## Search found 82 matches

Sat Mar 17, 2018 6:51 pm
Forum: Balancing Redox Reactions
Topic: Basic vs. Acidic Conditions
Replies: 2
Views: 213

### Re: Basic vs. Acidic Conditions

viewtopic.php?f=139&t=28011
here is a post about acidic vs basic balancing equations
Sat Mar 17, 2018 6:48 pm
Forum: Reaction Mechanisms, Reaction Profiles
Replies: 1
Views: 131

We only need to know the pre-equilibrium approach. Steady- State was not covered in class
Thu Mar 15, 2018 2:45 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Solving for Q when given molarity and partial pressure
Replies: 3
Views: 499

### Re: Solving for Q when given molarity and partial pressure

Both partial pressures and concentrations can only be entered into Q when the concentration is in M and partial pressure is in bars. You can use expression equating Kc and Kp to understand why this is possible. so for a question like this: Hg2Cl2(s) + 2e- -> 2Hg(l) + 2Cl-(aq) Enaught = +0.27V 2H+(a...
Thu Mar 15, 2018 2:38 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Test 2 Question 8b
Replies: 9
Views: 823

### Re: Test 2 Question 8b

Wednesday in Dane's section Consider the following unbalanced half reactions Hg2Cl2(s) + 2e- -> 2Hg(l) + 2Cl-(aq) Enaught = +0.27V 2H+(aq) + 2e- -> H2(g) Enaught = 0.00V b) If PH2 = 2.0 bar, [H+] = 3.16x10^4 M and [Cl] = 0.75M, what is Q? For this problem, how to you deal with partial pressure and ...
Thu Mar 15, 2018 2:34 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Test 2 Question 8b
Replies: 9
Views: 823

### Re: Test 2 Question 8b

You had to assume standard conditions, so temperature = 298 K
Wed Mar 14, 2018 12:40 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Slow Step
Replies: 4
Views: 246

### Re: Slow Step

No I dont think the second step would be treated under equilibrium. The rate would just be determined by the slow first step. The second step does not go to equilibrium because the first slow step occurs then the second faster step happens. Equilibrium happens when a later step or second step is slo...
Thu Mar 08, 2018 12:00 am
Forum: General Rate Laws
Topic: Coefficients
Replies: 5
Views: 267

### Re: Coefficients

I believe that these coefficients do not affect how we write the rate laws for first and second order reactions. It would affect the unique rate of the reaction and finding the rates of consumption/production for one reactant/product in terms of another reactant/product's rate of consumption/produc...
Wed Mar 07, 2018 11:52 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8039
Views: 1411004

### Re: Post All Chemistry Jokes Here

What show do Caesium and Iodine love to watch together?
CsI
Wed Mar 07, 2018 11:45 pm
Forum: General Rate Laws
Topic: Coefficients
Replies: 5
Views: 267

### Re: Coefficients

I had the same question because in the page in Lavelle's website (https://lavelle.chem.ucla.edu/wp-content/supporting-files/Chem14B/Kinetics_Integrated_Rate_Laws_Examples.pdf) it says "*In the following derivations of the three integrated rate laws, we assume the stoichiometric coefficient &quo...
Wed Mar 07, 2018 11:29 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8039
Views: 1411004

### Re: Post All Chemistry Jokes Here

What do you call iron blowing in the wind?

Febreeze!
Sat Mar 03, 2018 1:15 pm
Forum: General Rate Laws
Topic: Deriving integrated rate laws
Replies: 4
Views: 274

### Re: Deriving integrated rate laws

Magdalena Palavecino 1A wrote:Does the y=mx+b form refer to anything else than the graphs we looked at in class?

No i dont believe so, the y=mx+b is just to help visualize the graphs better
Sat Mar 03, 2018 12:10 pm
Forum: General Rate Laws
Topic: Integrated Rate Laws when a =/= 1
Replies: 4
Views: 286

### Re: Integrated Rate Laws when a =/= 1

Why is the integrated first-order rate law for that chemical equation ln[A] = ln[A]0 - 2kt?
Fri Mar 02, 2018 5:29 pm
Forum: General Rate Laws
Topic: Determining Order [ENDORSED]
Replies: 8
Views: 402

### Re: Determining Order[ENDORSED]

I think a good way to start is to create a graph if you are given a chemical equation and different experimental data.
like this one.

