Search found 91 matches

by 605291562
Sun Feb 28, 2021 11:30 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Shorthand notation
Replies: 3
Views: 18

Re: Shorthand notation

I think this is covered in sapling, but the general format is anode ion/ ion compound//ion compound/ ion cathode
by 605291562
Sun Feb 28, 2021 11:27 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams Question
Replies: 3
Views: 15

Re: Cell Diagrams Question

I agree with Eliana, I kept switching the side of the cathode and anode on sapling and it took me a while to figure out that the order mattered.
by 605291562
Sun Feb 28, 2021 11:25 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Salt Bridge
Replies: 19
Views: 33

Re: Salt Bridge

Hi! As I understand it the purpose of the salt bridge is to allow for the electrons to flow freely from the cathode.
by 605291562
Sun Feb 28, 2021 11:22 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated Systems
Replies: 4
Views: 14

Re: Isolated Systems

I don't think that there can be a perfect isolated system, however I'm pretty sure that we are able to get fairly close and therefore in these cases can make the assumption that it will follow the same equations and patterns as a perfectly isolated system.
by 605291562
Sun Feb 28, 2021 11:17 pm
Forum: Balancing Redox Reactions
Topic: Compounds as both reducing and oxidizing agents
Replies: 2
Views: 16

Re: Compounds as both reducing and oxidizing agents

Hi! I think a species can be both if it is the only thing on the left side of the equation and is then broken up in the reaction
by 605291562
Sun Feb 21, 2021 7:34 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Enthalpy of Formation
Replies: 3
Views: 24

Re: Enthalpy of Formation

I think you know by either the subscript (or superscript in some cases) of 0, but you can also tell if its delta H of formation is 0.
by 605291562
Sun Feb 21, 2021 7:32 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Monatomic and Linear Gases
Replies: 4
Views: 16

Re: Monatomic and Linear Gases

Hi! I think if if was a monatomic or linear Gas we would be told as well as given what value we should use a R.
by 605291562
Sun Feb 21, 2021 7:30 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Reversible vs. irreversible & isothermal
Replies: 7
Views: 46

Re: Reversible vs. irreversible & isothermal

Yes! I think this is because if there was a change in temperature the reaction would favor one side over the other and therefor it would change into an irreversible reaction.
by 605291562
Sun Feb 21, 2021 7:28 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Textbook 4C11
Replies: 4
Views: 23

Re: Textbook 4C11

Hi! I think for this question you just need to add the change that occurs when you go from a solid to a liquid and then the change that occurs as a result of the increase in temperature (I think Hess's Law makes that possible)
by 605291562
Sun Feb 21, 2021 7:26 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Equilibrium Systems
Replies: 7
Views: 46

Re: Equilibrium Systems

Hi! like above I don't think you would ever have to integrate because he never went over it in class, I think the whole point of him showing that was just to show where the equation came from. Also yes in real life a system is never perfectly in equilbrium!
by 605291562
Sun Feb 14, 2021 6:30 pm
Forum: Phase Changes & Related Calculations
Topic: internal energy equation
Replies: 5
Views: 22

Re: internal energy equation

Yes I agree with above that delta u=q+w and then we derived different equations from that in lecture 11 I believe
by 605291562
Sun Feb 14, 2021 6:29 pm
Forum: Phase Changes & Related Calculations
Topic: Sapling Week 3/4 #9
Replies: 5
Views: 52

Re: Sapling Week 3/4 #9

I think the equation should be -deltaH/T. I kept getting this question wrong because I was forgetting to convert the units, and then I believe you just add your previous two answers for the third one.
by 605291562
Sun Feb 14, 2021 6:26 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: standard change in enthalpy vs. change in enthalpy
Replies: 4
Views: 25

Re: standard change in enthalpy vs. change in enthalpy

I think that normally the units are in KJ but if you are taking into account moles then you use KJ/mol
by 605291562
Sun Feb 14, 2021 6:25 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Sapling week 5/6 #3
Replies: 2
Views: 18

Re: Sapling week 5/6 #3

I agree, I can't think of a situation where the signs would be opposite for the phase changes. I thought that was a bit of an odd sapling question too.
by 605291562
Sun Feb 14, 2021 6:23 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Including n
Replies: 11
Views: 45

