Search found 75 matches
- Thu Mar 14, 2019 5:17 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Nernst Equation
- Replies: 1
- Views: 308
Re: Nernst Equation
The Nernst Equation E=E°-(RT)/(NF)lnQ can be used to find the concentration by solving in all the known values and then solving for Q. Then you can write down the formula for Q based on the reaction of the problem and plug in the known molarities to solve for the specific element's concentration you...
- Thu Mar 14, 2019 5:14 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Reducing power
- Replies: 4
- Views: 469
Re: Reducing power
The more positive standard reduction potential is the stronger oxidizing agent- so is more likely to be reduced or gain electrons.
The more negative standard reduction potential is the stronger reducing agent- so it is more likely to be oxidized or lose electrons.
The more negative standard reduction potential is the stronger reducing agent- so it is more likely to be oxidized or lose electrons.
- Thu Mar 14, 2019 5:03 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Intermediate vs catalyst
- Replies: 8
- Views: 853
Re: Intermediate vs catalyst
A catalyst is used up in the beginning and then later recreated.
An intermediate is not there initially but is later formed as a product which cancels out with the next step.
An intermediate is not there initially but is later formed as a product which cancels out with the next step.
- Sun Mar 10, 2019 8:51 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidation vs Reduction Half Rxn
- Replies: 9
- Views: 1076
Re: Oxidation vs Reduction Half Rxn
Oxidation is when the species loses electrons and reduction is when the species gains electrons. You would calculate the charge of the species based on its presence in the compound with known charges of elements. The oxidation would have electrons on the right side and the reduction would have elect...
- Sun Mar 10, 2019 8:33 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Injecting noble gasses
- Replies: 7
- Views: 790
Re: Injecting noble gasses
Noble/ Inert gases do not affect the equilibrium or shifting of the equation at all. This is because the partial pressures of the gas do not change within the reaction.
- Sun Mar 10, 2019 8:31 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell diagram
- Replies: 6
- Views: 619
Re: Cell diagram
If one side of the reaction (anode or cathode) does not have a solid component, than Pt (a solid) must be added in order to have a solute.
- Thu Mar 07, 2019 1:32 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: how is kinetics different?
- Replies: 17
- Views: 1680
Re: how is kinetics different?
Thermodynamics determines the spontaneity of the reaction, but will not tell if the reaction will occur slowly or quickly. We use kinetics to determine the rate of the actual reaction, dependent on the rate law constant; if the activation energy is high then the constant will be smaller and vice ver...
- Thu Mar 07, 2019 1:30 pm
- Forum: First Order Reactions
- Topic: Half-Life 1st Order Reaction
- Replies: 6
- Views: 684
Re: Half-Life 1st Order Reaction
For the first order
the half life equation is t(1/2)= ln2/k.
It is applicable to all first order rate reactions.
the half life equation is t(1/2)= ln2/k.
It is applicable to all first order rate reactions.
- Thu Mar 07, 2019 1:29 pm
- Forum: General Rate Laws
- Topic: Rate Laws 0-2
- Replies: 2
- Views: 265
Re: Rate Laws 0-2
Yes if you plot [A] vs time and it is a straight line, it is the 0th order.
If you plot ln[A] vs time and it is a straight line, it is the 1st order.
If you plot 1/[A] vs time and it is a straight line, it is the 2nd order.
If you plot ln[A] vs time and it is a straight line, it is the 1st order.
If you plot 1/[A] vs time and it is a straight line, it is the 2nd order.
- Tue Mar 05, 2019 7:35 pm
- Forum: Zero Order Reactions
- Topic: Initial reactions rates
- Replies: 3
- Views: 473
Re: Initial reactions rates
You don't have to take into consideration the reverse reaction, and by analyzing the initial reaction rates, you are also looking at the maximum possible rate of the reaction. It is also easier to calculate because the initial concentrations of the reaction are usually given.
- Tue Mar 05, 2019 7:33 pm
- Forum: General Rate Laws
- Topic: Unique Rate
- Replies: 4
- Views: 418
Re: Unique Rate
A unique rate is a rate of appearance/disappearance of any of the species in a reaction divided by its stoichiometric coefficient. A unique rate will be the same for each reactant or product. When you calculate the average rate, the coefficient is not taken into the account, so the average rate can ...
