Search found 100 matches

by Maya Beal Dis 1D
Thu Mar 12, 2020 1:39 pm
Forum: Administrative Questions and Class Announcements
Topic: Take Home Final
Replies: 16
Views: 275

Re: Take Home Final

I am guessing it will be more than the three hour period because we will most likely need to print out a sheet and upload it and everything.
by Maya Beal Dis 1D
Tue Mar 10, 2020 9:49 pm
Forum: Administrative Questions and Class Announcements
Topic: ENDGAME Review Session
Replies: 71
Views: 2746

Re: ENDGAME Review Session

Are all review sessions going to be cancelled?
by Maya Beal Dis 1D
Tue Mar 10, 2020 9:48 pm
Forum: Administrative Questions and Class Announcements
Topic: Email Announcement
Replies: 8
Views: 218

Re: Email Announcement

Is it possible he will have us take the final in small group settings on campus or are we okay to go home and assume everything for the rest of the quarter can be completed online?
by Maya Beal Dis 1D
Tue Mar 10, 2020 9:46 pm
Forum: Balancing Redox Reactions
Topic: Test 2 Return
Replies: 20
Views: 341

Re: Test 2 Return

Will there be a way for us to get them back and review them before the final?
by Maya Beal Dis 1D
Wed Mar 04, 2020 7:26 pm
Forum: Balancing Redox Reactions
Topic: Physical state
Replies: 6
Views: 87

Re: Physical state

I think the states would be the same you are just balancing the coefficients based on the number of electrons transferred so the electrons are equal in each reaction.
by Maya Beal Dis 1D
Wed Mar 04, 2020 7:25 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Nernst
Replies: 10
Views: 143

Re: Nernst

If you are using the shortcut E=E(naught)-(0.05916/n)logQ, you need to use log. I think there is another number shortcut if you are using the equation with natural log.
by Maya Beal Dis 1D
Wed Mar 04, 2020 7:21 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Galvanic Cell
Replies: 2
Views: 50

Re: Galvanic Cell

How do you know when an inert electrode is needed in a galvanic cell?
by Maya Beal Dis 1D
Wed Mar 04, 2020 7:20 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Variables
Replies: 3
Views: 40

Re: Variables

In the equation lnK=nFE/RT, which value do you use for R and how do the units cancel out?
by Maya Beal Dis 1D
Wed Mar 04, 2020 7:18 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Concentration Cell
Replies: 7
Views: 77

Re: Concentration Cell

The standard cell potential in a concentration cell is zero because the two half cells would be identical under standard conditions.
by Maya Beal Dis 1D
Tue Feb 25, 2020 7:19 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Test 2
Replies: 13
Views: 112

Re: Test 2

Will the first page of thermodynamics not be on test 2?
by Maya Beal Dis 1D
Tue Feb 25, 2020 7:17 pm
Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
Topic: Recharging Batteries [ENDORSED]
Replies: 10
Views: 631

Re: Recharging Batteries [ENDORSED]

A battery dying or being used is releasing energy and therefore favorable, so the reverse reaction (charging the battery) would not be favorable.
by Maya Beal Dis 1D
Tue Feb 25, 2020 7:16 pm
Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
Topic: Porous Disk and Salt Bridge
Replies: 13
Views: 469

Re: Porous Disk and Salt Bridge

In lecture didn't Lavelle say that the voltage is typically lower with the porous disk in a concentration cell?
by Maya Beal Dis 1D
Tue Feb 25, 2020 7:15 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: G(not) and G
Replies: 15
Views: 154

Re: G(not) and G

In problem 5G.13 you calculate the delta G of the reaction at equilibrium and then use whether that value is positive or negative to see which way the reaction will proceed (towards reactants or products), but if the reaction is at equilibrium doesn't that mean the reaction is going both ways at the...
by Maya Beal Dis 1D
Thu Feb 20, 2020 4:00 pm
Forum: Balancing Redox Reactions
Topic: Test 2 [ENDORSED]
Replies: 12
Views: 143

