Search found 100 matches
- Thu Mar 12, 2020 2:25 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalysts and Rates
- Replies: 10
- Views: 695
Re: Catalysts and Rates
Catalyst will increase the rate of forwarding reaction by lowering activation energy.
- Thu Mar 12, 2020 2:20 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Difference between catalyst and intermediate
- Replies: 9
- Views: 682
Re: Difference between catalyst and intermediate
Intermediates are formed and then used in the reaction process. Catalysts are present at the beginning of a reaction.
- Thu Mar 12, 2020 2:17 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalysis
- Replies: 11
- Views: 858
Re: Catalysis
catalysis decreases activation energy of a reaction
- Thu Mar 12, 2020 2:08 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: K vs k1/k'1
- Replies: 6
- Views: 1502
Re: K vs k1/k'1
both should be okay
- Thu Mar 12, 2020 1:44 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Frequency Factor
- Replies: 6
- Views: 510
Re: Frequency Factor
Frequency factor represents the collisions of molecules in the correct orientation
- Sun Mar 08, 2020 11:35 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Where do we find the values for A?
- Replies: 5
- Views: 497
Re: Where do we find the values for A?
Arrhenius equation can be used to determine A if not given.
- Sun Mar 08, 2020 11:33 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Slow step
- Replies: 4
- Views: 350
Re: Slow step
When given the mechanism, the slow step is the one that is the same as the overall reaction as the overall rate of reaction is determined by the slowest step.
- Sun Mar 08, 2020 11:30 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Intermediate Species
- Replies: 9
- Views: 730
Re: Intermediate Species
An intermediate species is one that is present in the mechanism but not in the reactants nor the products of the overall reaction.
- Sun Mar 08, 2020 11:28 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Termolecular Molecularity
- Replies: 5
- Views: 495
Re: Termolecular Molecularity
Termolecular molarity is very rare.
- Sun Mar 08, 2020 11:27 pm
- Forum: General Rate Laws
- Topic: General Rate Laws
- Replies: 7
- Views: 567
Re: General Rate Laws
We calculate the initial rate (when there are no products present).
- Sun Mar 01, 2020 5:53 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: cell potential
- Replies: 15
- Views: 850
Re: cell potential
When E is positive, delta G is negative and therefore spontaneous.
- Sun Mar 01, 2020 5:52 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: concentration cells
- Replies: 5
- Views: 389
Re: concentration cells
Concentration cells are cells in which the anode and cathode are the same element but in different concentrations.
- Sun Mar 01, 2020 5:50 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: electrolysis
- Replies: 6
- Views: 487
Re: electrolysis
Yes, electrolysis is utilized to drive non-spontaneous reactions.
- Sun Mar 01, 2020 5:47 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: units of T
- Replies: 11
- Views: 1104
Re: units of T
Also be sure to keep units consistent throughout.
- Sun Mar 01, 2020 5:35 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: how can you tell
- Replies: 11
- Views: 808
Re: how can you tell
Those controlled by kinetics are usually short and ones controlled by thermodynamics are usually longer.
- Sun Feb 23, 2020 2:49 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Gibbs free energy
- Replies: 5
- Views: 374
Re: Gibbs free energy
It is the electric charge of one mole of electrons.
- Sun Feb 23, 2020 2:47 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: What does it mean if E is negative
- Replies: 3
- Views: 690
Re: What does it mean if E is negative
As you said positive E refers to a spontaneous reaction, therefore negative E refers to a spontaneous reverse reaction or a nonspontaneous forward reaction.
- Sun Feb 23, 2020 2:42 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: salt bridge
- Replies: 5
- Views: 347
Re: salt bridge
The salt bridge is used to prevent charge imbalance.
- Sun Feb 23, 2020 2:41 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Anode vs Cathode
- Replies: 6
- Views: 405
Re: Anode vs Cathode
In a system, the anode is where oxidation occurs and the cathode is where reduction occurs.
- Sun Feb 23, 2020 2:32 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidizing/Reducing Agents
- Replies: 11
- Views: 843
Re: Oxidizing/Reducing Agents
Reducing agents provide an electron in order for a reduction reaction to occur, therefore losing an electron.
