Search found 80 matches
- Sat Mar 12, 2022 10:44 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: A in Arrhenius Equation
- Replies: 8
- Views: 245
Re: A in Arrhenius Equation
A is the frequency factor, which basically is how frequent, with a value (probability) between 0 and 1, will the particles be in the correct orientation with enough energy to collide, overcome the activation energy barrier, and react. The value of A will be given to us.
- Sat Mar 12, 2022 10:41 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Textbook 7.1
- Replies: 3
- Views: 141
Re: Textbook 7.1
Kinetic control predominates at lower temperatures since there is not enough energy to overcome the higher activation energy associated with a thermodynamically favored product.
- Fri Mar 11, 2022 8:24 pm
- Forum: General Rate Laws
- Topic: Half life
- Replies: 1
- Views: 93
Half life
on question 7.21, the plots of "(f) initial rate against [A] for a reaction that is first order in A; (g) half-life against [A] for a reaction that is zeroth order in A; " are linear. How come they are linear?
- Fri Mar 11, 2022 8:14 pm
- Forum: General Rate Laws
- Topic: Question 7.17
- Replies: 3
- Views: 123
Question 7.17
question 7.17 says "A catalyst is added that accelerates the third step only. What effect, if any, will the catalyst have on the rate of the overall reaction?" and the answer key says there is no effect. How come there is no affect?
- Fri Mar 11, 2022 8:04 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Kinetic Control
- Replies: 7
- Views: 295
Kinetic Control
Why does kinetic control predominate at lower temperatures in comparison to higher temperaturess?
- Thu Mar 03, 2022 2:48 am
- Forum: Balancing Redox Reactions
- Topic: Electrons in redox reactions
- Replies: 37
- Views: 1412
Re: Electrons in redox reactions
Yes they are! but when u add the oxidation and reduction portions, they should cancel out. just remember the reduction reactions gain electrons so the electrons should be on the left, and for oxidation half reactions they should be on the right.
- Thu Mar 03, 2022 2:46 am
- Forum: Balancing Redox Reactions
- Topic: When to add electrons
- Replies: 16
- Views: 468
Re: When to add electrons
Id balance the charges by adding electrons at the very end, after balancing ur elements!
- Thu Mar 03, 2022 2:45 am
- Forum: Balancing Redox Reactions
- Topic: acidic and basic redox reactions
- Replies: 11
- Views: 385
acidic and basic redox reactions
What is the procedure for balancing a redox reaction in a basic solution? I only know how to do acidic, not sure what to do.
- Thu Mar 03, 2022 2:44 am
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Temperature and K
- Replies: 2
- Views: 163
Temperature and K
Can someone explain how the function with two T's and two K's works? Also, what is the intuition behind the relationship?
- Thu Mar 03, 2022 2:41 am
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Entropy of irreversible/reversible systems
- Replies: 3
- Views: 157
Entropy of irreversible/reversible systems
Can someone explain how entropy works for irreversible and reversible systems? I know that total entropy of a reversible system is 0 but how does that work? Why is that not the case for an irreversible system?
- Thu Mar 03, 2022 2:33 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Standard Hydrogen cell reduction potential
- Replies: 5
- Views: 197
Standard Hydrogen cell reduction potential
Can someone explain the purpose of comparing standard reduction potentials to hydrogen reduction potentials and how it works?
- Thu Mar 03, 2022 2:32 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Battery metal
- Replies: 7
- Views: 241
Battery metal
How do I know when to include an extra metal conductor in a cell diagram?
- Thu Mar 03, 2022 2:31 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: residual entropy
- Replies: 6
- Views: 328
residual entropy
how does residual entropy work, especially in the context of symmetrical molecules?
- Thu Mar 03, 2022 2:30 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: oxidizing/reducing agent
- Replies: 7
- Views: 287
oxidizing/reducing agent
Can someone explain what this concept is, and how it related to standard reduction cell potential?
- Thu Mar 03, 2022 2:29 am
- Forum: Balancing Redox Reactions
- Topic: cathode anode oxidation reduction
- Replies: 5
- Views: 287
cathode anode oxidation reduction
Does anyone have a good pneumonic to remember how to memorize oxidation and reduction reactions as well as how they're related in a battery?
