AP CHEMISTRY TOPICS/LOs (FALL 2024 FORWARD)
Here you’ll find the full list of 91 official TOPICS, and the 92 associated Learning Objectives (LOs) as defined by the College Board’s AP Chemistry Course and Exam Description (CED) that are applicable to 2025 exam forward. Each TOPIC/LO is further elucidated by the Essential Knowledge (EK) statements in the CED.
UNIT 01 - ATOMS, ELEMENTS & PERIODICITY
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TOPIC 1.1 The Mole LO 1.1.A Calculate quantities of a substance or its relative number of particles using dimensional analysis and the mole concept EK 1.1.A.1-3 |
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TOPIC 1.2 Isotopes and Mass Spectrometry LO 1.2.A Explain the quantitative relationship between the mass spectrum of an element and the masses of the element’s isotopes EK 1.2.A.1-2 |
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TOPIC 1.3 Empirical & Molecular Formula LO 1.3.A Explain the quantitative relationship between the elemental composition by mass and the empirical formula of a pure substance EK 1.3.A.1-3 |
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TOPIC 1.4 Pure & Impure LO 1.4.A Explain the quantitative relationship between the elemental composition by mass and the composition EK 1.4.A.1-2 |
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TOPIC 1.5 Atoms & Electronic Configuration LO 1.5.A Represent the electron configuration of an element or ions of an element using the Aufbau principle EK 1.5.A.1-4 |
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TOPIC 1.6 Photoelectron Spectroscopy LO 1.6.A Explain the relationship between the photoelectron spectrum of an atom or ion and: i. The electron configuration of the species. ii. The interactions between the electrons and the nucleus EK 1.6.A.1 |
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TOPIC 1.7 Periodicity LO 1.7.A Explain the relationship between trends in atomic properties of elements and electronic structure and periodicity EK 1.7.A.1-3 |
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TOPIC 1.8 Formation of Ions LO 1.8.A Explain the relationship between trends in the reactivity of elements EK 1.8.A.1-3 |
UNIT 02 - CHEMICAL BONDING I
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TOPIC 2.1 Sliding Scale of Bond Type LO 2.1.A Explain the relationship between the type of bonding and the properties of the elements participating in the bond EK 2.1.A.1-5 |
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TOPIC 2.2 Bond Length & Strength LO 2.2.A Represent the relationship between potential energy and distance between atoms, based on factors that influence the interaction strength EK 2.2.A.1-3 |
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TOPIC 2.3 The Ionic Lattice LO 2.3.A Represent an ionic solid with a particulate model that is consistent with Coulomb’s Law and the properties of the constituent ions EK 2.3.A.1 |
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TOPIC 2.4 Metallic Bonding & Alloys LO 2.4.A Represent a metallic solid and/or alloy using a model to show essential characteristics of the structure and interactions EK 2.4.A.1-3 |
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TOPIC 2.5 Lewis Structures LO 2.5.A Represent a molecule with a Lewis diagram EK 2.5.A.1 |
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TOPIC 2.6 Resonance & Formal Charge LO 2.6.A Represent a molecule with a Lewis Diagram that accounts for resonance between equivalent structures of that uses formal charge to select between nonequivalent structures EK 2.6.A.1-3 |
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TOPIC 2.7 VSEPR & Hydridization LO 2.7.A Based on the relationship between Lewis diagrams, VSEPR theory, bond orders, and bond polarities: a. Explain structural properties of molecules b. Explain electron properties of molecules EK 2.7.A.1-4 |
UNIT 03 - CHEMICAL BONDING II & GASES
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TOPIC 3.1 IMFs & Ion-dipole Forces LO 3.1.A Explain the relationship between the chemical structures of molecules and the relative strength of their intermolecular forces when: i. The molecules are of the same chemical species. ii. The molecules are of two different chemical species EK 3.1.A.1-5 |
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TOPIC 3.2 Types of Solids & Properties LO 3.2.A Explain the relationship among the macroscopic properties of a substance, the particulate-level structure of the substance, and the interactions between these particles EK 3.2.A.1-7 |
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TOPIC 3.3 States of Matter LO 3.3.A Represent the differences between solid, liquid and gas phases using a particulate-level model EK 3.3.A.1-4 |
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TOPIC 3.4 Ideal Gases LO 3.4.A Explain the relationship between the macroscopic properties of a sample of gas or mixture of gases using the ideal gas law EK 3.4.A.1-3 |
