Search found 102 matches

by Jarrett Peyrefitte 2K
Mon Mar 16, 2020 2:56 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kw and other constants
Replies: 9
Views: 130

Re: Kw and other constants

The w for Kw means it is the equilibrium constant for water.

Ka times Kb is also equal to Kw, which equals to [H30+][OH-].
by Jarrett Peyrefitte 2K
Mon Mar 16, 2020 2:51 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Approximating X
Replies: 13
Views: 149

Re: Approximating X

ff the K value is smaller than 5% aka 10^-4, then x can be approximated
by Jarrett Peyrefitte 2K
Tue Mar 10, 2020 7:01 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalysts and Rate Law
Replies: 4
Views: 46

Re: Catalysts and Rate Law

Catalysis is the process of increasing the rate of a chemical reaction by adding a substance known as a catalyst
by Jarrett Peyrefitte 2K
Tue Mar 10, 2020 6:14 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Ka Kb
Replies: 11
Views: 148

Re: Ka Kb

Ka - Acids
Kb - Bases
by Jarrett Peyrefitte 2K
Tue Mar 10, 2020 6:10 pm
Forum: Student Social/Study Group
Topic: The Final
Replies: 5
Views: 202

The Final

Since UCLA officially offered finals remotely, how will the exam be now?
by Jarrett Peyrefitte 2K
Tue Mar 10, 2020 5:57 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Rate of Change
Replies: 1
Views: 25

Rate of Change

How does the rate of change of one species in a reaction relate to that of another species?
by Jarrett Peyrefitte 2K
Tue Mar 10, 2020 5:45 pm
Forum: Administrative Questions and Class Announcements
Topic: ENDGAME Review Session
Replies: 71
Views: 2746

Re: ENDGAME Review Session

Thank you King Lyndon you da best :)
by Jarrett Peyrefitte 2K
Mon Mar 09, 2020 12:05 am
Forum: Second Order Reactions
Topic: [A] v. Time
Replies: 16
Views: 174

Re: [A] v. Time

It would be linear
by Jarrett Peyrefitte 2K
Mon Mar 09, 2020 12:02 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: galvanic vs electrolytic
Replies: 12
Views: 85

Re: galvanic vs electrolytic

Electrolytic cells - non-spontaneous, convert electric energy into chemical energy
Galvanic cells - spontaneous, convert chemical energy into electric energy
by Jarrett Peyrefitte 2K
Sun Mar 08, 2020 11:54 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Exothermic vs. Endothermic
Replies: 14
Views: 118

Re: Exothermic vs. Endothermic

A reaction is exothermic when the reactants have more energy than products. Vice verso for endothermic.
by Jarrett Peyrefitte 2K
Thu Mar 05, 2020 2:21 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Standard Cell Potential and Equilibrium
Replies: 2
Views: 29

Standard Cell Potential and Equilibrium

What is the relationship between standard cell potential and equilibrium constant of a reaction?
by Jarrett Peyrefitte 2K
Wed Mar 04, 2020 5:16 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Variables
Replies: 3
Views: 40

Variables

What does each variable in the Nernst Equation represent?
by Jarrett Peyrefitte 2K
Wed Mar 04, 2020 5:15 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Concentration Cell
Replies: 7
Views: 77

Concentration Cell

What is a concentration cell? How does it work? What is an example of one?
by Jarrett Peyrefitte 2K
Sun Mar 01, 2020 10:38 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Free Energy and Cell Potential Relationship
Replies: 3
Views: 61

Free Energy and Cell Potential Relationship

What is the relationship between free energy and cell potential? What is the equation and how is it used?
by Jarrett Peyrefitte 2K
Thu Feb 27, 2020 11:11 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Work and Cell Potential Relationship
Replies: 3
Views: 38

Work and Cell Potential Relationship

What is the relationship between work and cell potential? What is the equation?
by Jarrett Peyrefitte 2K
Thu Feb 27, 2020 11:02 pm
Forum: Balancing Redox Reactions
Topic: Direction of Reaction
Replies: 3
Views: 54

