Search found 108 matches
- Fri Mar 12, 2021 8:35 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Are catalysts consumed?
- Replies: 37
- Views: 1662
Re: Are catalysts consumed?
catalysts are not consumed in the rxn process
- Fri Mar 12, 2021 8:33 pm
- Forum: Calculating Work of Expansion
- Topic: Negative Work
- Replies: 30
- Views: 1163
Re: Negative Work
when a system does work, the value for work will be negative.
- Fri Mar 12, 2021 8:29 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Anode and Cathode
- Replies: 25
- Views: 1206
Re: Anode and Cathode
yes that is correct, that relationship is always true
- Fri Mar 12, 2021 8:26 pm
- Forum: General Rate Laws
- Topic: Intermediate
- Replies: 59
- Views: 3504
Re: Intermediate
an intermediate is something produced and later consumed in a series of rxns but does not appear in the ovr rxn.
- Fri Mar 12, 2021 8:24 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Lowering Activation Energy
- Replies: 34
- Views: 1110
Re: Lowering Activation Energy
yes, the catalyst lowers activation for the reverse rxn
- Fri Mar 12, 2021 8:20 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Delta G and G naught
- Replies: 46
- Views: 4355
Re: Delta G and G naught
Delta g naught is delta g at standard conditions
- Sun Mar 07, 2021 11:59 pm
- Forum: Experimental Details
- Topic: Rate Laws
- Replies: 8
- Views: 1226
Re: Rate Laws
They are determined through experimental data.
- Sun Mar 07, 2021 11:44 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Third Order Reactions
- Replies: 4
- Views: 241
Re: Third Order Reactions
Third order is a very rare occurrence so I think we just need to know the the general idea, not so much the solving.
- Sun Mar 07, 2021 11:34 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Determining Anode vs Cathode
- Replies: 23
- Views: 872
Re: Determining Anode vs Cathode
Anode is where you have oxidation half-reaction and cathode is where you have a reduction half-reaction.
- Sun Mar 07, 2021 11:32 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Salt Bridges
- Replies: 12
- Views: 534
Re: Salt Bridges
Salt bridges connect anode and cathode and help keep reduction and oxidation solution from building up positive/negative charges, essentially keeps the cell working
- Sun Mar 07, 2021 11:30 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K
- Replies: 33
- Views: 1242
Re: K
Kc is the constant for molar concentrations.
- Thu Feb 25, 2021 11:15 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: E° for a cell
- Replies: 5
- Views: 299
Re: E° for a cell
It's an intensive property so it will stay constant throughout.
- Thu Feb 25, 2021 11:12 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidizing vs Reducing
- Replies: 55
- Views: 2226
Re: Oxidizing vs Reducing
OIL RIG is probably best and most common. (Oxidizing loses electrons, Reducing gains electrons)
- Thu Feb 25, 2021 11:10 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Salt Bridge
- Replies: 30
- Views: 1281
Re: Salt Bridge
a salt bridge helps keep electrical neutrality in the circuit
- Thu Feb 25, 2021 11:08 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Units for delta G
- Replies: 31
- Views: 1782
Re: Units for delta G
once things cancel out, we are just left with kj for units
- Thu Feb 25, 2021 11:08 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Cell Diagram
- Replies: 21
- Views: 1113
Re: Cell Diagram
If its not given, typically just assume cathode is on the right, anode on left
- Sun Feb 21, 2021 11:59 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: qrev
- Replies: 27
- Views: 1483
Re: qrev
qrev is the amount of heat transferred in a reversible process
- Sun Feb 21, 2021 11:58 pm
- Forum: Phase Changes & Related Calculations
- Topic: State Property
- Replies: 71
- Views: 2893
Re: State Property
All you need is final and initial values, the values at other points are irrelevant when solving and they are not accounted for
- Sun Feb 21, 2021 11:57 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Entropy value
- Replies: 17
- Views: 814
Re: Entropy value
Sign is probably more important in most cases, - meaning non-spontaneous, + spontaneous
- Sun Feb 21, 2021 11:54 pm
- Forum: Ideal Gases
- Topic: Temperature
- Replies: 99
- Views: 5696
Re: Temperature
if this is the case, then yes, you should just assume 25 C or 298K
- Sun Feb 21, 2021 11:54 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Delta G v Delta G Naught
- Replies: 9
- Views: 477
Re: Delta G v Delta G Naught
At equilibrium they should be both 0, but otherwise, deltaG naught is at standard conditions whereas deltaG is actual conditions
- Sun Feb 21, 2021 11:51 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Gas Constant R
- Replies: 43
- Views: 3697
Re: Gas Constant R
Not necessarily, it depends more on units. Eg: if joules are in the problem, it is probably going to be the 8.314 value for R.
