Search found 104 matches
- Tue Mar 17, 2020 7:20 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Ecell vs Eocell
- Replies: 7
- Views: 520
Re: Ecell vs Eocell
I agree the only difference is that Ecell does not require standard conditions like Excel.
- Tue Mar 17, 2020 7:18 pm
- Forum: General Science Questions
- Topic: Final chem
- Replies: 3
- Views: 331
Re: Final chem
We should be given results back by the end of this week. It should come pretty soon since it was taken online.
- Tue Mar 17, 2020 7:16 pm
- Forum: Student Social/Study Group
- Topic: Class Grading
- Replies: 44
- Views: 3515
Re: Class Grading
I agree, you will get a C- if you get at least 250 points.
- Tue Mar 17, 2020 7:12 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Grades
- Replies: 6
- Views: 603
Re: Final Grades
Yes, I agree that it will be soon since the final was taken online.
- Tue Mar 17, 2020 7:11 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Grading
- Replies: 3
- Views: 337
Re: Grading
I think each person will get the grade they deserve.
- Sun Mar 08, 2020 10:05 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Cell Diagram
- Replies: 21
- Views: 1115
Re: Cell Diagram
If cell potential is not given, the oxidation half-reaction should be on the left/anode, while the reduction half-reaction should be on the right/cathode. You should look at how electrons are transferred to verify though.
- Sun Mar 08, 2020 10:02 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Platinum
- Replies: 10
- Views: 615
Re: Platinum
You add platnium, or another solid metal conductor, whenever there is no solid on either side of the cell diagram.
- Sun Mar 08, 2020 9:59 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Exam Material Distribution
- Replies: 6
- Views: 391
Re: Final Exam Material Distribution
Yes, it should be evenly distributed. However, there is a possibility specific topics will be emphasized like in the midterm.
- Sun Mar 08, 2020 9:57 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 2 Grades
- Replies: 22
- Views: 1150
Re: Test 2 Grades
Yes, test 1 will probably be handed back in discussion.
- Sun Mar 08, 2020 9:57 pm
- Forum: Administrative Questions and Class Announcements
- Topic: 100 or 50 posts?
- Replies: 8
- Views: 576
Re: 100 or 50 posts?
I believe leaving all 100 posts is fine, too.
- Sun Mar 01, 2020 10:41 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Degree symbol
- Replies: 10
- Views: 954
Re: Degree symbol
The degree symbol indicates the reaction is at standard conditions (298 K, 1 atm)
- Sun Mar 01, 2020 10:39 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cathode/Right & Anode/Left
- Replies: 7
- Views: 991
Re: Cathode/Right & Anode/Left
Generally, yes, the cathode is usually on the right and the anode is usually on the left. However, if you want to make sure, the cathode is always the reduction while the anode is always the oxidation. You determine which solution is reduced and oxidized by looking at the transfer of electrons in th...
- Sun Mar 01, 2020 10:34 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: salt bridge
- Replies: 9
- Views: 573
Re: salt bridge
A salt bridge prevents ion buildup and helps the electrons transfer from the anode to cathode.
- Sun Mar 01, 2020 10:32 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: when to use K or Q
- Replies: 18
- Views: 1058
Re: when to use K or Q
K is used when the situation concerns the reaction at equilibrium; Q is used when the situation concerns the reaction at any point besides equilibrium
- Sun Mar 01, 2020 10:11 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: test 2 topics
- Replies: 11
- Views: 711
Re: test 2 topics
the second page of thermochemistry and all of electrochemistry
- Sun Feb 23, 2020 7:27 pm
- Forum: Balancing Redox Reactions
- Topic: Half Reactions
- Replies: 12
- Views: 818
Re: Half Reactions
There are two half reactions in a redox reaction. Oxidation is the half reaction involving a loss of electrons; reduction is the half reaction involving a gain of electrons.
- Sun Feb 23, 2020 7:26 pm
- Forum: Balancing Redox Reactions
- Topic: spontaneous
- Replies: 15
- Views: 757
Re: spontaneous
positive standard reduction potential --> spontaneous reduction
- Sun Feb 23, 2020 7:24 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: chemistry community posts
- Replies: 12
- Views: 596
Re: chemistry community posts
The weekly posts are due Sunday 11:59 PM.
