Search found 29 matches

by Jessica Lancisi - 1I
Mon Jun 11, 2018 1:01 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Oxidation Number
Replies: 5
Views: 311

Re: Oxidation Number

Do oxidation numbers apply to covalently bonded atoms as well? Or just ionic
by Jessica Lancisi - 1I
Mon Jun 11, 2018 1:01 pm
Forum: Ionic & Covalent Bonds
Topic: Polarizability
Replies: 7
Views: 287

Re: Polarizability

So would the trend for polarizability increase from top to bottom and from left to right?
by Jessica Lancisi - 1I
Mon Jun 11, 2018 12:58 pm
Forum: Lewis Acids & Bases
Topic: lewis vs bronsten acids
Replies: 2
Views: 181

Re: lewis vs bronsten acids

Do we consider lewis acids the same as we consider bronsted acids? meaning when we refer to things being very acidic/basic and their pH is this only referring to bronsted or is it referring to both
by Jessica Lancisi - 1I
Mon Jun 11, 2018 12:56 pm
Forum: Coordinate Covalent Bonds
Topic: Covalent Character
Replies: 4
Views: 546

Re: Covalent Character

Ionic character has to do with the differences in electronegativity, if there is a larger difference in electronegativity between two molecules it is considered to have more ionic character
by Jessica Lancisi - 1I
Mon Jun 11, 2018 12:53 pm
Forum: Sigma & Pi Bonds
Topic: strength of bonds
Replies: 3
Views: 205

Re: strength of bonds

I believe this has to do with the overlapping of P orbitals in the pi bonds
by Jessica Lancisi - 1I
Mon Jun 11, 2018 12:47 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent vs. Angular
Replies: 11
Views: 357

Re: Bent vs. Angular

i think bent is for when there is 2 bonds and trigonal planar is 3 so I think those two are not interchangeable
by Jessica Lancisi - 1I
Sun Jun 10, 2018 9:02 pm
Forum: Dipole Moments
Topic: Non-polar molecules
Replies: 4
Views: 221

Re: Non-polar molecules

Can it be possible that the there are two dipole moments in opposite directions that don't cancel out? like if one of the pairs has a larger difference in electronegativity
by Jessica Lancisi - 1I
Sun Jun 10, 2018 8:57 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability for covalent bonds?
Replies: 3
Views: 369

Polarizability for covalent bonds?

Does polarizing power/polarizability apply to covalent bonds? or just ionic
by Jessica Lancisi - 1I
Sun Jun 10, 2018 2:47 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Atoms in a Plane
Replies: 4
Views: 228

Re: Atoms in a Plane

Based on the hybridization and pi bonds, because the pi bonds cannot rotate
by Jessica Lancisi - 1I
Sun Jun 10, 2018 2:43 pm
Forum: Bond Lengths & Energies
Topic: Breaking/ Forming Bonds
Replies: 2
Views: 153

Re: Breaking/ Forming Bonds

In addition to this, when a bond is broken I believe the electron is going to a higher energy state, and this requires energy
by Jessica Lancisi - 1I
Sun Jun 10, 2018 2:41 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Solubility and Polarity
Replies: 3
Views: 238

Re: Solubility and Polarity

Things that are non polar wont dissolve at all in water. Ex. Oil when mixed with water
by Jessica Lancisi - 1I
Sun Jun 10, 2018 2:39 pm
Forum: Properties of Light
Topic: Wave and Particle
Replies: 10
Views: 392

Re: Wave and Particle

I think we usually refer to photons as singular when we are doing calculations, but if the question asked how much energy was in a mole of photons, you could multiply your answer by avogadro's constant to put it in terms of moles
by Jessica Lancisi - 1I
Sun Jun 10, 2018 2:36 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Lyman, Balmer, Paschen, Brackett. etc. series and Wavelength
Replies: 3
Views: 136

Re: Lyman, Balmer, Paschen, Brackett. etc. series and Wavelength

Going off of what Paywand asked, isnt there something about how the H atom can only emit ultraviolet and visible light? not sure if this is true
by Jessica Lancisi - 1I
Sun Jun 10, 2018 2:31 pm
Forum: Photoelectric Effect
Topic: Visible or measurable light
Replies: 4
Views: 121

Re: Visible or measurable light

I believe that all light is measurable, thats why we know the wavelengths for all the types of light on the electromagnetic spectrum, but visible light is just a category of this measurable light that has 400-700nm wavelength
by Jessica Lancisi - 1I
Wed May 16, 2018 4:08 pm
Forum: Formal Charge and Oxidation Numbers
Topic: FORMAL CHARGE
Replies: 9
Views: 282

Re: FORMAL CHARGE

Can the lone pair electrons also be shown as lines on the sides of the atom?
by Jessica Lancisi - 1I
Wed May 16, 2018 4:03 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Oxidation Number & Bonds
Replies: 6
Views: 222

