Search found 101 matches

by Caroline Zepecki
Tue Mar 10, 2020 11:59 am
Forum: *Enzyme Kinetics
Topic: Catalysts
Replies: 8
Views: 448

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.
by Caroline Zepecki
Tue Mar 10, 2020 11:58 am
Forum: Experimental Details
Topic: determining order of reaction
Replies: 6
Views: 119

Re: determining order of reaction

We should either be given the graph to figure it out or given the information for an experiment.
by Caroline Zepecki
Tue Mar 10, 2020 11:58 am
Forum: Environment, Ozone, CFCs
Topic: stoichiometric coefficients
Replies: 9
Views: 94

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.
by Caroline Zepecki
Tue Mar 10, 2020 11:57 am
Forum: Zero Order Reactions
Topic: Zero Order
Replies: 8
Views: 56

Re: Zero Order

Zero order reactions depend only on K, because [A]^0 =1, so it doesn't effect the rate.
by Caroline Zepecki
Tue Mar 10, 2020 11:55 am
Forum: Second Order Reactions
Topic: [A] v. Time
Replies: 16
Views: 172

Re: [A] v. Time

For a second order reaction, it would be linear.
by Caroline Zepecki
Sun Mar 08, 2020 10:34 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Diamond
Replies: 6
Views: 108

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
by Caroline Zepecki
Sun Mar 08, 2020 10:33 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: thermodynamically stable
Replies: 6
Views: 80

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
by Caroline Zepecki
Sun Mar 08, 2020 10:32 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: derivations
Replies: 9
Views: 137

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.
by Caroline Zepecki
Sun Mar 08, 2020 10:31 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: kinetically stable?
Replies: 10
Views: 124

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.
by Caroline Zepecki
Sun Mar 08, 2020 10:30 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: instantaneous rate
Replies: 16
Views: 145

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.
by Caroline Zepecki
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: 41

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
by Caroline Zepecki
Sun Mar 01, 2020 3:59 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: C(gr) state
Replies: 4
Views: 40

Re: C(gr) state

Means graphite form of carbon, helpful to know that this is one of the more stable forms
by Caroline Zepecki
Sun Mar 01, 2020 3:58 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagram (phases)
Replies: 2
Views: 41

Re: Cell Diagram (phases)

Electrode | Solid | liquid, liquid | aq |(salt bridge)| aq |liquid | solid | electrode
by Caroline Zepecki
Sun Mar 01, 2020 3:57 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Salt Bridge
Replies: 10
Views: 61

Re: Salt Bridge

Salt bridge allows for ion transfer when anode and cathode are completely isolated from each other
by Caroline Zepecki
Sun Mar 01, 2020 3:56 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: precipitation reactions
Replies: 3
Views: 40

Re: precipitation reactions

if there are no solids in the reactants, but are in the products, can consider a precipitation reaction.
by Caroline Zepecki
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: 74

Re: F

It is the charge of 6.02 x 10^23 electrons
by Caroline Zepecki
Sun Feb 23, 2020 7:25 pm
Forum: Balancing Redox Reactions
Topic: Oxidation Numbers- How to Find
Replies: 3
Views: 36

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
by Caroline Zepecki
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: 125

Re: rust

The elections gained by iron in the process, or the reduction, is the forming of the rust in the reaction
by Caroline Zepecki
Sun Feb 23, 2020 7:24 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: voltage
Replies: 8
Views: 57

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
by Caroline Zepecki
Sun Feb 23, 2020 7:22 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Half reactions
Replies: 13
Views: 126

Re: Half reactions

The half reactions are the individual Reduction and Oxidation reactions of a Redox reaction
by Caroline Zepecki
Mon Feb 17, 2020 7:10 pm
Forum: Environment, Fossil Fuels, Alternative Fuels
Topic: Energy Density
Replies: 7
Views: 3727

Re: Energy Density

How would you go about calculating energy density?
by Caroline Zepecki
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: 141

Re: Boltzman's Entropy Equation

Microstates refers to the possible arrangements, so for example, when calculating W, it would be micro states ^ # of atoms
by Caroline Zepecki
Mon Feb 17, 2020 7:08 pm
Forum: Calculating Work of Expansion
Topic: Reversible vs Irreversible
Replies: 13
Views: 240

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
by Caroline Zepecki
Mon Feb 17, 2020 7:07 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: When to use the different equations
Replies: 5
Views: 75

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.
by Caroline Zepecki
Mon Feb 17, 2020 7:06 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated vs Closed [ENDORSED]
Replies: 34
Views: 717

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
by Caroline Zepecki
Sun Feb 09, 2020 7:51 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: First Law of Thermodynamics Definition
Replies: 4
Views: 57

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.
by Caroline Zepecki
Sun Feb 09, 2020 7:50 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy Question
Replies: 3
Views: 43

Re: Entropy Question

yes, because the number of different positions are directly correlated to the W value, which then effects entropy.
by Caroline Zepecki
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: 44

Re: difference between molar entropies?

