Search found 60 matches
- Tue Dec 03, 2019 11:25 am
- Forum: Amphoteric Compounds
- Topic: Amphoteric/acidic/basic
- Replies: 5
- Views: 404
Re: Amphoteric/acidic/basic
How do you know what is a metalloid based off of just looking at the periodic table?
- Tue Dec 03, 2019 11:24 am
- Forum: Properties & Structures of Inorganic & Organic Bases
- Topic: Which is the stronger acid?
- Replies: 9
- Views: 920
Re: Which is the stronger acid?
To answer this question, draw the structures of the resulting anion (conjugate base) and evaluate the stability. To draw the lewis structure of the anion, draw the original lewis structure and erase an H and put a negative. The stronger acid creates the more stable anion. HClO2 is stronger than HClO...
- Tue Dec 03, 2019 11:22 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentates
- Replies: 9
- Views: 657
Re: Polydentates
AnayaArnold_3L wrote:How would we identify ligands?
ligands are the things bonded to the metal. Ligands donate electrons to make a bond.
Examples would be F-, H2O
- Tue Dec 03, 2019 11:19 am
- Forum: Industrial Examples
- Topic: What do we need to know?
- Replies: 15
- Views: 1531
Re: What do we need to know?
He also went over transplatin in lecture, so I would know that too.
- Tue Dec 03, 2019 11:18 am
- Forum: Bond Lengths & Energies
- Topic: Boiling Point and bonds
- Replies: 5
- Views: 473
Re: Boiling Point and bonds
For LDFs, the higher molecular weight results in a higher boiling point (ie HI has a higher boiling point than HCl)
For dipole-dipole interactions, the greater difference in electronegativity has a higher boiling point
For dipole-dipole interactions, the greater difference in electronegativity has a higher boiling point
- Tue Dec 03, 2019 11:16 am
- Forum: Lewis Acids & Bases
- Topic: Memorizing Charges of Transition Metals
- Replies: 9
- Views: 789
Re: Memorizing Charges of Transition Metals
Can't the same metal have different oxidation states, though? Like Fe can be +2 or +3
- Sat Nov 30, 2019 1:53 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Worksheet for 1D/1F 10/16
- Replies: 24
- Views: 2018
Re: Worksheet for 1D/1F 10/16
for a-e on the 11/17 worksheet, what are the correct answers for the geometry and the hybridization?
- Tue Nov 26, 2019 6:13 pm
- Forum: Biological Examples
- Topic: cisplatin
- Replies: 3
- Views: 286
Re: cisplatin
What do we have to know about myoglobin and hemoglobin?
- Tue Nov 26, 2019 6:12 pm
- Forum: Student Social/Study Group
- Topic: Cyano vs. Cyanido
- Replies: 3
- Views: 349
Re: Cyano vs. Cyanido
I'm pretty sure you always say cyano.
- Tue Nov 26, 2019 6:11 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Length
- Replies: 22
- Views: 1222
Re: Bond Length
single bonds are longest and weakest, triple bonds are shortest and strongest
- Tue Nov 26, 2019 6:10 pm
- Forum: Bronsted Acids & Bases
- Topic: Difference
- Replies: 3
- Views: 192
Re: Difference
They are just different ways of explaining the same thing
- Tue Nov 26, 2019 6:08 pm
- Forum: Lewis Acids & Bases
- Topic: Identifying Lewis Acids and Bases
- Replies: 3
- Views: 203
Re: Identifying Lewis Acids and Bases
The compound with more H's is the acid, the compound with the least # of H's is the base!
- Tue Nov 19, 2019 11:23 am
- Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
- Topic: Gas Phase Question
- Replies: 5
- Views: 1153
Gas Phase Question
Even noble gasses, at very low temperatures, will condense to become liquids or freeze to become solid. At -200 degrees C, which is more likely to be a gas, Neon or Argon? Explain.
Could someone please provide the explanation for why Neon would be more likely to be a gas? Thank you!
Could someone please provide the explanation for why Neon would be more likely to be a gas? Thank you!
