Search found 101 matches

by 305421980
Sat Mar 14, 2020 1:19 pm
Forum: Administrative Questions and Class Announcements
Topic: Printing for Final
Replies: 9
Views: 66

Printing for Final

Will we need to print anything for the final?
by 305421980
Fri Mar 13, 2020 10:04 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Concentration Cells
Replies: 2
Views: 12

Concentration Cells

What should we remember about concentration cells?
by 305421980
Fri Mar 13, 2020 10:00 pm
Forum: Balancing Redox Reactions
Topic: QD3 Midterm
Replies: 5
Views: 35

QD3 Midterm

I know this question isn't about electrochemical, but the only acid and base section I could find was for 14A.
Somehow I got this question right on the midterm but don't know why or how.
It asks:
At pH 6 what is the net charge for acetic acid, CH3COOH (pKa=4.75)?

What is the concept behind this?
by 305421980
Fri Mar 13, 2020 9:50 pm
Forum: *Nucleophiles
Topic: FInal
Replies: 6
Views: 54

FInal

Do you think we will need to know in-depth about these things and what is said in the book or just as much as he talks about in lecture?
by 305421980
Fri Mar 13, 2020 12:47 pm
Forum: Phase Changes & Related Calculations
Topic: Steam vs Boiling water
Replies: 2
Views: 25

Steam vs Boiling water

Why is steam a worse burn? is it because it still has higher energy than boiling water at the same temp?
by 305421980
Fri Mar 13, 2020 12:17 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Slow Step Mechanism
Replies: 7
Views: 28

Slow Step Mechanism

Is it more common for the early steps or the later steps to be the slow step?
by 305421980
Fri Mar 13, 2020 12:15 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Slow Step Determination
Replies: 5
Views: 29

Slow Step Determination

How do we determine which step is slow? Or will this always be given?
by 305421980
Thu Mar 12, 2020 9:22 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Week 10 Review Problems
Replies: 4
Views: 31

Week 10 Review Problems

For this example problem: What is wrong with this cell diagram? Ag(s) / AgBr(s) // Br-(aq) / Br2(g)
is the only thing wrong with it the missing Pt(s)?
by 305421980
Thu Mar 12, 2020 8:54 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2 Answers
Replies: 1
Views: 23

Test 2 Answers

Will Test 2 Answers be posted for studying?
by 305421980
Thu Mar 12, 2020 8:51 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Review Problem for Week 10 #5
Replies: 3
Views: 19

Review Problem for Week 10 #5

When is delta G formation zero?
by 305421980
Thu Mar 12, 2020 5:24 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: q and delta H
Replies: 4
Views: 17

q and delta H

When does q = delta H?
by 305421980
Tue Mar 10, 2020 8:42 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2 Grades
Replies: 22
Views: 184

Re: Test 2 Grades

Do we still think there will be an opportunity to go to office hours or review the exams with the email announcement about classes going online?
by 305421980
Tue Mar 10, 2020 8:41 pm
Forum: Administrative Questions and Class Announcements
Topic: Email Announcement
Replies: 8
Views: 183

Re: Email Announcement

I would assume that we still have normal class because there hasn't been any emails from him yet
by 305421980
Tue Mar 10, 2020 8:40 pm
Forum: Administrative Questions and Class Announcements
Topic: Office Hours/Review Sessions
Replies: 1
Views: 18

Office Hours/Review Sessions

How will the review sessions and office hours be impacted by all the cancelations? Will they still be held (hopefully)?
by 305421980
Tue Mar 10, 2020 7:28 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Pressure Rule
Replies: 4
Views: 16

Pressure Rule

When looking at a reaction at equilibrium and trying to decide which way the reaction will proceed with a decrease in pressure, I know we are supposed to chose the side with less moles. But if there is a solid on one side of the reaction should we count the moles it contributes or do all of the elem...
by 305421980
Tue Mar 10, 2020 7:08 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5% rule
Replies: 1
Views: 21

5% rule

when determining whether or not we should include the quadratic part of the ICE table what do we check for again to see if the subtracted amount is negligible? What do we make sure is 5% of what?
by 305421980
Sat Mar 07, 2020 7:57 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: E- Chem Equations
Replies: 4
Views: 41

