Search found 37 matches
- Mon Dec 03, 2018 1:23 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: what is a ligand?
- Replies: 8
- Views: 883
Re: what is a ligand?
A ligand is an ion or molecule attached to a metal atom by coordinate bonding.
- Mon Dec 03, 2018 1:19 pm
- Forum: Lewis Acids & Bases
- Topic: Lewis v. Bronsted
- Replies: 2
- Views: 308
Re: Lewis v. Bronsted
There are two complementary definitions of acids and bases that are important: the Bronsted (or Bronsted-Lowry) definition: an acid is a proton (H+ ion) donor, and a base is a proton acceptor; the Lewis definition: an acid is an electron acceptor, and a base is an electron donor
- Mon Dec 03, 2018 1:16 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Comparing Weak vs. Strong Acids and Bases
- Replies: 3
- Views: 332
Re: Comparing Weak vs. Strong Acids and Bases
Also, if it is a weak bond then more H+ ions will go into water and therefore its a strong acid
- Tue Nov 27, 2018 2:27 pm
- Forum: Hybridization
- Topic: Lone pairs
- Replies: 2
- Views: 249
Lone pairs
How do you write/find the hybridization of a lone pair?
- Mon Nov 26, 2018 2:44 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Bond Order
- Replies: 2
- Views: 295
Bond Order
is bond order on the test?
- Mon Nov 26, 2018 12:48 pm
- Forum: Hybridization
- Topic: Writing out
- Replies: 1
- Views: 256
Writing out
Can someone explain how to write out the hybridization. in the textbook it would be like : pi(H1s,C2sp2). What does that mean?
- Mon Nov 26, 2018 12:43 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: pi bond
- Replies: 4
- Views: 438
pi bond
How do you know if a molecule has a delocalized pi bond?
- Mon Nov 26, 2018 12:41 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Dipole Moment
- Replies: 1
- Views: 215
Dipole Moment
Can someone explain dipole moment and how we can tell if a molecule has it?
- Mon Nov 19, 2018 1:31 pm
- Forum: Balancing Chemical Reactions
- Topic: Why do we balance chemical equations?
- Replies: 13
- Views: 8491
Re: Why do we balance chemical equations?
To show the conservation of mass.
- Mon Nov 19, 2018 1:30 pm
- Forum: Hybridization
- Topic: Hybridization
- Replies: 3
- Views: 323
Hybridization
Can someone explain hybridization? I was really confused about what it is and how to do it?
- Mon Nov 19, 2018 1:26 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Discussion
- Replies: 6
- Views: 721
Re: Discussion
Tuesday and Wednesday discussions still take place this week
- Mon Nov 12, 2018 3:05 pm
- Forum: Ionic & Covalent Bonds
- Topic: Boiling Point
- Replies: 3
- Views: 2989
Re: Boiling Point
the more ionic, the higher the boiling point
- Mon Nov 12, 2018 3:04 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizing Power
- Replies: 5
- Views: 536
Re: Polarizing Power
Polarizing power is used to describe cations, which pull electrons away from the anions. Smaller, more positive cations would pull electrons more strongly, so they have more polarizing power (ex. Mg 2+ is small and positive so it has more polarizing power).
- Mon Nov 12, 2018 3:03 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 4
- Views: 485
Re: Bond Angles
If there are lone pair electrons it will make the degrees slight less than the usual value.
- Tue Nov 06, 2018 8:42 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Lengths
- Replies: 5
- Views: 633
Re: Bond Lengths
Is it because the bonds average out and almost move around?
- Tue Nov 06, 2018 8:40 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: HW for discussion
- Replies: 9
- Views: 1072
HW for discussion
What homework do we do for discussion since we just took a midterm?
- Tue Nov 06, 2018 8:38 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Thanksgiving Wednesday
- Replies: 9
- Views: 886
Re: Thanksgiving Wednesday
If we have a chem discussion that day will it be canceled too?
- Tue Oct 30, 2018 3:03 pm
- Forum: Student Social/Study Group
- Topic: midterm
- Replies: 1
- Views: 261
Re: midterm
I think Dr. Lavelle is going to announce it in class or send out an email.
- Tue Oct 30, 2018 3:02 pm
- Forum: General Science Questions
- Topic: Midterm studying
- Replies: 10
- Views: 1468
Re: Midterm studying
The sessions on Sunday with the UA are very helpful too.
- Tue Oct 30, 2018 3:01 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: configuration for ions
- Replies: 2
- Views: 322
configuration for ions
How do you write the electron configurations for ions? like [F]-
- Tue Oct 23, 2018 11:18 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: spin
- Replies: 4
- Views: 475
spin
How do you know is the spin is + 1/2 or -1/2 or both?
