Search found 34 matches
- Sat Dec 08, 2018 2:50 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 11
- Views: 1279
Re: Final
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.
- Sat Dec 08, 2018 2:49 pm
- Forum: Biological Examples
- Topic: What should we know for the final?
- Replies: 9
- Views: 982
Re: What should we know for the final?
I agree with knowing about cisplatin especially because it was an example on the churro practice exam.
- Sat Dec 08, 2018 2:48 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Shape
- Replies: 5
- Views: 531
Re: Shape
When we are asked for the shape then we respond with the molecular geometry, not the electronic geometry.
- Sat Dec 08, 2018 2:47 pm
- Forum: Administrative Questions and Class Announcements
- Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
- Replies: 118
- Views: 20763
Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
thank you for the final review it really helped!
- Sun Dec 02, 2018 11:14 pm
- Forum: Hybridization
- Topic: Double and Triple Bonds
- Replies: 17
- Views: 4218
Re: Double and Triple Bonds
Double and triple bonds do not change the hybridization of an atom. It only changes with the amount of electron densities.
- Sun Dec 02, 2018 11:13 pm
- Forum: Hybridization
- Topic: hybridization
- Replies: 13
- Views: 1736
Re: hybridization
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.
- Sun Dec 02, 2018 11:12 pm
- Forum: Hybridization
- Topic: Sigma bonds
- Replies: 9
- Views: 838
Re: Sigma bonds
Every bond in a molecule is considered a sigma bond. But bonds on top of those are considered pi bonds.
- Sun Dec 02, 2018 11:11 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR Notation
- Replies: 10
- Views: 1161
Re: VSEPR Notation
The AXE notation is on the exam and it will probably be the same on the final.
- Sun Dec 02, 2018 11:10 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Seesaw
- Replies: 13
- Views: 2004
Re: Seesaw
The bond angles for seesaw is <90 and <120 degrees,
- Sun Dec 02, 2018 11:09 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent vs angular?
- Replies: 15
- Views: 1126
Re: Bent vs angular?
Bent and angular are the same shape,
- Sun Nov 25, 2018 3:51 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: How to state bond angles.
- Replies: 7
- Views: 720
Re: How to state bond angles.
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.
- Sun Nov 25, 2018 3:50 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Shapes Not covered in Lecture
- Replies: 10
- Views: 1077
Re: Shapes Not covered in Lecture
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.
- Sun Nov 25, 2018 3:49 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polarity
- Replies: 6
- Views: 534
Re: Polarity
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.
- Sat Nov 10, 2018 11:13 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Atom Distance, repulsion?
- Replies: 6
- Views: 877
Re: Atom Distance, repulsion?
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.
- Sat Nov 10, 2018 11:12 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Double bond
- Replies: 5
- Views: 720
Re: Double bond
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.
- Sat Nov 10, 2018 11:11 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Isoelectronic
- Replies: 14
- Views: 2076
Re: Isoelectronic
Isoelectronic means that the two atoms have the same number of valence electrons
- Sat Nov 10, 2018 11:08 pm
- Forum: Hybridization
- Topic: Bond types
- Replies: 4
- Views: 614
Re: Bond types
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...
- Sat Nov 10, 2018 11:02 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Hydrogen Bonding
- Replies: 2
- Views: 228
Re: Hydrogen Bonding
Hydrogen bonds happen between molecules.
- Sat Nov 10, 2018 10:59 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular Shape
- Replies: 2
- Views: 299
Re: Molecular Shape
If it is a linear shape, the two atoms on either side of the central atom doesn't have to be the same element.
- Fri Nov 02, 2018 12:10 pm
- Forum: DeBroglie Equation
- Topic: Momentum
- Replies: 10
- Views: 1413
Re: Momentum
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)
- Fri Nov 02, 2018 12:09 pm
- Forum: Lewis Structures
- Topic: Drawing Lewis Structures
- Replies: 14
- Views: 1982
Re: Drawing Lewis Structures
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...
- Fri Nov 02, 2018 12:06 pm
- Forum: Student Social/Study Group
- Topic: Midterm
- Replies: 15
- Views: 1481
Re: Midterm
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.
- Sun Oct 28, 2018 9:49 am
- Forum: Lewis Structures
- Topic: Electron Configuration
- Replies: 4
- Views: 463
Re: Electron Configuration
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
s, l=0; p, l=1; d, l=2; f, l=3
An example is 5p, n = 5 and l =1
- Sun Oct 28, 2018 9:45 am
- Forum: Ionic & Covalent Bonds
- Topic: Bond
- Replies: 9
- Views: 864
Re: Bond
Quadruple bonds are extremely rare so I don't think for this class we need to worry about it.
- Sun Oct 28, 2018 9:44 am
- Forum: Ionic & Covalent Bonds
- Topic: Electron Affinity vs. Ionization Energy [ENDORSED]
- Replies: 4
- Views: 454
Re: Electron Affinity vs. Ionization Energy [ENDORSED]
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.
- Fri Oct 19, 2018 4:18 am
- Forum: Quantum Numbers and The H-Atom
- Topic: Quantum Number L [ENDORSED]
- Replies: 3
- Views: 341
Re: Quantum Number L [ENDORSED]
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.
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.
- Fri Oct 19, 2018 4:04 am
- Forum: Trends in The Periodic Table
- Topic: s, p, d, f
- Replies: 16
- Views: 4255
Re: s, p, d, f
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.
- Fri Oct 19, 2018 3:48 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Quantum numbers, shells, subshells
- Replies: 2
- Views: 192
Re: Quantum numbers, shells, subshells
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...
- Sat Oct 13, 2018 7:01 pm
- Forum: Properties of Electrons
- Topic: wavelength and ounces
- Replies: 4
- Views: 363
Re: wavelength and ounces
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 (:
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 (:
- Sat Oct 13, 2018 6:57 pm
- Forum: Properties of Light
- Topic: Wavelength Units
- Replies: 5
- Views: 424
Re: Wavelength Units
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...
- Sat Oct 13, 2018 6:55 pm
- Forum: Properties of Light
- Topic: De Brogile Equation
- Replies: 6
- Views: 311
Re: De Brogile Equation
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 ...
- Sat Oct 06, 2018 2:08 pm
- Forum: Significant Figures
- Topic: Rounding numbers ending in 5
- Replies: 9
- Views: 848
Re: Rounding numbers ending in 5
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...
- Sat Oct 06, 2018 2:04 pm
- Forum: General Science Questions
- Topic: Rusty on High School Chem [ENDORSED]
- Replies: 347
- Views: 416078
Re: Rusty on High School Chem [ENDORSED]
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...
- Sat Oct 06, 2018 1:58 pm
- Forum: SI Units, Unit Conversions
- Topic: Formula Units?
- Replies: 6
- Views: 663
Re: Formula Units?
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...