Search found 61 matches

by Nghi Nguyen 2L
Fri Mar 15, 2019 9:50 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Internal energy (U) of an isolated system
Replies: 17
Views: 419

Re: Internal energy (U) of an isolated system

in an isolated system there is neither an exchange of energy nor matter
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:48 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Intermediate vs catalyst
Replies: 8
Views: 95

Re: Intermediate vs catalyst

an intermediate is created and used up in a reaction while a catalyst is present in the beginning and the end of a reaction
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:46 pm
Forum: General Rate Laws
Topic: slow/fast steps
Replies: 7
Views: 84

Re: slow/fast steps

the question will tell us directly
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:45 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Platinum in Cell Diagram
Replies: 7
Views: 128

Re: Platinum in Cell Diagram

Pt is used as a conducting metal when your cell diagram doesn't contain a solid. And it is always added to the outside of the diagram
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:44 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Nernst
Replies: 14
Views: 165

Re: Nernst

n is the number of moles of e- transferred in a balanced redox reaction
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:43 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Anode and Cathode
Replies: 8
Views: 130

Re: Anode and Cathode

cathode is always on the right side of ll and anode always on the left side
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:42 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Reducing/Oxidizing Power
Replies: 7
Views: 127

Re: Reducing/Oxidizing Power

higher standard reduction potential means higher oxidizing power
lower standard reduction potential means higher reducing power
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:39 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Test 2: Melting Ice
Replies: 6
Views: 232

Re: Test 2: Melting Ice

i just thought of it like when you put ice in room temperature, it starts melting without you having to heat it, so therefore it's spontaneous
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:38 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: pKa vs. pH
Replies: 15
Views: 412

Re: pKa vs. pH

pKa = -log(Ka)
pH = -log(H+)
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:37 pm
Forum: Ideal Gases
Topic: How do I know what is an Ideal Gas
Replies: 11
Views: 178

Re: How do I know what is an Ideal Gas

the questions usually tell you directly to assume ideal behavior
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:36 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Overall Order
Replies: 5
Views: 200

Re: Overall Order

you really just use it to determine K and its units
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:35 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ignoring x
Replies: 16
Views: 461

Re: ignoring x

when K is less than 1*10^-3 but I think Dr. Lavelle said on the midterm that he wants use to always use the quadratic formula so I can only assume that applies to the final as well
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:33 pm
Forum: Ideal Gases
Topic: atm vs. bar?
Replies: 23
Views: 437

Re: atm vs. bar?

there isn't that much of a difference between them , just use the unit that the problem states and make sure your R value corresponds
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:31 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: When to use Quadratic equation
Replies: 10
Views: 325

Re: When to use Quadratic equation

i think Dr. Lavelle says he wants us to always use the quadratic formula and not approximate
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:30 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Units
Replies: 6
Views: 254

Re: Units

there shouldn't be any units for Keq, Ka, Kb, Kc, or Kp
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:28 pm
Forum: Administrative Questions and Class Announcements
Topic: Lyndon's Review Sheets
Replies: 9
Views: 519

Re: Lyndon's Review Sheets

it will be posted 9am saturday
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:27 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Does a -E and -G mean that the reverse reaction is spontaneous? [ENDORSED]
Replies: 3
Views: 220

Re: Does a -E and -G mean that the reverse reaction is spontaneous? [ENDORSED]

yeah exactly, when delta G is negative, the forward reaction is spontaneous
and when delta G is positive, the reverse reaction is spontaneous
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:25 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: using q=n(deltaH) vs q=mc(deltaT)
Replies: 4
Views: 255

Re: using q=n(deltaH) vs q=mc(deltaT)

q=nC(delta T) is used for temperature changes
q=n(delta H) is used for phase changes
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:24 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy and Entropy
Replies: 6
Views: 263

Re: Gibbs Free Energy and Entropy

there are a lot of variables that affect delta G, so entropy could be positive or negative
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:22 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: q=mCdeltaT
Replies: 11
Views: 616

