Search found 58 matches
Re: Cisplatin
This is because Guanine has Nitrogens with lone pairs that bond with the Cl atoms in cisplatin.
- Sun Dec 08, 2019 7:32 pm
- Forum: Bronsted Acids & Bases
- Topic: NH3
- Replies: 5
- Views: 1142
Re: NH3
NH3 is amphiprotic, meaning it can act as a base or an acid, so you have to look at the reaction!
- Sun Dec 08, 2019 7:30 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Ph and poH of weak acids
- Replies: 8
- Views: 405
Re: Ph and poH of weak acids
We learn to calculate this in 14B!
- Sun Dec 08, 2019 7:29 pm
- Forum: Hybridization
- Topic: 2sp2 and sp2
- Replies: 10
- Views: 803
Re: 2sp2 and sp2
You should specify 2sp2 only if the orbital is asked!
Re: -ate
No, ate is only added to an anion!
- Wed Dec 04, 2019 11:22 pm
- Forum: Lewis Acids & Bases
- Topic: Acid Names
- Replies: 1
- Views: 175
Acid Names
Are there any acids that we should memorize and be able to name if used in a question?
Ligands
Do we have to memorize the common ligands chart in section 9C.1 of the textbook?
- Mon Dec 02, 2019 5:03 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final tips
- Replies: 19
- Views: 1002
Re: Final tips
I would definitely take advantage of the review material and session provided by the Undergraduate and Teaching assistants!
- Mon Dec 02, 2019 4:56 pm
- Forum: Calculating the pH of Salt Solutions
- Topic: Change in pH of a solution
- Replies: 2
- Views: 176
Re: Change in pH of a solution
This is because depending on the molecule, conjugates of it may affect the concentration of hydroxide and hydronium ions, which affects the pH.
- Mon Dec 02, 2019 4:34 pm
- Forum: Hybridization
- Topic: Lone Pairs
- Replies: 2
- Views: 164
Re: Lone Pairs
Yes it does work, you just have to account for lone pairs when determining hybridization.
- Mon Dec 02, 2019 4:33 pm
- Forum: Bond Lengths & Energies
- Topic: Boiling point
- Replies: 11
- Views: 1151
Re: Boiling point
The greater the molar mass, the higher the boiling point.
- Mon Dec 02, 2019 4:33 pm
- Forum: Electronegativity
- Topic: Atom size
- Replies: 22
- Views: 3159
Re: Atom size
Electronegativity and atomic size have opposite trends.
- Sat Nov 23, 2019 8:26 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: Problem 3F10 b
- Replies: 6
- Views: 416
Re: Problem 3F10 b
Si2F2 has stronger intermolecular forces because it is more polar. SiF4 is non polar.
- Sat Nov 23, 2019 8:23 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPER shape for IF4-
- Replies: 5
- Views: 1766
Re: VSEPER shape for IF4-
It would be square planar.
- Sat Nov 23, 2019 8:19 pm
- Forum: Resonance Structures
- Topic: Resonance and Naming
- Replies: 11
- Views: 841
Re: Resonance and Naming
No, resonance just refers to variations in writing the structures.
- Sat Nov 23, 2019 8:17 pm
- Forum: Sigma & Pi Bonds
- Topic: How to Find Sigma Bonds and Pi Bonds
- Replies: 15
- Views: 1165
Re: How to Find Sigma Bonds and Pi Bonds
A single bond has a sigma bond, a double bond has one sigma bond and one pi bond, a triple bond has one sigma bond and two pi bonds.
- Sat Nov 23, 2019 8:13 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Seesaw
- Replies: 23
- Views: 934
Re: Seesaw
Yes, it should be less than 90 and 120.
- Sat Nov 16, 2019 8:37 pm
- Forum: Hybridization
- Topic: test 2
- Replies: 8
- Views: 453
test 2
is hybridization and sigma/pi bonds going to be on test 2?
- Thu Nov 14, 2019 3:47 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: HW 2.63
- Replies: 2
- Views: 198
Re: HW 2.63
Ziyan Wang 3J wrote:In order to fulfill octet rule, there must be two lone pairs of electron around O (since bonding pairs only account for four electrons), thus O have 4 electron domains and its bonding angle is 109.5 (similar to tetrahedral).
that makes sense, thank u!
- Thu Nov 14, 2019 3:00 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: format of test
- Replies: 5
- Views: 245
format of test
Does anyone know what the format of Test 2 will be?
- Thu Nov 14, 2019 2:57 pm
- Forum: Bond Lengths & Energies
- Topic: Electron Density
- Replies: 10
- Views: 613
Re: Electron Density
Yes they are considered regions of electron density
- Thu Nov 14, 2019 2:54 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 2E.11
- Replies: 4
- Views: 756
Re: 2E.11
This is because although IF4- has 6 areas of electron density, you only look at bonded electrons when determining molecular shape. It has 4 bonds with 2 lone pairs, which gives it an octahedral electron arrangement but a square planar molecular geometry.