Re: Test 2 [ENDORSED]

Does this mean that material covered before the midterm will not be on test 2 at all?
by Maya Beal Dis 1D
Thu Feb 20, 2020 4:00 pm
Forum: Balancing Redox Reactions
Topic: oxidation numbers
Replies: 8
Views: 64

Re: oxidation numbers

The charge of a molecule is always equal to the sum of the oxidation numbers multiplied by the amount of each element, so you can use the net charge to determine oxidation numbers.
by Maya Beal Dis 1D
Thu Feb 20, 2020 3:57 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Extensive and Intensive Properties
Replies: 12
Views: 217

Re: Extensive and Intensive Properties

Extensive properties include volume, mass, and weight. Intensive properties include temperature, boiling point, and color.
by Maya Beal Dis 1D
Thu Feb 20, 2020 3:55 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Adiabatic systems
Replies: 11
Views: 185

Re: Adiabatic systems

An adiabatic system is defined as a system in which no heat transfer can take place so q is zero.
by Maya Beal Dis 1D
Thu Feb 20, 2020 3:53 pm
Forum: Balancing Redox Reactions
Topic: Oxidation Numbers
Replies: 5
Views: 51

Re: Oxidation Numbers

The sum of the oxidation numbers in a molecule must equal the overall charge.
by Maya Beal Dis 1D
Thu Feb 13, 2020 10:47 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: adiabatic
Replies: 19
Views: 291

Re: adiabatic

Would this mean that the change in enthalpy for an adiabtic process is also zero?
by Maya Beal Dis 1D
Thu Feb 13, 2020 10:46 am
Forum: Student Social/Study Group
Topic: Number of Chemistry Community Posts
Replies: 33
Views: 718

Re: Number of Chemistry Community Posts

When are the posts due every week? Is it Friday or Sunday?
by Maya Beal Dis 1D
Thu Feb 13, 2020 10:45 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Spontaneous
Replies: 23
Views: 357

Re: Spontaneous

It delta G is positive it means the reaction is spontaneous in the reverse direction.
by Maya Beal Dis 1D
Thu Feb 13, 2020 10:44 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Why are exothermic reactions generally spontaneous?
Replies: 16
Views: 225

Re: Why are exothermic reactions generally spontaneous?

A very general explanation is that systems tend to want to be in the lowest energy state and when a reaction is exothermic it loses energy as heat.
by Maya Beal Dis 1D
Thu Feb 13, 2020 10:42 am
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Isobaric systems
Replies: 16
Views: 195

Re: Isobaric systems

Isobaric is constant pressure, isochoric is constant volume, and isothermal is constant temperature.
by Maya Beal Dis 1D
Tue Feb 04, 2020 10:49 am
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Extensive Property
Replies: 4
Views: 36

Re: Extensive Property

You can tell that heat capacity is an extensive property because the units are Joule/Kelvin. Because there is no mass value in the units, it is not dependent on the amount of substance present. The units for specific heat are Joule/gram*Kelvin which do include mass values and are therefore dependent...
by Maya Beal Dis 1D
Tue Feb 04, 2020 10:45 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 4D.7
Replies: 2
Views: 38

4D.7

My solutions manual shows the way to solve this problem is by using the equation U=H+nRT, but no value for temperature is given in the problem. The solutions guide uses the value of 298 K for the temperature. Will there ever be an instances on the midterm where we will need to assume standard temper...
by Maya Beal Dis 1D
Tue Feb 04, 2020 10:41 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpy
Replies: 7
Views: 63

