Search found 54 matches
- Sat Dec 07, 2019 5:10 pm
- Forum: Biological Examples
- Topic: Vitamin B12
- Replies: 1
- Views: 167
Vitamin B12
What's the transition metal and ligands of it in vitamin B12?
- Sat Dec 07, 2019 1:50 pm
- Forum: Bronsted Acids & Bases
- Topic: CHOOH
- Replies: 1
- Views: 358
CHOOH
Is there a specific reason why CHOOH or CH3COOH is written with two OO's and not O2??
- Sat Dec 07, 2019 11:20 am
- Forum: Hybridization
- Topic: Ammonia
- Replies: 4
- Views: 319
Re: Ammonia
NH3 has 4 areas of electron density- three bonded regions and one region with a lone pair. Therefore, the hybridization is sp3.
- Sat Dec 07, 2019 11:15 am
- Forum: Administrative Questions and Class Announcements
- Topic: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]
- Replies: 115
- Views: 14240
Re: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]
How would one phrase number 36C?? Also, 36B is both Amphoteric and amphiprotic, right?
- Fri Dec 06, 2019 1:40 pm
- Forum: Lewis Structures
- Topic: Oxoacids
- Replies: 1
- Views: 246
Oxoacids
Today, Lavelle explained how Oxoacids have to have their hydrogens bonded with an oxygen because that's how they're structured. Are there any similar rules to this??
- Fri Dec 06, 2019 1:34 pm
- Forum: Polyprotic Acids & Bases
- Topic: Direction of Reaction of Polyprotic Acids
- Replies: 2
- Views: 262
Re: Direction of Reaction of Polyprotic Acids
Can you elaborate on that? What are we looking for when comparing the pH and pKa?
- Fri Dec 06, 2019 1:09 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Determining Shape and Placement of atoms
- Replies: 1
- Views: 202
Determining Shape and Placement of atoms
When we are drawing a normal molecule, how do we know where each go? For example, for C5H5NO2, what stops me from bonding carbons to Oxygens only or to Hydrogens only. How do we determine the correct, biological order they are supposed to be in????
- Fri Dec 06, 2019 1:03 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Determining polarity from VSPER
- Replies: 4
- Views: 493
Determining polarity from VSPER
How can we determine the polarity just from the VSPER formula?? Pls explain
- Fri Dec 06, 2019 12:49 am
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Strong vs. weak acids and bases
- Replies: 3
- Views: 334
Re: Strong vs. weak acids and bases
Can someone explain why the trend makes sense with details?
- Fri Dec 06, 2019 12:47 am
- Forum: Lewis Structures
- Topic: Bent or Angular?
- Replies: 18
- Views: 1216
Re: Bent or Angular?
All the same.
- Fri Dec 06, 2019 12:43 am
- Forum: Sigma & Pi Bonds
- Topic: Characteristics
- Replies: 2
- Views: 315
Characteristics
A while ago, Lavelle emphasized the fact that Sigma bonds allowed rotation while Pi bonds did not are were rigid. How is this relevant to now? How did it relate to what we learned after?
- Fri Dec 06, 2019 12:41 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: what is a ligand?
- Replies: 7
- Views: 542
Re: what is a ligand?
So ligands only exist when talking about transition metals?
- Fri Dec 06, 2019 12:40 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR Formulas
- Replies: 2
- Views: 210
Re: VSEPR Formulas
Yes, it has a bent molecular shape. But its AX2E1
- Fri Dec 06, 2019 12:37 am
- Forum: Identifying Acidic & Basic Salts
- Topic: Electrons and pH
- Replies: 2
- Views: 233
Re: Electrons and pH
Thanks!!
- Fri Dec 06, 2019 12:26 am
- Forum: Resonance Structures
- Topic: localization
- Replies: 1
- Views: 237
Re: localization
I believe so. Since those with resonance structures are basically made up of all of those resonance structures, all electrons involved are delocalized.
- Fri Dec 06, 2019 12:24 am
- Forum: Bronsted Acids & Bases
- Topic: Acidic Strength
- Replies: 3
- Views: 295
Re: Acidic Strength
Remember, electronegativity increases going up the periodic table. Since Cl is above Br, Cl is more electronegative.