- Sun Feb 23, 2020 7:22 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing Redox EQs
- Replies: 10
- Views: 626
Re: Balancing Redox EQs
If it is an acidic solution, you add H+; if it is a basic solution, you add OH-.
- Sun Feb 23, 2020 7:20 pm
- Forum: Balancing Redox Reactions
- Topic: Half reactions
- Replies: 7
- Views: 481
Re: Half reactions
Half reactions are the two reactions involved in a redox reaction, oxidation and reduction. Oxidation is the reaction involving a loss of electrons; reduction is the reaction involving a gain of electrons.
- Sun Feb 16, 2020 9:18 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Delta S
- Replies: 8
- Views: 632
Re: Delta S
Delta S - regular delta S, usually concerns the system of the reaction
Delta S (surroundings) - usually equals negative delta S (system)
Delta S (total) - equals delta (system) + delta (surroundings)
Delta S (surroundings) - usually equals negative delta S (system)
Delta S (total) - equals delta (system) + delta (surroundings)
- Sun Feb 16, 2020 9:12 pm
- Forum: Balancing Redox Reactions
- Topic: Seperating Redoz RXNS
- Replies: 7
- Views: 352
Re: Seperating Redoz RXNS
Half reactions just show the transfer of electrons in oxidation and reduction. Two half reactions, or an oxidation coupled with a reduction, equals the full reaction.
- Sun Feb 16, 2020 9:10 pm
- Forum: Balancing Redox Reactions
- Topic: Electrochemisty
- Replies: 10
- Views: 618
Re: Electrochemisty
Electrochemistry is the study of electricity and how it relates to chemical reactions. In electrochemistry, electricity can be generated by movements of electrons from one element to another in redox reactions.
- Sun Feb 16, 2020 9:08 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: reaction entropy
- Replies: 7
- Views: 571
Re: reaction entropy
You can use the equation ΔS° = ΣS°(products) - ΣS°(reactants) to solve for entropy of a reaction since entropy is a state function.
- Sun Feb 16, 2020 9:05 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Isochoric
- Replies: 8
- Views: 564
Re: Isochoric
An isochroric process is one where volume stays the same.
- Sun Feb 16, 2020 9:03 pm
- Forum: Balancing Redox Reactions
- Topic: Redox Reactions
- Replies: 12
- Views: 532
Re: Redox Reactions
A redox reaction is a reaction where both reduction and oxidation occur, also known as two half reactions. Oxidation involves the loss of electrons, whereas reduction involves gaining electrons.
- Sun Feb 09, 2020 10:40 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Gas v Liquids
- Replies: 4
- Views: 209
Re: Gas v Liquids
S(gas) >> S(liquids) > S(solids)
- Sun Feb 09, 2020 10:40 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: q rev
- Replies: 9
- Views: 293
Re: q rev
q is heat while rev refers to a reversible reaction so q rev is used for calculating heat for a reversible reaction.
- Sun Feb 09, 2020 10:38 pm
- Forum: Administrative Questions and Class Announcements
- Topic: midterm format
- Replies: 8
- Views: 372
Re: midterm format
Based on past Lavelle midterms and finals, it will most likely be around 8 free response questions with each question having multiple parts to it.
- Sun Feb 09, 2020 10:36 pm
- Forum: Student Social/Study Group
- Topic: Midterm Topics
- Replies: 12
- Views: 680
Re: Midterm Topics
The midterm will cover up to outline 4: Focus 4F-J. This means 5G.3, 5G.4, and 5J.3, are not on the exam.
- Sun Feb 09, 2020 10:35 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm dates
- Replies: 11
- Views: 475
Re: Midterm dates
The midterm will cover up to Focus 4F-J.
- Sun Feb 02, 2020 10:49 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Spontaneous
- Replies: 4
- Views: 202
Re: Spontaneous
Spontaneous, or favorable, reactions favor the formation of products over reactants and have a negative value in delta G. A reaction's overall entropy, or disorder, also increases.
- Sun Feb 02, 2020 10:44 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Reaction constant P
- Replies: 3
- Views: 81
Re: Reaction constant P
It is negligible for solids and liquids because they maintain a constant volume.
- Sun Feb 02, 2020 10:31 pm
- Forum: Calculating Work of Expansion
- Topic: Force
- Replies: 3
- Views: 147
Re: Force
Force is (pressure x area). You can derive this from the equation, P = F/A.