- Mon Feb 15, 2021 9:01 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: R Constant
- Replies: 91
- Views: 5178
Re: R Constant
The best way is to just match your units in the equation with the units for R
- Mon Feb 15, 2021 8:59 pm
- Forum: Ideal Gases
- Topic: R ideal gas constant
- Replies: 31
- Views: 1953
Re: R ideal gas constant
Depending on the units in your equation, different r values will be needed.
- Mon Feb 15, 2021 8:57 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Free Energy
- Replies: 49
- Views: 1881
Re: Free Energy
State functions are path independent meaning only starting and ending values are important and this is the case with free energy.
- Mon Feb 15, 2021 8:55 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: n in q=nCdeltaT
- Replies: 16
- Views: 688
Re: n in q=nCdeltaT
n is typically moles, but depending on units in the equation, it may need to be in grams.
- Mon Feb 15, 2021 8:54 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Isothermal Reactions
- Replies: 26
- Views: 1168
Re: Isothermal Reactions
Yes, I believe it is on a reversible pathway
- Sun Feb 07, 2021 8:59 pm
- Forum: Ideal Gases
- Topic: Gas Constant Value
- Replies: 43
- Views: 1416
Re: Gas Constant Value
They're all on the sheet we get for exams so no need to memorize, however you should be familiar with how to use them depending on units.
- Sun Feb 07, 2021 8:58 pm
- Forum: Ideal Gases
- Topic: Units for K
- Replies: 29
- Views: 1118
Re: Units for K
I think all units cancel in the calculation so that k wouldn't have units
- Sun Feb 07, 2021 8:56 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Can heat capacities be negative?
- Replies: 52
- Views: 13512
Re: Can heat capacities be negative?
q can be negative but the actual heat capacity will still be positive I believe.
- Sun Feb 07, 2021 8:54 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Positive and Negative q Value
- Replies: 19
- Views: 12866
Re: Positive and Negative q Value
q is negative when heat is being released (exothermic) and q is positive when heat is being absorbed (endothermic)
- Sun Feb 07, 2021 8:53 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Closed System
- Replies: 52
- Views: 2581
Re: Closed System
its sealed but not always insulated
- Sun Jan 31, 2021 11:44 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: change in celsius = change in kelvin
- Replies: 22
- Views: 7590
Re: change in celsius = change in kelvin
the change in temperature will be the same for both, whether its in degrees C or Kelvin. 278K-273K=5K and 15 deg C - 10 deg C = 5 deg C as well.
- Sun Jan 31, 2021 11:40 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Exothermic vs Extothermic
- Replies: 13
- Views: 401
Re: Exothermic vs Extothermic
exothermic rxn's lose heat to surroundings and endothermic rxn's gain heat/energy so the surroundings become cooler
- Sun Jan 31, 2021 11:38 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K vs. Kc
- Replies: 36
- Views: 1215
Re: K vs. Kc
i'm pretty sure they're basically the same but it could be kp or kc depending on a specific problem
- Sun Jan 31, 2021 11:36 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: is HClO3 weak or strong? [ENDORSED]
- Replies: 49
- Views: 3964
Re: is HClO3 weak or strong? [ENDORSED]
i think in this class its considered a strong acid
- Sun Jan 31, 2021 11:33 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: converting T to kelvin
- Replies: 46
- Views: 3271
Re: converting T to kelvin
since its the change in temp, it doesn't matter really which you use but if you want to go to kelvin its just degrees celsius +273
- Sun Jan 31, 2021 11:31 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: State Function
- Replies: 22
- Views: 707
Re: State Function
i believe it's due to the fact that work depends on distance and force
- Sun Jan 24, 2021 8:43 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: pKa
- Replies: 14
- Views: 461
Re: pKa
pKa = -log pKa
- Sun Jan 24, 2021 8:36 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: approximating
- Replies: 10
- Views: 387
Re: approximating
you can only take x from the denominator if k<then 10^-4, never from the numerator.
