Search found 101 matches
- Tue Mar 10, 2020 11:59 am
- Forum: *Enzyme Kinetics
- Topic: Catalysts
- Replies: 8
- Views: 1061
Re: Catalysts
The catalyst lowers the activation energy, making it easier for both the forward and reverse reactions to occur, thus speeding them both up.
- Tue Mar 10, 2020 11:58 am
- Forum: Experimental Details
- Topic: determining order of reaction
- Replies: 6
- Views: 673
Re: determining order of reaction
We should either be given the graph to figure it out or given the information for an experiment.
- Tue Mar 10, 2020 11:58 am
- Forum: Environment, Ozone, CFCs
- Topic: stoichiometric coefficients
- Replies: 19
- Views: 1416
Re: stoichiometric coefficients
It's correct whether in fraction or whole number form, because the equations we use relate the two in ratio form anyways.
- Tue Mar 10, 2020 11:57 am
- Forum: Zero Order Reactions
- Topic: Zero Order
- Replies: 8
- Views: 473
Re: Zero Order
Zero order reactions depend only on K, because [A]^0 =1, so it doesn't effect the rate.
- Tue Mar 10, 2020 11:55 am
- Forum: Second Order Reactions
- Topic: [A] v. Time
- Replies: 27
- Views: 1145
Re: [A] v. Time
For a second order reaction, it would be linear.
- Sun Mar 08, 2020 10:34 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Diamond
- Replies: 6
- Views: 433
Re: Diamond
Over a very very long period of time graphite will turn to diamond, but graphite is in its more stable energy form. It has a super high activation energy/energy barrier though
- Sun Mar 08, 2020 10:33 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: thermodynamically stable
- Replies: 6
- Views: 468
Re: thermodynamically stable
When something has a lower delta G, it's in a lower energy form, and thus less likely to react. If it's prone to stay in the lowest energy form, or in reactants, you can tell that it's thermodynamically stable
- Sun Mar 08, 2020 10:32 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: derivations
- Replies: 9
- Views: 573
Re: derivations
Make sure to look at your notes for the first rate, second rate, and zero rate reactions. They're all pretty similar but it's important to know where they come from, especially when looking at the half life equations.
- Sun Mar 08, 2020 10:31 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: kinetically stable?
- Replies: 10
- Views: 689
Re: kinetically stable?
Means that it's stable enough to stay in reactant form- basically has a high energy barrier but still a negative G value.
- Sun Mar 08, 2020 10:30 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: instantaneous rate
- Replies: 16
- Views: 932
Re: instantaneous rate
Instantaneous rate breaks up into infinite intervals, whereas average relies only on the data points you're given so it's far less accurate.
- Sun Mar 01, 2020 4:00 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Metals in solution
- Replies: 2
- Views: 196
Re: Metals in solution
"dissolving" in essence is losing electrons. Thus, as oxidation happens as part of the half reaction on metals, electrons are being lost and the metal is dissolving away
- Sun Mar 01, 2020 3:59 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: C(gr) state
- Replies: 4
- Views: 271
Re: C(gr) state
Means graphite form of carbon, helpful to know that this is one of the more stable forms
- Sun Mar 01, 2020 3:58 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram (phases)
- Replies: 2
- Views: 147
Re: Cell Diagram (phases)
Electrode | Solid | liquid, liquid | aq |(salt bridge)| aq |liquid | solid | electrode
- Sun Mar 01, 2020 3:57 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Salt Bridge
- Replies: 10
- Views: 476
Re: Salt Bridge
Salt bridge allows for ion transfer when anode and cathode are completely isolated from each other
- Sun Mar 01, 2020 3:56 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: precipitation reactions
- Replies: 3
- Views: 263
Re: precipitation reactions
if there are no solids in the reactants, but are in the products, can consider a precipitation reaction.