Then, you use the data (like we did in class) to determine the reaction order of each reactant.
Fri Mar 02, 2018 5:18 pm
Forum: Zero Order Reactions
Topic: slope
Replies: 9
Views: 1318

### Re: slope

[A] is the concentration of the reactants as the reaction continues. For the forward reaction, the concentration of the reactants decrease, and for second order reactions, the graph is graphed 1/[A] vs. time. So if [A] is decreasing over time, the graph will show a line/slope that is increasing (or ...
Fri Mar 02, 2018 3:48 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: E = E^o - (RT/nF) ln Q [ENDORSED]
Replies: 4
Views: 314

### Re: E = E^o - (RT/nF) ln Q[ENDORSED]

For the quiz 2, we were supposed to assume standard conditions and that is why the temperature was 25 degrees Celsuis or 298K.
Sat Feb 24, 2018 11:28 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Strongly Reducing Metals
Replies: 5
Views: 294

### Re: Strongly Reducing Metals

on page 580, it says "the most negative—the most strongly reducing— are usually found toward the left of the periodic table, and the most positive—the most strongly oxidizing—are found toward the upper right."
Sat Feb 24, 2018 11:25 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: n
Replies: 8
Views: 417

### Re: n

What does order of reactants mean?
Thu Feb 22, 2018 11:51 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Pressure in calculating Q
Replies: 4
Views: 242

### Re: Pressure in calculating Q

make sure when you are given the concentrations or pressure that they are the same units!
Thu Feb 22, 2018 11:48 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Current
Replies: 2
Views: 168

### Re: Current

on page 594 of the textbook you can see how current (I) is related to n as n= I*t / F
Sun Feb 18, 2018 3:48 pm
Forum: Balancing Redox Reactions
Topic: 14.11 (d)
Replies: 1
Views: 144

### Re: 14.11 (d)

Hi I found the explanation from another post!

viewtopic.php?t=3354
Sun Feb 18, 2018 10:13 am
Forum: Balancing Redox Reactions
Topic: Balancing redox rxns [ENDORSED]
Replies: 7
Views: 431

### Re: Balancing redox rxns[ENDORSED]

Sat Feb 17, 2018 11:12 pm
Forum: Balancing Redox Reactions
Topic: Transition Metals
Replies: 4
Views: 235

### Re: Transition Metals

Why is the oxidation state for an combined transition metal zero?
Sat Feb 17, 2018 11:02 pm
Forum: Balancing Redox Reactions
Topic: Salt Bridge Versus Pourous Disk
Replies: 6
Views: 411

### Re: Salt Bridge Versus Pourous Disk

Does the salt bridge transfer the ions Na+ and CL-?
Sat Feb 17, 2018 10:55 pm
Forum: Balancing Redox Reactions
Topic: Test #2
Replies: 5
Views: 313

### Re: Test #2

Mon Feb 12, 2018 1:10 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 9.103
Replies: 2
Views: 272

### 9.103

Hi I am a little confused about the solutions manual for this problem. Shouldnt delta G = sum of delta Gf (products) - sum of delta Gf (reactants)? but the solutions manual subtracts all of them.
Mon Feb 12, 2018 1:01 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 9.81
Replies: 2
Views: 172

### Re: 9.81

It doesnt matter which is on the reactant or product side. If Fe3O4 was on the product side (6FeO3 --> 4 Fe3O4 + O2), the delta G would be +391.6 kJ/mol, thus it would mean the formation of Fe3O4 would not be spontaneous and the reaction would favor the reactants (Fe2O3).
Sun Feb 11, 2018 11:45 pm
Forum: Phase Changes & Related Calculations
Topic: Lyndons practice midterm
Replies: 3
Views: 283

