Search found 52 matches
- Sun Dec 08, 2019 9:16 pm
- Forum: Conjugate Acids & Bases
- Topic: Acid/base reactions
- Replies: 3
- Views: 309
Re: Acid/base reactions
And remember that Lewis Acids/Bases are always Bronsted Acids/Bases but not the other way around.
- Sun Dec 01, 2019 5:31 pm
- Forum: Bronsted Acids & Bases
- Topic: How to tell
- Replies: 4
- Views: 280
How to tell
How do you tell if a compound is a bronsted acid or a bronsted base? For example NH3?
- Sun Dec 01, 2019 4:49 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Homework problem 9C #9d
- Replies: 1
- Views: 139
Homework problem 9C #9d
How do you know that in 9d, edta is hexadentate?
- Sun Dec 01, 2019 2:23 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: What is kA value?
- Replies: 5
- Views: 540
What is kA value?
What exactly does kA mean? I know its the equilibrium value, but when you calculate it, do you say that it is the amount of acid dissociated?
- Sun Dec 01, 2019 2:17 pm
- Forum: Lewis Acids & Bases
- Topic: Lewis Acids
- Replies: 3
- Views: 227
Lewis Acids
I'm a little confused about this. In my notes I wrote that a species that accepts an electron pair is a lewis acid, but if it accepts an electron, doesn't it get more negative, or basic? Wouldn't a lewis acid be a species that accepts an H+?
- Sun Dec 01, 2019 2:13 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentates
- Replies: 1
- Views: 146
Polydentates
What's the significance of polydentates? Do ligands want to bind at multiple sites, or is there no correlation between that? Also, how do chelating ligands bind cations tightly?
- Sun Dec 01, 2019 2:08 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination Compounds Creation
- Replies: 1
- Views: 141
Coordination Compounds Creation
How exactly do you make a coordination compound?
- Sun Dec 01, 2019 2:04 pm
- Forum: Biological Examples
- Topic: Coordination Compounds and Chemotherapy Drugs
- Replies: 5
- Views: 359
Re: Coordination Compounds and Chemotherapy Drugs
In lecture, Lavelle said that cisplatin forms a coordination compound with DNA (Pt bonds with N in NH3) and this stops cell division (replication inhibition, transportation inhibition, cell cycle arrest, dna repair, and cell death).
- Tue Nov 26, 2019 3:29 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Complexes
- Replies: 2
- Views: 210
Complexes
What is the significance of octahedral complexes, tetrahedral complexes, an square-planar complexes? Do we need to know these for naming?
- Tue Nov 26, 2019 3:24 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Atoms in the same plane
- Replies: 4
- Views: 9066
Atoms in the same plane
How do you know when atoms will be in the same plane? And do double or triple bonds determine if atoms will be in the same plane since a molecule can't bend if it has double or triple bonds?
- Tue Nov 26, 2019 3:20 pm
- Forum: Hybridization
- Topic: sigma and pi bonds
- Replies: 3
- Views: 205
Re: sigma and pi bonds
If something is double bonded, then the sigma bond has sp^(number of electron density) hybridization, and the pi bond has p hybridization (ex 2p, with 2 being the row number), since in pi bonds, p orbitals are overlapping.
- Tue Nov 26, 2019 3:14 pm
- Forum: Bronsted Acids & Bases
- Topic: Bronsted Acids and Bases
- Replies: 6
- Views: 387
Re: Bronsted Acids and Bases
I think knowing when something is a bronsted acid/base versus when its a lewis acid/base is also important.
- Tue Nov 26, 2019 3:11 pm
- Forum: Naming
- Topic: Alphabetical Order
- Replies: 6
- Views: 376
Re: Alphabetical Order
When naming a coordination compound, write the ligands in alphabetical order and then write the metal (write ion if charged).
- Sun Nov 17, 2019 10:35 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Instantaneous Dipole versus Induced Dipole
- Replies: 4
- Views: 320
Instantaneous Dipole versus Induced Dipole
What’s the difference between instantaneous dipole and induced dipole????
- Sun Nov 17, 2019 12:50 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polar Molecules and Symmetry
- Replies: 3
- Views: 294
Polar Molecules and Symmetry
Can you assume a molecule is polar if it's non symmetrical?
- Sun Nov 17, 2019 12:31 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 2E.25
- Replies: 2
- Views: 154
2E.25
Why is part d polar? Do lone pairs cause dipole moments?
- Sat Nov 16, 2019 12:58 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Long pairs
- Replies: 3
- Views: 190
Long pairs
Why do molecules with lone pairs will have angles slightly less than what their shape would be without lone pairs?
- Sat Nov 16, 2019 12:56 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Sulfite Ion example in class
- Replies: 6
- Views: 445
Sulfite Ion example in class
In my notes I wrote that the bond angles of O-S-O are 106 degrees not 109.5 degrees, but why is this?