Re: Oxidation Number & Bonds

I dont think there is an intermediary because If it gained any less than 7 electrons/lost any more than 1 it would no longer have an octet
by Jessica Lancisi - 1I
Wed May 16, 2018 3:54 pm
Forum: Bond Lengths & Energies
Topic: Double Bond vs Triple Bond
Replies: 7
Views: 625

Re: Double Bond vs Triple Bond

Im not positive, but I think this may have to do with the formal charge of the atoms being bonded
by Jessica Lancisi - 1I
Wed May 16, 2018 3:47 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Bonds
Replies: 4
Views: 305

Re: Bonds

does this also have to do with the electron shielding concept that was a part of chapter 2?
by Jessica Lancisi - 1I
Wed May 16, 2018 3:46 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarization and Solubiity
Replies: 2
Views: 151

Re: Polarization and Solubiity

yes, like the example in class where H was bonded to F and I, since I is bigger it will be less soluble, and the most polarizable. The HI bond will also be more covalent than the HF bond I believe
by Jessica Lancisi - 1I
Tue May 08, 2018 10:00 am
Forum: Trends in The Periodic Table
Topic: Homework Problem 2.59 [ENDORSED]
Replies: 1
Views: 102

Homework Problem 2.59 [ENDORSED]

The problem states: place the following ions in order of increasing ionic radium: S^2-, Cl^-1, and P^-3
The answer in the solutions manual says that P is largest, then S, then Cl, but why? once they become these ions they all have the same number of electrons, so how would you distinguish size here?
by Jessica Lancisi - 1I
Mon Apr 23, 2018 10:43 am
Forum: Properties of Light
Topic: Light
Replies: 5
Views: 156

Re: Light

is a photon an actual particle for which you could see a "particle" shape for if you were really really tiny? or is it just a wave that is referred to as a particle so it can be quantifies?
by Jessica Lancisi - 1I
Sat Apr 21, 2018 12:09 am
Forum: Photoelectric Effect
Topic: Photoelectric effect pre-assessment module [ENDORSED]
Replies: 2
Views: 105

Photoelectric effect pre-assessment module [ENDORSED]

This may be a stupid question but is there a way to check and see which answers we got correct on the pre-assessments? I just finished the photoelectric effect one and was hoping id be able to see what I got right/what I need to work on
by Jessica Lancisi - 1I
Fri Apr 20, 2018 9:53 pm
Forum: Properties of Light
Topic: still don't uderrsatnd what a photon is [ENDORSED]
Replies: 20
Views: 411

Re: still don't uderrsatnd what a photon is [ENDORSED]

Since a photon does not have mass, is it better to think of a photon as a concept/idea that can be assigned an amount of energy rather than a specific 'particle' that you can visualize like a proton or an electron? not sure if this makes sense
by Jessica Lancisi - 1I
Thu Apr 12, 2018 10:50 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Formula Units
Replies: 6
Views: 2651

Re: Formula Units

I read on another post that because formula units apply to salts like NACL, you cannot refer to these salts as molecules? is this true?
by Jessica Lancisi - 1I
Thu Apr 12, 2018 10:47 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Accuracy vs Precision
Replies: 23
Views: 777

Re: Accuracy vs Precision

@Paywand Baghal, I think that it would be the other way around- In a chemical context, accuracy would be getting the correct value, and precision would be getting the same or close to the same result each time. Precision without accuracy shows that there may be a mistake in the experiment that keeps...
by Jessica Lancisi - 1I
Thu Apr 12, 2018 10:29 pm
Forum: SI Units, Unit Conversions
Topic: writing out conversions in one long line vs. steps
Replies: 16
Views: 619

Re: writing out conversions in one long line vs. steps

In addition to being able to see what cancels easiest, the chances of missing something or leaving something out when you do this horizontally are much lower than if you start each step on a new vertical line! this will minimize accidental mistakes
by Jessica Lancisi - 1I
Thu Apr 12, 2018 10:26 pm
Forum: Significant Figures
Topic: Sig fifs in 750 [ENDORSED]
Replies: 6
Views: 379

Re: Sig fifs in 750 [ENDORSED]

does this work the same way in reverse? like is .075 only 2 significant figures or is it 3?
by Jessica Lancisi - 1I
Thu Apr 12, 2018 10:23 pm
Forum: Limiting Reactant Calculations
Topic: Knowing if it's Limiting Reactions
Replies: 6
Views: 300

Re: Knowing if it's Limiting Reactions

Although I know this wont apply to all problems, but often times the questions that are just stoich will give you only one quantity/mass to use in your calculation, and problems that involve limiting reactants will give you 2 or more masses. If you only have one quantity to work with, it cannot be l...
by Jessica Lancisi - 1I
Thu Apr 12, 2018 10:09 pm
Forum: Balancing Chemical Reactions
Topic: Fastest way to balance chemical equation
Replies: 9
Views: 1267

Re: Fastest way to balance chemical equation

for the equations that seem to never balance-meaning you feel like you just keep adding and adding coefficients, I think the fastest way would probably be to use a system of equations. to do this you would label the coefficients for each piece of the reaction as a through d, and come up with a syste...

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