Oxidizing agents take on an electron in order for an oxidation reaction to occur, therefore gaining an electron.
Oxidizing agents take on an electron in order for an oxidation reaction to occur, therefore gaining an electron.
- Sun Feb 16, 2020 8:39 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Spontaneous
- Replies: 13
- Views: 834
Re: Spontaneous
If delta G is negative, the reaction is considered spontaneous (favorable).
- Sun Feb 16, 2020 8:37 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Equilibrium
- Replies: 15
- Views: 842
Re: Equilibrium
Neither reaction is favored at equilibrium.
- Sun Feb 16, 2020 8:35 pm
- Forum: Van't Hoff Equation
- Topic: Enthalpy, Entropy, and Gibbs Free Energy
- Replies: 7
- Views: 372
Re: Enthalpy, Entropy, and Gibbs Free Energy
Change in temperature.
- Sun Feb 16, 2020 8:34 pm
- Forum: Van't Hoff Equation
- Topic: Van Hoff's Constants
- Replies: 6
- Views: 354
Re: Van Hoff's Constants
I believe you assume standard conditions.
- Sun Feb 16, 2020 8:33 pm
- Forum: Van't Hoff Equation
- Topic: delta s
- Replies: 9
- Views: 590
Re: delta s
Delta s does not change, both s values may change but the difference between final and intitial remains constant.
- Mon Feb 10, 2020 10:21 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Exothermic reactions
- Replies: 5
- Views: 322
Re: Exothermic reactions
Lavelle briefly mentioned determining spontaneity at the beginning of thermo but I believe he'll be explaining this concept sometime this week.
- Mon Feb 10, 2020 10:17 am
- 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: Positional/Residual Entropy
- Replies: 3
- Views: 226
Re: Positional/Residual Entropy
A molecule at 0 K will have 0 residual entropy, but only if it is perfectly ordered will the molecule have 0 entropy, if it is not perfectly ordered then some entropy will still be present.
- Mon Feb 10, 2020 10:13 am
- Forum: Calculating Work of Expansion
- Topic: Midterm equation sheet
- Replies: 16
- Views: 760
Re: Midterm equation sheet
Yes, it is the same sheet.
- Mon Feb 10, 2020 10:12 am
- Forum: Calculating Work of Expansion
- Topic: Constant Volume and Pressure Values
- Replies: 8
- Views: 368
Re: Constant Volume and Pressure Values
The monoatomic values are on the constants and equations sheet.
- Mon Feb 10, 2020 10:10 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Extensive and State properties
- Replies: 3
- Views: 173
Re: Extensive and State properties
They are separate concepts I believe.
- Mon Feb 03, 2020 12:41 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Constant Volume and Pressure
- Replies: 7
- Views: 300
Re: Constant Volume and Pressure
Constant volume and pressure indicates that they do not change during the reaction.
- Mon Feb 03, 2020 12:39 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Constant pressure
- Replies: 19
- Views: 721
Re: Constant pressure
Yes, constant external pressure.
- Mon Feb 03, 2020 12:37 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Types of Systems
- Replies: 7
- Views: 463
Re: Types of Systems
A closed system can exchange heat but not matter
- Mon Feb 03, 2020 12:30 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: kinetics
- Replies: 8
- Views: 247
Re: kinetics
Kinetics is more interested in rate, whereas thermodynamics considers more only final and initial.
- Mon Feb 03, 2020 12:28 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: enthalpy
- Replies: 7
- Views: 248
Re: enthalpy
Enthalpy is the total heat of a system.
- Sun Jan 26, 2020 9:17 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Hess's Law
- Replies: 4
- Views: 178
Re: Hess's Law
Just the first I believe.
- Sun Jan 26, 2020 9:16 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Exothermic and Endothermic
- Replies: 11
- Views: 783
Re: Exothermic and Endothermic
Delta H is the enthalpy of products minus the enthalpy of reactants.
- Sun Jan 26, 2020 9:11 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Meaning of State Function
- Replies: 8
- Views: 247
Re: Meaning of State Function
State function means it is independent of path taken. Work is an example of NOT a state function, it is dependent on path taken.
