Search found 100 matches
- Sun Mar 08, 2020 11:36 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Half/Rxn & Balanced Equations for galvanic cells.
- Replies: 8
- Views: 550
Re: Half/Rxn & Balanced Equations for galvanic cells.
we typically add platinum to either (or both) side of the cell diagram if there isn't already an electrode in it
- Sun Mar 08, 2020 11:34 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Favoring reactions
- Replies: 7
- Views: 552
Re: Favoring reactions
The forward reaction will be favored if delta G is negative and vice versa
- Sun Mar 08, 2020 11:29 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Adding Pt(s) to a Cell Diagram
- Replies: 14
- Views: 825
Re: Adding Pt(s) to a Cell Diagram
We add platinum to a cell diagram when there isn't already an electrode to help transport the electrons
- Thu Mar 05, 2020 9:41 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Combustion of gas
- Replies: 6
- Views: 515
Combustion of gas
Will the combustion of gas always be spontaneous?
- Wed Mar 04, 2020 11:35 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: writing cell diagramsl
- Replies: 4
- Views: 283
writing cell diagramsl
When writing a cell diagram, do we leave out H2O? if so, is that the only compound we need to not include if given the half reactions?
- Wed Mar 04, 2020 9:12 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: cell diagram
- Replies: 1
- Views: 131
cell diagram
in a given cell diagram, if the pressure of two different compounds is given as 1.0 bar and 1.0 molxL^-1, when we are setting up Q, do we ignore the units or are they the same? (6N.5 part a for reference)
- Wed Mar 04, 2020 8:35 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: cell diagrams
- Replies: 1
- Views: 150
cell diagrams
if a compound appears on both sides of a salt bridge (or the double line), do we not include it in our half reactions? for example in 6N #3 part a and c
- Wed Mar 04, 2020 8:02 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Exercise 6N 1b
- Replies: 2
- Views: 188
Exercise 6N 1b
In exercise 6N 1b, why is n=2 and not n=1? More specifically, in the solutions manual, it gives the reduction half reaction as: In3+ +2e- --> In2+
but in appendix 2B, it only shows one electron in the previous equation
but in appendix 2B, it only shows one electron in the previous equation
- Tue Mar 03, 2020 10:17 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Writing cell diagrams
- Replies: 2
- Views: 164
Writing cell diagrams
When writing cell diagrams and after having found the cathode and anode half reactions, do we ignore the coefficients of the molecules when putting them into the cell diagram?
- Tue Mar 03, 2020 9:50 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Standard Potentials
- Replies: 2
- Views: 202
Standard Potentials
If the cell potential isn't explicitly given, how do we calculate for it? For example, in 6M 3. (a) Pt(s)|Cr3+ (aq),Cr2+ (aq)||Cu2+ (aq)|Cu(s), the cell potential for Cr is not in the tables of potential values provided, so how do we go about problems like these?
- Sun Mar 01, 2020 7:50 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: cell diagrams
- Replies: 8
- Views: 454
cell diagrams
Will the anode always be on the left and the cathode always on the right or does it depend on the compounds involved?
- Sun Mar 01, 2020 7:43 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: electrodes
- Replies: 5
- Views: 358
electrodes
When an electrolytic cell is missing an electrode, will we always use platinum or does it depend on the other compounds involved?
- Sun Mar 01, 2020 7:33 pm
- Forum: Balancing Redox Reactions
- Topic: basic solution
- Replies: 4
- Views: 286
basic solution
When we have a basic solution and want to balance the half reactions, would the compounds we use be different than what we use for an acidic solution? For example in an acidic solution, we first add H2O to balance the oxygens and then add H+ ions to balance the hydrogens.
- Sun Mar 01, 2020 7:31 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: delta G=-nFE
- Replies: 7
- Views: 478
delta G=-nFE
If the n in DeltaG=-nFE is not explicitly given, how do we calculate its value?
