Search found 67 matches

by Angela Grant 1D
Thu Mar 14, 2019 10:33 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: catalyst vs intermediate
Replies: 9
Views: 116

Re: catalyst vs intermediate

to add to your question, how can you tell which substance is a catalyst versus an intermediate when given a series of steps?
by Angela Grant 1D
Thu Mar 14, 2019 10:31 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ice chart
Replies: 2
Views: 44

Re: ice chart

reactants are "-x" and products "+x" since the reactant is usually forming product. also you're usually given some reactant concentration and no product, so if you were to put "-x" under products you would get a negative concentration. hope this helps
by Angela Grant 1D
Thu Mar 14, 2019 10:29 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Water in cell diagram
Replies: 1
Views: 26

Re: Water in cell diagram

you don't include H2O since it's a solvent
by Angela Grant 1D
Thu Mar 14, 2019 10:28 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Ice chart coefficients
Replies: 1
Views: 35

Re: Ice chart coefficients

you put coefficients if it's in the equation. so if you have 2H+ as a product, you'd write "-2x." hope this helps
by Angela Grant 1D
Thu Mar 14, 2019 10:25 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: C in a diatomic molecule
Replies: 3
Views: 186

Re: C in a diatomic molecule

to add to your question, when do we use Cp vs Cv?
by Angela Grant 1D
Tue Mar 12, 2019 10:34 pm
Forum: Administrative Questions and Class Announcements
Topic: Sig Figs
Replies: 9
Views: 287

Re: Sig Figs

i'm not 100% sure, but i think sig figs still count. but i was told that for the midterm they wouldn't count for thermo questions. don't know if that still applies
by Angela Grant 1D
Tue Mar 12, 2019 10:30 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: exercise 11.77 6th edition
Replies: 2
Views: 52

Re: exercise 11.77 6th edition

I found this answer on an older, similar post:

"Breaking a diatomic molecule X2(g) requires energy to become 2X(g), and therefore the reaction is endothermic. This is true for other halogens as well"
by Angela Grant 1D
Tue Mar 12, 2019 10:27 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: When to add H+ and H20 to the Cell Diagram
Replies: 2
Views: 60

Re: When to add H+ and H20 to the Cell Diagram

H+ is aqueous so it's an active part of the reaction and is in the cell diagram but H2O is just a solvent so it doesn't get added into the cell diagram
by Angela Grant 1D
Mon Mar 11, 2019 10:20 pm
Forum: First Order Reactions
Topic: Integrated Rate Laws (7b.1/ 15.21)
Replies: 3
Views: 46

Re: Integrated Rate Laws (7b.1/ 15.21)

^to add on, you have to subtract the new [A] from the initial [A]. so when you use the molar ratio to get [A] when [B] = .034 mol/L, you should get [A] = .068 mol/L. then you have to subtract from the initial: .153 - .068 = .085 mol/L. this is the [A] you should use for your computation
by Angela Grant 1D
Mon Mar 11, 2019 10:13 pm
Forum: First Order Reactions
Topic: Doubling the Concentration
Replies: 4
Views: 63

Re: Doubling the Concentration

changing concentration wouldn't affect the reaction order. rate doubles because in a first order reaction, rate = k[A]. in a second order reaction, rate = k[A]^2, so if concentration were doubled the rate would increase exponentially, not double
by Angela Grant 1D
Mon Mar 11, 2019 10:10 pm
Forum: General Rate Laws
Topic: Rate definition
Replies: 3
Views: 52

Re: Rate definition

rate of a reaction depends on the rate constant (k) and some other variable (we've been working with concentration)
by Angela Grant 1D
Mon Mar 11, 2019 10:07 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Pre-Equilibrium Steps
Replies: 2
Views: 40

Re: Pre-Equilibrium Steps

we'd be given which steps are fast or slow, so we'd just have to know that the slow step is the rate-determining step
by Angela Grant 1D
Mon Mar 11, 2019 10:04 pm
Forum: General Rate Laws
Topic: Homogeneous vs Heterogeneous Reactions
Replies: 2
Views: 38

