Search found 30 matches
- Tue Dec 04, 2018 12:45 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent vs angular?
- Replies: 15
- Views: 1095
Re: Bent vs angular?
Bent and angular are the same shape. However my TA said that for exams to use the term angular since that is the common term used in the textbook and practice problems
- Tue Dec 04, 2018 12:36 am
- Forum: Lewis Acids & Bases
- Topic: Determining Acidity or Basic
- Replies: 2
- Views: 348
Re: Determining Acidity or Basic
Also often times when given the formula of the compound the acids will start with an H (ex.HCl) and the base will end with an OH (ex. KOH)
Re: Anions
Also when naming coordinate compounds for Anions ending with -ite its Ligand name would end with an "-O" (ex Cl- -> Chloro) and if it ends with -ate its Ligand name would end with "-ato" (ex Nitrate-> Nitrato)
- Mon Dec 03, 2018 11:54 pm
- Forum: SI Units, Unit Conversions
- Topic: bond angles
- Replies: 5
- Views: 1125
Re: bond angles
@taywebb Yes if there is a lone pair on the central atom it would make the bond angles slightly less than the standard. This is because the lone pairs repel the other atoms away from itself making their bond angles slightly smaller
- Mon Dec 03, 2018 11:43 pm
- Forum: Naming
- Topic: Coming up with formula from name
- Replies: 3
- Views: 273
Re: Coming up with formula from name
The order for writing formulas from name is 1.) Metal 2.) Anionic Molecule (in alphabetical order) 3.) Neutral molecule
- Mon Dec 03, 2018 11:14 pm
- Forum: Bronsted Acids & Bases
- Topic: Water and Bronsted Acids/Bases
- Replies: 2
- Views: 310
Re: Water and Bronsted Acids/Bases
Water can be in other reactions but the reason that it is frequently seen in Bronsted Acid and Base problems is because water is amphoteric, meaning that it can act as either a Bronsted Acid or Base.
- Mon Dec 03, 2018 11:05 pm
- Forum: Lewis Structures
- Topic: Acid Base Lewis Structures
- Replies: 2
- Views: 406
Re: Acid Base Lewis Structures
You would still follow Lewis Structure rules to determine where to add the hydrogen. Satisfy the octet rule (if its not an exception) and check the formal charges of the atoms ( try to get them to equal zero). In the case of HClO2 adding the hydrogen atom to the oxygen instead of the Cl makes Oxygen...
- Mon Dec 03, 2018 10:58 pm
- Forum: Conjugate Acids & Bases
- Topic: conjugate acids
- Replies: 3
- Views: 556
Re: conjugate acids
Whenever you need to determine the conjugate acid of a base you add one H+. This is because conjugate acids accept an H+ from the conjugate base. Therefore it would be CH3NH3+.
- Mon Dec 03, 2018 10:39 pm
- Forum: Lewis Acids & Bases
- Topic: Acids?
- Replies: 2
- Views: 308
Re: Acids?
Weak acids are characterized by short strong bonds. Strong Acids are characterized by longer weaker bonds. This is because if the bond is weaker/less stable it is more likely to donate an H+ which makes it a strong acid.
- Mon Dec 03, 2018 10:34 pm
- Forum: Conjugate Acids & Bases
- Topic: Conjugate Acids and Bases in this formula
- Replies: 1
- Views: 229
Re: Conjugate Acids and Bases in this formula
NH3 in this case would be a conjugate Base because it lost an H+ (from NH4->NH3) and H3O+ would be a conjugate Acid because it gained an H+ ( from H20-> H30+)
- Mon Dec 03, 2018 10:29 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Water as a Monodentate
- Replies: 1
- Views: 225
Re: Water as a Monodentate
Water is Monodentate due to orbital geometry. Although there are two lone pairs on the Oxygen instead of one, but only one lone pair has the correct orientation to bond making water monodentate
- Mon Nov 26, 2018 12:20 am
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Like dissolves like
- Replies: 3
- Views: 413
Re: Like dissolves like
Non polar solutes dissolve in non polar solvents, due to London Dispersion Forces. The reason as to why non polar solutes won't dissolve in polar solvents is that the London Dispersion forces in non polar molecules are much weaker in comparison to to the polar attractions between the permanent dipol...
- Mon Nov 26, 2018 12:06 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: pi-bonds
- Replies: 7
- Views: 629
Re: pi-bonds
duverge_maciel wrote:Why do pi bonds not allow bound atoms to rotate?
Pi bonds do not allow bound atoms to rotate because rotating the atoms weakens the pi bonds. Pi bonds are the strongest when the p orbitals between atoms are parallel.
- Mon Nov 26, 2018 12:01 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular Shape
- Replies: 4
- Views: 394
Re: Molecular Shape
Yes you should continue to use formal charge, in order to draw the favored Lewis Structure, and in doing so it will help you correctly identify its shape based on lone pairs and they way the atoms are bonded
- Sun Nov 11, 2018 10:37 pm
- Forum: Ionic & Covalent Bonds
- Topic: Bonding
- Replies: 2
- Views: 356
Re: Bonding
The stronger interactions are referring to Dipole-Dipole interactions not necessarily bonds. Strength of a bond is determined by its Dissociation energy while interaction strength is determined by atom polarizability. Larger atoms have stronger interactions because their electron clouds can be more ...
