Search found 103 matches
- Sun Mar 15, 2020 7:37 am
- Forum: Ideal Gases
- Topic: Kc vs Kp
- Replies: 109
- Views: 5029
Re: Kc vs Kp
It depends on if the give you pressures or concentrations. I am pretty sure that you can use both if its a gas though.
- Sun Mar 15, 2020 7:35 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Delta S
- Replies: 8
- Views: 1467
Re: Delta S
Total includes surroundings and system.
- Sun Mar 15, 2020 7:34 am
- Forum: Balancing Redox Reactions
- Topic: cathode vs anode
- Replies: 11
- Views: 844
Re: cathode vs anode
Anode is left, cathode on the right
- Sat Mar 14, 2020 6:22 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Partial Credit
- Replies: 2
- Views: 258
Re: Partial Credit
Maybe there is a range of values that they use that allow you to receive credit
- Sun Mar 08, 2020 9:24 pm
- Forum: Van't Hoff Equation
- Topic: Van't Hoff Equation
- Replies: 6
- Views: 583
Re: Van't Hoff Equation
I believe that the main use of the equation is to tell how K is affected by a change in temperature. That's how I've seen it used.
- Sun Mar 08, 2020 9:22 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: K < >
- Replies: 8
- Views: 562
Re: K < >
This will tell you if the reaction favors products or reactants at equilibrium. If K is greater than 1, then more products are formed. If it is less then more reactants.
- Sun Mar 08, 2020 9:20 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Exam Material Distribution
- Replies: 6
- Views: 426
Final Exam Material Distribution
Does anyone know how the material is going to be distributed for the final exam? Is it going to be mainly kinetics since that is the only thing we haven't been tested on yet or is it going to be even with all of the material?
- Sun Mar 08, 2020 9:16 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Figuring out n
- Replies: 15
- Views: 979
Re: Figuring out n
n is the moles of electrons so you need to balance out the redox reaction in order to see how many electrons are being transferred.
- Sun Mar 08, 2020 9:14 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: calculating Q
- Replies: 12
- Views: 776
Re: calculating Q
I was told that it is anode/cathode when using this equation.
- Sat Feb 29, 2020 1:03 pm
- Forum: Balancing Redox Reactions
- Topic: Reducing/Oxidizing Agents
- Replies: 13
- Views: 643
Reducing/Oxidizing Agents
Can someone explain the concept behind reducing and oxidizing agents. How do you determine which is which?
- Sat Feb 29, 2020 12:40 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: No Salt Bridge
- Replies: 7
- Views: 559
Re: No Salt Bridge
The left is losing electrons but they have no where to go so they build up. This is why the negative charge increases.
- Sat Feb 29, 2020 12:38 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Spontaneous reactions
- Replies: 6
- Views: 480
Re: Spontaneous reactions
I don't think that cell potential is affected or based on the spontaneity of the reaction but I might be wrong. The cell potential is based on the difference between potentials of the products and reactants.
- Sat Feb 29, 2020 12:36 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Anode vs Cathode
- Replies: 15
- Views: 875
Re: Anode vs Cathode
During discussion, my TA would tell us which one was the anode and which was the cathode. I think it is based off of left and right usually though.
- Sat Feb 29, 2020 12:35 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Galvanic vs Voltaic Cells
- Replies: 4
- Views: 921
Galvanic vs Voltaic Cells
Can someone explain the differences between galvanic and voltaic cells?
- Sun Feb 23, 2020 6:15 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: how to get n in equation
- Replies: 8
- Views: 544
Re: how to get n in equation
N is found by finding how many electrons are being transferred in the process.
- Sun Feb 23, 2020 6:13 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Boltzmann Formula
- Replies: 11
- Views: 892
Re: Boltzmann Formula
W is found by doing the number of positions to the power of how many molecules there are. This does have some relation to resonance,
- Sun Feb 23, 2020 6:12 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Negative E
- Replies: 3
- Views: 240
Re: Negative E
Yes. I am pretty sure that it means that the reverse is spontaneous. If positive, then the forward is spontaneous.
- Sun Feb 23, 2020 6:10 pm
- Forum: Balancing Redox Reactions
- Topic: Flow of electrons
- Replies: 11
- Views: 817
Re: Flow of electrons
I'm pretty sure that it is always anode to cathode.