- Sun Mar 01, 2020 7:28 pm
- Forum: Balancing Redox Reactions
- Topic: oxidizing agents
- Replies: 11
- Views: 588
oxidizing agents
How come the oxidizing agents are the opposite of what is being oxidized? and the same for the reduction agents
- Sun Feb 23, 2020 11:29 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: salt bridge
- Replies: 9
- Views: 628
Re: salt bridge
the purpose of a salt bridge is to allow electrons to move between the anode and cathode without there being an interruption in the flow
- Sun Feb 23, 2020 11:27 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Platinum
- Replies: 2
- Views: 226
Re: Platinum
platinum is the most common electrode for a half reaction that doesn't already have one for the electrons to travel through.
- Sun Feb 23, 2020 11:23 pm
- Forum: Balancing Redox Reactions
- Topic: Determining direction of flow
- Replies: 15
- Views: 754
Re: Determining direction of flow
the flow will go from left to right as it goes from anode to cathode, and another way to look at it is that it is going from negative charge to positive charge
- Sun Feb 23, 2020 11:20 pm
- Forum: Balancing Redox Reactions
- Topic: basic solution
- Replies: 3
- Views: 245
basic solution
what compound do we add if we need for O in a basic solution and why?
- Sun Feb 23, 2020 11:19 pm
- Forum: Balancing Redox Reactions
- Topic: acidic solutions
- Replies: 3
- Views: 292
acidic solutions
which compound do we use if we need more H in an acidic solution?
- Sun Feb 16, 2020 10:25 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Entropy of the System for irreversible expansions
- Replies: 8
- Views: 525
Re: Entropy of the System for irreversible expansions
Since entropy is a state function, that means the path you take does not matter, so they will technically be the same.
- Sun Feb 16, 2020 10:23 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Is spontaneity determined by entropy or free energy?
- Replies: 9
- Views: 1895
Re: Is spontaneity determined by entropy or free energy?
Even if your value of delta S of the surroundings is greater than zero, the reaction does not have to be spontaneous, but according to the 2nd law of thermodynamics, the process will be spontaneous if delta Stot is a positive value.
- Sun Feb 16, 2020 10:19 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Delta S
- Replies: 8
- Views: 632
Re: Delta S
Delta S is equal to the entropy of the system whereas delta Ssurroundings is the entropy of the surroundings and so delta Stot is the entropy of the surroundings and system added together.
- Sun Feb 16, 2020 10:15 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Standard Enthalpies of Formation
- Replies: 10
- Views: 516
Re: Standard Enthalpies of Formation
Elements that are in their most stable form, such as H2(g) and Fe(s), will have standard enthalpies of formation equal to zero.
- Sun Feb 16, 2020 10:10 pm
- Forum: Phase Changes & Related Calculations
- Topic: Negative Work
- Replies: 18
- Views: 1382
Re: Negative Work
Since the system is doing work, your value should be negative whereas it would be positive if work was being done on the system
- Sun Feb 16, 2020 10:06 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Equilibrium
- Replies: 15
- Views: 784
Re: Equilibrium
Since both the forward and reverse reactions are occurring at the same rate in equilibrium, delta G naught would be equal to zero
- Wed Feb 12, 2020 12:03 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Four Cases
- Replies: 2
- Views: 187
Four Cases
Will we need to know the four cases of the effects of temperature for calculating dG along with the graphs explained and shown in 4J.4?
- Tue Feb 11, 2020 10:16 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Boltzmann Formula
- Replies: 3
- Views: 157
Boltzmann Formula
Will there be any problems on the midterm that requires us to use the Boltzmann formula and to know how to calculate for systems with different numbers of microstates?
- Tue Feb 11, 2020 9:49 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Using Eq1
- Replies: 1
- Views: 85
Using Eq1
When using the first given equation in the book for calculating the change in enthalpy, dS=qrev/T, do we have to know all three of the listed facts also given in the book?
- Tue Feb 11, 2020 8:31 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Delta H of vaporization
- Replies: 1
- Views: 115
Delta H of vaporization
Are the values of Delta H of vaporization typically endothermic or exothermic?
- Sun Feb 02, 2020 11:38 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: expansion
- Replies: 5
- Views: 296
Re: expansion
In terms of thermodynamics, expansion is referring to when the volume of a system increases
- Sun Feb 02, 2020 11:34 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Closed vs isolated systems
- Replies: 24
- Views: 826
Re: Closed vs isolated systems
One of the main differences is that closed systems cannot exchange mass with its surroundings however it can exchange energy, meanwhile isolated systems cannot exchange either.
