Search found 35 matches

by Rummel Requerme 1E
Sun Jun 10, 2018 6:16 pm
Forum: Conjugate Acids & Bases
Topic: Conjugate Acids/Bases
Replies: 8
Views: 398

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...
by Rummel Requerme 1E
Sun Jun 10, 2018 6:13 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acid Strength
Replies: 5
Views: 404

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.
by Rummel Requerme 1E
Sun Jun 10, 2018 6:10 pm
Forum: Lewis Acids & Bases
Topic: Strength [ENDORSED]
Replies: 5
Views: 506

Re: Strength [ENDORSED]

As stated above, the conjugate base is a good indicator: the more stable it is, the more strong the acid is.
by Rummel Requerme 1E
Sun Jun 03, 2018 5:18 pm
Forum: Biological Examples
Topic: Hemoglobin
Replies: 5
Views: 528

Re: Hemoglobin

Clement is correct. It should be Myoglobin and Iron (Fe), respectively.
by Rummel Requerme 1E
Sun Jun 03, 2018 5:16 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Bond types
Replies: 6
Views: 178

Re: Bond types

They're used to help portray a 3-D figure without having to draw one out with depth.
by Rummel Requerme 1E
Sun Jun 03, 2018 5:14 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands
Replies: 8
Views: 279

Re: Ligands

Ligands must at least have one lone pair to donate to the central atom (hence creating a coordination between the two atoms).
by Rummel Requerme 1E
Sun Jun 03, 2018 5:12 pm
Forum: Naming
Topic: Coordination compound
Replies: 6
Views: 297

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)
by Rummel Requerme 1E
Sun Jun 03, 2018 5:12 pm
Forum: Naming
Topic: Coordination compound
Replies: 6
Views: 297

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)
by Rummel Requerme 1E
Sun May 27, 2018 7:40 pm
Forum: Resonance Structures
Topic: Bonds or Lone Pairs more important?
Replies: 7
Views: 442

Re: Bonds or Lone Pairs more important?

They are both equally important. This is because each contributes their respective characteristics to an atom.
by Rummel Requerme 1E
Sun May 27, 2018 7:36 pm
Forum: Resonance Structures
Topic: ranking
Replies: 11
Views: 488

Re: ranking

Calculate formal charge and try your best to have to be as close to 0 as possible.
by Rummel Requerme 1E
Sun May 27, 2018 7:35 pm
Forum: Resonance Structures
Topic: Clarifying wording
Replies: 2
Views: 250

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.
by Rummel Requerme 1E
Sun May 20, 2018 4:52 pm
Forum: Lewis Structures
Topic: Dots vs lines to represent electrons
Replies: 8
Views: 282

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.
by Rummel Requerme 1E
Sun May 20, 2018 4:49 pm
Forum: Lewis Structures
Topic: Test #3
Replies: 11
Views: 377

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).
by Rummel Requerme 1E
Sun May 20, 2018 4:47 pm
Forum: Resonance Structures
Topic: Bonds or Lone Pairs more important?
Replies: 7
Views: 442

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.
by Rummel Requerme 1E
Sun May 13, 2018 8:29 pm
Forum: Lewis Structures
Topic: Best way to start Lewis Structures
Replies: 12
Views: 507

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...
by Rummel Requerme 1E
Sun May 13, 2018 8:26 pm
Forum: Lewis Structures
Topic: Ionic vs Covalent
Replies: 5
Views: 198

Re: Ionic vs Covalent

Patience is right. Covalent bonds don't involve metals, while ionic bonds include one non-metal and a metal.
by Rummel Requerme 1E
Sun May 13, 2018 8:24 pm
Forum: Lewis Structures
Topic: Order of Dots
Replies: 11
Views: 406

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.
by Rummel Requerme 1E
Sun May 06, 2018 11:05 pm
Forum: Trends in The Periodic Table
Topic: Trends to Know
Replies: 12
Views: 483

