Search found 111 matches
- Wed Mar 11, 2020 3:37 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: rate constant
- Replies: 5
- Views: 410
Re: rate constant
Rate constant is affected by temperature and activation energy in the equation. Catalysts lower the activation energy and speed up the reaction.
- Wed Mar 11, 2020 3:35 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Identifying Catalysts and intermediates
- Replies: 4
- Views: 347
Re: Identifying Catalysts and intermediates
Intermediates will first be formed as a product and then used up as a reactant while catalyst will first be used as a reactant and then show up a product.
- Wed Mar 11, 2020 3:32 pm
- Forum: First Order Reactions
- Topic: Determining Order
- Replies: 7
- Views: 480
Re: Determining Order
You can also look at units of the rate constant if it is given and be able to tell what the order is.
- Wed Mar 11, 2020 3:31 pm
- Forum: First Order Reactions
- Topic: Replacing Ln
- Replies: 2
- Views: 249
Re: Replacing Ln
Yes you can use either equation with the log or the ln because the conversion between them is part of the equation, so you should get the same answer.
- Wed Mar 11, 2020 3:24 pm
- Forum: General Rate Laws
- Topic: Rate limiting step
- Replies: 13
- Views: 789
Re: Rate limiting step
It is the slowest step of the reaction, since the other steps are much faster, it determines the rate of the overall reaction.
- Sun Mar 08, 2020 11:29 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: concentration cells
- Replies: 4
- Views: 307
Re: concentration cells
In a concentration cells both the anode and cathode side contain the same species, but with different concentrations. Also the E naught of the cell is zero.
- Sun Mar 08, 2020 11:19 pm
- Forum: Balancing Redox Reactions
- Topic: Redox Table
- Replies: 6
- Views: 428
Re: Redox Table
If you already flip the value for the oxidation part of the reaction, then you just have to add them, or you can subtract the cathode from the anode for both reduction values. Either way it is the same, but it can get confusing.
- Sun Mar 08, 2020 11:17 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Work max
- Replies: 4
- Views: 486
Re: Work max
Delta G gives the best case scenario, so it shows the maximum amount of work that could be done. I do not think there are any exceptions.
- Sun Mar 08, 2020 11:15 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagrams
- Replies: 13
- Views: 875
Re: Cell Diagrams
You only add a solid (usually Pt) to whichever side, if any, does not already have one. If the reaction for each side already contains a solid, do not add one.
- Sun Mar 08, 2020 11:11 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Instantaneous Rate
- Replies: 41
- Views: 2251
Re: Instantaneous Rate
The rate is high as the reaction begins because there are more reactants, as the concentration of reactants decreases, the rate decreases.
- Sun Mar 01, 2020 11:33 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: N value
- Replies: 7
- Views: 485
Re: N value
You have to balance the reduction and oxidation half reactions and then see how many electrons are added in order to balance the charges. The number of electrons is the n value.
- Sun Mar 01, 2020 11:31 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: n value
- Replies: 9
- Views: 607
Re: n value
You have to balance the oxidation and reduction half reactions, and see how many electrons you have to add in order to balance it. That number is n.
- Sun Mar 01, 2020 11:28 pm
- Forum: Balancing Redox Reactions
- Topic: Acidic and Basic Reactions
- Replies: 9
- Views: 518
Re: Acidic and Basic Reactions
You add H20 to balance the oxygens in both types of reaction. Use H+ to balance the hydrogens in an acidic solution and OH- to balance hydrogens in a basic solution.
- Sun Mar 01, 2020 11:26 pm
- Forum: Balancing Redox Reactions
- Topic: Cell Diagrams
- Replies: 2
- Views: 232
Re: Cell Diagrams
I think that is correct, and you use commas to separate different species that have the same phase.
- Sun Mar 01, 2020 11:24 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Notation
- Replies: 4
- Views: 489
Re: Cell Notation
H2O is a solvent so it is not important to include in the cell diagram because it is assumed that you have an abundance of it.
- Sun Mar 01, 2020 11:22 pm
- Forum: Balancing Redox Reactions
- Topic: Reducing Agent
- Replies: 5
- Views: 430
Re: Reducing Agent
Yes, because for something to be a reducing agent it has to give away an electron to another species, which ends up reducing it, and vice for oxidizing agents.
