Search found 113 matches

by ashwathinair
Sat Mar 14, 2020 9:30 pm
Forum: General Rate Laws
Topic: Rate Constant
Replies: 3
Views: 74

Rate Constant

Wasn't sure where to put this, but is there anything that can alter a reaction's rate constant (for example, temperature or pressure)? Or does the rate constant remain the same in all situations?
by ashwathinair
Sat Mar 14, 2020 8:49 pm
Forum: General Rate Laws
Topic: How to use general rate laws to find rates of specific equations?
Replies: 4
Views: 96

Re: How to use general rate laws to find rates of specific equations?

Wait never mind, I found the unimolecular/bimolecular info in my notes! Thanks!
by ashwathinair
Sat Mar 14, 2020 8:35 pm
Forum: General Rate Laws
Topic: How to use general rate laws to find rates of specific equations?
Replies: 4
Views: 96

Re: How to use general rate laws to find rates of specific equations?

Rate laws can be used in this question because for bimolecular reactions like the one in part a, the rate is simply equal to k[NO}^2, because there are two molecules of NO reacting and colliding with each other. This makes the coefficient for NO 2, and thus that becomes the exponent in the rate law...
by ashwathinair
Sat Mar 14, 2020 8:31 pm
Forum: Administrative Questions and Class Announcements
Topic: Take Home Final
Replies: 16
Views: 271

Re: Take Home Final

Do you guys think it will be all MC questions with a purely correct/incorrect grading style? I'd imagine there would be some multiple choice and some fill-in-the-blank, but I think since we probably can't show work it would be a full correct/incorrect grading scale. Also, since Prof Lavelle also me...
by ashwathinair
Sat Mar 14, 2020 8:24 pm
Forum: General Rate Laws
Topic: How to use general rate laws to find rates of specific equations?
Replies: 4
Views: 96

How to use general rate laws to find rates of specific equations?

How do you use rate laws to find the rate of a specific reaction? For example, in 7C 1:
Each of the following is an elementary reaction. Write its rate law and state its molecularity. (a) NO + NO --> N2O2; (b) Cl2 --> Cl + Cl.
by ashwathinair
Sat Mar 14, 2020 6:21 pm
Forum: Administrative Questions and Class Announcements
Topic: Partial Credit
Replies: 2
Views: 47

Re: Partial Credit

Ooh, I'm not sure about that, but I know usually when we do problems it's best to just keep all of the decimal points in intermediate answers before we get to the final answer. So only round to sigfigs at the final product.
by ashwathinair
Sat Mar 14, 2020 6:17 pm
Forum: Administrative Questions and Class Announcements
Topic: Final- general questions
Replies: 12
Views: 170

Re: Final- general questions

It's open book/open note, is 30 qs/5 pts each, starts at 11:15 on CCLE, and lasts 3.5 hours. Prof Lavelle said most people should finish it in 2 so that should be a good sign.
by ashwathinair
Sat Mar 14, 2020 6:15 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: 7B 3(c)
Replies: 2
Views: 67

7B 3(c)

Determine the rate constant for each of the following first order reactions, in each case expressed for the rate of loss of A: (c) 2A --> B + C, given that [A]0 = 0.153 mol/L and that after 115 s the concentration of B rises to 0.034 mol/L. I was able to do parts (a) and (b) for this problem, but I'...
by ashwathinair
Tue Mar 10, 2020 12:06 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Developing a Proposed Reaction Mechanism
Replies: 3
Views: 21

Developing a Proposed Reaction Mechanism

When creating a possible reaction mechanism, do we generally just have to find one by trial and error? Are there any specific guidelines to keep in mind for developing a reaction mechanism?
by ashwathinair
Tue Mar 10, 2020 12:03 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Adsorption
Replies: 7
Views: 44

Re: Adsorption

805312064 wrote:Okay that makes sense. One more question, what does adhesion/adsorption have to do with catalysts?