- Sun Jan 26, 2020 9:04 pm
- Forum: Phase Changes & Related Calculations
- Topic: Why does steam cause burns?
- Replies: 29
- Views: 1355
Re: Why does steam cause burns?
The diagram Lavelle showed in class was the temperature curve of water.
- Sun Jan 26, 2020 8:56 pm
- Forum: Phase Changes & Related Calculations
- Topic: Phase Changes
- Replies: 7
- Views: 249
Re: Phase Changes
Add the enthalpy of the phase change.
- Wed Jan 15, 2020 2:54 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Le Chatelier's Principle
- Replies: 6
- Views: 988
Re: Le Chatelier's Principle
Yes, but K remains constant.
- Wed Jan 15, 2020 2:52 pm
- Forum: Phase Changes & Related Calculations
- Topic: Autoprotolysis
- Replies: 15
- Views: 865
Re: Autoprotolysis
Autoprotolysis is proton transfer between the same type of molecule.
- Wed Jan 15, 2020 2:49 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Reaction shifts right or left?
- Replies: 14
- Views: 1616
Re: Reaction shifts right or left?
Yes, a shift to the left favors the reverse reaction so more reactants will be made. A shift to the right favors the forward reaction so more products will be made.
- Wed Jan 15, 2020 2:39 pm
- Forum: Ideal Gases
- Topic: bars vs atm
- Replies: 8
- Views: 307
Re: bars vs atm
Mainly ensure consistency with units.
- Wed Jan 15, 2020 2:34 pm
- Forum: Ideal Gases
- Topic: equilibrium constant
- Replies: 5
- Views: 201
Re: equilibrium constant
Most simply, K= Products/Reactants
- Fri Jan 10, 2020 9:58 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Do solids and liquids count in Q?
- Replies: 5
- Views: 255
Re: Do solids and liquids count in Q?
Q is calculated in the same manner as K, so no.
- Fri Jan 10, 2020 9:56 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: liquids and aqueous solutions
- Replies: 4
- Views: 130
Re: liquids and aqueous solutions
K is dependent on concentration.
- Fri Jan 10, 2020 9:53 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Comparing K and Q
- Replies: 6
- Views: 300
Re: Comparing K and Q
Q can give us an indication of the reaction in that it can identify whether the forward or reverse reaction is favored in order to reach equilibrium at a given moment.
- Fri Jan 10, 2020 9:50 am
- Forum: Ideal Gases
- Topic: 5G1 true/false
- Replies: 8
- Views: 292
Re: 5G1 true/false
Q would be larger but ultimately the reaction would reach equilibrium and K remains the same.
- Fri Jan 10, 2020 9:46 am
- Forum: Ideal Gases
- Topic: Reaction Quotient (Q)
- Replies: 8
- Views: 348
Re: Reaction Quotient (Q)
Q is calculated in the same manner as K and used as a comparison to identify if given concentrations of a reaction are at equilibrium.
- Sat Dec 07, 2019 10:24 pm
- Forum: Biological Examples
- Topic: Chemotherapy drugs
- Replies: 7
- Views: 539
Re: Chemotherapy drugs
Transplatin may also be useful to know.
- Sat Dec 07, 2019 10:19 pm
- Forum: Polyprotic Acids & Bases
- Topic: polyprotic acids
- Replies: 5
- Views: 412
Re: polyprotic acids
The negative charge created after the first dissociation makes it more difficult for the second dissociation to occur.
- Sat Dec 07, 2019 10:17 pm
- Forum: Calculating the pH of Salt Solutions
- Topic: Sig Figs for logarithmic funcitons
- Replies: 6
- Views: 460
Re: Sig Figs for logarithmic funcitons
I believe sig figs are also counted after the decimal when provided a pH and you are asked to give some numerical number, say a concentration for example. It was briefly mentioned by my TA.
- Sat Dec 07, 2019 10:13 pm
- Forum: Polyprotic Acids & Bases
- Topic: How can you tell
- Replies: 18
- Views: 1081
Re: How can you tell
Typically, there will be more than one hydrogen.
