The reaction graph helps a lot!
Hope this helps!
Search found 111 matches
- Sat Mar 13, 2021 5:15 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Sapling HW Week 9/10 #17
- Replies: 9
- Views: 517
- Sat Mar 13, 2021 5:13 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: delta s=(qrev)/T
- Replies: 4
- Views: 542
Re: delta s=(qrev)/T
The rev means that only the heat of a reversible reaction can be used in this equation when calculating delta S, the entropy change.
Hope this helps!
Hope this helps!
- Sat Mar 13, 2021 5:12 pm
- Forum: General Rate Laws
- Topic: Determining Intermediate Concentrations
- Replies: 6
- Views: 486
Re: Determining Intermediate Concentrations
If the compound is an intermediate, it cannot be in the rate law.
Hope this helps!
Hope this helps!
- Sat Mar 13, 2021 5:11 pm
- Forum: General Rate Laws
- Topic: Determining Intermediate Concentrations
- Replies: 6
- Views: 486
Re: Determining Intermediate Concentrations
If the compound is both a reactant and product in the individual steps of the reaction mechanism, it is an intermediate.
Hope this helps!
Hope this helps!
- Sat Mar 13, 2021 5:08 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Bomb Calorimeter
- Replies: 14
- Views: 4803
Re: Bomb Calorimeter
A bomb calorimeter is the best simulation of a perfect system.
Hope this helps!
Hope this helps!
- Sat Mar 13, 2021 5:07 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: "Thermodynamically Stable" vs "Kinetically Stable"
- Replies: 10
- Views: 1777
Re: "Thermodynamically Stable" vs "Kinetically Stable"
Kinetically stable substances cannot overcome the activation energy and cannot react.
Hope this helps!
Hope this helps!
- Sat Mar 13, 2021 5:06 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: "Thermodynamically Stable" vs "Kinetically Stable"
- Replies: 10
- Views: 1777
Re: "Thermodynamically Stable" vs "Kinetically Stable"
If delta G is negative, then the reaction is thermodynamically unstable.
Hope this helps!
Hope this helps!
- Sat Mar 13, 2021 5:02 pm
- Forum: General Rate Laws
- Topic: sapling week 10 #13
- Replies: 7
- Views: 514
Re: sapling week 10 #13
HClO is an intermediate reactant, so you can't have it in the rate law.
Hope this helps!
Hope this helps!
- Sat Mar 13, 2021 5:00 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6.43 part B
- Replies: 1
- Views: 161
Re: 6.43 part B
That's a weird textbook question, but I think it's talking about temperature dependence in two ways. For Enaught, it's saying that it is only true at one temperature (STP), while for E, it's saying that it can change based on the temperature.
Hope this helps!
Hope this helps!
- Sat Mar 13, 2021 4:59 pm
- Forum: General Rate Laws
- Topic: Units for k
- Replies: 11
- Views: 781
Re: Units for k
You can either memorize or just mathematically calculate the units too!
Hope this helps!
Hope this helps!
- Sat Mar 13, 2021 4:57 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Bomb Calorimeter
- Replies: 14
- Views: 4803
Re: Bomb Calorimeter
A bomb calorimeter is an isolated system that cannot exchange matter or thermal energy with its surroundings!
Hope this helps!
Hope this helps!
- Sat Mar 13, 2021 4:56 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Inert electrode
- Replies: 3
- Views: 281
Re: Inert electrode
I don't think either one is more preferred than the other!
Hope this helps!
Hope this helps!
- Sat Mar 13, 2021 4:55 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Anode and Cathode
- Replies: 25
- Views: 1387
Re: Anode and Cathode
Yes! The anode is always oxidized, and the cathode is always reduced!
Hope this helps!
Hope this helps!
- Sat Mar 13, 2021 4:53 pm
- Forum: General Rate Laws
- Topic: Rate determining step
- Replies: 38
- Views: 1600
Re: Rate determining step
Also, don't forget to cancel out intermediates by substituting equivalents reactants and products!
Hope this helps!
Hope this helps!
- Sat Mar 13, 2021 4:52 pm
- Forum: General Rate Laws
- Topic: Rate determining step
- Replies: 38
- Views: 1600
Re: Rate determining step
The slow step is rate-determining because it's like assembling a computer. If you need one screen and 40 keys for the keyboard, if the slowest step is producing the 40 keys for the keyboard, then that's as fast you can make computers.
Hope this helps!
Hope this helps!