### Re: Lyndons practice midterm

Also during the review, Lyndon asked "when you spill water does the water just stay there?" No because the water eventually evaporates. The process is 1)water @ 298K to water @ 373K 2)water phase change from gas to liquid 3)water @373K to water @298K. I think :D
Sat Feb 10, 2018 5:49 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 9.13
Replies: 6
Views: 356

### Re: 9.13

so is there an error in the "Errors in Solution Manual" pdf?
Sat Feb 10, 2018 5:41 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: 8.101 (c) and (f)
Replies: 3
Views: 299

### Re: 8.101 (c) and (f)

I think because the problem doesnt say that the chemical reaction is isothermal, then delta U will not be equal to 0. THat is why part e asks you to calculate the enthalpy.
Sat Feb 10, 2018 4:53 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: 8.93
Replies: 3
Views: 195

### Re: 8.93

Also remember the equation we use is the Ideal Gas Law, so the change in moles would refer to the gases in the chemical equation
Tue Feb 06, 2018 11:32 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 9.27 Entropy
Replies: 3
Views: 249

### Re: 9.27 Entropy

Does that mean that every element has a higher entropy than the proceeding element on the periodic table? Or does there need to be a large difference in size for the entropy to differ? I think the difference in entropy is because of the energy levels. So the element with more entropy has more energ...
Tue Feb 06, 2018 8:59 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 9.13
Replies: 6
Views: 356

### Re: 9.13

Why doesnt this problem use Cv or Cp, but uses the equation deltaS=n*R*ln(T2/T1)?
Mon Feb 05, 2018 10:30 pm
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: "Favorability"
Replies: 5
Views: 387

### Re: "Favorability"

If the outcome is favorable, it also means that the reaction is favorable, so the reaction is favoring the products. This can be determined from a negative delta G value.
Mon Feb 05, 2018 10:27 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Unstable and Stable Compounds
Replies: 2
Views: 203

### Re: Unstable and Stable Compounds

The delta G is for the reaction. This means that when the delta G is negative, the products are favored. If the delta G is positive, then the reactants are favored
Mon Feb 05, 2018 10:17 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Superheating
Replies: 3
Views: 236

### Re: Superheating

A good way to see what you need to know on the Tests is looking over the outlines!
Mon Feb 05, 2018 10:13 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Question 8.31
Replies: 7
Views: 470

### Re: Question 8.31

If you do the caculation, the change of Celcius and the change in Kelvin will be the same.
Mon Feb 05, 2018 10:07 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 5
Views: 420

### Re: Midterm

Yup he announced it today! and on the website
https://lavelle.chem.ucla.edu/wp-conten ... ns_14B.pdf
Mon Feb 05, 2018 10:05 pm
Forum: Balancing Redox Reactions
Topic: Salt Bridges?
Replies: 6
Views: 272

### Re: Salt Bridges?

The salt bridges allow there to be a circuit because without the salt bridge the anode will stay negative and the cathode side will be positive. The bridge allows for the flow to continue
Wed Jan 24, 2018 1:54 pm
Forum: Administrative Questions and Class Announcements
Topic: When can we pick up our finals from Chem 14A?
Replies: 3
Views: 462

### Re: When can we pick up our finals from Chem 14A?

If we see a mistake on the grading of the Final are we able to change our grade?
Tue Jan 23, 2018 2:07 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 8.45- why do you multiply?
Replies: 5
Views: 237

### Re: 8.45- why do you multiply?

so for part B the solutions manual divides the enthalpy of reaction by 4 mol C (358.8kJ/4 mol C) to find the enthalpy of one mole of C?
Tue Jan 23, 2018 1:59 pm
Forum: Administrative Questions and Class Announcements
Topic: Formula Sheet
Replies: 2
Views: 233

### Re: Formula Sheet

https://lavelle.chem.ucla.edu/wp-conten ... ations.pdf
here is the one he will be providing on the test
Tue Jan 23, 2018 1:53 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: 8.25
Replies: 1
Views: 116