- Sun Feb 23, 2020 7:26 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: F
- Replies: 7
- Views: 429
Re: F
It is the charge of 6.02 x 10^23 electrons
- Sun Feb 23, 2020 7:25 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidation Numbers- How to Find
- Replies: 3
- Views: 327
Re: Oxidation Numbers- How to Find
we only know the oxidation number for certain specific elements, but you can determine the oxidation numbers you know for the other elements using the ones you know combined with the final charge
- Sun Feb 23, 2020 7:25 pm
- Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
- Topic: rust
- Replies: 9
- Views: 695
Re: rust
The elections gained by iron in the process, or the reduction, is the forming of the rust in the reaction
- Sun Feb 23, 2020 7:24 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: voltage
- Replies: 8
- Views: 376
Re: voltage
Voltage is the amount of energy to the electric charge, and one volt is equal to one joule of energy for each coulomb of charge
- Sun Feb 23, 2020 7:22 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Half reactions
- Replies: 13
- Views: 720
Re: Half reactions
The half reactions are the individual Reduction and Oxidation reactions of a Redox reaction
- Mon Feb 17, 2020 7:10 pm
- Forum: Environment, Fossil Fuels, Alternative Fuels
- Topic: Energy Density
- Replies: 10
- Views: 4817
Re: Energy Density
How would you go about calculating energy density?
- Mon Feb 17, 2020 7:09 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: Boltzman's Entropy Equation
- Replies: 4
- Views: 392
Re: Boltzman's Entropy Equation
Microstates refers to the possible arrangements, so for example, when calculating W, it would be micro states ^ # of atoms
- Mon Feb 17, 2020 7:08 pm
- Forum: Calculating Work of Expansion
- Topic: Reversible vs Irreversible
- Replies: 13
- Views: 840
Re: Reversible vs Irreversible
For a reversible equation, total entropy would be equal to zero. For something like combustion, that is irreversible, you would have a significant change in entropy
- Mon Feb 17, 2020 7:07 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: When to use the different equations
- Replies: 5
- Views: 389
Re: When to use the different equations
You can only use the ∆G°=-RTlnK equation when the system in question is at equilibrium, otherwise you have to use the other equations.
- Mon Feb 17, 2020 7:06 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Isolated vs Closed [ENDORSED]
- Replies: 34
- Views: 4098
Re: Isolated vs Closed [ENDORSED]
If a water bottle is vacuum sealed, then technically heat is not escaping so no energy is being exchanged with the surrounding environment
- Sun Feb 09, 2020 7:51 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: First Law of Thermodynamics Definition
- Replies: 4
- Views: 221
Re: First Law of Thermodynamics Definition
Technically, it applies to all systems because energy is never lost its just transferred to "the universe", or the greater system that every isolated system is technically part of.
- Sun Feb 09, 2020 7:50 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Entropy Question
- Replies: 3
- Views: 161
Re: Entropy Question
yes, because the number of different positions are directly correlated to the W value, which then effects entropy.
- Sun Feb 09, 2020 7:50 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: difference between molar entropies?
- Replies: 6
- Views: 327
Re: difference between molar entropies?
More particles -> higher degeneracy -> more entropy
- Sun Feb 09, 2020 7:49 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Irreversible Expansion
- Replies: 2
- Views: 72
Re: Irreversible Expansion
If the temperature is constant, but you have changing pressure instead, you would use S = nKln(p1/p2), so same equation but replace V2 with P1 and vice versa because they're inversely proportional.
- Sun Feb 09, 2020 7:48 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Gibbs Free Energy
- Replies: 5
- Views: 191
Re: Gibbs Free Energy
When calculating Gibbs free energy, do you use the same method as you would for Hess's law?
- Sun Feb 02, 2020 10:19 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Work done by expansion
- Replies: 8
- Views: 153
Re: Work done by expansion
all we need to know for know is just that delta U = q + w, because we haven't looked at what happens when pressure starts changing
- Sun Feb 02, 2020 10:18 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Hess's Law
- Replies: 2
- Views: 110
Hess's Law
Can someone explain Hess's law and when we would need to use it?