- Sat Mar 13, 2021 4:50 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Changing k
- Replies: 3
- Views: 303
Re: Changing k
I don't think there are any other ways to impact the rate constant!
Hope this helps!
Hope this helps!
- Sat Mar 13, 2021 4:46 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagrams
- Replies: 2
- Views: 227
Re: Cell Diagrams
I second what the person above me said. And yes, stoichiometric coefficients are tempting to include in electromotive force calculations!
Hope this helps!
Hope this helps!
- Sat Mar 13, 2021 4:41 pm
- Forum: General Rate Laws
- Topic: Pseudo Rates
- Replies: 8
- Views: 748
Re: Pseudo Rates
The pseudo rate constant makes it easier to determine a rate constant or reaction rate, since one concentration changes so little that it is negligible.
Hope this helps!
Hope this helps!
- Sat Mar 13, 2021 4:40 pm
- Forum: General Rate Laws
- Topic: Units for k
- Replies: 11
- Views: 781
Re: Units for k
Units for the rate constant should cancel with the units of molarity, so that the rate constant is in molar per second.
Hope this helps!
Hope this helps!
- Sat Mar 13, 2021 4:38 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: H+ and Pt in Cell Diagrams
- Replies: 3
- Views: 317
Re: H+ and Pt in Cell Diagrams
Platinum is the electrode when there is no metallic electrode present to conduct the electric current.
Hope this helps!
Hope this helps!
- Sat Mar 13, 2021 4:37 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Identifying Weak Acids and Bases
- Replies: 5
- Views: 421
Re: Identifying Weak Acids and Bases
For strong acids, it's easiest to memorize the few strong acids, and assume all other acids are weak.
Hope this helps!
Hope this helps!
- Sat Mar 13, 2021 4:35 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: About k
- Replies: 26
- Views: 2983
Re: About k
Be careful about the difference between k and K though.
Hope this helps!
Hope this helps!
- Sat Mar 13, 2021 4:35 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: About k
- Replies: 26
- Views: 2983
Re: About k
If K is a large value, then products are favored.
Hope this helps!
Hope this helps!
- Sat Mar 13, 2021 4:33 pm
- Forum: Student Social/Study Group
- Topic: Left/Right Electrode
- Replies: 9
- Views: 676
Re: Left/Right Electrode
The half-reaction that has a lower standard reduction potential will be oxidation, so that one should be on the left. The higher standard reduction reaction should be on the right, since it is reduction.
Hope this helps!
Hope this helps!
- Sat Mar 13, 2021 4:31 pm
- Forum: Second Order Reactions
- Topic: Textbook Problem 7B.13
- Replies: 3
- Views: 503
Re: Textbook Problem 7B.13
For a and b, you can simply use the fact that they are exponentials of the half life, which is 1/2 of the value of the initial concentration. So 1/16 would be (1/2)^4. So multiply the half-life in seconds by 4.
Hope this helps!
Hope this helps!
- Sat Mar 13, 2021 4:29 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Lecture example?
- Replies: 5
- Views: 426
Re: Lecture example?
Yep that answer is correct!
- Sat Mar 13, 2021 4:28 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Sapling 17
- Replies: 7
- Views: 663
Re: Sapling 17
It is really helpful to look at the reaction enthalpy graph. The activation energy is the height of the mountain, and the change in enthalpy is the difference between the starting and final enthalpy.
- Thu Mar 11, 2021 9:18 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Equations and Derivations/Integrations
- Replies: 4
- Views: 344
Re: Equations and Derivations/Integrations
Just remember what you're asked for, and in what units.
Hope this helps!
Hope this helps!
- Thu Mar 11, 2021 9:17 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: R constant
- Replies: 6
- Views: 511
Re: R constant
Usually, look for whetehr Joules are used in the question, and that would mean that you would use 8.314 J/(K x mol.)
- Thu Mar 11, 2021 9:16 pm
- Forum: Calculating Work of Expansion
- Topic: W= -PDeltaV
- Replies: 15
- Views: 1944
Re: W= -PDeltaV
This equation is for irreversible expansions only, which occurs at constant pressure.
- Thu Mar 11, 2021 9:15 pm
- Forum: General Rate Laws
- Topic: Determining Intermediate Concentrations
- Replies: 6
- Views: 486
Re: Determining Intermediate Concentrations
Usually, the rate law given would not match the elementary reaction, and this would indicate the presence of intermediate.