Direction of Reaction

How can you predict the spontaneous direction of a reaction using standard reduction potentials?
by Jarrett Peyrefitte 2K
Wed Feb 26, 2020 4:24 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Standard Cell Potential
Replies: 3
Views: 43

Standard Cell Potential

What is a standard cell potential? How do you calculate it given the half-reactions for the cell and the standard potential?
by Jarrett Peyrefitte 2K
Tue Feb 25, 2020 5:16 pm
Forum: Balancing Redox Reactions
Topic: Chemical Equation
Replies: 1
Views: 38

Chemical Equation

Given the description of a cell, how do you write the balanced chemical equation for a redox equation?
by Jarrett Peyrefitte 2K
Tue Feb 25, 2020 5:11 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Anode and Cathode
Replies: 4
Views: 43

Anode and Cathode

What is an anode and a cathode? How do you identify the direction of flow?
by Jarrett Peyrefitte 2K
Mon Feb 24, 2020 10:47 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Electromotive Force
Replies: 3
Views: 46

Electromotive Force

What is electromotive force? Why does it represent the maximum potential difference?
by Jarrett Peyrefitte 2K
Mon Feb 24, 2020 10:44 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Galvanic/Voltaic Cells
Replies: 4
Views: 52

Galvanic/Voltaic Cells

What is a galvanic/voltaic cell? How does it work?
by Jarrett Peyrefitte 2K
Fri Feb 14, 2020 4:14 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Delta U = n*Cv,m*deltaT
Replies: 7
Views: 228

Re: Delta U = n*Cv,m*deltaT

For constant volume, Cv is used.
For constant pressure, Cp is used.
by Jarrett Peyrefitte 2K
Fri Feb 14, 2020 4:09 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Cv vs Cp
Replies: 17
Views: 275

Re: Cv vs Cp

Cv = Constant volume
Cp = Constant pressure
by Jarrett Peyrefitte 2K
Fri Feb 14, 2020 4:08 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K
Replies: 12
Views: 140

Re: K

Solids and liquids are always excluded regarding K and Q.
by Jarrett Peyrefitte 2K
Tue Feb 11, 2020 12:34 am
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Delta H and Delta S
Replies: 3
Views: 111

Delta H and Delta S

How is delta S related to delta H for a change at a constant temperature and pressure? What is their relationship?
by Jarrett Peyrefitte 2K
Thu Feb 06, 2020 4:56 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Energy Change
Replies: 4
Views: 34

Energy Change

How does the Gibbs free energy change process relate to the direction of spontaneous reaction?
by Jarrett Peyrefitte 2K
Thu Feb 06, 2020 4:55 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy Changes
Replies: 2
Views: 19

Entropy Changes

How does temperature, volume, state of matter affect the entropy of a substance? Why?
by Jarrett Peyrefitte 2K
Wed Feb 05, 2020 10:34 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Heat Output
Replies: 1
Views: 30

Heat Output

How do you determine the heat output of a reaction given the temperature change of a calorimeter?
by Jarrett Peyrefitte 2K
Wed Feb 05, 2020 10:24 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: ∆U and ∆H
Replies: 6
Views: 77

∆U and ∆H

What is ∆U and ∆H? What are they used for? How are they related?
by Jarrett Peyrefitte 2K
Wed Feb 05, 2020 10:23 am
Forum: Phase Changes & Related Calculations
Topic: Environment
Replies: 4
Views: 81

Environment

What is the environmental impact of burning fossils, and the use of alternative fuels as an energy source?
by Jarrett Peyrefitte 2K
Mon Feb 03, 2020 11:02 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: First Law
Replies: 6
Views: 59

First Law

What is the first law of thermodynamics? How is it used and why?
by Jarrett Peyrefitte 2K
Mon Feb 03, 2020 11:01 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Thermodynamic Systems
Replies: 3
Views: 21

