Search found 60 matches

by Aidan Ryan 1B
Fri Mar 15, 2019 1:29 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Buffers
Replies: 4
Views: 38

Re: Buffers

What equations will we use for buffer questions.
by Aidan Ryan 1B
Fri Mar 15, 2019 1:17 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: reduction is more positive Ecell
Replies: 1
Views: 10

Re: reduction is more positive Ecell

I think so. Use E(cathode)-E(anode) and find which combo will be positive.
by Aidan Ryan 1B
Fri Mar 15, 2019 1:13 pm
Forum: Balancing Redox Reactions
Topic: Balanced Half Reactions
Replies: 5
Views: 20

Re: Balanced Half Reactions

Today in lecture I think he said balanced half reaction includes the balancing with e- being equal.
by Aidan Ryan 1B
Fri Mar 08, 2019 10:46 am
Forum: Second Order Reactions
Topic: Final
Replies: 30
Views: 241

Re: Final

Often questions are from chem community so look at those too
by Aidan Ryan 1B
Fri Mar 08, 2019 10:42 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: Order of the Reaction
Replies: 3
Views: 24

Re: Order of the Reaction

What are the Y axis 0th through 2nd order?
by Aidan Ryan 1B
Fri Mar 08, 2019 10:20 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Water in a cell diagram
Replies: 5
Views: 47

Re: Water in a cell diagram

No I don't think so. Also where would gaseous water be in a galvanic cell?
by Aidan Ryan 1B
Mon Mar 04, 2019 3:26 pm
Forum: Zero Order Reactions
Topic: 7th editon 7A.3 Example
Replies: 1
Views: 34

Re: 7th editon 7A.3 Example

Are the units changed in the answers?
by Aidan Ryan 1B
Mon Mar 04, 2019 3:25 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Delta G rules
Replies: 8
Views: 76

Re: Delta G rules

using the equation delta G=deltaH-T(delta S)
by Aidan Ryan 1B
Tue Feb 19, 2019 1:07 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Midterm Grades
Replies: 35
Views: 327

Re: Midterm Grades

"does anyone know when Test 3 is???"
It is test 2 and is during your discussion next week
by Aidan Ryan 1B
Tue Feb 19, 2019 1:03 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Reversible vs irreversible
Replies: 5
Views: 61

Reversible vs irreversible

What would a reversible rxn look like in real life vs an irreversible?
by Aidan Ryan 1B
Tue Feb 19, 2019 12:54 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Delta G a state function?
Replies: 23
Views: 169

Re: Delta G a state function?

What are things we have learned that are not state functions?
by Aidan Ryan 1B
Tue Feb 19, 2019 12:52 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Activation energy
Replies: 8
Views: 84

Re: Activation energy

Hey! What is kinetic control?
by Aidan Ryan 1B
Tue Feb 19, 2019 12:50 pm
Forum: General Rate Laws
Topic: test 3
Replies: 6
Views: 80

Re: test 3

Gibbs free energy and electrochemistry according to the website
by Aidan Ryan 1B
Tue Feb 19, 2019 12:47 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: K=e^lnK
Replies: 4
Views: 51

Re: K=e^lnK

Just wondering where did you find this?...
by Aidan Ryan 1B
Mon Feb 11, 2019 2:07 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond enthalpies
Replies: 10
Views: 67

Re: Bond enthalpies

This equation is BE of reactants- BE of products right?
by Aidan Ryan 1B
Mon Feb 11, 2019 1:57 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Question 8.53 (Sixth Edition)
Replies: 2
Views: 36

Re: Question 8.53 (Sixth Edition)

I think you'll use q=gCΔT
by Aidan Ryan 1B
Mon Feb 11, 2019 1:49 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 3/2 R and 5/2 R
Replies: 3
Views: 35

Re: 3/2 R and 5/2 R

The different values relate to what it is (atom, linear/ nonlinear molecule) and it is used in an change in entropy equation nCpln(T2/T1)
by Aidan Ryan 1B
Sun Feb 03, 2019 7:33 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: 8.49 6th edition
Replies: 1
Views: 27

Re: 8.49 6th edition

298K is standard conditions for enthalpy
by Aidan Ryan 1B
Sun Feb 03, 2019 7:31 pm
Forum: Calculating Work of Expansion
Topic: Free expansion
Replies: 3
Views: 34