- Tue Mar 05, 2019 7:31 pm
- Forum: General Rate Laws
- Topic: does k change if rxn is multiplied?
- Replies: 6
- Views: 1559
Re: does k change if rxn is multiplied?
k should not change even if the coefficients are changed.
- Thu Feb 28, 2019 1:37 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Organization of cell diagrams
- Replies: 9
- Views: 855
Re: Organization of cell diagrams
Yes because you need a solid for electron current change.
- Thu Feb 28, 2019 1:37 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: anode and cathode placement
- Replies: 3
- Views: 374
Re: anode and cathode placement
The anode is on the left of the cell diagram, with solid electrodes on the outside and aqueous on the inside next to the salt bridge. The Cathode is on the right of the cell diagram, with solids on the outside and aqueous on the inside as well. You must add Platinum if they is no solid in the equati...
- Sun Feb 24, 2019 2:35 pm
- Forum: Calculating Work of Expansion
- Topic: Equations for work
- Replies: 7
- Views: 911
Re: Equations for work
The first and second equations are the same; the second one simplified equals the first equation. These equations are used for situations in which the pressure is constant. However in irreversible functions in which the pressure is not constant, you would use the third equation. They all solve for w...
- Sun Feb 24, 2019 2:30 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Spontaneity
- Replies: 8
- Views: 826
Re: Spontaneity
delta G= 0 is at equilibrium
delta G >0 is not spontaneous
delta G < 0 spontaneous
delta G >0 is not spontaneous
delta G < 0 spontaneous
- Sun Feb 24, 2019 2:28 pm
- Forum: Balancing Redox Reactions
- Topic: difference between oxidation and reduction
- Replies: 8
- Views: 997
Re: difference between oxidation and reduction
In oxidation, electrons are removed. This means that the charge becomes more positive. In reduction, electrons are added on. This means that the charge will become more negative. This scenario is oxidation because the element became more positive, thus lost electrons.
- Wed Feb 20, 2019 11:38 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: entropy
- Replies: 4
- Views: 627
Re: entropy
Entropy (S) is the measure of disorder. Enthalpy (H) is the measure of total heat content.
- Wed Feb 20, 2019 11:37 pm
- Forum: Balancing Redox Reactions
- Topic: Week 7 Homework
- Replies: 15
- Views: 1253
Re: Week 7 Homework
Anything about Gibbs Free Energy and the Start of Outline 5 are applicable for Week 7 Homework.
- Wed Feb 20, 2019 11:36 pm
- Forum: Balancing Redox Reactions
- Topic: H+ vs H3O+
- Replies: 10
- Views: 1010
Re: H+ vs H3O+
Use H+ for redox reactions.
- Tue Feb 12, 2019 9:52 pm
- Forum: Calculating Work of Expansion
- Topic: when do I use 3/2R??
- Replies: 4
- Views: 2537
Re: when do I use 3/2R??
Change in Entropy= nCln(T2/T1). When volume is constant the value C is Cv and is equal to 3/2R. This is also the case for monatomic gases.
- Tue Feb 12, 2019 9:50 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: practice midterm question
- Replies: 3
- Views: 410
Re: practice midterm question
You know the general equation for combustion is "molecule" + O2= CO2 + H20. So you would write out the combustion equations for all three of the molecules for which the heat of combustion is given. Then you would rearrange those equations to have the correct molecules cancel out to form th...
- Fri Feb 08, 2019 5:05 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Adiabatic isolated system vs isolated system.
- Replies: 1
- Views: 292
Re: Adiabatic isolated system vs isolated system.
The term adiabatic means that there is no heat flow, or that q= 0. This means that the change in internal energy or (delta U) is going to be equal to w. In an isolated system there is no flow of matter or energy from the system to the surroundings.
- Fri Feb 08, 2019 5:00 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: q= -w
- Replies: 8
- Views: 721
Re: q= -w
This is because of the equation delta U= q+ w. If there is no change in internal energy, then consequently the opposite of w will equal q.
