Search found 30 matches

by Molly Oakes 1A
Sun Jun 10, 2018 10:40 pm
Forum: Lewis Structures
Topic: Central atom and octet rule?
Replies: 12
Views: 572

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.
by Molly Oakes 1A
Sun Jun 10, 2018 10:33 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge
Replies: 5
Views: 228

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.
by Molly Oakes 1A
Sun Jun 10, 2018 10:26 pm
Forum: Lewis Acids & Bases
Topic: Donating electrons
Replies: 3
Views: 219

Re: Donating electrons

Correct, as Lewis acids and bases are defined by whether they accept or donate electrons.
by Molly Oakes 1A
Sun Jun 03, 2018 10:08 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge Shortcut
Replies: 3
Views: 293

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.
by Molly Oakes 1A
Sun Jun 03, 2018 9:56 pm
Forum: Resonance Structures
Topic: Radicals
Replies: 13
Views: 630

Re: Radicals

alexagreco1A wrote:I understand the concept of a radical, but when drawing Lewis structures, how do we decide which element has the unpaired electron?
I believe you place the radical where it makes sense to due to formal charge.
by Molly Oakes 1A
Sun Jun 03, 2018 9:52 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Pi bonds
Replies: 4
Views: 135

Re: Pi bonds

Pi bonds come from the overlap of parallel p orbitals on adjacent atoms. Rotation would break the side-by-side positioning.
by Molly Oakes 1A
Sun May 27, 2018 7:48 pm
Forum: Resonance Structures
Topic: Bonds or Lone Pairs more important?
Replies: 7
Views: 442

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.
by Molly Oakes 1A
Sun May 27, 2018 7:39 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizing power
Replies: 10
Views: 544

Re: Polarizing power

Cations have polarizing power (ability to distort anions) and anions have polarizability (ability to be distorted by cations).
by Molly Oakes 1A
Sun May 27, 2018 7:34 pm
Forum: Bond Lengths & Energies
Topic: Shorter bond length always leads to stronger bond?
Replies: 5
Views: 649

Re: Shorter bond length always leads to stronger bond?

I believe so. I am not aware of any exceptions.
by Molly Oakes 1A
Sun May 20, 2018 6:20 pm
Forum: Dipole Moments
Topic: London Dispersion, Induced dipole- Induced dipole, Van Der Waals
Replies: 5
Views: 192

Re: London Dispersion, Induced dipole- Induced dipole, Van Der Waals

I do not believe there is a difference besides naming for our purposes.
by Molly Oakes 1A
Sun May 20, 2018 6:07 pm
Forum: Electronegativity
Topic: Electronegativity difference
Replies: 3
Views: 239

Re: Electronegativity difference

They have an electronegativity difference of 1.7, which is large enough to be considered an ionic bond.
by Molly Oakes 1A
Sun May 20, 2018 6:01 pm
Forum: Lewis Structures
Topic: When to use lone pairs or bonds
Replies: 2
Views: 113

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.
by Molly Oakes 1A
Sun May 13, 2018 8:32 pm
Forum: Significant Figures
Topic: Zeros in Sig Figs
Replies: 3
Views: 260

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...
by Molly Oakes 1A
Sun May 13, 2018 8:18 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge purpose
Replies: 40
Views: 1438

Re: Formal charge purpose

Making the formal charge as close to zero as possible determines the best Lewis structure.
by Molly Oakes 1A
Sun May 13, 2018 8:00 pm
Forum: Formal Charge and Oxidation Numbers
Topic: formal charge equation
Replies: 3
Views: 188

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.
by Molly Oakes 1A
Sun May 06, 2018 4:20 pm
Forum: Properties of Electrons
Topic: Is this movement noticeable?
Replies: 4
Views: 215

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.
by Molly Oakes 1A
Sun May 06, 2018 4:05 pm
Forum: DeBroglie Equation
Topic: Calculating wavelength of an electron
Replies: 4
Views: 181

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.
by Molly Oakes 1A
Sun May 06, 2018 3:44 pm
Forum: Properties of Light
Topic: Wave and Particle
Replies: 10
Views: 384

Re: Wave and Particle

Light acts as a stream of particles, or photons, in the photoelectric effect. The flow of photons is a wave.
by Molly Oakes 1A
Sun Apr 29, 2018 9:23 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.25
Replies: 3
Views: 114

Re: 2.25

I think you can memorize it based on the blocks of the periodic table.
by Molly Oakes 1A
Sun Apr 29, 2018 9:06 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: The concept of Orbitals
Replies: 12
Views: 306

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.
by Molly Oakes 1A
Sun Apr 29, 2018 8:59 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.13
Replies: 3
Views: 81

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.
by Molly Oakes 1A
Sun Apr 22, 2018 10:41 pm
Forum: Properties of Light
Topic: amplitude and intensity
Replies: 11
Views: 338

Re: amplitude and intensity

I could see it being mentioned on the test because I believe it was discussed in class.
by Molly Oakes 1A
Sun Apr 22, 2018 10:30 pm
Forum: Photoelectric Effect
Topic: Significance of intensity [ENDORSED]
Replies: 7
Views: 214

Re: Significance of intensity [ENDORSED]

Intensity is the number of electrons and affects the height of the wave.
by Molly Oakes 1A
Sun Apr 22, 2018 10:23 pm
Forum: Properties of Light
Topic: Wavelengths
Replies: 8
Views: 249

Re: Wavelengths

I am focusing on the order of increasing frequency and wavelength of the visible light colors.
by Molly Oakes 1A
Sun Apr 15, 2018 7:44 pm
Forum: Properties of Light
Topic: hw chapter 1 question 11
Replies: 3
Views: 118

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
by Molly Oakes 1A
Sun Apr 15, 2018 7:26 pm
Forum: SI Units, Unit Conversions
Topic: Length Units
Replies: 15
Views: 524

Re: Length Units

Yes, I would default to SI units.
by Molly Oakes 1A
Sun Apr 15, 2018 7:20 pm
Forum: Balancing Chemical Reactions
Topic: Whole numbers
Replies: 7
Views: 324

Re: Whole numbers

You multiply everything by the denominator of the fraction to make the numbers whole while maintaining the right ratio.
by Molly Oakes 1A
Sun Apr 15, 2018 7:12 pm
Forum: Limiting Reactant Calculations
Topic: Reagent vs. Reactant [ENDORSED]
Replies: 6
Views: 429

Re: Reagent vs. Reactant [ENDORSED]

I believe they can be used interchangeably.
by Molly Oakes 1A
Sun Apr 15, 2018 4:35 pm
Forum: SI Units, Unit Conversions
Topic: Volume V Density [ENDORSED]
Replies: 5
Views: 269

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.

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