Search found 129 matches
- Sun Mar 15, 2020 8:57 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Gibbs free energy
- Replies: 18
- Views: 1006
Re: Gibbs free energy
standard gibbs free energy is defined for a given reaction at standard conditions but gibbs free energy is just a general measure of reaction sponteniety.
- Sun Mar 15, 2020 8:55 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Galvanic and Voltaic
- Replies: 5
- Views: 405
Re: Galvanic and Voltaic
I am pretty sure they are the same thing. There is a difference between galvanic vs electrolytic cell.
- Sun Mar 15, 2020 8:54 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Deriving the equation
- Replies: 4
- Views: 396
Re: Deriving the equation
equation 1 del G = -rtlnK equation 2 del g = -nFe*
- Sun Mar 15, 2020 8:54 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Test 2 Q6 part b ii
- Replies: 5
- Views: 380
Re: Test 2 Q6 part b ii
Mass doesn't affect the overall reaction.
- Sun Mar 15, 2020 8:53 pm
- Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
- Topic: Glass Electrode
- Replies: 5
- Views: 386
Re: Glass Electrode
A special type of electrode not made of metal. i think its used in pH meter.
- Sun Mar 15, 2020 8:52 pm
- Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
- Topic: Concentrations
- Replies: 8
- Views: 639
Re: Concentrations
Related by E=E* - RT/fnln(conc cathode/conc anode) although depends on problem.
- Sun Mar 08, 2020 11:52 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: linear plots
- Replies: 7
- Views: 526
Re: linear plots
Know how the first order second and zero order plots look like and how they relate the [a] and time
- Sun Mar 08, 2020 11:48 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: K’
- Replies: 4
- Views: 332
Re: K’
k' is called "k prime" and refers to the reverse reaction.
- Sun Mar 08, 2020 11:48 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Exothermic vs. Endothermic
- Replies: 14
- Views: 919
Re: Exothermic vs. Endothermic
Exothermic reactions will have reactants higher than products and vice versa for endothermic.
- Sun Mar 08, 2020 11:47 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Energy Barrier
- Replies: 4
- Views: 269
Re: Energy Barrier
I don't believe the energy graph necessarily provides information on the slow step but I could be wrong.
- Sun Mar 08, 2020 11:46 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: microscopic reversibility
- Replies: 3
- Views: 235
Re: microscopic reversibility
Microscopic reversibilty refers to the reactions having the same intermediates in the forward and reverse reactions.
- Sun Mar 08, 2020 11:45 pm
- Forum: Second Order Reactions
- Topic: [A] v. Time
- Replies: 27
- Views: 1140
Re: [A] v. Time
Linear 1/[A] v time but not [A] v time
- Sun Mar 08, 2020 11:43 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: intergrated rate law
- Replies: 9
- Views: 621
Re: intergrated rate law
It will probably best to understand how they are derived as he may ask you that on the final.
- Sun Mar 08, 2020 11:42 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Microscopic Reversibility
- Replies: 3
- Views: 224
Re: Microscopic Reversibility
Same intermediates in both forward and reverse directions as some reactions will not have the same intermediates one way as another.
- Sun Mar 08, 2020 11:41 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: temperature and k
- Replies: 5
- Views: 400
Re: temperature and k
I believe you are refering to lower case k so it will increase with temp as more collisions
- Sun Mar 08, 2020 11:40 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: units of T
- Replies: 11
- Views: 1025
Re: units of T
I believe it is good practice to change to seconds but depends on context.
- Sun Mar 08, 2020 11:38 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: how?
- Replies: 3
- Views: 298
Re: how?
Initial rates is an experimental technique in which multiple reactions are observed the only difference being initial concetrations.
- Sun Mar 08, 2020 11:37 pm
- Forum: Zero Order Reactions
- Topic: Half life of zero order runs
- Replies: 3
- Views: 262
Re: Half life of zero order runs
Plot is linear because reaction rate is constant so linear relationship.
- Sun Mar 08, 2020 11:35 pm
- Forum: Zero Order Reactions
- Topic: Not used Half life
- Replies: 8
- Views: 914
Re: Not used Half life
Half life of zero order is[ initial concentration / 2 * k]
- Sun Mar 08, 2020 11:34 pm
- Forum: Zero Order Reactions
- Topic: examples of zero order reactions?