Re: Enthalpy

Do we need to memorize the table in the textbook that tells you which fraction to multiply R by based on if the reactant is an atom or molecule and so forth?
by Maya Beal Dis 1D
Tue Feb 04, 2020 10:39 am
Forum: Phase Changes & Related Calculations
Topic: supercooling
Replies: 1
Views: 34

supercooling

Why does supercooling and superheating occur and will we need to be able to explain it on the midterm?
by Maya Beal Dis 1D
Tue Feb 04, 2020 10:39 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: reversible v irreversible work
Replies: 3
Views: 49

reversible v irreversible work

What is the difference between reversible and irreversible work and how can you tell by looking at an experiment whether it is reversible or not?
by Maya Beal Dis 1D
Wed Jan 29, 2020 3:38 pm
Forum: Ideal Gases
Topic: non ideal gases
Replies: 8
Views: 90

Re: non ideal gases

Almost all gases that you use in an experiment would be non-ideal, but it is easier to do calculations with ideal gases.
by Maya Beal Dis 1D
Wed Jan 29, 2020 3:37 pm
Forum: Phase Changes & Related Calculations
Topic: Why does steam cause burns?
Replies: 29
Views: 256

Re: Why does steam cause burns?

Why is the enthalpy larger? Aren't the same type of bonds being broken?
by Maya Beal Dis 1D
Wed Jan 29, 2020 3:36 pm
Forum: Phase Changes & Related Calculations
Topic: sig figs
Replies: 6
Views: 55

Re: sig figs

When adding and subtracting you round to the value place of whichever component has the largest value for it's significant figures, where in multiplication and division you count the number of significant figures and ignore their place values.
by Maya Beal Dis 1D
Wed Jan 29, 2020 3:34 pm
Forum: Phase Changes & Related Calculations
Topic: Calorimeter
Replies: 5
Views: 57

Re: Calorimeter

A bomb calorimeter is an example of an isolated system because no energy or matter can be lost or gained.
by Maya Beal Dis 1D
Wed Jan 29, 2020 3:33 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Temperature
Replies: 6
Views: 92

Re: Temperature

So is an ice cube melting an example of an exothermic or endothermic reaction? Because the temperature of the water final is greater than the initial temperature and the difference would therefore be positive is it an endothermic reaction?
by Maya Beal Dis 1D
Thu Jan 23, 2020 9:04 am
Forum: Ideal Gases
Topic: Inert Gases and Equilibrium
Replies: 6
Views: 66

Re: Inert Gases and Equilibrium

Inert gases are inert and thereby do not react with any of the other gases in solution.
by Maya Beal Dis 1D
Thu Jan 23, 2020 9:03 am
Forum: Phase Changes & Related Calculations
Topic: State Property
Replies: 6
Views: 47

Re: State Property

Something is a state property if the value can be obtained just by looking at the final and initial conditions.
by Maya Beal Dis 1D
Thu Jan 23, 2020 9:02 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: X was ignored
Replies: 27
Views: 205

Re: X was ignored

If you were unsure as to if x is a small enough value to ignore you could also just solve the problem as you usually would and get a correct answer it would just be more work.
by Maya Beal Dis 1D
Thu Jan 23, 2020 8:59 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Prep for Test 1
Replies: 16
Views: 163

Re: Prep for Test 1

You should also know how to convert between pKa, Ka, pKb, and Kb.
by Maya Beal Dis 1D
Thu Jan 23, 2020 8:58 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Changes in pressure
Replies: 5
Views: 51

Re: Changes in pressure

Increasing the pressure of a system by adding an inert gas would not shift the reaction either way because the gas is inert and therefore does not react with anything else.
by Maya Beal Dis 1D
Thu Jan 16, 2020 1:32 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: How to make ICE box
Replies: 17
Views: 309

Re: How to make ICE box

Are pure liquids and pure solids always left out of the ICE box equations?
by Maya Beal Dis 1D
Thu Jan 16, 2020 1:31 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Factors
Replies: 7
Views: 61

Re: Factors

A change in temperature is the only factor that can change K, but a change in concentration or pressure will shift Q.
by Maya Beal Dis 1D
Thu Jan 16, 2020 1:29 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Inert Gas
Replies: 5
Views: 57

Re: Inert Gas

Are noble gases the only inert gases?
by Maya Beal Dis 1D
Thu Jan 16, 2020 1:28 pm
Forum: Ideal Gases
Topic: Topics for Test 1
Replies: 17
Views: 205