- Sun Jan 24, 2021 8:34 pm
- Forum: Ideal Gases
- Topic: Q and K relationship
- Replies: 22
- Views: 771
Re: Q and K relationship
Q is anytime and K is at equilibrium. If you can't remember how these 2 influence which way the reaction leans towards, write k before q (alphabetical order) and them put the </> and based on your values, this symbol will tell you which way it leans. An easy trick!
- Sun Jan 24, 2021 8:31 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Approximately x
- Replies: 18
- Views: 612
Re: Approximately x
when k is less than 10^-4 if you want to be safe but check percent ionization to make sure!
- Sun Jan 17, 2021 10:56 pm
- Forum: General Science Questions
- Topic: Significant Figures and Rounding
- Replies: 9
- Views: 442
Re: Significant Figures and Rounding
It is pretty flexible in this class as exams are mc thus you don't need to worry about rounding and sig figs. The same goes for sapling hw as I've never had an issue with rounding at the end. It's good to know all the rules though
- Sun Jan 17, 2021 10:53 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: X less than 5 percent
- Replies: 11
- Views: 837
Re: X less than 5 percent
Yes, if its greater than 5% than the approximation is not valid.
- Sun Jan 17, 2021 10:51 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Making the Assumption that Change x is Small
- Replies: 4
- Views: 228
Re: Making the Assumption that Change x is Small
10E-3 but double check the % ionization to make sure its under 5%. If it's not, the approximation is not accurate.
- Sun Jan 17, 2021 10:50 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Getting two positive x values when using quadratic
- Replies: 43
- Views: 4585
Re: Getting two positive x values when using quadratic
you should test them to see if one might give you a negative concentration. if that is the case, you can rule that value out.
- Sun Jan 17, 2021 10:48 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: q vs k
- Replies: 62
- Views: 2365
Re: q vs k
when q=k, it is at equilibrium
- Sun Jan 10, 2021 9:51 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Units
- Replies: 27
- Views: 867
Re: Units
Im pretty sure that both can be used
- Sun Jan 10, 2021 9:50 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K vs. Q
- Replies: 53
- Views: 1919
Re: K vs. Q
Yes, it is the same equation but k is at equilibrium.
- Sun Jan 10, 2021 9:49 pm
- Forum: Ideal Gases
- Topic: PV=nRT
- Replies: 74
- Views: 4204
Re: PV=nRT
P is Pressure, V is Volume, n is number of moles, R is the gas constant, and T is Temperature
- Sun Jan 10, 2021 9:48 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Q and K
- Replies: 46
- Views: 1550
Re: Q and K
yes, k is measured at equilibrium
- Sun Jan 10, 2021 9:46 pm
- Forum: Ideal Gases
- Topic: reversing reactions
- Replies: 83
- Views: 4832
Re: reversing reactions
It would become 1/k
- Wed Dec 16, 2020 12:40 am
- Forum: Resonance Structures
- Topic: Valence Electrons [ENDORSED]
- Replies: 46
- Views: 3671
Re: Valence Electrons [ENDORSED]
its the number of electrons in thee outer shell but you can also just memorize by the column the element is in
- Wed Dec 16, 2020 12:38 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Bond Angles
- Replies: 12
- Views: 561
Re: Bond Angles
the bond angle is less than 109.5
- Wed Dec 16, 2020 12:36 am
- Forum: Biological Examples
- Topic: Hemoglobin vs. Myoglobin
- Replies: 30
- Views: 1218
Re: Hemoglobin vs. Myoglobin
Hemoglobin contains 4 myoglobin, transporting oxygen around the body
- Sun Dec 06, 2020 10:51 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Bond Order
- Replies: 14
- Views: 969
Re: Bond Order
The molecule would be too unstable in this case
- Sun Dec 06, 2020 10:49 pm
- Forum: Naming
- Topic: oxidation number
- Replies: 3
- Views: 197
Re: oxidation number
The oxidation state of Pt is +4 and the overall charge of the molecule is -2
- Sun Dec 06, 2020 10:38 pm
- Forum: Lewis Structures
- Topic: Most Stable Structure
- Replies: 23
- Views: 3453
Re: Most Stable Structure
Structures that have the least amount of formal charge are most stable.