- Fri Feb 08, 2019 4:57 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: State Function
- Replies: 3
- Views: 385
Re: State Function
A state function does not depend on the path taken, only the start and end states of the system are taken into account. Delta U is only dependent on the final result so therefore is a state function. However q and w are both described by the path it took to calculate that value, and therefore are no...
- Tue Jan 29, 2019 7:21 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Best Method
- Replies: 7
- Views: 820
Re: Best Method
I would use Hess' Law if the total deltaH is given of the reaction to add the two reactions, but if the total change in heat is not given I would use the Hf tables to find the specific heats of each of the reactants and products and add those to get the total deltaH.
- Tue Jan 29, 2019 7:12 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Calorimeter
- Replies: 4
- Views: 446
Re: Calorimeter
A calorimeter is a tool used to measure the amount of heat used in a chemical reaction or process. It is used by measuring the temperature difference of the reaction.
- Tue Jan 29, 2019 7:02 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Enthalpy
- Replies: 4
- Views: 456
Re: Enthalpy
Enthalpy is the study of heat absorbed or released in a chemical reaction. So when you calculate the change of heat in a system, you are calculating the enthalpy of the system. It can be represented by deltaH.
- Tue Jan 29, 2019 6:49 pm
- Forum: Calculating Work of Expansion
- Topic: HW problem 4A.3 from 7th edition
- Replies: 1
- Views: 193
Re: HW problem 4A.3 from 7th edition
That is just the standard volume equation for a cylinder, and since volume is not constant for this piston we would use this equation to find out the change in volume for the pump. This is a standard math equation that should be known I believe, it is not on the constants and equations sheet.
- Tue Jan 22, 2019 8:57 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: What Happens to a Reaction if Inert Gas is Added?
- Replies: 7
- Views: 2296
Re: What Happens to a Reaction if Inert Gas is Added?
The addition of inert gas does not affect which side the equation favors, and the equilibrium constant does not change as well.
- Tue Jan 22, 2019 8:55 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Changing pressure
- Replies: 3
- Views: 349
Re: Changing pressure
When the pressure is increased, the volume is decreased, and the concentration is increased in a system, it will favor the side of the reaction with the less moles of gas. The vice versa is true as well. Because there are two moles of gas on both sides of the reaction, neither side will be favored.
- Tue Jan 22, 2019 8:52 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ignoring x
- Replies: 16
- Views: 3366
Re: ignoring x
You can ignore x in some instances because the amount that dissociates will be so little that it is insignificant to the overall decrease in the molarity. If the K value is extremely small, namely less than 10^-3, it means that reactants are favored in the reaction and so little of the reactants wil...
- Wed Jan 16, 2019 5:32 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Temperature and Equilibrium
- Replies: 3
- Views: 368
Re: Temperature and Equilibrium
In an exothermic reaction one can almost consider heat as the product of the reaction. This means that as temperature increase the equilibrium would shift towards the left, because the temperature on the right, or number of "products" increased. Vice Versa, for an endothermic reaction, hea...
- Wed Jan 16, 2019 5:28 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Acids
- Replies: 6
- Views: 514
Re: Acids
The strong acids include HCl, HNO3, H2SO4, HBr, HI, HClO4, and HClO3.
The strong bases include LiOH, NaOH, KOH, RbOH, CsOH, Ca(OH)2, Sr(OH)2, and Ba(OH)2.
The strong bases include LiOH, NaOH, KOH, RbOH, CsOH, Ca(OH)2, Sr(OH)2, and Ba(OH)2.
- Wed Jan 16, 2019 5:24 pm
- Forum: Conjugate Acids & Bases
- Topic: Cojugate Acids and Bases
- Replies: 10
- Views: 2196
Re: Cojugate Acids and Bases
A base with a hydrogen ion attached to it is a conjugate acid. An acid with a hydrogen ion taken away from it is a conjugate base.
- Fri Jan 11, 2019 7:04 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Solids and Liquids in Rxn
- Replies: 6
- Views: 613
Re: Solids and Liquids in Rxn
Solids and liquids are not included in the equilibrium constant equation. They are put in as a value of 1 and only gases and aqueous elements are considered when solving for the equilibrium constant.