Re: Topics for Test 1

Will we be done with acid/base equilibrium by the end of Friday's lecture and will that whole section be covered on the test?
by Maya Beal Dis 1D
Thu Jan 16, 2020 1:27 pm
Forum: Ideal Gases
Topic: ICE tables
Replies: 9
Views: 96

Re: ICE tables

In lecture on Wednesday Lavelle showed us how to approximate when using ICE tables so you do not have to use the quadratic equation. Are we allowed to use this approximation on a test assuming it is less then 5% the initial value or would we need to use the quadratic equation to receive full credit?
by Maya Beal Dis 1D
Tue Jan 07, 2020 2:16 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Keq vs Kc
Replies: 6
Views: 160

Re: Keq vs Kc

When would we need to specify and use Kc as opposed to just using Keq?
by Maya Beal Dis 1D
Tue Jan 07, 2020 2:15 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Very Large K
Replies: 12
Views: 174

Re: Very Large K

Would a solution that is just a solute in water have a K value?
by Maya Beal Dis 1D
Tue Jan 07, 2020 2:12 pm
Forum: Administrative Questions and Class Announcements
Topic: posting on chemistry community
Replies: 11
Views: 205

Re: posting on chemistry community

My TA confirmed that posts are due by Sunday night.
by Maya Beal Dis 1D
Tue Jan 07, 2020 2:11 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Constant
Replies: 4
Views: 82

Re: Equilibrium Constant

What is the difference between the reaction quotient and the equilibrium constant?
by Maya Beal Dis 1D
Tue Jan 07, 2020 2:10 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: HW Problem 5G.7
Replies: 4
Views: 59

Re: HW Problem 5G.7

Do we have to write Kp or can we just write K? My solutions manual only writes K.
by Maya Beal Dis 1D
Tue Dec 03, 2019 12:42 pm
Forum: Administrative Questions and Class Announcements
Topic: Grades
Replies: 15
Views: 233

Re: Grades

Would it be possible that the final curve of the overall class would make it so you need higher than a 93% to get an A? Would he curve the class up?
by Maya Beal Dis 1D
Tue Dec 03, 2019 12:40 pm
Forum: Administrative Questions and Class Announcements
Topic: Studying for the Final [ENDORSED]
Replies: 11
Views: 267

Re: Studying for the Final [ENDORSED]

I would recommend taking notes from the textbook on sections you have trouble doing the practice problems from as well.
by Maya Beal Dis 1D
Tue Dec 03, 2019 12:36 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate
Replies: 3
Views: 68

Re: Polydentate

Does a double bond mean that the atom double bonded in a ligand cannot be the atom bonded to the central atom in a coordination complex because it can't rotate?
by Maya Beal Dis 1D
Tue Dec 03, 2019 12:34 pm
Forum: Naming
Topic: Table 9C.1
Replies: 6
Views: 93

Re: Table 9C.1

Do we need to have the full name of edta memorized or can we just remember the abreviation?
by Maya Beal Dis 1D
Tue Dec 03, 2019 12:33 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Oxalate and CO3 2- as a polydentate
Replies: 3
Views: 68

Re: Oxalate and CO3 2- as a polydentate

Would it always be the two single bonded oxygens that bond to the central atom? Could it be one of the double bonded oxygens and one of the single bonded ones?
by Maya Beal Dis 1D
Mon Nov 25, 2019 5:59 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent vs linear
Replies: 56
Views: 1132

Re: Bent vs linear

Does bent mean the same thing as angular? In the textbook they use the term angular and I was sure what that meant.
by Maya Beal Dis 1D
Mon Nov 25, 2019 5:58 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Cis and Trans
Replies: 6
Views: 112

Re: Cis and Trans

I think if this were to be on a test it would most likely ask you to identify if the molecule is cis or trans and the effect that would have on the bonding/function of the molecule.
by Maya Beal Dis 1D
Mon Nov 25, 2019 5:57 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2.27b
Replies: 4
Views: 60

