Search found 50 matches
- Fri Dec 06, 2019 11:14 pm
- Forum: Ionic & Covalent Bonds
- Topic: intermolecular vs intramolecular
- Replies: 17
- Views: 1868
Re: intermolecular vs intramolecular
Intermolecular bonding is between multiple molecules. Intramolecular bonding is within a single molecule.
- Fri Dec 06, 2019 11:03 pm
- Forum: Conjugate Acids & Bases
- Topic: Oxoacids
- Replies: 4
- Views: 448
Re: Oxoacids
An oxyacid is an acid that contains oxygen and contains at least one other element. It also has at least one hydrogen atom bonded to oxygen.
- Fri Dec 06, 2019 11:02 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: what is a ligand?
- Replies: 7
- Views: 506
Re: what is a ligand?
A ligand is an ion or molecule attached to a metal atom and donates electrons.
- Fri Dec 06, 2019 10:59 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Weak vs Strong acids and bases
- Replies: 6
- Views: 451
Re: Weak vs Strong acids and bases
A strong base would have a higher pH due to it accepting more protons. A weak base would have a lower pH.
- Fri Dec 06, 2019 10:57 pm
- Forum: Polyprotic Acids & Bases
- Topic: Definition of Polyprotic
- Replies: 5
- Views: 589
Re: Definition of Polyprotic
A polyprotic acid can donate more than one proton. A polyprotic base can accept more than one proton.
- Tue Dec 03, 2019 1:09 pm
- Forum: Octet Exceptions
- Topic: 2.27
- Replies: 7
- Views: 651
Re: 2.27
Yes. There are only radicals when there is an odd number of electrons.
- Tue Dec 03, 2019 1:05 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Studying for the Final [ENDORSED]
- Replies: 11
- Views: 710
Re: Studying for the Final [ENDORSED]
I would suggest going to the student activities center and trading in your old test for other classes and seeing if there are any old finals for 14a!
- Tue Dec 03, 2019 1:05 pm
- Forum: Electronegativity
- Topic: Electronegativity
- Replies: 16
- Views: 989
Re: Electronegativity
If the electronegativity is higher, the bond is stronger. It also means the bond is shorter.
- Tue Dec 03, 2019 1:04 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Oxalate and CO3 2- as a polydentate
- Replies: 3
- Views: 299
Re: Oxalate and CO3 2- as a polydentate
I think it would always be the single bonded ones due to the absense of the pi bond but I am not too sure
- Tue Dec 03, 2019 1:02 pm
- Forum: Dipole Moments
- Topic: Hydrogen Bonding
- Replies: 20
- Views: 1112
Re: Hydrogen Bonding
Yes. These are the only atoms that can make a hydrogen bond. Hydrogen can make other bonds with other atoms.
- Tue Dec 03, 2019 1:01 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: pKa vs Ka
- Replies: 6
- Views: 440
Re: pKa vs Ka
Okay I talked to someone about this question and I also found out that pKa is preferred it is the log version of the number and therefore easier to compare and use rather than the scientific powers of Ka
- Tue Dec 03, 2019 12:58 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Value of Kw?
- Replies: 4
- Views: 557
Re: Value of Kw?
Yes. This is the constant value that should always be used.
- Tue Dec 03, 2019 12:57 pm
- Forum: Polyprotic Acids & Bases
- Topic: Why is HClO4 stronger than H3PO4?
- Replies: 3
- Views: 1202
Re: Why is HClO4 stronger than H3PO4?
Chlorine has a higher electronegativity than phosphorus, so it pulls the oxygen atom electrons towards itself with greater force than phosphorus. The fact that chlorine has a higher pull means that oxygen electrons become less accessible for the hydrogen atoms to "share", making it less fa...
- Tue Dec 03, 2019 12:54 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization Energy
- Replies: 7
- Views: 515
Re: Ionization Energy
the second ionization energy of Mg is larger than the first because it takes more energy to remove an electron from a positively charged ion than from a neutral atom
- Tue Dec 03, 2019 12:54 pm
- Forum: Hybridization
- Topic: Conceptual meaning of hybridization
- Replies: 3
- Views: 217
Conceptual meaning of hybridization
What happens in hybridization? Like why does it happen? Does it lower the energy of the molecule?
- Tue Dec 03, 2019 12:53 pm
- Forum: Trends in The Periodic Table
- Topic: Shielding
- Replies: 8
- Views: 539
Re: Shielding
Shielding electrons are the electrons in the energy levels between the nucleus and the valence electrons
- Tue Dec 03, 2019 12:50 pm
- Forum: Trends in The Periodic Table
- Topic: Question
- Replies: 17
- Views: 1315
Re: Question
Electronegativity is how much an atom attracts electrons. Ionization energy is needed to remove electrons from atoms.