- Tue Mar 02, 2021 3:06 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: average rate
- Replies: 11
- Views: 644
Re: average rate
It’s always positive, since if the reaction begins with only reactions, this is the only direction the reaction can go in.
- Sun Feb 07, 2021 12:39 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: constant pressure in open beaker
- Replies: 8
- Views: 409
Re: constant pressure in open beaker
yes, the universe has such a massive volume that the change is negligible.
- Sun Feb 07, 2021 12:38 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Strong vs Weak acid/Bases
- Replies: 10
- Views: 547
Re: Strong vs Weak acid/Bases
When you hear weak something, think of an ICE table.
- Sun Feb 07, 2021 12:37 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Strong vs Weak acid/Bases
- Replies: 10
- Views: 547
Re: Strong vs Weak acid/Bases
Weak acids and bases do not completely dissociate, and ICE tables allow us to quantify just how much they do dissociate. Strong acids and bases dissociate completely, so while you could technically use an ICE table for them, it's not necessary and is overly tedious.
- Sun Feb 07, 2021 12:36 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Sapling 20
- Replies: 10
- Views: 478
Re: Sapling 20
I agree, use q=mcdeltaT.
- Sun Feb 07, 2021 12:34 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Positive and Negative q Value
- Replies: 19
- Views: 13463
Re: Positive and Negative q Value
Work done by the system is exothermic, while work done ON the system is endothermic, from the system's perspective.
- Sun Feb 07, 2021 12:31 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Positive and Negative q Value
- Replies: 19
- Views: 13463
Re: Positive and Negative q Value
Negative means exothermic, positive means endothermic.
- Sun Feb 07, 2021 12:31 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Definition of an Inert Gas
- Replies: 15
- Views: 1032
Re: Definition of an Inert Gas
An inert gas is a member of the noble gases.
- Sun Feb 07, 2021 12:29 pm
- Forum: Ideal Gases
- Topic: Kc vs. Kp
- Replies: 71
- Views: 2769
Re: Kc vs. Kp
for Kc or Kp, the values should all be concentrations or partial pressures, respectively.
- Fri Feb 05, 2021 11:37 am
- Forum: Ideal Gases
- Topic: Gas Constant Value
- Replies: 43
- Views: 1753
Re: Gas Constant Value
Based on the units, goose the appropriate gas constant-value.
- Fri Feb 05, 2021 11:35 am
- Forum: Phase Changes & Related Calculations
- Topic: Reversible and Irreversible
- Replies: 6
- Views: 323
Re: Reversible and Irreversible
Also, reversible reactions can be reversed simply by undoing what was done to cause the initial change. So, like the other student’s example, if one pebble was removed to facilitate the change in equilibrium, one can simply put the pebble back to reverse the change in equilibrium.
- Thu Jan 28, 2021 12:29 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Sapling grading error
- Replies: 1
- Views: 97
Re: Sapling grading error
Also, my grade had been 5/5 as of yesterday, but it has since changed.
- Thu Jan 28, 2021 12:21 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Sapling grading error
- Replies: 1
- Views: 97
Sapling grading error
Hey everyone, I was wondering if anyone has the same issue with grading on the Week 1 sapling assignment? Mine says that I have completed the assignment and denotes a 100% at the top left, but has for some reason cleared my submission for one of the questions. Despite the 100% grade on sapling, on m...
- Wed Jan 20, 2021 10:33 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Ka correlation to strength of an acid
- Replies: 30
- Views: 2323
Re: Ka correlation to strength of an acid
The higher the Ka-value, the stronger the acid.
- Wed Jan 20, 2021 10:32 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: friday week 2 lecture question (approximation of weak acids)
- Replies: 5
- Views: 275
Re: friday week 2 lecture question (approximation of weak acids)
The change in concentration which is the value of x is so minuscule that it can be approximated.
- Wed Jan 20, 2021 10:27 am
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Calculating the pH and percentage deprotonation of a weak acid
- Replies: 8
- Views: 555
Re: Calculating the pH and percentage deprotonation of a weak acid
The K-value is less than 1.0 x 10^-3.
- Wed Jan 20, 2021 10:26 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Rounding E Values in ICE charts
- Replies: 17
- Views: 707
Re: Rounding E Values in ICE charts
If the K value is less than 1.0 x 10^-3, then the x can be dropped.
- Wed Jan 20, 2021 10:24 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: 4D.9
- Replies: 3
- Views: 161
Re: 4D.9
I also believe that density is just supposed to be positive, so the enthalpy would follow.