- Sat Nov 16, 2019 12:52 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Hydrogen Bonding
- Replies: 2
- Views: 186
Hydrogen Bonding
Is Hydrogen Bonding only present in molecules with N,O,F atoms or are there other atoms that also hydrogen bond?
- Sat Nov 16, 2019 12:49 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Distortion and Polarizability
- Replies: 2
- Views: 195
Distortion and Polarizability
How are electron distortion and polarizability of that electron related? Is distortion and changing molar mass the same?
- Sat Nov 16, 2019 12:45 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Interaction Potential Energy
- Replies: 5
- Views: 236
Interaction Potential Energy
Can someone explain what the equation for interaction potential energy is and it’s significance?
- Sat Nov 16, 2019 12:43 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: Test 2
- Replies: 5
- Views: 259
Re: Test 2
Basically all intermolecular interactions, so post midterm until next Monday’s lecture (we have to know pi and sigma bonds from that lecture).
- Sat Nov 09, 2019 1:13 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: 8
- Views: 412
Re: Hydrogen bonding
Yes because high electronegative atoms are stronger enough to attract H
- Sat Nov 09, 2019 1:11 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: instantaneous dipoles
- Replies: 3
- Views: 234
Re: instantaneous dipoles
I think surface area since increased surface area means increased noncovalent interactions between molecules which means that it will take more energy/heat to break them apart thus increasing boiling point.
- Sat Nov 09, 2019 1:07 pm
- Forum: Lewis Structures
- Topic: Lewis Structures
- Replies: 4
- Views: 339
Re: Lewis Structures
The more electronegative atom should have a negative charge if the other atom’s charge is 0, but it should have a 0 charge if the other atom’s charge is positive.
- Sat Nov 09, 2019 1:04 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: Dipole-Dipole vs London
- Replies: 4
- Views: 302
Dipole-Dipole vs London
What’s the difference between Dipole-Dipole and London Forces and what’s an example of each?
- Sat Nov 09, 2019 1:02 pm
- Forum: Resonance Structures
- Topic: 2.7 - How to determine main structure if formal charges are equal?
- Replies: 2
- Views: 107
Re: 2.7 - How to determine main structure if formal charges are equal?
The lowest energy structure would have the most electronegative N in the middle (-1 FC) and the two other N’s (+1 FC) on either side.
- Sat Nov 02, 2019 5:11 pm
- Forum: Lewis Structures
- Topic: Expanded Valence Shells
- Replies: 3
- Views: 120
Expanded Valence Shells
How exactly do expanded valence shells work, since the octet rule says that atoms share electrons until a noble gas configuration is reached?
- Sat Nov 02, 2019 5:05 pm
- Forum: Sigma & Pi Bonds
- Topic: Double bond
- Replies: 15
- Views: 511
Re: Double bond
Two things to pay attention to are formal charge and octets. Most elements want to have a full shell of valence electrons, so try to make sure that they all have 8 electrons around them. Next is to pay attention to the formal charge. If by forming a double bond, the formal charge is closer to 0, th...
- Sat Nov 02, 2019 5:01 pm
- Forum: Lewis Structures
- Topic: Ion formation vs molecule
- Replies: 2
- Views: 78
Ion formation vs molecule
How do you know if the lowest energy can be achieved by ion formation or if it can be achieved by sharing electrons? Like how do you know when you should write Na+Cl- or just NaCl?
- Sat Nov 02, 2019 4:54 pm
- Forum: Lewis Structures
- Topic: Resonance Hybrids
- Replies: 3
- Views: 145
Resonance Hybrids
What does resonance hybrids mean? And what’s an example of resonance versus resonance hybrid?
- Sat Nov 02, 2019 4:52 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Copper and Chromium Exception
- Replies: 2
- Views: 239
Copper and Chromium Exception
Can someone explain what the Copper and Chromium exceptions are for electron configuration?
- Sat Oct 26, 2019 3:45 pm
- Forum: Ionic & Covalent Bonds
- Topic: Covalent Bonds
- Replies: 5
- Views: 347
Covalent Bonds
Why don't non metals form cations?
- Sat Oct 26, 2019 3:42 pm
- Forum: Administrative Questions and Class Announcements
- Topic: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE
- Replies: 53
- Views: 5731
- Sat Oct 26, 2019 2:59 pm
- Forum: Ionic & Covalent Bonds
- Topic: Midterm 2
- Replies: 4
- Views: 158
Re: Midterm 2
Jessica Li 1F wrote:I think there's only one midterm (on Nov. 6), and that one will be cumulative all the way from Test 1.
So is the review of chemical principles (all the Test 1 stuff) going to be on the midterm? Or everything after that?
- Sat Oct 26, 2019 2:23 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: #1E17 help
- Replies: 1
- Views: 179
#1E17 help
For part b of this problem, the electron configuration for Mn is [Ar] 4s^2 3d^5 right? The question is asking from which orbital will an electron be removed to form a +1 ion, and the correct answer is from the 4s orbital but can someone explain why its from this orbital and not 3d^5?