- Sun Dec 06, 2020 10:34 pm
- Forum: Lewis Structures
- Topic: Lewis Structure for CO
- Replies: 3
- Views: 890
Re: Lewis Structure for CO
You typically want formal charge of zero but O and C need to satisfy the octet rule. Therefore you need to use a triple bond because you have a total of 10 valence electrons to use.
- Sun Dec 06, 2020 10:30 pm
- Forum: Bond Lengths & Energies
- Topic: Higher Melting Point
- Replies: 28
- Views: 2488
Re: Higher Melting Point
Due to increased atomic radius, bigger atom means higher boiling point.
- Sun Dec 06, 2020 10:13 pm
- Forum: Administrative Questions and Class Announcements
- Topic: last day of lecture
- Replies: 12
- Views: 600
Re: last day of lecture
I think Dr. Lavelle said Wednesday.
- Sun Nov 29, 2020 10:50 pm
- Forum: Properties of Electrons
- Topic: What does this symbol mean?
- Replies: 18
- Views: 2310
Re: What does this symbol mean?
That symbol is called alpha and it means "proportional to"
- Sun Nov 29, 2020 10:44 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Shape Names
- Replies: 50
- Views: 2283
Re: Shape Names
Yes, H2O is considered bent.
- Sun Nov 29, 2020 10:40 pm
- Forum: Limiting Reactant Calculations
- Topic: Cl vs Cl2
- Replies: 9
- Views: 7116
Re: Cl vs Cl2
O and Cl are both diatomic molecules so they will have the 2 subscript.
- Sun Nov 29, 2020 10:36 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Resonance Structure Definition
- Replies: 9
- Views: 474
Re: Resonance Structure Definition
Molecular formula will remain the same but position and types of bonds can change. This will cause some structures to be more or less stable.
- Sun Nov 29, 2020 10:33 pm
- Forum: Bond Lengths & Energies
- Topic: Boiling/Melting Point
- Replies: 29
- Views: 1143
Re: Boiling/Melting Point
You would look at intermolecular interactions because those are the interactions between molecules
- Sun Nov 29, 2020 10:30 pm
- Forum: Octet Exceptions
- Topic: PCl5 expanded octet question
- Replies: 6
- Views: 910
Re: PCl5 expanded octet question
Phosphorus is in period 3 thus it can accommodate more than an octet or electrons
- Sun Nov 29, 2020 10:25 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: AsO43-
- Replies: 9
- Views: 422
Re: AsO43-
The charges cancel out so there is no net dipole moment.
- Sun Nov 22, 2020 8:44 pm
- Forum: Lewis Structures
- Topic: Electron Density
- Replies: 14
- Views: 601
Re: Electron Density
Electron density is the probability that an atom would be found in a region of an orbital.
- Sun Nov 22, 2020 8:42 pm
- Forum: Electronegativity
- Topic: Electronegativity versus atomic radius
- Replies: 8
- Views: 1126
Re: Electronegativity versus atomic radius
Electronegativity is highest at the top right of the p-table and atomic radius will be lowest there.
- Sun Nov 22, 2020 8:40 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: CH3F Molecular Shape
- Replies: 7
- Views: 1949
Re: CH3F Molecular Shape
It is a tetrahedral.
- Sun Nov 22, 2020 8:37 pm
- Forum: Lewis Structures
- Topic: Central Atom Question
- Replies: 20
- Views: 1111
Re: Central Atom Question
No, H can never be the central atom.