Re: Including n

Hi! I agree with above that it is often a case by case basis, but a pretty clear sign is if it asks for it in terms of moles
by 605291562
Sun Feb 07, 2021 4:51 pm
Forum: Phase Changes & Related Calculations
Topic: Sapling #10
Replies: 6
Views: 55

Re: Sapling #10

I think I started by converting the mass of ice to moles and then multiplying to get q1 and then using the equation q1+q2=-q3 to solve the rest
by 605291562
Sun Feb 07, 2021 4:46 pm
Forum: Phase Changes & Related Calculations
Topic: Reversible vs Irreversible Reactions
Replies: 3
Views: 29

Re: Reversible vs Irreversible Reactions

Hi! just to add on to what has already been said, my TA in discussion section said that you can pretty much assume that the reversible reaction will do more work every time than the same reaction that is irreversible.
by 605291562
Sun Feb 07, 2021 4:44 pm
Forum: Phase Changes & Related Calculations
Topic: Sapling week 4 question 12
Replies: 2
Views: 25

Re: Sapling week 4 question 12

I agree with above that it dose not matter what the compound is if you use the change in temperature and information from part a then you should be able to solve the question.
by 605291562
Sun Feb 07, 2021 4:41 pm
Forum: Phase Changes & Related Calculations
Topic: Water's Heating Curve
Replies: 9
Views: 41

Re: Water's Heating Curve

To add on to above, I think the most confusing thing is that the phases are the lines that have a slope and the flat lines are when the phase is changing so make sure to note that!
by 605291562
Sun Jan 31, 2021 9:25 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Endothermic and Exothermic Concepts
Replies: 12
Views: 63

Re: Endothermic and Exothermic Concepts

Hi! I think he meant that because endothermic reactions need heat to happen that when heat is added the products are favored and the reaction shifts right (I think of it like adding heat is like adding a reactant), so I think all he means is the addition of heat favors more products being formed
by 605291562
Sun Jan 31, 2021 9:21 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Temperature Change
Replies: 13
Views: 70

Re: Temperature Change

Hi! I agree with above that because endothermic reactions require heat it is like adding a reactant (even though that is not a perfect analogy) so the reaction will favor the products and K will increase. I'm not entirely sure how it would effect exothermic
by 605291562
Sun Jan 31, 2021 5:32 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: COOH group
Replies: 3
Views: 27

Re: COOH group

hi, like above I think they are used alot because they appear commonly in nature and can bond to water. When you see a COOH group it is a good sign you are dealing with a weak acid
by 605291562
Sun Jan 31, 2021 5:29 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE table, when to divide by L
Replies: 5
Views: 32

Re: ICE table, when to divide by L

You only have to divide by L if you are given moles instead of molarity (you need to use molarity for the ICE table)
by 605291562
Sun Jan 31, 2021 5:26 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Strong Acids/Bases
Replies: 19
Views: 134

Re: Strong Acids/Bases

Hi! I agree with above that you should have the most common strong acids memorized, but that will probably happen in general with the more practice problems you do and recognize the patterns that they share
by 605291562
Sun Jan 24, 2021 9:24 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Units for ΔH
Replies: 3
Views: 39

Re: Units for ΔH

I think you should use whatever units are given in the problem, even though it is usually kj/mol I think they would specify if they wanted kj/mol or j/mol
by 605291562
Sun Jan 24, 2021 9:21 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond enthalpies and phase changes
Replies: 6
Views: 31

Re: Bond enthalpies and phase changes

I agree with above that you use the table and add that to the enthalpy of the phase change which I assume would be given, if not does anyone know how to calculate that?
by 605291562
Sun Jan 24, 2021 9:19 pm
Forum: Phase Changes & Related Calculations
Topic: State Property
Replies: 11
Views: 83

Re: State Property

I agree with above that heat is not a state property because we cannot only consider the initial and final temperatures, unless it is a specific closed system. I think the best way to think of this is the way professor described it in class where you're hiking and one person might take a longer path...
by 605291562
Sun Jan 24, 2021 9:17 pm
Forum: Phase Changes & Related Calculations
Topic: State Changes
Replies: 4
Views: 37