Re: Free expansion

A Box with one side full of gas where suddenly the divider is moved and gas expands throughout the box. That is free expansion.
by Aidan Ryan 1B
Sun Feb 03, 2019 7:27 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: What is pKa and Ka exactly?
Replies: 11
Views: 88

Re: What is pKa and Ka exactly?

pKa is used to describe acids. Lower pKa= stronger.
Ka is the acid dissociation constant. -logKa=pKa
by Aidan Ryan 1B
Sat Jan 26, 2019 8:18 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess' Law Confirmation
Replies: 3
Views: 43

Re: Hess' Law Confirmation

If you do the stuff described about combining two equations and canceling out are you able to write 1 equation with all of this and denote this someway?
by Aidan Ryan 1B
Sat Jan 26, 2019 8:14 pm
Forum: Phase Changes & Related Calculations
Topic: Internal Energy
Replies: 3
Views: 56

Re: Internal Energy

I am not sure but I do know that U can be negative so I assume you would keep it negative if it is, to find the other values.
by Aidan Ryan 1B
Sat Jan 26, 2019 8:07 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE Box Ratios
Replies: 8
Views: 71

Re: ICE Box Ratios

What do you mean by ratios? As in Products/ Reactants? -x is how much product has been taken away.
by Aidan Ryan 1B
Thu Jan 17, 2019 10:10 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ATP hydrolysis
Replies: 1
Views: 38

Re: ATP hydrolysis

The rule about direction, as far as I remember, is when the Kq is compared to Kc. The 10^-3 rule is about strong acids/ bases and disassociation.
by Aidan Ryan 1B
Thu Jan 17, 2019 10:08 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Relationship between pH and pKa
Replies: 2
Views: 47

Re: Relationship between pH and pKa

They both tell you how acidic a compound is
by Aidan Ryan 1B
Thu Jan 17, 2019 9:57 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kw and water
Replies: 2
Views: 38

Re: Kw and water

It is the addition of the Ka and Kb. It is used to solve for these.
by Aidan Ryan 1B
Thu Jan 10, 2019 5:18 pm
Forum: Ideal Gases
Topic: p. 170 Effusion Equations
Replies: 1
Views: 80

Re: p. 170 Effusion Equations

The final equation is a combination of Grahams Law and the equation that Average Speed is directly proportional to the √ (T) (temperature). Since both equal the same thing they can be combined into the same equation which is the Average Speed= √ (T/M)
by Aidan Ryan 1B
Thu Jan 10, 2019 5:03 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium composition
Replies: 2
Views: 27

Re: Equilibrium composition

You just subtract the equilibrium conc from the initial and you have the change in molarity of ATP. You can use this to find the expected equilibrium concentration for ADP and Pi because you know the ATP breaks down into the other two. Because the change was so close to all of the ATP the number is ...
by Aidan Ryan 1B
Thu Jan 10, 2019 10:52 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K
Replies: 4
Views: 47

Re: K

Kp is for pressure, Kc is molarity and I guess Keq is just in equilibrium.
by Aidan Ryan 1B
Thu Dec 06, 2018 11:44 pm
Forum: Bronsted Acids & Bases
Topic: Strength
Replies: 1
Views: 24

Re: Strength

Well if the oxidation state of a cation is larger (ie 2+) then it could have 2 OH- which in turn would make it a stronger base and vice versa involving the # of H+ on more negatively charged anions.
by Aidan Ryan 1B
Thu Dec 06, 2018 11:35 pm
Forum: Lewis Structures
Topic: Lewis Structure of CO
Replies: 3
Views: 51

Re: Lewis Structure of CO

Using a double bond I assume carbon had more than 4 lone pair e- around the carbon if I am not mistaken. Along with the double bond the FC would be -2. This would not be preferred.
by Aidan Ryan 1B
Thu Dec 06, 2018 11:29 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 Point
Replies: 4
Views: 144

Re: Boiling Point

The compound with stronger electronegativity will have a higher boiling point because the intermolecular forces will be stronger.
by Aidan Ryan 1B
Thu Nov 29, 2018 2:21 pm
Forum: Hybridization
Topic: 2F.7 7th Edition
Replies: 2
Views: 37

Re: 2F.7 7th Edition

Draw the lewis structure and count the lone pairs as a region of electron density (essentially an atom when writing hybridization).
by Aidan Ryan 1B
Thu Nov 29, 2018 2:19 pm
Forum: Naming
Topic: ligands
Replies: 2
Views: 39