- Replies: 6
- Views: 481
Re: examples of zero order reactions?
A zero order reaction just has a constant and independent reaction rate
- Sun Mar 08, 2020 11:31 pm
- Forum: General Rate Laws
- Topic: First vs Second vs Zero Order
- Replies: 7
- Views: 560
Re: First vs Second vs Zero Order
First vs second vs zero order laws determine relationship between input and output (input usually being time). first order reactions are natural log relationship, second order are recipricol relationship, and zero order have linear relationship.
- Sun Feb 23, 2020 11:53 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagrams
- Replies: 9
- Views: 564
Re: Cell Diagrams
, for species in same phase, | for species in different phase, || salt bridge or porous disk
- Sun Feb 23, 2020 11:51 pm
- Forum: Balancing Redox Reactions
- Topic: Reduction?
- Replies: 13
- Views: 617
Re: Reduction?
Reduction corresponds to the part of the reactions gaining an electron.
- Sun Feb 23, 2020 11:50 pm
- Forum: Balancing Redox Reactions
- Topic: spontaneous
- Replies: 15
- Views: 757
Re: spontaneous
Positive SRP is equivalent to negative delta G so it will be spontaneous.
- Sun Feb 23, 2020 11:49 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: STP
- Replies: 13
- Views: 705
Re: STP
1 atm and 273.15 K or 0 C
- Sun Feb 23, 2020 11:48 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Difference in phases
- Replies: 5
- Views: 301
Re: Difference in phases
Difference in phase of the species, for instance (aq) vs (s)
- Sun Feb 23, 2020 11:47 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Convention for cell diagrams
- Replies: 3
- Views: 206
Re: Convention for cell diagrams
I believe you should just know to place the electrodes (anode and cathode) at the ends of the diagram.
- Sun Feb 23, 2020 11:46 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Platinum
- Replies: 4
- Views: 271
Re: Platinum
Platinum is the best inert conductor so it doesn't oxidize
- Sun Feb 23, 2020 11:45 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: ampere and coulomb?
- Replies: 4
- Views: 285
Re: ampere and coulomb?
The Coloumb is equivalent to the charge in an arbitrary number electrons and Ampere is that charge per second
- Sun Feb 23, 2020 11:44 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Porous disk
- Replies: 3
- Views: 207
Re: Porous disk
I believe porous disks and salt bridges are notated in the same way as they achieve the same end goal.
- Sun Feb 23, 2020 11:42 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: | divider in cell diagram
- Replies: 5
- Views: 329
Re: | divider in cell diagram
Both are aqueous so the convention is to separate by comma
- Sun Feb 23, 2020 11:42 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Positive or Negative Sign
- Replies: 4
- Views: 277
Re: Positive or Negative Sign
The cell potential is given in reduction form so switch if oxidization is occuring.
- Sun Feb 23, 2020 11:41 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Balancing Equations
- Replies: 5
- Views: 359
Re: Balancing Equations
Look at both sides of the equation and determine which species is gaining electons and which is losing and that should tell you which is being oxidized and which is reduced.
- Sun Feb 23, 2020 11:39 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: salt bridge
- Replies: 9
- Views: 625
Re: salt bridge
Electrons need to go back to anode side to maintain reactions.
- Sun Feb 23, 2020 11:38 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: State
- Replies: 5
- Views: 346
Re: State
Depends on the context of the problem, however it should be given (aq) (g) (s) (l)
- Sun Feb 23, 2020 11:38 pm
- Forum: Balancing Redox Reactions
- Topic: Half reactions
- Replies: 17
- Views: 827
Re: Half reactions
Half reactions refer to the splitting of a redox reaction into its components based solely on the movement of electrons. A half reaction is balanced when both sides have the same number of electrons.
- Sun Feb 09, 2020 11:32 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Microstates
- Replies: 6
- Views: 231
Re: Microstates
There are multiple factors that contribute to higher multiple micro states but complexity is one of them. if you increase the number of bonds you are therefore increasing complexity increasing entropy. Although this differs in the case of going from two substances to one larger more complex molecule.