- Fri Dec 06, 2019 12:23 am
- Forum: Identifying Acidic & Basic Salts
- Topic: Electrons and pH
- Replies: 2
- Views: 233
Electrons and pH
NH3 is basic with an 11 pH. When an electron is added, creating NH4+, the pH decreased and it became more acidic. Why did adding an electron do this to the acidity?
- Tue Dec 03, 2019 6:51 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Strong vs. Weak Acids and Bases
- Replies: 4
- Views: 299
Re: Strong vs. Weak Acids and Bases
What do you refer to when you say equilibrium constant?
- Tue Dec 03, 2019 5:44 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Concentration
- Replies: 2
- Views: 220
Concentration
Why is the concentration of [H30+] the same as [H+]?
- Tue Dec 03, 2019 12:15 am
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Strong Acids
- Replies: 4
- Views: 335
Re: Strong Acids
So because they (typically) completely dissolve in water, they have no Ka value. Can only strong acids do this then? Have no Ka value?
- Tue Dec 03, 2019 12:09 am
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Anion stability
- Replies: 6
- Views: 502
Re: Anion stability
According to this website at https://employees.csbsju.edu/cschaller/Reactivity/mechreview/UMintermed.htm , The larger the atom, and the further the electrons from the nucleus, the more polarizable it is. The more polarizable the atom, the more stable the anion. Within a row of the periodic table, t...
- Mon Dec 02, 2019 11:40 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Chelating complexes
- Replies: 6
- Views: 408
Re: Chelating complexes
Are there any exceptions to this??
- Mon Dec 02, 2019 9:30 pm
- Forum: Resonance Structures
- Topic: Delocalization
- Replies: 6
- Views: 617
Delocalization
How can we tell the difference between a structure with localized electrons versus delocalized electrons?
- Wed Nov 20, 2019 12:45 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Why is CBr2Cl2 polar?
- Replies: 7
- Views: 897
Re: Why is CBr2Cl2 polar?
Can someone further explain this? I still don't understand how this is polar. No matter where the two Cl remain within the tetrahedral shape, the dipoles won't face the same way, so how can it be polar? Or is any molecule polar as long as their dipoles don't cancel????
- Mon Nov 18, 2019 6:56 pm
- Forum: Sigma & Pi Bonds
- Topic: HW Question 2.63
- Replies: 1
- Views: 194
Re: HW Question 2.63
In the problem, only two bonds are shown to be connected on either side of Oxygen. So, that means that Oxygen must have 2 lone pairs to complete its octet. So, its actual molecular shape is a bent tetrahedral whose angles are 109.5!
- Mon Nov 18, 2019 6:08 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Component Orbitals of pi Bonds
- Replies: 3
- Views: 224
Re: Component Orbitals of pi Bonds
What does that mean?
- Sun Nov 17, 2019 11:38 pm
- Forum: Administrative Questions and Class Announcements
- Topic: test 2
- Replies: 7
- Views: 405
Re: test 2
Nathan Rothschild_3D wrote:Does anyone know what page in the book has all of the shapes?
I think page 113 is a good start
- Sun Nov 17, 2019 11:04 pm
- Forum: Hybridization
- Topic: Pi and Sigma Bonds
- Replies: 17
- Views: 1300
Re: Pi and Sigma Bonds
205150314 wrote:why do we need to give bonds a secondary name? what do the names mean?
Yeah, why does it matter? It feels like they have no other significance other than giving bonds a new name.
- Sun Nov 17, 2019 11:02 pm
- Forum: Ionic & Covalent Bonds
- Topic: Dispersion Forces
- Replies: 2
- Views: 231
Re: Dispersion Forces
The london forces between Br2 and I2 are stronger than in F2 and Cl2 because Br2 and I2 are bigger in size and have a higher polarizability. Remember, london forces are stronger when there is more surface area that it can interact with. Since Br2 and I2 have a stronger london force, it takes more en...
- Sun Nov 17, 2019 10:51 pm
- Forum: Trends in The Periodic Table
- Topic: Trend for Polarizability
- Replies: 6
- Views: 667
Re: Trend for Polarizability
Think of polarizability as "How easily can this atom lose an electron". If it has high polarizability, it'll be really easy for it to lose an electron and vice versa. Bigger atoms have higher polarizability because the bigger an atom is, the more electrons they, and the more electrons they...