- Sun Feb 23, 2020 11:29 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Difference
- Replies: 5
- Views: 350
Re: Difference
This delta G is based off of knowing the delta H and delta S.
- Sun Feb 23, 2020 11:26 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: State
- Replies: 5
- Views: 400
Re: State
It is usually given in the problem or the equation unless it is something obvious like oxygen gas.
- Sun Feb 23, 2020 11:24 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagrams
- Replies: 4
- Views: 321
Re: Cell Diagrams
Platinum can be used to transfer electrons if there is no other conducting solid.
- Sun Feb 23, 2020 11:21 pm
- Forum: Balancing Redox Reactions
- Topic: Potential Difference
- Replies: 5
- Views: 442
Re: Potential Difference
Potential difference is the energy in volts needed to change an electrical charge.
- Sun Feb 23, 2020 11:17 pm
- Forum: Balancing Redox Reactions
- Topic: Test 2 Topics
- Replies: 7
- Views: 515
Re: Test 2 Topics
Test 2 includes the end of outline 4 and all of outline 5 (Electrochemistry) which I think will be covered during week 8.
- Sun Feb 23, 2020 11:15 pm
- Forum: Balancing Redox Reactions
- Topic: Reduced/Oxidized
- Replies: 5
- Views: 363
Re: Reduced/Oxidized
You would have to balance the charges of all the molecules in the equation and see which ones lose electrons making the oxidized and which ones gain electrons making them reduced.
- Sun Feb 16, 2020 11:25 pm
- Forum: Balancing Redox Reactions
- Topic: oxidation number
- Replies: 10
- Views: 778
Re: oxidation number
You have to check the known charges of the ions and make sure that they balance out for the entire equation.
- Sun Feb 16, 2020 11:24 pm
- Forum: Balancing Redox Reactions
- Topic: Rules for oxidation numbers
- Replies: 6
- Views: 348
Re: Rules for oxidation numbers
Ions have a different number of electrons and protons, so they will have a charge depending on that difference.
- Sun Feb 16, 2020 11:23 pm
- Forum: Van't Hoff Equation
- Topic: Van't Hoff Equation
- Replies: 3
- Views: 199
Re: Van't Hoff Equation
This equation can be used to calculate the equilibrium constant when the temperature and delta G are known. This helps to compare K at different temperatures.
- Sun Feb 16, 2020 11:20 pm
- Forum: Van't Hoff Equation
- Topic: T1 and T2
- Replies: 7
- Views: 571
Re: T1 and T2
This equation lets you solve for K at different temperatures, so it can show you the change in the equilibrium constant between T1 and T2.
- Sun Feb 16, 2020 11:19 pm
- Forum: Van't Hoff Equation
- Topic: Van't Hoff Equation
- Replies: 3
- Views: 329
Re: Van't Hoff Equation
This equation lets you solve for K if you have delta G and the temperature. It can also be used to calculate K at a different temperature if delta H is known by setting delta G equal to delta H minus T delta S.
- Sun Feb 16, 2020 11:15 pm
- Forum: Van't Hoff Equation
- Topic: Equilibrium Constant
- Replies: 4
- Views: 312
Re: Equilibrium Constant
If delta G is zero then that means the reaction is at equilibrium. So Q must be equal to the equilibrium constant K.
- Sun Feb 16, 2020 11:10 pm
- Forum: Balancing Redox Reactions
- Topic: Why do we split equations?
- Replies: 12
- Views: 810
Re: Why do we split equations?
It makes it easier to understand which atoms are losing electrons and which are gaining electrons in the reaction.
- Sun Feb 09, 2020 11:31 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Sudden vs. Gradual
- Replies: 3
- Views: 262
Re: Sudden vs. Gradual
Sudden expansion represents irreversible reactions while a gradual expansion represents a reversible expansion because of the small gradual expansion that allows for the most work to happen.
- Sun Feb 09, 2020 11:26 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Heat capacity
- Replies: 6
- Views: 275
Re: Heat capacity
Monoatomic particles have a heat capacity of 3/2 R. For liner molecules it is 5/2 R because there are more possible positions for the molecule.
- Sun Feb 09, 2020 11:24 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Entropy Surroundings
- Replies: 4
- Views: 236
Re: Entropy Surroundings
The change in temperature would be when there is no heat or pressure.