Basically, when an enzyme is catalyzing a reaction, the substrates are not absorbed INTO the enzyme. Rather, they sit on top of it in a specific active site.
by ashwathinair
Tue Mar 10, 2020 12:01 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: Reactant for Initial Rate
Replies: 2
Views: 23

Reactant for Initial Rate

Why do we only use reactant rate for initial rate (and not product)? Also, in which reactions is this rule used (like is this used only when calculating a specific order reaction or is this used for all reactions)?
by ashwathinair
Tue Mar 10, 2020 12:00 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Determining reaction rate for overall reaction
Replies: 3
Views: 42

Determining reaction rate for overall reaction

How do we know what the rate limiting reaction within a proposed reaction mechanism is? I know that it has the slowest rate, but is this something we generally calculate ourselves (if so, how?) or not?
by ashwathinair
Mon Mar 09, 2020 11:58 pm
Forum: Second Order Reactions
Topic: Derivations of Reactions
Replies: 3
Views: 59

Derivations of Reactions

Will we need to know how to derive 0-, 1- or 2-order reaction equations for the final?
by ashwathinair
Mon Mar 02, 2020 10:31 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Ways to calculate Gibbs free energy
Replies: 5
Views: 70

Re: Ways to calculate Gibbs free energy

I think it mostly just depends on what they give you. If you're given a table with delta G of different molecules, then you use the second one. I understand this, but for one of the homework questions (5J 15), we were supposed to use different methods of finding deltaG at different temperatures (25...
by ashwathinair
Mon Mar 02, 2020 10:26 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6L 9
Replies: 2
Views: 29

6L 9

(a) Write balanced half-reactions for the redox reaction of an acidified solution of potassium permanganate and iron(II) chloride. (b) Write the balanced equation for the cell reaction and devise a galvanic cell to study the reaction (write its cell diagram Why do we not include the Cl and the K in ...
by ashwathinair
Sun Mar 01, 2020 10:32 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: n value
Replies: 4
Views: 78

Re: n value

The n value should always be the same for a specific redox reaction, as half reactions are multiplied by a scalar in order to equalize number of electrons on both sides before they are added to create a fully balanced reaction. This equivalent number of electrons is what should be used in Nernst.
by ashwathinair
Sun Mar 01, 2020 10:29 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Ways to calculate Gibbs free energy
Replies: 5
Views: 70

Ways to calculate Gibbs free energy

For cell/redox problems, when do we use deltaG = deltaH - TdeltaS and deltaG = deltaG(products) - deltaG(reactants)?
by ashwathinair
Sun Mar 01, 2020 10:27 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Galvanic Cells and pH
Replies: 1
Views: 42

Galvanic Cells and pH

Do the sides of galvanic cells (anode and cathode) have different pH, and if so, how might that affect how we solve for half reactions?
by ashwathinair
Sun Mar 01, 2020 10:26 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6L 7
Replies: 1
Views: 37

6L 7

Write the half-reactions and devise a galvanic cell (write a cell diagram) to study each of the following reactions: (a) AgBr(s) <---> Ag+(aq) + Br-(aq), a solubility equilibrium (b) H+(aq) + OH-(aq) ---> H2O(l), the Brønsted neutralization reaction (c) Cd(s) + 2Ni(OH)3(s) ---> Cd(OH)2(s) + 2Ni(OH)2...
by ashwathinair
Sun Mar 01, 2020 10:20 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Test 2
Replies: 4
Views: 54

Test 2

Do you guys think for this upcoming test we are going to have to look up Eo values on a table like we had to for the midterm?
by ashwathinair
Fri Feb 28, 2020 6:21 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 5J 15
Replies: 3
Views: 53

Re: 5J 15

D is actually deuterium and the values can be found in the Appendix You could use that formula at 25 degrees celsius since the values in the appendix are at that temperature. However, for 150 degrees celsius, you'll need to use the equation delta G= delta H-T(delta S) Hope that helps! Oh ok, thanks...
by ashwathinair
Thu Feb 27, 2020 2:33 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 5J 15
Replies: 3
Views: 53

5J 15

Calculate the equilibrium constant at 25 8C and at 150 8C for each of the following reactions, using data available in Appendix 2A: (a) NH4Cl(s) <--> NH3(g) + HCl(g) (b) H2(g) + D2O(l) <--> D2(g) + H2O(l) How do we calculate for (b)? What values do we use for this, as D2O and D2 obviously are not te...
by ashwathinair
Sun Feb 23, 2020 11:11 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: galvanic cell function
Replies: 2
Views: 33

galvanic cell function

I wasn't in class for lecture this week so I don't fully understand the cell diagram for a galvanic cell. Exactly how does a galvanic cell work (through redox reaction, salt bridge/porous disk, etc)?
by ashwathinair
Sun Feb 23, 2020 11:07 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: STP
Replies: 13
Views: 155