- Thu Nov 14, 2019 2:45 pm
- Forum: Hybridization
- Topic: 2F.5
- Replies: 4
- Views: 292
Re: 2F.5
To find the hybridization, count up how many bonds and lone pairs the atom has. If it is 3, then the hybridization would be sp2. If it is 4, then the hybridization would be sp3, and so on. For BeCl2, Be is the central atom and has 2 bonds and no lone pairs, so its hybridization would be sp.
- Thu Nov 14, 2019 2:41 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: HW 2.63
- Replies: 2
- Views: 198
HW 2.63
For homework problem 2.63, why is the bond angle for arc b 109.5 degrees?
- Wed Nov 13, 2019 7:07 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polar vs. Nonpolar
- Replies: 12
- Views: 742
Polar vs. Nonpolar
Can someone explain how to determine if a molecule is polar or non polar by looking at its molecular geometry/shape?
- Wed Nov 13, 2019 4:47 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Exam 2
- Replies: 3
- Views: 165
Exam 2
What are all the topics included on Exam 2?
- Sun Nov 10, 2019 3:48 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 2
- Replies: 7
- Views: 428
Re: Test 2
Does anyone know which week Test 2 will be?
- Sun Nov 10, 2019 3:47 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge Equation?
- Replies: 12
- Views: 497
Re: Formal Charge Equation?
In the first equation, B is counted as a bond, while in the second equations B is counted as each shared electron. That's why when counted as singular electrons, it has to be divided by 2 to account for the bonds.
- Sun Nov 10, 2019 3:44 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Magnetic Quantum numbers
- Replies: 13
- Views: 752
Re: Magnetic Quantum numbers
To determine magnetic quantum number (ml), you must look at the angular momentum number (l). ml can be any value from -l to +l. For example, if l=2, then ml=-2, -1, 0, 1, 2. If l=0, then ml has one possible value, = 0.
- Sun Nov 10, 2019 2:22 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizability
- Replies: 3
- Views: 132
Polarizability
Can anyone explain the periodic trend for polarizability and the trend for polarizing power?
- Sun Nov 10, 2019 2:12 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizability
- Replies: 4
- Views: 306
Polarizability
Can anyone explain the periodic trend for polarizability and the trend for polarizing power?
- Sun Nov 10, 2019 2:10 pm
- Forum: Dipole Moments
- Topic: Dipole moments
- Replies: 6
- Views: 307
Dipole moments
How exactly does a dipole moment occur? and how is it induced?
- Sun Nov 03, 2019 11:07 pm
- Forum: *Shrodinger Equation
- Topic: effective nuclear charge
- Replies: 6
- Views: 655
effective nuclear charge
Can someone explain what effective nuclear charge means?
- Sun Nov 03, 2019 11:04 pm
- Forum: Properties of Light
- Topic: What are the units of hertz
- Replies: 41
- Views: 1946
Re: What are the units of hertz
1 cycle/second!
- Sun Nov 03, 2019 10:46 pm
- Forum: General Science Questions
- Topic: Step Up Sessions
- Replies: 3
- Views: 117
Re: Step Up Sessions
Does anyone know when/where the step up sessions are for this Monday and Tuesday?
- Sun Nov 03, 2019 10:45 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterms
- Replies: 6
- Views: 407
Re: Midterms
Yes! We have one more test and then our final.
- Sun Nov 03, 2019 10:34 pm
- Forum: Lewis Structures
- Topic: Octet Rule
- Replies: 6
- Views: 357
Re: Octet Rule
The octet rule basically means an atom must have 8 electrons in their valence shells and will bond in arrangements that allow for that. But there can be exceptions to the octet rule, such as CH3 and BF3 where the atom in the center doesn't have a full valence shell.
- Sun Nov 03, 2019 10:27 pm
- Forum: Lewis Structures
- Topic: Resonance
- Replies: 5
- Views: 220
Re: Resonance
You can figure out if resonance occurs when you draw out the Lewis structure. For example for a nitrate ion (NO3-), an NO double bond is required for all 4 atoms to have an octet. Because there are 3 oxygen atoms, the double bond can be drawn on any one of them, resulting in 3 possible structures.
- Sun Oct 27, 2019 10:51 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm Format
- Replies: 11
- Views: 457
Re: Midterm Format
I know it's still weeks away but I was wondering, does anyone know about the format of the midterm? Is it comparable to Test 1 but just longer in length? What types of questions will be on it and which units does it cover? Where is the midterm located? Will that be announced closer to the midterm d...
- Sun Oct 27, 2019 10:42 pm
- Forum: Resonance Structures
- Topic: Midterm
- Replies: 4
- Views: 130
Midterm
Does anyone know what all the topics for the Midterm include?
- Sun Oct 27, 2019 10:37 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Advice for studying
- Replies: 92
- Views: 6501
Re: Advice for studying
Aside from the textbook problems and online video modules, I would recommend doing to the Step-Up sessions and the upcoming midterm review sessions if you feel that you study well with others around; it would be a good way to clarify and reinforce concepts.
- Sun Oct 27, 2019 10:34 pm
- Forum: *Particle in a Box
- Topic: TEST 2
- Replies: 14
- Views: 1285
Re: TEST 2
Test 2 is during week 8 on whichever day you have discussion! As for studying, I think the best is way to go over what the syllabus states in the textbook but go through the video modules and notes from lectures to reinforce all the material.