- Sun Feb 02, 2020 10:17 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Extensive/Intensive Property
- Replies: 4
- Views: 69
Re: Extensive/Intensive Property
what is the difference between extensive and intensive properties? just that they are affected by volumes?
- Sun Feb 02, 2020 10:16 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: When to leave out reactants/products from enthalpy calculations
- Replies: 4
- Views: 145
Re: When to leave out reactants/products from enthalpy calculations
Can you assume that inert gasses wouldn't affect enthalpy calculations then?
- Sun Feb 02, 2020 10:16 am
- Forum: Phase Changes & Related Calculations
- Topic: Enthalpy vs Change in Internal Energy
- Replies: 4
- Views: 280
Re: Enthalpy vs Change in Internal Energy
Enthalpy is specifically the energy absorbed/released, so its only going to be equal to internal energy at a constant pressure and volume.
- Sun Jan 26, 2020 9:57 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Aqueos and Gaseous Problems
- Replies: 3
- Views: 491
Re: Aqueos and Gaseous Problems
If there are any aq you have to use concentrations: it's possible to convert from PP to concentration but not vice versa.
- Sun Jan 26, 2020 9:56 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: H2O as a Gas
- Replies: 69
- Views: 6150
Re: H2O as a Gas
you only include gasses and aq things in the chemical equilibrium equation. That being said, water as a gas is included.
- Sun Jan 26, 2020 9:54 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: pH
- Replies: 7
- Views: 244
Re: pH
if you know the pka, you can use the equation PkW = PkA x PkB.
- Sun Jan 26, 2020 9:53 pm
- Forum: Ideal Gases
- Topic: Kc vs Kp
- Replies: 109
- Views: 4382
Re: Kc vs Kp
Kp is for partial pressures of gasses, Kc on the other hand is the equilibrium constants
- Sun Jan 26, 2020 9:53 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: exo thermic
- Replies: 11
- Views: 344
Re: exo thermic
in an exothermic reaction, increasing heat shifts towards reactants. in endothermic reaction, head shifts towards products.
- Wed Jan 15, 2020 1:35 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Thermodynamic Stability
- Replies: 6
- Views: 314
Re: Thermodynamic Stability
Smaller K value -> more thermodynamically stable
- Wed Jan 15, 2020 1:34 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Reaction shifts right or left?
- Replies: 14
- Views: 1496
Re: Reaction shifts right or left?
Left shift means that the reaction is going from right to left, thus forming more reactants. The opposite is true with products. Just look at the written equation and whatever is left or right of the arrow is the direction of movement and what's being formed
- Wed Jan 15, 2020 1:33 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Partial Pressure
- Replies: 19
- Views: 697
Re: Partial Pressure
You most likely should be given the partial pressure to complete a problem where you're either solving for Qp or Kp.
- Wed Jan 15, 2020 1:32 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Reaction Quotient Units
- Replies: 10
- Views: 279
Re: Reaction Quotient Units
The reaction quotient is unitless because the units cancel out.
- Wed Jan 15, 2020 1:31 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Calculating Q
- Replies: 16
- Views: 709
Re: Calculating Q
For calculating either Q or K, every time you online include gasses or aq. Never solids or solvents in the calculations
- Wed Jan 08, 2020 12:23 pm
- Forum: Ideal Gases
- Topic: The Difference between Q and Kc [ENDORSED]
- Replies: 18
- Views: 8572
Re: The Difference between Q and Kc [ENDORSED]
how does Kc take into account the values of partial pressure?
- Wed Jan 08, 2020 12:20 pm
- Forum: Ideal Gases
- Topic: Equilibrium
- Replies: 7
- Views: 204
Re: Equilibrium
Q is the constant of concentration at any point during the reaction, whereas K is the constant of concentration at equilibrium.