- Sun Feb 02, 2020 10:29 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: q vs H
- Replies: 9
- Views: 455
Re: q vs H
This is referring to q.
- Sun Feb 02, 2020 10:24 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Test 1
- Replies: 3
- Views: 212
Re: Test 1
I also received mine back during Week 4's discussion section.
- Sun Jan 26, 2020 10:00 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Partial Pressure vs Pressure
- Replies: 7
- Views: 218
Re: Partial Pressure vs Pressure
Partial pressure is the pressure of one gas but pressure is the pressure of the whole system. All the partial pressures added together equals pressure.
- Sun Jan 26, 2020 9:57 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Gas Constant
- Replies: 13
- Views: 518
Re: Gas Constant
The value for the gas constant depends on the units used in the specific question.
- Sun Jan 26, 2020 9:56 pm
- Forum: Ideal Gases
- Topic: Determining N
- Replies: 9
- Views: 376
Re: Determining N
You should only use it for calculating the moles of gases.
- Sun Jan 26, 2020 9:54 pm
- Forum: Ideal Gases
- Topic: R Constant
- Replies: 18
- Views: 1038
Re: R Constant
The R constant is the gas constant. Its value is determined by the units in the specific problem.
- Sun Jan 26, 2020 9:51 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Midterm
- Replies: 8
- Views: 310
Re: Midterm
Yes, it is Week 6.
- Sun Jan 19, 2020 9:56 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: H20 in the ICE table
- Replies: 26
- Views: 1399
Re: H20 in the ICE table
Yes H2O is not included in the ICE tables along with solids and liquids.
- Sun Jan 19, 2020 9:55 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Not including solids and liquids
- Replies: 7
- Views: 272
Re: Not including solids and liquids
Solids and liquids equal 1 so they are neglected when calculating K.
- Sun Jan 19, 2020 9:54 pm
- Forum: Ideal Gases
- Topic: Kp given instead of Kc
- Replies: 8
- Views: 449
Re: Kp given instead of Kc
Use PV=nRT to convert moles to pressure. Moles is represented by n and pressure is represented by P.
- Sun Jan 19, 2020 9:51 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K vs Q
- Replies: 14
- Views: 315
Re: K vs Q
K is used when a reaction is at equilibrium while Q is used when a reaction is at any point.
- Sun Jan 19, 2020 9:49 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Relationship between pressure and volume
- Replies: 10
- Views: 389
Re: Relationship between pressure and volume
I agree that PV=nRT proves that pressure and volume have an inverse relationship.
- Sun Jan 12, 2020 5:30 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Reaction shifts right or left?
- Replies: 14
- Views: 1494
Re: Reaction shifts right or left?
If a reaction shifts to the right, then the forward reaction is favored and more products will be produced.
If a reaction shifts to the left, then the reverse reaction is favored and more reactants will be produced.
If a reaction shifts to the left, then the reverse reaction is favored and more reactants will be produced.
- Sun Jan 12, 2020 5:28 pm
- Forum: Ideal Gases
- Topic: Topics on Test 1
- Replies: 37
- Views: 1247
Re: Topics on Test 1
It will definitely consist of Outline 1 and possibly outline 2 considering tests will begin week 3.
- Sun Jan 12, 2020 5:26 pm
- Forum: Ideal Gases
- Topic: Kc vs Kp
- Replies: 5
- Views: 272
Re: Kc vs Kp
Kc is defined by molar concentrations while Kp is defined by the partial pressures of the gasses.
- Sun Jan 12, 2020 5:24 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Reaction Q
- Replies: 7
- Views: 366
Re: Reaction Q
Q determines which direction a reaction will proceed at any time during the reaction. If Q < K at some time during the reaction, then there are more reactants than products and the forward reaction is favored. If Q > K at some time during the reaction, then there are more products than reactants and...
- Sun Jan 12, 2020 5:21 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Different types of K
- Replies: 9
- Views: 256
Re: Different types of K
K is the equilibrium constant.
Kc is defined by molar concentrations while Kp is defined by the partial pressures of the gasses.
Kc is defined by molar concentrations while Kp is defined by the partial pressures of the gasses.
- Sun Dec 08, 2019 5:42 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: LDF
- Replies: 4
- Views: 449
Re: LDF
Yes, all molecules have LDF. Dipole-induced dipole occurs between an ion and non-polar molecule.