- Tue Nov 19, 2019 9:23 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: How to know which angles are smaller
- Replies: 8
- Views: 449
Re: How to know which angles are smaller
For seesaw, it would just be <90 and <120
for T-shaped, it would only be <90
for T-shaped, it would only be <90
- Tue Nov 19, 2019 9:22 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: States and Intermolecular forces
- Replies: 4
- Views: 275
Re: States and Intermolecular forces
Solids have the highest inter molecular forces and gasses have the lowest. Liquids are inbetween in IMF strength.
- Tue Nov 19, 2019 9:19 am
- Forum: Lewis Structures
- Topic: Octet Rule
- Replies: 7
- Views: 620
Re: Octet Rule
If you are breaking the octet rule, you still want the formal charge to be zero if possible!
- Tue Nov 19, 2019 9:18 am
- Forum: Dipole Moments
- Topic: Polar/Nonpolar Molecule Question
- Replies: 2
- Views: 181
Polar/Nonpolar Molecule Question
Is C2H5OC2H5 a polar or nonpolar molecule? How would you go about deciding this?
I think that it is polar because if we consider the central atom to be O, then all of the surrounding atoms are not the same.
Thanks in advance!
I think that it is polar because if we consider the central atom to be O, then all of the surrounding atoms are not the same.
Thanks in advance!
- Tue Nov 19, 2019 8:57 am
- Forum: Electronegativity
- Topic: H-bonding Question
- Replies: 2
- Views: 222
H-bonding Question
3F.1 Identify the types of attractive intermolecular interactions that might arise between molecules of each of the following substances: (a) NH2OH;(b) CBr4;(c) H2SeO4;(d) SO2. For C, H2SeO4, is the only reason that Hbonds are a valid answer because there is an O-H bond in the lewis structure AND an...
- Tue Nov 12, 2019 11:23 am
- Forum: Dipole Moments
- Topic: London forces
- Replies: 4
- Views: 246
Re: London forces
All molecules experience London dispersion forces as they all have a very tiny moment in time when their electrons move to one side of the atom and that side becomes slightly negative and the other side becomes slightly positive. It's just temporary attractions.
- Tue Nov 12, 2019 11:20 am
- Forum: Bond Lengths & Energies
- Topic: Vapor Pressure
- Replies: 1
- Views: 156
Vapor Pressure
What is the relationship between boiling point and vapor pressure?
- Tue Nov 12, 2019 11:19 am
- Forum: Bond Lengths & Energies
- Topic: Hw Problem 3F.19
- Replies: 1
- Views: 182
Hw Problem 3F.19
Could someone walk me through this problem?
3F.19 Account for the following observations in terms of the type and strength of intermolecular forces. (a) The melting point of solid xenon is
−112°C and that of solid argon is −189°C
Thanks in advance!
3F.19 Account for the following observations in terms of the type and strength of intermolecular forces. (a) The melting point of solid xenon is
−112°C and that of solid argon is −189°C
Thanks in advance!
- Tue Nov 12, 2019 11:14 am
- Forum: Dipole Moments
- Topic: Melting Point Due to Anion Size
- Replies: 1
- Views: 125
Melting Point Due to Anion Size
In HW Problem 3F.5 C, we are asked to determine whether CHI3 or CHF3 has a higher melting point. The answer is that CHI3 has the higher melting point because Iodine has a larger atomic radius and more electrons than F. In 2D, we learned that a C-F bond is more ionic than a C-I bond since longer bond...
- Tue Nov 12, 2019 11:10 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Homework for Week 7
- Replies: 5
- Views: 276
Re: Homework for Week 7
I think the regular 3F and the focus 3F problems are a safe bet!
- Tue Nov 05, 2019 9:57 pm
- Forum: Electronegativity
- Topic: Electronegativity Chart
- Replies: 5
- Views: 480
Electronegativity Chart
Does anyone know if we will be given a chart with the exact electronegativity values for atoms? Or should we have a general idea based on just looking at the atom's position on the periodic table?
- Tue Nov 05, 2019 9:54 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Quantum Numbers Question
- Replies: 4
- Views: 482
Quantum Numbers Question
Q: What is the maximum number of electrons that can occupy the orbitals with principle quantum number = 4?
A: 32
Can someone please explain why the answer is 32? Thanks!
A: 32
Can someone please explain why the answer is 32? Thanks!