- Sun Feb 20, 2022 10:34 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: comparing values to standard hydrogen electrode
- Replies: 1
- Views: 81
comparing values to standard hydrogen electrode
What is the purpose of comparing e- transfer of all cells to a hydrogen electrode? And why does doing this achieve its purpose?
- Sun Feb 20, 2022 10:26 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: calculating Eo of cell
- Replies: 1
- Views: 66
calculating Eo of cell
In class we calculated Eo in two ways, by writing half reactions and flipping the sign of the anode, or taking E(cathode)-E(anode). In terms of the standard reduction values given, are they always going to be positive?
- Sun Feb 20, 2022 10:22 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: intensive properties
- Replies: 7
- Views: 293
intensive properties
What does it mean that reduction potentials are intensive? How does this affect the way we calculate cell potential?
- Sun Feb 20, 2022 10:21 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Platinum cathode, resulting ions
- Replies: 1
- Views: 72
Platinum cathode, resulting ions
If platinum is the solid, where are the Fe2+/3+ ions coming from? how do they get into the solution?
- Sun Feb 20, 2022 10:21 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: platinum cathodes
- Replies: 2
- Views: 118
platinum cathodes
Why do we need platinum on the cathode side instead of just the metal being reduced itself?
- Sun Feb 13, 2022 9:56 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: acid base
- Replies: 3
- Views: 217
acid base
does anyone have a link to a list of acids and bases we need to memorize for the test? Also, any tips on memorizing these?
- Sun Feb 13, 2022 9:54 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Neutralization Reactions
- Replies: 3
- Views: 112
Re: Neutralization Reactions
since acids and bases are fully dissociated, no bonds are broken. however, bonds are formed between H+ and OH-, which is an exothermic process.
- Sun Feb 13, 2022 9:51 pm
- Forum: Phase Changes & Related Calculations
- Topic: heat of vaporization vs melting
- Replies: 13
- Views: 507
heat of vaporization vs melting
Why does water vapor produce more severe burns than boiling water at the same temperature?
- Sun Feb 13, 2022 9:50 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Molar Heat Capacity at Constant Volume
- Replies: 3
- Views: 96
Re: Molar Heat Capacity at Constant Volume
multiply heat capacity by the number of moles and the change in temperature
- Sun Feb 13, 2022 9:49 pm
- Forum: Calculating Work of Expansion
- Topic: Heat Capacity
- Replies: 15
- Views: 435
Re: Heat Capacity
Hi Vanessa!
Heat is an extensive property because all we measure is the initial and final temperatures. What occurs in the middle is irrelevant. Other extensive properties are altitude.
Hope this helps!
Best,
Andrew Sun
Heat is an extensive property because all we measure is the initial and final temperatures. What occurs in the middle is irrelevant. Other extensive properties are altitude.
Hope this helps!
Best,
Andrew Sun
- Fri Feb 04, 2022 11:02 pm
- Forum: Calculating Work of Expansion
- Topic: Cp and Cv
- Replies: 2
- Views: 82
Cp and Cv
In achieve 18, the equation Cv=Cp-R was used. Did we ever go over this in class? Also, why does this relationship exist, and how? Why are we using R?
- Fri Feb 04, 2022 11:01 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Qcal+Qreaction=0
- Replies: 5
- Views: 427
Qcal+Qreaction=0
Can someone explain how the relationship of Qcal+Qreaction=0?
- Fri Feb 04, 2022 11:00 pm
- Forum: Calculating Work of Expansion
- Topic: irreversible vs reversible processes
- Replies: 3
- Views: 110
irreversible vs reversible processes
I know for irreversible processes, we use w=-pdelta(v) and for reversible processes we take an integral. However, what about constant pressure makes a process irreversible? I'm struggling conceptually how to piece it together, especially in terms of why we use an integral for one but not the other.
- Fri Feb 04, 2022 10:58 pm
- Forum: Calculating Work of Expansion
- Topic: using Pv=nrt
- Replies: 17
- Views: 653
using Pv=nrt
When can I use PV=nRT? I thought that since it's called the ideal gas law the conditions had to be ideal (pressure and temperature).