- Sat Dec 07, 2019 10:07 pm
- Forum: Air Pollution & Acid Rain
- Topic: dirty/clean coal
- Replies: 6
- Views: 448
Re: dirty/clean coal
I think the main takeaway is that dirty coal has sulfur in it.
- Tue Nov 26, 2019 9:54 am
- Forum: Amphoteric Compounds
- Topic: Oxides
- Replies: 4
- Views: 408
Re: Oxides
It is most useful to know the patterns of the periodic table.
- Tue Nov 26, 2019 9:50 am
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Why are inorganic acids stronger?
- Replies: 8
- Views: 1340
Re: Why are inorganic acids stronger?
Stronger acids are characterized by their ability to lose hydrogen ions more easily. It is in this way that strong acids can reach 100% ionization when dissociating in water.
- Tue Nov 26, 2019 9:48 am
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Use of Bronsted or Lewis Definitions
- Replies: 7
- Views: 406
Re: Use of Bronsted or Lewis Definitions
Both should be okay.
- Tue Nov 26, 2019 9:38 am
- Forum: Bronsted Acids & Bases
- Topic: Equlibrium Constant Expression for Strong Acids/Bases
- Replies: 3
- Views: 159
Re: Equlibrium Constant Expression for Strong Acids/Bases
Strong acids/bases are assumed, when approximating, to reach 100% ionization. Therefore, the denominator of the equilibrium constant equation is essentially zero which is why we do not use the equilibrium constant for strong acids/bases.
- Tue Nov 26, 2019 9:35 am
- Forum: Lewis Acids & Bases
- Topic: When is an acid considered Bronsted?
- Replies: 9
- Views: 618
Re: When is an acid considered Bronsted?
There simply exist two common ways of defining an acid (or a base). Both the Bronsted definition and Lewis definition refer to the same thing yet identify it in different ways.
- Sun Nov 24, 2019 6:37 pm
- Forum: Hybridization
- Topic: Strength of sigma vs pi bonds
- Replies: 6
- Views: 195
Re: Strength of sigma vs pi bonds
Sigma bonds are stronger due to greater overlap end-to-end but also be sure to remember sigma bonds allow for rotation whereas pi bonds are rigid.
Re: Prefixes
If the ligand already has a name with di-, tri-, tetra-, or polydentate.
- Sun Nov 24, 2019 6:29 pm
- Forum: Naming
- Topic: Week 9 and Week 10 HW?
- Replies: 21
- Views: 1081
Re: Week 9 and Week 10 HW?
Should be fine as long as you let your TA know.
- Sun Nov 24, 2019 6:20 pm
- Forum: Naming
- Topic: Coordination number
- Replies: 7
- Views: 419
Re: Coordination number
The coordination number is determined by the bonds to the central atom.
- Sun Nov 24, 2019 5:46 pm
- Forum: Hybridization
- Topic: How does hybridization happen?
- Replies: 3
- Views: 300
Re: How does hybridization happen?
Hybridization is the mixture of valence atomic orbitals during bond formation to explain the observed structure.
- Sun Nov 17, 2019 8:35 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Test 2
- Replies: 19
- Views: 910
Re: Test 2
Technically, the shape does not matter in a lewis structure, although Lavelle said drawing them symmetrically (or now similar to VSEPR model) would help to visualize the molecule.
- Sun Nov 17, 2019 8:31 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond angle
- Replies: 3
- Views: 245
Re: Bond angle
I believe that we will have to know slightly less/more and be able to make comparisons between two bond angles (ex. which is less?).
- Sun Nov 17, 2019 8:18 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: This Week Test
- Replies: 12
- Views: 779
Re: This Week Test
Nick Lewis 3D wrote:Have we gone over sigma and pi bonds yet? Do we have any more information about what exact material will be tested?
Lavelle said he would discuss sigma and pi bonds on Monday.
- Sun Nov 17, 2019 8:16 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: Dipole
- Replies: 3
- Views: 281
Re: Dipole
Dipoles cancel in the same way which vectors cancel. A vector can be broken down into a component in each direction. When summed, vectors that equal 0 are dipoles that cancel.