- Tue Dec 03, 2019 12:50 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Where to minimize formal charge
- Replies: 4
- Views: 391
Where to minimize formal charge
Is there a specific atom in a molecule that we should try and get to have a 0 formal charge? If there is a charge we can't avoid where should we put it
- Tue Dec 03, 2019 12:48 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Resonance and Formal Charge
- Replies: 4
- Views: 360
Resonance and Formal Charge
Why do different resonance structures have different formal charges and how do we know which is the major contributor.
- Tue Dec 03, 2019 12:47 pm
- Forum: Lewis Acids & Bases
- Topic: diff b/w lewis acid and base
- Replies: 12
- Views: 651
Re: diff b/w lewis acid and base
Lewis acids accept electrons while bases donate electrons. Acids are more positive and bases are more negative.
- Tue Dec 03, 2019 12:46 pm
- Forum: Hybridization
- Topic: Conjugation and hybridization
- Replies: 1
- Views: 227
Conjugation and hybridization
Hey, could someone please explain to me how conjugation affects hybridization and if we will have to use this concept explicitly.
- Tue Dec 03, 2019 12:45 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: Does dipole-dipole force only exist among polar molecules?
- Replies: 9
- Views: 1226
Re: Does dipole-dipole force only exist among polar molecules?
Yes due to the partial charges. Nonpolar molecules can have temporary dipoles.
- Tue Dec 03, 2019 12:40 pm
- Forum: Hybridization
- Topic: Triple Bond Hybridization
- Replies: 4
- Views: 171
Triple Bond Hybridization
Hello! Could someone explain why a triple bond has a hybridization of sp
- Tue Dec 03, 2019 12:37 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: dipole dipole
- Replies: 7
- Views: 392
Re: dipole dipole
Yes. Both of the molecules have to be polar. The partial charges created by the dipoles makes it polar.
- Tue Dec 03, 2019 12:34 pm
- Forum: Bond Lengths & Energies
- Topic: conjugation
- Replies: 3
- Views: 318
conjugation
How does the conjugation of a molecule affect its energy and bond lengths
- Tue Dec 03, 2019 12:33 pm
- Forum: Bond Lengths & Energies
- Topic: Pi and Sigma Bonds and their affect on energy
- Replies: 3
- Views: 380
Pi and Sigma Bonds and their affect on energy
Will someone please explain how pi bonds and their p orbitals cause a lower energy state
- Tue Dec 03, 2019 12:29 pm
- Forum: Sigma & Pi Bonds
- Topic: Molecular Shape
- Replies: 11
- Views: 684
Re: Molecular Shape
No but they determine whether or not the bond is able to rotate.
- Tue Dec 03, 2019 12:27 pm
- Forum: Dipole Moments
- Topic: Melting points
- Replies: 15
- Views: 1269
Re: Melting points
A double bond does not affect the melting point. The intermolecular force is what affects the melting point.
- Tue Dec 03, 2019 12:27 pm
- Forum: Sigma & Pi Bonds
- Topic: Orbitals and sigma/pi bonds
- Replies: 2
- Views: 127
Re: Orbitals and sigma/pi bonds
So basically pi bonds are formed because the side-by-side overlap of p orbitals leads to a lower-energy state than if there were no overlap so it depends on the valence electrons of the atoms and the energy state certain bonds create
- Tue Dec 03, 2019 12:22 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: pKa vs Ka
- Replies: 6
- Views: 440
pKa vs Ka
Why is pKa preffered over Ka?
- Tue Dec 03, 2019 12:20 pm
- Forum: Dipole Moments
- Topic: dipole moments
- Replies: 6
- Views: 392
Re: dipole moments
By definition Molecules that contain dipoles are called polar molecules, so yes the two can't be separated.
- Tue Dec 03, 2019 12:17 pm
- Forum: Lewis Acids & Bases
- Topic: Oxoacids
- Replies: 6
- Views: 399
Re: Oxoacids
it is a compound that contains hydrogen, oxygen, and at least one other element, with at least one hydrogen atom bond to oxygen that can dissociate to produce the H⁺ cation and the anion of the acid
- Tue Dec 03, 2019 12:16 pm
- Forum: Dipole Moments
- Topic: dipole moments
- Replies: 6
- Views: 392
Re: dipole moments
Yes. Polar molecules have a permanent dipole moment. Nonpolar molecules can have dipole moments that cancel each other out.
- Tue Dec 03, 2019 12:12 pm
- Forum: Properties & Structures of Inorganic & Organic Bases
- Topic: Stronger Acid 6C.21
- Replies: 3
- Views: 230
Re: Stronger Acid 6C.21
Out of acetic acid and formic acid, formic acid is considered stronger because the CH3 in acetic acid is electron donating. The CH3 actually contributes electron density towards the O-H bond, making it harder to remove the H, and making acetic acid a weaker acid than formic acid
- Tue Dec 03, 2019 12:10 pm
- Forum: General Science Questions
- Topic: Exam Subjects
- Replies: 5
- Views: 491
Re: Exam Subjects
I think the exam will consist of problems that incorporate topics we have learned throughout the year with an emphasis on later topics that weren't included on our last test!
