Search found 30 matches
- Sun Jun 10, 2018 10:40 pm
- Forum: Lewis Structures
- Topic: Central atom and octet rule?
- Replies: 12
- Views: 3011
Re: Central atom and octet rule?
Usually, but some elements can have expanded octets. I believe elements after Ne on the periodic table can have expanded octets.
- Sun Jun 10, 2018 10:33 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal charge
- Replies: 5
- Views: 655
Re: Formal charge
You count single bonds as two if you're plugging them into the equation (because they get divided by two in the equation), but you can count them as one to skip dividing by two.
- Sun Jun 10, 2018 10:26 pm
- Forum: Lewis Acids & Bases
- Topic: Donating electrons
- Replies: 3
- Views: 581
Re: Donating electrons
Correct, as Lewis acids and bases are defined by whether they accept or donate electrons.
- Sun Jun 03, 2018 10:08 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge Shortcut
- Replies: 3
- Views: 954
Re: Formal Charge Shortcut
Instead of using the equation, I take the number of valence electrons that the atom has and subtract 1 for each lone pair electron and one for each single bond attached to that atom. Maybe this is what you are referring to.
- Sun Jun 03, 2018 9:56 pm
- Forum: Resonance Structures
- Topic: Radicals
- Replies: 13
- Views: 1429
Re: Radicals
I believe you place the radical where it makes sense to due to formal charge.alexagreco1A wrote:I understand the concept of a radical, but when drawing Lewis structures, how do we decide which element has the unpaired electron?
- Sun Jun 03, 2018 9:52 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Pi bonds
- Replies: 4
- Views: 573
Re: Pi bonds
Pi bonds come from the overlap of parallel p orbitals on adjacent atoms. Rotation would break the side-by-side positioning.
- Sun May 27, 2018 7:48 pm
- Forum: Resonance Structures
- Topic: Bonds or Lone Pairs more important?
- Replies: 7
- Views: 1076
Re: Bonds or Lone Pairs more important?
I believe they are of equal importance, but formal charge clarifies which one you should use in each situation.
- Sun May 27, 2018 7:39 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizing power
- Replies: 10
- Views: 8706
Re: Polarizing power
Cations have polarizing power (ability to distort anions) and anions have polarizability (ability to be distorted by cations).
- Sun May 27, 2018 7:34 pm
- Forum: Bond Lengths & Energies
- Topic: Shorter bond length always leads to stronger bond?
- Replies: 5
- Views: 4412
Re: Shorter bond length always leads to stronger bond?
I believe so. I am not aware of any exceptions.
- Sun May 20, 2018 6:20 pm
- Forum: Dipole Moments
- Topic: London Dispersion, Induced dipole- Induced dipole, Van Der Waals
- Replies: 5
- Views: 594
Re: London Dispersion, Induced dipole- Induced dipole, Van Der Waals
I do not believe there is a difference besides naming for our purposes.
- Sun May 20, 2018 6:07 pm
- Forum: Electronegativity
- Topic: Electronegativity difference
- Replies: 3
- Views: 542
Re: Electronegativity difference
They have an electronegativity difference of 1.7, which is large enough to be considered an ionic bond.
- Sun May 20, 2018 6:01 pm
- Forum: Lewis Structures
- Topic: When to use lone pairs or bonds
- Replies: 2
- Views: 351
Re: When to use lone pairs or bonds
I think you initially connect your atoms with single bonds and then use formal charge to distribute the rest of the electrons.
- Sun May 13, 2018 8:32 pm
- Forum: Significant Figures
- Topic: Zeros in Sig Figs
- Replies: 3
- Views: 1274
Re: Zeros in Sig Figs
Zeros between two significant digits and zeros to the right of the decimal point are significant. Trailing zeros in a whole number with no decimal shown are NOT significant. For example, if it just says 230, there are only two significant figures. However, if it says "230." the decimal ind...
- Sun May 13, 2018 8:18 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal charge purpose
- Replies: 40
- Views: 6984
Re: Formal charge purpose
Making the formal charge as close to zero as possible determines the best Lewis structure.
- Sun May 13, 2018 8:00 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: formal charge equation
- Replies: 3
- Views: 612
Re: formal charge equation
formal charge = valence electrons - lone pair electrons - 1/2(bonding electrons)
Lone pair electrons are dots and bonding electrons are lines.