Thermodynamic Systems

What are the three different types of thermodynamic systems?
by Jarrett Peyrefitte 2K
Wed Jan 29, 2020 8:09 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat Capacity
Replies: 3
Views: 16

Heat Capacity

What are the meanings of heat capacity and specific heat capacity?
by Jarrett Peyrefitte 2K
Wed Jan 29, 2020 8:07 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Subtance
Replies: 3
Views: 28

Standard Subtance

What is the standard state of a substance? When is a substance in its standard state?
by Jarrett Peyrefitte 2K
Tue Jan 28, 2020 3:44 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpy
Replies: 2
Views: 37

Enthalpy

How does Hess's Law depend on the fact that enthalpy is a state property?
by Jarrett Peyrefitte 2K
Tue Jan 28, 2020 3:40 pm
Forum: Phase Changes & Related Calculations
Topic: Burns
Replies: 4
Views: 54

Burns

why does steam at 100 degrees C cause a worse burn than boiling water at 100 degrees C?
by Jarrett Peyrefitte 2K
Fri Jan 24, 2020 8:25 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Q and K
Replies: 4
Views: 55

Q and K

What are differences between K and Q? What does it mean when one is larger/smaller than the other?
by Jarrett Peyrefitte 2K
Thu Jan 23, 2020 2:55 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Hydroxide/Hydronium Ions
Replies: 2
Views: 18

Hydroxide/Hydronium Ions

How do you calculate hydroxide ion concentration from a hydronium ion concentration? and vice versa?
by Jarrett Peyrefitte 2K
Wed Jan 22, 2020 10:07 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Acidity Constant
Replies: 4
Views: 42

Acidity Constant

How does the acidity constant of an acid relate to the basicity constant of its conjugate base?
by Jarrett Peyrefitte 2K
Wed Jan 22, 2020 2:45 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Percentage Ionization
Replies: 2
Views: 31

Percentage Ionization

How do we calculate the percentage ionization of a weak acid or base?
by Jarrett Peyrefitte 2K
Wed Jan 22, 2020 2:44 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Conjugate Seesaw
Replies: 3
Views: 35

Conjugate Seesaw

What is the conjugate seesaw? How do we use it in problem solving and calculations?
by Jarrett Peyrefitte 2K
Thu Jan 16, 2020 1:30 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Solids and liquids
Replies: 3
Views: 20

Solids and liquids

Why do we omit solids and liquids when writing for Kc and Kp?
by Jarrett Peyrefitte 2K
Tue Jan 14, 2020 5:55 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Autoprotolysis
Replies: 8
Views: 75

Autoprotolysis

Can someone explain what autoprotolysis is? When does it occur? Why and How?
by Jarrett Peyrefitte 2K
Tue Jan 14, 2020 5:27 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Weak Acids/Bases
Replies: 2
Views: 30

Weak Acids/Bases

Why do solutions of weak acids have higher pH values than solutions of strong acids at the same concentration?
by Jarrett Peyrefitte 2K
Tue Jan 14, 2020 1:56 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Strong Acids/Bases
Replies: 4
Views: 38

Strong Acids/Bases

What are the differences between solutions of strong and weak acids and bases?
by Jarrett Peyrefitte 2K
Mon Jan 13, 2020 10:21 am
Forum: Ideal Gases
Topic: Variables
Replies: 3
Views: 49

Variables

What does each variable/letter represent in the equation PV = nRT?
by Jarrett Peyrefitte 2K
Thu Jan 09, 2020 3:20 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Direction
Replies: 4
Views: 42

Direction

How does the value of the reaction quotient allow the direction of non-equilibrium reaction to be predicted?
by Jarrett Peyrefitte 2K
Wed Jan 08, 2020 2:22 pm
Forum: Ideal Gases
Topic: K and Q
Replies: 13
Views: 111