E- Chem Equations

Will the same list of equations used in the most recent test be the same for the final?
by 305421980
Mon Mar 02, 2020 10:44 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6L.7 Part A
Replies: 1
Views: 19

6L.7 Part A

Is there a different procedure for when an equation is at equilibrium? For part A should we just look through the appendix to see which reaction will give us the final sum? The reaction for part A is AgBr(s) <-----> Ag+ (aq) + Br- (aq).
by 305421980
Mon Mar 02, 2020 10:31 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Units for n
Replies: 5
Views: 28

Units for n

For the equation delta G=-nFE, does n have units or no because it is just transferred electrons?
by 305421980
Mon Mar 02, 2020 10:30 pm
Forum: Balancing Redox Reactions
Topic: Both Oxidizing and Reducing Agent
Replies: 4
Views: 46

Both Oxidizing and Reducing Agent

How will we know when a product or reactant is both an oxidizing or reducing agent? Is there a way to tell?
by 305421980
Mon Mar 02, 2020 10:28 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6L.5 Part D
Replies: 1
Views: 43

6L.5 Part D

For the reaction Au+ (aq) ---> Au (s) + Au 3+ (aq), why is it that Au(s) is both the oxidizing and reducing agent? Is it because it is a solid metal therefore need on both sides as the electrode for the cell diagram?
by 305421980
Mon Mar 02, 2020 6:43 pm
Forum: Balancing Redox Reactions
Topic: 6K.3
Replies: 2
Views: 33

Re: 6K.3

****For part d
by 305421980
Mon Mar 02, 2020 6:42 pm
Forum: Balancing Redox Reactions
Topic: 6K.3
Replies: 2
Views: 33

6K.3

In this book problem, how do we find the oxidation half reaction that is happening?
by 305421980
Mon Mar 02, 2020 6:41 pm
Forum: Balancing Redox Reactions
Topic: Oxidation number of 03
Replies: 2
Views: 26

Oxidation number of 03

Why is ozone's oxidation number 0?
by 305421980
Sun Mar 01, 2020 10:17 pm
Forum: Balancing Redox Reactions
Topic: 6K 3 part a)
Replies: 4
Views: 32

Re: 6K 3 part a)

1) the skeletal half reaction for oxidation is (S2O3)2- --> (SO4)2- 2) balance every element other than O and H, so in this case you would balance S giving you (S2O3)2- --> 2(SO4)2- 3)next you balance O and must keep in mind it takes place in an acidic solution. TO do so, you add H2O to balance givi...
by 305421980
Sun Mar 01, 2020 8:27 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: 5.61
Replies: 2
Views: 33

5.61

Would C6H12O6(aq) be included in the equilbruim expression for the photosynthesis reaction 6CO2 (g) + 6H2O (l) <-----> C6H12O6(aq) + 6O2(g)?
If it isn't, why not?
by 305421980
Sun Mar 01, 2020 1:52 am
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: cis and trans entropy
Replies: 3
Views: 40

Re: cis and trans entropy

For cis, like things are on the same side and trans they are opposite. If looking at a square plane with four atoms the order for cis going around would be A, A, B, B and for trans it would be A, B, A, B.
by 305421980
Sun Mar 01, 2020 1:47 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Entropy units
Replies: 7
Views: 65

Re: Entropy units

Normally, because constants use J (like R) you just change all of them to match so the number comes out right.
by 305421980
Sun Mar 01, 2020 1:40 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Very first learning objective on 2nd page of thermodynamics
Replies: 2
Views: 34

Re: Very first learning objective on 2nd page of thermodynamics

Because the equation -RTlnK includes the equilibrium constant and the constant can involve partial pressures.
by 305421980
Sun Mar 01, 2020 1:34 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Outline 4 Learning Objective
Replies: 2
Views: 23

Re: Outline 4 Learning Objective

Because K is included for the Gibbs equation and K can involve partial pressures.
by 305421980
Sun Mar 01, 2020 12:15 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Units for Gibbs
Replies: 3
Views: 30

