Search found 31 matches

by Estelle Jung
Sun Dec 09, 2018 10:21 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Grade View
Replies: 7
Views: 179

Re: Final Grade View

I think we get our final results one or two weeks after the final exam.
by Estelle Jung
Sun Dec 09, 2018 10:18 pm
Forum: Biological Examples
Topic: Cisplatin
Replies: 7
Views: 88

Re: Cisplatin

Cisplatin is used in chemotherapy and can be used to treat cancer.
by Estelle Jung
Sun Dec 09, 2018 10:15 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: AX3E
Replies: 18
Views: 122

Re: AX3E

It would be trigonal pyramidal because of the extra lone pair.
by Estelle Jung
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: 26

Re: Hydrogen Bonding

Yes, because a dipole moment exists in hydrogen bonding, the molecule is considered to be polar.
by Estelle Jung
Sun Dec 02, 2018 6:45 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: 4.73
Replies: 2
Views: 33

Re: 4.73

Usually radicals have an odd number an electrons because they have at least one unpaired electron.
by Estelle Jung
Sun Dec 02, 2018 6:44 pm
Forum: Amphoteric Compounds
Topic: Examples
Replies: 6
Views: 44

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.
by Estelle Jung
Sun Nov 25, 2018 7:47 pm
Forum: Octet Exceptions
Topic: Radicals
Replies: 16
Views: 180

Re: Radicals

Molecules usually with an odd number of electrons will be considered a radical.
by Estelle Jung
Sun Nov 25, 2018 7:43 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Exam
Replies: 22
Views: 291

Re: Final Exam

I believe that the final will most likely be cumulative.
by Estelle Jung
Sun Nov 25, 2018 7:36 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 3 material
Replies: 6
Views: 65

Re: Test 3 material

I believe Test 3 covers polarity, VSEPR models, and molecular geometry.
by Estelle Jung
Sun Nov 18, 2018 7:30 pm
Forum: Bond Lengths & Energies
Topic: Lengths of different types of bonds
Replies: 3
Views: 49

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.
by Estelle Jung
Sun Nov 18, 2018 7:04 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining Shape
Replies: 10
Views: 128

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.
by Estelle Jung
Sun Nov 18, 2018 6:44 pm
Forum: Administrative Questions and Class Announcements
Topic: Thanksgiving week
Replies: 10
Views: 189

Re: Thanksgiving week

Are we able to turn in our homework for Week 8 when we come back from break (Week 9)?
by Estelle Jung
Sun Nov 11, 2018 4:27 pm
Forum: Ionic & Covalent Bonds
Topic: Van der Waals vs Dispersion Forces
Replies: 8
Views: 70

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.
by Estelle Jung
Sun Nov 11, 2018 4:25 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: molecular shapes
Replies: 13
Views: 131

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
by Estelle Jung
Sun Nov 11, 2018 4:19 pm
Forum: Properties of Light
Topic: Test 3
Replies: 24
Views: 339

Re: Test 3

@MichaelNirula Okay thanks!
by Estelle Jung
Sun Nov 11, 2018 4:17 pm
Forum: Bond Lengths & Energies
Topic: Molar mass and attractive interactions
Replies: 3
Views: 21

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.
by Estelle Jung
Sun Nov 11, 2018 4:01 pm
Forum: Properties of Light
Topic: Test 3
Replies: 24
Views: 339

Re: Test 3

Test 3 starts in discussion the week after Thanksgiving break right? So Week 9?
by Estelle Jung
Sat Nov 03, 2018 1:14 pm
Forum: Quantum Numbers and The H-Atom
Topic: degeneracy of the a 4p orbital
Replies: 9
Views: 180

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.
by Estelle Jung
Sat Nov 03, 2018 1:04 pm
Forum: Lewis Structures
Topic: Electron Affinity
Replies: 2
Views: 21

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.
by Estelle Jung
Sat Nov 03, 2018 12:58 pm
Forum: General Science Questions
Topic: Schrodinger
Replies: 2
Views: 58

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.
by Estelle Jung
Sun Oct 28, 2018 8:21 pm
Forum: Trends in The Periodic Table
Topic: Ionization Energy and Electron Affinity
Replies: 9
Views: 218

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.
by Estelle Jung
Sun Oct 28, 2018 8:08 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Affinity [ENDORSED]
Replies: 7
Views: 122

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 ...
by Estelle Jung
Sat Oct 20, 2018 9:58 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals
Replies: 4
Views: 121

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.
by Estelle Jung
Sat Oct 20, 2018 9:50 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Schrodinger's Wave Function
Replies: 10
Views: 119

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?
by Estelle Jung
Sat Oct 20, 2018 9:44 pm
Forum: Student Social/Study Group
Topic: Test #2
Replies: 6
Views: 74

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.
by Estelle Jung
Sun Oct 14, 2018 6:29 pm
Forum: Properties of Light
Topic: Wave vs. Particle Behavior
Replies: 5
Views: 51

Re: Wave vs. Particle Behavior

Electrons exemplify Wave-Particle Duality which is justified by the photoelectric effect and De Broglie's hypothesis regarding wavelength.
by Estelle Jung
Sun Oct 14, 2018 6:19 pm
Forum: Properties of Electrons
Topic: Photoelectric Experiment
Replies: 9
Views: 70

Re: Photoelectric Experiment

I think to increase the frequency of a light depends on the nature of the source and the Doppler Effect.
by Estelle Jung
Sun Oct 14, 2018 5:59 pm
Forum: Einstein Equation
Topic: Test #2
Replies: 4
Views: 94

Re: Test #2

Is the material covered on Test 2 just relating to the Quantum World?
by Estelle Jung
Sun Oct 07, 2018 4:33 pm
Forum: Empirical & Molecular Formulas
Topic: Molecular Formula
Replies: 12
Views: 99

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)
by Estelle Jung
Sun Oct 07, 2018 4:28 pm
Forum: Significant Figures
Topic: Rounding molar mass on the periodic table
Replies: 3
Views: 35

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.
by Estelle Jung
Sun Oct 07, 2018 4:21 pm
Forum: Significant Figures
Topic: All students read this sig fig post [ENDORSED]
Replies: 90
Views: 7720

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...

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