K and Q

When do you use Q and when do you use K? What are the differences between them?
by Jarrett Peyrefitte 2K
Wed Jan 08, 2020 2:17 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Reaction Direction
Replies: 5
Views: 76

Reaction Direction

How do you determine what direction of the reaction goes given K and the concentrations of all reactants and products?
by Jarrett Peyrefitte 2K
Mon Jan 06, 2020 5:31 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Constant
Replies: 8
Views: 115

Equilibrium Constant

When do you write the equilibrium constant as Kc? and when do you write the equilibrium constant as Kp?
by Jarrett Peyrefitte 2K
Sat Dec 07, 2019 4:17 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Calculating pH
Replies: 1
Views: 48

Calculating pH

Can someone explain step by step on how to calculate the pH of acids and bases?
by Jarrett Peyrefitte 2K
Sat Dec 07, 2019 4:13 pm
Forum: Identifying Acidic & Basic Salts
Topic: Acidic Rain
Replies: 3
Views: 123

Acidic Rain

Why can rain be acidic? How do you reduce acidic rain?
by Jarrett Peyrefitte 2K
Sat Dec 07, 2019 3:51 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Strong Acids
Replies: 3
Views: 55

Strong Acids

What are all the strong acids and strong bases we need to know?
by Jarrett Peyrefitte 2K
Sat Dec 07, 2019 3:38 pm
Forum: Amphoteric Compounds
Topic: Amphoteric vs. Amphoprotic
Replies: 1
Views: 78

Amphoteric vs. Amphoprotic

What is the difference between amphoteric and amphoprotic?
by Jarrett Peyrefitte 2K
Sat Dec 07, 2019 3:36 pm
Forum: Industrial Examples
Topic: Chemotherapy
Replies: 5
Views: 249

Chemotherapy

What are well-known examples of coordination compounds used as chemotherapy drugs?
by Jarrett Peyrefitte 2K
Sat Dec 07, 2019 3:35 pm
Forum: Naming
Topic: Biological Functions
Replies: 2
Views: 65

Biological Functions

What are the biological functions of naturally occurring coordination compounds?
by Jarrett Peyrefitte 2K
Mon Dec 02, 2019 12:05 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Explain VSEPR conceptually
Replies: 12
Views: 240

Re: Explain VSEPR conceptually

VESPR is for naming models that are in 3D, how lone pairs repulse each other, and how the molecule is arranged.
by Jarrett Peyrefitte 2K
Sun Dec 01, 2019 11:59 pm
Forum: Bronsted Acids & Bases
Topic: Definition
Replies: 3
Views: 44

Re: Definition

For the Bronstead-Lowry definition:

Bases accept H+

Acids give away H+
by Jarrett Peyrefitte 2K
Sun Dec 01, 2019 11:56 pm
Forum: Naming
Topic: oxidation
Replies: 8
Views: 95

Re: oxidation

Oxidation is how many electrons is lost from the anion.
by Jarrett Peyrefitte 2K
Sun Dec 01, 2019 11:55 pm
Forum: Naming
Topic: Naming
Replies: 3
Views: 53

Re: Naming

Yes because that is the rule for naming molecules. :)
by Jarrett Peyrefitte 2K
Sun Dec 01, 2019 11:54 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent vs linear
Replies: 56
Views: 1132

Re: Bent vs linear

A linear molecule has a 180 degree angle while a bent has less than a 120 degree angle
by Jarrett Peyrefitte 2K
Sun Nov 24, 2019 8:41 pm
Forum: Hybridization
Topic: Basics
Replies: 2
Views: 37

Re: Basics

Hybridization is when atomic orbitals are mixed into hybrid orbitals so that chemical bonding is easier. Basically, electrons can move into new hybrid orbitals and these orbitals are used to create bonds with other hybrid orbitals in different atoms in order to for a molecule.
by Jarrett Peyrefitte 2K
Sun Nov 24, 2019 7:54 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent vs linear
Replies: 56
Views: 1132