- Sun Nov 11, 2018 10:24 pm
- Forum: Dipole Moments
- Topic: dipole distance
- Replies: 3
- Views: 328
Re: dipole distance
The bond lengths are related to the strength of a bond. A bond between larger atoms have a longer bond length or larger distance have a weaker bond. Atoms with shorter bond lengths have stronger, harder to break bonds
- Sun Nov 11, 2018 10:21 pm
- Forum: Dipole Moments
- Topic: Dipoles
- Replies: 2
- Views: 275
Re: Dipoles
In a bond with a more electronegative atom and a less electronegative atom the electrons will be more attracted to the atom with a higher electronegativity. As a result the more electronegative atom gains a partially negative charge and the less electronegative atom gains a partially positive charge
- Sun Nov 11, 2018 9:49 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: London Forces
- Replies: 2
- Views: 252
Re: London Forces
Every molecule experiences London Forces because electrons are constantly moving. When electrons accumulate on one side of a molecule it creates temporary dipoles. The temporary positive dipole of one molecule gets attracted to another temporary negative dipole of another molecule and create what we...
- Sun Nov 04, 2018 9:53 pm
- Forum: Electronegativity
- Topic: Electronegativity
- Replies: 5
- Views: 544
Re: Electronegativity
Electronegativity is a measure of how likely an atom can attract another electron. Understanding it is important because the difference in electronegativity between atoms can determine what kind of bond it has and how those electrons are shared.
- Sun Nov 04, 2018 9:46 pm
- Forum: Lewis Structures
- Topic: double bonds
- Replies: 2
- Views: 289
Re: double bonds
Not necessarily in all cases, but in many cases it is oxygen that double bonds to the central atom, when double bonds need to be added
- Sun Nov 04, 2018 9:42 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: When to multiply by 2
- Replies: 5
- Views: 914
Re: When to multiply by 2
If you are referring to a question like on test 2 #2. You multiply momentum by a certain factor, ex) 2. when the problem says "The uncertainty in the momentum of a ball is 2 times its momentum" In that sort of example you would calculate the momentum, then multiply that value by 2 to get t...
- Sun Oct 21, 2018 9:15 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Electron Spin
- Replies: 3
- Views: 404
Re: Electron Spin
The +1/2 indicates an atom with one type of electron spin and the -1/2 indicates atoms with another type of electron spin. And they signify a direction of the spin (either spin up or spin down).
- Wed Oct 17, 2018 2:29 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Wavelengths
- Replies: 5
- Views: 338
Re: Wavelengths
A wavelength can be negative when you are referring to direction of the wave. However, in the types of problems we are doing now we are mainly concerned with photons and photons can not have a negative wavelength.
- Wed Oct 17, 2018 2:21 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg Equation
- Replies: 2
- Views: 235
Re: Rydberg Equation
In my discussion, we discussed this and one of the main reasons why they dont want us to use the Rydberg equation is because many times they will plug the wrong "n" into the equation. However, they still want us to have a basic understanding of how to use it. One way to check if your answe...
- Mon Oct 15, 2018 12:13 am
- Forum: DeBroglie Equation
- Topic: Particle wave duality
- Replies: 3
- Views: 329
Re: Particle wave duality
The detectability of a wavelike properties is dependent upon the wavelength of that object. In lecture the Professor stated that any wavelength smaller than 10^-18m can most likely not be detected. The greater the mass of an object, the less likely that its wavelength will be detected because mass a...
- Sun Oct 14, 2018 11:54 pm
- Forum: DeBroglie Equation
- Topic: detectability of waves
- Replies: 4
- Views: 396
Re: detectability of waves
Anything less than 10^-18 does not have any measurable wave like properties. Everything does have wave like properties, but they can only be detected for very small objects in motion. The 10^-12M is referring to the wavelength of an electron and one angstrom would be 10^-10 m
- Tue Oct 09, 2018 11:14 pm
- Forum: SI Units, Unit Conversions
- Topic: Ways to remember prefixes
- Replies: 7
- Views: 4788
Re: Ways to remember prefixes
An easy way to remember prefixes is this saying " The Great Monarch King Henry Died drinking chocolate milk monday night peacefully" T: Tera --- G: Giga--- M: Mega--- K: Kilo--- H:Hecta--- D: Deca --- BASE--- d: deci--- c: centi --- m: mili--- m: micro--- n: nano--- p: pico 10^12 --- 10^9 ...
- Sat Oct 06, 2018 1:10 pm
- Forum: SI Units, Unit Conversions
- Topic: Formula Units?
- Replies: 6
- Views: 633
Re: Formula Units?
I believe formula units would be the amount of moles of that compound, multiplied by Avogadro's number
- Sat Oct 06, 2018 12:40 pm
- Forum: Limiting Reactant Calculations
- Topic: Finding Limiting Reactants
- Replies: 3
- Views: 288
Re: Finding Limiting Reactants
The limiting reactant is the reactant that's actual amount (in moles) is less than the theoretical amount of that reactant needed (in moles). You would pick one reactant and then use stoichiometry to find the theoretical amount of the other reactant. If the actual amount in moles of one reactant is ...
- Tue Oct 02, 2018 2:12 pm
- Forum: Empirical & Molecular Formulas
- Topic: Determining the Number of Atoms for the Empirical Formula
- Replies: 2
- Views: 216
Re: Determining the Number of Atoms for the Empirical Formula
Yes, when a number can be rounded from the hundredth's place it is okay to round up or down to a whole number (ex: 4.03 can be rounded to 4, and 3.98 can be rounded to 4). However if a number can't be rounded from the hundredth's place to reach a whole number, then it should be multiplied by a facto...