## Search found 129 matches

Sun Mar 15, 2020 8:57 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Gibbs free energy
Replies: 8
Views: 139

### 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: 79

### 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: 79

### 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: 112

### 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: 76

### 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: 2
Views: 59

### 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: 133

### 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: 43

### 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: 118

### 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: 39

### 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: 25

### 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: 16
Views: 174

### 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: 111

### 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: 27

### 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: 64

### 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: 431

### 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: 40

### 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: 25

### 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: 428

### 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: 52

### 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: 51

### 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: 124

### 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: 118

### 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: 142

### 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: 155

### 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: 57

### 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: 41

### 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: 38

### 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: 47

### 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: 32

### 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: 43

### 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: 57

### 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: 46

### 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: 88

### 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: 39

### 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: 194

### 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: 62

### 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: 82

### 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: 59

### 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: 36

### 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: 300

### 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: 47
Views: 960

### 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: 41

### 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: 67

### 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: 77

### 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: 59

### 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: 56

### 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: 86

### 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: 116

### 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
Replies: 3
Views: 43

### 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: 63

### 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: 44

### 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: 62

### 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: 36

### 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: 50

### 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: 46

### 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: 66

### 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: 255

### 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: 60

### 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: 44

### 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: 41

### 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: 35

### 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: 94

### 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: 69

### 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: 175

### 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: 71

### 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: 201

### 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: 71

### 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: 64

### 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: 128

### 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: 137

### 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: 5
Views: 143

### 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: 118

### 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: 187

### 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: 4
Views: 152

### 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: 58

### 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: 67

### 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: 57

### 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: 94

### 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: 125

### 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: 41

### 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: 333

### 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: 33

### 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: 39

### 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: 39

### 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: 274

### 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: 151

### 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: 57

### 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: 22

### 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: 53

### 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: 384

### 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: 57

### 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: 47

### 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: 49

### 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: 61

### 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: 44

### 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: 67

### 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: 43

### 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: 56

### 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: 54

### Re: london forces

All molecules possess london forces due to the nature of electron interations