Re: q=mCdeltaT

i just look at the units for the specific heat, they should tell you to use grams or moles
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:21 pm
Forum: Balancing Redox Reactions
Topic: Test 2
Replies: 5
Views: 84

Re: Test 2

the lower the standard reduction potential, the higher the reducing agent, since this means that it oxidizes itself and reduces others
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:20 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Delta G spontaneity
Replies: 7
Views: 260

Re: Delta G spontaneity

you really just have to look at delta G in relation to the other variables such as delta H, delta S, and T
knowing their signs will help you determine whether or not delta G is positive or negative, thus giving you spontaneity
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:18 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Limiting Reagents
Replies: 5
Views: 198

Re: Limiting Reagents

when you are given two or more reactants, it's a safe bet to calculate the limiting reagent
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:17 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 112
Views: 74404

Re: Reading the textbook [ENDORSED]

I can't seem to focus when I read the textbook, so I tend to do a lot of practice problems to make up for it
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:14 pm
Forum: Balancing Redox Reactions
Topic: Ranking in order of increasing reducing power
Replies: 6
Views: 140

Re: Ranking in order of increasing reducing power

decreasing reduction potential, which means increasing oxidation reaction, which means increasing reducing power
by Nghi Nguyen 2L
Fri Mar 15, 2019 9:12 pm
Forum: Student Social/Study Group
Topic: Studying for the Final
Replies: 25
Views: 676

Re: Studying for the Final

Doing a lot of worksheets and going to review sessions help a lot
by Nghi Nguyen 2L
Thu Jan 17, 2019 2:12 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: "Shifting"
Replies: 15
Views: 290

Re: "Shifting"

"sitting" means the reaction favors one side, whether it's reactants or products
by Nghi Nguyen 2L
Thu Jan 17, 2019 1:56 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Ice table coefficients [ENDORSED]
Replies: 6
Views: 135

Re: Ice table coefficients [ENDORSED]

you have to balance the equation and look at the stoichiometric coefficients to determine that value
by Nghi Nguyen 2L
Thu Jan 17, 2019 1:53 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc of the Forward/Reverse Reaction
Replies: 6
Views: 190

Re: Kc of the Forward/Reverse Reaction

they are just reciprocals of each other so for the forward reaction it's K and for the reverse reaction its 1/K
by Nghi Nguyen 2L
Thu Jan 17, 2019 1:51 pm
Forum: Ideal Gases
Topic: Concentration or Partial Pressure
Replies: 13
Views: 173

Re: Concentration or Partial Pressure

you can calculate them the same way but the question will specify which to use by giving you a value
by Nghi Nguyen 2L
Thu Jan 17, 2019 1:50 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Changes to K value
Replies: 9
Views: 126

Re: Changes to K value

only temperature affects the K value
by Nghi Nguyen 2L
Thu Jan 17, 2019 1:48 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Tables [ENDORSED]
Replies: 11
Views: 179

Re: ICE Tables [ENDORSED]

You would use an ICE table when you have the initial concentration and you need to find the equilibrium concentration. You will most likely be given these numbers in the question itself.
by Nghi Nguyen 2L
Sat Dec 08, 2018 10:03 pm
Forum: Naming
Topic: cis and trans
Replies: 4
Views: 89

Re: cis and trans

not for naming but definitely for drawing out the structures
by Nghi Nguyen 2L
Sat Dec 08, 2018 10:03 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: A X5 E
Replies: 6
Views: 168

Re: A X5 E

Square pyramidal.
by Nghi Nguyen 2L
Sat Dec 08, 2018 10:02 pm
Forum: Calculating the pH of Salt Solutions
Topic: calculating pH
Replies: 2
Views: 172

Re: calculating pH

You'll be able to find them since strong acids and bases completely dissociate.
by Nghi Nguyen 2L
Sat Dec 08, 2018 10:02 pm
Forum: Naming
Topic: bis-, tris-, etc.
Replies: 4
Views: 210

