Search found 33 matches
- Sat Jul 27, 2019 2:50 pm
- Forum: *Molecular Orbital Theory Applied To Transition Metals
- Topic: prefix
- Replies: 3
- Views: 1256
Re: prefix
It is for indication the number of atoms or ions.
- Sat Jul 27, 2019 2:47 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentate
- Replies: 8
- Views: 2183
Re: Polydentate
Polydentate ligands range in the number of atoms used to bond to a central metal atom or ion. EDTA, a hexadentate ligand, is an example of a polydentate ligand that has six donor atoms with electron pairs that can be used to bond to a central metal atom or ion.
- Sat Jul 27, 2019 2:44 pm
- Forum: Hybridization
- Topic: Electrons
- Replies: 13
- Views: 1284
Re: Electrons
Means it is exciting.
- Sat Jul 27, 2019 2:43 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Oxidation states
- Replies: 5
- Views: 685
Re: Oxidation states
You can calculate the oxidation state of a certain atom by using the sum of all positive and negative equal to 0.
- Sat Jul 27, 2019 2:38 pm
- Forum: Octet Exceptions
- Topic: Lewis Acids and Bases
- Replies: 10
- Views: 1369
Re: Lewis Acids and Bases
Lewis acid is an electron acceptor, Lewis base is an electron donor
- Sat Jul 27, 2019 2:36 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: H-bonds [ENDORSED]
- Replies: 5
- Views: 888
Re: H-bonds [ENDORSED]
There isn't a certain reason for this. You just have to memorize it.
- Wed Jul 17, 2019 5:59 pm
- Forum: Ionic & Covalent Bonds
- Topic: Dipoles
- Replies: 7
- Views: 1191
Re: Dipoles
Hydrogen bonging is a special form of dipole-dipole bonding, which is the strongest.
- Wed Jul 17, 2019 5:58 pm
- Forum: Ionic & Covalent Bonds
- Topic: Radicals
- Replies: 7
- Views: 972
Re: Radicals
Radicals are molecules that have an odd number of electrons. They are very unstable and they can only exist for a relatively short time period.
- Wed Jul 17, 2019 5:56 pm
- Forum: Lewis Structures
- Topic: Molecule Formulas
- Replies: 5
- Views: 800
Re: Molecule Formulas
I think most of the time we will be given the formulas.
- Wed Jul 17, 2019 5:55 pm
- Forum: Resonance Structures
- Topic: Resonance Hybrid
- Replies: 3
- Views: 643
Re: Resonance Hybrid
I think you don't have to know about how to draw resonance hybrid for Lewis Structure. The only thing we have to know is some molecules have several forms of their Lewis Structure, but all of them are equivalent.
- Wed Jul 17, 2019 5:52 pm
- Forum: Lewis Structures
- Topic: Complete Lewis Structure [ENDORSED]
- Replies: 6
- Views: 929
Re: Complete Lewis Structure [ENDORSED]
In my opinion, you don't have to find and write the formal charge. The reason is the formal charge is a tool to help you find which structure is more stable, you don't have to draw it on Lewis structure.
- Wed Jul 17, 2019 5:49 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: how to draw lewis structure
- Replies: 9
- Views: 941
Re: how to draw lewis structure
You can draw it in several different ways. Just count the number of electrons, and try to make each atom form eight electrons out most shell.
- Wed Jul 17, 2019 5:49 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: how to draw lewis structure
- Replies: 9
- Views: 941
Re: how to draw lewis structure
You can draw it in several different ways. Just count the number of electrons, and try to make each atom form eight electrons out most shell.
- Fri Jul 12, 2019 8:26 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 12
- Views: 1299
Re: Formal Charge
In my opinion, the answer is yes, you should draw a figure of the structure. And you also should calculate the formal charge and show the calculation steps.
- Fri Jul 12, 2019 8:23 pm
- Forum: Sigma & Pi Bonds
- Topic: Which bond would break first.
- Replies: 15
- Views: 2731
Re: Which bond would break first.
pi bond will break first, they are weaker than sigma bonds.
- Fri Jul 12, 2019 8:20 pm
- Forum: Octet Exceptions
- Topic: Octet vs formal charge
- Replies: 16
- Views: 3146
Re: Octet vs formal charge
Most of the time, these two conditions will exist together, but if under some special condition, formal charge is more important.
- Fri Jul 12, 2019 8:15 pm
- Forum: Lewis Structures
- Topic: Valence electrons
- Replies: 4
- Views: 569
Re: Valence electrons
A valence electron is an outer shell electron that is associated with an atom, so we only count the outer most shell's electrons as valence electrons.