Re: Homogeneous vs Heterogeneous Reactions

homogeneous reactions have reactants and products that are all in the same phase (gas, liquid, solid, aqueous). heterogeneous reactions include more than one phase in the reaction
by Angela Grant 1D
Tue Feb 26, 2019 5:52 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 7272

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

for #4 on gibbs free energy, does it matter that the standard delta G is given in kJ instead of kJ/mol? i thought we'd have to divide by 2 to get the delta G per mole of NH3, but that didn't give me the right answer so i'm a little confused because plugging in the given value does give me the right ...
by Angela Grant 1D
Tue Feb 26, 2019 5:50 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 7272

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

On #1 of the Gibbs to find the standard enthalpy and entropy of formation you have to do the sum of products minus the sum of the reactants using the numbers given right? For some reason I am not getting the same answer. the values are given per mole, are you multiplying them by the respective mole...
by Angela Grant 1D
Tue Feb 26, 2019 5:47 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 7272

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

Madison Hurst wrote:In the Gibbs WS #4 how do you find T? or can you just assume its at 25 C?


yeah you just assume 25 C, so 298 K
by Angela Grant 1D
Mon Feb 25, 2019 7:38 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Difference in values
Replies: 2
Views: 44

Re: Difference in values

it's similar to delta H / delta H^o or delta S / delta S^o, the ^o always refers to a standard state
by Angela Grant 1D
Mon Feb 25, 2019 7:36 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams
Replies: 2
Views: 42

Re: Cell Diagrams

^to add on, within each half-reaction in a cell diagram, you'd typically write in the order of what's being reduced/oxidized. so if Ni2+ is reduced to Ni, the cell diagram for this cathode would be Ni2+(aq)|Ni(s)
by Angela Grant 1D
Mon Feb 25, 2019 7:33 pm
Forum: Balancing Redox Reactions
Topic: Test #2
Replies: 9
Views: 177

Re: Test #2

SydBenedict2H wrote:Will he ask us any acid base questions, or is he only asking Gibbs and electrochemistry?


acid base was covered in the midterm so it'll just be what's posted on his website
by Angela Grant 1D
Mon Feb 25, 2019 7:32 pm
Forum: Balancing Redox Reactions
Topic: Balancing Electrons
Replies: 3
Views: 39

Re: Balancing Electrons

^to add, if the half-reactions have different numbers of electrons, you just multiply the reactions by whatever factors will make the electrons cancel out
by Angela Grant 1D
Mon Feb 25, 2019 7:31 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Nernst Equation
Replies: 2
Views: 39

Re: Nernst Equation

yes, it's the number that cancels out when you balance a redox reaction by writing out its oxidation/reduction half-reactions
by Angela Grant 1D
Mon Feb 25, 2019 7:29 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: n value
Replies: 11
Views: 128

Re: n value

n is the number of electrons that cancel out when you write out oxidation/reduction half-reactions to get the balanced redox reaction
by Angela Grant 1D
Mon Feb 25, 2019 7:23 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Problem 6L.1
Replies: 4
Views: 101

Re: Problem 6L.1

You'd use n = 2 electrons because when you split up the half-reactions you get:

Oxid.: Ce4+ + e- --> Ce3+
Red.: 3I- --> I(3)- + 2e-

Multiply the oxidation half-reaction by 2 to balance out the electrons and cancel them out, leaving you with two electrons getting cancelled.
by Angela Grant 1D
Mon Feb 25, 2019 7:18 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 7th Edition 6L.5
Replies: 1
Views: 44

7th Edition 6L.5

This question asks for the cell diagrams of given skeletal equations. For (b) Ce4+ (aq) + I- (aq) --> I2 (s) + Ce3+ , I understand that the cell diagram would need a Pt (s) on the cathode end where Ce4+ reduces to Ce3+, so it'd be Ce4+(aq), Ce3+(aq) | Pt(s). But the answer key also has a Pt(s) on th...
by Angela Grant 1D
Tue Feb 12, 2019 5:32 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 7272

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

Jordan Lo 2A wrote:Can someone explain #4? Is this because q=0 when delta T=0, and w=0 when -PdeltaV=0?