- Sun Feb 09, 2020 11:21 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Standard reaction enthalpy
- Replies: 2
- Views: 69
Re: Standard reaction enthalpy
You can use either, both are correct it just depends on what is given.
- Sun Feb 09, 2020 11:19 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Difference between Cv and Cp?
- Replies: 8
- Views: 530
Re: Difference between Cv and Cp?
Cv is 3/2 R and is used under constant volume and Cp is 5/2 R and is used under constant pressure.
- Sun Feb 02, 2020 11:44 pm
- Forum: Phase Changes & Related Calculations
- Topic: Calorimeters
- Replies: 8
- Views: 463
Re: Calorimeters
It only matters if it is a bomb calorimeters instead of a regular calorimeter.
- Sun Feb 02, 2020 11:42 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Hess's Law
- Replies: 4
- Views: 287
Re: Hess's Law
You have to make sure all of the products and reactants cancel out by flipping some of the equations and changing the sign. Then you can add all the enthalpies.
- Sun Feb 02, 2020 11:41 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Forming bonds
- Replies: 8
- Views: 216
Re: Forming bonds
Forming bonds is exothermic because it releases energy, while breaking bonds requires an input of energy so it is endothermic.
- Sun Feb 02, 2020 11:40 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: thermochemistry equations
- Replies: 5
- Views: 276
Re: thermochemistry equations
Most of them are on the constants sheet and are given during the test.
- Sun Feb 02, 2020 11:38 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: qp = ΔH?
- Replies: 5
- Views: 358
Re: qp = ΔH?
This is true when the pressure is constant.
- Sun Feb 02, 2020 11:37 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Delta H and U
- Replies: 3
- Views: 118
Re: Delta H and U
H stands for enthalpy and U is for internal energy.
- Sun Jan 26, 2020 11:58 pm
- Forum: Phase Changes & Related Calculations
- Topic: Hess's Law
- Replies: 5
- Views: 173
Re: Hess's Law
Enthalpy is a state function, meaning that only the beginning and endpoints matter, not the path taken or the intermediate values. For this reason enthalpy is additive.
- Sun Jan 26, 2020 11:56 pm
- Forum: Phase Changes & Related Calculations
- Topic: Temp. of sample
- Replies: 4
- Views: 114
Re: Temp. of sample
The energy is being used to change the state of matter for that period of time instead of to increase the temperature.
- Sun Jan 26, 2020 11:55 pm
- Forum: Phase Changes & Related Calculations
- Topic: State Function
- Replies: 3
- Views: 102
Re: State Function
Enthalpy is additive because only the end value matters, not the actual pathway taken, no those values can be added.
- Sun Jan 26, 2020 11:28 pm
- Forum: Phase Changes & Related Calculations
- Topic: Test 1
- Replies: 6
- Views: 231
Re: Test 1
I think we might get them back in discussions next, but it might be later.
- Sun Jan 26, 2020 11:27 pm
- Forum: Phase Changes & Related Calculations
- Topic: ∆H
- Replies: 17
- Views: 668
Re: ∆H
I think that it is, unless you know whether the reaction releases energy or requires it.
- Sun Jan 19, 2020 11:09 pm
- Forum: Ideal Gases
- Topic: Ideal gas law and [P]/[R]
- Replies: 3
- Views: 142
Re: Ideal gas law and [P]/[R]
You use it to convert between pressure and concentration since concentration is (n/V).
- Sun Jan 19, 2020 11:07 pm
- Forum: Ideal Gases
- Topic: Using PV=nRT
- Replies: 7
- Views: 220
Re: Using PV=nRT
Yes you can use it find find pressure if you have the molarity (n/V) or vice versa.
- Sun Jan 19, 2020 11:04 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: exothermic/endothermic rxns
- Replies: 4
- Views: 172
Re: exothermic/endothermic rxns
Exothermic reactions release energy, so energy is basically one of the products. Endothermic reactions require energy so energy is a reactant. So when you increase energy it favors the other side.
- Sun Jan 19, 2020 11:03 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: lewis structure
- Replies: 11
- Views: 467
Re: lewis structure
I think you needs to understand how the protons or electron pairs are transferred, but you do not actually have to draw it.
- Sun Jan 19, 2020 11:02 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: temperature
- Replies: 10
- Views: 455
Re: temperature
Temperature is the only thing that affects the equilibrium constant, so it changes the value of k.