- Tue Jan 12, 2021 8:45 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Textbook Problem 5.61
- Replies: 2
- Views: 112
Textbook Problem 5.61
6CO2(g) + 6H2O(l) -> C6H12O6(aq) + 6O2(g)
The question asks what happens when you add water. The textbook answer is that nothing changes - can anyone explain this please? Thank you!
The question asks what happens when you add water. The textbook answer is that nothing changes - can anyone explain this please? Thank you!
- Tue Jan 12, 2021 9:13 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Calculating for [OH-] and [H3O+]
- Replies: 6
- Views: 546
Re: Calculating for [OH-] and [H3O+]
The ratio is always 1:1, so exponents are not needed in the Kw problems!
- Tue Jan 12, 2021 9:10 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K in relation to shifting right/left
- Replies: 8
- Views: 366
Re: K in relation to shifting right/left
Yep, that’s correct! That analysis works for all equilibrium reactions!
- Tue Jan 12, 2021 9:10 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Pure substances
- Replies: 9
- Views: 1211
Re: Pure substances
In equilibrium reactions, there’s so much of these pure substances that their concentration doesn’t really change.
- Tue Jan 12, 2021 9:08 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 6B Question #9
- Replies: 3
- Views: 122
Re: 6B Question #9
I think that’s a typo in the book, it’s impossible to get a positive pH if the H3O+ concentration is greater than 1.
- Tue Jan 12, 2021 9:05 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Neglecting Water
- Replies: 20
- Views: 1130
Re: Neglecting Water
The concentration of water is negligible because there’s so much of it. Picture it this way: there’s a sandbox filled with sand, and you drop a few marbles into it. The concentration of marbles has changed significantly, so it should be considered mathematically. The concentration of the sand really...
- Tue Jan 05, 2021 7:34 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Q vs K
- Replies: 12
- Views: 627
Re: Q vs K
Q is where the reaction is right now (not necessarily at equilibrium) whereas the K value is always the ratio of products divided by reactants at equilibrium. If Q is greater than K, than think of it like this: K is the ideal ratio, but since Q is to large, this means that there are to many products...
- Tue Jan 05, 2021 7:27 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Pure Substances Concentration
- Replies: 4
- Views: 264
Re: Pure Substances Concentration
The aqueous substances have significant and measurable changes in concentration, whereas the solvent water is present in such a high amount that the change is negligible.
- Tue Jan 05, 2021 7:26 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: temperature change in reactions
- Replies: 11
- Views: 430
Re: temperature change in reactions
Think of it like this: if a reaction is endothermic, meaning it absorbs energy (so energy is a reactant), the reaction shifts as follows: if the temperature increases, the reaction shifts away from the energy “reactant”, so it shifts towards the products and to the right. Vice versa if the temperatu...
- Tue Jan 05, 2021 7:23 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE Boxes
- Replies: 13
- Views: 553
Re: ICE Boxes
Another thing to notice is that if you begin a reaction with only products, then the reaction must proceed towards the reactants. So, the reactant(s) should get a +x.
- Tue Jan 05, 2021 7:22 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: H2O
- Replies: 44
- Views: 2126
Re: H2O
Pure substances and solvents are not included in ICE tables.
Hope this helps!
Hope this helps!
- Sun Dec 13, 2020 7:52 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligands
- Replies: 8
- Views: 465
Re: Ligands
A coordination compound can have several types of ligands.
- Sun Dec 13, 2020 7:52 am
- Forum: Naming
- Topic: Polydentate ligands
- Replies: 6
- Views: 661
Re: Polydentate ligands
Polydentate ligands can use several atoms to bond to a central transition metal atom.
- Sun Dec 13, 2020 7:48 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: polydentate ligands
- Replies: 5
- Views: 487
Re: polydentate ligands
I wouldn’t think it’s necessary to memorize en and dien.
- Sun Dec 13, 2020 7:47 am
- Forum: Bronsted Acids & Bases
- Topic: Sapling Week 10 #2
- Replies: 7
- Views: 583
Re: Sapling Week 10 #2
An amphoteric substance must be able to act as an acid and a base.
- Sun Dec 13, 2020 7:46 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: What are the bond angles for T shaped?
- Replies: 21
- Views: 8760
Re: What are the bond angles for T shaped?
90 degrees between the atoms.