- Tue Nov 12, 2019 11:51 pm
- Forum: Dipole Moments
- Topic: 3F.5
- Replies: 6
- Views: 264
Re: 3F.5
Yeah, doesn't ether also have H bonds? They're bonded to the carbon just as in Butanol, so what's the difference? Is it because unlike in Ether, theres a carbon bonded to an Oxygen? If so, why is this important??
- Tue Nov 05, 2019 6:02 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizability Periodic Trend
- Replies: 5
- Views: 188
Re: Polarizability Periodic Trend
@ Maddie, smaller radius makes an electron more polarizable because when the electron is smaller, the valence electrons are closer to the nucleus- it's harder to take them away from the atom. It's easier to take them away from an atom with a big radius because the valence electrons are shielded from...
- Tue Nov 05, 2019 5:57 pm
- Forum: DeBroglie Equation
- Topic: Dino Nuggets 8C
- Replies: 2
- Views: 148
Re: Dino Nuggets 8C
oh my gosh you're right, thank you
- Tue Nov 05, 2019 5:30 pm
- Forum: DeBroglie Equation
- Topic: Dino Nuggets 8C
- Replies: 2
- Views: 148
Dino Nuggets 8C
The answer for 8B was 6.78x1014 Hz and the next questions asks if the students can see it. Answer key says yes but how is that possible if it doesn't fall under the visible region??
- Tue Nov 05, 2019 1:49 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing This Equation
- Replies: 11
- Views: 1193
Re: Balancing This Equation
Since its a combustion, wouldn't it be C10H14N2+ O2--> N2
- Tue Nov 05, 2019 1:48 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing This Equation
- Replies: 11
- Views: 1193
Balancing This Equation
Write a balanced combustion reaction for solid nicotine (C10H14N2). (Hint: The reaction produces N2 gas). How can we balance it when both sides don't have Oxygen? Or does it? How are we supposed to figure this out?
- Sun Nov 03, 2019 3:00 pm
- Forum: Octet Exceptions
- Topic: Expanded Orbitals Explain Pls
- Replies: 1
- Views: 107
Expanded Orbitals Explain Pls
When people ask how expanded octets happen, they keep saying that its because the p elements in the third period and on have a d orbital that can accommodate for more electrons. But I still don't understand why and how having a d orbital allows the 3p or higher elements to be able to accommodate mor...
- Sun Nov 03, 2019 2:54 pm
- Forum: Octet Exceptions
- Topic: Identifying Radicals
- Replies: 6
- Views: 420
Identifying Radicals
How do we know when a molecule is meant to be a radical? Can someone give an example other than CH3?? Thank you :(
Also, I understand how radicals are an exception to the octet rule, but is that all their importance is tied to? Why are they important to know??
Also, I understand how radicals are an exception to the octet rule, but is that all their importance is tied to? Why are they important to know??
- Sun Nov 03, 2019 1:35 am
- Forum: Lewis Structures
- Topic: Formal Charge for Lewis Structures
- Replies: 4
- Views: 281
Re: Formal Charge for Lewis Structures
Wait, when we get a bond with resonance, do we draw all the possible lewis structures AND their formal charges?? thats a lot haha
- Sun Nov 03, 2019 12:54 am
- Forum: Lewis Structures
- Topic: central atom
- Replies: 16
- Views: 2264
Re: central atom
This excerpt from the book helped me a bit figuring this out. "If there is doubt, a good rule of thumb for molecules other than compounds of hydrogen is to choose as the central atom the element with the lowest ionization energy. This arrangement often results in the lowest energy because an at...
- Mon Oct 28, 2019 11:09 pm
- Forum: Ionic & Covalent Bonds
- Topic: 2A.5
- Replies: 4
- Views: 187
Re: 2A.5
Do we always try to keep d full? When do we start taking away from d?
