Search found 31 matches
- Sun Dec 09, 2018 10:21 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Grade View
- Replies: 7
- Views: 942
Re: Final Grade View
I think we get our final results one or two weeks after the final exam.
- Sun Dec 09, 2018 10:18 pm
- Forum: Biological Examples
- Topic: Cisplatin
- Replies: 7
- Views: 1314
Re: Cisplatin
Cisplatin is used in chemotherapy and can be used to treat cancer.
- Sun Dec 09, 2018 10:15 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: AX3E
- Replies: 18
- Views: 3288
Re: AX3E
It would be trigonal pyramidal because of the extra lone pair.
- Sun Dec 02, 2018 6:51 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: Hydrogen Bonding
- Replies: 2
- Views: 458
Re: Hydrogen Bonding
Yes, because a dipole moment exists in hydrogen bonding, the molecule is considered to be polar.
- Sun Dec 02, 2018 6:45 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: 4.73
- Replies: 2
- Views: 625
Re: 4.73
Usually radicals have an odd number an electrons because they have at least one unpaired electron.
- Sun Dec 02, 2018 6:44 pm
- Forum: Amphoteric Compounds
- Topic: Examples
- Replies: 6
- Views: 620
Re: Examples
Amphoteric compounds can act as an acid or base. These compounds can be formed from the oxides of metals such as beryllium, zinc, and lead.
- Sun Nov 25, 2018 7:47 pm
- Forum: Octet Exceptions
- Topic: Radicals
- Replies: 16
- Views: 1741
Re: Radicals
Molecules usually with an odd number of electrons will be considered a radical.
- Sun Nov 25, 2018 7:43 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Exam
- Replies: 22
- Views: 1659
Re: Final Exam
I believe that the final will most likely be cumulative.
- Sun Nov 25, 2018 7:36 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 3 material
- Replies: 6
- Views: 735
Re: Test 3 material
I believe Test 3 covers polarity, VSEPR models, and molecular geometry.
- Sun Nov 18, 2018 7:30 pm
- Forum: Bond Lengths & Energies
- Topic: Lengths of different types of bonds
- Replies: 3
- Views: 532
Re: Lengths of different types of bonds
Single bonds are the longest bonds whereas triple bonds are the shortest bonds. Double and triple bonds are much stronger than single bonds and require more energy to break because they have a stronger "hold" on electrons.
- Sun Nov 18, 2018 7:04 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Determining Shape
- Replies: 10
- Views: 970
Re: Determining Shape
In order to determine molecular shape, you should be able to find the steric number, which is the number of atoms and lone pairs bonded to the central atom.
- Sun Nov 18, 2018 6:44 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Thanksgiving week
- Replies: 10
- Views: 1377
Re: Thanksgiving week
Are we able to turn in our homework for Week 8 when we come back from break (Week 9)?
- Sun Nov 11, 2018 4:27 pm
- Forum: Ionic & Covalent Bonds
- Topic: Van der Waals vs Dispersion Forces
- Replies: 8
- Views: 1179
Re: Van der Waals vs Dispersion Forces
There are two different types of Van der Waals forces, which would be London Dispersion forces and stronger dipole-dipole forces.
- Sun Nov 11, 2018 4:25 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: molecular shapes
- Replies: 13
- Views: 976
Re: molecular shapes
Hopefully we will learn more about shapes in lecture or discussion. I found this website that does a good job in explaining the different molecular shapes: http://intro.chem.okstate.edu/1314F00/L ... VSEPR.html
- Sun Nov 11, 2018 4:19 pm
- Forum: Properties of Light
- Topic: Test 3
- Replies: 24
- Views: 2196
Re: Test 3
@MichaelNirula Okay thanks!
- Sun Nov 11, 2018 4:17 pm
- Forum: Bond Lengths & Energies
- Topic: Molar mass and attractive interactions
- Replies: 3
- Views: 431
Re: Molar mass and attractive interactions
If you are referring to the Van Der Waal forces, then molecules with higher molar masses will generally have higher surface areas, thus having higher values of Van Der Waal intermolecular forces.
- Sun Nov 11, 2018 4:01 pm
- Forum: Properties of Light
- Topic: Test 3
- Replies: 24
- Views: 2196
Re: Test 3
Test 3 starts in discussion the week after Thanksgiving break right? So Week 9?
- Sat Nov 03, 2018 1:14 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: degeneracy of the a 4p orbital
- Replies: 9
- Views: 2163
Re: degeneracy of the a 4p orbital
All three p orbitals in a given shell are degenerate because they all have the same energy level.