- Sun Feb 23, 2020 6:09 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: neg vs pos
- Replies: 9
- Views: 745
Re: neg vs pos
I believe that it relates to if the process is spontaneous. If negative, then it is not spontaneous. If positive, it is spontaneous.
- Sun Feb 16, 2020 7:09 pm
- Forum: Balancing Redox Reactions
- Topic: Seperating Redoz RXNS
- Replies: 7
- Views: 402
Re: Seperating Redoz RXNS
I think he meant half reactions by separating the red/ox into reduced and oxidized parts. This means that you show which reactants in the rxn become reduced or oxidized in 2 different pieces.
- Sun Feb 16, 2020 7:07 pm
- Forum: Van't Hoff Equation
- Topic: delta s
- Replies: 9
- Views: 586
Re: delta s
This is because delta S naught is the standard entropy of that reaction, therefore making it constant. We then have to include the temperature to show how the observed entropy can change depending on how you change the different parameters such as temp.
- Sun Feb 16, 2020 7:05 pm
- Forum: Balancing Redox Reactions
- Topic: Memorizing charges
- Replies: 11
- Views: 744
Re: Memorizing charges
I'm pretty sure that we only need to know the really common ones that we also use as examples and in homework problems. Only the ones that are constantly repeated will have to be memorized most likely.
- Sun Feb 16, 2020 7:04 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Gibbs free energy
- Replies: 5
- Views: 333
Re: Gibbs free energy
Just like with entropy, the knot on the delta G means that it is the standard for that reaction at standard conditions.
- Sun Feb 16, 2020 7:02 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: q of ice and q of water
- Replies: 8
- Views: 1589
Re: q of ice and q of water
This is because energy has to be conserved. Therefore, if heat is loss by ice when turning to water, then that equal amount of energy must be transferred to the water.
- Sun Feb 09, 2020 7:11 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: state function mnemonic device
- Replies: 3
- Views: 1674
Re: state function mnemonic device
What is this telling us? Is it showing a relationship between them or just showing what each of the variables represents?
- Sun Feb 09, 2020 7:05 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Delta S Universe
- Replies: 3
- Views: 149
Re: Delta S Universe
I think we only use it with reversible reactions but I am not 100% sure.
- Sun Feb 09, 2020 7:04 pm
- Forum: Administrative Questions and Class Announcements
- Topic: slides
- Replies: 8
- Views: 334
Re: slides
One of the TAs just posted the slides from the thermodynamics review. I tried to attach it.
- Sun Feb 09, 2020 7:01 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Reversible vs Irreversible
- Replies: 7
- Views: 453
Re: Reversible vs Irreversible
I think with entropy it matters because one of the formulas only uses heat (reversible) divided by temperature.
- Sun Feb 09, 2020 6:53 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: 4H.9
- Replies: 1
- Views: 100
4H.9
Does anyone understand how to do 4H.9 on the homework outline? It talks about 3 different containers being filled with gases of different descriptions and asks you to tell which one will have a higher entropy change when temp is increased.
- Thu Jan 30, 2020 10:42 am
- Forum: Phase Changes & Related Calculations
- Topic: 4B.1
- Replies: 6
- Views: 242
Re: 4B.1
In that equation, the Work is equal to Work(on the system). Therefore work would be positive because the system is being compressed by the piston.
- Thu Jan 30, 2020 10:40 am
- Forum: Phase Changes & Related Calculations
- Topic: Units
- Replies: 16
- Views: 859
Re: Units
This is because we are only looking at the changes in each and because both have the same step size, it does not matter which is used.
- Thu Jan 30, 2020 10:39 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Constant Pressure
- Replies: 7
- Views: 389
Re: Constant Pressure
Constant pressure means that deltaP=0 and constant volume means that deltaV=0.
- Thu Jan 30, 2020 10:38 am
- Forum: Calculating Work of Expansion
- Topic: Integral
- Replies: 4
- Views: 213
Re: Integral
I dont think that we will use the integral equation. I think it is more to show that the Wby is equation to the area under a graph of pressure vs volume.
- Thu Jan 30, 2020 10:37 am
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: How are qp and qv different?
- Replies: 3
- Views: 129
How are qp and qv different?
What is the difference between qc and qv? Do you use both of the as enthalpy in a system?
- Sat Jan 25, 2020 6:22 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Partial Pressure vs. Concentration
- Replies: 5
- Views: 167
Re: Partial Pressure vs. Concentration
I believe in a problem it has to give you some sort of information that leads towards either using partial pressure or concentration. If it doesnt exactly specify Kc or P of something, but then gives you the moles of one of the final products, then you know that Kc should probably be used.