- Sun Feb 09, 2020 11:29 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Reversible Reactions vs. Irreversible Reactions
- Replies: 6
- Views: 258
Re: Reversible Reactions vs. Irreversible Reactions
Yes I think so. The Irreversible graph is always straight and the Reversible graph is curved starting at a higher pressure and with a negative slope
- Sun Feb 09, 2020 11:27 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Cp v.Cv
- Replies: 6
- Views: 303
Re: Cp v.Cv
In every question in the HW it is stated whether constant pressure or constant volume is occurring. if constant pressure 5/2R and constant Volume is 3/2R
- Sun Feb 09, 2020 11:25 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Entropy of a close
- Replies: 2
- Views: 125
Re: Entropy of a close
Take the case of a system losing heat q to surroundings at a lower temperature. The absolute value of entropy for Surroundings at lower temperature will always be greater than for the system because the denominator will always be smaller in q/T for same q
- Sun Feb 09, 2020 11:22 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Intensive vs. Extensive
- Replies: 15
- Views: 1295
Re: Intensive vs. Extensive
Intensive property do not care for quantity. For instance Density is intensive as it will be unchanged regardless of amount of material. This is the opposite for Extensive property such as mass.
- Sun Feb 09, 2020 11:21 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Kelvin or Celsius?
- Replies: 86
- Views: 5172
Re: Kelvin or Celsius?
Kelvin... The gas constant R is listed in Kelvin so Kelvin is used in equation.
- Fri Feb 07, 2020 12:36 am
- Forum: Calculating Work of Expansion
- Topic: Reversible process and greatest work
- Replies: 5
- Views: 160
Re: Reversible process and greatest work
If you look at the graphs in the textbook it is clear that the reversible formula gives much more area and there for a greater value for integral than the irreversible formula which just is a rectangle. It has to do with the math of the curve vs straight line
- Fri Feb 07, 2020 12:31 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Cp/Cv
- Replies: 7
- Views: 359
Re: Cp/Cv
constant pressure is assumed unless otherwise specified as we have the equation nRT ln(v2/v1) assumes constant pressure
- Fri Feb 07, 2020 12:29 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: ∆U and ∆H
- Replies: 6
- Views: 255
Re: ∆U and ∆H
delta u = delta H + work. You can use this relationship to calculate any of the three values in the equation.
- Fri Feb 07, 2020 12:28 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Textbook question 4A.13
- Replies: 5
- Views: 137
Re: Textbook question 4A.13
If a reaction is exothermic it loses heat to surroundings so the change must be negative. I think you are getting value for calorimeter not system.
- Fri Feb 07, 2020 12:25 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Bond Enthalpies
- Replies: 4
- Views: 121
Re: Bond Enthalpies
I may be misunderstanding your question however you do not need to include bond enthalpies for bonds that are not broken in a reaction, ie 3C2H2 -> C6H6 do not need H - C bond enthalpies because they are not broken
- Fri Feb 07, 2020 12:23 am
- Forum: Phase Changes & Related Calculations
- Topic: Heating Curve Phase Changes
- Replies: 11
- Views: 579
Re: Heating Curve Phase Changes
It is flat because the addition of energy as heat into the system causes the substance to fully change phases before increasing the temperature of the substance.
- Mon Jan 27, 2020 12:12 am
- Forum: Phase Changes & Related Calculations
- Topic: Steam Burns
- Replies: 9
- Views: 627
Re: Steam Burns
Steam undergo's a phase change thus releasing more energy while water liquid doesn't.
- Mon Jan 27, 2020 12:11 am
- Forum: Phase Changes & Related Calculations
- Topic: Why is enthalpy additive?
- Replies: 3
- Views: 126
Re: Why is enthalpy additive?
Short answer is the intermediates don't matter as its a state function.