Re: Units for Gibbs

For example in calculating K in problem 5G21 the units used are only in KJ for the values of delta G
by 305421980
Sun Mar 01, 2020 12:11 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Units for Gibbs
Replies: 3
Views: 30

Units for Gibbs

Why is it that sometimes delta G is in kj and other times it is in kj/mole when each time you have to incorporate moles?
by 305421980
Sat Feb 29, 2020 11:42 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 5G17
Replies: 1
Views: 21

Re: 5G17

Also, why don't the two lines intersect at all? Is it just because K=6.8 is on the larger size?
by 305421980
Sat Feb 29, 2020 11:40 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 5G17
Replies: 1
Views: 21

5G17

For this question, the reaction they ask us to graph is the formation of I(s) from I2(g) but why do they with the reactants and products in the answer for the graph?
by 305421980
Sat Feb 29, 2020 11:31 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Origin of Equilibrium constants for kinetics [ENDORSED]
Replies: 1
Views: 286

Origin of Equilibrium constants for kinetics [ENDORSED]

In section 5G.3 they explain and derive how for the rate constant for a single reaction, forward and reverse leads to the equilibrium constant. They say K=k/k' if k is the rate constant for the forward reaction and k' is the rate constant for the reverse reaction. Does this apply for all reactions? ...
by 305421980
Sat Feb 29, 2020 11:25 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Book Problem 5G13
Replies: 1
Views: 22

Book Problem 5G13

For this problem, they use the reaction I2(g) ---> 2I(s) and for the answer you get a positive delta G using the equation G=-RTlnK + RTlnQ meaning it proceeds towards the reactant in the reaction. What I'm confused about is in the answers it says it is spontaneous so it proceeds towards I2(g), but I...
by 305421980
Thu Feb 27, 2020 2:26 pm
Forum: Biological Examples (*DNA Structural Transitions, etc.)
Topic: Examples Expected to Know
Replies: 10
Views: 108

Re: Examples Expected to Know

The only ones we should know are the ones he mentions in lecture. There are a few on the outline that I don't think he has covered on the lecture and even though they probably wouldn't bw tested on, it is good to know them
by 305421980
Thu Feb 27, 2020 2:16 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: melting point and freezing point
Replies: 1
Views: 29

Re: melting point and freezing point

I believe this is true for all compounds because melting and freezing are included in enthalpy of fusion, it just depends which way you are going for the particular problem or heating curve.
by 305421980
Thu Feb 27, 2020 2:07 pm
Forum: Balancing Redox Reactions
Topic: REDOX Agents
Replies: 9
Views: 51

REDOX Agents

Why are the species that are oxidized called reducing agents and vice versa?
by 305421980
Tue Feb 18, 2020 6:26 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Work
Replies: 14
Views: 90

Re: Work

When work as done on a system it is positive (because its like taking in work potential by having work done on it). When a system does work then the value is negative (because there is an output of work, like when a reaction is exothermic and releasing heat and the heat or enthalpy value is negative).
by 305421980
Tue Feb 18, 2020 6:23 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Constant R
Replies: 15
Views: 95

Re: Constant R

To determine which version of R is used I always look at what other units are being used in the problem and which correspond to the R constant units on the equation sheet.
by 305421980
Tue Feb 11, 2020 10:51 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: State Function
Replies: 3
Views: 26

Re: State Function

Also state functions are properties who's values do not depend on the path required to get there. For example work cannot be a state function because it is reliant on the path (how the work is done).
by 305421980
Tue Feb 11, 2020 10:46 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: State Function
Replies: 3
Views: 26

Re: State Function

The state functions we should know are Pressure, Density, Temperature, Volume, Enthalpy (H), Eternal Energy (U), Gibbs, and Entropy (S).
by 305421980
Tue Feb 11, 2020 10:37 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: q=n*delta H
Replies: 5
Views: 56

q=n*delta H

When is mass or moles times delta H used to calculate q? I believe its only when not dealing with temp changes but for instances like the plateaus on heating curves but I am not sure.
by 305421980
Tue Feb 11, 2020 10:24 pm
Forum: Calculating Work of Expansion
Topic: w=-nRT(ln V2/V1) Derivation
Replies: 3
Views: 23

