy and Electron affinity
Replies: 1
Views: 38

Re: Ionization energy and Electron affinity

Ionization energy is the energy required to remove an electron from an atom. Electron affinity is the energy released or absorbed when an electron is added to an atom.
by Kyla Grunden 1L
Sun Nov 03, 2019 9:51 pm
Forum: Trends in The Periodic Table
Topic: Electronegativity
Replies: 3
Views: 42

Re: Electronegativity

Oxygen has a higher electronegativity. Electronegativity increases across the rows of the periodic table and decreases as you move down the table.
by Kyla Grunden 1L
Sat Oct 26, 2019 11:40 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: oribital numbers
Replies: 7
Views: 69

Re: oribital numbers

Unfortunately, this is just memorization! s has 1 orbital, p has 3, d has 5, and f has 7.

Hope this helps!
by Kyla Grunden 1L
Sat Oct 26, 2019 11:32 am
Forum: Lewis Structures
Topic: Shapes of molecules
Replies: 2
Views: 21

Re: Shapes of molecules

Carbon does not have any unpaired valence electrons: it has 4 single bonds with hydrogen atoms, so the hydrogen atoms are spread out equally in the lewis structure.
by Kyla Grunden 1L
Sat Oct 26, 2019 9:24 am
Forum: Lewis Structures
Topic: Homework 2B 1a)
Replies: 2
Views: 29

Re: Homework 2B 1a)

I'm not sure, I've looked it up and can't find anything, but another good trick is that the least abundant atom is also usually in the middle.
by Kyla Grunden 1L
Sat Oct 26, 2019 9:13 am
Forum: Lewis Structures
Topic: 2B.3
Replies: 1
Views: 32

Re: 2B.3

Bromine is an exception to the octet rule because it's in the fourth period (these exceptions occur after the third period). There are a total of 28 electrons in the molecule (7 in Bromine and 7*3 in Fluoride). There is a single bond between the bromine and each of the fluorides, and the fluorides h...
by Kyla Grunden 1L
Sat Oct 26, 2019 8:47 am
Forum: Trends in The Periodic Table
Topic: Ionization energy
Replies: 12
Views: 165

Re: Ionization energy

I think we should know the general trends for ionization energy, not only because he went over it in class but because it's useful for drawing Lewis structures and understanding other topics.

Ionization energy increases as you move across a period and decreases as you move down groups.
by Kyla Grunden 1L
Sun Oct 20, 2019 9:20 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Noble Gases in Electron Configurations
Replies: 6
Views: 32

Re: Noble Gases in Electron Configurations

Hello,

We use this as a shortcut so we don't have to write so much! My high school chem teacher always said chemists are lazy, if there's an easier way to do something, they'll do it :)
by Kyla Grunden 1L
Sun Oct 20, 2019 9:13 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Summary of how to write electron configurations please
Replies: 2
Views: 23

Re: Summary of how to write electron configurations please

Hello, There are several different ways to write electron configuration, but I think the best way if you're just learning this is to think about how many electrons can fit in each shell and subshell. To do this, here's a quick cheat sheet that will help you figure out the order electrons fill. You e...
by Kyla Grunden 1L
Sun Oct 20, 2019 9:10 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: When do you use a negative sign in the Bohr equation?
Replies: 7
Views: 80

Re: When do you use a negative sign in the Bohr equation?

Hello, I believe there is always a negative sign in Bohr's equation. I looked it up and a previous user on this site said "The negative sign in Bohr's equation is there because E=0 when the electron and neutron are separated completely (when the electron is free). So, as they get closer (or get...
by Kyla Grunden 1L
Sun Oct 20, 2019 8:53 pm
Forum: *Particle in a Box
Topic: Explaining Particle in a Box
Replies: 4
Views: 177

Re: Explaining Particle in a Box

Hello,

For this experiment I think it's better to see it in a video rather than have it explained. Here's a good one: https://www.youtube.com/watch?v=uK60QAKooyM

Hope this helps!
by Kyla Grunden 1L
Sun Oct 20, 2019 8:27 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1E-11
Replies: 4
Views: 60

Re: 1E-11

There are several ways to do this, but I think the best way if you're just learning this is to think about how many electrons can fit in each shell and subshell. To do this, here's a quick cheat sheet that will help you figure out the order electrons fill. You end up accidentally memorizing it prett...
by Kyla Grunden 1L
Sun Oct 13, 2019 6:23 pm
Forum: Properties of Light
Topic: Photoelectric Effect
Replies: 7
Views: 68

Re: Photoelectric Effect

In a post from a few years ago a TA said that water molecules in the air can scatter frequencies, which would make the measurements inaccurate.