Re: ligands

Ligands are the molecules that bind on to the central atom in a coordinate covalent structure. You name them by looking up their names in the textbook chart.
by Aidan Ryan 1B
Tue Nov 27, 2018 11:07 am
Forum: Naming
Topic: Naming Ligands
Replies: 2
Views: 37

Naming Ligands

How do we know when the ligand changes names such as NH3 (ammonia) to ammine. Also how do we know the names of ligands in general?
by Aidan Ryan 1B
Thu Nov 22, 2018 6:15 pm
Forum: Hybridization
Topic: Hybridization and drawing
Replies: 3
Views: 39

Hybridization and drawing

Can hybridization help with drawing or do you have to draw the vsepr structure before figuring out the hybridization?
by Aidan Ryan 1B
Thu Nov 22, 2018 6:10 pm
Forum: Administrative Questions and Class Announcements
Topic: 14B and 14BL finals
Replies: 3
Views: 80

Re: 14B and 14BL finals

If you take 14 BL I think you should be solid on the 14 B material because you will begin learning the 14 B topics earlier in 14BL according to Lavelle.
by Aidan Ryan 1B
Thu Nov 22, 2018 6:05 pm
Forum: Dipole Moments
Topic: Dispersion Forces vs Van der Waals Reactions
Replies: 2
Views: 64

Re: Dispersion Forces vs Van der Waals Reactions

What we have learned is that van deer Waals is caused by small dipole dipole interactions between molecules. The term London forces is the same thing.
by Aidan Ryan 1B
Thu Nov 15, 2018 10:35 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Effect of Molecular Shape on Lewis Structure
Replies: 3
Views: 31

Re: Effect of Molecular Shape on Lewis Structure

I think it is important to especially when lone pairs are included. However I don't think the drawings need to be 3D.
by Aidan Ryan 1B
Thu Nov 15, 2018 10:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Double/Triple Bonds
Replies: 5
Views: 95

Re: Double/Triple Bonds

In reality I think that they do force the other bonds away b/c there are more e- in the area but we haven't talked about this in class so I am not completely sure.
by Aidan Ryan 1B
Thu Nov 15, 2018 10:13 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Trigonal Planar
Replies: 5
Views: 46

Re: Trigonal Planar

If a central atom has two atoms around it and a third area with double bonds, what would the angles be in this? 120 or would It be different due to the lone pair?
by Aidan Ryan 1B
Thu Nov 08, 2018 11:19 pm
Forum: Electronegativity
Topic: Electronegativity and Polarizability
Replies: 4
Views: 87

Re: Electronegativity and Polarizability

On a similar note, what is polarizing power compared to polarizability. Also are these only for ions?
by Aidan Ryan 1B
Thu Nov 08, 2018 11:13 pm
Forum: Bond Lengths & Energies
Topic: Bond Energy
Replies: 2
Views: 37

Re: Bond Energy

Yeah you should be given the values to compare if needed
by Aidan Ryan 1B
Thu Nov 08, 2018 5:45 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic Solubility
Replies: 2
Views: 37

Re: Ionic Solubility

Well at least part of it may be due to the electronegativity of the halogens. The more electronegative the element the more soluble it is so it could make it in general a more soluble compound.
by Aidan Ryan 1B
Thu Nov 01, 2018 11:09 pm
Forum: Ionic & Covalent Bonds
Topic: octet rule
Replies: 11
Views: 144

Re: octet rule

Hey guys. Why do some elements fill the 4s orbital to only halfway and then go to the D orbital until its filled.
by Aidan Ryan 1B
Thu Nov 01, 2018 11:08 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge purpose
Replies: 33
Views: 874

Re: Formal charge purpose

abbydouglas3J
The formal charge is to determine which lewis structure is the most accurate. Whichever has the closest value to 0 is what you use.
by Aidan Ryan 1B
Tue Oct 30, 2018 2:29 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: How to do e- configuration shorthand?
Replies: 3
Views: 49

How to do e- configuration shorthand?