Re: State Changes

Hi! like said above I think it's different than the photoelectric effect. I believe that any phase change would require energy but I don't think we have to memorize these values.
by 605291562
Sun Jan 24, 2021 9:15 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy of a Phase Change
Replies: 5
Views: 24

Re: Enthalpy of a Phase Change

Hi! I think anything listed in a state not a gas (liquid or solid) it will be given to us because I don't think he ever went over how to calculate those values on our own
by 605291562
Sun Jan 17, 2021 9:11 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kp to Kc conversion
Replies: 5
Views: 34

Re: Kp to Kc conversion

Hi! I would always check with the outlines Lavelle puts on his website for what is expected for us to know for exams. I agree with above that it never hurts to know the formula.
by 605291562
Sun Jan 17, 2021 9:09 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: What makes a weak acid?
Replies: 11
Views: 49

Re: What makes a weak acid?

Hi! I think we should be able to recognize weak acids and bases based on similarities and patterns (for example COOH often indicates a weak acid) which does take a little bit of memorization, but with the more practice you get they become easier to see.
by 605291562
Sun Jan 17, 2021 9:05 pm
Forum: Ideal Gases
Topic: pure substance
Replies: 4
Views: 63

Re: pure substance

I don't think gasses cannot be pure, I think we just cannot assume that they are where as he told us that we could assume liquids are pure.
by 605291562
Sun Jan 17, 2021 9:03 pm
Forum: Ideal Gases
Topic: Kp?
Replies: 30
Views: 122

Re: Kp?

Yeah, I believe he said in lecture for the purpose of this class we only need to think of partial pressure applied to gasses
by 605291562
Sun Jan 17, 2021 9:00 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: how to set up quadratic equation
Replies: 3
Views: 40

Re: how to set up quadratic equation

Yes as everyone has been saying above you cross multiply the denominator by the value given then move all your terms to one side to get a quadratic equation. He also went through one example where there was an x^3 term which is what you might have been thinking of.
by 605291562
Sun Jan 17, 2021 8:57 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Acid and Bases
Replies: 3
Views: 29

Re: Acid and Bases

Hi! I think the first step is always to balance the equation, but because that is more of a 14a concept I have noticed he has been giving us the equations already balanced most of the time.
by 605291562
Sun Jan 10, 2021 4:21 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium mixture
Replies: 4
Views: 27

Re: Equilibrium mixture

The above response is correct, because they can be used interchangeably in some instances I think it will be made clear in other ways what it is asking you to do.
by 605291562
Sun Jan 10, 2021 4:19 pm
Forum: Ideal Gases
Topic: Non-Ideal gases?
Replies: 26
Views: 154

Re: Non-Ideal gases?

Lavelle normally posts detailed outlines that include what material this course covers and posts it on his website, if there is no mention of it there it's pretty safe to assume that you will not need to know it for this course.
by 605291562
Sun Jan 10, 2021 4:17 pm
Forum: Ideal Gases
Topic: Reviewing PV=NRT
Replies: 7
Views: 78

Re: Reviewing PV=NRT

On sapling you can find a pdf version you can download which is probably easiest, they also have all the odd answers in the back of the book.
by 605291562
Sun Jan 10, 2021 4:15 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Stability
Replies: 8
Views: 62

Re: Stability

I agree with the above answers that just comparing the q and K values cannot tell us about the stability of the reaction only which there is more of.
by 605291562
Sun Jan 10, 2021 4:12 pm
Forum: Ideal Gases
Topic: inert gas and pressure changes
Replies: 9
Views: 39

Re: inert gas and pressure changes

Hi! I agree with what was said above that because the volume does not change with the addition of inert gas the concentration stays the same
by 605291562
Sun Dec 13, 2020 9:02 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Solubility of Ionic bonds
Replies: 3
Views: 30

Re: Solubility of Ionic bonds

I agree I think the easiest way to think about it is when it reacts with water the positive end of the water molecule with mix with the negative end of the molecule (and vice versa) and will pull the ionic compound apart.
by 605291562
Sun Dec 13, 2020 8:58 am
Forum: Lewis Structures
Topic: Lewis Acids and Bases
Replies: 3
Views: 37