More particles -> higher degeneracy -> more entropy
by Caroline Zepecki
Sun Feb 09, 2020 7:49 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Irreversible Expansion
Replies: 2
Views: 34

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.
by Caroline Zepecki
Sun Feb 09, 2020 7:48 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy
Replies: 5
Views: 60

Re: Gibbs Free Energy

When calculating Gibbs free energy, do you use the same method as you would for Hess's law?
by Caroline Zepecki
Sun Feb 02, 2020 10:19 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Work done by expansion
Replies: 8
Views: 61

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
by Caroline Zepecki
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: 31

Hess's Law

Can someone explain Hess's law and when we would need to use it?
by Caroline Zepecki
Sun Feb 02, 2020 10:17 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Extensive/Intensive Property
Replies: 4
Views: 37

Re: Extensive/Intensive Property

what is the difference between extensive and intensive properties? just that they are affected by volumes?
by Caroline Zepecki
Sun Feb 02, 2020 10:16 am
Forum: Phase Changes & Related Calculations
Topic: Enthalpy vs Change in Internal Energy
Replies: 4
Views: 44

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.
by Caroline Zepecki
Sun Jan 26, 2020 9:57 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Aqueos and Gaseous Problems
Replies: 3
Views: 295

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.
by Caroline Zepecki
Sun Jan 26, 2020 9:56 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: H2O as a Gas
Replies: 12
Views: 181

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.
by Caroline Zepecki
Sun Jan 26, 2020 9:54 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: pH
Replies: 7
Views: 85

Re: pH

if you know the pka, you can use the equation PkW = PkA x PkB.
by Caroline Zepecki
Sun Jan 26, 2020 9:53 pm
Forum: Ideal Gases
Topic: Kc vs Kp
Replies: 43
Views: 508

Re: Kc vs Kp

Kp is for partial pressures of gasses, Kc on the other hand is the equilibrium constants
by Caroline Zepecki
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: 154

Re: exo thermic

in an exothermic reaction, increasing heat shifts towards reactants. in endothermic reaction, head shifts towards products.
by Caroline Zepecki
Wed Jan 15, 2020 1:35 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Thermodynamic Stability
Replies: 6
Views: 64

Re: Thermodynamic Stability

Smaller K value -> more thermodynamically stable
by Caroline Zepecki
Wed Jan 15, 2020 1:34 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Reaction shifts right or left?
Replies: 14
Views: 211

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
by Caroline Zepecki
Wed Jan 15, 2020 1:33 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Partial Pressure
Replies: 19
Views: 131

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.
by Caroline Zepecki
Wed Jan 15, 2020 1:32 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Reaction Quotient Units
Replies: 10
Views: 60

Re: Reaction Quotient Units

The reaction quotient is unitless because the units cancel out.
by Caroline Zepecki
Wed Jan 15, 2020 1:31 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Calculating Q
Replies: 16
Views: 160

Re: Calculating Q

For calculating either Q or K, every time you online include gasses or aq. Never solids or solvents in the calculations
by Caroline Zepecki
Wed Jan 08, 2020 12:23 pm
Forum: Ideal Gases
Topic: The Difference between Q and Kc [ENDORSED]
Replies: 18
Views: 1757

Re: The Difference between Q and Kc [ENDORSED]

how does Kc take into account the values of partial pressure?
by Caroline Zepecki
Wed Jan 08, 2020 12:20 pm
Forum: Ideal Gases
Topic: Equilibrium
Replies: 7
Views: 74

Re: Equilibrium

Q is the constant of concentration at any point during the reaction, whereas K is the constant of concentration at equilibrium.
by Caroline Zepecki
Wed Jan 08, 2020 12:18 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Salt Solution
Replies: 5
Views: 365

Re: Salt Solution

would any compound solids and liquids just be considered spectators in the reaction as well?
by Caroline Zepecki
Wed Jan 08, 2020 12:14 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Gibs free energy
Replies: 3
Views: 37

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?
by Caroline Zepecki
Wed Jan 08, 2020 12:12 pm
Forum: Ideal Gases
Topic: Nitrogen gas
Replies: 5
Views: 343