When delta T = 0, the internal energy delta U = 0. Since delta U = q + w, if delta U = 0 then w = -q, aka the work done on the system is equal to the heat absorbed.
by Angela Grant 1D
Tue Feb 12, 2019 5:29 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 7272

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

Can someone explain how to solve 10 and 11? For 11, I used the mol(cv)(ln(t2/t1)) and am not getting the correct answer. Can someone please outline the steps to solve? For 10, use delta S = nRln(V2/V1) For 11, you need to add up two different delta S's, one for the volume change and one for the tem...
by Angela Grant 1D
Tue Feb 12, 2019 5:26 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 7272

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

Hannah Yates 1K wrote:Can someone explain 5c?


You use work = -nRTln(V2/V1). Isolate ln(V2/V1) and then solve for V2/V1 by taking e of both sides
by Angela Grant 1D
Tue Feb 12, 2019 5:24 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Replies: 179
Views: 7272

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)

can someone explain 6(d)? I tried using the additive equation for standard enthalpy of a reaction but I don't think I'm inputting the correct value for it or if that's even a possible way to get the answer
by Angela Grant 1D
Wed Jan 23, 2019 10:27 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kw - applies to solutions other than 100% water?
Replies: 3
Views: 65

Re: Kw - applies to solutions other than 100% water?

Kw implies that the solution is water since the expression represents the autoprotolysis of water
by Angela Grant 1D
Wed Jan 23, 2019 10:18 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Volume and Le Chatelier's Principle
Replies: 5
Views: 100

Re: Volume and Le Chatelier's Principle

Minimizing the effect of changing volume is dependent on what side has more moles, so if both sides are the same then there's no shift that will minimize the effect. Aka it doesn't shift left or right
by Angela Grant 1D
Wed Jan 23, 2019 9:59 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ACIDS AND BASES: What to do with very dilute acid
Replies: 2
Views: 48

Re: ACIDS AND BASES: What to do with very dilute acid

To add on, I don't think Dr. Lavelle would give us a borderline problem like that. If he did however, I'm pretty sure you still consider it negligible and add it.
by Angela Grant 1D
Wed Jan 23, 2019 9:56 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Increase in Volume Effect on Equilibrium
Replies: 6
Views: 134

Re: Increase in Volume Effect on Equilibrium

The reaction responds in such a way that minimizes the effect of a pressure change, so increasing volume (decreasing pressure) in a system with more moles on one side will favor that same side.
by Angela Grant 1D
Wed Jan 23, 2019 9:38 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Writing equations for weak acids/bases
Replies: 3
Views: 223

Re: Writing equations for weak acids/bases

We can disregard spectator ions when writing out equations with salts, but I think you should write out the entire equation for other scenarios to make sure you're noting the correct Kb / Ka values that correspond
by Angela Grant 1D
Wed Jan 23, 2019 9:36 pm
Forum: Phase Changes & Related Calculations
Topic: ∆Hsub=∆Hfus+∆Hvap
Replies: 3
Views: 59

Re: ∆Hsub=∆Hfus+∆Hvap

∆Hfus = Hliquid- Hsolid ∆Hvap = Hvapor - Hliquid ∆Hsub = Hvapor - Hsolid Since sublimation goes straight from a solid to a vapor state, it'll have the same total change as the individual changes in fusion and vaporization put together. Therefore, you can combine them all to get ∆Hsub=∆Hfus+∆Hvap Hop...
by Angela Grant 1D
Sun Jan 13, 2019 9:59 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium constant
Replies: 6
Views: 106

