Search found 35 matches
- Sun Jun 10, 2018 6:16 pm
- Forum: Conjugate Acids & Bases
- Topic: Conjugate Acids/Bases
- Replies: 8
- Views: 1253
Re: Conjugate Acids/Bases
The way I like to think about it is that in the reactants side of a chemical reaction, the acid is what gives it's H+away and the base is what will receive the H+. Though on the products side, it's the product that receives the H+ that is the conjugate acid ( it would have been the base on the reac...
- Sun Jun 10, 2018 6:13 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Acid Strength
- Replies: 5
- Views: 3055
Re: Acid Strength
Chloe Blume 1F wrote:How can you determine what is a strong acid vs a weak acid?
I wonder the same thing, but I've heard one should focus on the conjugate base. The more stable base has the stronger acid.
- Sun Jun 10, 2018 6:10 pm
- Forum: Lewis Acids & Bases
- Topic: Strength [ENDORSED]
- Replies: 5
- Views: 1177
Re: Strength [ENDORSED]
As stated above, the conjugate base is a good indicator: the more stable it is, the more strong the acid is.
- Sun Jun 03, 2018 5:18 pm
- Forum: Biological Examples
- Topic: Hemoglobin
- Replies: 5
- Views: 1063
Re: Hemoglobin
Clement is correct. It should be Myoglobin and Iron (Fe), respectively.
- Sun Jun 03, 2018 5:16 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Bond types
- Replies: 6
- Views: 723
Re: Bond types
They're used to help portray a 3-D figure without having to draw one out with depth.
- Sun Jun 03, 2018 5:14 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligands
- Replies: 8
- Views: 1344
Re: Ligands
Ligands must at least have one lone pair to donate to the central atom (hence creating a coordination between the two atoms).
- Sun Jun 03, 2018 5:12 pm
- Forum: Naming
- Topic: Coordination compound
- Replies: 6
- Views: 923
Re: Coordination compound
Hope_Pham_1G wrote:Are ligands always nonmetal atoms?
As far as I've learned, they are. But there could be exceptions? (I could be wrong, but I've also encountered only nonmetal atoms)
- Sun Jun 03, 2018 5:12 pm
- Forum: Naming
- Topic: Coordination compound
- Replies: 6
- Views: 923
Re: Coordination compound
Hope_Pham_1G wrote:Are ligands always nonmetal atoms?
As far as I've learned, they are. But there could be exceptions? (I could be wrong, but I've also encountered only nonmetal atoms)
- Sun May 27, 2018 7:40 pm
- Forum: Resonance Structures
- Topic: Bonds or Lone Pairs more important?
- Replies: 7
- Views: 1127
Re: Bonds or Lone Pairs more important?
They are both equally important. This is because each contributes their respective characteristics to an atom.
- Sun May 27, 2018 7:36 pm
- Forum: Resonance Structures
- Topic: ranking
- Replies: 11
- Views: 1536
Re: ranking
Calculate formal charge and try your best to have to be as close to 0 as possible.
- Sun May 27, 2018 7:35 pm
- Forum: Resonance Structures
- Topic: Clarifying wording
- Replies: 2
- Views: 559
Re: Clarifying wording
MeghetyManoyan1A wrote:Yes, it refers to the most plausible resonance structure, which has the lowest formal charge/is the most stable.
Maghety is correct. This means to search for the structure with the lowest formal charge.
- Sun May 20, 2018 4:52 pm
- Forum: Lewis Structures
- Topic: Dots vs lines to represent electrons
- Replies: 8
- Views: 1982
Re: Dots vs lines to represent electrons
I've seen both cases in which problems used lines and dots, respectively. It is recommended, however, to use lines so as to easily identify bonds and to make it look more organized than to stack dots on top of each other.
- Sun May 20, 2018 4:49 pm
- Forum: Lewis Structures
- Topic: Test #3
- Replies: 11
- Views: 1381
Re: Test #3
ElizabethP1L wrote:Will we have to use significant figures for this test just like midterm?