Re: STP

We need to assume 273 K/0 C temperature and 1 atm pressure under STP.
by ashwathinair
Sun Feb 23, 2020 11:06 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Eo as an intensive property
Replies: 9
Views: 111

Eo as an intensive property

Why exactly is Eo intensive?
by ashwathinair
Sun Feb 23, 2020 11:01 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Assuming conditions
Replies: 2
Views: 36

Assuming conditions

In what situations would we assume 1 M solution or 1 atm at 25 degrees Celsius?
by ashwathinair
Sun Feb 23, 2020 10:59 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Calculation of Eo of a cell
Replies: 3
Views: 60

Re: Calculation of Eo of a cell

AngieGarcia_4F wrote:I think what equation you'd use would depend on what info the question provides


Specifically what info would you need to know from the question to distinguish between the two? What if you don't necessarily have all of the info you might need?
by ashwathinair
Sun Feb 16, 2020 5:03 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy of a System
Replies: 2
Views: 35

Gibbs Free Energy of a System

Can someone explain conceptually what the overall Gibbs Free Energy of a system equation means?
deltaG = deltaG* + RTlnQ

How does this relate to deltaG = deltaH - TdeltaS? Are these equal to each other or is the second equation supposed to be deltaG* in the first equation?
by ashwathinair
Sun Feb 16, 2020 4:59 pm
Forum: Van't Hoff Equation
Topic: K in Van't Hoff
Replies: 3
Views: 32

K in Van't Hoff

How/why does K as the equilibrium constant relate into the Van't Hoff equation? What does that mean conceptually?
by ashwathinair
Sun Feb 16, 2020 4:57 pm
Forum: Balancing Redox Reactions
Topic: How do you combine half reactions?
Replies: 4
Views: 48

Re: How do you combine half reactions?

So would this be similar to how in Hess's law we would add intermediate equations to make the final reaction?
by ashwathinair
Sun Feb 16, 2020 4:55 pm
Forum: Balancing Redox Reactions
Topic: Electrons in Compounds
Replies: 1
Views: 26

Electrons in Compounds

Just to clarify, when you are trying to figure out how many electrons are in a compound (for redox reactions), no matter if the compound is covalent or ionic you usually just use the butterfly method (for H2O, the 1 subscript from O goes to the top of H - making it +1 - while the 2 subscript from H ...
by ashwathinair
Sun Feb 16, 2020 4:49 pm
Forum: Balancing Redox Reactions
Topic: oxidation vs reduction
Replies: 19
Views: 222

Re: oxidation vs reduction

In oxidation, an atom loses electrons while in reduction electrons are gained (OILRIG). Specifically in situations where the electrons are in compounds, the best way to be able to tell if some atom has been oxidized or reduced is by figuring out how many electrons each atom in a compound has through...
by ashwathinair
Mon Feb 10, 2020 7:58 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Relationship between Delta S Surroundings and Delta S System
Replies: 1
Views: 51

Relationship between Delta S Surroundings and Delta S System

Other than del(S surr) + del(S sys) = del(S univ), how are del(S surr) and del(S sys) related? Like how can you find del(S surr) if you only have del(S sys) or vice versa? What other information would you need for that? Also, under what conditions might del(S surr) = -del(S sys) be true - in other w...
by ashwathinair
Sun Feb 09, 2020 11:00 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Reversible and Irreversible Reactions
Replies: 3
Views: 53

Reversible and Irreversible Reactions

I wasn't super sure where to put this, but I wanted to know how to tell the difference between reversible and irreversible reactions. Are phase changes reversible? What are the markers to know whether a chemical reaction is reversible or irreversible?
by ashwathinair
Sun Feb 09, 2020 10:26 pm
Forum: Student Social/Study Group
Topic: Number of Chemistry Community Posts
Replies: 33
Views: 715