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TOPIC 3.5 Gases & Kinetic Molecular Theory LO 3.5.A Explain the relationship between the motion of particles and the macroscopic properties of gases with: a. The kinetic molecular theory (KMT). b. A particulate model. c. A graphical representation EK 3.5.A.1-4 |
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TOPIC 3.6 Deviations from Ideal Behavior LO 3.6.A Explain the relationship among the non-ideal behaviors of gases, interparticle forces and/or volumes EK 3.6.A.1 |
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TOPIC 3.7 Solutions & Conentration LO 3.7.A Calculate the number of solute particles, volume or molarity of solutions EK 3.7.A.1-2 |
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TOPIC 3.8 Particulate Diagrams of Solutions LO 3.8.A Using particulate models for mixtures: i. Represent interactions between components. ii. Represent concentrations of components EK 3.8.A.1 |
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TOPIC 3.9 Chromatography and Distillation LO 3.9.A Explain the results of a separation experiment based upon intermolecular interactions EK 3.9.A.1 |
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TOPIC 3.10 Solubility of Solutes in Solvents LO 3.10.A Explain the relationship between the solubility of ionic and molecular compounds in aqueous and non-aqueous solvents, and the intermolecular interactions between particles EK 3.10.A.1 |
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TOPIC 3.11 Effect of Radiation on Matter LO 3.11.A Explain the relationship between a region of the electromagnetic spectrum and the types of molecular or electronic transitions associated with that region EK 3.11.A.1 |
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TOPIC 3.12 Photons LO 3.12.A Explain the properties of an absorbed or emitted photon in relationship to an electronic transition in an atom or molecule EK 3.12.A.1-2 |
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TOPIC 3.13 Beer’s Law LO 3.13.A Explain the amount of light absorbed by a solution of molecules or ions in relationship to the concentration, path length, and molar absorptivity EK 3.13.A.1-2 |
UNIT 04 - CHEMICAL REACTIONS
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TOPIC 4.1 Chemical & Physical Change LO 4.1.A Identify evidence of chemical and physical changes in matter EK 4.1.A.1-2 |
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TOPIC 4.2 Equations & Net Ionic Equations LO 4.2.A Represent changes in matter with a balanced chemical or net ionic equation: a. For physical changes. b. For given information about the identity of the reactants and/or product. c. For ions in a given chemical reaction EK 4.2.A.1-3 |
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TOPIC 4.3 Particulate Representations of Equations LO 4.3.A Represent a given chemical reaction of physical process with a consistent particulate model EK 4.3.A.1 |
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TOPIC 4.4 Chemical & Physical Change in Terms of Bonds & Forces LO 4.4 Explain the relationship between the macroscopic characteristics and bond interactions for: a. Chemical processes b. Physical processes EK 4.4.A.1-2 |
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TOPIC 4.5 Stoichiometry LO 4.5.A Explain changes in the amounts of reactants and products based on the balanced reaction equation for a chemical process EK 4.5.A.1-3 |
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TOPIC 4.6 Titrations I LO 4.6.A Identify the equivalence point in a titration based on the amounts of the titrant and analyte, assuming the titration reaction goes to completion EK 4.6.A.1 |
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TOPIC 4.7 Types of Chemical Reaction LO 4.7.A Identify a reaction as acid-base, oxidation-reduction, or precipitation EK 4.7.A.1-5 |
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TOPIC 4.8 Acid-Base Reactions LO 4.8 Identify species as Brønsted-Lowry acids, bases, and/or conjugate acid-base pairs, based on proton-transfer involving those species EK 4.8.A.1-3 |
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TOPIC 4.9 REDOX Reactions LO 4.9.A Represent a balanced REDOX reaction equation using half-reactions EK 4.9.A.1 |
UNIT 05 - CHEMICAL KINETICS
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TOPIC 5.1 Factors Affecting Rates LO 5.1.A Explain the relationship between the rate of a chemical reaction and experimental parameters EK 5.1.A.1-3 |
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TOPIC 5.2 Rate Laws LO 5.2.A Represent experimental data with a consistent rate law expression EK 5.2.A.1-5 |
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TOPIC 5.3 Rates, Graphs & Half-Life LO 5.3.A Identify the rate law expression of a chemical reaction using data that show how the concentrations of reaction species change over time EK 5.3.A.1-6 |
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TOPIC 5.4 Elementary Steps LO 5.4.A Represent an elementary reaction as a rate law expression using stoichiometry EK 5.4.A.1-2 |