It's best to keep your sig figs consistent. So, yes: I would recommend using the correct number of sig figs (if not required, it's good practice).
- Sun May 20, 2018 4:47 pm
- Forum: Resonance Structures
- Topic: Bonds or Lone Pairs more important?
- Replies: 7
- Views: 1127
Re: Bonds or Lone Pairs more important?
I agree with Heung. There is no particular rule to follow if double bonds are prioritized over lone pairs. It's a matter of minimizing the formal charge, but also taking into consideration the capabilities (bond-wise) of a given atom.
- Sun May 13, 2018 8:29 pm
- Forum: Lewis Structures
- Topic: Best way to start Lewis Structures
- Replies: 12
- Views: 1286
Re: Best way to start Lewis Structures
Figure out how many valence electrons that the given elements have. The central atom is usually the one with the smallest ionization energy (know the periodic trend!) and then figure out how many electrons need to be shared to achieve an octet. Use double bonds, etc. accordingly to avoid having exce...
- Sun May 13, 2018 8:26 pm
- Forum: Lewis Structures
- Topic: Ionic vs Covalent
- Replies: 5
- Views: 758
Re: Ionic vs Covalent
Patience is right. Covalent bonds don't involve metals, while ionic bonds include one non-metal and a metal.
- Sun May 13, 2018 8:24 pm
- Forum: Lewis Structures
- Topic: Order of Dots
- Replies: 11
- Views: 1278
Re: Order of Dots
There isn't a specific way to draw the dots. I thought so myself, but it's best to just draw them out (in no particular order) and see which are unpaired /paired! From there, you can determine what bonds to draw.
- Sun May 06, 2018 11:05 pm
- Forum: Trends in The Periodic Table
- Topic: Trends to Know
- Replies: 12
- Views: 1382
Re: Trends to Know
Professor Lavelle said to only worry about Chapter 1, 2, and the Fundamentals. Best to review Outline 1 & 2!
- Sun May 06, 2018 10:55 pm
- Forum: Ionic & Covalent Bonds
- Topic: Types of Bonds
- Replies: 10
- Views: 1271
Re: Types of Bonds
It's dependent on the relationship between the two elements: if they are two non-metals, it is covalent. If only one is non-metal while the other is metal, it is ionic.
- Sun May 06, 2018 10:53 pm
- Forum: Ionic & Covalent Bonds
- Topic: cation vs anion
- Replies: 14
- Views: 3743
Re: cation vs anion
Anions are negatively-charged, while cations are positively-charged. The way I remember it is that "cations" has a "t" just like in positivi-T!
- Sat Apr 28, 2018 8:17 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Which Equation Do We Never Use for Light? [ENDORSED]
- Replies: 3
- Views: 591
Re: Which Equation Do We Never Use for Light? [ENDORSED]
Lavelle said not to use the deBroglie Equation in regards to light.
- Sat Apr 28, 2018 8:11 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg [ENDORSED]
- Replies: 5
- Views: 795
Re: Rydberg [ENDORSED]
Prediction of wavelength when the electron is moving between energy levels.
- Sat Apr 28, 2018 8:08 pm
- Forum: DeBroglie Equation
- Topic: does everything have a wavelength
- Replies: 10
- Views: 1561
Re: does everything have a wavelength
A good rule of thumb for myself is that anything that has a given mass will have a wavelength. So, yes; but of course, there may be certain exceptions somewhere down the line.
- Sun Apr 22, 2018 9:47 pm
- Forum: Einstein Equation
- Topic: Combining E=hv and c=ƛv [ENDORSED]
- Replies: 7
- Views: 5406
Re: Combining E=hv and c=ƛv [ENDORSED]
First, you solve for v in the second equation, then plug that into E=hv.
- Sun Apr 22, 2018 9:43 pm
- Forum: DeBroglie Equation
- Topic: Wavelength and De Broglie Equation [ENDORSED]
- Replies: 9
- Views: 1053
Re: Wavelength and De Broglie Equation [ENDORSED]
Avoid using De Broglie when it comes to light, only when mass comes up.