- Wed Jan 08, 2020 12:18 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Salt Solution
- Replies: 5
- Views: 650
Re: Salt Solution
would any compound solids and liquids just be considered spectators in the reaction as well?
- Wed Jan 08, 2020 12:14 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Gibs free energy
- Replies: 3
- Views: 111
Re: Gibs free energy
Is the Gibbs free energy constant the same for Q and K? or can you only use it with the K value?
- Wed Jan 08, 2020 12:12 pm
- Forum: Ideal Gases
- Topic: Nitrogen gas
- Replies: 5
- Views: 632
Ideal Gasses
How do you determine which gasses can be considered "ideal"?
- Wed Dec 04, 2019 10:55 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Determining binding sites
- Replies: 3
- Views: 156
Re: Determining binding sites
When determining the coordination number, and/or the number of binding sites, you look at the number of ATOMS with electron pairs, not the number of electron pairs. Hope this helps.
- Wed Dec 04, 2019 10:54 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligands
- Replies: 3
- Views: 222
Re: Ligands
I'd recommend just focusing on memorizing the chart Lavelle emailed, but as you do more practice too you will begin to pick up on the main ligands and their charges.
- Wed Dec 04, 2019 10:53 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination Number
- Replies: 6
- Views: 178
Re: Coordination Number
Pretty much the number of bonds that the coordination compounds has formed is the coordination number.
- Wed Dec 04, 2019 10:52 am
- Forum: Naming
- Topic: Determining Type of Ligand
- Replies: 2
- Views: 76
Determining Type of Ligand
How are you supposed to determine whether a compound is mono, bi, tri, or polydentate? I know you're supposed to look at bonding sites, but does each lone pair of electrons count towards the coordination number?
- Wed Dec 04, 2019 10:50 am
- Forum: Naming
- Topic: Roman numerals
- Replies: 7
- Views: 500
Re: Roman numerals
You determine roman numeral by finding the oxidation number of the metal. You determine the charge on the ligand, and if the coordination compound is an ion, then you can find the oxidation number by determining what number will make all charges true.
Re: oxidation
does the oxidation number come at the end of the entire compound? or just the transition metal
- Mon Dec 02, 2019 8:56 am
- Forum: Calculating the pH of Salt Solutions
- Topic: konstant?
- Replies: 5
- Views: 512
Re: konstant?
When you do equations with the equilibrium constant K though, its important to note that although the equation is products/ reactants, water will be equal to zero.
- Mon Dec 02, 2019 8:55 am
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: pH scale
- Replies: 12
- Views: 605
Re: pH scale
The pH scale definitely can not go negative because it is the factor 10 of H+ ions, so from a mathematical standpoint it would make no sense to have a negative concentration of H+ ions.
- Mon Dec 02, 2019 8:54 am
- Forum: Properties & Structures of Inorganic & Organic Bases
- Topic: Are noble gases considered bases?
- Replies: 9
- Views: 2122
Re: Are noble gases considered bases?
Technically no because it's so rare that noble gasses even engage with anything that they're considered inactive. The definition of a base is that it receives electrons.
- Mon Dec 02, 2019 8:53 am
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Weak acids & pH
- Replies: 4
- Views: 201
Re: Weak acids & pH
In some solvents, the acid, although weak, will dissociate more.
- Tue Nov 26, 2019 9:29 am
- Forum: *Crystal Field Theory
- Topic: Electric Field
- Replies: 6
- Views: 2479
Re: Electric Field
Anions create a static field that help to break down electron orbitals, mainly d and f by the crystal field theory
- Tue Nov 26, 2019 9:27 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Naming
- Replies: 3
- Views: 255
Re: Naming
are the metals always named last then even if they're names are later in the alphabet?
- Tue Nov 26, 2019 9:26 am
- Forum: Industrial Examples
- Topic: Favorite Industrial Example
- Replies: 3
- Views: 1106
Re: Favorite Industrial Example
A coordination compound is a metallic central atom surrounded by other atoms or molecules that are known as ligands or complexing agents.