Re: 2.27b

To clarify, that would mean there are four regions of electron density making the electron arrangement of the central atom tetrahedral.
by Maya Beal Dis 1D
Mon Nov 25, 2019 5:56 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2.27b
Replies: 4
Views: 60

Re: 2.27b

In the textbook it says to treat the single electron on a radical as a region of electron density. The single electron would be less repulsive than two electrons in a lone pair and would effect bond angles less because of that. Still it would count as a single region of electron density.
by Maya Beal Dis 1D
Mon Nov 25, 2019 5:52 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2.57
Replies: 4
Views: 60

Re: 2.57

Yes, since the molecule has two regions of electron density the electron arrangement would be linear as would the shape.
by Maya Beal Dis 1D
Tue Nov 19, 2019 2:51 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: polarity
Replies: 5
Views: 74

Re: polarity

How do you know if they Cl atoms are across from each other or each across from a hydrogen atom when drawing the Lewis structure? Wouldn't this effect polarity?
by Maya Beal Dis 1D
Tue Nov 19, 2019 2:49 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.15
Replies: 1
Views: 42

2E.15

In part b of homework problem 2E.15 how do you determine the bond angles in the see-saw structure?
by Maya Beal Dis 1D
Tue Nov 19, 2019 2:47 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: bent v. angular
Replies: 20
Views: 388

Re: bent v. angular

If there is a central atom with two bonding regions and one lone pair what shape is it?
by Maya Beal Dis 1D
Tue Nov 19, 2019 2:47 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: bent v. angular
Replies: 20
Views: 388

bent v. angular

What qualifies as the shape bent and what is angular? Are they the same thing?

I think in lecture Lavelle referred to a central atom with two bonding domains and two lone pairs as bent, but in the textbook they've been using angular as the shape name.
by Maya Beal Dis 1D
Tue Nov 19, 2019 2:45 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: electron arrangement and structure
Replies: 1
Views: 29

electron arrangement and structure

What are the different synonyms for electron arrangement v. the molecular domains? If a question just asked for structure/shape should you only give the molecular domain name as opposed to the electron arrangement?
by Maya Beal Dis 1D
Wed Nov 13, 2019 4:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Week 9 homework
Replies: 11
Views: 171

Re: Week 9 homework

Do we still have our discussion sections on week 9 if they are earlier in the week like Tuesday or Wednesday?
by Maya Beal Dis 1D
Wed Nov 13, 2019 4:52 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Exam 2
Replies: 3
Views: 63

Re: Exam 2

I believe exam 2 will cover everything Lavelle has covered since the material which was included on the midterm. I think it begins with correcting the ionic and covalent models with polarizability and dipole moments and also includes the intermolecular forces we have been going over such as London f...
by Maya Beal Dis 1D
Wed Nov 13, 2019 4:48 pm
Forum: Ionic & Covalent Bonds
Topic: Bond Strength
Replies: 8
Views: 116

Re: Bond Strength

A general pattern for bond strength from strongest to weakest is ion-ion interactions (ionic bonds), ion-dipole interactions, dipole-dipole interactions, dipole-induced dipole interactions, induced dipole-induced dipole interactions.
by Maya Beal Dis 1D
Wed Nov 13, 2019 4:45 pm
Forum: Ionic & Covalent Bonds
Topic: Solid v. Liquid v. Gas
Replies: 8
Views: 101

Re: Solid v. Liquid v. Gas

In terms of bonding, the stronger the bonds between molecules the more solid a structure it will form, meaning stronger bonds are created in the formation of solids than liquids and liquids than gases. Varying viscosity in liquids is also caused by bond strength.
by Maya Beal Dis 1D
Wed Nov 13, 2019 4:42 pm
Forum: Ionic & Covalent Bonds
Topic: Exam 2 & Homework
Replies: 5
Views: 92