Re: bis-, tris-, etc.

we use those prefixes for polydentates, and since oxalate is a bidentate, we can use them
by Nghi Nguyen 2L
Sat Dec 08, 2018 10:01 pm
Forum: Identifying Acidic & Basic Salts
Topic: 12.25 6th Edition
Replies: 1
Views: 154

Re: 12.25 6th Edition

You would be able to find the molarity of H3O+ by getting molarity of OH- and then converting it using [H3O+][OH-] = 1.00 x 10^-14.
by Nghi Nguyen 2L
Sat Dec 08, 2018 10:01 pm
Forum: Sigma & Pi Bonds
Topic: Churro 17
Replies: 2
Views: 246

Re: Churro 17

Yes this is in reference to whether the bonds are pi or sigma.
by Nghi Nguyen 2L
Sat Dec 08, 2018 10:01 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: T-shaped structures
Replies: 3
Views: 132

Re: T-shaped structures

for 5 electron density regions, it is less than 90 degrees
by Nghi Nguyen 2L
Sat Dec 08, 2018 9:59 pm
Forum: Air Pollution & Acid Rain
Topic: Acid Rain Formation
Replies: 6
Views: 271

Re: Acid Rain Formation

carbon monoxide, sulfur oxides, and other byproducts from the use of fossil fuels for example mix with water to produce that acidic solution in the rain.
by Nghi Nguyen 2L
Sat Dec 08, 2018 9:59 pm
Forum: Student Social/Study Group
Topic: Sig Figs on Midterm
Replies: 13
Views: 488

Re: Sig Figs on Midterm

to be safe, we should follow all sig fig rules. but just remember that the rules for pH and pOH are different. the sig figs for those count after the decimal.
by Nghi Nguyen 2L
Sat Dec 08, 2018 9:58 pm
Forum: Identifying Acidic & Basic Salts
Topic: What are salts...
Replies: 4
Views: 215

Re: What are salts...

There are acidic salts and basic salts. An example of an acidic salt that would lower the pH would be NH4Cl.
by Nghi Nguyen 2L
Sat Dec 08, 2018 9:58 pm
Forum: Bronsted Acids & Bases
Topic: Strong acid
Replies: 5
Views: 235

Re: Strong acid

it fully ionizes/dissociates in a solution
by Nghi Nguyen 2L
Sat Dec 08, 2018 9:58 pm
Forum: Biological Examples
Topic: Myoglobin, Hemoglobin, and Heme Complex
Replies: 2
Views: 180

Re: Myoglobin, Hemoglobin, and Heme Complex

Simply be familiar with how many oxygen molecules can bind to the myoglobin, how many myglobins compose a hemoglobin, and the centre ligand of the heme complex, which are in the lecture notes!
by Nghi Nguyen 2L
Sat Dec 08, 2018 9:57 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: pH
Replies: 5
Views: 243

Re: pH

pH decreases when H+ increases because the addition of hydrogen ions make the solution more acidic, lowering the pH
by Nghi Nguyen 2L
Sat Dec 08, 2018 9:56 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Formation Constants
Replies: 1
Views: 61

Re: Formation Constants

No you do not need to know this.
by Nghi Nguyen 2L
Sat Dec 08, 2018 9:56 pm
Forum: General Science Questions
Topic: Final Exam
Replies: 5
Views: 349

Re: Final Exam

There might be at least one question about which compound has a higher boiling or melting point.
by Nghi Nguyen 2L
Sat Dec 08, 2018 9:56 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VESPR Shapes
Replies: 3
Views: 142

Re: VESPR Shapes

Thank you!
by Nghi Nguyen 2L
Sat Dec 08, 2018 9:55 pm
Forum: Conjugate Acids & Bases
Topic: Strong acids
Replies: 3
Views: 200