Re: Bent vs linear

Bent molecules have a lone pair, aka "E", compared to linear molecules do not. The lone pairs repel the electrons on the bonded atoms.
by Jarrett Peyrefitte 2K
Sun Nov 24, 2019 7:29 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Intermolecular forces
Replies: 5
Views: 79

Intermolecular forces

What are the different types of Intermolecular forces/forces? How do you identify them?
by Jarrett Peyrefitte 2K
Sun Nov 24, 2019 7:20 pm
Forum: Sigma & Pi Bonds
Topic: Sigma and Pi Bonds
Replies: 7
Views: 98

Sigma and Pi Bonds

How can you tell the difference between a sigma and a pi bond? What are they?
by Jarrett Peyrefitte 2K
Sun Nov 17, 2019 8:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 7
Views: 95

Bond Angles

How and why do lone pairs affect the bond angles in a molecule, cation, or anion?
by Jarrett Peyrefitte 2K
Fri Nov 15, 2019 4:23 pm
Forum: Hybridization
Topic: Hybridization
Replies: 3
Views: 64

Hybridization

What is hybridization? And how does it arise from atomic orbitals?
by Jarrett Peyrefitte 2K
Thu Nov 14, 2019 5:57 pm
Forum: Dipole Moments
Topic: Polarity
Replies: 6
Views: 72

Polarity

How are you able to tell if a molecule is polar or nonpolar?
by Jarrett Peyrefitte 2K
Thu Nov 14, 2019 3:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2.27
Replies: 1
Views: 27

2.27

I am confused particularly with part b and c. What is a radical? How do you go about ranking the increasing HCH bond angles as well? "(a) Draw a Lewis structure for each of the following species: CH3+ ; CH4 ; CH3- 2 ; CH2 ; CH2 2+ ; CH2 2- . (b) Identify each as a radical or not. (c) Rank them ...
by Jarrett Peyrefitte 2K
Thu Nov 14, 2019 3:13 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2F 9
Replies: 1
Views: 33

2F 9

I am confused with this question. What is a hybrid orbital? How do I identify one?
"Identify the hybrid orbitals used by the phosphorus atom in each of the following species: (a) PCl 4 1; (b) PCl 6 2; (c) PCl 5; (d) PCl 3"
by Jarrett Peyrefitte 2K
Sun Nov 10, 2019 11:58 pm
Forum: Ionic & Covalent Bonds
Topic: Bond Strength
Replies: 8
Views: 116

Bond Strength

Which bonds are stronger, covalent or ionic? What is the conceptual reasoning behind it?
by Jarrett Peyrefitte 2K
Sun Nov 10, 2019 7:18 pm
Forum: Resonance Structures
Topic: Orbitals
Replies: 4
Views: 99

Re: Orbitals

A delocalized electron is an electron in an atom, ion or molecule not associated with any single atom or a single covalent bond.
by Jarrett Peyrefitte 2K
Sun Nov 10, 2019 6:42 pm
Forum: Ionic & Covalent Bonds
Topic: Ionization Energy
Replies: 5
Views: 230

Ionization Energy

What is the ionization energy periodic trend? And what is the conceptual reasoning behind it?
by Jarrett Peyrefitte 2K
Sun Nov 10, 2019 2:35 am
Forum: Bond Lengths & Energies
Topic: Bond Lengths
Replies: 3
Views: 51

Bond Lengths

Which bonds are the shortest and which are the longest? What is the reasoning behind it?
by Jarrett Peyrefitte 2K
Fri Nov 08, 2019 3:47 pm
Forum: Electronegativity
Topic: Periodic Trend
Replies: 13
Views: 173

Periodic Trend

What is the periodic trend for electronegativity? Can someone explain why it is the way it is conceptually?
by Jarrett Peyrefitte 2K
Fri Nov 08, 2019 3:42 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge Shortcut
Replies: 3
Views: 53