Re: Exam 2 & Homework

Chemical bonding will be covered in test 2 so I'm sure it is okay to include them in week 7 homework.
by Maya Beal Dis 1D
Tue Nov 05, 2019 3:28 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Format
Replies: 4
Views: 73

Re: Midterm Format

In lecture on Monday he said he doesn't use multiple choice problems because there is no partial credit so I believe it will all be free response.
by Maya Beal Dis 1D
Tue Nov 05, 2019 3:25 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Exam [ENDORSED]
Replies: 1
Views: 73

Re: Midterm Exam [ENDORSED]

On Professor Lavelle's website it says to bring a pen, scientific calculator, and your student ID and nothing else. I believe it will be on regular printer paper like test one was as opposed to in a blue book or on a scantron so you shouldn't need either of those.
by Maya Beal Dis 1D
Tue Nov 05, 2019 3:23 pm
Forum: Dipole Moments
Topic: Induced dipole induced dipole interaction
Replies: 2
Views: 50

Re: Induced dipole induced dipole interaction

What is the difference between an instantaneous dipole moment and a dipole-induced-dipole interaction?
by Maya Beal Dis 1D
Tue Nov 05, 2019 3:21 pm
Forum: Resonance Structures
Topic: Resonance Structures
Replies: 2
Views: 56

Re: Resonance Structures

How many resonance structures would be be required to draw on a test like in the instance where a molecule has four or more possible resonance structures? Would we get credit if we identified the majority of them?
by Maya Beal Dis 1D
Tue Nov 05, 2019 3:19 pm
Forum: Resonance Structures
Topic: 2C.5 c
Replies: 1
Views: 41

2C.5 c

In homework problem 2C.5 part c you are told to draw the structure of ClONO2 and determine or not if it is a radical. In my structure I have the Cl, O, N, and O atoms bonded in a chain with all single bonds and the last O atom bonded to the N with a double bond. This is the answer given in the book,...
by Maya Beal Dis 1D
Tue Nov 05, 2019 3:19 pm
Forum: Resonance Structures
Topic: 2C.5 c
Replies: 1
Views: 59

2C.5 c

In homework problem 2C.5 part c you are told to draw the structure of ClONO2 and determine or not if it is a radical. In my structure I have the Cl, O, N, and O atoms bonded in a chain with all single bonds and the last O atom bonded to the N with a double bond. This is the answer given in the book,...
by Maya Beal Dis 1D
Tue Nov 05, 2019 3:15 pm
Forum: Lewis Structures
Topic: Radicals
Replies: 2
Views: 71

Radicals

Will radicals be covered on the midterm? Also, in homework problem 2C.5 you are asked to draw the Lewis Structure and determine is the molecule is a radical. For part a ClO-, how would you know that the one unpaired electron would be on the oxygen atom as opposed to the chlorine? Is there any way to...
by Maya Beal Dis 1D
Mon Oct 28, 2019 11:01 am
Forum: Ionic & Covalent Bonds
Topic: Ground State
Replies: 11
Views: 134

Re: Ground State

Ions can be in ground state too even though they have a net charge. It just means that all of the electrons on the atom are in the lowest possible energy state for that number of electrons.
by Maya Beal Dis 1D
Mon Oct 28, 2019 10:58 am
Forum: Ionic & Covalent Bonds
Topic: Homework prob 2A.19
Replies: 1
Views: 48

Homework prob 2A.19

For part e of this problem, why is the ground state electron configuration [Ar]3d8 as opposed to [Ar]3d64s2? If an element is in the d block, is the (n-1)d shell always filled before the ns shell?
by Maya Beal Dis 1D
Mon Oct 28, 2019 10:56 am
Forum: Ionic & Covalent Bonds
Topic: 2A.23 question
Replies: 5
Views: 57

Re: 2A.23 question

This question asks you to determine the empirical formula of the ionic compound that would be formed if these two elements were to form an ionic bond. To do this you should find each element on the periodic table and determine the charge that element usually assumes based on it's valence electrons. ...
by Maya Beal Dis 1D
Mon Oct 28, 2019 10:54 am
Forum: Ionic & Covalent Bonds
Topic: 2A. 13 Question
Replies: 5
Views: 74