- Fri Jul 12, 2019 8:12 pm
- Forum: Octet Exceptions
- Topic: breaking the octet
- Replies: 7
- Views: 1369
Re: breaking the octet
In my opinion, they are not breaking the octet rule. The reason that they can have more than 8 electrons is they have the d shell, which can contain more electrons.
- Fri Jul 12, 2019 8:09 pm
- Forum: Electronegativity
- Topic: Trend of Electronegativity
- Replies: 18
- Views: 4246
Re: Trend of Electronegativity
it is a little bit different, it increases when it goes up. F has a large electronegativity.
- Fri Jul 12, 2019 8:06 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic vs.covalent bonding
- Replies: 4
- Views: 767
Re: Ionic vs.covalent bonding
The covalent bond is always formed molecular, ironic bonds always form the salt.
- Tue Jul 02, 2019 11:49 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: heisenberg's
- Replies: 5
- Views: 938
Re: heisenberg's
Yes, we use = to get the minimum number.
- Tue Jul 02, 2019 11:43 am
- Forum: Einstein Equation
- Topic: Energy of photon [ENDORSED]
- Replies: 12
- Views: 1862
Re: Energy of photon [ENDORSED]
E=hv or you can get E=hc/λ from combine C=λv and E=hv.
- Tue Jul 02, 2019 11:27 am
- Forum: DeBroglie Equation
- Topic: Calculating Velocity
- Replies: 9
- Views: 1595
Re: Calculating Velocity
Most of the time we use 1/2mv^2 to calculate velocity.
- Tue Jul 02, 2019 11:18 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Spectral Lines and Energy Levels
- Replies: 3
- Views: 509
Re: Spectral Lines and Energy Levels
The highest energy always with the shortest wavelength. I'm wondering what do you mean for the 'gap'?
- Tue Jul 02, 2019 11:15 am
- Forum: Photoelectric Effect
- Topic: work function
- Replies: 4
- Views: 887
Re: work function
If you have the frequency of the photon, you can get the energy of the photon by E=hv. Then if the kinetic energy of the electron is 0, you can get the work function=energy of the photon.
- Tue Jul 02, 2019 11:12 am
- Forum: Photoelectric Effect
- Topic: Kinetic energy
- Replies: 11
- Views: 3335
Re: Kinetic energy
In my opinion, this formula is only for the kinetic energy, or sometimes the electron doesn't have kinetic energy.
- Sat Jun 29, 2019 3:26 pm
- Forum: Properties of Light
- Topic: wavelength
- Replies: 11
- Views: 1839
Re: wavelength
Yes, you were correct. However, it doesn't have to be exact peak from peak. It can be anywhere on the same horizon, and make sure it is one period.
- Sat Jun 29, 2019 3:22 pm
- Forum: Einstein Equation
- Topic: Final Grade
- Replies: 5
- Views: 5939
Re: Final Grade
It includes the discussion in Chemistry Community, weekly homework, midterm, and final grade. Your total point will be 500. You can find more detailed information from your class syllabus.
- Sat Jun 29, 2019 3:17 pm
- Forum: Einstein Equation
- Topic: Numbers to memorize [ENDORSED]
- Replies: 37
- Views: 4196
Re: Numbers to memorize [ENDORSED]
No, we don't. They will give us when we have a test.
- Sat Jun 29, 2019 3:16 pm
- Forum: Einstein Equation
- Topic: Einstein equation
- Replies: 1
- Views: 341
Einstein equation
Can we use the Einstein equation for other subjects except for light?
- Sat Jun 29, 2019 2:50 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Stoichiometric reactions
- Replies: 5
- Views: 3107
Re: Stoichiometric reactions
The key is the fraction. In a chemical reaction, the stoichiometric coefficient represents the fraction of each chemical substance. Because of the fraction of N2 H2 and NH3 is 1:3:2, the amount's fraction of them is also 1:3:2. Thus, when the N2 is 1mol, H2 is 3mol, NH3 is 2mol.
- Sat Jun 29, 2019 2:43 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Theoretical/Actual Yield
- Replies: 6
- Views: 808
Re: Theoretical/Actual Yield
Most of the time, it is in grams. Sometimes it might be the kg, but it's very rare.
- Sat Jun 29, 2019 2:41 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: MOLARITY
- Replies: 17
- Views: 2146
Re: MOLARITY
It is the concentration of a certain substance in the solution. You can use it to solve how much substance you have to put to make a certain concentration of solution, such as 100ml 80% KCl solution need how much solid KCl.