- Sat Jan 25, 2020 6:20 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Decreasing volume
- Replies: 5
- Views: 203
Re: Decreasing volume
I saw a Khan Academy video that explained this pretty well. The main idea of it was that if having 4 moles on the reactant side can turn into 2 moles on the product side, then you have less on the products. If you increase pressure by decreasing volume, you are making the space that everything is in...
- Sat Jan 25, 2020 6:16 pm
- Forum: Phase Changes & Related Calculations
- Topic: Entropy vs Enthalpy
- Replies: 9
- Views: 191
Entropy vs Enthalpy
Can someone explain the relationship between Entropy and Enthalpy if there is one?
- Sat Jan 25, 2020 6:11 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Enthalpy
- Replies: 2
- Views: 159
Re: Enthalpy
Vapors have a higher enthalpy than liquids because once the temperature of the system, in a water model, hits 100 degrees celsius there is more heat that is required to change the water from a liquid state to a gaseous state. This is compared to when water is at a solid ice state and needs less heat...
- Sat Jan 25, 2020 6:01 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Ka*Kb=Kw
- Replies: 5
- Views: 420
Re: Ka*Kb=Kw
Both mean the same thing so it does not matter which one that you use.
- Sun Jan 19, 2020 1:08 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Q < K
- Replies: 16
- Views: 850
Re: Q < K
Yes this is what that means. If Q is less than K, then the reaction still needs to form more products at a higher rate than it is going towards reactants.
- Sun Jan 19, 2020 11:26 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE Box
- Replies: 4
- Views: 157
Re: ICE Box
I think it is because it is a liquid and liquids aren't included when you are using concentrations that have to do with K.
- Thu Jan 16, 2020 11:21 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kc vs Kp
- Replies: 5
- Views: 215
Kc vs Kp
Can Kc be used when working with only gases or is Kp the only equilibrium constant used?
- Thu Jan 16, 2020 11:14 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: When to use K and Kp
- Replies: 12
- Views: 426
Re: When to use K and Kp
I was told that Kp can be used for gases and Kc can be used for aqueous solutions. I believe that Kc can be used for gases as well if given concentrations but I am also unsure about that.
- Thu Jan 16, 2020 11:12 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Factos effecting Equilibrium
- Replies: 6
- Views: 261
Re: Factos effecting Equilibrium
I believe that the only factor that affects the equilibrium constant is temperature. Other things can affect the value of Q, but the constant remains the same. I am not 100% sure though.
- Thu Jan 09, 2020 11:13 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K expression
- Replies: 6
- Views: 216
Re: K expression
When looking at it in a pressure sense, I saw something that was explaining it by talking about how the pressure of a gas can be changed and measured better than the pressure of solids and liquids. Can someone please explain to me how to ask a question on Chem Community. I cannot figure it out. Thanks
- Thu Jan 09, 2020 11:11 am
- Forum: Administrative Questions and Class Announcements
- Topic: Homework 1
- Replies: 18
- Views: 671
Re: Homework 1
Last quarter our homework was graded for completion I am pretty sure.
Can someone please explain to me how to ask a question on Chem Community. I cannot figure it out. Thanks
Can someone please explain to me how to ask a question on Chem Community. I cannot figure it out. Thanks
- Thu Jan 09, 2020 11:09 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Value of Kc and Kp
- Replies: 6
- Views: 208
Re: Value of Kc and Kp
I also believe that they should be the same but I am not 100% sure. I think they should be tho since the equations only have to do with the relationship between the ratios of Products to Reactants. Can someone please explain to me how to ask a question on Chem Community. I cannot figure it out. Thanks
- Thu Jan 09, 2020 11:07 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Q vs K
- Replies: 8
- Views: 233
Re: Q vs K
Q and K are essentially the same when it comes to calculating them. The difference is that K is the value when the reaction is at equilibrium while Q can be found at anytime during the reaction to see if the action is at equilibrium or not. Can someone please explain to me how to ask a question on C...
- Thu Jan 09, 2020 11:05 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 5G3
- Replies: 8
- Views: 348
Re: 5G3
I believe only gases are included when finding equilibrium constants.