- Sun Jan 19, 2020 11:01 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: pKa and pKb
- Replies: 17
- Views: 924
Re: pKa and pKb
These are just logarithmic versions of Ka and Kb, their relationship is that they add up to 14.
- Sun Jan 12, 2020 11:05 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Partial Pressure
- Replies: 3
- Views: 153
Re: Partial Pressure
I don't think you could calculate that without being given the temperature.
- Sun Jan 12, 2020 11:03 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: The concept of Gibbs Free Energy
- Replies: 4
- Views: 224
Re: The concept of Gibbs Free Energy
Gibbs free energy can help determine whether a reaction release or requires energy. I think this will be important later in the class but not much for this unit.
- Sun Jan 12, 2020 11:00 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: pressure and volume
- Replies: 4
- Views: 150
Re: pressure and volume
Pressure and volume have an inverse relationship. When a gas is condenses into a smaller space the pressure increases, and when the gas has more space the pressure decreases.
- Sun Jan 12, 2020 10:56 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Concentration
- Replies: 6
- Views: 248
Re: Concentration
You do use units for concentration, but not the equilibrium constant because the units of products over reactants cancel out.
- Sun Jan 12, 2020 5:22 pm
- Forum: Ideal Gases
- Topic: ICE tables
- Replies: 4
- Views: 323
Re: ICE tables
An ICE table has three rows in which you list the Initial molar concentration, Change in molar concentration, and Equilibrium molar concentration for all of the products and reactants. It can be used to determine the concentration of the equilibrium mixture.
- Sun Dec 08, 2019 12:32 am
- Forum: Naming
- Topic: Abbreviations
- Replies: 6
- Views: 636
Re: Abbreviations
I think all of these abbreviations are okay for the final.
- Sun Dec 08, 2019 12:31 am
- Forum: Naming
- Topic: bis- tris- tetrakis-
- Replies: 8
- Views: 630
Re: bis- tris- tetrakis-
You use these prefixes any time it is polydentate, so you would use it for oxalato, en, dien, and edta.
- Sun Dec 08, 2019 12:30 am
- Forum: Naming
- Topic: Ferrate and Cuprate? [ENDORSED]
- Replies: 5
- Views: 551
Re: Ferrate and Cuprate? [ENDORSED]
If the complex is negative you have to add -ate to the end of the metal. The only exception is iron and copper, which change to ferrate and cuprate.
- Sun Dec 08, 2019 12:27 am
- Forum: Biological Examples
- Topic: Coordination Compounds
- Replies: 2
- Views: 108
Re: Coordination Compounds
I think you need to memorize all of the ones given on the list in his website.
- Sun Dec 08, 2019 12:26 am
- Forum: Biological Examples
- Topic: Polydentate
- Replies: 3
- Views: 142
Re: Polydentate
Polydentate just means that it bonds at more than one site, hexadentate says the actual number of bonds it can make. Both are correct though.
- Sun Dec 08, 2019 12:25 am
- Forum: Biological Examples
- Topic: Hemoglobin
- Replies: 4
- Views: 360
Re: Hemoglobin
Four myoglobin create a hemoglobin, and each myoglobin can carry one oxygen. So total 4 can be carried by a hemoglobin.
- Sun Dec 08, 2019 12:24 am
- Forum: Biological Examples
- Topic: Hydrogen Bonding sites
- Replies: 11
- Views: 795
Re: Hydrogen Bonding sites
Any hydrogen attached to a F, O , or N , and any lone pairs on those atoms can make hydrogen bonds.
- Sun Dec 08, 2019 12:22 am
- Forum: Biological Examples
- Topic: Cisplatin
- Replies: 5
- Views: 531
Re: Cisplatin
The chlorines are on the same side and bind to DNA twice, which stops cell division.
- Sun Dec 01, 2019 7:31 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: sigma bond
- Replies: 11
- Views: 759
Re: sigma bond
A sigma bond is a bond between two orbitals (s and s, s and p, etc) where they overlap end to end and can rotate.
- Sun Dec 01, 2019 7:28 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Fundamentals
- Replies: 5
- Views: 514
Re: Fundamentals
I am not sure but I don't think we need to know bond order.
- Sun Dec 01, 2019 7:27 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Content of the final
- Replies: 11
- Views: 1019
Re: Content of the final
I don't think molecular orbital theory or bond order will be on it.
