Search found 30 matches
- Thu Dec 06, 2018 7:16 pm
- Forum: Naming
- Topic: Naming Complexes
- Replies: 1
- Views: 270
Re: Naming Complexes
You use suffix bis-, tris-, etc. when there already is bi-, tri-, etc. in the ligand. For example, Dichlorobis(ethylenediamine)cobalt(III) chloride.
- Thu Dec 06, 2018 7:09 pm
- Forum: Naming
- Topic: oxidation number
- Replies: 4
- Views: 455
Re: oxidation number
You could figure out the charge of the ligands using the periodic table. For example nitrogen would have a -5 charge when it's considered as an ion, while Carbon has a +4 charge. So the ligand CN would have a total -1 charge. For common compounds such as H20, NH3, and CN-, it is better to memorize t...
K3[CoF6]
Why do we not follow the alphabetic rule when we say that K3[CoF6] is "potassium hexafluorocobaltate(3)" rather than "potassium cobaltate(3)hexafluoro?"
- Sat Dec 01, 2018 2:49 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: repulsion strength
- Replies: 3
- Views: 632
Re: repulsion strength
Like electrons in a lone pair has a stronger repulsion strength than a shared bond electron, two lone pairs would have a stronger repulsion strength than a shared bond electron+lone pair.
Re: Naming
And also, I know Dr. Lavelle wants us to know the lewis structures for the common polyatomic ions such as nitrate, sulfate, carbonate. It is useful to know it at the top of your head for during exams!
- Sat Dec 01, 2018 2:39 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Induced dipoles
- Replies: 7
- Views: 877
Re: Induced dipoles
Adding on, this phenomenon is also known as Van der Waals Force. This takes place in every single molecular relationship such as hydrogen and dipole-ionic.
- Thu Nov 22, 2018 10:57 am
- Forum: Bond Lengths & Energies
- Topic: H bonding
- Replies: 14
- Views: 1426
Re: H bonding
You can visually see this as a large pot of water(more hydrogen bonds) takes a higher temperature to boil than a small pot of water.
- Thu Nov 22, 2018 10:52 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent - Lone Pairs
- Replies: 8
- Views: 911
Re: Bent - Lone Pairs
Adding on, if there were two lone pairs, then the angles between the atoms would be smaller than if there were only one lone pair even if they were both bent shape.
- Thu Nov 22, 2018 10:49 am
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Sigma and Pi Bonds
- Replies: 3
- Views: 369
Re: Sigma and Pi Bonds
Hello Brice,
this picture is pretty helpful.
After every first single bond, it is a pi bond.
So if it was a double bond(which is basically 2 single bonds), then the first single bond would be sigma, and everything after is pi bond.
this picture is pretty helpful.
After every first single bond, it is a pi bond.
So if it was a double bond(which is basically 2 single bonds), then the first single bond would be sigma, and everything after is pi bond.
- Thu Nov 15, 2018 11:20 am
- Forum: SI Units, Unit Conversions
- Topic: bond angles
- Replies: 5
- Views: 1126
Re: bond angles
You could think logically for some of them, for example how a triangular planar is equal angles, and therefore is 360/3=120 degrees. For some, it's just pure memorization. This is a very useful chart I found!
- Thu Nov 15, 2018 11:12 am
- Forum: SI Units, Unit Conversions
- Topic: lewis structure shape
- Replies: 6
- Views: 898
Re: lewis structure shape
Each of the shapes are affected by mainly two things: If they have lone pairs and how many different bonds they have with different atoms.
- Thu Nov 15, 2018 10:58 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: bond angle
- Replies: 4
- Views: 399
Re: bond angle
Usually if there is a electronegative difference from different elements, or the presence of lone pairs, does it affect the angle in between.
- Sat Nov 10, 2018 6:24 pm
- Forum: Dipole Moments
- Topic: Dipole Induced Dipole
- Replies: 2
- Views: 213
Re: Dipole Induced Dipole
This is the same thing as Van der waals, where it is present in all types of bonds: ionic, covalent, hydrogen.
- Sat Nov 10, 2018 6:22 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizability v. Electronegativity
- Replies: 3
- Views: 2240
Re: Polarizability v. Electronegativity
Basically if a molecule has a great amount of electronegative difference, they are usually polar. For example, H20. The electronegative difference is large, therefore more electrons go toward oxygen, giving the oxygen a partial negative, and hydrogen a partial positive(polar molecule).
- Sat Nov 10, 2018 6:16 pm
- Forum: Lewis Structures
- Topic: polyatomic ions
- Replies: 2
- Views: 392
Re: polyatomic ions
Yes, it is basically the same process as a polyatomic lewis structure, except you add/subtract valence electrons(based on the charge given in the chemical formula) on the actual lewis structure. Also bracket it and put the charge on the outside. So for example, on the attached picture, it would regu...
- Thu Nov 01, 2018 11:35 am
- Forum: Photoelectric Effect
- Topic: Rate at which electrons are emitted
- Replies: 2
- Views: 469
Re: Rate at which electrons are emitted
Basically if you are over the threshold level, then increasing the intensity(#of electrons), will increase the rate of the electrons that are emitted.
- Thu Nov 01, 2018 11:32 am
- Forum: Lewis Structures
- Topic: How to determine central atom
- Replies: 8
- Views: 1400
Re: How to determine central atom
Adding on, mostly in Lewis Structures, the element that is used the least like the C in CH4 usually goes in the middle, because it is also based on symmetry.