- Sun Dec 06, 2020 8:36 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Negative pH of acid
- Replies: 16
- Views: 736
Re: Negative pH of acid
pH goes from 0-14.
- Sun Dec 06, 2020 8:35 pm
- Forum: Naming
- Topic: Number after Metal
- Replies: 9
- Views: 527
Re: Number after Metal
The Roman numeral is the oxidation state and the charge of the transition metal. This charge, when added to the charges of the ligands, should cancel out with the anionic charges, or make the entire molecule the correct charge.
- Sun Dec 06, 2020 8:34 pm
- Forum: Naming
- Topic: "(en)" Sapling
- Replies: 19
- Views: 972
Re: "(en)" Sapling
En is short for ethylenediamine, a bidentate molecule.
- Sun Dec 06, 2020 8:31 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: How to find coordination number.
- Replies: 10
- Views: 3602
Re: How to find coordination number.
The oxidation state of an ion is the charge of that ion. Hope this helps!
- Sun Dec 06, 2020 8:30 pm
- Forum: Naming
- Topic: Order of Ligands/naming
- Replies: 28
- Views: 1240
Re: Order of Ligands/naming
The ligands go in alphabetical order.
Re: Cl & Br3
Br3- is bromide.
- Tue Nov 24, 2020 8:09 pm
- Forum: Dipole Moments
- Topic: Polarity
- Replies: 30
- Views: 1496
Re: Polarity
Yes, the interaction of the polar bonds determines the polarity of the molecule. Hope this helps!
- Tue Nov 24, 2020 8:05 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Determining Molecular Polarity using VSEPR
- Replies: 8
- Views: 449
Re: Determining Molecular Polarity using VSEPR
In CO2, the dipoles are directly opposite of each, so they cancel out, so the molecule is nonpolar.
- Tue Nov 24, 2020 8:01 pm
- Forum: Hybridization
- Topic: d hybridized orbital confusion
- Replies: 7
- Views: 373
Re: d hybridized orbital confusion
Dr. Lavelle said either one is okay. Hope this helps!
- Tue Nov 24, 2020 8:00 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: regions of electron density
- Replies: 7
- Views: 605
Re: regions of electron density
Regardless of bond order, all covalent bond are one region of electron density. Lone pairs also count as regions of electron density.
- Tue Nov 24, 2020 7:57 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Shape Names
- Replies: 50
- Views: 2594
Re: Shape Names
That is a bent shape.
- Tue Nov 24, 2020 7:52 pm
- Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
- Topic: determining viscosity
- Replies: 11
- Views: 2652
Re: determining viscosit
This depends on the intermolecular forces or IMFs.
- Tue Nov 24, 2020 7:51 pm
- Forum: Hybridization
- Topic: Electron Configuration
- Replies: 7
- Views: 720
Re: Electron Configuration
Chromium and copper are the typical exceptions to the the general electron configuration rules.
- Tue Nov 24, 2020 7:50 pm
- Forum: Hybridization
- Topic: Sp3d or dsp3
- Replies: 22
- Views: 2230
Re: Sp3d or dsp3
Either sp3d or dsp3 is correct.
- Tue Nov 24, 2020 7:49 pm
- Forum: Dipole Moments
- Topic: Polarity from Shape
- Replies: 12
- Views: 737
Re: Polarity from Shape
In a bent molecule like water, the molecule is bent. So, the dipoles don’t cancel out, since the molecule is asymmetric. Hope this helps!
- Wed Nov 18, 2020 5:04 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Textbook 2A.11
- Replies: 3
- Views: 157
Textbook 2A.11
For this problem, it says to find the metal ion M3+ that has the ground-state electron configuration [Ar] 3d6. isn't it an oxymoron to discuss the ground-state electron configuration of an ion? According to the textbook answers, the element is Co3+, which implies that this answer choice is the confi...
- Thu Nov 12, 2020 2:47 pm
- Forum: Sigma & Pi Bonds
- Topic: Triple bond?
- Replies: 21
- Views: 911
Re: Triple bond?
A triple is one sigma and two pi bonds.
- Thu Nov 12, 2020 2:46 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge vs Octet Rule
- Replies: 12
- Views: 772
Re: Formal Charge vs Octet Rule
Octet rule comes first.
- Tue Nov 10, 2020 2:37 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Co+3 valence electrons
- Replies: 5
- Views: 640
Re: Co+3 valence electrons
Oh I see, thank you!