Re: Lewis Acids and Bases

Hi! I agree with what was said above, I think it is easiest to tell if you draw out the molecule because then you can clearly see that it will accept electrons.
by 605291562
Sun Dec 13, 2020 8:56 am
Forum: Lewis Structures
Topic: SO2 Lewis Structure
Replies: 3
Views: 25

Re: SO2 Lewis Structure

I agree with what was said above I think expanded octets are the last resort and it is more stable for oxygen to have a charge than sulfur
by 605291562
Sun Dec 13, 2020 8:54 am
Forum: Dipole Moments
Topic: identifying polarity from a dipole moment
Replies: 2
Views: 23

Re: identifying polarity from a dipole moment

Hi! like said above it's easiest to determine if a molecule is not symmetric than it is probably polar, if it is symmetric than you can look to see if the dipole moments cancel
by 605291562
Sun Dec 13, 2020 8:46 am
Forum: Properties of Electrons
Topic: atomic spectra
Replies: 2
Views: 21

Re: atomic spectra

I think it could also depend on which series you're using but I think n=2 would be a good rule of thumb
by 605291562
Sun Dec 06, 2020 1:44 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Memorizing shapes based on general formula?
Replies: 5
Views: 61

Re: Memorizing shapes based on general formula?

I think we should have them memorized, I would recommend flashcards for this because they can start to get a little confusing once you stray from the basic ones.
by 605291562
Sun Dec 06, 2020 1:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecules with lone pairs
Replies: 5
Views: 86

Re: Molecules with lone pairs

Hi! Lone pairs are more repulsive than bonded atoms because they are held closer to the nucleus meaning they are not "stretched" out as far and their repulsion is more concentrated.
by 605291562
Sun Dec 06, 2020 1:35 pm
Forum: Biological Examples
Topic: Coordination compounds having too many oxidation states
Replies: 2
Views: 44

Re: Coordination compounds having too many oxidation states

Hi! like said above the more oxidation states available the less tightly electrons are held and can move more easily making these good for electron transfer
by 605291562
Sun Dec 06, 2020 1:32 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Flashcards
Replies: 8
Views: 67

Re: Flashcards

I think flashcards are really helpful, even just the step of sitting down and making the flashcards always helps me remember information better.
by 605291562
Sun Dec 06, 2020 12:26 pm
Forum: Naming
Topic: Naming Coordination Compounds
Replies: 9
Views: 78

Re: Naming Coordination Compounds

When the coordination complex has an overall negative charge you add ate (and drop the ide I think)
by 605291562
Sun Nov 29, 2020 3:20 pm
Forum: Naming
Topic: Nomenclature
Replies: 5
Views: 101

Re: Nomenclature

Hi! Like said above it is probably helpful to have a basic understanding of nomenclature, however I do not think this would be a topic of focus. I always go off of what Professor posts in his outlines for what is needed to know for exams and I do not recall seeing that on the list.
by 605291562
Sun Nov 29, 2020 3:17 pm
Forum: Hybridization
Topic: delocalized pi bonds
Replies: 15
Views: 84

Re: delocalized pi bonds

When a molecule has resonance the electrons are delocalized because there most stable state is somewhere between the lewis structures we can draw and most likely double bonds are present, these structures would have delocalized pi bonds.
by 605291562
Sun Nov 29, 2020 3:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Axial vs Equatorial Bonds
Replies: 11
Views: 109

Re: Axial vs Equatorial Bonds

Hi! axial bonds are formed on the vertical axis (think of the earths axis, or the y axis in math) while equatorial are on the plane of the atom ( Think of the earths equator). If you have lone pairs than they both should be axial because that will create a 180 degree bond which is most stable, howev...
by 605291562
Sun Nov 29, 2020 3:10 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pair vs radical
Replies: 3
Views: 31

Re: Lone pair vs radical

Hi! I agree with what has already been said, I think that there would still be an effect and repulsion but it would have a smaller electron cloud and therefor less of an effect on the shape.
by 605291562
Sun Nov 29, 2020 3:08 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Tips for VSEPR
Replies: 6
Views: 65