Also, can someone explain how to ask a question on Chem Community? I cannot figure out how to. Thanks
Also, can someone explain how to ask a question on Chem Community? I cannot figure out how to. Thanks
- Fri Dec 06, 2019 7:02 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: pKa and Ka
- Replies: 10
- Views: 636
Re: pKa and Ka
Ka is the concentration of products over reactants and pka is the -log of that.
- Fri Dec 06, 2019 6:58 pm
- Forum: Bronsted Acids & Bases
- Topic: strong v weak acids
- Replies: 8
- Views: 489
Re: strong v weak acids
I think we just should memorize the strong acids.
- Fri Dec 06, 2019 6:54 pm
- Forum: Empirical & Molecular Formulas
- Topic: charge
- Replies: 4
- Views: 495
Re: charge
It is because there are 2 double bonds on the Sulfur and the two single bonded oxygens have a negative 1 charge.
- Fri Dec 06, 2019 6:44 pm
- Forum: Lewis Structures
- Topic: SO3 Lewis Structure
- Replies: 1
- Views: 658
Re: SO3 Lewis Structure
This is because even though S can expand its octect and have 3 double bonds, it rather just have 4 bonds and the oxygen wants the negative charge because of its electronegativity.
- Fri Dec 06, 2019 6:36 pm
- Forum: Naming
- Topic: Coordination Number
- Replies: 3
- Views: 307
Re: Coordination Number
The coordination number is 6 because there are 6 ligands attached to the centralized atom.
- Sat Nov 30, 2019 8:26 pm
- Forum: Amphoteric Compounds
- Topic: compounds
- Replies: 5
- Views: 363
Re: compounds
This means that it can be either a acid (which donates a proton) or a base (which excepts a proton).
- Sat Nov 30, 2019 8:25 pm
- Forum: Bronsted Acids & Bases
- Topic: HBr
- Replies: 3
- Views: 247
Re: HBr
I believe this is correct because the H+ fully dissoctiates from HBr and bonds with the H20.
Re: Complex
conjugates have a central atom with ligands bonded to that central atom.
Re: Conjugate
A conjugate is a compound made up of two or more compounds.
- Sat Nov 30, 2019 8:21 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Weak Acids & Bases
- Replies: 6
- Views: 407
Re: Weak Acids & Bases
Weak acids means that the there is not a full dissociation of H+ in water.
- Wed Nov 20, 2019 1:38 pm
- Forum: Hybridization
- Topic: Test 2
- Replies: 6
- Views: 380
Re: Test 2
To expand on what max said, test 2 only forces you to know that sigma bonds are single bonds and pi bonds are in double bonds.
- Wed Nov 20, 2019 1:37 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone Pairs
- Replies: 8
- Views: 593
Re: Lone Pairs
Lone pairs have a bigger cloud around them versus a bound atom. This pushes the other surrounding atoms slightly farther than a bound atom would normally making the angles smaller.
- Wed Nov 20, 2019 1:34 pm
- Forum: Hybridization
- Topic: pi bond orientation
- Replies: 4
- Views: 153
Re: pi bond orientation
The orbitals of the bonds are arranged side by side which makes it so that they cannot rotate amongst themselves.
- Wed Nov 20, 2019 1:33 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Do we need to know the pentagonal bipyramidal model for Test 2?
- Replies: 6
- Views: 406
Re: Do we need to know the pentagonal bipyramidal model for Test 2?
I do not think that this is one of the main ones that we need to know. I am not 100% sure tho so dont go by my word completely just to be safe.
- Wed Nov 20, 2019 1:32 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligands
- Replies: 4
- Views: 225
Re: Ligands
I am pretty positive that the ligand has to be the surrounding bound atoms.
- Sun Nov 17, 2019 12:21 pm
- Forum: Bond Lengths & Energies
- Topic: Quiz for Next week dashes/wedges
- Replies: 11
- Views: 654
Re: Quiz for Next week dashes/wedges
I would not worry about dashes and wedges because he did say to not worry about them.
- Sun Nov 17, 2019 12:16 pm
- Forum: Lewis Structures
- Topic: Carbon Monoxide
- Replies: 4
- Views: 338
Re: Carbon Monoxide
I think it is because the extra bond makes the molecule more stable.
- Thu Nov 14, 2019 4:14 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: How to study for test 2?
- Replies: 3
- Views: 201
Re: How to study for test 2?
My TA said that it should be outline 4. So I'm thinking that it's VESPR and intermolecular bonds like van der wals and hydrogen bonds.