- Sat Oct 26, 2019 5:23 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Factors In Multi-Electron Energy
- Replies: 1
- Views: 168
Factors In Multi-Electron Energy
Just to be sure: The big factors that affect a multi-electron's energy to keep in mind are their n and l values (because of electron probability distribution), their effective nuclear charge, & "shielding"/penetration. Is there something else I should also take into account?
- Sat Oct 26, 2019 4:43 pm
- Forum: Trends in The Periodic Table
- Topic: Effective Nuclear Charge
- Replies: 2
- Views: 114
Re: Effective Nuclear Charge
If the equation is Zeff= Z-S, and s is the number of non-valence electrons, does that mean that s is basically just the atomic number minus the valence electrons?
so is zeff= atomic number- (atomic number-valence e)?
so is zeff= atomic number- (atomic number-valence e)?
- Sat Oct 26, 2019 3:43 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Assigning Orbitals to Elements
- Replies: 4
- Views: 213
Assigning Orbitals to Elements
How can we figure out which orbital corresponds to each element? Taking Sulfur, for example, which p orbital (px,py,pz) does it hold and how can we figure it out?
- Sat Oct 26, 2019 2:53 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Determining Element
- Replies: 4
- Views: 150
Determining Element
How do we determine an element from the quantum numbers? I mean, without knowing where the element is on the periodic table, we can't figure out ml, can't we? So, is it possible?
- Wed Oct 23, 2019 1:56 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: 1D.23
- Replies: 2
- Views: 208
Re: 1D.23
We focus on the l values here. For a, since l=1, that means ml can be -1,0, or 1. That's a total of three values, so it has 3 orbitals (this applies to c as well). However, I'm actually lost as how to solve b and d. Does the fact that we have an ml value change the number of orbitals, or does it sti...
- Sat Oct 19, 2019 9:53 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Inner e- and Outer e-
- Replies: 14
- Views: 534
Re: Inner e- and Outer e-
I understand the result from their position, but what does that have to do with anything? What does it affect??
- Sat Oct 19, 2019 9:34 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Letter Names
- Replies: 4
- Views: 163
Re: Letter Names
We use spdf in order to make up their orbital configurations.
- Sat Oct 19, 2019 9:31 pm
- Forum: Photoelectric Effect
- Topic: E = pc vs E= mv^2/2
- Replies: 2
- Views: 96
Re: E = pc vs E= mv^2/2
It al depends on the information you have before hand and what you're trying to find.
- Tue Oct 15, 2019 6:06 pm
- Forum: *Black Body Radiation
- Topic: What is Black Body?
- Replies: 53
- Views: 2585
Re: What is Black Body?
From my understanding, black bodies is a misleading name because they're actually glowing white from how hot they are. Basically, they do absorb all wavelengths, but they don't reflect light, they radiate it. The amount of light emitted then depends on the temperature of the object being heated.
- Tue Oct 15, 2019 6:00 pm
- Forum: DeBroglie Equation
- Topic: Given the energy, calculate the wavelength of y-rays
- Replies: 12
- Views: 3383
Re: Given the energy, calculate the wavelength of y-rays
He got the value c from the speed of light.
- Thu Oct 03, 2019 5:28 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Clarification for G17b ?
- Replies: 4
- Views: 156
Re: Clarification for G17b ?
Adding on to this question, why is there a dot between CuSo4 • 5H2O? What does it mean? Is it any different as to if they were completely together??
- Thu Oct 03, 2019 5:13 pm
- Forum: Limiting Reactant Calculations
- Topic: Limiting Reagent Ratios
- Replies: 4
- Views: 260
Re: Limiting Reagent Ratios
I've had that same problem! I know we have to compare the values to each other to see which is the limiting reactant and which is in excess, but I don't know how to do that when the numbers aren't as simple as a 1:2 ratio. But, I THINK that the way to do it is to multiply by the reciprocal of the ra...
- Thu Oct 03, 2019 3:54 pm
- Forum: SI Units, Unit Conversions
- Topic: Formula units vs molecule
- Replies: 7
- Views: 378
Re: Formula units vs molecule
This excerpt from the book cleared that up for me because I was stumped on the idea of formula units too. " e molar mass of an element is the mass per mole of its atoms. e molar mass of a molecular compound is the mass per mole of its molecules. e molar mass of an ionic compound is the mass per...