Classical vs Quantum
Moderators: Chem_Mod, Chem_Admin
- Jason_Glass_2L
- Posts: 101
- Joined: Wed Sep 30, 2020 9:43 pm
Classical vs Quantum
Postby Jason_Glass_2L » Mon Oct 12, 2020 2:10 pm
Quick question, classical mechanics pertains to things you would learn in physics while quantum pertains more to chemistry right? I know there is a strong overlap between both chemistry and physics so it won't be definitive, but is this generally true?
Top
- Tikva Cohen 1K
- Posts: 103
- Joined: Wed Sep 30, 2020 9:39 pm
- Beenupvoted: 1 time
Re: Classical vs Quantum
Postby Tikva Cohen 1K » Mon Oct 12, 2020 3:03 pm
I believe the main difference is that classical mechanics describes larger items or objects we can physically see and hold why quantum pertains to microscopic objects where our eyes can't actually see them. So if that's the case then you're most likely right because chemistry usually deals with microscopic objects and physics is macroscopic.
Top
- Emily Ding 1J
- Posts: 112
- Joined: Wed Sep 30, 2020 9:36 pm
- Beenupvoted: 3 times
Re: Classical vs Quantum
Postby Emily Ding 1J » Mon Oct 12, 2020 3:17 pm
Another important difference is that classical mechanics usually deals with continuous functions and equations whereas most variables are quantized and discrete in quantum mechanics.
Top
- sophie esherick 3H
- Posts: 124
- Joined: Wed Sep 30, 2020 9:35 pm
- Beenupvoted: 6 times
Re: Classical vs Quantum
Postby sophie esherick 3H » Mon Oct 12, 2020 3:21 pm
Classical mechanics was what you use for larger objects and it was used in physics before the theory of relativity and quantum mechanics, so it describes many aspects of nature at a macroscopic scale. Quantum mechanics describe things at subatomic scale or microscopic scale. You usually use quantum in chemistry just because we work with objects that are at subatomic scale with things such as electrons, protons and neutrons versus everyday objects like cars. Physics normally deals with things on macroscopic scales. Also, quantum mechanics are used over classical mechanics in chemistry since values for energy, momentum, angular momentum are restricted to discrete values (quantized values).
Top
- Samuel Flores 1E
- Posts: 100
- Joined: Wed Sep 30, 2020 9:51 pm
Re: Classical vs Quantum
Postby Samuel Flores 1E » Mon Oct 12, 2020 3:26 pm
I agree with the responses above. When chemistry is dealing with subjects on the atomic scale, often we would be dealing with quantum mechanics. This is because we are looking at discrete units that cannot be broken down further. As quantum mechanics is often dealing with subjects on a microscopic scale, the atomic scale is often thought of in terms of QM.
Hope this helps!
Top
- Kimiya Aframian IB
- Posts: 131
- Joined: Wed Sep 30, 2020 9:34 pm
Re: Classical vs Quantum
Postby Kimiya Aframian IB » Mon Oct 12, 2020 4:07 pm
Jason_Glass_3H wrote:Quick question, classical mechanics pertains to things you would learn in physics while quantum pertains more to chemistry right? I know there is a strong overlap between both chemistry and physics so it won't be definitive, but is this generally true?
Hi! I think the difference is that classical is the more general understanding and bigger picture while quantum is a more refined and zoomed in understanding of a model. So for in the example from lecture on 10/12/20, he said pouring water with the classical version would be continuous, but if we look on a closer level we see that the individual water molecules are being transferred. Hope this helps!
Top
- Kimiya Aframian IB
- Posts: 131
- Joined: Wed Sep 30, 2020 9:34 pm
Re: Classical vs Quantum
Postby Kimiya Aframian IB » Mon Oct 12, 2020 4:07 pm
Jason_Glass_3H wrote:Quick question, classical mechanics pertains to things you would learn in physics while quantum pertains more to chemistry right? I know there is a strong overlap between both chemistry and physics so it won't be definitive, but is this generally true?
Hi! I think the difference is that classical is the more general understanding and bigger picture while quantum is a more refined and zoomed in understanding of a model. So for in the example from lecture on 10/12/20, he said pouring water with the classical version would be continuous, but if we look on a closer level we see that the individual water molecules are being transferred. Hope this helps!