Re: Number of Chemistry Community Posts

Sometimes I post multiple times on the same thread - is this counted as separate posts or as just one?
by ashwathinair
Sun Feb 09, 2020 10:24 pm
Forum: Student Social/Study Group
Topic: Midterm Topics
Replies: 12
Views: 165

Re: Midterm Topics

Do we know how much of each topic will be on the midterm? Will it be similar to Pizza Rolls where there was a clearly heavier focus on more recent stuff or will it be more equal between equilibrium and enthalpy/entropy/Gibbs free energy?
by ashwathinair
Sun Feb 09, 2020 10:22 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Entropy calculations (rev and irrev)
Replies: 2
Views: 41

Entropy calculations (rev and irrev)

Delta S = q(rev)/T can only be used for reversible reactions, right? Does this mean other ways to find delta S, such as nC(T2/T1) or nR(P1/P2) etc only apply to irreversible reactions, or can this be used for both?
by ashwathinair
Sun Feb 09, 2020 10:18 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: m and n in heat capacity
Replies: 4
Views: 35

m and n in heat capacity

Why can we use mass and moles in different heat capacity equations and still get an equivalent result?
by ashwathinair
Sun Feb 09, 2020 10:16 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Types of Entropy Calculations
Replies: 1
Views: 28

Types of Entropy Calculations

I've noticed that change of entropy calculations using moles/temperature/volume etc tend to be much larger than entropy calculations using degeneracy and Boltzmann's constant - are these two types of calculations calculating entropy at different levels, and if so, what are they?
by ashwathinair
Sun Feb 09, 2020 10:13 pm
Forum: Student Social/Study Group
Topic: Midterm Studying
Replies: 5
Views: 94

Midterm Studying

Hey everyone! I was wondering how to best approach studying for the upcoming midterm? I feel like there is so much to remember and understand how to use and I'm not very confident in the studying I'm doing (redoing all the homework questions) because it just feels like a lot of busy work and I don't...
by ashwathinair
Sun Feb 09, 2020 10:05 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Cv vs Cp
Replies: 3
Views: 59

Re: Cv vs Cp

I have another question related to this - in Lyndon's review session for Pizza Rolls today he used Cv for a problem that had changing volume (problem 5) and I don't understand why. He said you usually use Cv (he might have offered an explanation but I didn't really hear/understand).
by ashwathinair
Sun Feb 02, 2020 11:51 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Cv vs Cp
Replies: 3
Views: 59

Cv vs Cp

How can we use Cv and Cp when looking into heat required to change the temperature of a system (qp = n(Cp/v)(DeltaT))? I know one of them is for constant volume and the other is for constant pressure, but are there calculation-based differences between the two, or are both found the exact same way?
by ashwathinair
Sun Feb 02, 2020 11:38 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Different ways to calculate change in U
Replies: 4
Views: 32

Different ways to calculate change in U

How do you calculate the change in U for different situations: constant/changing pressure, temperature, volume etc?
by ashwathinair
Sun Feb 02, 2020 8:28 pm
Forum: Calculating Work of Expansion
Topic: 4A.5
Replies: 2
Views: 49

4A.5

A piston confines 0.200 mol Ne(g) in 1.20 L at 25 8C. Two experiments are performed. (a) The gas is allowed to expand through an additional 1.20 L against a constant pressure of 1.00 atm. (b) The gas is allowed to expand reversibly and isothermally to the same final volume. Which process does more w...
by ashwathinair
Sun Feb 02, 2020 8:19 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student - Part II [ENDORSED]
Replies: 174
Views: 13380

Re: Advice from a Medical Student - Part II [ENDORSED]

Thanks so much for sharing your story with us and being open to questions! It sounds like being able to learn about disease and do some work in the hospital is a blast. I have heard a lot about medical school - namely, that it requires a lot of rote memorization - but I believe I learn better by und...
by ashwathinair
Sun Feb 02, 2020 8:15 pm
Forum: Calculating Work of Expansion
Topic: Change in Pressure vs Constant Pressure
Replies: 1
Views: 19

Change in Pressure vs Constant Pressure

In some homework questions, a pressure unit is mentioned to calculate work over some time, but there is no other pressure unit to compare it with. Are we right to assume that it should be constant pressure?
by ashwathinair
Sun Jan 26, 2020 4:46 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Types of Delta H
Replies: 3
Views: 39