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TOPIC 5.5 Collision Theory LO 5.5.A Explain the relationship between the rate of an elementary reaction and the frequency, energy, and orientation of molecular collisions EK 5.5.A.1-3 |
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TOPIC 5.6 Energy Profiles I LO 5.6.A Represent the activation energy and overall energy change in an elementary reaction using a reaction energy profile EK 5.6.A.1-4 |
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TOPIC 5.7 Mechanisms LO 5.7.A Identify the components of a reaction mechanism EK 5.7.A.1-4 |
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TOPIC 5.8 Mechanisms & Rate Law LO 5.8.A Identify the rate law for a reaction from a mechanism in which the first step is rate limiting EK 5.8.A.1 |
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TOPIC 5.9 Intermediates in Rate Determining Steps LO 5.9.A Identify the rate law for a reaction from a mechanism in which the first step is not rate limiting EK 5.9.A.1 |
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TOPIC 5.10 Energy Profiles II LO 5.10.A Represent the activation energy and overall energy change in a multi-step reaction with a reaction energy profile EK 5.10.A.1 |
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TOPIC 5.11 Catalysts LO 5.11.A Explain the relationship between the effect of a catalyst on a reaction and changes in the reaction mechanism EK 5.11.A.1-5 |
UNIT 06 - CHEMICAL THERMODYNAMICS I
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TOPIC 6.1 Endothermic & Exothermic Reactions LO 6.1.A Explain the relationship between experimental observations and energy changes associated with a chemical or physical transformation EK 6.1.A.1-4 |
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TOPIC 6.2 Energy Diagrams LO 6.2.A Represent a chemical or physical transformation with an energy diagram EK 6.2.A.1 |
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TOPIC 6.3 Heat LO 6.3.A Explain the relationship between the transfer of thermal energy and molecular collisions EK 6.3.A.1-3 |
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TOPIC 6.4 Calorimetry LO 6.4.A Calculate the heat q absorbed or released by a system undergoing heating/ cooling based on the amount of the substance, the heat capacity, and the change in temperature EK 6.4.A.1-7 |
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TOPIC 6.5 Heating & Cooling Curves LO 6.5.A Explain changes in the heat q absorbed or released by a system undergoing a phase transition based on the amount of the substance in moles and the molar enthalpy of the phase transition EK 6.5.A.1-2 |
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TOPIC 6.6 Enthalpy LO 6.6.A Calculate the heat q absorbed or released by a system undergoing a chemical reaction in relationship to the amount of the reacting substance in moles and the molar enthalpy of reaction EK 6.6.A.1-3 |
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TOPIC 6.7 Bond Enthalpy LO 6.7.A Calculate the enthalpy change of a reaction based on the average bond energies of bonds broken and formed in the reaction EK 6.7.A.1-2 |
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TOPIC 6.8 Enthalpy of Formation LO 6.8.A Calculate the enthalpy change for a chemical or physical process based on the standard enthalpies of formation EK 6.8.A.1 |
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TOPIC 6.9 Hess’s Law LO 6.9.A Represent a chemical or physical process as a sequence of steps EK 6.9.A.1 LO 6.9.B Explain the relationship between the enthalpy of a chemical or physical process and the sum of the enthalpies of the individual steps EK 6.9.B.1-2 |
UNIT 07 - CHEMICAL EQUILIBRIUM
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TOPIC 7.1 Dynamic Equilibrium I LO 7.1.A Explain the relationship between the occurrence of a reversible chemical or physical process, and the establishment of equilibrium, to experimental observations EK 7.1.A.1-4 |
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TOPIC 7.2 Dynamic Equilibrium II LO 7.2.A Explain the relationship between the direction in which a reversible reaction proceeds and the relative rates of the forward and reverse reactions EK 7.2.A.1 |
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TOPIC 7.3 Q & K LO 7.3.A Represent the reaction quotient Qc or Qp, for a reversible reaction, and the corresponding equilibrium expressions Kc = Qc or Kp = Qp EK 7.3.A.1-2 |
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TOPIC 7.4 Kc & Kp LO 7.4.A Calculate Kc or Kp based on experimental observations of concentrations or pressures at equilibrium EK 7.4.A.1 |
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TOPIC 7.5 Large K & Small K LO 7.5.A Explain the relationship between very large or very small values of K and the relative concentrations of chemical species at equilibrium EK 7.5.A.1 |