- Fri Feb 04, 2022 10:57 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Qcal
- Replies: 6
- Views: 608
Qcal
For Qcal, how come its Ccal*delta(t)? where did the mass go or do we not have to account for ir?
- Sun Jan 30, 2022 4:12 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: achieve 14
- Replies: 4
- Views: 191
achieve 14
was the equation for achieve #14 in the thermo questions discussed in class? entirely sure how to use it, any guidance would be greatly appreciated!
- Sun Jan 30, 2022 4:08 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Energy of an Isolated System
- Replies: 5
- Views: 199
Re: Energy of an Isolated System
I think about the first law of thermodynamics and how the universe is a perfect system where the heat of the system and heat of the surroundings are always exchanged to each other. When we examine delta H along the lines of your thinking, i think it would be for the entire system, and we know that t...
- Sun Jan 30, 2022 4:04 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: q=mcdeltat
- Replies: 4
- Views: 249
q=mcdeltat
In the problems where we equate mcdeltat=-mcdeltat, why is there a negative sign? Shouldn't the inherent characteristic of temperature decreasing naturally produce a negative answer?
- Sun Jan 30, 2022 4:02 pm
- Forum: General Science Questions
- Topic: Midterm 1 content
- Replies: 4
- Views: 230
Midterm 1 content
Hi,
Will Monday's lecture be a part of midterm 1? Some of the achieve problems utilize equations that we haven't learned. Do we need to know them for the midterm?
Will Monday's lecture be a part of midterm 1? Some of the achieve problems utilize equations that we haven't learned. Do we need to know them for the midterm?
- Sat Jan 29, 2022 11:04 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: achieve #12
- Replies: 1
- Views: 75
achieve #12
For week 3/4 achieve problem #12, why do we use c=q/delta(t) instead of c=q/n*delta(t)?
- Sun Jan 23, 2022 5:53 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Hess's Law
- Replies: 5
- Views: 157
Hess's Law
Does manipulating equations change delta H the same way that manipulating acid/base equations change K?
- Sun Jan 23, 2022 5:46 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: diatomic molecules
- Replies: 6
- Views: 220
diatomic molecules
Why are bond enthalpies of diatomic molecules accurate?
- Sun Jan 23, 2022 5:38 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: State fuctions and state properties
- Replies: 3
- Views: 109
State fuctions and state properties
Can someone explain to me the concept of state properties and state functions? are they the same thing
- Sun Jan 23, 2022 5:37 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: enthalpy
- Replies: 10
- Views: 295
enthalpy
Can someone explain to me how endothermic and exothermic reactions relate to the formation and breaking of bonds?
- Sun Jan 23, 2022 5:35 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: M1V1=M2V2
- Replies: 11
- Views: 427
M1V1=M2V2
Can someone explain to me how to use this formula and when I would use it?
- Sat Jan 15, 2022 11:28 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: acid base pairs
- Replies: 5
- Views: 150
acid base pairs
how come a strong acid is correlated with a weak conjugate base?
- Sat Jan 15, 2022 11:25 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: buffers
- Replies: 5
- Views: 542
buffers
Can someone explain to me what a buffer is? It seems to be something that makes the pH of the solution less likely to change, but how does it work on a molecular level?
- Sat Jan 15, 2022 11:22 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: introducing new gas to increase pressure
- Replies: 2
- Views: 111
introducing new gas to increase pressure
I know that Dr. Lavelle said that introducing new gases doesn't shift equilibrium. However, how come it doesn't cause the reaction to shift towards the side with less moles? I think conceptually I am unsure.
- Sat Jan 15, 2022 11:20 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: nitrogen
- Replies: 2
- Views: 131
nitrogen
how do I know if a nitrogen in a molecule will cause the molecule to be basic or acidic?
- Sat Jan 15, 2022 11:15 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: change in K
- Replies: 2
- Views: 63
Re: change in K
K changes for temperature because when temperature is changed, it is an external factor in which the system must adjust for without additional products or reactants introduced into the mix. Since the amount of products and reactants are held unchanged prior to any changes in temperature, then the on...
- Sat Jan 08, 2022 6:10 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Finding K value
- Replies: 8
- Views: 196
Re: Finding K value
Those should be provided in the question. Alternatively, you could solve for partial pressures using PV=NRT if you're given concentration and need to convert it.