- Sun Feb 02, 2020 11:26 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: R constants
- Replies: 40
- Views: 2111
Re: R constants
The value of R we use depends on the units of the problem you are trying to solve.
- Sun Feb 02, 2020 11:24 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Phase change
- Replies: 20
- Views: 787
Re: Phase change
Delta H would be positive when ice turns to liquid
- Sun Feb 02, 2020 11:22 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Constant pressure
- Replies: 19
- Views: 627
Re: Constant pressure
Yes, you are correct, we are referring to constant pressure
- Sun Feb 02, 2020 11:15 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Changing the energy of a system
- Replies: 9
- Views: 312
Re: Changing the energy of a system
Three ways to change the energy of a system include work, mass flow, and heat.
- Sun Feb 02, 2020 11:08 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Cv or Cp
- Replies: 5
- Views: 654
Re: Cv or Cp
Cp=5/2R is used when you need to find the heat capacity of an ideal gas with a constant pressure and Cv=3/2R is used when you need to find the heat capacity of an ideal gas with a constant volume
- Sun Feb 02, 2020 11:07 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Steam burns
- Replies: 8
- Views: 258
Re: Steam burns
Since steam releases a lot more energy in comparison to regular boiling water, the burn that the steam inflicts is much more severe than that of the boiling water.
- Sun Feb 02, 2020 11:03 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: standard enthalpy of formation
- Replies: 1
- Views: 130
standard enthalpy of formation
Why do elements in their standard states have a standard enthalpy of formation equal to zero?
- Sun Feb 02, 2020 11:00 pm
- Forum: Calculating Work of Expansion
- Topic: temperature
- Replies: 7
- Views: 355
temperature
Why is the temperature change for celsius and kelvin the same? For example, if delta T was 8 for celsius, why is it also 8 for kelvin?
- Sun Jan 26, 2020 8:34 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Bond Enthalpies
- Replies: 6
- Views: 119
Re: Bond Enthalpies
Dr.Lavelle won't expect us to draw them but he did say that it is quite helpful so it is one way to work through a problem if you get stuck.
- Sun Jan 26, 2020 8:29 pm
- Forum: Phase Changes & Related Calculations
- Topic: enthalpy of phase changes
- Replies: 8
- Views: 226
enthalpy of phase changes
Will a calculation of the enthalpy of vaporization, fusion, or sublimation ever result in a negative value?
- Sun Jan 26, 2020 8:25 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Standard Reaction Enthalpy
- Replies: 3
- Views: 141
Standard Reaction Enthalpy
How do you calculate the standard reaction enthalpy if the bond enthalpies are not available? Can you please include an example too
- Sun Jan 26, 2020 8:23 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Hess's Law
- Replies: 4
- Views: 192
Re: Hess's Law
I believe the second method that Dr. Lavelle covered in lecture that uses bond enthalpies to calculate the total enthalpy is the least accurate method.
- Sun Jan 26, 2020 8:20 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Ka and Kb
- Replies: 10
- Views: 482
Re: Ka and Kb
No, I believe Ka and Kb values can also apply to strong acids and bases as well as weak ones.
- Sun Jan 26, 2020 8:18 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Energy of the reactants
- Replies: 6
- Views: 298
Re: Energy of the reactants
If the energy of the products is greater than that of the reactants, then it can be said that the reaction is endothermic.
- Sun Jan 26, 2020 8:16 pm
- Forum: Ideal Gases
- Topic: R Constant
- Replies: 18
- Views: 1038
Re: R Constant
There are different values for the constant R but that is only because it depends on the units that are being used, but they will be provided on the equation sheet that is given on the tests.
- Sun Jan 26, 2020 8:14 pm
- Forum: Phase Changes & Related Calculations
- Topic: phase changes
- Replies: 2
- Views: 134
phase changes
How do we make up for a difference in phases when trying to calculate for the total enthalpy? Can you please give an example, thank you!
