Search found 34 matches
- Thu Dec 06, 2018 2:14 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Defining Acids and Bases
- Replies: 1
- Views: 369
Re: Defining Acids and Bases
This video should help answer your question: https://www.youtube.com/watch?v=NNXvokAcSuE
- Thu Dec 06, 2018 2:12 pm
- Forum: Lewis Acids & Bases
- Topic: Resonance and acids
- Replies: 2
- Views: 518
Re: Resonance and acids
A molecule is said to have resonance when its structure cannot be adequately described by a single Lewis structure. Since a weaker base has a stronger conjugate acid, a compound whose conjugate base enjoys resonance stabilization will be more acidic.
- Thu Dec 06, 2018 2:10 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Water
- Replies: 2
- Views: 390
Re: Water
pH decreases with increase in temperature. But this does not mean that water becomes more acidic at higher temperatures. In the case of pure water, there are always the same concentration of hydrogen ions and hydroxide ions and hence, the water is still neutral (even if its pH changes)
- Thu Dec 06, 2018 2:09 pm
- Forum: Conjugate Acids & Bases
- Topic: Conjugate Acid/Base
- Replies: 3
- Views: 432
Re: Conjugate Acid/Base
A conjugate acid is formed by a proton (H+). A conjugate base is what is left over after an acid has donated a proton.
- Thu Dec 06, 2018 2:03 pm
- Forum: Calculating the pH of Salt Solutions
- Topic: how to determine pH of salt solutions easily
- Replies: 1
- Views: 580
Re: how to determine pH of salt solutions easily
This video helped me a lot. I would recommend it. https://www.youtube.com/watch?v=NNXvokAcSuE
Re: naming
Only use suffix -ate if the complex has a negative charge.
- Thu Dec 06, 2018 1:51 pm
- Forum: Naming
- Topic: Compound formula
- Replies: 1
- Views: 292
Re: Compound formula
[Mn(en)2I2]2+
- Thu Dec 06, 2018 1:47 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: number
- Replies: 1
- Views: 313
Re: number
The coordination is simply the amounts of ligands present. For example (NH3)5 ... The coordination number is 5. However if there are two ligands present then you will add those two together. For example [Co(NH3)4(F2)3 Then you would add the number of ligands and that would be your coordination numbe...
- Thu Dec 06, 2018 1:43 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Calculating pH
- Replies: 2
- Views: 325
Re: Calculating pH
You will need to know the molarity of the NaOH. Let's assume the solution is 0.1M. NaOH is a strong base, so this will produce 0.1mol/L of OH ions in solution. This will produce a pH of 13. You will need to take the negative log of 0.1 to find the pOH. This will work out to be 1. Since pH + pOH = 14...
- Wed Dec 05, 2018 7:57 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligands
- Replies: 1
- Views: 294
Re: Ligands
Ones to remember would be: NH3, CN, EN, and H2O. These are most used.
- Wed Dec 05, 2018 7:53 am
- Forum: Empirical & Molecular Formulas
- Topic: midterm question
- Replies: 3
- Views: 647
Re: midterm question
Well you're not really looking to balance the reaction on this problem. Its more of finding out how many atoms of each molecule (H, C, O) you have.
- Tue Dec 04, 2018 10:03 pm
- Forum: General Science Questions
- Topic: Can We Take The Final In Pencil?
- Replies: 14
- Views: 1631
Re: Can We Take The Final In Pencil?
I'm the same way and don't like using pens but what I do is do my work in the small space of a corner paper and once I get it down I just rewrite it bigger on the other corner. Hope this helps. (:
- Tue Dec 04, 2018 9:59 pm
- Forum: Lewis Structures
- Topic: Lewis Structure bonds
- Replies: 4
- Views: 440
Re: Lewis Structure bonds
It all depends on the formal charge. Remember that you add bonds + dots to figure out the formal charge.
- Tue Dec 04, 2018 9:57 pm
- Forum: Hybridization
- Topic: Double and Triple Bonds
- Replies: 17
- Views: 4338
Re: Double and Triple Bonds
No they do not. (single, double, triple) bonds are all the same value in hybridization
- Sun Dec 02, 2018 11:00 pm
- Forum: Bronsted Acids & Bases
- Topic: Questions
- Replies: 2
- Views: 447
Re: Questions
From the previous final exams I've seen, yes it does ask for characteristics. Just to be safe, I would recommend to memorize them regardless.
- Sun Dec 02, 2018 8:47 pm
- Forum: Naming
- Topic: Latin prefixes
- Replies: 3
- Views: 427
Re: Latin prefixes
Im not sure if we'll be tested on it but I would recommend you memorize them just in case.
- Sun Dec 02, 2018 8:40 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Question 17.33 (Sixth Edition)
- Replies: 1
- Views: 279
Re: Question 17.33 (Sixth Edition)
a) Tridentate ligand: This is because there are three Nitrogens in this structure that each have a lone pair. No other atoms have a lone pair. b) Mono or bidentate Ligand: This is because CO3 can bind to one or two oxygen atoms. c) Monodenate ligand: Even through oxygen has two lone pairs, the metal...
- Sun Dec 02, 2018 8:35 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: LDF
- Replies: 7
- Views: 1707
Re: LDF
Yes all molecules contain the intermolecular LDF.
- Sun Dec 02, 2018 8:32 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Thank you to Professor Lavelle
- Replies: 1
- Views: 305
Re: Thank you to Professor Lavelle
Thank you Dr. Lavelle for going out of your way for students. He goes above and beyond to see his students succeed, which is incredibly amazing. Thank you for making learning chemistry fun!