- Tue Nov 05, 2019 9:51 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Determining which bonds are more polar
- Replies: 4
- Views: 227
Determining which bonds are more polar
If you are comparing Mg-O and B-O, would Mg-O be more polar because Mg has a smaller radius than B?
Thanks in advance!
Thanks in advance!
- Tue Nov 05, 2019 9:49 pm
- Forum: Lewis Structures
- Topic: Exceptions to the Octet Rule Question
- Replies: 5
- Views: 584
Exceptions to the Octet Rule Question
Are there any other exceptions besides P, S, Cl, and the first 4 elements of the periodic table?
Thanks in advance!
Thanks in advance!
- Tue Nov 05, 2019 9:48 pm
- Forum: Resonance Structures
- Topic: Formal Charge Question
- Replies: 16
- Views: 812
Formal Charge Question
In order for two resonance structures to be valid, do they have to have the same formal charges on all their atoms? Or do they have to sum up to have the same overall charge?
Thanks in advance!
Thanks in advance!
- Sun Nov 03, 2019 10:18 am
- Forum: Administrative Questions and Class Announcements
- Topic: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]
- Replies: 52
- Views: 6534
Re: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]
Ada Chung 1C wrote:Will the mini dino nuggets answer key be posted as well?
Whoever posts the answers, could you please include the lewis structure drawings for 2A with the dipole moments included?
Does anyone know when to draw the dipole moments and which atoms to put them on?
- Tue Oct 29, 2019 4:05 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Do Midterm Review Sessions Repeat Topics?
- Replies: 4
- Views: 169
Do Midterm Review Sessions Repeat Topics?
If I am unable to attend the Early Quantum review tonight, will there be another midterm review session covering this topic?
Thanks in advance!
Thanks in advance!
- Tue Oct 29, 2019 4:01 pm
- Forum: Octet Exceptions
- Topic: Exceptions to the Octet Rule Question
- Replies: 3
- Views: 150
Exceptions to the Octet Rule Question
Do P, S, and Cl ALWAYS have to defy the octet rule? Is it only if they are the center atom in the lewis dot structure?
Thanks in advance!
Thanks in advance!
- Tue Oct 29, 2019 3:57 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charges on Atoms Summed in Ions?
- Replies: 6
- Views: 190
Formal Charges on Atoms Summed in Ions?
If you have an ion with one atom having a +1 formal charge and another atom having a -1 formal charge, do these charges cancel each other out if there are only two atoms in the ion?
Thanks in advance!
Thanks in advance!
- Tue Oct 29, 2019 3:55 pm
- Forum: Lewis Structures
- Topic: Chemistry Terminology for Electron and Lone Pairs
- Replies: 1
- Views: 84
Chemistry Terminology for Electron and Lone Pairs
When a problem asks for numbers of electron pairs (both bonding and lone pairs), are the asking for actual pairs or the individual dot numbers?
Ie would four lone electrons (individual dots) be considered 2 electron lone pairs?
Thanks in advance!
Ie would four lone electrons (individual dots) be considered 2 electron lone pairs?
Thanks in advance!
- Tue Oct 29, 2019 3:52 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 5 HW
- Replies: 4
- Views: 312
Re: Week 5 HW
I'm pretty sure the homework corresponds to the content we are learning this week. I think only Chemical Bonds Hw is accepted. Please correct me if I'm wrong.
- Fri Oct 25, 2019 9:21 am
- Forum: DeBroglie Equation
- Topic: Exercise 1.39 [ENDORSED]
- Replies: 4
- Views: 1799
Re: Exercise 1.39 [ENDORSED]
Michelle Nwufo 2G wrote:So, mass is always represented in kilograms and velocity in meters per second?
I believe this only holds true for the De Broglie Equation
wavelength in meters,
h in Js,
mass in kg
velocity in m/s
Please correct me if I am wrong.
- Wed Oct 23, 2019 8:42 pm
- Forum: Photoelectric Effect
- Topic: Hw Help 1B.15
- Replies: 2
- Views: 136
Hw Help 1B.15
The velocity of an electron that is emitted from a metallic surface by a photon is . (a) What is the wavelength of the ejected electron? (b) No electrons are emitted from the surface of the metal until the frequency of the radiation reaches . How much energy is required to remove the electron from t...