Re: Trends to Know

Professor Lavelle said to only worry about Chapter 1, 2, and the Fundamentals. Best to review Outline 1 & 2!
by Rummel Requerme 1E
Sun May 06, 2018 10:55 pm
Forum: Ionic & Covalent Bonds
Topic: Types of Bonds
Replies: 10
Views: 375

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.
by Rummel Requerme 1E
Sun May 06, 2018 10:53 pm
Forum: Ionic & Covalent Bonds
Topic: cation vs anion
Replies: 14
Views: 459

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!
by Rummel Requerme 1E
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: 189

Re: Which Equation Do We Never Use for Light? [ENDORSED]

Lavelle said not to use the deBroglie Equation in regards to light.
by Rummel Requerme 1E
Sat Apr 28, 2018 8:11 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg [ENDORSED]
Replies: 5
Views: 241

Re: Rydberg [ENDORSED]

Prediction of wavelength when the electron is moving between energy levels.
by Rummel Requerme 1E
Sat Apr 28, 2018 8:08 pm
Forum: DeBroglie Equation
Topic: does everything have a wavelength
Replies: 10
Views: 372

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.
by Rummel Requerme 1E
Sun Apr 22, 2018 9:47 pm
Forum: Einstein Equation
Topic: Combining E=hv and c=ƛv [ENDORSED]
Replies: 7
Views: 322

Re: Combining E=hv and c=ƛv [ENDORSED]

First, you solve for v in the second equation, then plug that into E=hv.
by Rummel Requerme 1E
Sun Apr 22, 2018 9:43 pm
Forum: DeBroglie Equation
Topic: Wavelength and De Broglie Equation [ENDORSED]
Replies: 9
Views: 286

Re: Wavelength and De Broglie Equation [ENDORSED]

Avoid using De Broglie when it comes to light, only when mass comes up.
by Rummel Requerme 1E
Sun Apr 22, 2018 9:21 pm
Forum: Properties of Light
Topic: frequency and wavelength [ENDORSED]
Replies: 5
Views: 209

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.
by Rummel Requerme 1E
Sun Apr 15, 2018 10:28 pm
Forum: Empirical & Molecular Formulas
Topic: Rounding atomic weight (general question) [ENDORSED]
Replies: 8
Views: 380

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.
by Rummel Requerme 1E
Sun Apr 15, 2018 10:26 pm
Forum: Empirical & Molecular Formulas
Topic: Molecular to Empirical
Replies: 9
Views: 389

Re: Molecular to Empirical

It would remain the same. Changing it like that would translate a different structure.
by Rummel Requerme 1E
Sun Apr 15, 2018 10:24 pm
Forum: SI Units, Unit Conversions
Topic: Correct Units?? [ENDORSED]
Replies: 8
Views: 312

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.
by Rummel Requerme 1E
Sun Apr 15, 2018 10:22 pm
Forum: Molarity, Solutions, Dilutions
Topic: Mass percentage
Replies: 8
Views: 367

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.
by Rummel Requerme 1E
Sun Apr 15, 2018 10:19 pm
Forum: Balancing Chemical Reactions
Topic: Balancing equations with fractions [ENDORSED]
Replies: 13
Views: 491

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.
by Rummel Requerme 1E
Sun Apr 15, 2018 10:16 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Accuracy vs Precision
Replies: 23
Views: 769

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.
by Rummel Requerme 1E
Sun Apr 15, 2018 10:12 pm
Forum: Significant Figures
Topic: Why are sig figs important?
Replies: 13
Views: 1340

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...
by Rummel Requerme 1E
Sun Nov 29, 2015 5:47 pm
Forum: Student Social/Study Group
Topic: CHEM 14A VIDEO: Coordination Compounds (Repost)
Replies: 2
Views: 561

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
by Rummel Requerme 1E
Thu Nov 26, 2015 12:13 pm
Forum: Naming
Topic: CHEM 14A VIDEO: Coordination Compounds
Replies: 1
Views: 197

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?

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