Search found 54 matches

by Elizabeth Bamishaye 2I
Sat Mar 17, 2018 3:03 pm
Forum: *Enzyme Kinetics
Topic: Catalysts in a reaction
Replies: 7
Views: 296

Re: Catalysts in a reaction

Varsha Swamy 2J wrote:Catalysts go from reactant to product, while intermediates go from product to reactant.


Yes! Intermediates are not in the overall reaction too; they are produced then consumed. Catalysts are consumed then produced.
by Elizabeth Bamishaye 2I
Sat Mar 17, 2018 2:52 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: UA Practice Final 1D and 1E
Replies: 3
Views: 93

Re: UA Practice Final 1D and 1E

I know that for part E, what would make the statement true would be if the "Ecell will decrease if a substance is added to the cathode side that precipitates Cu2+."

What would help to understand this is the Le Chatelier's Principle.
by Elizabeth Bamishaye 2I
Sat Mar 17, 2018 1:00 pm
Forum: *Alkanes
Topic: Final
Replies: 11
Views: 557

Re: Final

Yeah just focus on what he gave us in lecture and what they contain.
by Elizabeth Bamishaye 2I
Sun Mar 11, 2018 6:12 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: A relationship to K
Replies: 2
Views: 57

Re: A relationship to K

When the molecules in a reaction collide with each other more, or if there is a higher frequency, then there is a greater chance that a reaction will occur. The molecules need to collide in order for the reaction to occur, and the having a high frequency increases collisions. Therefore, because mor...
by Elizabeth Bamishaye 2I
Sun Mar 11, 2018 4:03 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: K
Replies: 7
Views: 153

Re: K

Although Dr. Lavelle hasn't gone over it in class yet, the Arrhenius equation k=Ae^{-E_{a}/RT} helps determine what factors change the K value. The K increases if the activation energy decreases or if the temperature increases. I agree with this! But now that he has gone over this we now know this ...
by Elizabeth Bamishaye 2I
Sun Mar 11, 2018 2:18 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: The Slow Step of a Reaction
Replies: 2
Views: 60

Re: The Slow Step of a Reaction

From my understanding, fast steps are the only ones really that could be in equilibrium.
by Elizabeth Bamishaye 2I
Thu Mar 08, 2018 9:28 am
Forum: First Order Reactions
Topic: Zero-order vs. First-order reaction graphs
Replies: 5
Views: 295

Re: Zero-order vs. First-order reaction graphs

The main difference is the y-axis for both, which is [A] for zero order and ln[A] for the first order.
by Elizabeth Bamishaye 2I
Thu Mar 08, 2018 9:20 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: Rate Constant K
Replies: 3
Views: 188

Re: Rate Constant K

An important note is to make sure to not confuse the rate constant "k" with the equilibrium constant "K".
by Elizabeth Bamishaye 2I
Thu Mar 08, 2018 9:17 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Intermediate [ENDORSED]
Replies: 7
Views: 130

Re: Intermediate [ENDORSED]

Intermediates are the species that are not in overall reaction. You could find them by viewing a species that is produced then it is consumed.
by Elizabeth Bamishaye 2I
Sun Feb 25, 2018 9:02 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Chapter 15 related videos
Replies: 6
Views: 151

Re: Chapter 15 related videos

All of these listed above would help. Sometimes even searching a topic on youtube could lead you to other good and helpful videos.
by Elizabeth Bamishaye 2I
Sun Feb 25, 2018 8:56 pm
Forum: Balancing Redox Reactions
Topic: Does order matter?
Replies: 7
Views: 168

Re: Does order matter?

Erik Khong 2E wrote:I am sure it doesn't really matter for this class, but I personally like to keep them in the order of importance. I tend to have them in the order of the species being reduced, the species being oxidized, then H2O and/or H+.