Re: Strong acids

When being asked to choose the stronger base, you should also consider the resulting anion stability.
by Nghi Nguyen 2L
Sat Dec 08, 2018 9:55 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond angles
Replies: 3
Views: 132

Re: Bond angles

for square planar, it is technically 90 degrees and 180 degrees but he will accept either
by Nghi Nguyen 2L
Sat Dec 08, 2018 9:54 pm
Forum: Bronsted Acids & Bases
Topic: Strong base
Replies: 5
Views: 263

Re: Strong base

Strong base because it fully ionizes in solution ( OH- is given up easily with details regarding the bond between the OH- and the Na+).
by Nghi Nguyen 2L
Sat Dec 08, 2018 9:54 pm
Forum: Amphoteric Compounds
Topic: polydentate
Replies: 4
Views: 228

Re: polydentate

Monodentate is a ligand that bonds to one site on your transition metal. On the other hand, polydentates are when the ligands bond to more than one location. An example of a polydentate would be EDTA.
by Nghi Nguyen 2L
Sat Dec 08, 2018 9:53 pm
Forum: Amphoteric Compounds
Topic: amphoteric
Replies: 2
Views: 187

Re: amphoteric

If a compound is a amphoteric, then for the most part it is also amphiprotic.
by Nghi Nguyen 2L
Sat Dec 08, 2018 9:53 pm
Forum: Naming
Topic: Do we need to know the ligand (en)?
Replies: 2
Views: 82

Re: Do we need to know the ligand (en)?

yes we do it is NH2CH2CH2NH2
by Nghi Nguyen 2L
Sat Dec 08, 2018 9:52 pm
Forum: Air Pollution & Acid Rain
Topic: Blood pH
Replies: 2
Views: 173

Re: Blood pH

We won't be doing anything in terms of calculations with those buffers. Just know of them and that they serve a suffers in blood.
by Nghi Nguyen 2L
Sun Oct 21, 2018 11:06 pm
Forum: Photoelectric Effect
Topic: Visible Light Spectrum
Replies: 6
Views: 88

Re: Visible Light Spectrum

Yes, basically from 400 nm to 700 nm, with violet being the shortest and red being the longest.
by Nghi Nguyen 2L
Sun Oct 21, 2018 11:05 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Test Question
Replies: 8
Views: 127

Re: Test Question

I believe that we do not have to draw the shapes, but we do have to be able to recognize and identify them.
by Nghi Nguyen 2L
Sun Oct 21, 2018 11:03 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: S,P,D,F
Replies: 6
Views: 144

Re: S,P,D,F

for d-orbitals the trend would be dxy, dyz, dzx, dx^2-y^2, dz^2
by Nghi Nguyen 2L
Mon Oct 01, 2018 9:47 pm
Forum: Limiting Reactant Calculations
Topic: Percent yield
Replies: 10
Views: 243

Re: Percent yield

In the majority of questions, the actual yield will be given to you, so you won't have to calculated yourself. Instead you might be asked to calculate the theoretical yield instead.
by Nghi Nguyen 2L
Mon Oct 01, 2018 9:45 pm
Forum: SI Units, Unit Conversions
Topic: Homework written in pencil or pen?
Replies: 4
Views: 135

Re: Homework written in pencil or pen?

Pen or pencil doesn't matter as long as your homework is legible. I personally like pencil because I make a lot of mistakes.
by Nghi Nguyen 2L
Mon Oct 01, 2018 9:44 pm
Forum: Balancing Chemical Reactions
Topic: Law of Conservation of Mass [ENDORSED]
Replies: 7
Views: 172

Re: Law of Conservation of Mass [ENDORSED]

The easiest way to understand the Law of Conservation of Mass is that matter is neither created nor destroyed. This means that in a chemical equation, the number of reactant atoms are equal to the number of product atoms. The Law of Conservation on Mass is one of the key concepts in understanding ho...

Go to advanced search