Lone pair electrons are dots and bonding electrons are lines.
- Sun May 06, 2018 4:20 pm
- Forum: Properties of Electrons
- Topic: Is this movement noticeable?
- Replies: 4
- Views: 564
Re: Is this movement noticeable?
Objects like cars and balls are too big to exhibit measurable wavelike qualities. Wavelike properties are noticeable on microscopic scales.
- Sun May 06, 2018 4:05 pm
- Forum: DeBroglie Equation
- Topic: Calculating wavelength of an electron
- Replies: 4
- Views: 595
Re: Calculating wavelength of an electron
You know velocity and I believe the mass of an electron is a constant. Therefore, you have mass, velocity, and Planck's, so you can use De Broglie's equation.
- Sun May 06, 2018 3:44 pm
- Forum: Properties of Light
- Topic: Wave and Particle
- Replies: 10
- Views: 1211
Re: Wave and Particle
Light acts as a stream of particles, or photons, in the photoelectric effect. The flow of photons is a wave.
- Sun Apr 29, 2018 9:23 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: 2.25
- Replies: 3
- Views: 384
Re: 2.25
I think you can memorize it based on the blocks of the periodic table.
- Sun Apr 29, 2018 9:06 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: The concept of Orbitals
- Replies: 12
- Views: 1052
Re: The concept of Orbitals
It is my understanding that orbital placement is related to the number of electrons, not energy levels. The earlier Bohr model has to do with energy levels.
- Sun Apr 29, 2018 8:59 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: 2.13
- Replies: 3
- Views: 329
Re: 2.13
I think it has to due with planes. There will be a p-orbital in the x plane, a p-orbital in the y plane, and a p-orbital in the z plane.
- Sun Apr 22, 2018 10:41 pm
- Forum: Properties of Light
- Topic: amplitude and intensity
- Replies: 11
- Views: 1022
Re: amplitude and intensity
I could see it being mentioned on the test because I believe it was discussed in class.
- Sun Apr 22, 2018 10:30 pm
- Forum: Photoelectric Effect
- Topic: Significance of intensity [ENDORSED]
- Replies: 7
- Views: 744
Re: Significance of intensity [ENDORSED]
Intensity is the number of electrons and affects the height of the wave.
- Sun Apr 22, 2018 10:23 pm
- Forum: Properties of Light
- Topic: Wavelengths
- Replies: 8
- Views: 653
Re: Wavelengths
I am focusing on the order of increasing frequency and wavelength of the visible light colors.
- Sun Apr 15, 2018 7:44 pm
- Forum: Properties of Light
- Topic: hw chapter 1 question 11
- Replies: 3
- Views: 373
Re: hw chapter 1 question 11
Lyman series: lower energy level is n=1
Balmer series: n=2
Paschen series: n=3
Brackett series: n=4
Balmer series: n=2
Paschen series: n=3
Brackett series: n=4
- Sun Apr 15, 2018 7:32 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Which mass of oxygen should be used? [ENDORSED]
- Replies: 23
- Views: 3196
Re: Which mass of oxygen should be used? [ENDORSED]
I use 16.00
- Sun Apr 15, 2018 7:26 pm
- Forum: SI Units, Unit Conversions
- Topic: Length Units
- Replies: 15
- Views: 1453
Re: Length Units
Yes, I would default to SI units.
- Sun Apr 15, 2018 7:20 pm
- Forum: Balancing Chemical Reactions
- Topic: Whole numbers
- Replies: 7
- Views: 878
Re: Whole numbers
You multiply everything by the denominator of the fraction to make the numbers whole while maintaining the right ratio.
- Sun Apr 15, 2018 7:12 pm
- Forum: Limiting Reactant Calculations
- Topic: Reagent vs. Reactant [ENDORSED]
- Replies: 6
- Views: 1356
Re: Reagent vs. Reactant [ENDORSED]
I believe they can be used interchangeably.
- Sun Apr 15, 2018 4:35 pm
- Forum: SI Units, Unit Conversions
- Topic: Volume V Density [ENDORSED]
- Replies: 5
- Views: 879
Re: Volume V Density [ENDORSED]
Volume is the amount of space something takes up, while density is the amount of mass per unit within that volume.