### Re: 8.25

I think this is because any change in temperature of Celcius is the same as a change in temperature of Kelvin.
Sat Jan 20, 2018 1:13 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Ch 8 #53 Part b
Replies: 7
Views: 502

### Re: Ch 8 #53 Part b

I also have a question about why we use q=C(delta)T instead of q=nC(delta)T
Mon Jan 15, 2018 9:34 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Q 8.13
Replies: 9
Views: 531

### Re: Q 8.13

947 kJ of energy is leaving the system as heat to the surrounding
Mon Jan 15, 2018 8:03 pm
Forum: Phase Changes & Related Calculations
Topic: Open/Closed/Isolated
Replies: 11
Views: 588

### Re: Open/Closed/Isolated

In a closed system, only energy is able to be exchanged with its surroundings, but in an isolated system, neither mass or energy is able to be exchanged.
Mon Jan 15, 2018 7:47 pm
Forum: Calculating Work of Expansion
Topic: Will we be given conversion factors on the exam? [ENDORSED]
Replies: 3
Views: 269

### Re: Will we be given conversion factors on the exam?[ENDORSED]

For Chem 14A we were given a sheet with formulas, conversions, and the periodic table, so I would assume that he will give us a similar sheet, but I am not sure.
Mon Jan 15, 2018 7:43 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: U = q + w assumptions
Replies: 5
Views: 384

### Re: U = q + w assumptions

On page 262 and 263, it says that work is calculated under the assumption that the external pressure is constant, so I think we assume constant pressure for (change)U= q+w.
Thu Jan 11, 2018 10:20 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Significant Figure [ENDORSED]
Replies: 7
Views: 857

### Re: Significant Figure[ENDORSED]

Thu Jan 11, 2018 10:16 pm
Forum: Phase Changes & Related Calculations
Topic: Open, Closed, or Isolated Systems
Replies: 6
Views: 6112

### Re: Open, Closed, or Isolated Systems

Also thermometers work because the liquid (mercury) expand or compress depending on the heat transfer between the mercury and the surrounding, so it is a closed system
Thu Jan 11, 2018 10:08 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: 8.1 part c [ENDORSED]
Replies: 8
Views: 689

### Re: 8.1 part c[ENDORSED]

Also a bomb calorimeter the mass and energy (ex:heat) of the system is not exchanged with its surroundings.
Thu Jan 11, 2018 10:02 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Differences in the delta Hs
Replies: 2
Views: 221

### Re: Differences in the delta Hs

I believe that delta H subscript c is the Standard enthalpy change of combustion or the change in enthalpy per mole of a substance that is burned in a combustion reaction under standard conditions. I dont know about the subscript h. I found this on page 291 of the textbook.
Fri Dec 08, 2017 10:36 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: XeO2F2
Replies: 3
Views: 2985

### XeO2F2

is XeO2F2 polar or nonpolar?
Fri Dec 08, 2017 10:19 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: CBr2Cl2
Replies: 2
Views: 347

### CBr2Cl2

is CBr2Cl2 polar or nonpolar?
Sun Dec 03, 2017 10:27 pm
Forum: *Shrodinger Equation
Topic: What does this even mean?
Replies: 4
Views: 590

### Re: What does this even mean?

The equation gives the probability of finding an electron around an atom. The atomic orbitals are a physical representation of the equation
Sun Dec 03, 2017 10:07 pm
Forum: Bronsted Acids & Bases
Topic: How do I identify if a molecule is a Bronsted Acid or Base?
Replies: 5
Views: 596

### Re: How do I identify if a molecule is a Bronsted Acid or Base?

whats the difference between a Lewis acid/base and a Bronsted acid/ base?
Wed Nov 29, 2017 12:21 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelates
Replies: 2
Views: 245

### Re: Chelates

I think polydentates, which are ligands that bind to the transition metal or central atom more than once, so I think specifically bidentates create a "ring of atoms"
Tue Nov 28, 2017 11:01 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Solvents
Replies: 2
Views: 186

### Re: Solvents

A change in solvent concentration is insignificant and will cancel out, so solvents like H2O are not used
Sun Nov 26, 2017 9:24 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Finding The Direction of Reaction
Replies: 5
Views: 316