- Sun Jan 26, 2020 8:07 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: enthalpy changes
- Replies: 2
- Views: 54
enthalpy changes
Will we have to memorize any of the numbers for the more commonly used elements/compounds?
- Sun Jan 26, 2020 7:57 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: percent ionization
- Replies: 5
- Views: 169
percent ionization
Why does a small percentage of initial make the approximation acceptable?
- Sun Jan 12, 2020 9:12 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Calculating for Pressure
- Replies: 5
- Views: 192
Calculating for Pressure
When trying to calculate the pressure of a substance, is it possible to do so without being given temperature?
- Sun Jan 12, 2020 9:10 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Response of Equilibria to Change
- Replies: 6
- Views: 137
Response of Equilibria to Change
Could somebody explain the quick way to determine a response of equilibria to change? Dr. Lavelle mentioned it in lecture but I hadn't heard of it prior to when he talked about it so I'm still a little confused.
- Sun Jan 12, 2020 9:04 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Calculating Q
- Replies: 16
- Views: 709
Calculating Q
When calculating Q, how come we include aqueous substances?
- Sun Jan 12, 2020 9:01 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Partial Pressure
- Replies: 3
- Views: 132
Partial Pressure
Is it possible to calculate the partial pressure when only given the chemical compound? If so, how?
- Sun Jan 12, 2020 8:59 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Partial Pressure
- Replies: 19
- Views: 696
Partial Pressure
When calculating for the reaction quotient, will the partial pressure be given in a problem or do we have to solve for it?
Naming
In the example of potassium hexacyanido ferrate (II), would the suffix for iron be different if the charge on the coordination compound was positive?
Naming
Does the cation always come before the anion? If so, why is that?
- Sun Dec 01, 2019 11:13 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Relative Acidity
- Replies: 3
- Views: 181
Relative Acidity
Can there ever be a case in which the resulting anion is not stable?
- Sun Dec 01, 2019 11:12 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Strong Acids
- Replies: 3
- Views: 172
Strong Acids
Why does a stronger acid have a lower pka value as opposed to a weaker acid?
- Sun Dec 01, 2019 11:09 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Relative Acidity
- Replies: 4
- Views: 230
Relative Acidity
When in reference to relative acidity, what does charge delocalization stabilize? Dr.Lavelle mentioned this in lecture but I was not able to hear the rest of the sentence.
- Sun Nov 24, 2019 11:59 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligand
- Replies: 10
- Views: 495
Re: Ligand
A molecule that is attached to the central metal
- Sun Nov 24, 2019 11:58 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: question
- Replies: 1
- Views: 124
question
Will we need to be familiar with density isosurface and electrostatic potential surface for the class?
- Sun Nov 24, 2019 11:55 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: bonds
- Replies: 2
- Views: 200
bonds
How can a poly atomic molecule be nonpolar if it’s bonds are polar?
- Sun Nov 24, 2019 11:53 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: energy
- Replies: 1
- Views: 147
energy
Why is the energy the lowest if the atoms bounded to the central atom are far from lone pairs?
- Sun Nov 24, 2019 11:53 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR formula
- Replies: 5
- Views: 308
VSEPR formula
If we are able to determine the shape of a molecule with the VSEPR formula, but not the angles, will we need to know how to calculate for the angles?
- Sun Nov 17, 2019 11:09 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR notation
- Replies: 6
- Views: 400
Re: VSEPR notation
Yes, those VSEPR notations are correct and I believe the corresponding shapes would be tetrahedral and trigonal pyramidal (correct me if I am wrong please).
- Sun Nov 17, 2019 11:02 pm
- Forum: Hybridization
- Topic: Pi and Sigma Bonds
- Replies: 17
- Views: 1194
Re: Pi and Sigma Bonds
For a double bond, there is 1 sigma bond and 1 pi bond and for a triple bond, there is 1 sigma bond and 2 pi bonds.
- Sun Nov 17, 2019 10:37 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Vsepr Rules
- Replies: 2
- Views: 201
Vsepr Rules
What does the second vsepr rule tell us?
