Search found 49 matches
- Sat Dec 07, 2019 5:19 pm
- Forum: Conjugate Acids & Bases
- Topic: Amphiprotic v. amphoteric
- Replies: 3
- Views: 390
Re: Amphiprotic v. amphoteric
An amphiprotic molecule will done a proton or accept a proton, thus acting as a Bronsted acid or base. An amphoteric molecule will act as Bronsted base/acid and a Lewis acid/base. Thus, an amphiprotic molecule will be an amphoteric molecule, but an amphoteric molecule may not be an amphiprotic molec...
- Sat Dec 07, 2019 5:10 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Chelating vs Polydentate Ligands
- Replies: 3
- Views: 322
Re: Chelating vs Polydentate Ligands
The porphyrin ligand is part of the heme complex in myoglobin. It is a tetradentate and a chelating ligand.
- Sat Dec 07, 2019 5:07 pm
- Forum: Naming
- Topic: Coordrination Number (Polydentate ligands)
- Replies: 2
- Views: 199
Re: Coordrination Number (Polydentate ligands)
So coordination numbers will be affected by polydentate ligands? (because the polydentate will attach to multiple sites of the transition metal)?
- Sat Dec 07, 2019 5:05 pm
- Forum: Biological Examples
- Topic: cisplatin vs transplatin?
- Replies: 2
- Views: 228
Re: cisplatin vs transplatin?
Cisplatin has the Cl on the same sides, making it stronger when it attaches to the nitrogen base of Guanine in the DNA double helix. This double attachment of chlorine will block DNA replication and thus prevent cell division. Transplatin will only have one chlorine to bind to on one side and will n...
- Sat Dec 07, 2019 5:01 pm
- Forum: Biological Examples
- Topic: heme complex chelating?
- Replies: 3
- Views: 315
Re: heme complex chelating?
The ligand to Fe is a tetra dente because it binds to iron at 4 different sites, but is a single ligand. When O2 attaches to the heme complex, it becomes myoglobin. I do not think we need to know the structure of myoglobin, probably just the structure of the heme complex. The heme complex is tetrahe...
- Sat Nov 30, 2019 12:13 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: polydente
- Replies: 2
- Views: 174
Re: polydente
You would probably have to draw it out to distinguish if there is a polydente.
- Sat Nov 30, 2019 12:12 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Strength and Weakness
- Replies: 12
- Views: 1031
Re: Strength and Weakness
You would look at the Ka value. If the Ka is a higher number, that implies the numerator is larger than the denominator, and thus more products are dissociated so it is more acidic.
- Sat Nov 30, 2019 12:11 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Strong vs Weak Acids and Bases
- Replies: 5
- Views: 382
Re: Strong vs Weak Acids and Bases
You can look at the bond length of the acid - longer bond length = more acidic. And you can also look at electronegativity difference in oxoacids = higher difference in electronegativity = more acidic.
- Sat Nov 30, 2019 12:09 pm
- Forum: Bronsted Acids & Bases
- Topic: Bronsted vs. Lewis
- Replies: 5
- Views: 313
Re: Bronsted vs. Lewis
Bronsted definition infers proton transfer and Lewis definition infers electron transfer.
- Sat Nov 30, 2019 12:03 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Acidity
- Replies: 3
- Views: 634
Re: Acidity
1. Strong acids lose H+ easily.
2. The resulting anion must be stable.
2. The resulting anion must be stable.
- Mon Nov 25, 2019 11:49 am
- Forum: Naming
- Topic: Di-, Tri-, Tetra- vs Bis-, Tris-, Tetrakis-
- Replies: 11
- Views: 895
Re: Di-, Tri-, Tetra- vs Bis-, Tris-, Tetrakis-
What is the order of naming coordination compounds?
- Mon Nov 25, 2019 11:46 am
- Forum: Naming
- Topic: Roman numerals
- Replies: 6
- Views: 338
Re: Roman numerals
What exactly is oxidation number?
- Mon Nov 25, 2019 11:44 am
- Forum: Biological Examples
- Topic: Cisplatin [ENDORSED]
- Replies: 19
- Views: 1202
Re: Cisplatin [ENDORSED]
Cisplatin aims to stop cell division. However, it will affect cancer cells and healthy cells.
- Mon Nov 25, 2019 11:43 am
- Forum: *Molecular Orbital Theory Applied To Transition Metals
- Topic: Ligands
- Replies: 5
- Views: 900
Re: Ligands
It describes the number of ligands attached to the central atom.
- Mon Nov 25, 2019 11:42 am
- Forum: Naming
- Topic: Correct naming conventions
- Replies: 5
- Views: 294
Re: Correct naming conventions
When the coordination compound has a negative charge.
- Fri Nov 15, 2019 9:50 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizing power vs polarizability
- Replies: 5
- Views: 1018
Re: Polarizing power vs polarizability
Typically, anions are polarized and cations are the polarizing power. Polarizability follow the trend of atomic radius. When you increase the size, you increase the polarizable properties.