- Sun Dec 08, 2019 5:36 pm
- Forum: DeBroglie Equation
- Topic: deBroglie derived
- Replies: 2
- Views: 362
Re: deBroglie derived
De Brogile's equation says that any moving particle with momentum, p, has wavelike properties with wavelength, λ. (λ=h/p --> λ=h/mv)
- Sun Dec 08, 2019 5:33 pm
- Forum: Naming
- Topic: NH4[PtCl3(NH3)]
- Replies: 6
- Views: 832
Re: NH4[PtCl3(NH3)]
The ending of a metal's name always changes to -ate when it the compound is anionic, or has a negative charge.
- Sun Dec 08, 2019 5:28 pm
- Forum: Dipole Moments
- Topic: dipole dipole
- Replies: 5
- Views: 393
Re: dipole dipole
Yes, hydrogen bonds are stronger than dipole-dipole bonds.
- Sun Dec 08, 2019 5:27 pm
- Forum: Dipole Moments
- Topic: Hydrogen bonds
- Replies: 9
- Views: 558
Re: Hydrogen bonds
A hydrogen bond is any bond between H and F, O, or N. You can count the hydrogen bonding sites for these.
- Sun Dec 01, 2019 9:10 pm
- Forum: Bond Lengths & Energies
- Topic: Hydrogen Bonding
- Replies: 13
- Views: 1023
Re: Hydrogen Bonding
Hydrogen bondings occurs when H bonds to either F, O, or N.
- Sun Dec 01, 2019 9:06 pm
- Forum: Bronsted Acids & Bases
- Topic: Correct equation for 6A.3?
- Replies: 4
- Views: 259
Re: Correct equation for 6A.3?
I also got the same equations!
- Sun Dec 01, 2019 9:03 pm
- Forum: Student Social/Study Group
- Topic: Final Studying
- Replies: 8
- Views: 339
Re: Final Studying
I suggest attending the review sessions and doing the practice problems.
- Sun Dec 01, 2019 9:02 pm
- Forum: Hybridization
- Topic: Order When Writing
- Replies: 5
- Views: 278
Re: Order When Writing
I agree that both are correct the preferred way is to write it beginning with d.
- Sun Dec 01, 2019 9:01 pm
- Forum: Naming
- Topic: Naming of coordination compounds
- Replies: 5
- Views: 423
Re: Naming of coordination compounds
Yes, I believe we will be given the formula first.
- Sun Dec 01, 2019 8:56 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Final Study Methods
- Replies: 11
- Views: 647
Re: Final Study Methods
You should plan to study consistently from this point until the day of the final. You should attend the upcoming review sessions and workshops, review notes, and do the practice problems.
- Sun Nov 24, 2019 6:00 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 2.57
- Replies: 1
- Views: 95
Re: 2.57
There is a different shape when referring to each central atom.
- Sun Nov 24, 2019 5:56 pm
- Forum: Bronsted Acids & Bases
- Topic: Weak vs Strong Acids
- Replies: 3
- Views: 253
Re: Weak vs Strong Acids
I agree that the strength of an acid is usually determined by its pH or H+.
- Sun Nov 24, 2019 5:54 pm
- Forum: Sigma & Pi Bonds
- Topic: Visualizing this
- Replies: 4
- Views: 389
Re: Visualizing this
We should visualize sigma bonds as the head-to-head overlap of two sp2 orbitals and pi bonds as the side-to-side overlap of two 2p orbitals.
- Sun Nov 24, 2019 5:49 pm
- Forum: Hybridization
- Topic: How does hybridization happen?
- Replies: 3
- Views: 257
Re: How does hybridization happen?
Hybridization happens when an atom bonds using electrons from both the s and p orbitals, creating an imbalance in the energy levels of the electrons. To equalize these energy levels, the s and p orbitals involved between the two atoms are combined to create hybrid orbitals.
- Sun Nov 24, 2019 5:43 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Use of Bronsted or Lewis Definitions
- Replies: 7
- Views: 331
Re: Use of Bronsted or Lewis Definitions
Either definition should be fine.
- Sun Nov 17, 2019 8:03 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: HW# 2E.26
- Replies: 2
- Views: 85
Re: HW# 2E.26
Yes, I agree that the symmetry of a lewis structure can sometimes help in determining polarity, but the most accurate way would be to evaluate electronegativity differences.