### Re: Finding The Direction of Reaction

Does favoring one side mean that there is more of reactant than product (favors left) or more product than reactant(favors right)?
Sun Nov 26, 2017 9:17 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: How can you determine if a complex is a polydentate?
Replies: 5
Views: 596

### Re: How can you determine if a complex is a polydentate?

So polydentate ligands have more than one bonding site to the central atom?
Tue Nov 21, 2017 3:36 pm
Forum: Naming
Topic: Ligand Names
Replies: 6
Views: 382

### Re: Ligand Names

I think you should remember the coordination compound names from Lavelle's website.
https://lavelle.chem.ucla.edu/wp-conten ... pounds.pdf
Tue Nov 21, 2017 3:35 pm
Forum: Naming
Topic: Diaqaua
Replies: 9
Views: 521

### Re: Diaqaua

You can use this link when naming coordination compounds or find it on Lavelle's website
https://lavelle.chem.ucla.edu/wp-conten ... pounds.pdf
Sun Nov 19, 2017 6:06 pm
Forum: Hybridization
Topic: Hybridization
Replies: 6
Views: 351

### Re: Hybridization

Does hybridization also allow for lower stability?
Sun Nov 19, 2017 5:51 pm
Forum: Naming
Topic: Naming
Replies: 2
Views: 217

### Re: Naming

I think we put (OH2) or (H2O) when we are writing the ligand's structure to reference which element is attached to the transition metal.
Wed Nov 08, 2017 10:36 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: HW 3.83
Replies: 6
Views: 1517

### Re: HW 3.83

So does that mean cations have higher polarization power, and anions have higher polarizability?
Wed Nov 08, 2017 10:27 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Topics
Replies: 1
Views: 174

### Re: Midterm Topics

Yes, I think you should know those series. Lyman series is Ultraviolet light and electrons ground state is n=1. Balmer series is Visible light and the electron's ground state is n=2.
Wed Nov 01, 2017 11:39 pm
Forum: Resonance Structures
Topic: Hybrid bonds
Replies: 2
Views: 259

### Re: Hybrid bonds

I think the book means that that resonance is the hybrid of all the resonance structures, or all the structures together. This is the actual structure of the molecule. 1.5 bond is the average of a single bond and a double bond.
Wed Nov 01, 2017 11:24 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Wave Function
Replies: 2
Views: 257

### Re: Wave Function

Schrodinger's equation? I do not think we have to know how to use the equation, just the conceptual idea and what the equation tells us, which is the probability of finding an electron in a certain area.
Mon Oct 30, 2017 4:05 pm
Forum: Trends in The Periodic Table
Topic: Fluorine's Formal Charge
Replies: 1
Views: 275

### Re: Fluorine's Formal Charge

Fluorine with a +1 charge is highly unstable because that means it has lost an electron, so now it has 6 valence electrons. However, originally the parent form of Fluorine would have 7 valence electrons, which is one less electron from becoming an octet (most stable). Therefore, having fluoride with...
Sat Oct 28, 2017 3:28 pm
Forum: Electronegativity
Topic: Electron affinity vs Electronegativity vs. Ionization energy [ENDORSED]
Replies: 2
Views: 1067

### Re: Electron affinity vs Electronegativity vs. Ionization energy[ENDORSED]

Hi I thank you for the clarification. I was just wondering why more electron affinity (the energy released when an electron is added to a gas phase atom) is released when you go across the table.
Fri Oct 27, 2017 3:34 pm
Forum: Lewis Structures
Topic: Octet Rule [ENDORSED]
Replies: 9
Views: 1009

### Re: Octet Rule[ENDORSED]

Hi I am still a little confused. So do the electrons go to to the 3d orbital for P, S, and Cl?
Mon Oct 23, 2017 10:01 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Confusion on e- Notes
Replies: 2
Views: 201

### Re: Confusion on e- Notes

He also said in the lecture that the chemical short hands are encouraged to be used on quizzes and tests
Mon Oct 23, 2017 9:58 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: e- configuration of ions
Replies: 1
Views: 136