- Mon Jan 27, 2020 12:10 am
- Forum: Phase Changes & Related Calculations
- Topic: Enthalpy w/ Temp
- Replies: 6
- Views: 174
Re: Enthalpy w/ Temp
Enthalpy is listed as h as with other examples if it is negative it is exothermic and vice versa
- Mon Jan 27, 2020 12:07 am
- Forum: Phase Changes & Related Calculations
- Topic: Heat vs. Enthalpy
- Replies: 6
- Views: 149
Re: Heat vs. Enthalpy
heat released is a factor when calculating enthalpy for a given system.
- Mon Jan 27, 2020 12:06 am
- Forum: Phase Changes & Related Calculations
- Topic: Physical or Phase Changes
- Replies: 7
- Views: 155
Re: Physical or Phase Changes
There is no indication that we would be required to calculate any thing like that so we will need it given to us.
- Mon Jan 27, 2020 12:04 am
- Forum: Phase Changes & Related Calculations
- Topic: Enthalpy of Vaporization and Fusion
- Replies: 5
- Views: 133
Re: Enthalpy of Vaporization and Fusion
Solid to liquid is relatively low energy but liquid to gas is much higher.
- Mon Jan 27, 2020 12:03 am
- Forum: Phase Changes & Related Calculations
- Topic: revere reactions
- Replies: 7
- Views: 150
Re: revere reactions
Going up a phase is akin to going up in energy levels so the correlation works both ways.
- Mon Jan 27, 2020 12:02 am
- Forum: Phase Changes & Related Calculations
- Topic: Combustion
- Replies: 5
- Views: 140
Re: Combustion
Combustion is more specific than those general classes of reactions.
- Mon Jan 27, 2020 12:01 am
- Forum: Phase Changes & Related Calculations
- Topic: Combustion vs. Cellular Respiration
- Replies: 5
- Views: 227
Re: Combustion vs. Cellular Respiration
Enthalpy would be the same, but the energy is released in different forms.
- Sun Jan 26, 2020 11:49 pm
- Forum: Phase Changes & Related Calculations
- Topic: Why does steam cause burns?
- Replies: 29
- Views: 1111
Re: Why does steam cause burns?
Steam will have to undergo phase change so it releases much more kJ of energy than liquid which doesn't phase change.
- Sun Jan 26, 2020 11:47 pm
- Forum: Phase Changes & Related Calculations
- Topic: Hess's Law
- Replies: 8
- Views: 168
Re: Hess's Law
It has to do with state functions and how they relate to enthalpy, as enthalpy is not determined by path taken.
- Sun Jan 26, 2020 11:45 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: 3 methods
- Replies: 5
- Views: 115
Re: 3 methods
Depends on given info but bond enthalpies method least accurate
- Sun Jan 26, 2020 11:44 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Different Enthalpy Strategies
- Replies: 5
- Views: 160
Re: Different Enthalpy Strategies
Lavelle said that the bond enthalpies is the easiest but least accurate. Therefore I feel like he doesn't want us to use that.
- Sun Jan 26, 2020 11:43 pm
- Forum: Phase Changes & Related Calculations
- Topic: Differentiating (q) and (w)
- Replies: 4
- Views: 170
Re: Differentiating (q) and (w)
Heat is the energy that is released while work is the amount energy required to perform a certain task.
- Sun Jan 12, 2020 11:51 pm
- Forum: Ideal Gases
- Topic: Q vs. K
- Replies: 10
- Views: 279
Re: Q vs. K
Q is basically calculated the same way as K but can be calculated at any point in a reaction not just during equilibrium
- Sun Jan 12, 2020 11:50 pm
- Forum: Ideal Gases
- Topic: partial pressures
- Replies: 7
- Views: 218
Re: partial pressures
The second part ratio represents K and K will be the same regardless of quantity
- Sun Jan 12, 2020 11:49 pm
- Forum: Ideal Gases
- Topic: Understanding Q
- Replies: 19
- Views: 679
Re: Understanding Q
Q is calculated the same exact way as K just it can be anytime during reaction not just during equilibrium
- Sun Jan 12, 2020 11:48 pm
- Forum: Ideal Gases
- Topic: Kc vs Kp
- Replies: 5
- Views: 272
Re: Kc vs Kp
Kc = Concentrions Kp = Partial Pressures. If given partial pressures use Kp and vice versa. This will tell you state of materials
- Sun Jan 12, 2020 11:46 pm
- Forum: Ideal Gases
- Topic: Le Chatelier's Principle
- Replies: 7
- Views: 441
Re: Le Chatelier's Principle
Le Chateliers principle is basically the idea that a chemical reaction will adjust to maintain chemical equilibrium. For instance if you remove product more product is produced to maintain the equilibrium
- Sun Jan 12, 2020 11:45 pm
- Forum: Ideal Gases
- Topic: The Laws
- Replies: 7
- Views: 190
Re: The Laws
I mean so far we have covered the ideal gas law/equation but we will probably learn more. PV=nRT
- Sun Dec 08, 2019 12:14 am
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Alkaline vs. acidic solutions
- Replies: 2
- Views: 142
Re: Alkaline vs. acidic solutions
When the pH is lower than pKa the H+ will associate with conjugate base again... if pH is higher than pKa then H+ will disassociate.