Yeah, I like to do this as well.
by Elizabeth Bamishaye 2I
Sun Feb 25, 2018 8:44 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Using K
Replies: 3
Views: 84

Re: Using K

Yeah, this question needs to be more specific, but I would go by what the person above said.
by Elizabeth Bamishaye 2I
Wed Feb 21, 2018 6:46 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: K sig figs
Replies: 4
Views: 117

Re: K sig figs

I would go by the smallest one you see in the problem, to be honest.
by Elizabeth Bamishaye 2I
Wed Feb 21, 2018 6:42 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Nernst equation usage
Replies: 3
Views: 109

Re: Nernst equation usage

The Nernst equation is used when finding the E under non-standard conditions. There are multiple versions of the equation, but they all mean the same thing and can be used interchangeably. I believe the equation you are talking about is E°=(RTlnK)/nF, which is pretty much the same thing again. This...
by Elizabeth Bamishaye 2I
Wed Feb 21, 2018 6:39 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Electrochem Exam
Replies: 3
Views: 89

Re: Electrochem Exam

We would be told what to find. If it is not asked in the problem then I wouldn't worry much about it.
by Elizabeth Bamishaye 2I
Sun Feb 11, 2018 2:20 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Derivations of Equations
Replies: 5
Views: 120

Re: Derivations of Equations

I agree with Vincent.
by Elizabeth Bamishaye 2I
Sun Feb 11, 2018 2:18 pm
Forum: Van't Hoff Equation
Topic: Constants and formulas
Replies: 7
Views: 231

Re: Constants and formulas

I think it is a possibility that it will be on the midterm.
by Elizabeth Bamishaye 2I
Sun Feb 11, 2018 2:16 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Concept of Second Law of Thermodynamics
Replies: 6
Views: 264

Re: Concept of Second Law of Thermodynamics

To add onto the previous comments, the second law of thermodynamics states that changes in entropy can never be negative.
by Elizabeth Bamishaye 2I
Sun Feb 04, 2018 2:30 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: syllabus
Replies: 4
Views: 142

Re: syllabus

Yes, we will most likely be learning new material next week that would be on the midterm as well. He will make announcements about what would be on the exam, but what we learned already will definitely be on the midterm.
by Elizabeth Bamishaye 2I
Sun Feb 04, 2018 2:26 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Maximum work
Replies: 2
Views: 90

Re: Maximum work

In lecture, Dr. Lavelle mentioned "Maximum work done by a process at constant Temperature & Pressure; also dG for a spontaneous process represents the energy that is free to do useful work."
by Elizabeth Bamishaye 2I
Sun Feb 04, 2018 2:22 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated
Replies: 9
Views: 260

Re: Isolated

Christina Cen 3E wrote:There isn't any exchange in heat or matter with the surroundings of an isolated system, but heat can still be generated inside the system itself. This change is isolated because it is contained within the system, and the heat is not released into the surroundings.

Yes, I agree with this.
by Elizabeth Bamishaye 2I
Sun Jan 28, 2018 2:21 pm
Forum: Phase Changes & Related Calculations
Topic: When to use Kelvin or Celsius
Replies: 10
Views: 238

Re: When to use Kelvin or Celsius

Yes, I agree with all of the responses above because at some point I was thinking about this as well. It really depends on what you are given in the problem and what you have to look for.
by Elizabeth Bamishaye 2I
Sun Jan 28, 2018 2:12 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: More Entropy vs. Less Entropy
Replies: 3
Views: 89

Re: More Entropy vs. Less Entropy

Yes, I think when Dr. Lavelle says disorder it gets a bit confusing.

Basically, entropy increases when the temperature increases. Therefore, something with larger volume and lower pressure has more entropy; whereas something with lower volume and the larger press has less entropy.
by Elizabeth Bamishaye 2I
Sun Jan 28, 2018 2:07 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Question About Entropy
Replies: 3
Views: 54

Re: Question About Entropy

To add to this, entropy is described to measure the disorder in a system. With that comes a basis of different available orders of molecules in a given system.
by Elizabeth Bamishaye 2I
Sun Jan 21, 2018 1:15 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Why is enthalpy a state function? Why is heat not a state function?
Replies: 5
Views: 324

Re: Why is enthalpy a state function? Why is heat not a state function?