### e- configuration of ions

Hi in the lecture, Lavelle said that there are two ions of Iron (Fe) Fe^2+ : [Ar]3d^6 and Fe^3+ :[Ar]3d^5. I was wondering which one is more common? And is there Fe^4+ :[Ar]3d^4?
Sun Oct 22, 2017 3:55 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Week 4 [ENDORSED]
Replies: 5
Views: 421

### Re: Week 4[ENDORSED]

I had a similar question will quiz 3 have Heisenberg’s indeterminacy equation and Schrodinger's equation? or will quiz 3 just have Lewis Structures?
Sun Oct 22, 2017 3:44 pm
Forum: Quantum Numbers and The H-Atom
Topic: Wave Properties of Electron and the De Broglie Equation Post Assessment, Q.35
Replies: 2
Views: 262

### Re: Wave Properties of Electron and the De Broglie Equation Post Assessment, Q.35

The wavelength 6.94 x 10-38 m is not measurable in an experiment. The electric car sends a wavelength, but it is too small to be measured in an experiment thus it is hard to conclude that there are wavelike properties for an electric car.
Sun Oct 22, 2017 3:28 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Test 3 [ENDORSED]
Replies: 5
Views: 504

### Test 3[ENDORSED]

Hi will test 3 have Heisenberg’s indeterminacy equation and Schrodinger's equation? or will Test 3 just have Lewis Structures? Thanks!
Sat Oct 14, 2017 9:09 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: H Equation [ENDORSED]
Replies: 6
Views: 510

### Re: H Equation[ENDORSED]

I believe in the lecture Lavelle said that the equations given were for Hydrogen atoms. I do not know if we need to know equations for other elements
Sat Oct 14, 2017 8:54 pm
Forum: Properties of Light
Topic: Understanding the Rydberg Formula [ENDORSED]
Replies: 6
Views: 562

### Re: Understanding the Rydberg Formula[ENDORSED]

I am also confused about the reason of the negative symbol in the equation.
Sat Oct 14, 2017 8:43 pm
Forum: Properties of Light
Topic: Color at the Quantum Level [ENDORSED]
Replies: 2
Views: 259

### Re: Color at the Quantum Level[ENDORSED]

Each color has a specific wavelength. Color is the aspect of things that is caused by differing qualities of light being reflected or emitted by them. I do not think color has to do with the "excess" energy leftover when an electron moves up an energy level.
Thu Oct 05, 2017 10:05 pm
Forum: SI Units, Unit Conversions
Topic: Exercise E35
Replies: 2
Views: 295

### Re: Exercise E35

Someone in my Discussion asked this question and my TA said that the equation for percent change is dividing by the original value. I believe the book had it wrong.
Thu Oct 05, 2017 12:40 pm
Forum: SI Units, Unit Conversions
Topic: Sig Figs
Replies: 12
Views: 1221

### Re: Sig Figs

If it was .5060 and you wrote it in scientific notation, It would be 5.060 x 10^-1 so would there be 3 or 4 sig figs? There would be 4 sig figs in .5060 or 5.060 x 10^-1 because the numbers "5" and "6" sandwich the zero in between them, thus making the first zero significant. fo...
Thu Oct 05, 2017 12:39 pm
Forum: SI Units, Unit Conversions
Topic: Sig Figs
Replies: 12
Views: 1221

### Re: Sig Figs

There would be 4 sig figs in .5060 or 5.060 x 10^-1 because the numbers "5" and "6" sandwich the zero in between them, thus making the first zero significant. for the last zero it is significant because any zero after the decimal point that is not a placeholder is significant. Th...
Wed Oct 04, 2017 9:05 pm
Forum: SI Units, Unit Conversions
Topic: Sig Figs
Replies: 12
Views: 1221

### Re: Sig Figs

I believe 460 has two sig figs because the zero is just a place holder and the period after "898." is supposed to be a decimal point. I think they are mainly used to say that a zero is significant.