- Fri Jan 11, 2019 7:01 pm
- Forum: Ideal Gases
- Topic: Q and K [ENDORSED]
- Replies: 35
- Views: 3193
Re: Q and K [ENDORSED]
Q and K have the same formula, they are both the concentration of the products divided by the concentration of reactants.
- Fri Jan 11, 2019 7:01 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kp vs Kc
- Replies: 6
- Views: 629
Re: Kp vs Kc
neither is more important, it depends on the situation. You use kp for partial pressure, and kc for when the concentration is given.
- Sat Dec 08, 2018 9:02 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: A X5 E
- Replies: 6
- Views: 689
Re: A X5 E
square pyramidal. With less than 90 degree bond angles.
- Sat Dec 08, 2018 9:01 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic Character
- Replies: 4
- Views: 603
Re: Ionic Character
This is based on the electro negativity difference. The greater the electronegative difference, the more ionic the molecule is. Because oxygen is more electronegative than sulfur, co2 would have greater ionic character even though it is not an ionic molecule. Neither are.
- Wed Dec 05, 2018 6:39 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Calculate the strength of an acid?
- Replies: 3
- Views: 423
Re: Calculate the strength of an acid?
no just know that the ph is -log(H+).
- Wed Dec 05, 2018 6:35 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: Identifying the difference
- Replies: 3
- Views: 235
Re: Identifying the difference
If they increase the H+ or H3O+ concentration in the solution, it is an acid. If they increase the OH- concentration in the solution, it is a base.
- Wed Dec 05, 2018 6:28 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Unidentate
- Replies: 3
- Views: 406
Re: Unidentate
Monodentate means that there is only one binding site from the central transition metal to the connecting ligand. Polydentate means there are more than one binding site.
- Sat Dec 01, 2018 5:19 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: AXE formula
- Replies: 32
- Views: 12258
Re: AXE formula
yes you can determine the molecular shape of the molecule, knowing the AXE formula because the number of electron densities are known. By counting the number of lone pairs and the number of atoms around the central atom you can know the shape and bond angles.
- Sat Dec 01, 2018 5:07 pm
- Forum: Lewis Acids & Bases
- Topic: Resonance Structures
- Replies: 4
- Views: 501
Re: Resonance Structures
The resonance structure does not matter. You can classify an acid by if it accepts electrons, but if it donates electrons then the molecule is a base.
- Sat Dec 01, 2018 5:04 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polar Molecules
- Replies: 12
- Views: 938
Re: Polar Molecules
You check for the net dipole moment of the molecule. If the dipole moments cancel out because if the symmetric structure of the molecule, then it is non polar. If there is a net dipole moment, the molecule is polar.
- Mon Nov 26, 2018 4:26 pm
- Forum: Hybridization
- Topic: Lone pair
- Replies: 4
- Views: 440
Re: Lone pair
it is solely dependent on the number of electron densities so we would consider all bonds (single, double, triple) and lone pairs as 1 region of electron density. therefore the hybridization would be sp3.
- Mon Nov 26, 2018 4:23 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Determining Shape
- Replies: 4
- Views: 493
Re: Determining Shape
the electron geometry would be trigonal planar, because we are not considering lone pairs, only the atoms. However if we want to know the shape, we would take into consideration the lone pairs of the structure, 1, so the shape would be bent.
- Mon Nov 26, 2018 4:20 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR shape
- Replies: 4
- Views: 478
Re: VSEPR shape
this is dependent on whether lone pairs are present on this structure or not. For the steric number of 4, with no lone pairs the shape is tetrahedral, with one lone pair it is trigonal pyramidal, and with two lone pair it is bent. For the steric number of 5, with no lone pairs the shape is trigonal ...
- Mon Nov 26, 2018 4:18 pm
- Forum: Hybridization
- Topic: Hybridization
- Replies: 2
- Views: 294
Re: Hybridization
hybridization occurs, because when we observe the lewis dot structure of an element we see that they have more electrons attached than the traditional orbitals allot. To accommodate the excess electrons, hybrid orbitals are created which are in between the energy levels of the orbitals they are hybr...
