Search found 37 matches

by APatel_4A
Wed Nov 13, 2019 12:17 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Single/Double Bonds in Resonance
Replies: 6
Views: 30

Re: Single/Double Bonds in Resonance

So all resonance structures for a molecule have the same shape? Is this always true?
by APatel_4A
Wed Nov 13, 2019 12:15 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape Name
Replies: 17
Views: 55

Re: Molecular Shape Name

I think you should try to remember all of them since it will help you remember how the structure looks. It's probably not 100% necessary, but it would be helpful.
by APatel_4A
Wed Nov 13, 2019 12:13 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: intermolecular forces
Replies: 8
Views: 42

Re: intermolecular forces

Are we expected to memorize electronegativities in order to tell whether a molecule has a dipole? And what is the difference between dipole and london forces?
by APatel_4A
Wed Nov 13, 2019 12:12 pm
Forum: Octet Exceptions
Topic: Incomplete Octets
Replies: 4
Views: 32

Re: Incomplete Octets

It's important to note that elements like carbon, nitrogen, and oxygen should not have expanded octets
by APatel_4A
Fri Nov 08, 2019 10:04 am
Forum: Hybridization
Topic: Pi bonds
Replies: 8
Views: 246

Re: Pi bonds

505312292 wrote:
605110118 wrote:What is the difference between pi and sigma?

sigma is all single bonds and pi is the second bond in a double bond


I still don't really understand this concept, can someone explain it further?
by APatel_4A
Fri Nov 08, 2019 10:02 am
Forum: Formal Charge and Oxidation Numbers
Topic: central atom
Replies: 21
Views: 77

Re: central atom

How do we know what the central atom should be?
by APatel_4A
Fri Nov 08, 2019 10:00 am
Forum: Formal Charge and Oxidation Numbers
Topic: Chlorine in center: electronegativity vs. formal charge
Replies: 4
Views: 41

Re: Chlorine in center: electronegativity vs. formal charge

VPatankar_3L wrote:Also since Oxygen is more electronegative that Chlorine, it can carry the -1 charge.

Is oxygen more electronegative than chlorine? I thought it was the other way around?
by APatel_4A
Fri Nov 08, 2019 9:57 am
Forum: Formal Charge and Oxidation Numbers
Topic: Which lewis structure will make the dominant contribution to a resonance hybrid?
Replies: 5
Views: 28

Re: Which lewis structure will make the dominant contribution to a resonance hybrid?

The most important thing is to make sure that you are using the correct number of electrons. If there is multiple ways to do so, then you must look at formal charges and choose the structure that makes the most sense given what we know about electronegativity and bonding.
by APatel_4A
Fri Nov 08, 2019 9:53 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarisability vs Polarizing Power
Replies: 15
Views: 56

Re: Polarisability vs Polarizing Power

Small and highly charged cations are said to have very high polarizing power, because they will attract negative charge. For example, the Al3+ ion has very high polarizing power.
by APatel_4A
Wed Oct 30, 2019 6:22 pm
Forum: Trends in The Periodic Table
Topic: Noble Gas
Replies: 4
Views: 32

Re: Noble Gas

Are noble gases ever included in compounds? Do they ever share or donate electrons?
by APatel_4A
Wed Oct 30, 2019 6:19 pm
Forum: Resonance Structures
Topic: 2C.3
Replies: 2
Views: 35

Re: 2C.3

I think the diagram is just pointing out that you can make the Cl formal charge 0 when there are two double bonds with oxygen.
by APatel_4A
Wed Oct 30, 2019 6:17 pm
Forum: Electronegativity
Topic: Electronegativity trends
Replies: 5
Views: 18

Re: Electronegativity trends

What about electronegativity? Does that count as a trend in the periodic table or is it just ionization energy / electron affinity?
by APatel_4A
Wed Oct 30, 2019 6:15 pm
Forum: Ionic & Covalent Bonds
Topic: Partial charge
Replies: 4
Views: 20

Re: Partial charge

Why would they be found in ionic compounds? I thought partial charge was when atoms share electrons unequally.
by APatel_4A
Wed Oct 30, 2019 6:13 pm
Forum: Octet Exceptions
Topic: Radicals
Replies: 9
Views: 43

Re: Radicals

Why do radicals exist?
by APatel_4A
Fri Oct 25, 2019 5:38 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 5
Views: 26

Re: Formal Charge

How do we know what the formal charge for the molecule should add up to? Is it always most stable if it adds up to 0?
by APatel_4A
Fri Oct 25, 2019 5:36 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity
Replies: 4
Views: 16

Re: Electron Affinity

I think electron affinities can be positive or negative depending on whether energy is released or used in order to form an anion.
by APatel_4A
Fri Oct 25, 2019 5:34 pm
Forum: Octet Exceptions
Topic: Reasoning behind the exceptions
Replies: 3
Views: 36

Re: Reasoning behind the exceptions

Aluminum can also have 6 valence electrons. As well, the electrons for P, S, and Cl would be in the 3d state because this is a lower energy level than the 4s state.
by APatel_4A
Fri Oct 25, 2019 5:32 pm
Forum: Resonance Structures
Topic: Lewis Structures
Replies: 3
Views: 17

Re: Lewis Structures

Just remember that none of the lewis structures that we can draw for a molecule with resonance are actually correct, it is a blend of all of the possibilities as we discussed in class.
by APatel_4A
Fri Oct 25, 2019 5:31 pm
Forum: Resonance Structures
Topic: Lewis Structures
Replies: 3
Views: 17