Formal Charge Shortcut

What's an easy way to find the formal charge without having to write down the equation and plugin the numbers every time?
by Jarrett Peyrefitte 2K
Thu Oct 31, 2019 1:30 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 5
Views: 60

Formal Charge

How would you know when to use the formal charge equation? In what situations would it be used in?
by Jarrett Peyrefitte 2K
Thu Oct 31, 2019 1:21 pm
Forum: Lewis Structures
Topic: octet exceptions
Replies: 5
Views: 45

Re: octet exceptions

Molecules that have exceptions to the octet rule are molecules with an odd number of electrons (ex. NO) , molecules in which an atom or more than one atom have more than 8 electrons (ex. SF6) , and molecules in which an atom or more than one atom have less than 8 electrons (ex. BCl3) .
by Jarrett Peyrefitte 2K
Thu Oct 31, 2019 1:15 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: electron shells
Replies: 1
Views: 28

Re: electron shells

Electrons in an orbital is paired when there are two electron with a spin up and spin down in the same orbital. Electrons are unpaired when there is only one electron with a spin up/down in an orbital, as shown in the photo below.
by Jarrett Peyrefitte 2K
Thu Oct 31, 2019 1:11 pm
Forum: Resonance Structures
Topic: Difference between Resonance and Lewis structures
Replies: 5
Views: 79

Re: Difference between Resonance and Lewis structures

Resonance is when some lewis structures have multiple bonds in different places of the structure. For example, for the lewis structure for (CO3)2- , the double bond can moved to any of the oxygen atoms.
by Jarrett Peyrefitte 2K
Fri Oct 25, 2019 3:47 pm
Forum: Trends in The Periodic Table
Topic: Stable Structures
Replies: 5
Views: 97

Re: Stable Structures

Yes, it is when the formal charge is equal to 0 that shows the structure is stable. To find out the formal charge of a structure, you must use this equation:

FC = V - (L + S/2)
by Jarrett Peyrefitte 2K
Fri Oct 25, 2019 3:33 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 1D. 23
Replies: 1
Views: 39

Re: 1D. 23

Try and use this chart to help you answer these questions!
by Jarrett Peyrefitte 2K
Fri Oct 25, 2019 3:26 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 1D. 11 prob
Replies: 3
Views: 48

Re: 1D. 11 prob

Try and use this chart to help you with future problems like these!
by Jarrett Peyrefitte 2K
Fri Oct 25, 2019 1:11 pm
Forum: Ionic & Covalent Bonds
Topic: Resonance
Replies: 7
Views: 106

Resonance

Can someone explain what resonance is and what the importance of it is?
by Jarrett Peyrefitte 2K
Fri Oct 25, 2019 1:08 pm
Forum: Lewis Structures
Topic: Double Bonds
Replies: 6
Views: 73

Re: Double Bonds

To know when to use a double bond, you must find the formal charge by using the equation, FC = V - (L + S/2). When FC does not equal to 0, then you must use a double bond to make the FC equal to 0.
by Jarrett Peyrefitte 2K
Tue Oct 22, 2019 6:33 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: 1 B27
Replies: 5
Views: 256

1 B27

I am confused on where to start for this problem. What are the steps to find the minimum uncertainty? What do i do with the given numbers?

"A bowling ball of mass 8.00 kg is rolled down a bowling alley lane at 5.00 ± 5.0 m.s?" What is the minimum uncertainty in its position?"
by Jarrett Peyrefitte 2K
Wed Oct 16, 2019 11:49 pm
Forum: Trends in The Periodic Table
Topic: calculating the state
Replies: 3
Views: 45

Re: calculating the state

pz consists of two lobes intersected by the internuclear z axis. A nodal plane exists within the two lobes.

px consists of two lobes intersected by the x axis.

py consists of two lobes intersected by the y axis.
by Jarrett Peyrefitte 2K
Wed Oct 16, 2019 11:47 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: 1B 23
Replies: 2
Views: 40

1B 23

I am confused on where to start for this problem. What are the steps to find the velocity of a neutron of a certain wavelength? What shpuld i do first?