- Mon Nov 26, 2018 4:15 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligand
- Replies: 4
- Views: 425
Re: Ligand
A ligand can be classified as a Lewis base or something that is a electron pair donor. They bind to a central metal atom to form a complex.
- Mon Nov 26, 2018 4:13 pm
- Forum: Bond Lengths & Energies
- Topic: Atom Size and Bond Strength
- Replies: 2
- Views: 417
Re: Atom Size and Bond Strength
a larger atom has weaker bonds because the valence electrons are at a further distance from the nucleus and therefore decreases the electronegativity of the atom because there is a weaker pull. You can refer to an atom's size with all three of these terms.
- Fri Nov 16, 2018 4:23 pm
- Forum: Dipole Moments
- Topic: Dipole Moments
- Replies: 6
- Views: 634
Re: Dipole Moments
Dipoles are created by a charge difference between molecules, with a separation of positive charge and a negative charge within a distance. The dipole arrow points towards the more electronegative atom in the molecule.
- Fri Nov 16, 2018 4:07 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: bonds
- Replies: 2
- Views: 302
Re: bonds
Sigma Bonding are bonds from end to end. They always occur before pi bonds, and only exist as one bond. Pi bonds are sideways bonds that are overlapping and are weaker than sigma bonds. After the initial sigma bond in double or triple bonds, pi bonds exist.
- Fri Nov 16, 2018 3:31 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: H-Bonding
- Replies: 8
- Views: 2263
Re: H-Bonding
Hydrogen Bonding is between H and N,O, F and is strongest of intermolecular forces.
- Sat Nov 10, 2018 12:31 pm
- Forum: Resonance Structures
- Topic: Resonance with formal charge
- Replies: 6
- Views: 618
Re: Resonance with formal charge
yes it can still have resonance. The formal charge is used to find the most stable Lewis electron dot structure, ones with elements of formal charge closest to 0.
- Sat Nov 10, 2018 12:26 pm
- Forum: Balancing Chemical Reactions
- Topic: Combustion Equation
- Replies: 21
- Views: 2843
Re: Combustion Equation
generally the equation is CxHyOz + O2= CO2 + H20
- Sat Nov 10, 2018 12:25 pm
- Forum: Lewis Structures
- Topic: Lewis Structure
- Replies: 10
- Views: 848
Re: Lewis Structure
1) count number of valence electrons 2) put element with lowest ionization energy in middle 3) draw single bonds plus lone electrons to complete octet around all elements 4) check total electron number to match number of electrons, adjust accordingly 5) check formal charges around all elements to ge...
- Fri Nov 02, 2018 2:41 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Scantron
- Replies: 6
- Views: 607
Re: Scantron
I believe they provide the scantrons for us at the midterm.
- Fri Nov 02, 2018 2:34 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Exceptions to the Octet Rule
- Replies: 2
- Views: 258
Re: Exceptions to the Octet Rule
For chemistry 14a, we are only using the exception to the octet rule to accommodate for the d block. So any element in the 3rd period or beyond can have an expanded octet. I don't believe we have to expand this rule for the f block yet in this class.
- Fri Nov 02, 2018 2:32 pm
- Forum: Octet Exceptions
- Topic: The center atom
- Replies: 20
- Views: 3319
Re: The center atom
The element with the lowest ionization energy is in the middle of the structure when drawing Lewis dot structure. Ionization energy increases across the period and decreases down the group.
- Fri Nov 02, 2018 2:30 pm
- Forum: Lewis Structures
- Topic: Formal Charge Tricks
- Replies: 5
- Views: 3611
Re: Formal Charge Tricks
A shortcut you can use for formal charge is to take the total number of valence electrons and subtract the lines and dots surrounding the atom. so FC= VE -(# of lines/bonds + # of dots).
- Thu Oct 25, 2018 4:19 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: X,Y,and Z in reference to 3p orbital
- Replies: 5
- Views: 627
Re: X,Y,and Z in reference to 3p orbital
ml= -1 would be px
ml= 0 would be py
ml= 1 would be pz
ml= 0 would be py
ml= 1 would be pz
- Thu Oct 25, 2018 4:15 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Question about H electron configuration
- Replies: 3
- Views: 498
Re: Question about H electron configuration
The electron configuration for H is 1s1 and for He is 1s2. If the element is stated as being an anion or cation then you would accordingly add or remove electrons.