- Sat Jan 08, 2022 6:06 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: if K<10^-4
- Replies: 3
- Views: 142
if K<10^-4
If K is less than 10^-4, can we only approximate for concentrations in which there is an initial concentration given?
ie. in lecture, we only approximated N2 and O2 since they had initial concentrations, but not N20 which we were solving an equilibrium concentration for.
ie. in lecture, we only approximated N2 and O2 since they had initial concentrations, but not N20 which we were solving an equilibrium concentration for.
- Sat Jan 08, 2022 5:51 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Endo vs exo reactions
- Replies: 3
- Views: 111
Endo vs exo reactions
Can someone explain why an exothermic reaction favors R formation? How does creating R use up heat?
- Sat Jan 08, 2022 5:49 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: No change to K with pressure
- Replies: 4
- Views: 152
Re: No change to K with pressure
[P]/[R] changes immediately after the change in volume, so it would actually be classified as Q. In lavelles example, K is 100 and Q is 25. However, over time Q will work its way up back to K through the reaction converting from reactants to products to decrease the amount of moles in the container,...
- Sat Jan 08, 2022 5:44 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE Tables
- Replies: 5
- Views: 183
Re: ICE Tables
Hello Vanessa! Great question, I was wondering the same thing for myself! You use an ice table to find the concentrations at equilibrium for a reaction when you're not given the equilibrium concentrations. Don't forget that if the K value is less than 10^-4 you can approximate x to be zero for items...
- Wed Dec 05, 2018 9:25 am
- Forum: Bronsted Acids & Bases
- Topic: Proton transfer
- Replies: 1
- Views: 332
Re: Proton transfer
CH3COOH --> CH3CONH2?
Well, the compound does gain a Hydrogen, and if that is true, then the compound must be a base. However, we also see that the compound loses the OH- and gains a NH2-, further proving that CH3COOH is a base.
Well, the compound does gain a Hydrogen, and if that is true, then the compound must be a base. However, we also see that the compound loses the OH- and gains a NH2-, further proving that CH3COOH is a base.
- Wed Dec 05, 2018 9:20 am
- Forum: Bronsted Acids & Bases
- Topic: How to identify Acids/Bases
- Replies: 4
- Views: 574
Re: How to identify Acids/Bases
If you are given a compound, identify the compound that loses an H+. For example, if in the reaction h3o+ becomes h2o, then you know that it lost a H+, or donated that. that compound will be an acid.
- Wed Dec 05, 2018 9:17 am
- Forum: Lewis Acids & Bases
- Topic: Identifying the acid and base
- Replies: 3
- Views: 445
Re: Identifying the acid and base
What is the acid and base in these reactions? a. CH3NH2 (aq) + H30+ (aq) ---> CH3NH3+ (aq) + H20 (l) b. CH3NH2 (aq) + CH3COOH (aq) ---> CH3NH3+ (aq) + CH3CO2- (aq) c. 2 HI (aq) + Ca0 (s) ---> CaI2 (aq) + H20 (l) acids are the compounds that donate an H+, so: 1. acid - H3O+ 2. CH3COOH 3.HI the bases ...
- Fri Nov 30, 2018 3:55 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: H-Bonding and Dipole Dipole
- Replies: 2
- Views: 325
Re: H-Bonding and Dipole Dipole
when hydrogen bonding exists, dipole dipole exists. However, the vice versa is not true, as if dipole dipole exists, it may not be hydrogen bonding as H needs to be attracted to N,O, or F.
- Fri Nov 30, 2018 3:50 pm
- Forum: Hybridization
- Topic: 2s or s?
- Replies: 7
- Views: 640
Re: 2s or s?
if a question asks what is the hybridization around the central atom, does it need a coefficient to specify which energy level?
- Fri Nov 30, 2018 3:48 pm
- Forum: Bronsted Acids & Bases
- Topic: Bronsted vs Lewis
- Replies: 3
- Views: 319
Re: Bronsted vs Lewis
If an acid is an electron acceptor, whilst giving away the H+ (which is essentially a proton), how does it take in another electron? or does the electron already exist to the acid?