- Wed Oct 23, 2019 7:13 pm
- Forum: Photoelectric Effect
- Topic: Hw Help 1B.5
- Replies: 1
- Views: 77
Hw Help 1B.5
From the following list of observations, select the one that best supports the idea that electromagnetic radiation has the properties of particles. Explain your reasoning. (a) Black-body radiation. (b) Electron diffraction. (c) Atomic spectra. (d) The photoelectric effect. I understand that D is the...
- Wed Oct 23, 2019 4:27 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Hw Help 1A.11
- Replies: 2
- Views: 158
Hw Help 1A.11
In the spectrum of atomic hydrogen, several lines are generally classified together as belonging to a series (for example, Balmer series or Lyman series, as shown in Fig. 1A.10). What is common to the lines within a series that makes grouping them together logical? Could someone please explain this ...
- Tue Oct 22, 2019 4:07 pm
- Forum: Trends in The Periodic Table
- Topic: Hw Help 1F.22
- Replies: 2
- Views: 241
Hw Help 1F.22
Identify the following elements as metals, nonmetals, or metalloids: (a) aluminum; (b) carbon; (c) germanium; (d) arsenic; (e) selenium; (f) tellurium.
How can you say for sure?
How can you say for sure?
- Tue Oct 22, 2019 3:14 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Hw Help 1D.25
- Replies: 3
- Views: 126
Hw Help 1D.25
Which of the following subshells CANNOT exist in an atom:
(a) 2d
(b) 4d
(c) 4g
(d) 6f
How do I go about solving this problem? Thanks in advance!
(a) 2d
(b) 4d
(c) 4g
(d) 6f
How do I go about solving this problem? Thanks in advance!
- Tue Oct 15, 2019 4:10 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Atomic Spectra Wave Model or Particle Model?
- Replies: 1
- Views: 71
Atomic Spectra Wave Model or Particle Model?
According to Atomic Spectra, are electrons acting more as a wave or a particle? Please explain.
- Tue Oct 15, 2019 4:10 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Atomic Spectra Wave Model or Particle Model?
- Replies: 3
- Views: 99
Atomic Spectra Wave Model or Particle Model?
According to Atomic Spectra, are electrons acting more as a wave or a particle? Please explain.
- Tue Oct 15, 2019 4:10 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Atomic Spectra Wave Model or Particle Model?
- Replies: 2
- Views: 225
Atomic Spectra Wave Model or Particle Model?
According to Atomic Spectra, are electrons acting more as a wave or a particle? Please explain.
- Tue Oct 15, 2019 4:09 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg equation [ENDORSED]
- Replies: 73
- Views: 8680
Re: Rydberg equation [ENDORSED]
Will we ever have to square root n to find the value for an energy state?
- Tue Oct 15, 2019 4:06 pm
- Forum: Administrative Questions and Class Announcements
- Topic: How do I post a new topic?
- Replies: 2
- Views: 17033
How do I post a new topic?
If my topic is relating to Rydberg, can I create a new topic that is not listed under the board index for Quantum World? Where would be the most appropriate place to post something like this?
- Tue Oct 15, 2019 3:44 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: 1B.27 Hw Help
- Replies: 5
- Views: 154
1B.27 Hw Help
A bowling ball of mass 8.00 kg is rolled down a bowling alley lane at . What is the minimum uncertainty in its position?
How do you solve for the change in velocity here? It seems as though we are not given enough information.
How do you solve for the change in velocity here? It seems as though we are not given enough information.
- Tue Oct 15, 2019 3:09 pm
- Forum: Properties of Light
- Topic: 1A. 15 HW Problem
- Replies: 2
- Views: 85
1A. 15 HW Problem
In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral line. What does 102.6 nm tell you here? I know uv light is n=1, but what am I mi...
- Sun Oct 13, 2019 3:12 pm
- Forum: SI Units, Unit Conversions
- Topic: knowing how many sig figs to use
- Replies: 17
- Views: 762
Re: knowing how many sig figs to use
Does anyone know how much sig fig answers are worth in the context of tests and exams? How many points will be deducted if sig figs are used incorrectly?