- Sun Nov 17, 2019 7:54 pm
- Forum: Ionic & Covalent Bonds
- Topic: Hydrogen Bonds
- Replies: 6
- Views: 368
Re: Hydrogen Bonds
N, O, or F can form a hydrogen bond with H.
- Sun Nov 17, 2019 7:51 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Length
- Replies: 22
- Views: 1222
Re: Bond Length
Bond length is determined by the bond order, or the number of bonded electrons. This has to be derived from experiments.
- Sun Nov 17, 2019 7:49 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 2E.29
- Replies: 2
- Views: 181
Re: 2E.29
(a) Of the three forms, 1 and 2 are polar. (b) The largest dipole moment occurs in 1.
- Sun Nov 17, 2019 7:49 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 2E.29
- Replies: 2
- Views: 181
Re: 2E.29
(a) Of the three forms, 1 and 2 are polar. (b) The largest dipole moment occurs in 1.
- Sun Nov 17, 2019 7:42 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 2F.7
- Replies: 1
- Views: 150
Re: 2F.7
(a) sp^3 (b) sp^3d^2 (c) sp^3d (d) sp^3
- Sun Nov 10, 2019 10:45 pm
- Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
- Topic: Viscosity
- Replies: 25
- Views: 3151
Re: Viscosity
When a liquid has high viscosity, it means there is a lot of friction between the adjacent layers of a liquid. This will make the liquid flow slowly.
- Sun Nov 10, 2019 10:43 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge and Resonance
- Replies: 5
- Views: 382
Re: Formal Charge and Resonance
Not really, you should pay attention to the kind of bonds in a compounds in a lewis structure. If there are more than one kind, it should have resonance structures.
- Sun Nov 10, 2019 10:37 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Oxidation Number
- Replies: 6
- Views: 377
Re: Oxidation Number
An oxidation number is the charge that atom would have if it was made up of ions.
- Sun Nov 10, 2019 9:33 pm
- Forum: Dipole Moments
- Topic: Hydrogen Bonds
- Replies: 4
- Views: 200
Re: Hydrogen Bonds
F, O, N can form a hydrogen bond with H.
- Sun Nov 10, 2019 9:33 pm
- Forum: Sigma & Pi Bonds
- Topic: Sigma vs pi bond
- Replies: 3
- Views: 168
Re: Sigma vs pi bond
Sigma bonds are formed by end-to-end overlapping of atomic orbitals; pi bonds are formed when the lobe of one atomic orbital overlaps another.
- Sun Nov 03, 2019 9:19 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: L quantum number
- Replies: 5
- Views: 377
Re: L quantum number
When n = 12, l = 0-11 (12 values).
- Sun Nov 03, 2019 9:03 pm
- Forum: Resonance Structures
- Topic: Showing resonance
- Replies: 8
- Views: 344
Re: Showing resonance
Yes, you can use the double arrows to draw a lewis structure's resonance structures.
- Sun Nov 03, 2019 9:03 pm
- Forum: Electronegativity
- Topic: Defining electronegativity
- Replies: 6
- Views: 748
Re: Defining electronegativity
Electronegativity is the tendency of an atom to attract a bonding pair of electrons.
- Sun Nov 03, 2019 8:55 pm
- Forum: Empirical & Molecular Formulas
- Topic: Rounding
- Replies: 6
- Views: 610
Re: Rounding
You should only round to a whole number when the decimal is extremely close to a whole number. For example, 1.96 to 1.99 can be rounded to 2. However, 1.6 or 1.8 should be multiplied to a whole number.
- Sun Nov 03, 2019 8:50 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 4s or 3d first?
- Replies: 14
- Views: 787
Re: 4s or 3d first?
The 4s orbitals have a lower energy than the 3d orbitals, so the 4s orbitals are filled first. However, Lavelle has said to write 3d first.
- Sat Oct 26, 2019 8:01 pm
- Forum: Lewis Structures
- Topic: Anion
- Replies: 7
- Views: 383
Re: Anion
First, add the negative charge to the total number of electrons in order to know how many electrons to represent in the Lewis structure. Second, you can draw brackets around the Lewis structure and write the negative charge besides the top right corner.