"What is the velocity of a neutron of wavelength 100. pm? "
by Jarrett Peyrefitte 2K
Wed Oct 16, 2019 11:15 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals
Replies: 4
Views: 91

Re: Orbitals

Try using this chart to help you understand how subshells, orbitals, etc. work.

Hope this helps!
by Jarrett Peyrefitte 2K
Tue Oct 15, 2019 5:58 pm
Forum: Quantum Numbers and The H-Atom
Topic: 1D 11
Replies: 4
Views: 71

1D 11

I am struggling with this problem. Can someone explain how to find the orbitals in subshells and what the differences are between l, m, and n?

"How many orbitals are in subshells with l equal to (a) 0; (b) 2; (c) 1; (d) 3? "
by Jarrett Peyrefitte 2K
Sun Oct 13, 2019 4:40 pm
Forum: SI Units, Unit Conversions
Topic: Fundamentals L35
Replies: 5
Views: 136

Re: Fundamentals L35

The T in the question stands for "tons" . 1 ton is equal to 1,000 kg. And one kg is equal to 1,000g. To turn this into grams, you can do

2.5t x 1000kg/1t x 1000g/1kg
by Jarrett Peyrefitte 2K
Thu Oct 10, 2019 3:24 pm
Forum: Empirical & Molecular Formulas
Topic: Converting from grams to percentage
Replies: 11
Views: 293

Re: Converting from grams to percentage

To find the empirical formula, you should always turn the percentage values given to you and imagine the sample mass is 100g (Ex. 54.5% --> 54.5 grams) . Then divide by the molar mass, and divide by the smallest value (molecule must have whole atoms) .
by Jarrett Peyrefitte 2K
Thu Oct 10, 2019 3:08 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical Reactions
Replies: 20
Views: 515

Re: Balancing Chemical Reactions

Try to make a list of reactants and products with their respective number of molecules and balance it one by one.
by Jarrett Peyrefitte 2K
Tue Oct 08, 2019 3:54 pm
Forum: Empirical & Molecular Formulas
Topic: F 17
Replies: 2
Views: 77

F 17

I am confused on letter b for this problem. What must I do with the given molar mass to get the molecular formula? "Osmium forms a molecular compound with mass percentage composition 15.89% C, 21.18% O, and 62.93% Os. (a) What is the empirical formula of this compound? (b) From the mass spectru...
by Jarrett Peyrefitte 2K
Mon Oct 07, 2019 4:48 pm
Forum: Molarity, Solutions, Dilutions
Topic: G 23
Replies: 1
Views: 66

G 23

I am confused on where to even start for this problem. What is the first step I should take to find the concentration of chloride ions in the solution? "In medicine it is sometimes necessary to prepare solutions with a specific concentration of a given ion. A lab technician has made up 100.0 mL...
by Jarrett Peyrefitte 2K
Thu Oct 03, 2019 12:19 am
Forum: Limiting Reactant Calculations
Topic: M 15
Replies: 4
Views: 53

M 15

I'm having trouble with letter c in particular. What steps should I take to solve the percentage yield of aluminum chloride? "Aluminum metal reacts with chlorine gas to produce aluminum chloride. In one preparation, 255 g of aluminum is placed in a container holding 535 g of chlorine gas. After...
by Jarrett Peyrefitte 2K
Wed Oct 02, 2019 10:09 pm
Forum: Significant Figures
Topic: When to apply sig figs?
Replies: 4
Views: 78

Re: When to apply sig figs?

I think Lavelle has said if i'm not mistaken only to round sig figs on your final answer.
by Jarrett Peyrefitte 2K
Wed Oct 02, 2019 9:45 pm
Forum: Limiting Reactant Calculations
Topic: L1 homework
Replies: 2
Views: 31

Re: L1 homework

Yes it is that simple! So you would 0.3/6 like you said and get 0.05 moles of Br2.

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