- Sun Nov 17, 2019 10:36 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: types of bonds
- Replies: 14
- Views: 1158
Re: types of bonds
Yes, a triple bond has 1 sigma bond and 2 pi bonds whereas a single bond has 1 sigma bond and a double bond has one sigma bond and one pi bond.
- Sun Nov 17, 2019 10:35 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Sigma and Pi Bonds
- Replies: 33
- Views: 1543
Sigma and Pi Bonds
In a triple bond, does it matter the order in which the sigma and pi bonds are?
- Sun Nov 17, 2019 10:32 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: AXE
- Replies: 5
- Views: 331
Re: AXE
The AXE formula is quite helpful in determining the shape of a molecule and the shortcuts Dr. Lavelle taught us is even more helpful.
- Sun Nov 17, 2019 10:07 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Drawing molecules
- Replies: 12
- Views: 661
Re: Drawing molecules
While it might not be necessary to draw the molecules, it might be helpful in determining the shape and bond angles of the molecule.
- Sun Nov 17, 2019 10:03 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone Pairs
- Replies: 10
- Views: 511
Re: Lone Pairs
Since lone pairs result in repulsion of the atoms in the molecule, the geometry of the molecule will be affected.
- Sun Nov 17, 2019 10:00 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: vsepr angles
- Replies: 10
- Views: 415
Re: vsepr angles
I think it would be best to memorize both the bond angles and the shapes, especially for the upcoming test.
- Sun Nov 17, 2019 9:59 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: dipole moments
- Replies: 11
- Views: 579
Re: dipole moments
When the dipoles are facing opposite directions, they will cancel out.
- Sun Nov 17, 2019 9:56 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Shapes
- Replies: 5
- Views: 267
Shapes
How do we determine the shape of a molecule that has more than one central atom?
- Sun Nov 10, 2019 10:25 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polar Covalent VS Ionic
- Replies: 11
- Views: 619
Re: Polar Covalent VS Ionic
The difference in electronegativity levels will allow you to distinguish what type of bond it is.
- Sun Nov 10, 2019 10:22 pm
- Forum: Sigma & Pi Bonds
- Topic: Triple bond?
- Replies: 18
- Views: 1655
Re: Triple bond?
In the case of a triple bond, there should be a single sigma bond and two pi bonds.
- Sun Nov 10, 2019 10:21 pm
- Forum: Sigma & Pi Bonds
- Topic: Quantum Numbers
- Replies: 9
- Views: 567
Re: Quantum Numbers
Knowing the quantum numbers of an orbital will allow you to recognize the energy levels of each.
- Sun Nov 10, 2019 10:19 pm
- Forum: Octet Exceptions
- Topic: electron number in octet
- Replies: 8
- Views: 555
Re: electron number in octet
The number of electrons that a molecule with an expanded octet can have is dependent on the type of element it is.
- Sun Nov 10, 2019 10:17 pm
- Forum: Lewis Structures
- Topic: Bonds
- Replies: 4
- Views: 179
Bonds
What must we take into consideration if we are trying to use double or triple bonds?
- Sun Nov 10, 2019 10:16 pm
- Forum: Dipole Moments
- Topic: Dipole
- Replies: 1
- Views: 107
Dipole
To what extent should we familiarize ourselves with anything concerning dipoles?
- Sun Nov 10, 2019 10:12 pm
- Forum: Ionic & Covalent Bonds
- Topic: Bond Strength
- Replies: 3
- Views: 171
Bond Strength
Why are ionic bonds typically stronger than covalent bonds?
- Sun Nov 10, 2019 10:10 pm
- Forum: Lewis Structures
- Topic: Lewis Dot Structures
- Replies: 7
- Views: 364
Lewis Dot Structures
If an element has an odd number of electrons, does it matter which side of the element shorthand we put it on?
- Sun Nov 10, 2019 10:06 pm
- Forum: Electronegativity
- Topic: Electronegativity
- Replies: 5
- Views: 223
Electronegativity
What does an element’s valence electrons determine in terms of its electronegativity?