- Sun Nov 22, 2020 8:35 pm
- Forum: Electronegativity
- Topic: Periodic trend
- Replies: 17
- Views: 892
Re: Periodic trend
Yes, you are right!
- Sun Nov 15, 2020 10:30 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 3d and 4s orbitals
- Replies: 4
- Views: 1204
Re: 3d and 4s orbitals
3d should always come before 4s in an electron configuration even though when looking at a periodic table 4s will come before 3d.
- Sun Nov 15, 2020 10:26 pm
- Forum: Resonance Structures
- Topic: Sapling #4
- Replies: 6
- Views: 411
Re: Sapling #4
You need to keep the same molecular formula and make sure that your valence electrons still add up correctly. For one of my structures, I just flipped which Oxygen had the double bond, and for the second I made the C-N a double bond (C=N).
- Sun Nov 15, 2020 10:18 pm
- Forum: Electronegativity
- Topic: General Idea of Electronegativity [ENDORSED]
- Replies: 3
- Views: 261
Re: General Idea of Electronegativity [ENDORSED]
Yea, you should know the more electronegative elements are in the top right of the table and also that fluorine is the most electronegative element with a value of 4. If EN difference is > 2, it is an ionic bond. If EN difference is <1.5, it is covalent. That is a rough guideline.
- Sun Nov 15, 2020 10:13 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Electronegativity chart for Midterm
- Replies: 7
- Views: 333
Re: Electronegativity chart for Midterm
I think we only get the periodic table and formula sheet for the midterm. In his lectures, I recall Dr. Lavelle saying that we don't need to know specific electronegativity values, but just the general trend. You should probably know that fluorine is the most electronegative element with a value of ...
- Sun Nov 15, 2020 10:09 pm
- Forum: Bond Lengths & Energies
- Topic: Valence electrons of nitrogen
- Replies: 10
- Views: 421
Re: Valence electrons of nitrogen
Nitrogen itself has 5 valence electrons but when bonding it will need a complete octet (8 valence electrons).
- Sun Nov 08, 2020 11:38 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Are there subshells past f?
- Replies: 28
- Views: 1031
Re: Are there subshells past f?
I believe so but we won't be going over those in this course.
- Sun Nov 08, 2020 11:36 pm
- Forum: DeBroglie Equation
- Topic: Solving for v
- Replies: 7
- Views: 380
Re: Solving for v
You can manipulate the equation and just swap the lambda with the v to get v=h/mlambda
- Sun Nov 08, 2020 11:34 pm
- Forum: Einstein Equation
- Topic: E=pc vs E=hv
- Replies: 15
- Views: 731
Re: E=pc vs E=hv
E=hv is used more for the problems with finding energy of a photon but e=pc can be used when you know momentum (mass x velocity)
- Sun Nov 08, 2020 11:31 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Noble Gas Configuration
- Replies: 13
- Views: 479
Re: Noble Gas Configuration
Doing either format should be fine unless specified in a question
- Sun Nov 08, 2020 10:59 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: wavelength
- Replies: 13
- Views: 534
Re: wavelength
No, wavelength is always a positive value
- Mon Nov 02, 2020 8:22 am
- Forum: Octet Exceptions
- Topic: Boron
- Replies: 8
- Views: 457
Re: Boron
Boron only has 3 bonds, so it is an exception.
- Mon Nov 02, 2020 8:21 am
- Forum: Ionic & Covalent Bonds
- Topic: hydrogen
- Replies: 19
- Views: 863
Re: hydrogen
Hydrogen has to be bonded with Nitrogen, Oxygen, or Fluorine.
- Mon Nov 02, 2020 8:19 am
- Forum: Properties of Light
- Topic: Wavelenght
- Replies: 17
- Views: 666
Re: Wavelenght
No, they have the lowest wavelengths
- Sun Nov 01, 2020 9:20 pm
- Forum: DeBroglie Equation
- Topic: Sapling #10
- Replies: 3
- Views: 240
Sapling #10
Can someone please help with following problem from sapling? Thanks!