Types of Delta H

I know that delta H alone is a reaction's enthalpy and that delta Hf is standard enthalpy of formation, but in one of the homework problems (4D15) I came across delta Hc; does anybody know what this means?
by ashwathinair
Wed Jan 22, 2020 7:22 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Strong Acids and Bases in Water
Replies: 1
Views: 27

Strong Acids and Bases in Water

How should we go about trying to find the pH or pOH of a solution where a strong acid or base is poured into water? Like I know the pH or pOH shouldn't change much and we don't use an ice table, but then what can we do to find the pH?
by ashwathinair
Mon Jan 20, 2020 4:29 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Percentage Protonation
Replies: 1
Views: 37

Percentage Protonation

What is the equation to find percentage protonation? What does percentage protonation measure?
by ashwathinair
Mon Jan 20, 2020 3:27 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: 6B 9
Replies: 3
Views: 58

6B 9

(a) Complete the following table. (b) Rank the four solutions in order of increasing acidity. [H3O+] [OH-] pH pOH (i) [H3O+] is 1.50 mol/L (ii) [OH-] 1.50 mol/L (iii) pH is 0.75 (iv) pOH is 0.75 When calculating pH for the first two rows, the pH and pOH were either negative or over 14. Is this possi...
by ashwathinair
Mon Jan 20, 2020 3:24 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: 6B 11
Replies: 3
Views: 67

6B 11

A student added solid Na2O to a volumetric flask of volume 200.0 mL, which was then filled with water, resulting in 200.0 mL of NaOH solution. Then 5.00 mL of the solution was transferred to another volumetric flask and diluted to 500.0 mL. The pH of the diluted solution is 13.25. (a) What is the mo...
by ashwathinair
Sun Jan 19, 2020 4:20 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Acids/Bases and Chemical Equilibrium
Replies: 2
Views: 33

Acids/Bases and Chemical Equilibrium

I understand the steps to do chemical equilibrium problems for chemical equations that aren't acids and bases; in general, what is added to the basic framework of solving regular chemical equilibrium reactions when trying to find chemical equilibria (and related pH/pOH) for acid base reactions?
by ashwathinair
Sun Jan 19, 2020 4:13 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5I 33
Replies: 2
Views: 20

5I 33

A sample of ammonium carbamate, NH4(NH2CO2), of mass 25.0 g was placed in an evacuated flask of volume 0.250 L and kept at 25 C. At equilibrium, 17.4 mg of CO2 was present. What is the value of Kc for the decomposition of ammonium carbamate into ammonia and carbon dioxide? The reaction is NH4(NH2CO2...
by ashwathinair
Sun Jan 19, 2020 4:08 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's Principle
Replies: 4
Views: 31

Le Chatelier's Principle

How can Le Chatelier's principle be applied to partial pressures?
by ashwathinair
Thu Jan 16, 2020 1:44 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Approximation
Replies: 8
Views: 65

Approximation

Can someone explain how and when we use approximation for ICE tables? Are there other situations you can use them as well? Is this only for acids and bases?
by ashwathinair
Wed Jan 15, 2020 5:02 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6A 21
Replies: 2
Views: 36

6A 21

The value of Kw for water at body temperature (37 C) is
2.1 * 10^-14. (a) What is the molar concentration of H3O+ ions at
37 C? (b) What is the molar concentration of OH- in neutral
water at 37 C?

I understand that Kw = [H3O+][OH-], but I am not sure where to go from here.
by ashwathinair
Sun Jan 12, 2020 12:41 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Factors Affecting K
Replies: 5
Views: 59

Factors Affecting K

What factors change a K value of an equilibrium reaction (other than temperature), and why?
by ashwathinair
Sun Jan 12, 2020 12:39 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE vs Normal Concentrations
Replies: 5
Views: 36

ICE vs Normal Concentrations

In what situations should we use the ICE method; in what situations should we use regular equilibrium concentrations?
by ashwathinair
Sun Jan 12, 2020 12:37 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Temperature and K
Replies: 6
Views: 75