- Thu Nov 01, 2018 11:30 am
- Forum: Trends in The Periodic Table
- Topic: Electron Affinity, Ionization energy, and Effective Nuclear Charge
- Replies: 2
- Views: 243
Re: Electron Affinity, Ionization energy, and Effective Nuclear Charge
Electronic Affinity & Ionization energy are the same concept, where electronic affinity is how strong the element wants the e-, and the ionization energy is how strong energy is needed to remove a e-. Electronic Affinity and Ionization energy are stronger as you go up and to the right, because i...
- Thu Oct 25, 2018 10:20 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Ionization Energy
- Replies: 3
- Views: 379
Re: Ionization Energy
Adding on, this could be seen in NaCl, where the Na from the s block, and the Cl from the p block is very reactive with each other in order to create more stable bond.
- Thu Oct 25, 2018 10:12 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Nodal Planes on f-orbitals
- Replies: 4
- Views: 2045
Re: Nodal Planes on f-orbitals
F orbitals would have 3 nodal planes. The number of nodal planes is equal to the value of the angular momentum quantum number, l. For example s orbital would have 0 nodal planes, p orbital would have 1 nodal plane, d would have 2 nodal plane, and so on.
- Thu Oct 25, 2018 10:05 pm
- Forum: Properties of Light
- Topic: Chapter 1 number 33
- Replies: 2
- Views: 352
Re: Chapter 1 number 33
Adding on, the formula for the photoelectric effect is: Ephoton=Threshold Level+Kinetic Energy of the electron.
- Thu Oct 18, 2018 5:53 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Position v. Momentum
- Replies: 1
- Views: 199
Re: Position v. Momentum
The way my TA explained it was, imagine if you had a chair(that you can't see, but is somewhere) and you pushed it, then it appears, the position of the chair is now more precise, however because you influenced the position, the less precise the momentum is bc you changed its momentum. So if you ima...
- Thu Oct 18, 2018 5:35 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Emission Spectrum and Atomic Spectrum
- Replies: 2
- Views: 269
Re: Emission Spectrum and Atomic Spectrum
Hi sonalivij, If you're asking about the photoelectric effect, then it is true that we only see light(from e- emission) that is reflected. But the light that is absorbed is also seen because we are pointing actual photons(lights) into the metal. That is why we see the light that is being absorbed an...
- Thu Oct 18, 2018 5:08 pm
- Forum: Properties of Light
- Topic: Speed of Light
- Replies: 5
- Views: 578
Re: Speed of Light
Hi Matia,
I think in terms of sig figs for constant, just copy the full number from that is given on the formula sheet.
But for the actual final answer, use the sig figs of the numbers that are given in the question.
I think in terms of sig figs for constant, just copy the full number from that is given on the formula sheet.
But for the actual final answer, use the sig figs of the numbers that are given in the question.
- Thu Oct 11, 2018 11:13 am
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Molar mass
- Replies: 3
- Views: 4030
Re: Molar mass
Hi! If you're asking when we have a grams--> molar mass--> coefficient, then you only multiply by the coefficient if you're changing compound to another compound. Or if you're changing compound to atom. coefficient.jpg In this example, you multiply the given grams by the molar mass to get the moles ...
- Thu Oct 11, 2018 11:00 am
- Forum: Photoelectric Effect
- Topic: equations
- Replies: 1
- Views: 172
Re: equations
Hi!
The E=hv, is for the energy of the photon(light) that coming to hit the metal. And Ek=1/2mv^2 is the kinetic energy of the electron that is given out, if the energy of the photon is over the threshold energy.
The kinetic energy=energy of photon-threshold energy.
The E=hv, is for the energy of the photon(light) that coming to hit the metal. And Ek=1/2mv^2 is the kinetic energy of the electron that is given out, if the energy of the photon is over the threshold energy.
The kinetic energy=energy of photon-threshold energy.
- Thu Oct 11, 2018 10:53 am
- Forum: Properties of Electrons
- Topic: Energy of Photons
- Replies: 1
- Views: 156
Re: Energy of Photons
Hi!
I would think keV is 10^3eV. And for the eV, I attached a picture.
I would think keV is 10^3eV. And for the eV, I attached a picture.
- Wed Oct 03, 2018 11:33 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Hydrogen Molar Mass HW E9
- Replies: 5
- Views: 910
Re: Hydrogen Molar Mass HW E9
Usually when you are calculating in between steps for the answer, it is best to use the whole exact number such as the 1.0079. My TA said that they will never take off points for adding more sig figs than necessary. For example, writing 5 sig figs, than the required 3 sig figs. However, they will ta...
- Wed Oct 03, 2018 11:25 pm
- Forum: Balancing Chemical Reactions
- Topic: Order of balancing an equation
- Replies: 8
- Views: 618
Re: Order of balancing an equation
Adding on to what Ramsha said, look at both sides to see if there is an element that is present only once on each side. If there is, start with that element. However, if there isn't, find another.
- Wed Oct 03, 2018 11:19 pm
- Forum: SI Units, Unit Conversions
- Topic: Unit Notation
- Replies: 2
- Views: 261
Re: Unit Notation
I am guessing that the textbook uses the -1 exponent, because it might be confused as an 'or' sign on print. But at the end of the day, it is the same thing.