Re: Equilibrium constant

Technically, it affects both since pressure and concentration are related by PV=nRT --> P=(concentration)RT <--> concentration=P/RT
But yes Kp is pressure and Kc is concentration
by Angela Grant 1D
Sun Jan 13, 2019 9:47 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Effect of increased concentration on equilibrium
Replies: 9
Views: 457

Re: Effect of increased concentration on equilibrium

In addition to more products getting produced, the concentration of any other reactants in the reaction would decrease.
by Angela Grant 1D
Sun Jan 13, 2019 9:45 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Determining Which side is favored
Replies: 5
Views: 92

Re: Determining Which side is favored

Yes, since Q and K are the same ratio ([products]/[reactants]) that means the [products] would have to decrease, or the [reactants] would have to increase, in order for Q to be less than K. Therefore, there will be more reactants yielding products so that the forward reaction is favored.
by Angela Grant 1D
Thu Dec 06, 2018 10:26 pm
Forum: Lewis Acids & Bases
Topic: Strong Acids
Replies: 6
Views: 125

Re: Strong Acids

One reason that HF is a weaker acid than HI is because of the stronger bond - it is less likely to donate a proton
by Angela Grant 1D
Thu Dec 06, 2018 10:20 pm
Forum: Bronsted Acids & Bases
Topic: Glucose as an acid
Replies: 3
Views: 68

Re: Glucose as an acid

I don't think it's either actually, it's a neutral organic compound
by Angela Grant 1D
Thu Dec 06, 2018 10:12 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizing Power: Size vs. Charge
Replies: 3
Views: 258

Re: Polarizing Power: Size vs. Charge

First look at charge (greater charge corresponds to higher polarizing power) and then size (smaller atoms have higher polarizing power)
by Angela Grant 1D
Tue Nov 27, 2018 11:42 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent vs. Ionic
Replies: 2
Views: 76

Re: Covalent vs. Ionic

During one lecture Dr. Lavelle said any questions on ionic/covalent character would be pretty straightforward if we aren't given an electronegativity chart. So we can just figure it out based on how close/far apart the atoms in a molecule are on the periodic table.
by Angela Grant 1D
Tue Nov 27, 2018 11:34 pm
Forum: Hybridization
Topic: sigma and pi bonds
Replies: 5
Views: 108

sigma and pi bonds

what makes sigma bonds weaker than pi bonds?
by Angela Grant 1D
Tue Nov 27, 2018 11:25 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 3
Replies: 38
Views: 685

Re: Test 3

Ashley P 4I wrote:Does anyone have a trick to memorizing all these things?


I made a big chart to study off of, you can find one online if you just search up VSEPR geometries
by Angela Grant 1D
Tue Nov 27, 2018 11:21 pm
Forum: Hybridization
Topic: S- Character
Replies: 1
Views: 40

Re: S- Character

s-character is how much of a hybrid orbital is made up of the s orbital (ie sp = 50%, sp2 = 33%, sp3= 25%, etc.)

increasing s-character is basically decreasing the number of bonds, which allows for more space between bonds, therefore increasing bond angles.
by Angela Grant 1D
Tue Nov 27, 2018 11:13 pm
Forum: Resonance Structures
Topic: Bond lengths & number of resonance structures
Replies: 3
Views: 262

Re: Bond lengths & number of resonance structures

A molecule's structure is an average of all resonance structures so the bond lengths would be an average
by Angela Grant 1D
Tue Nov 27, 2018 11:08 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Seesaw Shape Bond Angles
Replies: 8
Views: 138

Re: Seesaw Shape Bond Angles

The VSEPR formula for seesaw is AX4E, so the 4 bonding groups and single lone pair result in <120 equatorial <90 axial
by Angela Grant 1D
Wed Nov 14, 2018 3:56 pm
Forum: Properties of Electrons
Topic: Polar vs Non polar
Replies: 15
Views: 552