Temperature and K

What effect does temperature have on the K value, and why does the K value change with temperature?
by ashwathinair
Sun Jan 12, 2020 12:36 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Pure substances in reactions
Replies: 2
Views: 25

Pure substances in reactions

Can there never be any reactions that only contain pure substances (purely liquid or solid)? For example, are reactions like the ones modeled below never possible? If so, why?
Solid + Solid <--> Solid
Liquid + Liquid <--> Liquid
Liquid + Solid <--> Solid + Liquid
by ashwathinair
Sun Jan 12, 2020 12:33 pm
Forum: Ideal Gases
Topic: Bars vs atmospheres
Replies: 13
Views: 88

Bars vs atmospheres

What is the difference between bars and atmospheres as units for finding Kp or Qp? Which one is used, and if it is either, why are both applicable?
by ashwathinair
Sun Dec 08, 2019 12:43 am
Forum: Air Pollution & Acid Rain
Topic: Options to reduce acid rain
Replies: 7
Views: 156

Re: Options to reduce acid rain

Riya Sood 4C wrote:Acid rain can be reduced by reducing burning of fossil fuels. Also, neutralizers like limestone can be used


is that all we have to know for the final about neutralizing acid rain? Are there any specific chemical concepts we should know behind these options to reduce acid rain?
by ashwathinair
Sun Dec 08, 2019 12:37 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Using Ka or Kb to find pKa or pKb
Replies: 2
Views: 37

Using Ka or Kb to find pKa or pKb

We have the formulas to find pKa and pKb, but if we are given an acid or base without the Ka or Kb how do we find the pKa or pKb? Or do we need to be given the Ka or Kb to find this?
by ashwathinair
Sun Dec 08, 2019 12:35 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelating Ligand
Replies: 1
Views: 89

Chelating Ligand

When we say a chelating ligand forms a ring around the central metal atom, do we mean that the metal atom is a part of the ring created? How do we know is something is a chelating ligand without knowing the drawing of it? Also, how do we know how to draw a chelating ligand knowing only the chemical ...
by ashwathinair
Sun Dec 08, 2019 12:31 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Compounds Structures
Replies: 1
Views: 94

Coordination Compounds Structures

How can we draw coordination compounds and know the VSEPR geometry of the compound? How can we tell the number of valence electrons on the transition metal in the center of the compound?
by ashwathinair
Sun Dec 08, 2019 12:26 am
Forum: Air Pollution & Acid Rain
Topic: Options to reduce acid rain
Replies: 7
Views: 156

Options to reduce acid rain

What are some ways we can reduce acid rain?
by ashwathinair
Sun Dec 08, 2019 12:23 am
Forum: Biological Examples
Topic: Important Complexes and their Biological Significance
Replies: 2
Views: 99

Important Complexes and their Biological Significance

Which complexes should we know in terms of biological significance (and which formulas should we memorize)?
by ashwathinair
Sun Dec 08, 2019 12:22 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Memorizing Ligands
Replies: 3
Views: 131

Memorizing Ligands

Which ligands should we know the formulas for by heart other than edta, en and ox?
by ashwathinair
Sat Dec 07, 2019 11:17 pm
Forum: Sigma & Pi Bonds
Topic: Hybridization Notation for Sigma and Pi Bonds
Replies: 1
Views: 88

Hybridization Notation for Sigma and Pi Bonds

How do we denote hybridization for sigma and pi bonds (something like sigma(C2sp, C2sp) or smth)?
by ashwathinair
Sat Dec 07, 2019 4:12 pm
Forum: Sigma & Pi Bonds
Topic: Sigma Vs Pi
Replies: 10
Views: 205

Sigma Vs Pi

What are the main differences between sigma and pi bonds? What do we need to know and why are these differences important?
by ashwathinair
Sun Dec 01, 2019 8:04 pm
Forum: Conjugate Acids & Bases
Topic: Ligands
Replies: 12
Views: 112

Ligands

Exactly what is a ligand, and what do we need to know about ligands from lectures for the final?
by ashwathinair
Sun Dec 01, 2019 8:03 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted Acid and Base
Replies: 5
Views: 75