Re: 2A. 13 Question

For part d of this problem, why would an electron be removed from the 4s subshell as opposed to the 3d subshell? Wouldn't it be more stable to remove and electron from the subshell that is already only partially filled as opposed to removing an electron from the filled 4s shell?
by Maya Beal Dis 1D
Mon Oct 28, 2019 10:52 am
Forum: Ionic & Covalent Bonds
Topic: 2A. 13 Question
Replies: 5
Views: 74

Re: 2A. 13 Question

It helps me to think of which block on the periodic table the element sits in. If the element is in the third row of the p block, the valence electron will generally be removed from the 3p shell.
by Maya Beal Dis 1D
Tue Oct 22, 2019 3:46 pm
Forum: Properties of Light
Topic: Combining Different Equations
Replies: 8
Views: 104

Re: Combining Different Equations

In class I think he mentioned that you can't use electromagnetic radiation equations on electrons. What exactly does this mean?
by Maya Beal Dis 1D
Tue Oct 22, 2019 3:44 pm
Forum: Properties of Light
Topic: Homework due Next Week
Replies: 9
Views: 143

Re: Homework due Next Week

Is this the last homework we will turn in under the quantum unit?
by Maya Beal Dis 1D
Tue Oct 22, 2019 3:39 pm
Forum: DeBroglie Equation
Topic: Velocity
Replies: 13
Views: 382

Re: Velocity

In problem 1B.21 you must know the conversion between miles per hour and meters per second. Are these conversion factors something we must memorize or will test problems always be given in SI units?
by Maya Beal Dis 1D
Tue Oct 22, 2019 3:37 pm
Forum: DeBroglie Equation
Topic: DeBroglie Equation
Replies: 11
Views: 147

Re: DeBroglie Equation

In some of the homework problems you need to know the mass of an electron, neutron, or proton to use the DeBroglie equation and find wavelength. Do we need to have these masses memorized or would they be given on a test?
by Maya Beal Dis 1D
Tue Oct 22, 2019 3:36 pm
Forum: Einstein Equation
Topic: 1B.15)
Replies: 4
Views: 110

Re: 1B.15)

What is an eV and are we required to know the conversion between that and a Joule?
by Maya Beal Dis 1D
Tue Oct 15, 2019 11:39 am
Forum: Properties of Electrons
Topic: 1A 15
Replies: 4
Views: 126

Re: 1A 15

102.6 nm is part of the UV spectrum so you know you are using the Lyman series. You first divide the speed of light by the wavelength given to get frequency. You then rearrange the Rydberg Equation and use your calculated frequency to determine n2 is 3.
by Maya Beal Dis 1D
Tue Oct 15, 2019 11:35 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 [ENDORSED]
Replies: 107
Views: 5093

Re: Test 1 [ENDORSED]

I think we will be getting graded tests back in our discussion sections on week 3.
by Maya Beal Dis 1D
Tue Oct 15, 2019 11:34 am
Forum: Properties of Light
Topic: 1A.11
Replies: 2
Views: 47

Re: 1A.11

What does it mean that the principle quantum number for the lowest energy level is the same for each series?
by Maya Beal Dis 1D
Tue Oct 15, 2019 11:32 am
Forum: Properties of Light
Topic: Wave Frequency
Replies: 9
Views: 115

Re: Wave Frequency

What is the relationship between the amplitude of a wave and the frequency? Or the relationship between amplitude and wavelength? What does amplitude tell us exactly?
by Maya Beal Dis 1D
Tue Oct 15, 2019 11:30 am
Forum: Properties of Light
Topic: 1.A.3
Replies: 2
Views: 39