Re: Tips for VSEPR

Hi! I have personally found that making flashcards with the number of bonds, lone pairs, bond angles and shape have really helped me learn this content, I always prefer to make my own because I feel like it "sticks" better than just looking at a chart. Hope this helped!
by 605291562
Sat Nov 21, 2020 4:26 pm
Forum: Dipole Moments
Topic: What are dipole moments
Replies: 9
Views: 71

Re: What are dipole moments

The dipole moment is how we can measure the difference in charge between to atoms or molecules and are typically represented by an arrow showing the way electrons are being pulled. This is an important concepts because this is one way molecules and ions are able to interact, although it is a fairly ...
by 605291562
Sat Nov 21, 2020 4:21 pm
Forum: Electronegativity
Topic: Trick for remembering periodic trends
Replies: 11
Views: 144

Re: Trick for remembering periodic trends

This is really helpful, thank you! I typically try to just use what I know about atomic radius and how that would effect the other trends, but this is probably much faster.
by 605291562
Sat Nov 21, 2020 4:20 pm
Forum: Lewis Structures
Topic: Electron Density
Replies: 14
Views: 137

Re: Electron Density

Hi! Like other's said electron density is just the probability that an electron would be found there so a higher electron density would mean a higher probability of an electron being in the area. The term itself is a little confusing because it does not mean what we typically think of density meaning.
by 605291562
Sat Nov 21, 2020 4:17 pm
Forum: Bond Lengths & Energies
Topic: Bond Dissociation
Replies: 5
Views: 80

Re: Bond Dissociation

I think dissociation energy is the energy needed to break a bond so weaker bonds are easier to break therefor they require less energy to break. Hope this helped!
by 605291562
Sat Nov 21, 2020 4:14 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Oxidation Number
Replies: 11
Views: 138

Re: Oxidation Number

Hi! Posted above are great ways to find the oxidation number however for this course I don't think it is necessary to know. It is not listed in Professor Lavell's guidelines which I feel are an accurate way to know what is necessary to know.
by 605291562
Sun Nov 15, 2020 5:21 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge Formula
Replies: 4
Views: 40

Re: Formal Charge Formula

I'm pretty sure it refers to all unbonded electrons, if you go by the number of lone pairs you will only count half the number you need to
by 605291562
Sun Nov 15, 2020 5:18 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Number of Resonance Structures
Replies: 7
Views: 102

Re: Number of Resonance Structures

I don't think you need to worry too much about having to draw all the resonance structures for an exam, as long as you know how to identify them and then compare (for example which is the most stable etc. like the sapling problem) I think you will be in a good spot.
by 605291562
Sun Nov 15, 2020 5:16 pm
Forum: Octet Exceptions
Topic: Clarification on octet exceptions
Replies: 3
Views: 18

Re: Clarification on octet exceptions

Hi adding onto everything else said I think there are some that do not need 8 to be stable for example B and Be can be stable with less than 8
by 605291562
Sun Nov 15, 2020 5:12 pm
Forum: Hybridization
Topic: Charges
Replies: 9
Views: 533

Re: Charges

I think you should always include the formal charge if it is not equal to 0. That is at least what sapling wants so I would assume it would be the same for an exam
by 605291562
Sun Nov 15, 2020 5:10 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Memorizing the Different Shapes
Replies: 4
Views: 37

Re: Memorizing the Different Shapes

Hi! Like others have said I think we will be required to know/ memorize the bond angles and names. Most of them are pretty straightforward/ can be figured out pretty easily. I'm not sure how much more complex we will get in this class but I assume the ones gone over in class are fair game.
by 605291562
Sun Nov 15, 2020 5:07 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Drawing the lone pairs on the central atom
Replies: 5
Views: 46

Re: Drawing the lone pairs on the central atom

Hi! Yes you need to take lone pairs into consideration because they repel other electrons (especially other lone pairs) more than bonds. For this reason they effect the bond angles and shape of the molecule. Hope this helped.
by 605291562
Sun Nov 08, 2020 4:31 pm
Forum: Trends in The Periodic Table
Topic: Size & Expected Knowledge
Replies: 5
Views: 84