Re: Bronsted Acid and Base

Yes, bronsted definitions are based on proton accepting or donating (in contrast to lewis definitions based on electron accepting and donating).
by ashwathinair
Sun Dec 01, 2019 8:00 pm
Forum: Administrative Questions and Class Announcements
Topic: Studying for final exam
Replies: 8
Views: 104

Re: Studying for final exam

I've heard that the final can be very specific, so I think studying the notes or even the textbook in depth will really help.
by ashwathinair
Sun Dec 01, 2019 7:59 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sigma Bond
Replies: 10
Views: 111

Re: Sigma Bond

Sigma bonds are always one of the (up to three) bonds in a bond between two atoms. Specifically, there is one sigma in a single bond, one sigma in a double bond and one sigma in a triple bond.
by ashwathinair
Sun Dec 01, 2019 7:57 pm
Forum: Lewis Acids & Bases
Topic: Proton acceptor and proton donor?
Replies: 33
Views: 348

Re: Proton acceptor and proton donor?

Proton acceptors are bases and proton donors are acids
by ashwathinair
Sun Nov 24, 2019 11:27 pm
Forum: Resonance Structures
Topic: Resonance and Naming
Replies: 11
Views: 248

Re: Resonance and Naming

Resonance should not affect how we name a compound. However, having different versions of the compound's composition (such as through cisplatin and transplatin) can affect naming of a compound.
by ashwathinair
Sun Nov 24, 2019 11:25 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 7
Views: 85

Re: Bond Angles

This depends on if there is greater repulsion of bonds based on polarity and lone pairs. For example, H2O has slightly less than 109.5 degrees bond angle because the lone pairs on the oxygen repel the hydrogens away from the lone pairs and closer together to each other.
by ashwathinair
Sun Nov 24, 2019 11:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2F.3
Replies: 3
Views: 32

Re: 2F.3

(a) 2 sigma bonds
(b) 2 sigma and 2 pi bonds

You can tell based on the lewis structure - single bonds are one sigma bond, double bonds are one sigma and one pi bond, and triple bonds are one sigma and two pi bonds.
by ashwathinair
Sun Nov 24, 2019 8:01 pm
Forum: Biological Examples
Topic: Cisplatin
Replies: 12
Views: 151

Re: Cisplatin

You should know cisplatin has a different structure than the trans version of the molecule because of sigma and pi bonds and the lewis structures of each.
by ashwathinair
Sun Nov 24, 2019 7:40 pm
Forum: Lewis Acids & Bases
Topic: Donor and Acceptor
Replies: 6
Views: 63

Re: Donor and Acceptor

Im pretty sure Lewis acids and bases are the same as regular acida dn bases. Lewis acids are proton donors and electron acceptors; lewis bases are proton acceptors and electron donors.
by ashwathinair
Sun Nov 17, 2019 8:15 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shapes
Replies: 6
Views: 64

Re: Molecular Shapes

I'd assume we need to memorize them all along with whatever electron configuration they go with for test 2.
by ashwathinair
Sun Nov 17, 2019 8:13 pm
Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
Topic: Rod vs spherical shaped molecules
Replies: 8
Views: 194

Re: Rod vs spherical shaped molecules

Rod-shaped molecules have stronger London dispersion bonds because they have more surface area as well as more extreme electron clumping/shifting.
by ashwathinair
Sun Nov 17, 2019 8:11 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: Boiling Points
Replies: 7
Views: 80

Re: Boiling Points

Essentially, does this mean that boiling points have a direct correlation to electronegativity? I would think that if an atom is more electronegative then there is a stronger bond and thus a higher boiling point. I would say it is more about the difference in electronegativities between atoms in a ...
by ashwathinair
Sun Nov 17, 2019 8:07 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar vs non polar
Replies: 5
Views: 44

Re: Polar vs non polar

No - polarity depends more on whether the individual polarity between atoms in a single molecule cancel out or not. You cannot just assume that all molecules with lone pairs are polar as a whole.
by ashwathinair
Sun Nov 17, 2019 8:06 pm
Forum: Hybridization
Topic: Test 2 Topics
Replies: 11
Views: 157

Re: Test 2 Topics

I'm pretty sure it's everything we covered after the midterm up until but not including hybridization.
by ashwathinair
Fri Nov 08, 2019 2:16 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: Monday Lecture
Replies: 2
Views: 50