- Sun Apr 22, 2018 9:21 pm
- Forum: Properties of Light
- Topic: frequency and wavelength [ENDORSED]
- Replies: 5
- Views: 1511
Re: frequency and wavelength [ENDORSED]
Frequency and Wavelength have an inverse relationship: the higher the frequency, the shorter the wavelength; the shorter the frequency, the longer the wavelength.
- Sun Apr 15, 2018 10:28 pm
- Forum: Empirical & Molecular Formulas
- Topic: Rounding atomic weight (general question) [ENDORSED]
- Replies: 8
- Views: 1091
Re: Rounding atomic weight (general question) [ENDORSED]
Personally, I just follow the periodic table, no matter how tedious it may be to spell out the entire number, just to be safe. You could just save the rounding for the end, while also attaching a solution that isn't rounded possibly.
- Sun Apr 15, 2018 10:26 pm
- Forum: Empirical & Molecular Formulas
- Topic: Molecular to Empirical
- Replies: 9
- Views: 1193
Re: Molecular to Empirical
It would remain the same. Changing it like that would translate a different structure.
- Sun Apr 15, 2018 10:24 pm
- Forum: SI Units, Unit Conversions
- Topic: Correct Units?? [ENDORSED]
- Replies: 8
- Views: 924
Re: Correct Units?? [ENDORSED]
It was recommended by my previous TA to just go off of what the problem begins with unless stated otherwise. For instance, if they give you grams for any part of the problem, your result should reflect grams.
- Sun Apr 15, 2018 10:22 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Mass percentage
- Replies: 8
- Views: 1055
Re: Mass percentage
There should be no loss of mass, as stated in the law of conservation of mass. If there were a case in which it does not add up to 100%, for instance, combustion, then it's safe to assume the missing portion is oxygen.
- Sun Apr 15, 2018 10:19 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing equations with fractions [ENDORSED]
- Replies: 13
- Views: 1653
Re: Balancing equations with fractions [ENDORSED]
It's bad style (actually, even looked down upon by scholars) to be leaving fractions in the equation. Multiply both sides by whatever number, in this case, the number 2, and leave whole numbers.
- Sun Apr 15, 2018 10:16 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Accuracy vs Precision
- Replies: 23
- Views: 2747
Re: Accuracy vs Precision
Essentially accuracy is how close you are to the actual result, as precision is how close your results are in respect to one another.
- Sun Apr 15, 2018 10:12 pm
- Forum: Significant Figures
- Topic: Why are sig figs important?
- Replies: 13
- Views: 16242
Re: Why are sig figs important?
I also approached one of the TA's in a previous Chem class that I was enrolled in; it was said the SIg figs aid in how precise AND accurate our results will be. If we are inconsistent with the number of sig figs, that data that is calculated will end up being completely different from the actual sol...
- Sun Nov 29, 2015 5:47 pm
- Forum: Student Social/Study Group
- Topic: CHEM 14A VIDEO: Coordination Compounds (Repost)
- Replies: 2
- Views: 821
CHEM 14A VIDEO: Coordination Compounds (Repost)
REPOST:
Nathan Cai (1G), George Faor (1K), Rummel Requerme (1F)
What are coordination compounds? How do we name them?
Original upload: Thursday November 25, 2015
Nathan Cai (1G), George Faor (1K), Rummel Requerme (1F)
What are coordination compounds? How do we name them?
Original upload: Thursday November 25, 2015
- Thu Nov 26, 2015 12:13 pm
- Forum: Naming
- Topic: CHEM 14A VIDEO: Coordination Compounds
- Replies: 1
- Views: 302
CHEM 14A VIDEO: Coordination Compounds
https://www.youtube.com/watch?v=U4m9kE7hKnA&feature=youtu.be
Nathan Cai (1G), George Faor (1K), Rummel Requerme (1F)
What are Coordination Compounds? How do we name them?
Nathan Cai (1G), George Faor (1K), Rummel Requerme (1F)
What are Coordination Compounds? How do we name them?