- Tue Nov 10, 2020 2:27 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Co+3 valence electrons
- Replies: 5
- Views: 640
Re: Co+3 valence electrons
I forgot to note that the textbook says the answer is 6 valence electrons.
- Tue Nov 10, 2020 2:11 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Co+3 valence electrons
- Replies: 5
- Views: 640
Co+3 valence electrons
So for the ion Co+3, one would "remove" the 4s2 electrons, then remove one from the 3d orbital, leaving you with 3d6. It asks for the number of valence electrons, but since there are no longer any electrons in the 4th shell, does that mean the number of valence electrons is now 14? (3s2 + ...
- Thu Nov 05, 2020 9:28 pm
- Forum: Ionic & Covalent Bonds
- Topic: Polyatomics ions
- Replies: 4
- Views: 185
Re: Polyatomics ions
Polyatomic ions are molecules whose atoms give the entire molecule a charge.
- Thu Nov 05, 2020 9:27 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Reviewing Answers for Midterm 1
- Replies: 13
- Views: 632
Re: Reviewing Answers for Midterm 1
I don't think we can see our answer choices, unfortunately!
- Thu Nov 05, 2020 9:24 pm
- Forum: Octet Exceptions
- Topic: Group 13 Elements
- Replies: 13
- Views: 531
Re: Group 13 Elements
Yeah, I think this is the case for Group 13 elements.
- Thu Nov 05, 2020 9:21 pm
- Forum: Lewis Structures
- Topic: writing molecular formulas
- Replies: 4
- Views: 185
Re: writing molecular formulas
I would say it'd be reasonable to have to know this. Just in case this is what you're confused about, the Roman numeral signifies the charge of the metal, since they are transition metals that can often have different charges. If the transition metal is +4, and your anion is chlorine, then you would...
- Thu Nov 05, 2020 9:18 pm
- Forum: Lewis Structures
- Topic: TB 2b 19
- Replies: 2
- Views: 153
Re: TB 2b 19
I think oxygen can have up to four bonds, since it is not an exception to the octet rule.
- Fri Oct 30, 2020 2:43 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configurations
- Replies: 15
- Views: 549
Re: Electron Configurations
I think Dr. Lavelle told us he'd accept both, but the long-hand version is preferred.
- Fri Oct 30, 2020 2:42 pm
- Forum: Student Social/Study Group
- Topic: How to relax
- Replies: 168
- Views: 28864
Re: How to relax
I like to sit in my backyard and play Clash Royale lol.
- Fri Oct 30, 2020 2:41 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Pauli Exclusion Principle
- Replies: 2
- Views: 175
Re: Pauli Exclusion Principle
I can't offer much as to the mechanics behind it, but I can discuss what it is. The Pauli Exclusion Principle states that no two electrons can have the same set of 4 quantum numbers. It comes down to m s , the spin of the electron. They can have the same n (same energy level), the same l (relates to...
- Fri Oct 30, 2020 2:32 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Shorthand Electron Configurations
- Replies: 6
- Views: 1713
Re: Shorthand Electron Configurations
That noble gas configuration starts with [Kr], which is up to the 4th period. Then, following the convention that the d-orbital in the next period comes before the s-orbital (4d10 5s2), you just work your way across the next period.
- Fri Oct 30, 2020 2:30 pm
- Forum: Student Social/Study Group
- Topic: Test Scored for Midterm 1
- Replies: 49
- Views: 2340
Re: Test Scored for Midterm 1
Hopefully Friday (today)!
- Fri Oct 23, 2020 12:58 pm
- Forum: General Science Questions
- Topic: When to use sig figs
- Replies: 19
- Views: 833
Re: When to use sig figs
I usually apply sig figs at the end of the problem.
- Fri Oct 23, 2020 12:56 pm
- Forum: Photoelectric Effect
- Topic: Intensity vs. Frequency
- Replies: 22
- Views: 1918
Re: Intensity vs. Frequency
Intensity of light is the number of photons. Frequency relates to a single photon, and whether it can eject electrons off of metal.
- Fri Oct 23, 2020 12:55 pm
- Forum: DeBroglie Equation
- Topic: Smallest Measurable Wavelength
- Replies: 7
- Views: 570
Re: Smallest Measurable Wavelength
Yep, 10^-15 meters is what Dr. Lavelle said.
- Fri Oct 23, 2020 12:53 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configuration for P
- Replies: 4
- Views: 318
Re: Electron Configuration for P
It provides the noble gas configuration.