Monday Lecture

Since we don't have school on Monday, is there anything we need to prepare for the Friday lecture or no?
by ashwathinair
Fri Nov 08, 2019 2:03 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: Hydrogen bonding specificity
Replies: 3
Views: 32

Hydrogen bonding specificity

Why do hydrogen bonds only form between N, F and O? Why do they not form with elements in lower periods?
by ashwathinair
Fri Nov 08, 2019 1:59 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: Interaction potential energy equations
Replies: 1
Views: 49

Interaction potential energy equations

Can someone explain how the interaction potential energy equations for different types of bonds work? I know that r is distance and alpha is polarizability, but how do the two interact to form the potential energy? Also, in what context would these equations be used?
by ashwathinair
Mon Nov 04, 2019 11:14 am
Forum: *Shrodinger Equation
Topic: Explanation of Shrodinger Equation and Hamiltonian
Replies: 3
Views: 165

Explanation of Shrodinger Equation and Hamiltonian

What do we need to understand conceptually about the Shrodinger equation and the Hamiltonian? How do these concepts interact, and do we need to know the equation/how to solve the Hamiltonian?
by ashwathinair
Sun Nov 03, 2019 10:35 pm
Forum: Photoelectric Effect
Topic: Dino Nuggets 8a
Replies: 1
Views: 58

Dino Nuggets 8a

At the review session on Friday, we went over 8a on the Dino Nuggets packet and found an equation derived from E(photon) = (threshold) + E(kinetic) that was equalled to frequency. Why did the equation need to be equalled to frequency? Could any other form of this equation still work to show the cons...
by ashwathinair
Fri Nov 01, 2019 7:49 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent character in ionic bonds
Replies: 3
Views: 60

Covalent character in ionic bonds

If a bond is ionic, why would it have more or less covalent character? Is this because the electron being pulled on by the cation has more or less polarizing power/the anion has more or less polarizability?
by ashwathinair
Fri Nov 01, 2019 7:46 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Distorted electrons
Replies: 2
Views: 53

Distorted electrons

Exactly what does it mean for an electron to be distorted?
by ashwathinair
Fri Nov 01, 2019 7:44 pm
Forum: Sigma & Pi Bonds
Topic: Significance of sigma and pi bonds
Replies: 4
Views: 61

Significance of sigma and pi bonds

Exactly what is a sigma and pi bond, and how do we know which molecules have which type of bond?
by ashwathinair
Fri Nov 01, 2019 7:23 pm
Forum: Octet Exceptions
Topic: What are these?
Replies: 3
Views: 55

What are these?

Exactly what are the elements that are exceptions to the octet rule?
by ashwathinair
Fri Nov 01, 2019 7:14 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge purpose
Replies: 40
Views: 2597

Re: Formal charge purpose

Compounds naturally want to be at their most stable form. By using formal charges and equalling them to 0, we are better able to find what is ACTUALLY the most stable structure of the compound so that we know what the structure of the compound actually is in nature.
by ashwathinair
Sun Oct 20, 2019 8:28 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Exceptions to Orbital Rules
Replies: 8
Views: 113

Exceptions to Orbital Rules

What are the exceptions to the orbital rules we went over in class? I vaguely remember that d5 and d10 have different energy values so their orbital sequences are different.
by ashwathinair
Sun Oct 20, 2019 8:25 pm
Forum: *Particle in a Box
Topic: Explaining Particle in a Box
Replies: 4
Views: 201

Explaining Particle in a Box

I don't know if I just didn't label it down in my notes but I am not completely sure what this experiment entails. Would someone be able to explain particle in a box to me?
by ashwathinair
Sun Oct 20, 2019 8:23 pm
Forum: *Black Body Radiation
Topic: Understanding Black Body Radiation
Replies: 5
Views: 164

Understanding Black Body Radiation

Exactly what is black body radiation, and what do I need to know about it?
by ashwathinair
Sun Oct 20, 2019 8:19 pm
Forum: Properties of Light
Topic: Wave Properties of Sound
Replies: 4
Views: 73

Wave Properties of Sound

Just curious, would wave properties such as constructive and destructive interference apply to things other than light, like sound? If so, what would be an example of that?

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