Ideal Gasses

How do you determine which gasses can be considered "ideal"?
by Caroline Zepecki
Wed Dec 04, 2019 10:55 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Determining binding sites
Replies: 3
Views: 41

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.
by Caroline Zepecki
Wed Dec 04, 2019 10:54 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands
Replies: 3
Views: 48

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.
by Caroline Zepecki
Wed Dec 04, 2019 10:53 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Number
Replies: 6
Views: 78

Re: Coordination Number

Pretty much the number of bonds that the coordination compounds has formed is the coordination number.
by Caroline Zepecki
Wed Dec 04, 2019 10:52 am
Forum: Naming
Topic: Determining Type of Ligand
Replies: 2
Views: 34

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?
by Caroline Zepecki
Wed Dec 04, 2019 10:50 am
Forum: Naming
Topic: Roman numerals
Replies: 7
Views: 145

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.
by Caroline Zepecki
Mon Dec 02, 2019 8:58 am
Forum: Naming
Topic: oxidation
Replies: 8
Views: 95

Re: oxidation

does the oxidation number come at the end of the entire compound? or just the transition metal
by Caroline Zepecki
Mon Dec 02, 2019 8:56 am
Forum: Calculating the pH of Salt Solutions
Topic: konstant?
Replies: 5
Views: 266

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.
by Caroline Zepecki
Mon Dec 02, 2019 8:55 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH scale
Replies: 12
Views: 111

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.
by Caroline Zepecki
Mon Dec 02, 2019 8:54 am
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Are noble gases considered bases?
Replies: 8
Views: 1068

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.
by Caroline Zepecki
Mon Dec 02, 2019 8:53 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Weak acids & pH
Replies: 4
Views: 86

Re: Weak acids & pH

In some solvents, the acid, although weak, will dissociate more.
by Caroline Zepecki
Tue Nov 26, 2019 9:29 am
Forum: *Crystal Field Theory
Topic: Electric Field
Replies: 5
Views: 1520

Re: Electric Field

Anions create a static field that help to break down electron orbitals, mainly d and f by the crystal field theory
by Caroline Zepecki
Tue Nov 26, 2019 9:27 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Naming
Replies: 3
Views: 51

Re: Naming

are the metals always named last then even if they're names are later in the alphabet?
by Caroline Zepecki
Tue Nov 26, 2019 9:26 am
Forum: Industrial Examples
Topic: Favorite Industrial Example
Replies: 3
Views: 485

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.
by Caroline Zepecki
Tue Nov 26, 2019 9:25 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: coordination number
Replies: 3
Views: 51

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?
by Caroline Zepecki
Tue Nov 26, 2019 9:23 am
Forum: Naming
Topic: -ate ending
Replies: 8
Views: 97

Re: -ate ending

if you only use ate for a negative charge, what do you use for positive and neutral charges?
by Caroline Zepecki
Sun Nov 17, 2019 10:48 pm
Forum: Bond Lengths & Energies
Topic: Strongest Bonds
Replies: 11
Views: 306

Re: Strongest Bonds

The strongest is dipole dipole followed by ion-dipole.
by Caroline Zepecki
Sun Nov 17, 2019 10:47 pm
Forum: Lewis Structures
Topic: Oxygen
Replies: 9
Views: 268

Re: Oxygen

Oxygen can have single, double, or triple bonds depending on the molecule and corresponding Lewis structure.
by Caroline Zepecki
Sun Nov 17, 2019 10:47 pm
Forum: Electronegativity
Topic: Noble Gases
Replies: 20
Views: 1029

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.
by Caroline Zepecki
Sun Nov 17, 2019 10:46 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizable vs polarizing power
Replies: 5
Views: 179

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
by Caroline Zepecki
Sun Nov 17, 2019 10:44 pm
Forum: Sigma & Pi Bonds
Topic: Test 2 Sigma and Pi bonds
Replies: 5
Views: 64

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?
by Caroline Zepecki
Tue Nov 12, 2019 9:28 am
Forum: Bond Lengths & Energies
Topic: Shorter bond lengths
Replies: 12
Views: 113

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?
by Caroline Zepecki
Tue Nov 12, 2019 9:27 am
Forum: Ionic & Covalent Bonds
Topic: Resonance (all bonds are a hybrid of different bonds)
Replies: 10
Views: 145

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??
by Caroline Zepecki
Tue Nov 12, 2019 9:26 am
Forum: Biological Examples
Topic: Ligands
Replies: 6
Views: 461