Re: w=-nRT(ln V2/V1) Derivation

It is derived and given on our equation sheet, just know when to use it.
by 305421980
Tue Feb 11, 2020 10:20 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Eq and Ksp
Replies: 1
Views: 12

Eq and Ksp

I'm a little confused about how Ksp predicts solubility. How is it calculated and what is the trend?
by 305421980
Tue Feb 11, 2020 10:16 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Biological Examples
Replies: 1
Views: 37

Biological Examples

I know these weren't on test 1 but should we know about ATP hydrolysis or osmotic pressure (as listed on the outline) for the midterm?
by 305421980
Mon Feb 10, 2020 10:13 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Joules or KJ?
Replies: 14
Views: 83

Re: Joules or KJ?

I think it depends on what the problem asks for but generally doesn't matter. I would just be careful and make sure when solving everything is matching. Also I know that a lot of times enthalpies use KJ whereas entropy is often in J. So I would just be conscience of units as you go.
by 305421980
Mon Feb 10, 2020 10:01 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: When Ka is small (5% rule)
Replies: 1
Views: 21

When Ka is small (5% rule)

What was the 5% rule again for when we don't need to use the "-x" in determining final concentrations with an ice table? More specifically what vales should we be comparing to double check for the <5% when Ka is small?
by 305421980
Mon Feb 10, 2020 9:57 pm
Forum: Phase Changes & Related Calculations
Topic: Equations for the Midterm
Replies: 1
Views: 30

Equations for the Midterm

I noticed that a few of the more specific work equations and equations to find q for different circumstances are not on the equation sheet but are used some in the homework problems. Will we need to know the ones not on the sheet as well or know how to get them using PV=nRT, etc.?
by 305421980
Mon Feb 10, 2020 9:53 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond enthalpies for Resonance/4E9 [ENDORSED]
Replies: 1
Views: 40

Bond enthalpies for Resonance/4E9 [ENDORSED]

Why are bond enthalpies lower in resonance bonds? And in the answer for 4E9 why is it that the more positive enthalpy means it is more stable?
by 305421980
Sun Dec 08, 2019 9:52 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Ka, Kb, pKa, etc. on Final
Replies: 2
Views: 58

Re: Ka, Kb, pKa, etc. on Final

I think you should just know their relationships and that they are used primarily for weak acids and bases. For example, as one increases, the other decreases.
by 305421980
Sat Dec 07, 2019 9:24 pm
Forum: Bronsted Acids & Bases
Topic: Strong Acids and Bases
Replies: 6
Views: 78

Strong Acids and Bases

Which song acids and bases should we have memorized?
by 305421980
Sat Dec 07, 2019 8:48 pm
Forum: Identifying Acidic & Basic Salts
Topic: reduction of acid rain
Replies: 1
Views: 39

reduction of acid rain

Is the only way to reduce acid rain by reducing emissions?
by 305421980
Sat Dec 07, 2019 1:32 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: H2O and Carbonate
Replies: 3
Views: 44

H2O and Carbonate

Why can't water and carbonate be polydentates?
by 305421980
Sat Dec 07, 2019 1:28 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Diethylenetriamine Tridentate
Replies: 1
Views: 35

Diethylenetriamine Tridentate

Is this a tridentate because of the three lone pairs on the three N's?
by 305421980
Sat Dec 07, 2019 1:22 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate determination
Replies: 1
Views: 32

Polydentate determination

How do we know if a compound is a polydentate?
by 305421980
Sat Dec 07, 2019 1:14 pm
Forum: Naming
Topic: (en), (dien), etc.
Replies: 6
Views: 65

(en), (dien), etc.