- Sat Oct 26, 2019 7:52 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionization Energy
- Replies: 5
- Views: 170
Re: Ionization Energy
No it technically does both because diagonally down is basically straight down and to the left.
- Sat Oct 26, 2019 7:36 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 7
- Views: 417
Re: Formal Charge
The resonance structure with the lowest formal change is the most stable.
- Sat Oct 26, 2019 7:16 pm
- Forum: Trends in The Periodic Table
- Topic: Trends
- Replies: 5
- Views: 153
Re: Trends
You should be familiar with atomic radius, ionization energy, electron affinity, and electronegativity.
- Sat Oct 26, 2019 5:59 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization energy
- Replies: 12
- Views: 558
Re: Ionization energy
You should understand the trends of ionization energy. It increases going across a period and up a group.
- Sun Oct 20, 2019 7:19 pm
- Forum: Properties of Light
- Topic: Next test
- Replies: 23
- Views: 1030
Re: Next test
The same equation sheet used for test 1 will be used for future tests/midterms/finals.
- Sun Oct 20, 2019 7:12 pm
- Forum: Properties of Electrons
- Topic: Mass of an Electron
- Replies: 14
- Views: 484
Re: Mass of an Electron
This is a set mass which will also be given as a constant on the test.
- Sun Oct 20, 2019 7:10 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configuration
- Replies: 5
- Views: 212
Re: Electron Configuration
The order of filling orbitals is: 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^2, 3d^10, 4p^6, and so on.
- Sun Oct 20, 2019 7:07 pm
- Forum: Properties of Light
- Topic: Unit for Wavelength
- Replies: 34
- Views: 2297
Re: Unit for Wavelength
The standard unit for wavelength is meters (m) but it can be converted from nanometers, centimeters, etc.
- Sun Oct 20, 2019 7:06 pm
- Forum: Properties of Light
- Topic: Question 1A.3
- Replies: 3
- Views: 149
Re: Question 1A.3
The answer is c) The extent of the change in the electrical field at a given point decreases. The electrical field corresponds to the amplitude; as the frequency decreases the waves broaden and the extent of the change decreases.
- Sun Oct 20, 2019 7:02 pm
- Forum: Photoelectric Effect
- Topic: Speed of Light
- Replies: 29
- Views: 1465
Re: Speed of Light
Yes, the speed of light is always going to be 2.998 x 10^8 m/s. It is always going to be a constant too. Sometimes, it is rounded to 3.00 x 10^8 m/s; however, using 2.998 x 10^8 m/s is recommended for accuracy.
- Sun Oct 13, 2019 9:46 pm
- Forum: Properties of Light
- Topic: Week 3 Homework Topics
- Replies: 2
- Views: 77
Re: Week 3 Homework Topics
Yes, Lavelle said week 3 homework can be on the quantum unit.
- Sun Oct 13, 2019 9:44 pm
- Forum: Significant Figures
- Topic: How Many Sig Figs
- Replies: 7
- Views: 394
Re: How Many Sig Figs
You should follow the standard sig fig rules for multiplication/division and addition/subtraction. For addition/subtraction, the number of sig figs should match the smallest amount of decimals in a given value. For multiplication/division, the number of sig figs should match the smallest amount of s...
- Sun Oct 13, 2019 9:41 pm
- Forum: Properties of Light
- Topic: Speed of light.
- Replies: 10
- Views: 270
Re: Speed of light.
Yes, we will consider the speed of light as a constant that can be expressed as 3.00 x 10^8 m/s^-1.
- Sun Oct 13, 2019 9:18 pm
- Forum: Administrative Questions and Class Announcements
- Topic: When do we need our 5 posts done by?
- Replies: 4
- Views: 235
Re: When do we need our 5 posts done by?
I also support the above post that our 5 posts are due at Sunday 11:19 PM.
- Sun Oct 13, 2019 9:14 pm
- Forum: Limiting Reactant Calculations
- Topic: How to find Excess Reactant?
- Replies: 5
- Views: 3398
Re: How to find Excess Reactant?
To find the amount of excess reactant remaining, subtract the mass of excess reagent consumed from the mass of excess reagent given.
- Thu Oct 03, 2019 11:29 pm
- Forum: SI Units, Unit Conversions
- Topic: When to use what units
- Replies: 5
- Views: 322
Re: When to use what units
You should convert to moles and liters, as those are the standard units.