- Sun Oct 20, 2019 6:12 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Magnetic Quantum Number ml
- Replies: 5
- Views: 235
Re: Magnetic Quantum Number ml
So like what would be an example?
- Sun Oct 20, 2019 6:11 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Tips for Subshells
- Replies: 4
- Views: 161
Re: Tips for Subshells
Wait, why can you only use a noble gas again? I’m little confused.
- Sun Oct 20, 2019 6:09 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Magnetic Quantum Number ml
- Replies: 5
- Views: 235
Magnetic Quantum Number ml
What does ml describe? I know that n’s the shell, and l is the sub shell that describes shape, but what does ml describe then?
- Sun Oct 20, 2019 6:03 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Quantum Numbers
- Replies: 3
- Views: 119
Quantum Numbers
Is the third quantum number m or ml ? I remember learning the other two were n and l but I couldn’t tell from the slides if the third was m or ml
- Sun Oct 20, 2019 5:56 pm
- Forum: *Shrodinger Equation
- Topic: Schrodinger’s Wave Function
- Replies: 3
- Views: 118
Schrodinger’s Wave Function
What does it mean by the square of the wave function represents the probability of finding an electron?
- Sun Oct 20, 2019 5:53 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Heisenberg Uncertainty Principle
- Replies: 2
- Views: 141
Heisenberg Uncertainty Principle
I know that the Heisenberg Uncertainty Principle tells us that there is a physical limit to the minimum size that atoms can exist, but is there a maximum size too? If so how could we calculate that?
- Sun Oct 13, 2019 12:35 pm
- Forum: Properties of Light
- Topic: Problem 1A.9
- Replies: 2
- Views: 162
Re: Problem 1A.9
To calculate the energy of a photon use E=hv and to match the kind of radiation to the appropriate event compare the wavelength to the chart we viewed in class which gave the type of radiation and it’s corresponding wavelength.
- Sun Oct 13, 2019 12:22 pm
- Forum: Photoelectric Effect
- Topic: Intensity, frequency, and wavelength
- Replies: 5
- Views: 404
Re: Intensity, frequency, and wavelength
From what I understood in lecture, increasing light intensity increases the number of photons which results in more ejected electrons (if the energy per photon is greater or equal to the energy needed to remove an electron).
- Sun Oct 13, 2019 12:18 pm
- Forum: DeBroglie Equation
- Topic: De Broglie Equation Clarification
- Replies: 4
- Views: 158
De Broglie Equation Clarification
I know that the De Broglie Equation states that any moving particle with momentum, p, has wavelike properties with wavelength, lambda, but what exactly are the wavelike properties?
- Sun Oct 13, 2019 12:13 pm
- Forum: Properties of Electrons
- Topic: Diffraction Patterns
- Replies: 3
- Views: 154
Diffraction Patterns
In lecture we talked about how light (waves) in general show diffraction patterns and then we used the example of and x-ray passing through a crystal, can someone clarify how this example shows diffraction patterns?
- Sun Oct 13, 2019 12:04 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: En=-hR/n^2
- Replies: 3
- Views: 318
Re: En=-hR/n^2
Yes, because Hydrogen only has one electron, but if there are multiple electrons then the electrons repel each other and you can’t calculate the ground-state energy of that atom if the electrons are already repelling each other.
- Sun Oct 13, 2019 12:00 pm
- Forum: Properties of Electrons
- Topic: wave properties of electrons
- Replies: 5
- Views: 187
Re: wave properties of electrons
In constructive interference the crests or troughs of the waves interfere with the other meaning that their amplitudes are added to get the total amplitude of the wave, however in destructive interference the crests or troughs of the waves interfere with each other meaning that the amplitudes are su...
- Fri Oct 04, 2019 7:20 pm
- Forum: Empirical & Molecular Formulas
- Topic: Chemical Formulas
- Replies: 3
- Views: 285
Re: Chemical Formulas
I remember learning in HS that Carbon goes first, then Hydrogen, and then all other elements but in alphabetical order. Hope this helps (:
- Fri Oct 04, 2019 7:18 pm
- Forum: Properties of Light
- Topic: Amplitude
- Replies: 6
- Views: 384
Re: Amplitude
Amplitude is a measure of length or distance similar to wavelength, but has no relation to frequency! I think it’s just a quantity that can be measured or solved for
- Fri Oct 04, 2019 7:14 pm
- Forum: Significant Figures
- Topic: Sig figs for percent yield
- Replies: 2
- Views: 411
Re: Sig figs for percent yield
Yes. Your answer should have the same number of sig figs as the value given in the question with the smallest amount of sig figs!
- Fri Oct 04, 2019 7:12 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3007452
Re: Post All Chemistry Jokes Here
Two chemists walk into a bar.
One says, “I’ll have an H2O.” The other says, “I’ll have an H2O, too.” The second chemist dies.
He He He (Helium Helium Helium)
One says, “I’ll have an H2O.” The other says, “I’ll have an H2O, too.” The second chemist dies.
He He He (Helium Helium Helium)