- Thu Nov 14, 2019 4:12 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular Shape Name
- Replies: 17
- Views: 895
Re: Molecular Shape Name
I think that we probably just have to know the ones that were said in lecture.
- Thu Nov 14, 2019 4:10 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Trigonal pyramidal angles
- Replies: 4
- Views: 195
Re: Trigonal pyramidal angles
This isn't exactly answering your question but I have the tetrahedral angles at 109.5. For the trigonal bipyramidal shape, the trigonal bond angles are 120 and the axial bond angles are 90 and 180.
- Thu Nov 14, 2019 4:06 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Do we need to know bent structures?
- Replies: 5
- Views: 244
Re: Do we need to know bent structures?
How do we tell if the structure is going to be bent versus linear?
- Thu Nov 14, 2019 4:05 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Test 2
- Replies: 11
- Views: 554
Re: Test 2
I talked to my TA and he told me that the test should be pretty much bust all of outline 4 i think.
- Mon Nov 11, 2019 3:47 pm
- Forum: Bond Lengths & Energies
- Topic: Shorter bond lengths
- Replies: 12
- Views: 710
Re: Shorter bond lengths
It's because the more bonds, the closer the molecules will be pulled together.
- Mon Nov 11, 2019 3:43 pm
- Forum: Dipole Moments
- Topic: Ep Meaning
- Replies: 4
- Views: 509
Re: Ep Meaning
For this instance, Ep does stand for potential energy.
- Mon Nov 11, 2019 3:42 pm
- Forum: Dipole Moments
- Topic: Dipoles
- Replies: 3
- Views: 136
Re: Dipoles
I think molecules have dipole moments when one atom is more electronegative than the other, such as water.
- Sun Nov 03, 2019 9:32 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm
- Replies: 16
- Views: 740
Re: Midterm
I used the video modules that he has on the class site for the first test and those felt like they helped me a bunch.
- Sun Nov 03, 2019 9:20 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm
- Replies: 16
- Views: 740
Re: Midterm
Do we have to memorize all constants and equations for the test or will there be some formula sheet?
- Sun Nov 03, 2019 3:26 pm
- Forum: Electronegativity
- Topic: Ionic or covalent?
- Replies: 17
- Views: 829
Re: Ionic or covalent?
Ionic compounds are from metals and covalent are non metals.
- Sun Nov 03, 2019 3:24 pm
- Forum: Ionic & Covalent Bonds
- Topic: Electron Configuration
- Replies: 7
- Views: 436
Re: Electron Configuration
I also believe that the way to do it is to get the charge closest to zero so that it is stable.
- Sun Nov 03, 2019 3:16 pm
- Forum: Lewis Structures
- Topic: Limiting Reactants
- Replies: 3
- Views: 140
Re: Limiting Reactants
Yea I am pretty sure it is theoretically but in an actual experiment, there could be outside factors and side reactions that take place that could change the actual yield.
- Sun Nov 03, 2019 3:11 pm
- Forum: *Shrodinger Equation
- Topic: H ψ = E ψ
- Replies: 2
- Views: 279
Re: H ψ = E ψ
The H is the Hamiltonian which is just an operator that acts on the ψ. The ψ describes the system mathematically and E is energy. In the review, the problem that was used as an example basically just gave you the H and you had to plug it into the equation and not solve. I think we just have to know ...
- Sun Nov 03, 2019 3:06 pm
- Forum: *Shrodinger Equation
- Topic: Review
- Replies: 4
- Views: 437
Re: Review
I just came from the one at 2pm and it was formatted so that he went over different topics and what they meant and then did a couple examples. It was helpful.
- Sun Nov 03, 2019 3:04 pm
- Forum: Electronegativity
- Topic: What is isoelectronic?
- Replies: 13
- Views: 803
Re: What is isoelectronic?
Isoelectronic is when different ions have the same number of electrons. For example, Na+ is isoelectronic with neon.
- Sun Oct 27, 2019 1:07 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Length
- Replies: 4
- Views: 266
Re: Bond Length
I am not 100% sure but i thought that the triple and double bonds are shorter in theory but when they were actually tested they were the same as the single bonds.
- Sun Oct 27, 2019 12:53 pm
- Forum: Ionic & Covalent Bonds
- Topic: Double bond placement
- Replies: 15
- Views: 886
Re: Double bond placement
I am pretty sure that you can put them anywhere as long as the formal charges are correct.