Can we use these abbreviations when both naming and writing the formulas for coordination compounds?
by 305421980
Sat Dec 07, 2019 1:06 pm
Forum: Biological Examples
Topic: Chemotherapy drugs
Replies: 7
Views: 78

Chemotherapy drugs

Is cisplatin the main compound we should know for this category of examples?
by 305421980
Sat Dec 07, 2019 12:52 pm
Forum: Biological Examples
Topic: 4 Myoglobin=Hemoglobin
Replies: 1
Views: 27

4 Myoglobin=Hemoglobin

How do 4 myoglobin come together to form a hemoglobin? I understand the octahedral complex but and confused about the transition from myoglobin to hemoglobin.
by 305421980
Mon Dec 02, 2019 10:33 pm
Forum: Bronsted Acids & Bases
Topic: Strong Acids and Bases
Replies: 4
Views: 43

Strong Acids and Bases

DO we need to memorize all of the strong acids and bases?
by 305421980
Mon Dec 02, 2019 9:42 pm
Forum: Naming
Topic: Practice Problem 9.1a
Replies: 1
Views: 34

Practice Problem 9.1a

How do we know which atom is the linking atom to the metal?
by 305421980
Mon Dec 02, 2019 9:40 pm
Forum: Naming
Topic: Table 9C.1
Replies: 6
Views: 63

Table 9C.1

Should we memorize table 9C.1 for naming? Most of them are not too hard to figure out but should we still memorize all of them, even the harder ones, and the formula for the final?
by 305421980
Mon Dec 02, 2019 9:33 pm
Forum: Industrial Examples
Topic: Which examples?
Replies: 3
Views: 66

Which examples?

Which example from the book will we need to understand for testing?
by 305421980
Mon Dec 02, 2019 9:32 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelating Complexes
Replies: 1
Views: 14

Re: Chelating Complexes

For example, what makes the hexadentateiminodisuccinate ion from 9C.2 so able to "scavenge metal ions"?
by 305421980
Mon Dec 02, 2019 9:29 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelating Complexes
Replies: 1
Views: 14

Chelating Complexes

Why are these complexes that chelate able to extract metal ions or bond with other ions? Is it because of the lone pairs and possible bonding sites?
by 305421980
Mon Dec 02, 2019 9:27 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Finding Structures/Polydentates
Replies: 1
Views: 29

Finding Structures/Polydentates

Should we be drawing the Lewis Structures for these complexes to find if they have polydentate properties?
by 305421980
Mon Dec 02, 2019 9:24 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate
Replies: 1
Views: 27

Polydentate

I'm having trouble visualizing this phenomena. Does this only occur with atoms that have a lone pair? What exactly is happening at the ligand bonding sites?
by 305421980
Sat Nov 23, 2019 8:54 pm
Forum: Resonance Structures
Topic: Bond Length/Delocalized Electrons
Replies: 2
Views: 49

Bond Length/Delocalized Electrons

Are all resonance structures because of a delocalized electron?
Does this mean bond length will not be affected ever because of the delocalized electron?
by 305421980
Sat Nov 23, 2019 8:38 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Hydrogen bond Strength
Replies: 3
Views: 35

Hydrogen bond Strength

Compared to other types of bonds, how does hydrogen bonding compare in strength/energy? I was a little confused about the way they explained it in the book.
by 305421980
Sat Nov 23, 2019 8:33 pm
Forum: *Black Body Radiation
Topic: Equation
Replies: 2
Views: 62

Equation

Will we ever need to use the equation described for black body radiation? I know we should at least know block body radiation as a concept but should we ever need to use the actual equation?
by 305421980
Mon Nov 18, 2019 5:06 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Structures for test two
Replies: 1
Views: 27

Structures for test two

Will we need to know all of the structures from the book that weren't talked about in lecture?
by 305421980
Wed Nov 13, 2019 11:49 am
Forum: Octet Exceptions
Topic: Incomplete Octets
Replies: 4
Views: 91

Incomplete Octets

Which atoms can have an incomplete octet? How do we identify them?
by 305421980
Wed Nov 13, 2019 11:48 am
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge vs Octet Rule
Replies: 5
Views: 75

Formal Charge vs Octet Rule

When drawing Lewis Structures should we be more concerns with the octet rule before formal charge?
by 305421980
Wed Nov 13, 2019 11:47 am
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 9
Views: 105