When given an ion such as Tl^3+, how do you do shorthand electron configuration for this considering it would have the same e- count as Xe. Do you just put [Xe] or do you do you start at [Kr]?
by Aidan Ryan 1B
Fri Oct 26, 2018 12:26 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: pauli exclusion
Replies: 3
Views: 59

Re: pauli exclusion

About naming electrons... How do we label individual e- in d orbital that are the 1st or last when doing e-(y), e-(x), e-(z) as in the p orbital. Does it go v, w, x, y, z or does it work differently?
by Aidan Ryan 1B
Fri Oct 26, 2018 12:23 am
Forum: DeBroglie Equation
Topic: Measurable wavelength properties
Replies: 5
Views: 141

Re: Measurable wavelength properties

He is asking whether any wavelike properties would be visible in the cars movement (everything has wavelike movement). I don't remember the exact answer but there will not be any measurable wavelength properties for anything even close to that big.
by Aidan Ryan 1B
Wed Oct 24, 2018 4:12 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Ground vs Excited State
Replies: 3
Views: 75

Ground vs Excited State

If two electrons are in the same orbital when other orbitals are still empty in that sub shell, (such as 2p containing two e- but they are both in the same orbital) is this considered ground state or excited state. This is from part A of question 1E 7 of 7th edition.
by Aidan Ryan 1B
Thu Oct 18, 2018 8:57 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Wave Function v. Orbital
Replies: 3
Views: 40

Re: Wave Function v. Orbital

If I understand this right, a wave function is used to describe how an electron acts inside an atomic orbital.
by Aidan Ryan 1B
Thu Oct 18, 2018 8:49 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Problem ID.11
Replies: 3
Views: 39

Re: Problem ID.11

re: How do you figure out how many orbitals are subshells with l equal to a specific value? I am a little confused by your question. However l is the essentially and value less than the n and greater than or equal to 0. For example if n=3 then l can be 0,1 or 2. Inside sub shells are orbitals. For e...
by Aidan Ryan 1B
Thu Oct 18, 2018 10:35 am
Forum: Photoelectric Effect
Topic: 1B.25
Replies: 2
Views: 48

Re: 1B.25

Use Heisenbergs Uncertainty Principle. Use the equation ΔP=mΔv to plug into Heisenbergs for ΔP and you get mΔvΔx=h/4pi
Solve for Δv and you get your answer. The given value is your Δx.
by Aidan Ryan 1B
Thu Oct 11, 2018 12:36 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty Principle
Replies: 5
Views: 88

Re: Uncertainty Principle

It gives you measurements on the location and momentum of subatomic particles. You are looking at which of these two measurements is well known because the other will not be due to the fact that the product of these values has to be higher than a constant.
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by Aidan Ryan 1B
Thu Oct 11, 2018 12:30 pm
Forum: Properties of Light
Topic: Wavelength
Replies: 10
Views: 84

Re: Wavelength

For equations, the units need to be the same. For your answer however I think either is fine. In lecture I remember him saying nanometers are easier to understand but it doesn't really make a difference.
by Aidan Ryan 1B
Thu Oct 11, 2018 11:53 am
Forum: Properties of Electrons
Topic: Atomic spectra
Replies: 5
Views: 77

Re: Atomic spectra

We are able to identify different elements through spectroscopy analysis due to the fact that all elements emit different wavelengths of light. If we look at the wavelengths emitted from some element we can see spectral lines at these wavelengths which are unique to the element and we can identify w...
by Aidan Ryan 1B
Fri Oct 05, 2018 7:11 am
Forum: Limiting Reactant Calculations
Topic: When to use H vs H2
Replies: 7
Views: 103

When to use H vs H2

One thing I am struggling to figure out is if I have 1 mol of Hydrogen gas (H2) is that the same (in terms of atoms of Hydrogen) as having 1 mol of Hydrochloric Acid (HCL)? Its been on my mind and on some questions I struggled to know which molar mass to use (as in 1.008 or double that) when given H...
by Aidan Ryan 1B
Thu Oct 04, 2018 4:25 pm
Forum: Empirical & Molecular Formulas
Topic: Fundamental L.39
Replies: 6
Views: 66

Re: Fundamental L.39

@Noh_Jasmine_1G Oxygen in its gaseous state is always O2 however if bonded to a substance it does not. I think when others wrote about oxygen they may have been talking about the molar mass of oxygen which is needed not about oxygen gas (which has a mass of 32g). Hope that helps
by Aidan Ryan 1B
Thu Oct 04, 2018 11:06 am
Forum: SI Units, Unit Conversions
Topic: Naming Compounds
Replies: 9
Views: 164

Re: Naming Compounds

Replying to haleyervin7. The elements themselves are either solids, liquids or gasses at STP. For compounds in a single or double displacement you can assume they are in water I believe unless otherwise stated. From that if you know if the salt is soluble it is aqueous and if insoluble its a solid. ...

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