- Tue Nov 26, 2019 9:25 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: coordination number
- Replies: 3
- Views: 135
Re: coordination number
if you have a coordination site and a bond inside on of those compounds, does that mean that the coordination number would be four then?
- Tue Nov 26, 2019 9:23 am
- Forum: Naming
- Topic: -ate ending
- Replies: 8
- Views: 564
Re: -ate ending
if you only use ate for a negative charge, what do you use for positive and neutral charges?
- Sun Nov 17, 2019 10:48 pm
- Forum: Bond Lengths & Energies
- Topic: Strongest Bonds
- Replies: 11
- Views: 872
Re: Strongest Bonds
The strongest is dipole dipole followed by ion-dipole.
- Sun Nov 17, 2019 10:47 pm
- Forum: Lewis Structures
- Topic: Oxygen
- Replies: 9
- Views: 737
Re: Oxygen
Oxygen can have single, double, or triple bonds depending on the molecule and corresponding Lewis structure.
- Sun Nov 17, 2019 10:47 pm
- Forum: Electronegativity
- Topic: Noble Gases
- Replies: 40
- Views: 12535
Re: Noble Gases
Neon gas yes, is part of the normal electronegativity trends. Noble gasses, on the other hand, don't follow the pattern because they all already have filled valence shells.
- Sun Nov 17, 2019 10:46 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizable vs polarizing power
- Replies: 6
- Views: 439
Re: Polarizable vs polarizing power
Does distortion in regards to polarizability necessarily mean the ability to form octets? or just the ability to attract electrons from another atom's electron cloud
- Sun Nov 17, 2019 10:44 pm
- Forum: Sigma & Pi Bonds
- Topic: Test 2 Sigma and Pi bonds
- Replies: 5
- Views: 179
Re: Test 2 Sigma and Pi bonds
What is the relevance of having a sigma vs. a pi bond? is there an effect on bond strength and energy?
- Tue Nov 12, 2019 9:28 am
- Forum: Bond Lengths & Energies
- Topic: Shorter bond lengths
- Replies: 12
- Views: 653
Re: Shorter bond lengths
We know that double bonds are shorter ands stronger than single bonds, and that triple bonds are even more so than double. But how do the length and strengths of these bonds effect the different energies?
- Tue Nov 12, 2019 9:27 am
- Forum: Ionic & Covalent Bonds
- Topic: Resonance (all bonds are a hybrid of different bonds)
- Replies: 10
- Views: 351
Re: Resonance (all bonds are a hybrid of different bonds)
Is it possible to have a resonance structure where the bond that changes with each different possible structure is a triple bond instead of a double bond??
- Tue Nov 12, 2019 9:26 am
- Forum: Biological Examples
- Topic: Ligands
- Replies: 6
- Views: 960
Re: Ligands
Do the functions of these particular ligands effect the structures of the molecules? Or just the composition?
- Tue Nov 12, 2019 9:22 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Magnetic Quantum numbers
- Replies: 4
- Views: 698
Re: Magnetic Quantum numbers
Magnetic quantum numbers can range from -l to l, and there are either going to be 1, 3, 5, 7 depending on the value of l
- Tue Nov 12, 2019 9:17 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR Model
- Replies: 3
- Views: 106
Re: VSEPR Model
Are there specific molecules that we need to memorize the VSEPR models for then or will they be given?
- Sun Nov 03, 2019 9:49 am
- Forum: Octet Exceptions
- Topic: Expanded Octets and Formal Charge
- Replies: 3
- Views: 95
Re: Expanded Octets and Formal Charge
Are there only particular atoms/molecules that allow for expanded octets? Also is there a way to explain why this is possible for some and not all?
- Sun Nov 03, 2019 9:47 am
- Forum: Electronegativity
- Topic: Electronegativity
- Replies: 9
- Views: 357
Re: Electronegativity
What is the pattern on the periodic table that we're supposed to memorize for determining electronegativity?