- Mon Nov 04, 2019 1:09 am
- Forum: Quantum Numbers and The H-Atom
- Topic: Quantum Numbers
- Replies: 6
- Views: 480
Quantum Numbers
I am having a bit trouble understanding the concept behind the quantum number ms. How do we determine this value?
- Mon Nov 04, 2019 1:08 am
- Forum: Dipole Moments
- Topic: Polar Covalent Bonds
- Replies: 2
- Views: 90
Polar Covalent Bonds
Why is it that the electrons in covalent bonds are not equally shared?
- Mon Nov 04, 2019 1:06 am
- Forum: Dipole Moments
- Topic: Ion and Molecule Interactions
- Replies: 2
- Views: 172
Ion and Molecule Interactions
Will we have to memorize each kJ.mol^-1 value for the interactions that give rise to attractive forces?
- Mon Nov 04, 2019 1:02 am
- Forum: Electronegativity
- Topic: Trend of Electronegativity
- Replies: 22
- Views: 2036
Trend of Electronegativity
In what way should we describe the trends of electronegativity?
- Mon Nov 04, 2019 1:01 am
- Forum: Lewis Structures
- Topic: Lewis Dot Structures
- Replies: 4
- Views: 151
Lewis Dot Structures
In a Lewis dot structure, if an element were to have 4 dots, would we arrange them in such a way that there is one dot on each side of the element shorthand or would we arrange them so that two sides of the element’s shorthand has a pair of dots?
- Sun Oct 27, 2019 6:30 pm
- Forum: Properties of Electrons
- Topic: Mass of an Electron
- Replies: 14
- Views: 484
Re: Mass of an Electron
Since the mass of an electron does not vary depending on the element, it is known to have a set mass of 9.109 x 10^-31 kg, which is also considered a constant.
- Sun Oct 27, 2019 6:25 pm
- Forum: Properties of Electrons
- Topic: Chemical bonds
- Replies: 2
- Views: 184
Chemical bonds
Can somebody explain the difference in formation of ionic compounds and forming a molecule because the notes say that both have to do with achieving the lowest energy.
- Sun Oct 27, 2019 6:15 pm
- Forum: Properties of Electrons
- Topic: Electron resonance
- Replies: 2
- Views: 93
Electron resonance
What does it mean for an electron that is involved in resonance structures to be delocalized?
- Sun Oct 27, 2019 6:10 pm
- Forum: Properties of Electrons
- Topic: Electron removal
- Replies: 11
- Views: 383
Electron removal
Why are electrons that are further away from the nucleus easier to remove?
- Sun Oct 27, 2019 6:05 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: p-orbitals
- Replies: 11
- Views: 390
p-orbitals
Would we have to write out all the p-orbital values or can we keep it simplified? Example: N: 1s^2 2s^2 2px^1 2py^1 2pz^1, or can we just write it as 1s^2 2s^2 2p^3?
- Sun Oct 13, 2019 11:38 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Class example
- Replies: 2
- Views: 93
Class example
In the example done in class on October 9th, we calculated for the change in energy for the electron and we got a negative answer, however, when we used that value to calculate the frequency of the light, it was positive. Why was wasn’t the negative sign included?
- Sun Oct 13, 2019 11:31 pm
- Forum: Photoelectric Effect
- Topic: Threshold and activation energy
- Replies: 3
- Views: 187
Threshold and activation energy
Why is the threshold energy greater than the activation energy?
- Sun Oct 13, 2019 11:24 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Electron properties
- Replies: 1
- Views: 115
Electron properties
Why does having wavelike properties prevent the electron from collapsing down to the nucleus?
- Sun Oct 13, 2019 11:22 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg equation [ENDORSED]
- Replies: 73
- Views: 8674
Re: Rydberg equation [ENDORSED]
If we are given a problem where we must calculate ΔE using empirical equation for a hydrogen atom, must we memorize Rydberg’s constant or can we determine the answer by other means?
- Sun Oct 13, 2019 11:15 pm
- Forum: Properties of Light
- Topic: Intensity & Amplitude
- Replies: 7
- Views: 423
Re: Intensity & Amplitude
Since the intensity of light is proportional to the square of its amplitude, if the amplitude were to increase, so would the intensity.