- Sun Dec 01, 2019 7:25 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Diamagnetism and Paramagnetism
- Replies: 2
- Views: 260
Diamagnetism and Paramagnetism
What is the difference between diamagnetism and paramagnetism?
- Sun Dec 01, 2019 7:22 pm
- Forum: Hybridization
- Topic: Hybridization
- Replies: 7
- Views: 368
Re: Hybridization
I think that's all. You just need to memorize the hybrid orbitals.
- Sun Dec 01, 2019 7:19 pm
- Forum: Hybridization
- Topic: Hybridization and Orbital Shape
- Replies: 2
- Views: 133
Re: Hybridization and Orbital Shape
Hybridization of two orbitals changes the shape because they combine to share electrons and become a different shape.
- Sun Nov 24, 2019 5:24 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Specific Naming Question
- Replies: 4
- Views: 319
Re: Specific Naming Question
If it asks for the shape, then you have to say see-saw. If it asks for the electron geometry as well then it is trigonal bipyramid.
- Sun Nov 24, 2019 5:22 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent vs linear
- Replies: 56
- Views: 4285
Re: Bent vs linear
A bent molecule has a lone pair which pushes the other atoms away from it, causing a bent shape.
- Sun Nov 24, 2019 5:20 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: sigma bond
- Replies: 11
- Views: 759
Re: sigma bond
A sigma bond means that the orbitals overlap end to end. Sigma bonds also allow for rotation.
- Sun Nov 24, 2019 5:18 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Dipole Moment?
- Replies: 4
- Views: 400
Re: Dipole Moment?
If the molecule has symmetry then the dipole moments likely will cancel out and make the overall molecule nonpolar.
- Sun Nov 24, 2019 5:16 pm
- Forum: Hybridization
- Topic: Single Electron Orbitals
- Replies: 2
- Views: 225
Re: Single Electron Orbitals
Single electrons can still form a bond.
- Sun Nov 24, 2019 5:14 pm
- Forum: Hybridization
- Topic: Sigma and Pi bonds
- Replies: 13
- Views: 716
Re: Sigma and Pi bonds
You just have to label one as a sigma bond and one a pi bond if its a double bond. If it is triple then one sigma and two pi.
- Sun Nov 17, 2019 8:18 pm
- Forum: Bond Lengths & Energies
- Topic: Polarizability
- Replies: 4
- Views: 349
Re: Polarizability
Polarizability increases with size and negative charge. So larger anions have the highest polarizability.
- Sun Nov 17, 2019 8:17 pm
- Forum: Bond Lengths & Energies
- Topic: Lone pairs
- Replies: 7
- Views: 646
Re: Lone pairs
Lone pairs are usually located in a place where they form fewer bond angles with other atoms. So in the See Saw shape they are located on the equatorial plane where they only interact with 2 bonds.
- Sun Nov 17, 2019 8:13 pm
- Forum: Bond Lengths & Energies
- Topic: 3F5 a
- Replies: 2
- Views: 227
3F5 a
Suggest, giving reasons, which substance in each of the following pairs is likely to have the higher normal melting point
(Lewis structures may help your arguments): (a) HCl or NaCl
Why is the melting point of NaCl higher that HCL?
(Lewis structures may help your arguments): (a) HCl or NaCl
Why is the melting point of NaCl higher that HCL?
- Sun Nov 17, 2019 8:10 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Repulsion strength and Bond Angles
- Replies: 12
- Views: 707
Re: Repulsion strength and Bond Angles
Yes, the lone pair repels the other bonds, causing the bond angle between them to be slightly less than what is expected.
- Sun Nov 17, 2019 8:08 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Radicals
- Replies: 5
- Views: 319
Re: Radicals
Yes, a radical with a single electron is still considered a domain for the electron geometry.
- Sun Nov 10, 2019 11:14 pm
- Forum: Dipole Moments
- Topic: Instantaneous Dipole
- Replies: 2
- Views: 147
Instantaneous Dipole
What is an instantaneous dipole and how do you identify it?
- Sun Nov 10, 2019 10:22 pm
- Forum: Dipole Moments
- Topic: Hydrogen Bonding
- Replies: 6
- Views: 442
Re: Hydrogen Bonding
They are the strongest intermolecular bonds but no stronger than ionic or covalent bonds.