- Sun Oct 27, 2019 1:58 pm
- Forum: Properties of Light
- Topic: Value for C
- Replies: 8
- Views: 248
Value for C
What value is recommended we use for the c constant during calculations? 2.998e8 or 3.00e8?
- Sun Oct 20, 2019 9:52 pm
- Forum: Properties of Light
- Topic: What are the units of hertz
- Replies: 41
- Views: 1946
Re: What are the units of hertz
I cycle per second
- Sun Oct 20, 2019 9:50 pm
- Forum: DeBroglie Equation
- Topic: Unit Conversion
- Replies: 5
- Views: 168
Re: Unit Conversion
I MHz is equivalent to 10^6 Hz, so using that conversion you should be able to go from MHz to Hz and vice versa.
- Sun Oct 20, 2019 9:43 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Paired & Parallel Electrons
- Replies: 4
- Views: 150
Re: Paired & Parallel Electrons
Parallel electrons have the same spin state, meaning they both go up or both go down. Paired electrons, on the other hand, have opposite spin states, meaning one goes up and one goes down.
- Sun Oct 20, 2019 9:42 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron configurations of ions
- Replies: 4
- Views: 152
Re: Electron configurations of ions
A negative charge on an ion indicates that it gained electrons, while a positive charge indicates that the ion lost electrons.
- Sun Oct 20, 2019 9:35 pm
- Forum: Properties of Light
- Topic: N levels
- Replies: 8
- Views: 450
Re: N levels
The N value signifies the energy level of an electron, and is called the Principle Quantum Number. The n value increase basically when an electron is excited and increases in energy level.The n value decreases when an electron emits energy and decreases in energy level.
- Sun Oct 13, 2019 5:21 pm
- Forum: Significant Figures
- Topic: Sig Figs at the Beginning or End
- Replies: 14
- Views: 4694
Re: Sig Figs at the Beginning or End
If the problem requires many calculations and steps, I would end each step with more significant figures than necessary just to avoid any error. At the very end, round your final answer to how many ever significant figures are necessary. I think this is crucial because even rounding slightly up or d...
- Sun Oct 13, 2019 5:12 pm
- Forum: Significant Figures
- Topic: When to apply Sig Figs
- Replies: 6
- Views: 340
Re: When to apply Sig Figs
I don't apply sig figs in between steps or calculations just to avoid error that could come from rounding prematurely.
- Sun Oct 13, 2019 5:10 pm
- Forum: Significant Figures
- Topic: How Many Sig Figs
- Replies: 7
- Views: 397
Re: How Many Sig Figs
If that is the case, I would use decimal places to figure out rounding. Or, if you need to use the periodic table, use the sig figs of the molar masses to figure out the final sig fig value.
- Sun Oct 13, 2019 5:02 pm
- Forum: SI Units, Unit Conversions
- Topic: Unit conversion
- Replies: 15
- Views: 1500
Re: Unit conversion
The conversion for Angstroms is 1 A = 10^-10 meters. Using this base conversion, you can convert to whatever desired unit.
- Sun Oct 13, 2019 5:00 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Best Way To Study?
- Replies: 56
- Views: 3354
Re: Best Way To Study?
For me, reading the textbook definitely helps clarify the concepts that Professor Lavelle goes over in class. The practice problems are also great review and pretty much solidify the material.
- Sun Oct 06, 2019 7:39 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 1
- Replies: 3
- Views: 234
Re: Test 1
I believe Test 1 covers the Review of Chemical & Physical Principles. So that would be all the Fundamentals sections in the textbook.
- Sun Oct 06, 2019 7:35 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Molar Mass
- Replies: 4
- Views: 167
Re: Molar Mass
You won't have to memorize the molar masses from the periodic table but if the molar mass of a compound or element isn't given in the problem, you should be able to use the periodic table in order to calculate its molar mass. Usually, the molar mass is given and calculated with 4 significant figures.
- Sun Oct 06, 2019 7:29 pm
- Forum: Empirical & Molecular Formulas
- Topic: Rounding vs. Multiplying
- Replies: 4
- Views: 262
Re: Rounding vs. Multiplying
I would multiply to find another ratio if the decimal is more than .2 away from a whole number. So if I you had 1.1, I would just round down to 1.
- Sun Oct 06, 2019 7:25 pm
- Forum: Empirical & Molecular Formulas
- Topic: E15 Homework Problem
- Replies: 3
- Views: 379
E15 Homework Problem
" The molar mass of the metal hydroxide M(OH)2 is 74.10 g*mol^-1. What is the molar mass of the chloride of this metal? "
How would you go about this problem?
How would you go about this problem?
- Sun Oct 06, 2019 7:19 pm
- Forum: Properties of Light
- Topic: c = fλ
- Replies: 9
- Views: 488
Re: c = fλ
Yes, the c is a constant and will always equal 3.00 X 10^8. The frequency and wavelength vary inversely so their product will always equal the constant c.