CHEMISTRY COMMUNITY

Kelsey Li 3B

The final will cover everything from the beginning to acids & bases but we are focusing on the strong acids and bases. The final will be 8 questions long just like the midterm.

Kelsey Li 3B

I agree with knowing about cisplatin especially because it was an example on the churro practice exam.

Kelsey Li 3B

When we are asked for the shape then we respond with the molecular geometry, not the electronic geometry.

Kelsey Li 3B

thank you for the final review it really helped!

Kelsey Li 3B

Double and triple bonds do not change the hybridization of an atom. It only changes with the amount of electron densities.

Kelsey Li 3B

You should draw the Lewis structure first then count the electron densities. What I also do is I look at the shape that the central atom is a part of and determine its hybridization from it.

Kelsey Li 3B

Every bond in a molecule is considered a sigma bond. But bonds on top of those are considered pi bonds.

Kelsey Li 3B

The AXE notation is on the exam and it will probably be the same on the final.

Kelsey Li 3B

The bond angles for seesaw is <90 and <120 degrees,

Kelsey Li 3B

Bent and angular are the same shape,

Kelsey Li 3B

You don't need to know the exact bond angle but you should know something along the lines of less than 109.5 degrees if you don't know the specifics.

Kelsey Li 3B

Because T-shaped came up in some homework problems, I would just know the shape in case it were to come up on the test.

Kelsey Li 3B

A VSEPR model shape is not always polar. Polarity depends on the symmetry of the molecule and even if the molecule has lone pairs, it doesn't have to be polar because lone pairs can cancel out.

Kelsey Li 3B

The significance of the bonds being as far as apart from each other is to explain that the molecule is most stable when electrons are far away from each other as possible and this is because their negative charges repel each other.

Kelsey Li 3B

To figure out the length of the bond, you look at the amount of bonded electrons. The higher the bonded electrons, the stronger the pull between the two atoms which means a shorter bond length.

Kelsey Li 3B

Isoelectronic means that the two atoms have the same number of valence electrons

Kelsey Li 3B

Hydrogen bonds occur when an O,N or F atom that has a lone pair interacts with the H that is bonded to another N,O or F atom. Polar covalent bonds occur when a pair of electrons aren't equally shared between atoms and it's from one atom having a higher electronegativity than the other Non polar cova...

Kelsey Li 3B

Hydrogen bonds happen between molecules.

Kelsey Li 3B

If it is a linear shape, the two atoms on either side of the central atom doesn't have to be the same element.

Kelsey Li 3B

If the momentum isn't given, you just solve for momentum with the equation p = mv where m is the mass (kg) and v is the velocity (m/s)

Kelsey Li 3B

Since we didn't learn the VESPR orientation yet I don't think we need to worry about bond angles. What's most important is just making sure when you draw your lewis dot structure that it's drawn evenly. The lewis dot structure just represent where the electrons are and the type of bonds but we don't...

Kelsey Li 3B

I think it's around 8 questions but there will be multiple parts to it (a,b,c,d,e) and we will have just two hours to solve them all. Hopefully we have enough time to be able to finish and review our answers.

Kelsey Li 3B

The S, p, d, and f symbols represent the angular momentum number and orbitals
s, l=0; p, l=1; d, l=2; f, l=3
An example is 5p, n = 5 and l =1

Kelsey Li 3B

Quadruple bonds are extremely rare so I don't think for this class we need to worry about it.

Kelsey Li 3B

The ionization energy is the energy required to remove an electron from a neutral atom whereas the electron affinity is the energy change when a neutral atom attracts an electron.

Kelsey Li 3B

The quantum number L represents the orbital angular momentum which is the shape of the orbital. l is typically n-1 where n is a whole number integer from 1-7.
L values correspond with the shape of the orbital (s,p,d,f). When l=0 it is s. When l=1, it is p. When l=2, it is d. When l=3, it is f.

Kelsey Li 3B

The difference between the orbitals of s,p,d, and f is the shape of the orbital. Within these orbitals are subshells and s=1, p=3, d=5, and f=7.

Kelsey Li 3B

n stands for the principle quantum number and is categorized by whole number integers ranging from 1-7 l stands for the angular momentum number and describes the shape of the orbital(s, p, d, f) and is usually an integer of n-1 ml stands for the magnetic quantum number and describes the 3d orientati...

Kelsey Li 3B

I would first convert the speed and mass. I would change 92mph to m/s which is 41 m/s and the 5.51 ounce to kg which is 0.146 kg.
Then use De Broglie's equation, λ = h / mv = ( 6.64 x 10^-34 J-s ) / ( .146 kg ) ( 41 m/s ) which will give you λ = 1.1 x 10^-34 m.
Hope this helps (:

Kelsey Li 3B

Since wavelengths are so small, using nanometers would better suit the answer in units. However, when you are solving the problem I would suggest sticking to meters or at least the same unit throughout so you don't have any complications. Just like what 804991762_4A said, you can convert meters to n...

Kelsey Li 3B

As we talked in class, De Brogile Equation is λ = h / (mass x velocity) and this is just used to measure the wavelength of moving particles. H represents Planck's Constant which is 6.626 × 10^-34 m^2 kg/s. Also remember to make sure all units are the same so that it cancels correctly. This equation ...

Kelsey Li 3B

I would continue to go with what you were taught with in the fact that you should round up if you have a number ending with 5. Therefore if it was 2.65 I would round it to 2.7 still. If you are still really unsure I would go ask a TA but I'm sure they'll tell you that it's okay to round up! Hope thi...

Kelsey Li 3B

I took AP Chemistry my Junior year in highschool and I feel like I've definitely forgotten a lot of things. However, working on the modules and the practice problems that Professor Lavelle assigned will do a great amount of help. Just like what others said, there are other websites that can help cla...

Kelsey Li 3B

Formula units refer to the concept that one mole contains the Avogadro's number of any units. This means that one moles is equal to 6.022*10^23 formula units which is also equivalent to 6.022*10^23 molecules. Formula units just refer to ionic compounds while molecules refer to molecular compounds. H...

CHEMISTRY COMMUNITY

Search found 34 matches

Re: Final

Re: What should we know for the final?

Re: Shape

Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]

Re: Double and Triple Bonds

Re: hybridization

Re: Sigma bonds

Re: VSEPR Notation

Re: Seesaw

Re: Bent vs angular?

Re: How to state bond angles.

Re: Shapes Not covered in Lecture

Re: Polarity

Re: Atom Distance, repulsion?

Re: Double bond

Re: Isoelectronic

Re: Bond types

Re: Hydrogen Bonding

Re: Molecular Shape

Re: Momentum

Re: Drawing Lewis Structures

Re: Midterm

Re: Electron Configuration

Re: Bond

Re: Electron Affinity vs. Ionization Energy [ENDORSED]

Re: Quantum Number L [ENDORSED]

Re: s, p, d, f

Re: Quantum numbers, shells, subshells

Re: wavelength and ounces

Re: Wavelength Units

Re: De Brogile Equation

Re: Rounding numbers ending in 5

Re: Rusty on High School Chem [ENDORSED]

Re: Formula Units?