- Sun Nov 17, 2019 8:09 pm
- Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
- Topic: Rod vs spherical shaped molecules
- Replies: 10
- Views: 1741
Re: Rod vs spherical shaped molecules
Rod-shaped molecules allow for instantaneous dipoles to be closer and thereby stronger because rod-shaped molecules can align with more surface area close to other nearby rod-shaped molecules.
- Mon Nov 11, 2019 1:42 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Boiling and Melting Points
- Replies: 7
- Views: 579
Re: Boiling and Melting Points
As intermolecular forces increase, the structure becomes more stable and therefore the melting/boiling points will also increase.
- Mon Nov 11, 2019 1:39 am
- Forum: Bond Lengths & Energies
- Topic: Size
- Replies: 13
- Views: 843
Re: Size
As atomic radius increases, bond length also increases.
- Mon Nov 11, 2019 1:36 am
- Forum: Electronegativity
- Topic: dipole moments
- Replies: 7
- Views: 346
Re: dipole moments
Yes a greater difference in electronegativity typically results in a greater bond dipole moment.
- Mon Nov 11, 2019 1:30 am
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polar vs covalent
- Replies: 7
- Views: 458
Re: Polar vs covalent
You can use general trends of electronegativity in the periodic table.
- Mon Nov 11, 2019 1:29 am
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Anions
- Replies: 7
- Views: 469
Re: Anions
Anions are polarizable (exhibiting distortion) whereas cations have polarizing power (distorting anions).
- Sun Nov 03, 2019 11:14 am
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: polarizing power
- Replies: 2
- Views: 177
Re: polarizing power
Ions which cause large distortions.
- Sun Nov 03, 2019 10:59 am
- Forum: Dipole Moments
- Topic: Midterm
- Replies: 8
- Views: 379
Re: Midterm
I believe he said up to Friday's lecture, excluding the last powerpoint slide.
- Sun Nov 03, 2019 10:44 am
- Forum: Electronegativity
- Topic: electronegativity trend
- Replies: 9
- Views: 731
Re: electronegativity trend
Electrons will be further away from the nucleus in increasing shells, therefore pull on electrons is less.
- Sun Nov 03, 2019 10:38 am
- Forum: Resonance Structures
- Topic: Resonance Stability
- Replies: 3
- Views: 217
Re: Resonance Stability
A molecule with resonance has more stability as the multiple bonds can exist in various positions throughout the molecule.
- Sun Nov 03, 2019 10:25 am
- Forum: Octet Exceptions
- Topic: Expanded Octets and Formal Charge
- Replies: 3
- Views: 122
Re: Expanded Octets and Formal Charge
The expanded octet rule applies for atoms on the periodic table row 3 and beyond because electrons can utilize the d subshell.
- Sun Oct 27, 2019 5:50 pm
- Forum: Lewis Structures
- Topic: Lone pair
- Replies: 8
- Views: 416
Re: Lone pair
A lone pair is a pair of electrons not shared with another atom.
- Sun Oct 27, 2019 5:48 pm
- Forum: Ionic & Covalent Bonds
- Topic: Resonance
- Replies: 10
- Views: 432
Re: Resonance
Resonance indicates that you can put double bonds in different positions when drawing lewis structures.
- Sun Oct 27, 2019 5:42 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization energy
- Replies: 12
- Views: 650
Re: Ionization energy
Ionization energy is also important when drawing lewis structures as the atom with the lowest ionization energy is typically drawn as the central atom.
- Sun Oct 27, 2019 5:39 pm
- Forum: Trends in The Periodic Table
- Topic: Central Atom
- Replies: 13
- Views: 570
Re: Central Atom
Typically you choose the atom with the lowest ionization energy as the central atom.
- Sun Oct 27, 2019 5:30 pm
- Forum: Trends in The Periodic Table
- Topic: Electron affinity.
- Replies: 8
- Views: 307
Re: Electron affinity.
Electron affinity is essentially the amount of energy spent when an electron is added to a neutral atom, forming an anion.
- Sat Oct 19, 2019 7:25 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Correlation Between n and l
- Replies: 6
- Views: 289
Re: Correlation Between n and l
l is the angular momentum quantum number or "shape."