The average speed of a diatomic fluorine molecule at 25 ∘C is 442.4 m⋅s−1 . What is the average wavelength of a fluorine molecule at this temperature? Assume that the molecule acts as a single particle.
The average speed of a diatomic fluorine molecule at 25 ∘C is 442.4 m⋅s−1 . What is the average wavelength of a fluorine molecule at this temperature? Assume that the molecule acts as a single particle.
- Sun Nov 01, 2020 9:11 pm
- Forum: Photoelectric Effect
- Topic: Lyman Series
- Replies: 30
- Views: 1130
Re: Lyman Series
Since Lyman Series is talking about Uv region, you should assume n1=1
- Sun Nov 01, 2020 8:53 pm
- Forum: Significant Figures
- Topic: When should I start looking at sig figs?
- Replies: 31
- Views: 1379
Re: When should I start looking at sig figs?
Yea, I think it is best to not round or worry about sig figs until the very final answer. This way you avoid any errors from that.
- Sun Oct 25, 2020 10:13 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: N reaching infinity
- Replies: 3
- Views: 467
Re: N reaching infinity
Yea at this level, the atom loses an electron but I don't think this can actually occur because the energy levels just get closer and closer as they approach infinity.
- Sun Oct 25, 2020 10:07 pm
- Forum: General Science Questions
- Topic: When to use sig figs
- Replies: 19
- Views: 700
Re: When to use sig figs
To be safe, keep everything exact until the final answer and then worry about sig figs.
- Sun Oct 25, 2020 10:04 pm
- Forum: Photoelectric Effect
- Topic: Frequency and energy
- Replies: 15
- Views: 506
Re: Frequency and energy
Yes the amount of energy will increase as frequency increases. h in the E=hv is constant so as v increases, so will E.
- Sun Oct 25, 2020 10:01 pm
- Forum: Properties of Electrons
- Topic: Properties of Electrons
- Replies: 4
- Views: 231
Re: Properties of Electrons
Yes, increasing light intensity will not increase the energy of the photons
- Sun Oct 25, 2020 9:59 pm
- Forum: Properties of Light
- Topic: Amplitude
- Replies: 9
- Views: 480
Re: Amplitude
Yes, it's only in the wave model
- Sun Oct 25, 2020 9:58 pm
- Forum: Properties of Light
- Topic: Speed of light
- Replies: 25
- Views: 746
Re: Speed of light
In the past I've used 3.00 but now I just use the constants that are on the provided page by Dr. Lavelle. However it should not make a big difference on a multiple choice exam.
- Sun Oct 18, 2020 11:16 pm
- Forum: Properties of Electrons
- Topic: Energy levels
- Replies: 8
- Views: 446
Re: Energy levels
The gaps are smaller because it takes less energy to excite the electrons as energy level increases.
- Sun Oct 18, 2020 10:37 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Tests
- Replies: 6
- Views: 216
Re: Tests
Based on what I heard during last discussion, you have to use respondus for the actual test and then have another device for the camera that is aimed at your workspace.
- Sun Oct 18, 2020 10:31 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Preference on Scientific Notation
- Replies: 13
- Views: 707
Re: Preference on Scientific Notation
As far as writing it out for yourself, whatever works best for you is fine! Our exams are multiple choice (at least the midterms are, not sure about the final) so you'll just be given the answers to choose from so it doesn't really matter.
- Sun Oct 18, 2020 10:28 pm
- Forum: Einstein Equation
- Topic: m vs nm
- Replies: 66
- Views: 3309
Re: m vs nm
When wavelength is used in the formulas, you typically need it in meters so that units cancel out. I'm sure that there will be questions (like the one on the practice quiz we took) where you get wavelength in nm and need to put it in m before you plug in. As long as you memorize the conversion, you ...
- Sun Oct 18, 2020 10:23 pm
- Forum: Significant Figures
- Topic: Sig Figs and Scientific Notation
- Replies: 10
- Views: 593
Re: Sig Figs and Scientific Notation
No, I'm pretty sure that it doesn't count!