- Thu Oct 10, 2019 6:46 pm
- Forum: Properties of Light
- Topic: hw problem 1.A.15
- Replies: 3
- Views: 248
hw problem 1.A.15
In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral line.
Could someone please walk me through the math here? Thanks!
Could someone please walk me through the math here? Thanks!
- Thu Oct 10, 2019 4:57 pm
- Forum: Properties of Light
- Topic: 1.A.3 Hw Help
- Replies: 3
- Views: 113
1.A.3 Hw Help
Which of the following happens when the frequency of electromagnetic radiation decreases? Explain your reasoning. (a) The speed of the radiation decreases. (b) The wavelength of the radiation decreases. (c) The extent of the change in the electrical field at a given point decreases. (d) The energy o...
- Thu Oct 10, 2019 4:52 pm
- Forum: Administrative Questions and Class Announcements
- Topic: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE
- Replies: 53
- Views: 5727
Re: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE
Will you be posting the worksheets and their answer keys weekly?
Thank you so much for making these!
Thank you so much for making these!
- Wed Oct 09, 2019 11:36 am
- Forum: SI Units, Unit Conversions
- Topic: Sig Fig Help! [ENDORSED]
- Replies: 6
- Views: 444
Sig Fig Help! [ENDORSED]
Do 1.0003 and 0.0003 have the same number of sig figs? Could someone please clarify this? Thanks!
- Tue Oct 08, 2019 10:17 pm
- Forum: SI Units, Unit Conversions
- Topic: Accuracy vs Precision
- Replies: 11
- Views: 739
Accuracy vs Precision
Hi there!
Could someone clarify the difference between accuracy and precision?
Could someone clarify the difference between accuracy and precision?
- Tue Oct 08, 2019 12:51 pm
- Forum: SI Units, Unit Conversions
- Topic: Polyatomic Ions
- Replies: 2
- Views: 225
Polyatomic Ions
Are we expected to memorize polyatomic ions and their charges for Test 1? If so, which ones?
- Sat Oct 05, 2019 5:32 pm
- Forum: SI Units, Unit Conversions
- Topic: When is Test #1?
- Replies: 9
- Views: 476
When is Test #1?
I tried looking through the syllabus, but I don't see a calendar. Does anyone know when/where Test #1 is? What topics will it cover?
- Wed Oct 02, 2019 2:18 pm
- Forum: Student Social/Study Group
- Topic: Study Group Fall 2019
- Replies: 32
- Views: 2721
Re: Study Group Fall 2019
I am interested in joining, as well! YRL also has really great study rooms :)
- Tue Oct 01, 2019 11:22 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Solving for Volume G.5 a)
- Replies: 8
- Views: 535
Re: Solving for Volume G.5 a)
So this problem is asking us to determine the volume of the solution should be transferred into a flask in order to obtain 2.15 mmol of Na+ . Importantly, this is not a dilution problem. Therefore, we won't be using the M1V1=M2V2 equation. The molarity of the solution won't be changing when we tran...
- Tue Oct 01, 2019 6:53 pm
- Forum: SI Units, Unit Conversions
- Topic: Can someone tell me where I can access the Solutions Manual?
- Replies: 6
- Views: 412
Can someone tell me where I can access the Solutions Manual?
So I purchased the textbook bundle that Dr. Lavelle recommended, I'm just not sure where I can find the solutions manual??
Thanks in advance!
Thanks in advance!
- Tue Oct 01, 2019 2:54 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Video Module Practice Problem Help
- Replies: 2
- Views: 191
Video Module Practice Problem Help
Could someone please explain how to do the following problem? 5.00 g of KMnO4 is dissolved in a 150.00 mL flask of water. If 20.00 mL of this solution is removed and placed in a new 2nd 250.00 mL flask and filled with water, what is the concentration of the solution in the 2nd flask? Molar Masses: K...
- Tue Oct 01, 2019 2:20 pm
- Forum: Significant Figures
- Topic: Could someone please clarify about Sig Figs?
- Replies: 4
- Views: 140
Could someone please clarify about Sig Figs?
When is 0 considered a significant figure and when is it not?
When do you round up or down if the number ends in 5?
Thanks in advance :)
When do you round up or down if the number ends in 5?
Thanks in advance :)