- Tue Dec 03, 2019 12:09 pm
- Forum: *Particle in a Box
- Topic: Hydrogen Atom
- Replies: 7
- Views: 1036
Re: Hydrogen Atom
the change in energy of a hydrogen atom is positive
- Tue Dec 03, 2019 12:07 pm
- Forum: Ionic & Covalent Bonds
- Topic: ligands
- Replies: 7
- Views: 1645
Re: ligands
Ligands are ions or neutral molecules that bond to a central metal atom or ion. Ligands act as Lewis bases (electron pair donors), and the central atom acts as a Lewis acid (electron pair acceptor).
- Tue Dec 03, 2019 12:07 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination Number
- Replies: 6
- Views: 176
Re: Coordination Number
Your best bet is to identify the central atom in the chemical formula (usually a transition metal) and then adding the number of atoms of the nearest atom/molecule/ions connected to it
- Tue Dec 03, 2019 12:04 pm
- Forum: Lewis Acids & Bases
- Topic: Bronsted v Lewis acids and bases
- Replies: 1
- Views: 163
Re: Bronsted v Lewis acids and bases
The Lewis definition encompasses the bronsted defintion. Lewis acids can accept an electron pair, while Lewis bases can donate an electron pair where a Bronsted-Lowry acid is defined as a substance that gives up or donates hydrogen ions
- Tue Dec 03, 2019 12:04 pm
- Forum: Lewis Acids & Bases
- Topic: Definition
- Replies: 7
- Views: 529
Re: Definition
A Lewis acid is an electron-pair acceptor. A Lewis base is an electron-pair donor.
- Tue Dec 03, 2019 12:03 pm
- Forum: Lewis Acids & Bases
- Topic: Oxoacids
- Replies: 6
- Views: 399
Re: Oxoacids
An oxyacid is an acid that contains an oxygen atom bonded to a hydrogen atom and at least one other element
- Tue Dec 03, 2019 12:02 pm
- Forum: Industrial Examples
- Topic: Bond rotations
- Replies: 10
- Views: 1760
Re: Bond rotations
When one or more lewis diagram can be drawn, the molecule is said to have resonance. Resonance isn't about the rotation of bonds, but about the delocalization of electrons that contribute to the overall structure. The idea that resonances rotate isn't really valid.
- Tue Dec 03, 2019 11:59 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentates
- Replies: 9
- Views: 657
Re: Polydentates
You know that a ligand is a polydentate if it can bond to a central metal atom in more than one coordinate bonding cites.
- Tue Dec 03, 2019 11:36 am
- Forum: Naming
- Topic: Naming Coordination Compounds
- Replies: 5
- Views: 244
Re: Naming Coordination Compounds
No! You do not need to memorize them, but I would be familiarize yourself with when we use them!
- Tue Dec 03, 2019 11:35 am
- Forum: Properties & Structures of Inorganic & Organic Bases
- Topic: Which is the stronger acid?
- Replies: 9
- Views: 919
Re: Which is the stronger acid?
In both molecules the oxygens are bonded to the chlorine but not to the hydrogen and thus draw the electrons in the O—H bond towards the chlorine and the oxygen, making the O—H bond more polar. This effects chloric acid more than chlorous acid, since the hydrogen will more readily dissociate in a mo...
- Tue Dec 03, 2019 11:27 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Chelating Complex
- Replies: 3
- Views: 173
Re: Chelating Complex
Chelation is a type of bonding of ions and molecules to metal ions so look for a central metal atom
- Tue Dec 03, 2019 11:20 am
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Periodic Trends
- Replies: 8
- Views: 652
Re: Periodic Trends
Polarizability increases down a group because atomic size increases and larger electron clouds distort more easily. Polarizability decreases across a period because of increasing nuclear charge
- Wed Nov 27, 2019 11:59 pm
- Forum: Student Social/Study Group
- Topic: HW Week 9 & 10
- Replies: 4
- Views: 243
Re: HW Week 9 & 10
I think week 9 should be on Coordination Compounds and their Biological Importance and week 10 should be on Acid and Base Structures and Properties.
- Sun Nov 24, 2019 6:27 pm
- Forum: Ionic & Covalent Bonds
- Topic: Hydrogen Bond Sites
- Replies: 5
- Views: 379
Re: Hydrogen Bond Sites
Any bond with a Hydrogen and a N, O, or F
- Sun Nov 17, 2019 10:23 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR shapes
- Replies: 3
- Views: 148
VSEPR shapes
Are the VSEPR shapes that we need to know linear, trigonal planar, tetrahedral, trigonal bypyramidal, and octahedral? Are there any others we should know?