- Fri Nov 23, 2018 8:05 am
- Forum: Hybridization
- Topic: Writing Pi Bonds
- Replies: 2
- Views: 309
Re: Writing Pi Bonds
The pi bond is not the entire double bond, just the single bond on top of the preexisting sigma bond. For example, a double bond consists of one sigma bond (C2sp2) and a pi bond (C2p).
- Mon Nov 19, 2018 11:27 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone Pair distortion
- Replies: 2
- Views: 286
Re: Lone Pair distortion
A lone pair takes up more space in terms of it's electron cloud or density, so it'll push the other bonds closer together, resulting in a lower bond angle.
- Mon Nov 19, 2018 11:20 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Double bonds
- Replies: 8
- Views: 803
Double bonds
Is there a way to dictate double bonds in our VSEPR drawings? If we have to draw in lone pairs, is there anything else we need to do as well to closer match the elements depicted by lewis structures?
- Mon Nov 12, 2018 4:27 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Dipoles
- Replies: 5
- Views: 439
Re: Dipoles
Essentially you want to determine if the molecule is polar or non polar, and this will allow you to figure out if there will be dipoles. Using electronegativity values, if u calculate the difference between values and find that it is 0.5 or greater, then the molecule will be polar and therefore have...
- Mon Nov 12, 2018 4:15 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: 6.1 Sixth Edition Intermolecular Forces
- Replies: 2
- Views: 3071
Re: 6.1 Sixth Edition Intermolecular Forces
CBr4 would have a VSEPR shape that is tetrahedral, and since the difference between carbon and bromine electronegativity values are 0.3 (2.8(br)-2.5(c)), the molecule is non-polar. Therefore, the only IMFs that would be present in a non-polar molecule are london dispersion forces.
- Mon Nov 12, 2018 4:13 pm
- Forum: Dipole Moments
- Topic: Dipole Moments and Polar Molecules
- Replies: 2
- Views: 275
Re: Dipole Moments and Polar Molecules
You find the difference in electronegativity values between the elements, and if the difference is greater than 0.5 than the molecule will be polar towards the more negative atom. However, if all atoms point towards - for example - a central atom, then the molecule is non-polar as there is no overal...
- Wed Nov 07, 2018 9:13 am
- Forum: Electronegativity
- Topic: Electronegativity calculation
- Replies: 4
- Views: 1555
Re: Electronegativity calculation
To calculate electronegativity, you simply take the difference between the two elements. And using these values, you can see if the compound is polar or nonpolar, as well as having possibly ionic characters or covalent.
- Wed Nov 07, 2018 9:09 am
- Forum: Ionic & Covalent Bonds
- Topic: Covalent attributes [ENDORSED]
- Replies: 2
- Views: 303
Covalent attributes [ENDORSED]
Hello! Could someone explain why going down a family will increase covalent attributes? I think where I get confused is that since the atomic radius is increasing down a family, so that means it'll hold on to the cation with less force, and therefore act like an ionic compound and be more soluble. t...
- Wed Nov 07, 2018 9:03 am
- Forum: Trends in The Periodic Table
- Topic: electron affinity
- Replies: 2
- Views: 503
Re: electron affinity
I would assume no, as they already have filled orbitals.
- Mon Oct 29, 2018 11:54 am
- Forum: Ionic & Covalent Bonds
- Topic: Formal Charges
- Replies: 3
- Views: 358
Formal Charges
Do the formal charges of each individual element of an ion always add up to the overall charge of the ion?
- Mon Oct 29, 2018 11:48 am
- Forum: Ionic & Covalent Bonds
- Topic: 2B.7
- Replies: 3
- Views: 403
Re: 2B.7
Some elements can have expanded octets, as explained in lecture on 10/29. Those elements that are in the third row can have expanded octets because the now have a d-orbital as well.
- Mon Oct 29, 2018 11:44 am
- Forum: Quantum Numbers and The H-Atom
- Topic: Finding number of elements that have given quantum numbers
- Replies: 1
- Views: 285
Re: Finding number of elements that have given quantum numbers
id just locate the fifth row of the periodic table, and then focus on the l value and which orbital it correlates to. For your example, it would be the p orbital, which means only 6 elements would have n=5 and l=1, those elements in the p block of the 5th row
- Tue Oct 23, 2018 5:36 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: When to double the parameter to get delta v
- Replies: 3
- Views: 559
Re: When to double the parameter to get delta v
if a question says the speed is 3.24 +/- 0.06 m/s, would delta V be 0.12 m/s?