- Sun Dec 08, 2019 12:12 am
- Forum: Amphoteric Compounds
- Topic: 6A.17
- Replies: 4
- Views: 364
Re: 6A.17
Lavelle said that nonmetal oxides usually form acidic solutions
- Sun Dec 08, 2019 12:09 am
- Forum: Identifying Acidic & Basic Salts
- Topic: Identifying Acidic and Basic Salts
- Replies: 3
- Views: 282
Re: Identifying Acidic and Basic Salts
There is a whole section in the Textbook dedicated to the helpful rules... You might find that helpful
- Sun Dec 08, 2019 12:08 am
- Forum: Polyprotic Acids & Bases
- Topic: How can you tell if an acid/base is polyprotic?
- Replies: 6
- Views: 941
Re: How can you tell if an acid/base is polyprotic?
Molecules that have more than H+ tend to be polyprotic more often than not, especially when in the front of the name ie H2S04
- Sun Dec 08, 2019 12:07 am
- Forum: Identifying Acidic & Basic Salts
- Topic: weak bases produce acidic solutions?
- Replies: 3
- Views: 309
Re: weak bases produce acidic solutions?
Weak bases and strong acids produce acidic solutions and vice versa
- Sun Dec 08, 2019 12:04 am
- Forum: Calculating the pH of Salt Solutions
- Topic: 6D.11 [ENDORSED]
- Replies: 2
- Views: 327
Re: 6D.11 [ENDORSED]
Transition Metal cations form complexes that deprotanate some molecules leaving free H+ in the solution as H3O
- Sun Dec 08, 2019 12:00 am
- Forum: Air Pollution & Acid Rain
- Topic: acid rain
- Replies: 5
- Views: 455
Re: acid rain
Understand the reasons behind its creation and the different molecules involved
- Sun Dec 01, 2019 11:33 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: bronsted acid
- Replies: 5
- Views: 268
Re: bronsted acid
Donating a proton is a Bronsted Acid, Accepting a proton is a bronsted base.
- Sun Dec 01, 2019 11:32 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Relative Acidity
- Replies: 4
- Views: 229
Re: Relative Acidity
Delocalization of electrons lessens the instability caused by having one area of lone pair electrons spreading this out helps.
- Sun Dec 01, 2019 11:31 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: electronegativity
- Replies: 4
- Views: 140
Re: electronegativity
Periodic trends say that the closer to fluorine an atom is the more electro negative.
- Sun Dec 01, 2019 11:27 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Strength of Acids - Example from Lecture
- Replies: 6
- Views: 444
Re: Strength of Acids - Example from Lecture
Draw the Lewis structure and see that the Cl form a ring around central carbon and then the lone pairs on the Cl pull on the Oxygen delocalizing the electrons which increases stability.