Re: Formal Charge

I always do the calculations on the side just to show my work then write the final numbers small in a small box or underlined by the atoms.
by 305421980
Wed Nov 13, 2019 11:35 am
Forum: Ionic & Covalent Bonds
Topic: covalent bonds
Replies: 7
Views: 67

Re: covalent bonds

The three types we are responsible for are polar, non polar, and coordinate. Polar and non polar have to do with differences in electro negativity whereas coordinate has to do with filling shells by donating/receiving electrons.
by 305421980
Wed Nov 13, 2019 11:34 am
Forum: Ionic & Covalent Bonds
Topic: covalent bonds
Replies: 7
Views: 67

Re: covalent bonds

The three types we are responsible for are polar, non polar, and coordinate. Polar and non polar have to do with differences in electro negativity whereas coordinate has to do with filling shells by donating/receiving electrons.
by 305421980
Wed Nov 13, 2019 11:32 am
Forum: SI Units, Unit Conversions
Topic: Memorizing Conversions
Replies: 23
Views: 282

Re: Memorizing Conversions

everything needed is always provided in the question or on the equation sheet!
by 305421980
Wed Nov 13, 2019 11:30 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Single/Double Bonds in Resonance
Replies: 6
Views: 55

Re: Single/Double Bonds in Resonance

In lecture today he explained that resonance does not need to be explained by more that one VESPR model structure because each bond (single, double, triple) only counts as one. The example he used was carbonate and showed how you only need one VESPR structure.
by 305421980
Tue Nov 05, 2019 7:45 pm
Forum: Properties of Light
Topic: Lecture Tomorrow
Replies: 1
Views: 36

Lecture Tomorrow

Do we have a normal lecture tomorrow? Some people are saying there are no lectures tomorrow and I wasn't sure because of the midterm.
by 305421980
Sun Nov 03, 2019 10:56 pm
Forum: Quantum Numbers and The H-Atom
Topic: Equations we need for midterm
Replies: 7
Views: 135

Re: Equations we need for midterm

Additionally, all of the equations will be provided on the constants and equations paper provided on test day. There is a copy on the website.
by 305421980
Sun Nov 03, 2019 10:53 pm
Forum: Quantum Numbers and The H-Atom
Topic: Formal names for each letter
Replies: 5
Views: 86

Re: Formal names for each letter

n = energy level
l = s, p, d, f classification
ml = axis each spins on

I remember them this way because its easier than the normal vocabulary.
by 305421980
Sun Nov 03, 2019 8:39 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Energy Level Equations
Replies: 1
Views: 29

Energy Level Equations

when/how do we use E=-hR/n^2? Is it only for hydrogen?
by 305421980
Sun Nov 03, 2019 6:23 pm
Forum: DeBroglie Equation
Topic: Does something have wavelike properties?
Replies: 3
Views: 45

Does something have wavelike properties?

What was the threshold for determining whether or not a particle had wavelength properties?
by 305421980
Sun Nov 03, 2019 5:30 pm
Forum: SI Units, Unit Conversions
Topic: Calculate using kg or g?
Replies: 13
Views: 246

Re: Calculate using kg or g?

For most questions involving energy and J, you should convert to kg because the SI base unit is integral in the units. However, a lot of times it is okay just to use grams. It really depends on the units asked for on the specific question.
by 305421980
Sun Nov 03, 2019 5:27 pm
Forum: SI Units, Unit Conversions
Topic: midterm 1
Replies: 5
Views: 90

Re: midterm 1

Although he did briefly cover them in lecture, they shouldn't be on the midterm.
by 305421980
Sun Nov 03, 2019 5:27 pm
Forum: SI Units, Unit Conversions
Topic: midterm 1
Replies: 5
Views: 90

Re: midterm 1

Although he did briefly cover them in lecture, they shouldn't be on the midterm.
by 305421980
Sun Oct 20, 2019 10:29 pm
Forum: Properties of Electrons
Topic: mass of electron, proton, neutron
Replies: 7
Views: 65