- Fri Nov 15, 2019 9:44 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 9
- Views: 758
Re: Formal Charge
I would recommend writing it small right next to each atom so you can make sure you know which formal charge is assigned to which atom.
- Fri Nov 15, 2019 9:43 pm
- Forum: Octet Exceptions
- Topic: Reasoning for Octet Exception
- Replies: 19
- Views: 1121
Re: Reasoning for Octet Exception
Row 3 and beyond can have an expanded octet because it's in the 3rd energy level - S, P, and D blocks.
- Fri Nov 15, 2019 9:41 pm
- Forum: Dipole Moments
- Topic: Shape of Molecules affect boiling point?
- Replies: 7
- Views: 783
Re: Shape of Molecules affect boiling point?
Boiling points depend on the strength of intermolecular forces. Thus, because rod shapes have more surface area, which means more area to have Van DerWaals forces between rod shaped molecules, it will have a higher boiling point.
- Fri Nov 15, 2019 9:33 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polar vs Nonpolar Example
- Replies: 3
- Views: 308
Re: Polar vs Nonpolar Example
The trans version will have the dipoles canceling each other out (opposite ends), thus there is no dipole moment and the molecule is Nonpolar. In the cis version, the dipoles do not cancel each other out, thus creating a dipole moment making the molecule polar.
- Fri Nov 08, 2019 5:12 pm
- Forum: Bond Lengths & Energies
- Topic: Test 2 Topics
- Replies: 40
- Views: 1994
Re: Test 2 Topics
Test 2 will be during your discussion on week 8. I believe it should cover the rest of bonding and whatever we learn from then till week 8.
- Fri Nov 08, 2019 5:10 pm
- Forum: Dipole Moments
- Topic: Dipole Moment
- Replies: 3
- Views: 205
Re: Dipole Moment
There may be dipole moments in all types of bonds. Some non polar bonds may have a small dipole, but not a large enough difference in electronegativity that one atom donates all i's electrons to another. Just an unequal sharing of electrons that result in a slightly positive and negative charge.
- Fri Nov 08, 2019 5:08 pm
- Forum: Lewis Structures
- Topic: Expanded Octet
- Replies: 4
- Views: 200
Re: Expanded Octet
Yes, expanded octets start from the 3rd row because the 3rd energy level can have the d block sub shell.
- Fri Nov 08, 2019 5:06 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Electron configuration
- Replies: 7
- Views: 439
Re: Electron configuration
It is important to note that the sugbshells increase in energy going from s<p<d<f.
- Fri Nov 08, 2019 5:04 pm
- Forum: Electronegativity
- Topic: Ionic or covalent?
- Replies: 17
- Views: 705
Re: Ionic or covalent?
A bond is normally ionic if the two atoms are on the far left and far right of the periodic table. Knowing the trends of the periodic table, one can assume that if two elements are near each other, they must have similar electronegativities, and thus would form a covalent bond.
- Sun Nov 03, 2019 7:38 pm
- Forum: Resonance Structures
- Topic: Resonance structures
- Replies: 15
- Views: 731
Re: Resonance structures
the actual structure to a molecule with a resonance structure is a hybrid of its resonance structures.
- Sun Nov 03, 2019 7:30 pm
- Forum: *Shrodinger Equation
- Topic: Hamiltonian
- Replies: 2
- Views: 272
Re: Hamiltonian
What exactly is an operator? In terms of a Hamiltonian?
- Sun Nov 03, 2019 7:29 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: What are the octet exceptions?
- Replies: 11
- Views: 467
Re: What are the octet exceptions?
Elements in the 3p block can have an expanded octet.
- Sun Nov 03, 2019 7:28 pm
- Forum: Trends in The Periodic Table
- Topic: Electronegativity vs. Electron Affinity
- Replies: 3
- Views: 222
Re: Electronegativity vs. Electron Affinity
Does electron affinity have any correlation with potential energy in an atom when it receives electrons - releases energy?
- Sun Nov 03, 2019 6:25 pm
- Forum: Ionic & Covalent Bonds
- Topic: Drawing Ionic Compunds
- Replies: 7
- Views: 515
Re: Drawing Ionic Compunds
To draw an ionic lewis structure, you separately draw out each element in their own brackets.
- Mon Oct 28, 2019 10:11 am
- Forum: Lewis Structures
- Topic: Lewis Structure of Ions
- Replies: 6
- Views: 339
Re: Lewis Structure of Ions
Yes, you need the brackets to indicate the charge of the ion.
Completely unrelated, but does anyone know what the Midterm covers up to?
Completely unrelated, but does anyone know what the Midterm covers up to?