- Sun Dec 01, 2019 11:23 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: The pH Scale
- Replies: 7
- Views: 473
Re: The pH Scale
Know the how to calculate the pH ie -log() and pOH and know how to interpret results
- Sun Dec 01, 2019 11:21 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Acid and water
- Replies: 2
- Views: 114
Re: Acid and water
The acid "donates" a H+ to to the surrounding H2O and forms H3O+. To get pH take negative log of the H+/H3O+ (They will be the same)
- Wed Nov 27, 2019 2:34 am
- Forum: Hybridization
- Topic: Hybridization of PF5
- Replies: 4
- Views: 1961
Re: Hybridization of PF5
Sp3 four regions of electron density
- Wed Nov 27, 2019 2:33 am
- Forum: Hybridization
- Topic: 2F.15
- Replies: 3
- Views: 157
Re: 2F.15
Bond angle increases with more s character... Sp2 has more than Sp3 etc
- Wed Nov 27, 2019 2:32 am
- Forum: Hybridization
- Topic: Bond angle/s character
- Replies: 3
- Views: 261
Re: Bond angle/s character
Sp3 has less s character than sp2 so so will have more than sp2... This means the bond angle will increase as a trend
- Wed Nov 27, 2019 2:31 am
- Forum: Hybridization
- Topic: Composition of each bond
- Replies: 2
- Views: 190
Re: Composition of each bond
Be able to identify the bonds
- Wed Nov 27, 2019 2:29 am
- Forum: Hybridization
- Topic: sigma or pi?
- Replies: 20
- Views: 1092
Re: sigma or pi?
If a Lewis structure includes a double bond it will have a pi bond in the double bond
- Wed Nov 27, 2019 2:28 am
- Forum: Hybridization
- Topic: Sigma and Pi Bonds
- Replies: 21
- Views: 941
Re: Sigma and Pi Bonds
Sigma bonds allow rotation as they have one axis of connection whereas pi bonds have two.
- Mon Nov 18, 2019 10:57 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone Pairs
- Replies: 3
- Views: 131
Re: Lone Pairs
They have much stronger repulsion that lone pair bonding or bonding orbitals thus they take up more space or rather push the other bonds away
- Mon Nov 18, 2019 10:56 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Formal Charge
- Replies: 2
- Views: 155
Re: Formal Charge
I think you should first draw most stable lewis structure and base vespr off that
- Mon Nov 18, 2019 10:55 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Shapes
- Replies: 6
- Views: 371
Re: Shapes
I think we need to know all of the ones that are listed in the notes and in the textbook in 2E
- Mon Nov 18, 2019 10:52 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 4.5
- Replies: 4
- Views: 917
Re: 4.5
Since the lewis dot structure show a lone pair on the Cl there will be a repulsion from the lone pair causing a 120 degree bent shape.
- Mon Nov 18, 2019 10:51 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: dipole dipole
- Replies: 5
- Views: 269
Re: dipole dipole
Larger molecules i.e. Iodine will have a larger dipole moment
- Mon Nov 18, 2019 10:45 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Pi bond
- Replies: 4
- Views: 102
Re: Pi bond
Yes because the double bond does not allow rotation as it would break.
- Mon Nov 18, 2019 10:44 pm
- Forum: Hybridization
- Topic: Hybridization
- Replies: 4
- Views: 127
Re: Hybridization
Hybridization is not a bond necessarily, rather a model for how atomic orbitals of different energies fuse to form bonding orbitals
- Wed Nov 13, 2019 12:11 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Boiling and Melting Points
- Replies: 7
- Views: 488
Re: Boiling and Melting Points
Stronger bonds/interactions higher melting point
- Wed Nov 13, 2019 12:11 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Induced Dipole/ Induced Dipole
- Replies: 4
- Views: 266
Re: Induced Dipole/ Induced Dipole
They are the same as well as Van der Waals
- Wed Nov 13, 2019 12:10 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Hydrogen bonding
- Replies: 5
- Views: 247
Re: Hydrogen bonding
Hydrogen bonds occur due to the highly electro negative atoms interacting with hydrogens electrons
- Wed Nov 13, 2019 12:09 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: melting points
- Replies: 5
- Views: 171
Re: melting points
NaCl has a ionic as opposed to a covalent bond which is stronger that HCl and there for melts at a higher temp
- Wed Nov 13, 2019 12:08 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: melting points
- Replies: 6
- Views: 277
Re: melting points
H20 has rather strong hydrogen interactions that H2S does not
- Wed Nov 13, 2019 12:07 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: london forces
- Replies: 6
- Views: 270
Re: london forces
All molecules possess london forces due to the nature of electron interations