Re: Size & Expected Knowledge

I think this would be a fair question to ask because it can be figured out using what we know about periodic trends.
by 605291562
Sun Nov 08, 2020 4:24 pm
Forum: Octet Exceptions
Topic: Exceptions
Replies: 9
Views: 55

Re: Exceptions

I think being able to recognize them is more important then memorizing them, based on how this class has worked so far I feel like it has been more about application than memorization. Also I think if it was something to memorize it would have been listed on the outline.
by 605291562
Sun Nov 08, 2020 4:22 pm
Forum: Bond Lengths & Energies
Topic: ionization energy
Replies: 6
Views: 92

Re: ionization energy

If it helps you can use periodic trends to help answer this one! Ionization energy increases across a row and we know that Nitrogen and Fluorine are to the right of Oxygen. You could also use the trend of atomic radius which we know decreases as you go across a row because the electrons are being he...
by 605291562
Sun Nov 08, 2020 4:16 pm
Forum: Electronegativity
Topic: periodic table
Replies: 16
Views: 133

Re: periodic table

Hi! I always use the atomic radius to remember the rest so then I only have to memorize one. Atomic radius decreases across a period and increases down the group. If you then think of how increasing or decreasing the radius it effects the other principals (I think they are almost always inversely re...
by 605291562
Sun Nov 08, 2020 4:11 pm
Forum: Lewis Structures
Topic: Oxidation Numbers
Replies: 7
Views: 32

Re: Oxidation Numbers

Hi! As others have said, I don't see it on the outline posted on the class website so I would not worry too much about it for this unit. While I think sapling is helpful sometimes I think can be a little off of what we are actually required to know.
by 605291562
Sun Nov 01, 2020 11:00 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty percentage
Replies: 5
Views: 46

Re: Uncertainty percentage

I am also confused by this, on sapling whenever this is given I just ignore whatever comes after the +/- and have always gotten the correct answer that way.
by 605291562
Sun Nov 01, 2020 10:57 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Spectral Lines
Replies: 2
Views: 49

Re: Spectral Lines

Hi! yep you are correct, the lines refer to the distinct changes of energy possible so you thought process of 7-6,7-5,7-4,7-3,7-2,7-1 is right!
by 605291562
Sun Nov 01, 2020 10:55 pm
Forum: DeBroglie Equation
Topic: When to use de Broglie and what numbers to use
Replies: 8
Views: 57

Re: When to use de Broglie and what numbers to use

I've noticed the same thing, I've always just used the equation on our equation sheet and process done in class because that's how we should do it on the exams, but you get the right answer either way so I don't think it really matters which process you use.
by 605291562
Sun Nov 01, 2020 10:51 pm
Forum: Photoelectric Effect
Topic: Participation points
Replies: 16
Views: 180

Re: Participation points

Hi! Like said above I think its 5 times per week, you can also see how many times you've posted if you click on your name in the top right corner and go to "your posts" hope this helped!
by 605291562
Sun Nov 01, 2020 10:48 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 254
Views: 36406

Re: Final Jitters

Hi! I've also had increased jitters when it comes to taking exams online! Some things that I have found helpful include scheduling in breaks for myself, waking up early that day after getting a good nights sleep and getting lots of exercise and time outside so I can get a little time away from scree...
by 605291562
Sun Oct 25, 2020 4:20 pm
Forum: Properties of Electrons
Topic: Experiments/conceptuals we need to know
Replies: 4
Views: 46

Re: Experiments/conceptuals we need to know

Hi! I'm not entirely sure but I would say that if you have a good idea of the concepts that would be fine and that you would not need to necessarily know the specifics of the experiments.
by 605291562
Sun Oct 25, 2020 4:15 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Midterm 1
Replies: 18
Views: 208

Re: Midterm 1

I think because we covered it in our lectures before when he indicated it's fair game for the midterm.
by 605291562
Sun Oct 25, 2020 4:10 pm
Forum: DeBroglie Equation
Topic: Derivation of Equations on Midterm?
Replies: 17
Views: 112

Re: Derivation of Equations on Midterm?