- Sun Dec 02, 2018 8:24 pm
- Forum: Hybridization
- Topic: lone pairs
- Replies: 20
- Views: 2139
Re: lone pairs
Yes the lone pairs are taken into consideration. The number of hybrid orbitals is equal to the number of regions around the atom.
- Sun Dec 02, 2018 8:22 pm
- Forum: Hybridization
- Topic: Double and Triple Bonds
- Replies: 17
- Views: 4338
Re: Double and Triple Bonds
No they do not. All bonds (single, double, triple) are considered as one bond. Hybridization is really more about regions of electrons.
- Sun Dec 02, 2018 8:20 pm
- Forum: Hybridization
- Topic: S Hybridization?
- Replies: 5
- Views: 501
Re: S Hybridization?
Shundeen Martinez 1D wrote:Can something just have a hybridization of s if it only is connected to one region of electron density?
Yes it's possible to have a hybridization of only s.
- Sat Nov 24, 2018 5:08 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: double and triple bonds
- Replies: 10
- Views: 1136
Re: double and triple bonds
Single, double and triple bonds are all one electron density.
- Sat Nov 24, 2018 4:55 pm
- Forum: Hybridization
- Topic: Steps to figure out hybridization
- Replies: 3
- Views: 504
Re: Steps to figure out hybridization
This video should help answer your question: https://www.youtube.com/watch?v=4xl0BD-tMeA
- Sat Nov 24, 2018 4:42 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond angles
- Replies: 2
- Views: 275
Re: Bond angles
Basically, whenever there is a lone pair on top, that means they will push down on the bonds, causing them to have an angle less than 109.5.
- Sat Nov 24, 2018 4:39 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Incomplete octet
- Replies: 2
- Views: 284
Re: Incomplete octet
The common examples of such elements are hydrogen (stable with only 2 valence electrons), beryllium (stable with only 4 valence electrons) and boron and aluminum (stable with only 6 valence electrons).
- Sun Nov 11, 2018 4:47 pm
- Forum: Dipole Moments
- Topic: Solubility in Water
- Replies: 5
- Views: 1877
Re: Solubility in Water
505168807 wrote:Would it also be correct to say that the more polar a molecule is, the more soluble it is?
Yes because polar molecules do dissolve in water as they form hydrogen bonds.
- Sun Nov 11, 2018 4:45 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Acid vs base [ENDORSED]
- Replies: 15
- Views: 1572
Re: Acid vs base [ENDORSED]
Roni Touboul wrote:Whats the difference between a Lewis acid and Lewis base?
Lewis Acid: a species that accepts an electron pair and will have vacant orbitals
Lewis Base: a species that donates an electron pair and will have lone-pair electrons
- Sat Nov 10, 2018 4:22 pm
- Forum: Dipole Moments
- Topic: VSPER
- Replies: 8
- Views: 970
Re: VSPER
What is VSPER? What do you use it for? The VSEPR theory, sometimes pronounced 'vesper', stands for Valence Shell Electron Pair Repulsion. It states that repulsion between the sets of electron bond pairs surrounding an atom in a compound causes these sets to be oriented as far apart as possible, giv...
- Sun Nov 04, 2018 2:24 pm
- Forum: Resonance Structures
- Topic: Resonance Structures on the Midterm
- Replies: 3
- Views: 343
Re: Resonance Structures on the Midterm
905085650 wrote:When we draw Lewis structures on the midterm, do we have to draw all resonance structures or just give one structure that works? Thank you!!
I've looked at a few past midterms and they usually state if they want all resonance or just one structure.
- Sun Nov 04, 2018 2:20 pm
- Forum: Trends in The Periodic Table
- Topic: 2.37 (c)
- Replies: 1
- Views: 142
Re: 2.37 (c)
Hi! I am bit confused on why the statement below is false, if someone could clarify this for me thank you! (c) Electrons having l =2 are better at shielding than electrons having l = 1. The higher the value for l, the higher the orbital is, so it's further away from the nucleus. When l=1, an electr...
- Sun Nov 04, 2018 2:16 pm
- Forum: Trends in The Periodic Table
- Topic: Exceptions to Electron Affinity
- Replies: 1
- Views: 229
Re: Exceptions to Electron Affinity
Hi, I was wondering what were the exceptions to electron affinity that we had to know? This exception rule is actually orbital filling rule. For two electrons to be in same orbital they need to have different spins (Pauli exclusion principal). This electron pairing requires additional energy and th...
- Sun Nov 04, 2018 2:09 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Degeneracy
- Replies: 6
- Views: 712
Re: Degeneracy
what does degeneracy mean and how do we determine it for orbitals? Also when do we use orbital, shell, and subshell, I find myself using these words interchangeably. Degeneracy basically means of which orbital.bThe degeneracy of s=1, p=3, d=5, f=7 Think of it this way: Shell is n, subshell is l (in...
- Sun Oct 28, 2018 9:58 pm
- Forum: Electronegativity
- Topic: Electronegativity vs Electron Affinity
- Replies: 4
- Views: 37129
Re: Electronegativity vs Electron Affinity
Could someone please explain what the difference is between electronegativity and electron affinity. In lecture they seemed like the same thing and they seem to have the same trends on the periodic table. Can these terms be used interchangeably? The difference between the two is that electronegativ...