- Sat Oct 19, 2019 7:21 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Heisenberg
- Replies: 4
- Views: 232
Re: Heisenberg
It is a measure of uncertainty since it cannot be exactly determined the momentum and position of a particle simultaneously.
- Sat Oct 19, 2019 7:15 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Orbitals in relation to arrows
- Replies: 10
- Views: 701
Re: Orbitals in relation to arrows
Hund's rule asserts that due to electron repulsion, electrons in the same subshell occupy different orbitals with parallel spin. Parallel spin indicates that electrons have the same spin whereas 2 electrons with opposite spin are paired.
- Sat Oct 19, 2019 7:07 pm
- Forum: *Shrodinger Equation
- Topic: Schrodinger Equation
- Replies: 4
- Views: 176
Re: Schrodinger Equation
It allows us to calculate an electron's wave function.
- Sat Oct 19, 2019 7:06 pm
- Forum: Photoelectric Effect
- Topic: Work Funtion
- Replies: 2
- Views: 136
Work Funtion
What is the difference between the work function and threshold energy?
- Sat Oct 12, 2019 4:20 pm
- Forum: Properties of Electrons
- Topic: Speed of an Electron
- Replies: 3
- Views: 226
Re: Speed of an Electron
Typically, less than the speed of light.
- Sat Oct 12, 2019 3:42 pm
- Forum: Photoelectric Effect
- Topic: Energy in Photoelectric Effect
- Replies: 5
- Views: 189
Re: Energy in Photoelectric Effect
If threshold energy is surpassed, electrons will be emitted. Given the amount of energy is greater than threshold, the number of electrons emitted is dependent on intensity.
- Sat Oct 12, 2019 3:27 pm
- Forum: DeBroglie Equation
- Topic: De Broglie's Equation
- Replies: 13
- Views: 593
Re: De Broglie's Equation
Any moving particle with momentum, cannot be applied to light.
- Sat Oct 12, 2019 3:20 pm
- Forum: Properties of Light
- Topic: Frequency vs. Wavelength
- Replies: 15
- Views: 740
Re: Frequency vs. Wavelength
Frequency and wavelength are inversely proportional, this can be seen using the formula c = λv.
- Sat Oct 12, 2019 3:12 pm
- Forum: Properties of Light
- Topic: Diffraction and Water
- Replies: 4
- Views: 198
Re: Diffraction and Water
I believe he was just trying to give a visual example. When you drop two rocks in the water next to each other, it is easy to see how the waves (ripples in the water) interact with each other and form both constructive and destructive interference.
- Sun Oct 06, 2019 4:35 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: avogadro's number
- Replies: 4
- Views: 331
Re: avogadro's number
Typically when converting between molecules and moles.
1 mole = 6.022 * 10^23 molecules
1 mole = 6.022 * 10^23 molecules
- Sun Oct 06, 2019 4:32 pm
- Forum: SI Units, Unit Conversions
- Topic: Unit Conversions
- Replies: 11
- Views: 632
Re: Unit Conversions
Divide by Avogadro's number.
1 mole = 6.022 * 10^23 atoms (molecules)
1 mole = 6.022 * 10^23 atoms (molecules)
- Sun Oct 06, 2019 4:21 pm
- Forum: Limiting Reactant Calculations
- Topic: Order of atoms in molecules
- Replies: 6
- Views: 274
Re: Order of atoms in molecules
My TA said that it may be ordered in any way and will still be an acceptable answer, at least for now.
- Sun Oct 06, 2019 4:09 pm
- Forum: Empirical & Molecular Formulas
- Topic: What decimal place to round to when taking masses from the Periodic Table?
- Replies: 19
- Views: 3019
Re: What decimal place to round to when taking masses from the Periodic Table?
I think it is best to use the entire figure given, then round the final answer based on sig figs.
- Sun Oct 06, 2019 3:51 pm
- Forum: Properties of Light
- Topic: m/s^-1
- Replies: 4
- Views: 234
Re: m/s^-1
(m.s^-1) is a different way of expressing (m/s); the meaning is the same.