Hi! I would assume that because we provided with a formula sheet and the midterm is multiple choice this would not be a question that would come up.
by 605291562
Sun Oct 25, 2020 4:09 pm
Forum: Photoelectric Effect
Topic: Calculations
Replies: 18
Views: 124

Re: Calculations

I think it is always recommended that you use the whole number until the end then round using sig fig rules. This should not be an issue for the exam because it's multiple choice.
by 605291562
Sun Oct 25, 2020 4:06 pm
Forum: Einstein Equation
Topic: Einstein's Equation
Replies: 7
Views: 106

Re: Einstein's Equation

They found out from the photoelectric experiment that the kinetic energy of the ejected electrons equals the energy of the photon minus the work function
by 605291562
Sun Oct 18, 2020 2:56 pm
Forum: Student Social/Study Group
Topic: How are you studying?
Replies: 203
Views: 1404

Re: How are you studying?

I have always found outlining to be really helpful for me! I also think that during this weird time it is even more important to schedule out time to study and time for breaks so you are not cramming at the last minute or drive yourself crazy studying all the time. Hope this helped :)
by 605291562
Sun Oct 18, 2020 2:52 pm
Forum: Properties of Electrons
Topic: Grading System
Replies: 7
Views: 112

Re: Grading System

Hi, I do not think there is a curve but if there is it will only help your grade never lower your grade to encourage students to work together.
by 605291562
Sun Oct 18, 2020 2:49 pm
Forum: Photoelectric Effect
Topic: Light Intensity
Replies: 23
Views: 111

Re: Light Intensity

Yes! Like everyone else has said they adjusted the brightness. I believe if they would have increased the wavelength there would have been a change.
by 605291562
Sun Oct 18, 2020 2:47 pm
Forum: DeBroglie Equation
Topic: Names of equations
Replies: 8
Views: 39

Names of equations

For the exams do we need to know the names of the equations or is it okay if we just know the equatiom?
by 605291562
Sun Oct 11, 2020 4:10 pm
Forum: Significant Figures
Topic: Sig Figs
Replies: 4
Views: 38

Re: Sig Figs

Hi! Sig Figs are used to make sure we are accurately presenting how precise the data we used is. For example if we measured something with a beaker that only had dashes for every 10 cm we could not be as precise as if we were measuring with something that has dashes at every cm. sig figs takes this ...
by 605291562
Sun Oct 11, 2020 4:05 pm
Forum: Limiting Reactant Calculations
Topic: Theoretical yield: confused
Replies: 8
Views: 114

Re: Theoretical yield: confused

Yes like others have said theoretical yield is assuming that there is no mass lost due to error (like sticking to the tube, etc.) When you compare the theoretical yield to what was actually produced you are most likely finding the percent yield.
by 605291562
Sun Oct 11, 2020 4:02 pm
Forum: Balancing Chemical Reactions
Topic: Whole Number Stoichiometric Coefficients
Replies: 12
Views: 108

Re: Whole Number Stoichiometric Coefficients

Hi! While it's correct to have a fraction, I think it's preferred to change it to a whole number. If it's written as a fraction you just have to multiply through by the denominator which does not take alot of time. I would go better safe than sorry and change to a whole number
by 605291562
Sun Oct 11, 2020 4:01 pm
Forum: Balancing Chemical Reactions
Topic: Whole Number Stoichiometric Coefficients
Replies: 12
Views: 108

Re: Whole Number Stoichiometric Coefficients

Hi! While it's correct to have a fraction, I think it's preferred to change it to a whole number. If it's written as a fraction you just have to multiply through by the denominator which does not take alot of time. I would go better safe than sorry and change to a whole number
by 605291562
Sun Oct 11, 2020 12:49 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Molar Mass and precision/interpretation
Replies: 5
Views: 58

Re: Molar Mass and precision/interpretation

I think I used 100g/mol because the math worked out a little nicer and the answer was right.
by 605291562
Sun Oct 11, 2020 12:45 pm
Forum: Significant Figures
Topic: All students read this sig fig post [ENDORSED]
Replies: 133
Views: 18266

Re: All students read this sig fig post [ENDORSED]

Does sapling take sig figs into account? I know some other online textbooks have a buffer so you still get credit even if your answer is rounded wrong.

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