Re: mass of electron, proton, neutron

For the masses of each, they are normally provided if needed in a problem. I know most of them are on the constants provided.
by 305421980
Sun Oct 20, 2019 10:27 pm
Forum: DeBroglie Equation
Topic: Particle-wave duality
Replies: 2
Views: 40

Re: Particle-wave duality

The E's in equation are representative of different forms of energy therefore the two equations are not related.
by 305421980
Sun Oct 20, 2019 10:24 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Indeterminacy Equation Confusion
Replies: 2
Views: 58

Re: Heisenberg Indeterminacy Equation Confusion

For the equation, delta x represents the probability of position, so like the equation itself, it is the probability of the election being in a certain spot. In terms of momentum, we just are using non-rotational momentum relative to the mass of the electron and its velocity.
by 305421980
Sun Oct 20, 2019 10:19 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg In 1 Dimension
Replies: 2
Views: 23

Re: Heisenberg In 1 Dimension

I think we will really only using the equation for one dimension problems and just using the 3D models for visual understanding
by 305421980
Sun Oct 13, 2019 11:09 pm
Forum: Properties of Light
Topic: Intensity & Amplitude
Replies: 7
Views: 105

Re: Intensity & Amplitude

In terms of light as a wave, the two are related and have an effect on brightness; as a particle, the intensity and amplitude have no effect on electron emission.
by 305421980
Sun Oct 13, 2019 11:07 pm
Forum: Properties of Light
Topic: Combining Different Equations
Replies: 8
Views: 77

Re: Combining Different Equations

I normally know to combine/mix equations when a certain variable is missing but I know of another equation where the same variable exists and the equation can be rearranged. This often helps in problem solving when I am stuck. I look at the equation sheet and try to fond common variables based on wh...
by 305421980
Sun Oct 13, 2019 11:02 pm
Forum: Einstein Equation
Topic: kJ/mol
Replies: 4
Views: 79

kJ/mol

I have a question regarding one of the post assessment questions (28b) from the atomic spectra module. In this problem, the units kJ/mol are used. In solving it, I just thought to use the kJ->J conversion but still ended up with the wrong answer. I'm not sure if I made just a calculation mistake or ...
by 305421980
Sun Oct 13, 2019 10:58 pm
Forum: Properties of Light
Topic: Atomic Spectra
Replies: 3
Views: 31

Re: Atomic Spectra

yes, in class Dr. Lavelle said for now we only need to know the ranges of each section and not necessarily specific wavelengths
by 305421980
Sun Oct 13, 2019 10:56 pm
Forum: Einstein Equation
Topic: E=hv
Replies: 43
Views: 2641

Re: E=hv

haleyervin7 wrote:When it says we should be able to calculate the number of photons from this equation, we must have the total energy before we can do that, right?

yes, it needs to b e calculated from the work function and kinetic energy values given
by 305421980
Fri Oct 04, 2019 9:45 am
Forum: Molarity, Solutions, Dilutions
Topic: Clarification
Replies: 7
Views: 130

Re: Clarification

When you rearrange the Mol/V=Molarity equation to MV=mol, the equation is put in terms of moles. By setting the rearranged equation equal to the final MV amounts you are basically saying MV=mol=MV because they are both in terms on the same mole amount
by 305421980
Fri Oct 04, 2019 9:29 am
Forum: SI Units, Unit Conversions
Topic: Why do we always need grams when solving a problem?
Replies: 6
Views: 79

Re: Why do we always need grams when solving a problem?

Also, molar mass units are grams/mole; in order to perform dimensional analysis and get to your desired units and answer, you need the correct measurement units to be able to cancel correctly.
by 305421980
Fri Oct 04, 2019 9:22 am
Forum: Limiting Reactant Calculations
Topic: Homework Week 1
Replies: 18
Views: 252

Re: Homework Week 1

I believe Dr. Lavelle said he grades homework based on effort and completion. However, if he did grade it on correctness, the solution manuals are available for us to check our work.
by 305421980
Fri Oct 04, 2019 9:16 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Formula Units
Replies: 4
Views: 82

Formula Units

What's the difference between finding number of atoms or finding number of formula units? I know how to find formula units using dimensional analysis but am confused on the concept of them.

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