Re: Polar vs Non polar

This is what my high school chem teacher taught us: "A molecule with a uniform distribution of electron density is nonpolar; and one with an asymmetrical distribution is polar. A molecule is nonpolar only if it has no lone pair electrons about the central atom and all groups attached to the cen...
by Angela Grant 1D
Wed Nov 14, 2018 3:54 pm
Forum: Administrative Questions and Class Announcements
Topic: Grades
Replies: 5
Views: 173

Grades

Does anyone know how the grading scale works for Dr. Lavelle's class? Is it on a curve or does each letter grade correspond to a specific and fixed percentage range?
by Angela Grant 1D
Wed Nov 14, 2018 3:46 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Question 4.5 (Determining shape from Lewis structure)
Replies: 2
Views: 46

Re: Question 4.5 (Determining shape from Lewis structure)

When you draw the Lewis structure, you can determine the number of bonding pair and lone pair electrons. You can then create a VSEPR formula which corresponds to a particular shape. For example, a formula of AX3 corresponds to a trigonal planar shape.
by Angela Grant 1D
Thu Nov 08, 2018 6:31 pm
Forum: Electronegativity
Topic: Electronegativity Calculation
Replies: 5
Views: 109

Re: Electronegativity Calculation

In the book the equation for electronegativity is given as the average of ionization energy and electron affinity. But in lecture Dr. Lavelle said we'd just be given the table of values if we need to use them on a test so we probably don't need the equation
by Angela Grant 1D
Thu Nov 08, 2018 6:28 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic vs Covalent Bonds
Replies: 18
Views: 496

Re: Ionic vs Covalent Bonds

The book states that most bonds are somewhere in between purely covalent and purely ionic. When depicting these bonds, how does one know when to depict a bond as ionic or covalent when it is in this in between state? The book uses a rough guideline in which a difference in electronegativity greater...
by Angela Grant 1D
Thu Nov 08, 2018 6:22 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability
Replies: 3
Views: 57

Polarizability

Can someone explain the relationship between number of electrons and polarizability?
by Angela Grant 1D
Wed Oct 31, 2018 7:16 pm
Forum: Quantum Numbers and The H-Atom
Topic: Spin Magnetic Quantum Number
Replies: 6
Views: 399

Re: Spin Magnetic Quantum Number

I think as the electrons fill an orbital they take a +1/2 spin, then as the become paired they take -1/2 spin.
by Angela Grant 1D
Wed Oct 31, 2018 7:09 pm
Forum: Octet Exceptions
Topic: Expanded Valence Shells
Replies: 2
Views: 96

Re: Expanded Valence Shells

You are right about any atom with n=3 or higher being able to have an expanded valence shell. Dr. Lavelle mentioned that this applies to atoms in periods 3 and higher.
by Angela Grant 1D
Wed Oct 31, 2018 7:06 pm
Forum: Trends in The Periodic Table
Topic: Electron affinity
Replies: 2
Views: 71

Re: Electron affinity

Electron affinity is the energy released when an electron is added to a gas-phase atom. You can think of it as how much an atom attracts an electron. On the periodic table, it is highest on the upper right (with the exception of noble gases since they have full valence shells).
by Angela Grant 1D
Wed Oct 24, 2018 9:00 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: electron configurations
Replies: 1
Views: 61

Re: electron configurations

I believe it's because the f block starts right after the s block at period 6, so it doesn't include the d block until after the lanthanide series ends.
by Angela Grant 1D
Wed Oct 24, 2018 8:52 pm
Forum: Quantum Numbers and The H-Atom
Topic: Electron Configuration Order
Replies: 2
Views: 52

Re: Electron Configuration Order

The 3d orbital actually comes before 4s because it has lower energy, and the electron configuration is written from lowest to highest energy. For example, scandium's electron configuration is [Ar]3d(1)4s(2), not [Ar]4s(2)3d(1).
by Angela Grant 1D
Wed Oct 24, 2018 8:48 pm
Forum: Quantum Numbers and The H-Atom
Topic: Electron Spin
Replies: 3
Views: 67