- Mon Oct 28, 2019 10:08 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Drawing Orbitals and Electron Spins
- Replies: 2
- Views: 191
Re: Drawing Orbitals and Electron Spins
Unless it asks for the spin, I would just write the configuration with [noble gas] sub shells after. However, drawing out the spins and the levels may help to visualize.
- Mon Oct 28, 2019 10:06 am
- Forum: Trends in The Periodic Table
- Topic: Electronegativity vs. Electron affinity
- Replies: 8
- Views: 537
Re: Electronegativity vs. Electron affinity
I tend to associate electronegativity with covalent bonding and electron affinity with ionic bonding. Both have the same trends in the periodic table.
- Mon Oct 28, 2019 10:04 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configuration Special Cases
- Replies: 6
- Views: 457
Re: Electron Configuration Special Cases
Yes, I think we only need to focus on chromium and copper as the two exceptions. Lavelle continues to say in class that 14A is focussed primarily on the "life science elements." I believe he mentioned in class that we must know the s and p blocks as well as the first row of the d block.
- Mon Oct 28, 2019 10:00 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Question about the Principles on Tests
- Replies: 5
- Views: 255
Re: Question about the Principles on Tests
I agree. It's best to know these principles so you can apply this when needed on the test!
- Fri Oct 18, 2019 11:29 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: ION WITH +1
- Replies: 4
- Views: 642
Re: ION WITH +1
Cations have a plus to indicate that the atom is positively charged because it lost electrons.
- Fri Oct 18, 2019 11:27 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Momentum
- Replies: 7
- Views: 264
Re: Momentum
We most likely will have to calculate momentum to solve for position or wavelength.
- Fri Oct 18, 2019 11:23 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: quantum number n, l, m
- Replies: 13
- Views: 383
Re: quantum number n, l, m
Can someone please explain what Px, Py, Pz are and how they relate to -1,0,1?
- Fri Oct 18, 2019 11:21 am
- Forum: *Shrodinger Equation
- Topic: Negative sign in Equation
- Replies: 4
- Views: 258
Re: Negative sign in Equation
Is Rydberg's constant negative? Or is the equation itself just negative?
- Fri Oct 18, 2019 11:18 am
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 144175
Re: Reading the textbook
I tried reading the textbook but I find that a lot of the material is more detailed than what we were taught in class. Should we base our material off of lecture or the textbook?
- Sat Oct 12, 2019 12:25 pm
- Forum: Properties of Light
- Topic: Circular Standing Waves and electrons
- Replies: 2
- Views: 164
Re: Circular Standing Waves and electrons
Thanks for explaining!
- Sat Oct 12, 2019 12:24 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg equation [ENDORSED]
- Replies: 73
- Views: 8392
Re: Rydberg equation [ENDORSED]
Can someone please tell me which units cancel out when solving the Rydberg equation?
- Sat Oct 12, 2019 10:58 am
- Forum: Properties of Light
- Topic: Amplitude
- Replies: 12
- Views: 500
Re: Amplitude
What is the relationship between amplitude and intensity of light?
- Sat Oct 12, 2019 10:54 am
- Forum: Limiting Reactant Calculations
- Topic: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
- Replies: 68
- Views: 6352
Re: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
When in doubt, survival by partial credit! Probably best to show your work so your TA is following along with you during the problem.
- Fri Oct 04, 2019 2:53 pm
- Forum: Limiting Reactant Calculations
- Topic: Calculating Theoretical Yield
- Replies: 9
- Views: 349
Re: Calculating Theoretical Yield
The limiting reactant will yield how much product is made.
- Fri Oct 04, 2019 2:50 pm
- Forum: Balancing Chemical Reactions
- Topic: Strategies for Balancing Chemical Equations
- Replies: 12
- Views: 703
Re: Strategies for Balancing Chemical Equations
I normally balance the metals first, then the nonmetals (except for H and O), then I balance Hydrogen and Oxygen.
- Fri Oct 04, 2019 2:44 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Units in Answer
- Replies: 18
- Views: 785
Re: Units in Answer
Regarding Sig Figs in our final answer, should we be using the amount of sig figs that is given to us in the problem and work our molar mass around that amount of sig figs?
- Fri Oct 04, 2019 2:42 pm
- Forum: SI Units, Unit Conversions
- Topic: When are the 5 posts due?
- Replies: 6
- Views: 167
Re: When are the 5 posts due?
I had the same question as well. Do any of you know if we have to complete the 5 problems for the next section by our next discussion? Or will we have time to learn the material first before having to turn in the homework?
- Wed Oct 02, 2019 11:11 am
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student [ENDORSED]
- Replies: 297
- Views: 374309
Re: Advice from a Medical Student [ENDORSED]
Thanks so much for your advice! I will definitely keep my notes handy as I go through my UCLA journey. Can you tell us a little bit more about your gap year? What types of clubs/ internships/ research opportunities/ etc. you were involved in that helped strengthen your medical school application?