- Sun Nov 03, 2019 9:46 am
- Forum: Dipole Moments
- Topic: Dipole Moments
- Replies: 3
- Views: 84
Re: Dipole Moments
That being said, you can look for patterns because the further two elements are from each other on the periodic table they'll have greater dipole moments.
- Sun Nov 03, 2019 9:45 am
- Forum: Quantum Numbers and The H-Atom
- Topic: The plus and minus sign on the magnetic quantum #
- Replies: 5
- Views: 182
Re: The plus and minus sign on the magnetic quantum #
Because the values are only going to be +1/2 or -1/2, I feel like just doing a + or - will be sufficient to distinguish.
- Sun Nov 03, 2019 9:44 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Wavelength Plausibility
- Replies: 31
- Views: 2574
Re: Wavelength Plausibility
Technically, if the question asks if the wavelength is detectable, or more often it will ask if there are "detectable wavelike properties" that means that it wants to know whether the wavelength is greater than 10e-15 or not.
- Thu Oct 24, 2019 9:29 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configurations
- Replies: 13
- Views: 2926
Re: Electron Configurations
It's important that you memorize the different groups while looking at the periodic table. The lefthand side has the s groups, the middle the d groups, and the right side the p groups. Then, the constant that determines which orbital it is corresponds to the period # (for s and p groups) and period ...
- Thu Oct 24, 2019 9:27 am
- Forum: Trends in The Periodic Table
- Topic: Ionization Energy [ENDORSED]
- Replies: 3
- Views: 160
Re: Ionization Energy [ENDORSED]
As you move down the period, it would decrease because the repulsion amongst the electron cloud decreases, which lowers the ionization energy.
- Thu Oct 24, 2019 9:25 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Uncertainty value in equation
- Replies: 9
- Views: 341
Re: Uncertainty value in equation
Do uncertainty values always have to be whole integers? also when giving the "total uncertainty" do you always know to just add the numbers or will it ever specify for the range?
- Thu Oct 24, 2019 9:24 am
- Forum: Properties of Electrons
- Topic: d-orbital in the electron configuration
- Replies: 3
- Views: 196
Re: d-orbital in the electron configuration
As seen through the Aufbau Principle, it's imperative to fill the 3d energy level before you can fill the 4d.
- Thu Oct 24, 2019 9:23 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Orbitals
- Replies: 5
- Views: 264
Re: Orbitals
Yes, there are always going to be n-1 possible values. But 0 is included in those, so it would only go from 0-5!
- Thu Oct 24, 2019 9:23 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Orbitals
- Replies: 5
- Views: 264
Re: Orbitals
Yes, there are always going to be n-1 possible values. But 0 is included in those, so it would only go from 0-5!
- Thu Oct 17, 2019 9:24 am
- Forum: DeBroglie Equation
- Topic: De Broglie Wavelength
- Replies: 7
- Views: 291
Re: De Broglie Wavelength
I think it just means to use the De Broglie equation because the De Broglie equation is derived from the equations E=pc, c= wavelength*frequency, and E=hv which we have learned before. However, this equation only works for any particle with a rest mass, momentum, and wavelength so if it asks for th...
- Thu Oct 17, 2019 9:23 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Atomic Radius
- Replies: 4
- Views: 169
Re: Atomic Radius
Are there specific values somewhere on the periodic table that can be used to determine atomic radius or do you just have to determine comparatively by location?
- Thu Oct 17, 2019 9:22 am
- Forum: Photoelectric Effect
- Topic: Question about Energy Threshold
- Replies: 7
- Views: 206
Re: Question about Energy Threshold
If the energy isn't enough to pass the threshold, the photon won't be able to remove electrons. The energy of the photon needs to be greater than the energy of the electron to remove it.
