Search found 33 matches

by 205458163
Sat Jul 27, 2019 2:50 pm
Forum: *Molecular Orbital Theory Applied To Transition Metals
Topic: prefix
Replies: 3
Views: 224

Re: prefix

It is for indication the number of atoms or ions.
by 205458163
Sat Jul 27, 2019 2:47 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate
Replies: 8
Views: 734

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.
by 205458163
Sat Jul 27, 2019 2:44 pm
Forum: Hybridization
Topic: Electrons
Replies: 3
Views: 195

Re: Electrons

Means it is exciting.
by 205458163
Sat Jul 27, 2019 2:43 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Oxidation states
Replies: 5
Views: 146

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.
by 205458163
Sat Jul 27, 2019 2:38 pm
Forum: Octet Exceptions
Topic: Lewis Acids and Bases
Replies: 10
Views: 338

Re: Lewis Acids and Bases

Lewis acid is an electron acceptor, Lewis base is an electron donor
by 205458163
Wed Jul 17, 2019 5:59 pm
Forum: Ionic & Covalent Bonds
Topic: Dipoles
Replies: 7
Views: 294

Re: Dipoles

Hydrogen bonging is a special form of dipole-dipole bonding, which is the strongest.
by 205458163
Wed Jul 17, 2019 5:58 pm
Forum: Ionic & Covalent Bonds
Topic: Radicals
Replies: 7
Views: 298

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.
by 205458163
Wed Jul 17, 2019 5:56 pm
Forum: Lewis Structures
Topic: Molecule Formulas
Replies: 3
Views: 224

Re: Molecule Formulas

I think most of the time we will be given the formulas.
by 205458163
Wed Jul 17, 2019 5:55 pm
Forum: Resonance Structures
Topic: Resonance Hybrid
Replies: 3
Views: 239

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.
by 205458163
Wed Jul 17, 2019 5:52 pm
Forum: Lewis Structures
Topic: Complete Lewis Structure [ENDORSED]
Replies: 6
Views: 306

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.
by 205458163
Wed Jul 17, 2019 5:49 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: how to draw lewis structure
Replies: 4
Views: 200

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.
by 205458163
Wed Jul 17, 2019 5:49 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: how to draw lewis structure
Replies: 4
Views: 200

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.
by 205458163
Fri Jul 12, 2019 8:26 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 12
Views: 444

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.
by 205458163
Fri Jul 12, 2019 8:23 pm
Forum: Sigma & Pi Bonds
Topic: Which bond would break first.
Replies: 13
Views: 434

Re: Which bond would break first.

pi bond will break first, they are weaker than sigma bonds.
by 205458163
Fri Jul 12, 2019 8:20 pm
Forum: Octet Exceptions
Topic: Octet vs formal charge
Replies: 16
Views: 470

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.
by 205458163
Fri Jul 12, 2019 8:15 pm
Forum: Lewis Structures
Topic: Valence electrons
Replies: 4
Views: 168

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.
by 205458163
Fri Jul 12, 2019 8:12 pm
Forum: Octet Exceptions
Topic: breaking the octet
Replies: 7
Views: 359

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.
by 205458163
Fri Jul 12, 2019 8:09 pm
Forum: Electronegativity
Topic: Trend of Electronegativity
Replies: 12
Views: 484

Re: Trend of Electronegativity

it is a little bit different, it increases when it goes up. F has a large electronegativity.
by 205458163
Fri Jul 12, 2019 8:06 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic vs.covalent bonding
Replies: 4
Views: 149

Re: Ionic vs.covalent bonding

The covalent bond is always formed molecular, ironic bonds always form the salt.
by 205458163
Tue Jul 02, 2019 11:49 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: heisenberg's
Replies: 4
Views: 253

Re: heisenberg's

Yes, we use = to get the minimum number.
by 205458163
Tue Jul 02, 2019 11:43 am
Forum: Einstein Equation
Topic: Energy of photon [ENDORSED]
Replies: 12
Views: 487

Re: Energy of photon [ENDORSED]

E=hv or you can get E=hc/λ from combine C=λv and E=hv.
by 205458163
Tue Jul 02, 2019 11:27 am
Forum: DeBroglie Equation
Topic: Calculating Velocity
Replies: 9
Views: 443

Re: Calculating Velocity

Most of the time we use 1/2mv^2 to calculate velocity.
by 205458163
Tue Jul 02, 2019 11:18 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Spectral Lines and Energy Levels
Replies: 3
Views: 175

Re: Spectral Lines and Energy Levels

The highest energy always with the shortest wavelength. I'm wondering what do you mean for the 'gap'?
by 205458163
Tue Jul 02, 2019 11:15 am
Forum: Photoelectric Effect
Topic: work function
Replies: 4
Views: 242

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.
by 205458163
Tue Jul 02, 2019 11:12 am
Forum: Photoelectric Effect
Topic: Kinetic energy
Replies: 11
Views: 2195

Re: Kinetic energy

In my opinion, this formula is only for the kinetic energy, or sometimes the electron doesn't have kinetic energy.
by 205458163
Sat Jun 29, 2019 3:26 pm
Forum: Properties of Light
Topic: wavelength
Replies: 11
Views: 552

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.
by 205458163
Sat Jun 29, 2019 3:22 pm
Forum: Einstein Equation
Topic: Final Grade
Replies: 2
Views: 2150

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.
by 205458163
Sat Jun 29, 2019 3:17 pm
Forum: Einstein Equation
Topic: Numbers to memorize
Replies: 24
Views: 743

Re: Numbers to memorize

No, we don't. They will give us when we have a test.
by 205458163
Sat Jun 29, 2019 3:16 pm
Forum: Einstein Equation
Topic: Einstein equation
Replies: 1
Views: 175

Einstein equation

Can we use the Einstein equation for other subjects except for light?
by 205458163
Sat Jun 29, 2019 2:50 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Stoichiometric reactions
Replies: 3
Views: 325

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.
by 205458163
Sat Jun 29, 2019 2:43 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Theoretical/Actual Yield
Replies: 6
Views: 209

Re: Theoretical/Actual Yield

Most of the time, it is in grams. Sometimes it might be the kg, but it's very rare.
by 205458163
Sat Jun 29, 2019 2:41 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: MOLARITY
Replies: 13
Views: 499

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.

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