Top
Return to “General Science Questions”
Jump to
- NEWS
- NEWS & RESOURCES
- About The Forum
- Forum Rules and Helpful Hints
- How to make a New Post (submit a question) and use Equation Editor (click for details)
- Email Notification (click for details)
- How to Subscribe to a Forum, Subscribe to a Topic, and Bookmark a Topic (click for details)
- Endorsed Post (click for details)
- Multimedia Attachments (click for details)
- Strikethrough (click for details)
- Chem 14A
- Review of Chemical & Physical Principles
- SI Units, Unit Conversions
- Significant Figures
- Accuracy, Precision, Mole, Other Definitions
- Molarity, Solutions, Dilutions
- Empirical & Molecular Formulas
- Balancing Chemical Reactions
- Limiting Reactant Calculations
- The Quantum World
- Properties of Light
- Properties of Electrons
- Einstein Equation
- *Black Body Radiation
- Photoelectric Effect
- Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- DeBroglie Equation
- Heisenberg Indeterminacy (Uncertainty) Equation
- *Shrodinger Equation
- *Particle in a Box
- Wave Functions and s-, p-, d-, f- Orbitals
- Quantum Numbers and The H-Atom
- Electron Configurations for Multi-Electron Atoms
- Trends in The Periodic Table
- Chemical Bonds
- Ionic & Covalent Bonds
- Sigma & Pi Bonds
- Lewis Structures
- Resonance Structures
- Formal Charge and Oxidation Numbers
- Octet Exceptions
- Coordinate Covalent Bonds
- Polarisability of Anions, The Polarizing Power of Cations
- Electronegativity
- Dipole Moments
- Bond Lengths & Energies
- Forces and Liquid Structure
- Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
- Molecular Shape and Structure
- Determining Molecular Shape (VSEPR)
- Hybridization
- *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Coordination Compounds and their Biological Importance
- Naming
- Shape, Structure, Coordination Number, Ligands
- Biological Examples
- Industrial Examples
- *Stereochemistry
- *Crystal Field Theory
- *Molecular Orbital Theory Applied To Transition Metals
- Acids and Bases
- Properties & Structures of Inorganic & Organic Acids
- Properties & Structures of Inorganic & Organic Bases
- Amphoteric Compounds
- Lewis Acids & Bases
- Bronsted Acids & Bases
- Conjugate Acids & Bases
- Acidity & Basicity Constants and The Conjugate Seesaw
- Calculating pH or pOH for Strong & Weak Acids & Bases
- Polyprotic Acids & Bases
- Identifying Acidic & Basic Salts
- Calculating the pH of Salt Solutions
- Air Pollution & Acid Rain
- Chem 14A Uploaded Files (Worksheets, etc.)
- Student Social/Study Group
- Administrative Questions and Class Announcements
- General Science Questions
- *Aqueous Equilibria
- *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
- *Biological Importance of Buffer Solutions
- *Titrations & Titration Calculations
- *Indicators
- Chem 14B
- Chemical Equilibrium
- Ideal Gases
- Equilibrium Constants & Calculating Concentrations
- Non-Equilibrium Conditions & The Reaction Quotient
- Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Thermochemistry
- Phase Changes & Related Calculations
- Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Heat Capacities, Calorimeters & Calorimetry Calculations
- Thermodynamics
- Thermodynamic Systems (Open, Closed, Isolated)
- Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Calculating Work of Expansion
- Concepts & Calculations Using First Law of Thermodynamics
- Concepts & Calculations Using Second Law of Thermodynamics
- Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Entropy Changes Due to Changes in Volume and Temperature
- Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Gibbs Free Energy Concepts and Calculations
- Van't Hoff Equation
- Environment, Fossil Fuels, Alternative Fuels
- Biological Examples (*DNA Structural Transitions, etc.)
- Electrochemistry
- Balancing Redox Reactions
- Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Work, Gibbs Free Energy, Cell (Redox) Potentials
- Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
- Chemical Kinetics
- Kinetics vs. Thermodynamics Controlling a Reaction
- General Rate Laws
- Method of Initial Rates (To Determine n and k)
- Zero Order Reactions
- First Order Reactions
- Second Order Reactions
- Reaction Mechanisms, Reaction Profiles
- Arrhenius Equation, Activation Energies, Catalysts
- *Enzyme Kinetics
- Experimental Details
- Environment, Ozone, CFCs
- Biological Examples
- Chem 14B Uploaded Files (Worksheets, etc.)
- Student Social/Study Group
- Administrative Questions and Class Announcements
- General Science Questions
- *Thermodynamics and Kinetics of Organic Reactions
- *Electrophiles
- *Nucleophiles
- *Organic Reaction Mechanisms in General
- *Electrophilic Addition
- *Nucleophilic Substitution
- *Free Energy of Activation vs Activation Energy
- *Complex Reaction Coordinate Diagrams
- *Names and Structures of Organic Molecules
- *Alkanes
- *Cycloalkanes
- *Alkenes
- *Cycloalkenes
- *Alkynes
- *Constitutional and Geometric Isomers (cis, Z and trans, E)
- *Haloalkanes
- *Haloalkenes
- *Alcohols
- *Ethers
- *Aldehydes
- *Ketones
- *Carboxylic Acids
- *Amines
- *Identifying Primary, Secondary, Tertiary, Quaternary Carbons, Hydrogens, Nitrogens
- *Conformations of Organic Molecules
- *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
- *Cyclopropanes and Cyclobutanes
- *Cyclopentanes
- *Cyclohexanes (Chair, Boat, Geometric Isomers)
- *Calculations Using ΔG° = -RT ln K
- *ChemDraw
- *Chem3D
- Chem 14C/D Topics
- Resonance in Organic Compounds
- Stereochemistry in Organic Compounds (Chirality, Stereoisomers, R/S, d/l, Fischer Projections)
Who is online
Users browsing this forum: No registered users and 9 guests