- Sat Nov 03, 2018 1:04 pm
- Forum: Lewis Structures
- Topic: Electron Affinity
- Replies: 2
- Views: 313
Re: Electron Affinity
When drawing Lewis Structures, the central atom is based on the element with the lowest ionization energy or electronegativity because both follow the same trend on the periodic table.
- Sat Nov 03, 2018 12:58 pm
- Forum: General Science Questions
- Topic: Schrodinger
- Replies: 2
- Views: 341
Re: Schrodinger
I don't think we will need to know Schrodinger's equation for the midterm since we weren't tested on it before.
- Sun Oct 28, 2018 8:21 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization Energy and Electron Affinity
- Replies: 9
- Views: 1869
Re: Ionization Energy and Electron Affinity
Ionization energy increases from left to right on the periodic table because of nuclear charge. The more protons there are in the nucleus, the stronger the attraction of the nucleus to the electrons.
- Sun Oct 28, 2018 8:08 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Affinity [ENDORSED]
- Replies: 7
- Views: 764
Re: Electron Affinity [ENDORSED]
What exactly is electron affinity? Is it the tendency for an atom to gain an electron, thus forming an negative ion (anion)? So the trend on the periodic table is essentially saying that electron affinity, or the tendency to form an anion, increases when you go from left to right and from bottom to ...
- Sat Oct 20, 2018 9:58 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Orbitals
- Replies: 4
- Views: 556
Re: Orbitals
Yeah I don't believe we have to draw the orbitals. I think as long as you understand what they are, then you will be fine for Test 2.
- Sat Oct 20, 2018 9:50 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Schrodinger's Wave Function
- Replies: 10
- Views: 994
Re: Schrodinger's Wave Function
What does Schrodinger's Wave Function tell you conceptually? Does it mathematically tell you how a wave function persists over time?
- Sat Oct 20, 2018 9:44 pm
- Forum: Student Social/Study Group
- Topic: Test #2
- Replies: 6
- Views: 479
Re: Test #2
I believe we have to know how to use all the formulas taught in class thus far, so it's plausible to say that we need to know Rydberg's formula for this test.
- Sun Oct 14, 2018 6:29 pm
- Forum: Properties of Light
- Topic: Wave vs. Particle Behavior
- Replies: 5
- Views: 514
Re: Wave vs. Particle Behavior
Electrons exemplify Wave-Particle Duality which is justified by the photoelectric effect and De Broglie's hypothesis regarding wavelength.
- Sun Oct 14, 2018 6:19 pm
- Forum: Properties of Electrons
- Topic: Photoelectric Experiment
- Replies: 9
- Views: 551
Re: Photoelectric Experiment
I think to increase the frequency of a light depends on the nature of the source and the Doppler Effect.
- Sun Oct 14, 2018 5:59 pm
- Forum: Einstein Equation
- Topic: Test #2
- Replies: 4
- Views: 436
Re: Test #2
Is the material covered on Test 2 just relating to the Quantum World?
- Sun Oct 07, 2018 4:33 pm
- Forum: Empirical & Molecular Formulas
- Topic: Molecular Formula
- Replies: 12
- Views: 599
Re: Molecular Formula
The molecular formula consists of the exact number of atoms for each element, whereas the empirical formula is the exact ratio of these atoms.
ex) molecular formula: H2O2 & empirical formula: HO (1:1 ratio)
ex) molecular formula: H2O2 & empirical formula: HO (1:1 ratio)
- Sun Oct 07, 2018 4:28 pm
- Forum: Significant Figures
- Topic: Rounding molar mass on the periodic table
- Replies: 3
- Views: 1778
Re: Rounding molar mass on the periodic table
I believe that the TAs are grading the exams are based on the least amount of sig figs stated in the problem. So it is safe to assume that you should use the given values of molar mass on the periodic table and then do the correct number of sig figs as your final answer.
- Sun Oct 07, 2018 4:21 pm
- Forum: Significant Figures
- Topic: All students read this sig fig post [ENDORSED]
- Replies: 170
- Views: 34547
Re: All students read this sig fig post [ENDORSED]
Can someone help me with a quick review of zeros in sig figs? I always get confused as to which zeros count as significant and which ones do not. 1. All non zero numbers are significant. ex) 613 has 3 sig figs 2. Zeros located between non-zero digits are significant ex) 5004 has 4 sig figs 3. Trail...