- Tue Oct 23, 2018 5:31 pm
- Forum: Properties of Light
- Topic: EM Energy Spectrum
- Replies: 4
- Views: 406
Re: EM Energy Spectrum
pretty sure the values of frequencies will be given to us in the problem. Most problems state v= blank so i dont see why it wouldnt for those as well.
- Tue Oct 23, 2018 5:28 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Angular Momentum Quantum Numbers
- Replies: 3
- Views: 449
Re: Angular Momentum Quantum Numbers
quantum number for l just describes the shape. It isnt necessarily always going to be l=n-1. For example, the third energy level has s, p, and d orbitals, meaning you can have l=0,1 or 2 for which electron you are describing.
- Wed Oct 17, 2018 2:28 pm
- Forum: *Shrodinger Equation
- Topic: Using the Equation
- Replies: 2
- Views: 268
Re: Using the Equation
The equation gives us the probability of finding an electron at a certain location/position, at an orbital or a cloud. I heard we won't be needing to know how to use the formula, just to understand its purpose.
- Tue Oct 16, 2018 10:04 pm
- Forum: Ionic & Covalent Bonds
- Topic: Electron Configuration of Cations
- Replies: 8
- Views: 852
Re: Electron Configuration of Cations
It would just be the electron represented on the most right. for example, element (II) would have s2p5 and element(I) would be s2p4.
- Tue Oct 16, 2018 10:00 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Indeterminacy vs. Uncertainty?
- Replies: 4
- Views: 401
Re: Indeterminacy vs. Uncertainty?
They're interchangeable terms, but i think Lavelle said something about uncertainty being used too often, and that indeterminacy is used because it is less used, if that makes any sense. However, im sure it doesnt make a difference what you use in terms of vocabulary or tests/quizzes.
- Fri Oct 12, 2018 1:37 pm
- Forum: DeBroglie Equation
- Topic: Measurable wavelengths
- Replies: 3
- Views: 173
Re: Measurable wavelengths
In my 10-11 lecture, he said when the value is x10^-18 or more, someone asked that question too in my class. However, not sure what makes that value suddenly detectable as compared to other values, like if it is a specific threshold or boundary of a value.
- Fri Oct 12, 2018 1:35 pm
- Forum: Einstein Equation
- Topic: Delta E values
- Replies: 2
- Views: 587
Re: Delta E values
Yes, when the original calculation gives a negative value it just signifies that there was a negative change overall, but you can't have negative energy. The negative sign is just there for conceptual understanding.
- Fri Oct 12, 2018 1:32 pm
- Forum: Significant Figures
- Topic: Calculators
- Replies: 20
- Views: 1758
Re: Calculators
I use a TI-30X and it works wonders. Also heard a few of the Casio ones have a fraction button that would help you organize or visualize your work better!
- Tue Oct 02, 2018 8:59 pm
- Forum: Balancing Chemical Reactions
- Topic: Problem H. 11
- Replies: 3
- Views: 251
Re: Problem H. 11
the coefficients are 0,4,3,4
- Tue Oct 02, 2018 8:51 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Confused about molarity concept
- Replies: 4
- Views: 656
Re: Confused about molarity concept
i think it means you need to mix in 9.8ml (the answer) of the 0.0380M KmNO4 into say a volumetric flask, then fill it up to 0.250L with water, and that will create the 1.50x10^-3M solution of KmNO4. At least I think that is how it can be interpreted, open to other thoughts
- Tue Oct 02, 2018 8:47 pm
- Forum: SI Units, Unit Conversions
- Topic: Audio-Visual Focus-Topics, Assessments & Surveys
- Replies: 16
- Views: 1523
Re: Audio-Visual Focus-Topics, Assessments & Surveys
Currently doing the modules, and for the ones in which topics were covered in class, the problems he does are the same as the ones from class. Seems useful for reviewing for tests or if you miss class, or want to review prior to class though