A state function is independent of pathways taken to get to a specific value, such as energy, temperature, enthalpy, and entropy. Enthalpy is the amount of heat released or absorbed at a constant pressure. Heat is not a state function because it is only to transfer energy in or out of a system; it d...
by Elizabeth Bamishaye 2I
Sun Jan 21, 2018 12:07 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Heat v Thermal Energy
Replies: 3
Views: 102

Re: Heat v Thermal Energy

The transferring of heat occurs because of thermal energy because thermal energy is the driving force for heat transfer.
by Elizabeth Bamishaye 2I
Sun Jan 21, 2018 12:01 pm
Forum: Phase Changes & Related Calculations
Topic: Equations to know
Replies: 6
Views: 166

Re: Equations to know

Yes, I agree. We will be given all the formulas that we need to know for the class but sometimes you have to combine multiple equations for one problem and you are expected to know how to use them accurately.
by Elizabeth Bamishaye 2I
Fri Jan 12, 2018 2:36 pm
Forum: Administrative Questions and Class Announcements
Topic: Can homework be written in pencil?
Replies: 6
Views: 227

Re: Can homework be written in pencil?

Yes, I think so as well because you are working out the problems and practicing but when it comes to the test, you must write everything in pen.
by Elizabeth Bamishaye 2I
Fri Jan 12, 2018 2:33 pm
Forum: Administrative Questions and Class Announcements
Topic: HW for week 2 disc
Replies: 5
Views: 197

Re: HW for week 2 disc

Yes, all you have to do is basically choose any problems to turn into your discussion section, but because this is week 1 and the first discussion sections start on Tuesday, it wouldn't give enough time and exposure to what we have learned so we have to turn in 14 problems to our discussion section ...
by Elizabeth Bamishaye 2I
Fri Jan 12, 2018 2:28 pm
Forum: Phase Changes & Related Calculations
Topic: qv vs qp
Replies: 4
Views: 450

Re: qv vs qp

Also to add on the previous answers: qv is the heat absorbed or released at constant volume and uses bomb calorimetry; while qp is the heat absorbed or released at constant pressure and gives enthalpy values.
by Elizabeth Bamishaye 2I
Tue Dec 05, 2017 4:02 pm
Forum: Sigma & Pi Bonds
Topic: Double Bond Being Pi+Pi
Replies: 2
Views: 162

Re: Double Bond Being Pi+Pi

From lecture, I remember that it is the triple bond that would consist of 1 sigma bond and 2 pi bonds, which would be the time where there are 2 pi bonds.
by Elizabeth Bamishaye 2I
Tue Dec 05, 2017 3:29 pm
Forum: Amphoteric Compounds
Topic: Amphoteric and amphiprotic compounds
Replies: 4
Views: 216

Re: Amphoteric and amphiprotic compounds

Amphoteric compounds have both basic and acidic character, and the prime example of this is water.
Amphiprotic is a molecule that can act as a proton donor or proton acceptor.
by Elizabeth Bamishaye 2I
Fri Dec 01, 2017 12:53 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Dentates
Replies: 6
Views: 221

Re: Dentates

A monodentate ligand has one donor atom used to bond to the central atom or ion as they bind to the central atom or ion at one point. A bidentate ligand has 2 donor atoms used to bond to a central atom or ion at 2 points. A polydentate ligand is characterized by having more than 2 sites used to bond...
by Elizabeth Bamishaye 2I
Wed Nov 29, 2017 1:41 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's Principle
Replies: 4
Views: 182

Re: Le Chatelier's Principle

- If reaction requires heat (endothermic) while forming a product, then increasing the temperature will favor products and equilibrium will be shifted to the right (K would increase). - If reaction gives off heat (exothermic) while forming a product, then increasing the temperature will favor reacta...
by Elizabeth Bamishaye 2I
Tue Nov 28, 2017 11:53 pm
Forum: Naming
Topic: Iron v ferrate in coordination compound naming
Replies: 8
Views: 1017

Re: Iron v ferrate in coordination compound naming

Yes, it is when naming coordination compounds. My TA also had in my discussion section that, "for some metals, the Latin names are used in the complex anions (e.g. Fe is called ferrate, not ironate)."
by Elizabeth Bamishaye 2I
Tue Nov 21, 2017 1:14 pm
Forum: Hybridization
Topic: Filling the hybrid orbitals?
Replies: 12
Views: 399

Re: Filling the hybrid orbitals?

Electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels, so you would complete the orbital until moving on to the next. Yes, so spin-pair in the s-orbital and then parallel spins in the p-orbital before spin-pairing in the p orbital. (Right?) Yes, that's ...
by Elizabeth Bamishaye 2I
Tue Nov 21, 2017 1:12 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Can the equilibrium constant be calculated using both concentration and partial pressure?
Replies: 2
Views: 145

Re: Can the equilibrium constant be calculated using both concentration and partial pressure?

You are to find one or the other, not both at the same time.

In order to be considered a equilibrium constant of pressure (), it should be a gaseous reaction; p can have units of pressure (e.g., atm or bar).
by Elizabeth Bamishaye 2I
Tue Nov 21, 2017 12:56 pm
Forum: Hybridization
Topic: 4.31
Replies: 2
Views: 111

Re: 4.31

It would be just like using the rules of VSEPR orientations; in order to bond, you have to hybridize orbitals to have areas of electron density. If it's tetrahedral then there are 4 equivalent orbitals and its more stable (due to VSEPR), therefore it is sp3 and is in a tetrahedral orientation.
by Elizabeth Bamishaye 2I
Sat Nov 18, 2017 12:51 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Radicals and Shape
Replies: 2
Views: 143

Re: Radicals and Shape

Radicals is a molecule, ion or atom that have an unpaired electron; these species are highly reactive towards themselves and/or other substances.
by Elizabeth Bamishaye 2I
Fri Nov 17, 2017 11:43 am
Forum: Hybridization
Topic: Filling the hybrid orbitals?
Replies: 12
Views: 399

Re: Filling the hybrid orbitals?

Electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels, so you would complete the orbital until moving on to the next.
by Elizabeth Bamishaye 2I
Wed Nov 08, 2017 6:53 pm
Forum: Ionic & Covalent Bonds
Topic: Valence of an Atom [ENDORSED]
Replies: 3
Views: 163

Re: Valence of an Atom [ENDORSED]

A covalent bond is a bond in compounds that result from sharing one or more pairs of electrons. Therefore, in the powerpoint, it was basically saying that atoms are able to combine in order to create an octet of valence electrons by sharing electrons.

(Hopefully this makes sense.)
by Elizabeth Bamishaye 2I
Wed Nov 08, 2017 6:42 pm
Forum: Electronegativity
Topic: Electropositivity
Replies: 3
Views: 265

Re: Electropositivity

Yes, it is the complete opposite. Electropositivity is more for metals while electronegativity is more for non-metals. It increases in a group from top to bottom and decreases across a period from left to right.
by Elizabeth Bamishaye 2I
Wed Nov 08, 2017 6:32 pm
Forum: Bond Lengths & Energies
Topic: Factors that control bond length
Replies: 3
Views: 424

Re: Factors that control bond length

With ionic bonds, the distance and charge affect the strength of the bond. For example, if there are more electrons being transferred then the bond would be stronger. With covalent bonds, the length of the bond and electronegativity affect the strength of the bond. Moreover, triple bonds > double bo...
by Elizabeth Bamishaye 2I
Tue Oct 31, 2017 6:14 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.47 [ENDORSED]
Replies: 2
Views: 175

Re: 2.47 [ENDORSED]

A way to remember too is that when an electron is being removed because has to form a +1 ion, you have to take 1 electron off the outermost energy level. For Ba, the electron configuration is 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^1^0 4p^6 5s^2 4d^1^0 5p^6 6s^2 ; the outermost energy level happens to be t...
by Elizabeth Bamishaye 2I
Tue Oct 31, 2017 5:52 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Understadning Heisenberg Indeterminacy Equation
Replies: 6
Views: 302