Hope this helps!
by Kyla Grunden 1L
Sun Oct 13, 2019 5:46 pm
Forum: DeBroglie Equation
Topic: wave properties of electrons
Replies: 1
Views: 39

Re: wave properties of electrons

To test that electrons have wave-like properties, they treated an electron like it was light. Essentially, they shot an electron through 2 slits. If the electron behaved like a single particle, it would only make a single spot through one of the slits. However, the electron did not do this, it made ...
by Kyla Grunden 1L
Sun Oct 13, 2019 5:25 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Electron Configuration
Replies: 5
Views: 83

Re: Electron Configuration

Remember that s, p, d, and f orbitals are different types of bonds, s orbitals use sigma bonding, p orbitals use pi bonding, and so on. The numbers represent the energy level of the orbital. Within each energy level, there are multiple orbitals. To assign an electron to an orbital and energy level, ...
by Kyla Grunden 1L
Sun Oct 13, 2019 5:03 pm
Forum: Properties of Light
Topic: P.E Experiment
Replies: 2
Views: 45

Re: P.E Experiment

Yes, molecular spectroscopy is used to identify molecules because of the precise frequencies emitted by different molecules. The process of molecular spectroscopy seems pretty complicated, I'll link an article about it below in case you're curious. Hope this helps! https://www.sciencedirect.com/topi...
by Kyla Grunden 1L
Sun Oct 06, 2019 9:16 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical Ratio Rounding
Replies: 6
Views: 94

Empirical Ratio Rounding

Several times I have seen that, when you divide by the smallest molar mass when trying to find the empirical formula, the ratios are not always whole numbers. At what point is it too far to round to find the ratio?
by Kyla Grunden 1L
Sun Oct 06, 2019 9:07 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Word Problem Efficiency
Replies: 7
Views: 215

Re: Word Problem Efficiency

Not sure if this will work for you, but I like to circle all the quantities in the problem and underline key words like "reacts with". It helps me almost visualize the equation in my head. Also, this way I'm not searching through the question to find amounts when I'm doing calculations. Ho...
by Kyla Grunden 1L
Sun Oct 06, 2019 8:54 pm
Forum: SI Units, Unit Conversions
Topic: Unit Conversions
Replies: 6
Views: 122

Re: Unit Conversions

Because we went over them in lecture, I would definitely memorize them, especially for conversions. I think the only thing being given to us is the formula sheet which can be found on the class website under "Constants, Equations, PT".

Hope this helps!
by Kyla Grunden 1L
Sun Oct 06, 2019 8:46 pm
Forum: Balancing Chemical Reactions
Topic: Problem H7d Clarification (Catalysts & Common Compounds)
Replies: 1
Views: 54

Re: Problem H7d Clarification (Catalysts & Common Compounds)

I had the same question regarding if we have to memorize polyatomic ions, my TA said that they will most likely give us the molecular formulas. But I might review them just because I'm paranoid!

Hope this helps!
by Kyla Grunden 1L
Sun Oct 06, 2019 8:28 pm
Forum: Balancing Chemical Reactions
Topic: Combustion
Replies: 17
Views: 508

Re: Combustion

A combustion reaction occurs when a compound is reacted with oxygen, releasing heat and light. I don't think there's any way, or reason, to represent that a reaction is combustion, but the second reactant is always oxygen gas.

Hope this helps!
by Kyla Grunden 1L
Sun Oct 06, 2019 5:33 pm
Forum: Properties of Light
Topic: Unit of Wavelength Amplitude
Replies: 2
Views: 33

Re: Unit of Wavelength Amplitude

Hello,

The unit for amplitude of wavelength is meters (m). This explains why the unit for speed of light is meters per second (m/s): the equation is c= λv, and λ is m, and v is hertz (1/s), so the speed of light is m/s.

Hope this helps!

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