- Thu Oct 17, 2019 9:20 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Determining Orbitals Based on Periodic Table
- Replies: 2
- Views: 104
Determining Orbitals Based on Periodic Table
In class, Dr. Lavelle mentioned that we only really need to be concerned with three of the types of orbitals. Those that correspond with the left of the periodic table, the first row through the middle, and the righthand columns respectively. Is this the case? Also how do we determine which orbitals...
- Thu Oct 17, 2019 9:18 am
- Forum: *Black Body Radiation
- Topic: black body
- Replies: 2
- Views: 300
Re: black body
The extent to which black bodies were discussed in the textbook was pretty much a general definition. So likely we just have to know that its a concept in quantum mechanics that there's a substance of some sort that absorbs all types of radiation and waves of light.
- Fri Oct 11, 2019 9:09 am
- Forum: Properties of Electrons
- Topic: wave/particle properties of mass
- Replies: 3
- Views: 113
Re: wave/particle properties of mass
Technically, the movement of any matter (such as the water in a bucket example someone mentioned above), is wave movement. BUT, if you break anything down to an atomic level, wouldn't it have particle movement instead? But then, does all matter definitely have wave movement instead or is that imposs...
- Fri Oct 11, 2019 9:06 am
- Forum: Properties of Electrons
- Topic: Energy Levels
- Replies: 8
- Views: 201
Re: Energy Levels
When looking at energy levels, is there a direct correspondence of 1 photon -> 1 energy level? wouldn't it depend on the intensity of a photon, or is the intensity the same for all photons, and thus a constant relationship between photons and energy level?
- Fri Oct 11, 2019 9:05 am
- Forum: Trends in The Periodic Table
- Topic: Atomic Radius
- Replies: 16
- Views: 882
Re: Atomic Radius
how does the radius of atoms change as electrons become excited/energy levels shift? is there a linear increase/decrease in radius?
- Fri Oct 11, 2019 9:04 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg equation [ENDORSED]
- Replies: 73
- Views: 8680
Re: Rydberg equation [ENDORSED]
When is an example of when you would use the Rydberg equation?
- Fri Oct 11, 2019 9:02 am
- Forum: Properties of Light
- Topic: Clarification on Frequency
- Replies: 8
- Views: 411
Do photons change with wavelength?
I'm trying to visualize some of what we went over in lecture about how shorter, less intense wavelengths have enough energy in a single photon to displace elections. I was wondering what about photons changed with wavelength (is it intensity?), and if there's an equation that relates them?
- Thu Oct 03, 2019 2:18 pm
- Forum: Significant Figures
- Topic: Sig Figs
- Replies: 4
- Views: 120
Re: Sig Figs
If it's a problem that requires you to use molar masses, it would make sense that you definitely take them into account. For example, if in a word problem you're given masses to the ten thousandths place, and you find molar masses only to the thousandths place, you would need to round the given mass...
- Thu Oct 03, 2019 2:15 pm
- Forum: Limiting Reactant Calculations
- Topic: Basic Question
- Replies: 11
- Views: 522
Re: Basic Question
Technically, it's impossible to have two limiting reactants, because that would mean that both of the reagents would be being used in full. And the definition of a limiting reactant is the one left over in excess. Thus, you could really only have one or zero limiting reactants because you can have a...
- Thu Oct 03, 2019 2:13 pm
- Forum: Significant Figures
- Topic: Sig Fig Rules
- Replies: 3
- Views: 184
Sig Fig Rules
It has been a few years since I've been in chemistry, and I was hoping to clarify some of the basic sig fig rules. Is it customary to round to the hundredths or the thousands place when presenting a mass value (g) as your answer? Also, do the rules for this vary greatly based off of what type of pro...
- Thu Oct 03, 2019 2:10 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Avogadro's Number?
- Replies: 16
- Views: 900
Re: Avogadro's Number?
It's important to know Avogadro's number because it's equivalent to the number of atoms in a single carbon 12, and normalized as a way to measure a single mole. Whenever we need Avogadro's number, I think it will be given to us, but most regularly you'll need to use it in order to convert from moles...