- Sun Nov 10, 2019 10:20 pm
- Forum: Dipole Moments
- Topic: dipole
- Replies: 4
- Views: 242
Re: dipole
A molecule has a dipole moment if it has a partial negative a positive charge due to uneven sharing or electrons.
- Sun Nov 10, 2019 4:16 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polairzability characteristics
- Replies: 3
- Views: 233
Re: Polairzability characteristics
It is harder to break the bonds in a more polarizable atom and covert it to a liquid or gas.
- Sun Nov 10, 2019 4:14 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizability
- Replies: 4
- Views: 326
Re: Polarizability
Polarizability increases toward Francium (like atomic radius) while polarizing power increases toward Fluorine (like elecronegativity)
- Sun Nov 03, 2019 9:50 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 3
- Views: 153
Formal Charge
Do you have to calculate formal charges for every lewis structure you draw, or only if it is specified in the question.
- Sun Nov 03, 2019 9:49 pm
- Forum: Resonance Structures
- Topic: Showing resonance
- Replies: 8
- Views: 391
Re: Showing resonance
You can use the solid and dashed lines or you can draw all of the possible lewis structures and explain that the resonance is a hybrid of all of them.
- Sun Nov 03, 2019 9:46 pm
- Forum: Octet Exceptions
- Topic: Identifying Radicals
- Replies: 6
- Views: 414
Re: Identifying Radicals
I think you can usually tell it is a radical if there is an odd number of valence electrons.
- Sun Nov 03, 2019 9:43 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: formal charge
- Replies: 4
- Views: 162
Re: formal charge
Another way to think about it is FC= valence electrons - (number of lone pair electrons + number of bonds)
- Sun Nov 03, 2019 9:40 pm
- Forum: Dipole Moments
- Topic: Polarizability
- Replies: 1
- Views: 95
Polarizability
How much of polarizability do we need to know for the midterm? Thanks!
- Sun Oct 27, 2019 9:19 pm
- Forum: Dipole Moments
- Topic: Dipole Moments
- Replies: 2
- Views: 151
Dipole Moments
How do you determine if there is a dipole moment, and what exactly causes it?
- Sun Oct 27, 2019 9:17 pm
- Forum: Octet Exceptions
- Topic: octet exceptions
- Replies: 5
- Views: 297
Re: octet exceptions
It also helps to know that exceptions are in the third period because they can fill their d orbital with electrons as well.
- Sun Oct 27, 2019 9:09 pm
- Forum: Resonance Structures
- Topic: Octet
- Replies: 13
- Views: 850
Re: Octet
Atoms like P, S, and Cl also can be an exception because they can accommodate more than 8 valence electrons.
- Sun Oct 27, 2019 9:06 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization Energy
- Replies: 9
- Views: 408
Re: Ionization Energy
Ionization energy is always positive because you need energy to remove the electron. Second ionization energy is higher because the charge difference between the positive nucleus and the electrons is greater, so it is even more difficult to remove another electron.
- Sat Oct 26, 2019 1:20 am
- Forum: Resonance Structures
- Topic: Bond Lengths
- Replies: 5
- Views: 636
Re: Bond Lengths
The resonance structure is a blend of the different possible lewis structures of a molecule. The bond lengths of the resonance structure will all be the same and will be somewhere between the lengths of all the possible bonds.
- Sun Oct 20, 2019 10:02 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Paired & Parallel Electrons
- Replies: 4
- Views: 183
Re: Paired & Parallel Electrons
Parallel electrons have the same spin and will have the same sign for the spin magnetic quantum number while paired electrons have opposite spins so one will have a negative spin magnetic QN will the other will be positive.
- Sun Oct 20, 2019 9:48 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configuration Rules
- Replies: 3
- Views: 151
Electron Configuration Rules
Why is the electron configuration for Chromium [Ar] 3d5 4s1? Can someone please explain the exceptions to electron configuration rules?
- Sun Oct 20, 2019 9:42 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Quantum Number
- Replies: 4
- Views: 205
Re: Quantum Number
Yes I think you need to know them for the s, p, d, and f orbitals.
- Sun Oct 20, 2019 9:33 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Spin Quantum Number
- Replies: 3
- Views: 207
Spin Quantum Number
What is the difference between an atom having a positive spin quantum number versus a negative one?