Search found 29 matches
- Mon Jun 11, 2018 1:01 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Oxidation Number
- Replies: 5
- Views: 878
Re: Oxidation Number
Do oxidation numbers apply to covalently bonded atoms as well? Or just ionic
- Mon Jun 11, 2018 1:01 pm
- Forum: Ionic & Covalent Bonds
- Topic: Polarizability
- Replies: 7
- Views: 869
Re: Polarizability
So would the trend for polarizability increase from top to bottom and from left to right?
- Mon Jun 11, 2018 12:58 pm
- Forum: Lewis Acids & Bases
- Topic: lewis vs bronsten acids
- Replies: 2
- Views: 474
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
- Mon Jun 11, 2018 12:56 pm
- Forum: Coordinate Covalent Bonds
- Topic: Covalent Character
- Replies: 4
- Views: 1114
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
- Mon Jun 11, 2018 12:53 pm
- Forum: Sigma & Pi Bonds
- Topic: strength of bonds
- Replies: 3
- Views: 497
Re: strength of bonds
I believe this has to do with the overlapping of P orbitals in the pi bonds
- Mon Jun 11, 2018 12:47 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent vs. Angular
- Replies: 11
- Views: 1137
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
- Sun Jun 10, 2018 9:02 pm
- Forum: Dipole Moments
- Topic: Non-polar molecules
- Replies: 4
- Views: 603
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
- Sun Jun 10, 2018 8:57 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizability for covalent bonds?
- Replies: 3
- Views: 771
Polarizability for covalent bonds?
Does polarizing power/polarizability apply to covalent bonds? or just ionic
- Sun Jun 10, 2018 2:47 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Atoms in a Plane
- Replies: 4
- Views: 587
Re: Atoms in a Plane
Based on the hybridization and pi bonds, because the pi bonds cannot rotate
- Sun Jun 10, 2018 2:43 pm
- Forum: Bond Lengths & Energies
- Topic: Breaking/ Forming Bonds
- Replies: 2
- Views: 496
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
- Sun Jun 10, 2018 2:41 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Solubility and Polarity
- Replies: 3
- Views: 743
Re: Solubility and Polarity
Things that are non polar wont dissolve at all in water. Ex. Oil when mixed with water
- Sun Jun 10, 2018 2:39 pm
- Forum: Properties of Light
- Topic: Wave and Particle
- Replies: 10
- Views: 1209
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
- 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: 668
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
- Sun Jun 10, 2018 2:31 pm
- Forum: Photoelectric Effect
- Topic: Visible or measurable light
- Replies: 4
- Views: 448
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
- Wed May 16, 2018 4:08 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: FORMAL CHARGE
- Replies: 9
- Views: 904
Re: FORMAL CHARGE
Can the lone pair electrons also be shown as lines on the sides of the atom?
- Wed May 16, 2018 4:03 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Oxidation Number & Bonds
- Replies: 6
- Views: 2560
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
- Wed May 16, 2018 3:54 pm
- Forum: Bond Lengths & Energies
- Topic: Double Bond vs Triple Bond
- Replies: 7
- Views: 1223
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
- Wed May 16, 2018 3:47 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Bonds
- Replies: 4
- Views: 682
Re: Bonds
does this also have to do with the electron shielding concept that was a part of chapter 2?
- Wed May 16, 2018 3:46 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarization and Solubiity
- Replies: 2
- Views: 670
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
- Tue May 08, 2018 10:00 am
- Forum: Trends in The Periodic Table
- Topic: Homework Problem 2.59 [ENDORSED]
- Replies: 1
- Views: 315
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?
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?
- Mon Apr 23, 2018 10:43 am
- Forum: Properties of Light
- Topic: Light
- Replies: 5
- Views: 503
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?
- Sat Apr 21, 2018 12:09 am
- Forum: Photoelectric Effect
- Topic: Photoelectric effect pre-assessment module [ENDORSED]
- Replies: 2
- Views: 327
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
- Fri Apr 20, 2018 9:53 pm
- Forum: Properties of Light
- Topic: still don't uderrsatnd what a photon is [ENDORSED]
- Replies: 20
- Views: 1311
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
- Thu Apr 12, 2018 10:50 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Formula Units
- Replies: 6
- Views: 16723
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?
- Thu Apr 12, 2018 10:47 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Accuracy vs Precision
- Replies: 23
- Views: 2586
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...
- 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: 1392
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
- Thu Apr 12, 2018 10:26 pm
- Forum: Significant Figures
- Topic: Sig fifs in 750 [ENDORSED]
- Replies: 6
- Views: 1336
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?
- Thu Apr 12, 2018 10:23 pm
- Forum: Limiting Reactant Calculations
- Topic: Knowing if it's Limiting Reactions
- Replies: 6
- Views: 710
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...
- Thu Apr 12, 2018 10:09 pm
- Forum: Balancing Chemical Reactions
- Topic: Fastest way to balance chemical equation
- Replies: 9
- Views: 16442
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...