Re: Electron Spin

I believe for the ground state electron configuration of an atom, the convention is to fill orbitals with +1/2 spin and then go back to pair electrons with a -1/2 spin.
by Angela Grant 1D
Wed Oct 17, 2018 4:31 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Nodal Planes
Replies: 3
Views: 62

Re: Nodal Planes

Remember that electron density is the probability of an electron being present in that region. So since nodal planes approach 0, there is no chance of an electron being found there (aka the electron density = 0).

Also, the number of nodal planes increases per orbital (s = 0, p = 1, d = 2, f = 3).
by Angela Grant 1D
Wed Oct 17, 2018 4:25 pm
Forum: Properties of Light
Topic: Homework Problem
Replies: 2
Views: 48

Re: Homework Problem

You have to know that the UV spectrum includes the Lyman series, in which n1 = 1. Using the given wavelength, you can find frequency. Then you isolate n2 in Rydberg's formula and plug in all your values to find the final energy level.
by Angela Grant 1D
Wed Oct 17, 2018 4:20 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Differentiating Orbitals
Replies: 2
Views: 50

Re: Differentiating Orbitals

Where the orbitals lie also depend on their lobe orientation. For example the d-orbital can have lobes either on xy- yz- zx- planes, the x & y axes, or the xy-plane. So it varies within each orbital
by Angela Grant 1D
Thu Oct 11, 2018 8:33 pm
Forum: Administrative Questions and Class Announcements
Topic: Homework Week 2
Replies: 5
Views: 134

Re: Homework Week 2

Yeah that's fine, since we haven't finished covering the quantum world
by Angela Grant 1D
Thu Oct 11, 2018 8:28 pm
Forum: Empirical & Molecular Formulas
Topic: Is it possible for the Empirical and Molecular formula to be the same? [ENDORSED]
Replies: 8
Views: 300

Re: Is it possible for the Empirical and Molecular formula to be the same? [ENDORSED]

It is possible! Take H2O for example. The formula can't get any simpler, so it is both the molecular and empirical formula of water.
by Angela Grant 1D
Thu Oct 11, 2018 8:12 pm
Forum: Properties of Electrons
Topic: Emission vs Absorption
Replies: 4
Views: 87

Re: Emission vs Absorption

When an atom absorbs a photon, the energy from the photon sends the electron to a higher energy level. The electron emits energy in the form of light when it returns to its ground state.
by Angela Grant 1D
Wed Oct 03, 2018 4:07 pm
Forum: Significant Figures
Topic: sig fig for avogadros number
Replies: 3
Views: 85

Re: sig fig for avogadros number

Since the textbook uses 6.022*10^23, it would probably be better to use that value so your answers can be more precise and line up with the textbook answers. In addition, it is a constant value so its sig figs are not dependent on other components of the problem.
by Angela Grant 1D
Wed Oct 03, 2018 3:59 pm
Forum: General Science Questions
Topic: Finding Molecular Formula, Mass Percentage
Replies: 2
Views: 98

Re: Finding Molecular Formula, Mass Percentage

Mass percentage is not necessary in this problem because you are already given the amount of each reactant with respect to the sample. You can use this information to set up ratios of mass of element per mass of sample (leaving you with grams), then divide by molar mass (leaving you with moles) in o...
by Angela Grant 1D
Wed Oct 03, 2018 3:46 pm
Forum: Balancing Chemical Reactions
Topic: Combustion Reactions.
Replies: 8
Views: 256

Re: Combustion Reactions.

In response to the most recent comment: no, it does not matter which order products or reactants are written in, as long as they are on their respective sides of the chemical equation (reactants on left, products on right)

So the equation can be written as C6H6 + O2-> H2O + CO2

Go to advanced search