1.A.3

In homework problem 1.A.3 it asks if the extent of change in the electrical field at a given point decreases as the frequency of electromagnetic radiation decreases. I understand that as the frequency decreases the slope of the wave also decreases, but what roles does amplitude play in the extent of...
by Maya Beal Dis 1D
Thu Oct 10, 2019 8:27 am
Forum: Balancing Chemical Reactions
Topic: Combustion
Replies: 17
Views: 585

Re: Combustion

If in a problem it says it is a combustion reaction, that is how you know the products will be water and carbon dioxide. Often in combustion reactions the question will not give that information directly.
by Maya Beal Dis 1D
Thu Oct 10, 2019 8:26 am
Forum: Significant Figures
Topic: Are we allowed to round when showing work?
Replies: 7
Views: 125

Re: Are we allowed to round when showing work?

When using dimensional analysis, when you round it in the end make sure you round it to the same amount of significant figures as the value with the least amount of significant figures that you used in you calculations.
by Maya Beal Dis 1D
Thu Oct 10, 2019 8:23 am
Forum: Administrative Questions and Class Announcements
Topic: Week 2 Homework Problems [ENDORSED]
Replies: 67
Views: 3456

Re: Week 2 Homework Problems [ENDORSED]

Does it matter which subsection the homework problems we are doing are from as long as they are within the quantum mechanics section (like 1A v. 1B v. 1D etc.)?
by Maya Beal Dis 1D
Thu Oct 10, 2019 8:21 am
Forum: Administrative Questions and Class Announcements
Topic: Week 2 Homework Problems [ENDORSED]
Replies: 67
Views: 3456

Re: Week 2 Homework Problems [ENDORSED]

Since the Quantum Unit is more than a week long does it mean we just hand in five homework problems from that section every week until we are done with the unit?
by Maya Beal Dis 1D
Thu Oct 10, 2019 8:18 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 [ENDORSED]
Replies: 107
Views: 5093

Re: Test 1 [ENDORSED]

Are we really only allowed to use pen on the test? What happens if we make a mistake on the paper, can we get scratch paper or extra pieces of paper? There is plenty of room on the test to solve the problems. You are allotted at least half a sheet per problem which I found to be enough even with so...
by Maya Beal Dis 1D
Thu Oct 03, 2019 11:36 am
Forum: SI Units, Unit Conversions
Topic: Scientific Notation (general requirement for the course)
Replies: 5
Views: 69

Re: Scientific Notation (general requirement for the course)

You could also write it as 12000 because that also uses only 2 significant figures. Any zeros to the right of a whole number are not considered significant figures.
by Maya Beal Dis 1D
Thu Oct 03, 2019 11:34 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Tips on how to write a formula out from the name
Replies: 9
Views: 210

Re: Tips on how to write a formula out from the name

Do we need to have the formulas and charges of polyatomic ions and their charges memorized or will they be given on a test? For example in textbook problem G.5 you are unable to solve the problem unless you know the molecular formula of sodium carbonate. Will there be problems like this on the test?
by Maya Beal Dis 1D
Thu Oct 03, 2019 11:31 am
Forum: Empirical & Molecular Formulas
Topic: Naming Molecular Compounds
Replies: 6
Views: 101

Re: Naming Molecular Compounds

When would you need to specify a molecule as anhydrous? I know most often that is the state molecules are in, but when naming compounds when must you include anhydrous in the written name?
by Maya Beal Dis 1D
Thu Oct 03, 2019 11:30 am
Forum: Balancing Chemical Reactions
Topic: States of Matter in a Chemical Equation [ENDORSED]
Replies: 11
Views: 159

Re: States of Matter in a Chemical Equation [ENDORSED]

In what instances would a molecule be liquid as opposed to aqueous? What are some examples of molecules besides water that are in the state of pure liquid and not aqueous?
by Maya Beal Dis 1D
Wed Oct 02, 2019 2:27 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Naming Compounds (F13)
Replies: 7
Views: 140

Re: Naming Compounds (F13)

How many of the naming rules do we need to know for the test next week? Do we need to have the names and charges of polyatomic ions memorized or will they be given if needed to solve a problem?

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