Re: Ligands

Do the functions of these particular ligands effect the structures of the molecules? Or just the composition?
by Caroline Zepecki
Tue Nov 12, 2019 9:22 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Magnetic Quantum numbers
Replies: 4
Views: 157

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
by Caroline Zepecki
Tue Nov 12, 2019 9:17 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Model
Replies: 3
Views: 32

Re: VSEPR Model

Are there specific molecules that we need to memorize the VSEPR models for then or will they be given?
by Caroline Zepecki
Sun Nov 03, 2019 9:49 am
Forum: Octet Exceptions
Topic: Expanded Octets and Formal Charge
Replies: 3
Views: 51

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?
by Caroline Zepecki
Sun Nov 03, 2019 9:47 am
Forum: Electronegativity
Topic: Electronegativity
Replies: 9
Views: 98

Re: Electronegativity

What is the pattern on the periodic table that we're supposed to memorize for determining electronegativity?
by Caroline Zepecki
Sun Nov 03, 2019 9:46 am
Forum: Dipole Moments
Topic: Dipole Moments
Replies: 3
Views: 47

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.
by Caroline Zepecki
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: 67

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.
by Caroline Zepecki
Sun Nov 03, 2019 9:44 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Wavelength Plausibility
Replies: 31
Views: 1439

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.
by Caroline Zepecki
Thu Oct 24, 2019 9:29 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configurations
Replies: 13
Views: 447

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 ...
by Caroline Zepecki
Thu Oct 24, 2019 9:27 am
Forum: Trends in The Periodic Table
Topic: Ionization Energy [ENDORSED]
Replies: 3
Views: 73

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.
by Caroline Zepecki
Thu Oct 24, 2019 9:25 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty value in equation
Replies: 9
Views: 110

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?
by Caroline Zepecki
Thu Oct 24, 2019 9:24 am
Forum: Properties of Electrons
Topic: d-orbital in the electron configuration
Replies: 3
Views: 63

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.
by Caroline Zepecki
Thu Oct 24, 2019 9:23 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals
Replies: 5
Views: 73

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!
by Caroline Zepecki
Thu Oct 24, 2019 9:23 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals
Replies: 5
Views: 73

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!
by Caroline Zepecki
Thu Oct 17, 2019 9:24 am
Forum: DeBroglie Equation
Topic: De Broglie Wavelength
Replies: 7
Views: 114

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...
by Caroline Zepecki
Thu Oct 17, 2019 9:23 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Radius
Replies: 4
Views: 81

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?
by Caroline Zepecki
Thu Oct 17, 2019 9:22 am
Forum: Photoelectric Effect
Topic: Question about Energy Threshold
Replies: 7
Views: 87

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.
by Caroline Zepecki
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: 45

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...
by Caroline Zepecki
Thu Oct 17, 2019 9:18 am
Forum: *Black Body Radiation
Topic: black body
Replies: 2
Views: 134

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.
by Caroline Zepecki
Fri Oct 11, 2019 9:09 am
Forum: Properties of Electrons
Topic: wave/particle properties of mass
Replies: 3
Views: 54

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...
by Caroline Zepecki
Fri Oct 11, 2019 9:06 am
Forum: Properties of Electrons
Topic: Energy Levels
Replies: 8
Views: 70

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?
by Caroline Zepecki
Fri Oct 11, 2019 9:05 am
Forum: Trends in The Periodic Table
Topic: Atomic Radius
Replies: 16
Views: 271

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?
by Caroline Zepecki
Fri Oct 11, 2019 9:04 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg equation [ENDORSED]
Replies: 73
Views: 3686

Re: Rydberg equation [ENDORSED]

When is an example of when you would use the Rydberg equation?
by Caroline Zepecki
Fri Oct 11, 2019 9:02 am
Forum: Properties of Light
Topic: Clarification on Frequency
Replies: 8
Views: 153

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?
by Caroline Zepecki
Thu Oct 03, 2019 2:18 pm
Forum: Significant Figures
Topic: Sig Figs
Replies: 4
Views: 74

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...
by Caroline Zepecki
Thu Oct 03, 2019 2:15 pm
Forum: Limiting Reactant Calculations
Topic: Basic Question
Replies: 11
Views: 167

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...
by Caroline Zepecki
Thu Oct 03, 2019 2:13 pm
Forum: Significant Figures
Topic: Sig Fig Rules
Replies: 3
Views: 93

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...
by Caroline Zepecki
Thu Oct 03, 2019 2:10 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Avogadro's Number?
Replies: 16
Views: 367

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...

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