- Thu Oct 25, 2018 4:14 pm
- Forum: Administrative Questions and Class Announcements
- Topic: 0/70 homework grade on myucla
- Replies: 2
- Views: 362
Re: 0/70 homework grade on myucla
I do not have that, but I would assume your TA has not updated the grades in the grade book yet. I have a 7/70 but have turned in homework all 3 weeks too. Don't worry about it because grades are not finalized yet.
- Sun Oct 21, 2018 4:57 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Heisenberg Post Module Assessment #16
- Replies: 2
- Views: 1703
Re: Heisenberg Post Module Assessment #16
The answer is C, because you can not know both the momentum and position of an electron in an orbital simultaneously and if one is known the precision in which you can know the other decreases.
- Sun Oct 21, 2018 4:55 pm
- Forum: Properties of Electrons
- Topic: Electrons - Wave Properties
- Replies: 4
- Views: 392
Re: Electrons - Wave Properties
electrons have a measurable wavelength and can be found by using De Broglie's equation (wavelength)= h/p.
- Sun Oct 21, 2018 4:51 pm
- Forum: *Shrodinger Equation
- Topic: Shrodinger Explained
- Replies: 2
- Views: 249
Re: Shrodinger Explained
schrodinger's equation represents a wave function and consists of quantum numbers to label orbitals and describe wave function. Those quantum numbers are n, which is the principal quantum number and represents the energy level, l, which represents the shape of the orbital, and ml, which represents t...
- Sun Oct 21, 2018 4:43 pm
- Forum: Properties of Light
- Topic: Intensity vs energy
- Replies: 6
- Views: 765
Re: Intensity vs energy
intensity directly relates to the number of photons in the light. So if the number of photons increases, then the intensity increases/ gets brighter even if the type (wavelength or frequency) of photon did not change.
- Fri Oct 12, 2018 3:15 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Wave Properties of electrons
- Replies: 2
- Views: 191
Re: Wave Properties of electrons
If the peaks and troughs of a wave match up then they are constructive and when the two waves match up then their amplitudes will increase because they both help to build each other. However when the peak and trough of two waves hit then they become destructive and the wave amplitude will decrease. ...
- Fri Oct 12, 2018 3:09 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Effect Initial Purpose
- Replies: 4
- Views: 445
Re: Photoelectric Effect Initial Purpose
They thought that the Kinetic Energy of electrons released would be proportional to the INTENSITY of the light. However they found that was not the case, and actually the frequency correlated to the release of electrons.
- Fri Oct 12, 2018 3:03 pm
- Forum: Properties of Light
- Topic: Quantum World Topics
- Replies: 3
- Views: 164
Re: Quantum World Topics
I would use Khan Academy and Crash Course/ look up other videos on YouTube in order to solidify my understanding in the topic.
- Sat Oct 06, 2018 11:41 pm
- Forum: General Science Questions
- Topic: Rusty on High School Chem [ENDORSED]
- Replies: 347
- Views: 444472
Re: Rusty on High School Chem [ENDORSED]
Last time I took chemistry was junior year as well, and it was honors chemistry, not AP. It is hard to try and refresh all the skills but the online modules have been very helpful to jog your memory on basic chemistry skills. I would also recommend going to the step by step hours or the workshops th...
- Sat Oct 06, 2018 11:37 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Molar Masses
- Replies: 9
- Views: 602
Re: Molar Masses
You do not need to know the molar mass of each element as every element has their mass listed under the symbol on the periodic table. Every test and quiz we will be given a periodic table.
- Fri Oct 05, 2018 12:07 am
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: diatomic elements
- Replies: 12
- Views: 9940
Re: diatomic elements
All the elements in the acronym HOFBrINCl, (hydrogen, oxygen, fluorine, Bromine, Iodine, and chlorine) are included in the diatomic elements. Any time these elements are listed in a chemical equation they must have the subscript of 2 as you always assume they are diatomic.