Re: Lewis Structures

You can know by drawing it out. If the molecule has resonance, then it will have the same arrangement of atoms but different ways to share the electrons, i.e. different ways to place a double bond and still satisfy the octet rule/create the most stable molecule. However many ways you can draw it and...
by APatel_4A
Wed Oct 16, 2019 5:55 pm
Forum: *Shrodinger Equation
Topic: psi vs psi^2
Replies: 7
Views: 48

Re: psi vs psi^2

Why can orbitals be referred to in terms of psi OR psi^2? Are they interchangeable?
by APatel_4A
Wed Oct 16, 2019 5:52 pm
Forum: Quantum Numbers and The H-Atom
Topic: X Y and Z
Replies: 7
Views: 50

Re: X Y and Z

There is no convention for which magnetic quantum number is associated with which plane for orbitals. Because of this, either the values will be randomly assigned to a specific orbital (given by the problem/textbook/etc) or we will just have to write all of the possible options and accept that it is...
by APatel_4A
Wed Oct 16, 2019 5:48 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: how to express answer
Replies: 6
Views: 20

Re: how to express answer

I think in lecture Professor Lavelle mentioned that in the best case scenario Δp*Δx = h/4pi, but in most situations it's actually larger than h/4pi. In the example that he did with the baseball he wrote the final velocity as v = 3.2X10^10 m/s, so I would guess that we are looking at the best case sc...
by APatel_4A
Wed Oct 16, 2019 5:43 pm
Forum: DeBroglie Equation
Topic: De Broglie Wavelength
Replies: 7
Views: 35

Re: De Broglie Wavelength

Does calculating the De Broglie wavelength just mean calculating the wavelength of an electron?
by APatel_4A
Wed Oct 16, 2019 5:42 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 1D.25
Replies: 3
Views: 35

Re: 1D.25

Yes, you can look at the quantum numbers in order to identify whether or not a certain orbital can exist. We know that 2d cannot exist because the angular momentum quantum number can never equal 2 when n =2 (It must be 0 or 1, which correspond to the s or p orbitals). On the other hand, 6f can exist...
by APatel_4A
Sun Oct 13, 2019 6:32 pm
Forum: Properties of Light
Topic: Atomic Spectra Pre-Assessment #13
Replies: 1
Views: 7

Re: Atomic Spectra Pre-Assessment #13

They technically provide the same data. Absorption line spectra display the wavelengths of light absorbed, and emission line spectra display the wavelengths of light emitted. You can measure either to get the same information, it just depends on what experimental tools were available.
by APatel_4A
Sun Oct 13, 2019 6:25 pm
Forum: Photoelectric Effect
Topic: confirmation.
Replies: 5
Views: 25

Re: confirmation.

Yes. We learned that it was unexpected, but changing to higher intensity light did not eject electrons, but changing the frequency of light emitted did. This demonstrates the particle-like qualities of light.
by APatel_4A
Sun Oct 13, 2019 6:23 pm
Forum: DeBroglie Equation
Topic: De Broglie Equation Clarification
Replies: 4
Views: 35

Re: De Broglie Equation Clarification

I think by wavelike properties it also means that there is a quantifiable wavelength and frequency. Like how we discussed in class that all objects theoretically have wavelike properties, but only we can only measure it for small objects.
by APatel_4A
Sun Oct 13, 2019 6:17 pm
Forum: Properties of Light
Topic: Visualizing wave-particle duality
Replies: 3
Views: 27

Re: Visualizing wave-particle duality

Light has both wave-like and particle-like qualities. It is hard to define light as just one thing because it has different properties depending on what experiments you are doing. We can think of light as being made up of photons or we can think of it as behaving like a wave would (with a specific w...
by APatel_4A
Mon Oct 07, 2019 7:05 pm
Forum: SI Units, Unit Conversions
Topic: Writing formulas
Replies: 4
Views: 59

Re: Writing formulas

So we would need to know how to write the chemical formula given the names of compounds? Where would we find that kind of information?
by APatel_4A
Sun Oct 06, 2019 8:14 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Wavelength Plausibility
Replies: 29
Views: 551

Re: Wavelength Plausibility

He said that it is 720 to 400 but that we can just remember 700 to 400 since it's easier!
by APatel_4A
Wed Oct 02, 2019 11:01 am
Forum: Empirical & Molecular Formulas
Topic: Homework Problem E9 Part B [ENDORSED]
Replies: 3
Views: 66

Re: Homework Problem E9 Part B [ENDORSED]

You are basically trying to find the number of salt molecules in 5.15 g. To do this, you have to convert grams to moles by dividing by the molar mass of the whole molecule. Then you must convert that number of moles to number of molecules by multiplying by 6.022 x 10^23 (the number of molecules in o...
by APatel_4A
Mon Sep 30, 2019 9:08 pm
Forum: Empirical & Molecular Formulas
Topic: Homework Problem E.9c
Replies: 5
Views: 52

Re: Homework Problem E.9c

How do you find the formula for magnesium sulfate heptahydrate?
by APatel_4A
Mon Sep 30, 2019 9:02 pm
Forum: Empirical & Molecular Formulas
Topic: Percent Mass Composition
Replies: 7
Views: 108

Re: Percent Mass Composition

Why do we need to find the percent mass composition? What does it help us to find?
by APatel_4A
Mon Sep 30, 2019 8:59 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Reactions
Replies: 25
Views: 207

Re: Balancing Reactions

Have you guys been showing all of the work when you do these problems for homework and practice? Is it better to show each step when you add a stoichiometric coefficient or do you just use the same equation and balance it all at once?
by APatel_4A
Mon Sep 30, 2019 8:56 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 129
Views: 75232

Re: Reading the textbook [ENDORSED]

I find it more helpful to look at the answers after I've done each problem. That way I know if I'm making a mistake and I don't have to redo all of the problems just because I misunderstood something. :)

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