- Sun Oct 27, 2019 12:51 pm
- Forum: Trends in The Periodic Table
- Topic: atomic Radii
- Replies: 11
- Views: 442
Re: atomic Radii
This is because the more electrons, the more shells there will be and the more shells, the bigger the difference between the nucleus and the electrons.
- Sun Oct 27, 2019 12:49 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Stability
- Replies: 9
- Views: 565
Re: Stability
The formal charge of the atom relates to how stable it is because if it is zero then it has less of a chance to gain or lose an electron.
- Sun Oct 27, 2019 12:43 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization Energy
- Replies: 9
- Views: 410
Re: Ionization Energy
Ionization energy is always positive because it requires energy in the system to remove the electron. If it was negative, that means that it is loosing energy.
- Sun Oct 20, 2019 3:43 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: h bar
- Replies: 3
- Views: 310
Re: h bar
H BAR is refering to plancks constant and manipulates it when doing problems.
- Sun Oct 20, 2019 3:39 pm
- Forum: Properties of Light
- Topic: Light as a wave
- Replies: 4
- Views: 216
Re: Light as a wave
I am not 100% sure but I am pretty certain that it does not matter where the light strikes because it still just depends on the intensity of the light and the energy in a photon.
- Sun Oct 20, 2019 3:37 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: What does the H mean?
- Replies: 9
- Views: 881
Re: What does the H mean?
The H bar is referring to plancks constant when using it in problems.
- Sun Oct 20, 2019 3:29 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Effect
- Replies: 7
- Views: 323
Re: Photoelectric Effect
It does not make the electron eject because each photon needs to have enough energy to make the electron eject. If the photons don't have enough of the energy, having more photons is not going to help.
- Sun Oct 20, 2019 3:27 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Valence electrons
- Replies: 4
- Views: 169
Re: Valence electrons
The valence electrons include both because valence electrons mean all electrons in the outer shell.
- Sun Oct 13, 2019 7:59 pm
- Forum: General Science Questions
- Topic: THe mole
- Replies: 5
- Views: 227
Re: THe mole
I am not completely sure why carbon was chosen but I assumed that it had something to do with the importance of carbon and it's relevance in life in general.
- Sun Oct 13, 2019 7:56 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric experiment
- Replies: 3
- Views: 129
Re: Photoelectric experiment
This is because they believed that the higher the intensity the higher the energy but the intensity of the light did not matter if there was not enough energy in the photons that were with the wave.
- Thu Oct 10, 2019 2:43 pm
- Forum: Significant Figures
- Topic: Conflicting Sig Fig Advice
- Replies: 3
- Views: 218
Re: Conflicting Sig Fig Advice
I feel like the safest way to do it is to keep your sig figs long throughout the problem and then round at the end in order to get the most precise answer like you said. That's what I've been doing and I feel like you can't go wrong that way.
- Thu Oct 10, 2019 2:34 pm
- Forum: Properties of Light
- Topic: Waves/Particles
- Replies: 14
- Views: 560
Re: Waves/Particles
From how I understand it, the photons deliver somewhat of a "package" of energy that allows the electrons to jump to different levels.
- Thu Oct 10, 2019 2:32 pm
- Forum: Properties of Electrons
- Topic: Photoelectric Effect Experiment
- Replies: 5
- Views: 187
Re: Photoelectric Effect Experiment
Yes, the light is transferring energy through photons in the photon model of the experiment. I do not completely understand what is happening in the wave model of the experiment though.
- Sun Oct 06, 2019 4:09 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Which Volume to use for M1
- Replies: 6
- Views: 318
Re: Which Volume to use for M1
I always write M1V1 as MiVi to help me remember that those are the initial volumes and molarity for the problems.
- Sun Oct 06, 2019 4:05 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Mole help [ENDORSED]
- Replies: 8
- Views: 474
Re: Mole help [ENDORSED]
I find it easy to think of moles when I think of them in something other than a chemistry example. When I think about them as strictly just being a unit of measurement for anything, such as fruit, then the idea becomes simpler.
- Sun Oct 06, 2019 4:00 pm
- Forum: Limiting Reactant Calculations
- Topic: Reviewing High School Chem Tips
- Replies: 10
- Views: 861
Re: Reviewing High School Chem Tips
I know that Lavelle offers chemistry review sessions led by TA's that are pretty useful, especially for the highschool material.