Re: Understadning Heisenberg Indeterminacy Equation

Will the Heisenberg Indeterminacy Equation be given to us for Test 3 or should we know it for the test? I think that we should know it because it is at the start of Section 1.6. Also, for Test 3 we could get anything from section 1.6 to all of chapter 2. It's on the constant sheet too so you don't ...
by Elizabeth Bamishaye 2I
Wed Oct 25, 2017 5:37 pm
Forum: Ionic & Covalent Bonds
Topic: covalent bond
Replies: 7
Views: 457

Re: covalent bond

Yes, it is true. Covalent bonds are formed when two nonmetals or a nonmetal and a metalloid share electrons.
by Elizabeth Bamishaye 2I
Wed Oct 25, 2017 5:27 pm
Forum: Lewis Structures
Topic: Coulomb Potential Energy
Replies: 2
Views: 84

Re: Coulomb Potential Energy

Coulomb potential energy is the potential energy of an electric charge associated with another electric charge in a certain configuration. The potential energy depends on the amount of charge that each object contains, how far apart the charges are (distance), and Coulomb's constant. In the book, it...
by Elizabeth Bamishaye 2I
Wed Oct 18, 2017 4:19 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Models of Atoms- Question 2.31
Replies: 4
Views: 179

Re: Models of Atoms- Question 2.31

For further clarification, the d orbital starts with 3d and goes to 3d^10. The d orbital specifically starts with the transition metals because those orbitals are what give them their properties. The order for electron configurations would go 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^2, 3d^10, 4p^6, and so ...
by Elizabeth Bamishaye 2I
Wed Oct 18, 2017 4:02 pm
Forum: DeBroglie Equation
Topic: Homework 1.13/ Rydberg
Replies: 3
Views: 172

Re: Homework 1.13/ Rydberg

The would be 2 because that is the while is the .

The equation you are to use is: then you find the wavelength.
by Elizabeth Bamishaye 2I
Tue Oct 10, 2017 4:34 pm
Forum: Photoelectric Effect
Topic: CH.1 #33 pt B
Replies: 3
Views: 217

Re: CH.1 #33 pt B

For part A, you determine the mass of electrons, which is 9.109\times 10^-31 kg . Then you change the given velocity from kilometers to meters and after that use the equation \lambda =h(m\nu )^{-1} or basically \frac{h}{m\nu} to get the answer for part A. For part b, you use E= h\nu to get t...
by Elizabeth Bamishaye 2I
Tue Oct 10, 2017 3:49 pm
Forum: Properties of Light
Topic: Converting to Different Units
Replies: 3
Views: 156

Re: Converting to Different Units

Mr. Lavelle mentioned that we do need to know them, but I feel like the most important are from kilo to pico. The bolded ones are the ones that I have tended to see more often by the problems we have done so far. Prefixes and their meaning: Giga 10^9 Mega 10^6 _______________________ Kilo 10^3 Deci ...
by Elizabeth Bamishaye 2I
Thu Oct 05, 2017 12:02 pm
Forum: Limiting Reactant Calculations
Topic: Question M.1 [ENDORSED]
Replies: 4
Views: 536

Re: Question M.1 [ENDORSED]

Basically, you are solving for the theoretical yield and once you get that you divide it from the 25.2g of hydrazine produced then multiply by 100 to receive the percentage yield of hydrazine.
by Elizabeth Bamishaye 2I
Thu Oct 05, 2017 11:45 am
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 113
Views: 33103

Re: Rusty on High School Chem [ENDORSED]

I am also a little rusty on chemistry but Crash Course Chemistry on YouTube is definitely something helpful to watch.
by Elizabeth Bamishaye 2I
Thu Oct 05, 2017 11:39 am
Forum: Significant Figures
Topic: F5: Problem deciding significant figures
Replies: 2
Views: 177

Re: F5: Problem deciding significant figures

I used four sig figs for the whole problem. I generally always use 1.008 as the molar mass of hydrogen so I did not have this problem. It would also help if you calculated it all and rounded the hydrogen to thousandths if you used 1.0078 as the molar mass of hydrogen so you would get 100% at once in...

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