- Tue Oct 23, 2018 1:58 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Quantum Numbers
- Replies: 3
- Views: 354
Quantum Numbers
Can someone explain how to do quantum numbers (n,l,ml,ms)??
- Tue Oct 23, 2018 12:31 am
- Forum: Properties of Electrons
- Topic: Nodal surfaces
- Replies: 3
- Views: 490
Re: Nodal surfaces
Do we need to know this for the test?
- Tue Oct 23, 2018 12:30 am
- Forum: *Shrodinger Equation
- Topic: Test 2 and Shrodinger Equation
- Replies: 3
- Views: 545
Re: Test 2 and Shrodinger Equation
What is the concept behind the Equation?
- Tue Oct 23, 2018 12:26 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Wavefunction
- Replies: 1
- Views: 224
Wavefunction
can someone describe what a wave function is and it's probability density? do we need to know it for the test?
- Mon Oct 15, 2018 2:07 pm
- Forum: DeBroglie Equation
- Topic: Rest Mass?
- Replies: 4
- Views: 408
Re: Rest Mass?
Just think of problems in physics where an object is at rest. This means the velocity=0 because the object is not moving. So in this case, it means the mass of electrons when nothing is moving.
- Mon Oct 15, 2018 2:05 pm
- Forum: Properties of Light
- Topic: Wave Model
- Replies: 3
- Views: 433
Re: Wave Model
I would just understand the facts that came from the experiment. you should probably know what is in the textbook.
- Mon Oct 15, 2018 1:58 pm
- Forum: Photoelectric Effect
- Topic: Threshold energy [ENDORSED]
- Replies: 17
- Views: 2204
Re: Threshold energy [ENDORSED]
Think of threshold as the minimum grade you need on a test to get an A in the class. That's what the UA described it as.
- Mon Oct 08, 2018 7:56 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: G.21
- Replies: 1
- Views: 167
G.21
How do I find the concentration of ions in a solution? Do I need to write a net ionic equations?
Question: A solution is prepared by dissolving .500g KCL, .500g K2S, and .500g K3PO4 in 500. ml of water. What is the concentration in the final solution of (a)potassium ions; (b) sulfide ions?
Question: A solution is prepared by dissolving .500g KCL, .500g K2S, and .500g K3PO4 in 500. ml of water. What is the concentration in the final solution of (a)potassium ions; (b) sulfide ions?
- Mon Oct 08, 2018 6:00 pm
- Forum: Empirical & Molecular Formulas
- Topic: M19
- Replies: 3
- Views: 362
M19
how are we supposed to determine the molecular formula of caffeine without looking it up?
- Mon Oct 08, 2018 3:26 pm
- Forum: Empirical & Molecular Formulas
- Topic: F.7
- Replies: 5
- Views: 1724
Re: F.7
A metal M forms an oxide with the formula M20, for which the mass percentage of the metal is 88.8%. (a) What is the molar mass of the metal? (b)Write the name of the compound.
- Mon Oct 08, 2018 3:19 pm
- Forum: Empirical & Molecular Formulas
- Topic: F.7
- Replies: 5
- Views: 1724
F.7
How do I find the molar mass of the metal? I did 2x/2x+16 = .888 and solved for x. I got x as 63.43g but that is wrong. Please let me know what I did wrong!
- Mon Oct 08, 2018 12:45 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: E3
- Replies: 2
- Views: 285
E3
I don't understand how to set up an equation for this exercise. Do I find the molar ratio between the two atoms?
- Thu Oct 04, 2018 5:44 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing Chemical Equations
- Replies: 2
- Views: 176
Re: Balancing Chemical Equations
because we need to compare molar ratios.
- Thu Oct 04, 2018 5:33 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Fundamentals E 19- 7th Edition
- Replies: 1
- Views: 296
Re: Fundamentals E 19- 7th Edition
I have the same issue! it is so confusing.
- Thu Oct 04, 2018 5:31 pm
- Forum: Empirical & Molecular Formulas
- Topic: HW 1 Problem F.9
- Replies: 7
- Views: 472
Re: HW 1 Problem F.9
yes they are asking for the empirical formula
- Wed Oct 03, 2018 12:18 am
- Forum: Molarity, Solutions, Dilutions
- Topic: Module question
- Replies: 4
- Views: 676
Module question
A solution is prepared by dissolving 55.1 g of KCl in approximately 75 mL of water and then adding water to a final volume of 125 mL. What is the molarity of KCl(aq) in this solution? I converted the KCL grams into moles. then I multiplied that by .075L and finally divided by .125L. I'm not getting ...