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TOPIC 7.6 Mathematical Manipulation of Q & K LO 7.6.A Represent a multi-step process with an overall equilibrium expression, using the constituent K expressions for each individual reaction EK 7.6.A.1-4 |
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TOPIC 7.7 ICE Tables LO 7.7.A Identify the concentrations or partial pressures of chemical species at equilibrium based on the initial conditions and the equilibrium constant EK 7.7.A.1-2 |
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TOPIC 7.8 Particulate Representation of Equilibrium LO 7.8.A Represent a system undergoing a reversible reaction with a particulate model EK 7.8.A.1 |
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TOPIC 7.9 Le Châtelier’s Principle LO 7.9.A Identify the response of a system at equilibrium to an external stress, using Le Châtelier’s principle EK 7.12.A.1-2 |
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TOPIC 7.10 Q versus K and Equilibrium Shifts LO 7.9.A Explain the relationships between Q, K, and the direction in which a reversible reaction will proceed to reach equilibrium EK 7.10.A.1-2 |
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TOPIC 7.11 Ksp LO 7.11.A Calculate the solubility of a salt based on the value of Ksp for the salt EK 7.11.A.1-4 |
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TOPIC 7.12 Common Ion Effect LO 7.12.A Identify the solubility of a salt, and/or the value of Ksp for the salt, based on the concentration of a common ion already present in solution EK 7.12.A.1 |
UNIT 08 - ACIDS & BASES
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TOPIC 8.1 pH, pOH & Kw LO 8.1.A Calculate the values of pH and pOH, based on Kw and the concentration of all species present in a neutral solution of water EK 8.1.A.1-4 |
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TOPIC 8.2 Strong Acids & Bases LO 8.2.A Calculate pH and pOH based on concentrations of all species in a solution of a strong acid or a strong base EK 8.2.A.1-2 |
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TOPIC 8.3 Weak Acids & Bases, Ka & Kb LO 8.3.A Explain the relationship among pH, pOH, and concentrations of all species in a solution of a monoprotic weak acid or weak base EK 8.3.A.1-6 |
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TOPIC 8.4 Neutralization, and Partial Neutralization to create a Buffer LO 8.4.A Explain the relationship among the concentrations of major species in a mixture of weak and strong acids and bases EK 8.4.A.1-4 |
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TOPIC 8.5 Titrations II LO 8.5.A Explain results from the titration of a mono- or polyprotic acid or base solution, in relation to the properties of the solution and its components EK 8.5.A.1-5 |
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TOPIC 8.6 Structure of Acids & Bases LO 8.6.A Explain the relationship between the strength of an acid or base and the structure of the molecule or ion EK 8.6.A.1 |
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TOPIC 8.7 pH of Buffers Relative to pKa LO 8.7.A Explain the relationship between the predominant form of a weak acid or base in solution at a given pH and the pKa of the conjugate acid or the pKb of the conjugate base EK 8.7.A.1-3 |
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TOPIC 8.8 Introduction to Buffers LO 8.8.A Explain the relationship between the ability of a buffer to stabilize pH and the reactions that occur when an acid or a base is added to a buffered solution EK 8.8.A.1 |
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TOPIC 8.9 Henderson-Hasselbalch LO 8.9.A Identify the pH of a buffer solution based on the identity and concentrations of the conjugate acid-base pair used to create the buffer EK 8.9.A.1 |
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TOPIC 8.10 Capacity of Buffers LO 8.10.A Explain the relationship between the buffer capacity of a solution and the relative concentrations of the conjugate acid and conjugate base components of the solution EK 8.10.A.1-2 |
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TOPIC 8.11 pH & Equilibrium Shifts LO 8.11.A Identify the qualitative effect of changes in pH on the solubility of a salt EK 8.11.A.1 |
UNIT 09 - CHEMICAL THERMODYNAMICS II & ELECTROCHEMISTRY
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TOPIC 9.1 Entropy Introduction 9.1 Identify the sign and relative magnitude of the entropy change associated with chemical or physical processes EK 9.1.A.1-2 |
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TOPIC 9.2 Absolute Entropy & ∆S° 9.2 Calculate the entropy change for a chemical or physical process based on the absolute entropies of the species involved in the process EK 9.2.A.1 |
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TOPIC 9.3 Gibb’s Free Energy & Thermodynamic Favorability 9.3 Explain whether a physical or chemical process is thermodynamically favored based on an evaluation of ∆G° EK 9.3.A.1-6 |
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TOPIC 9.4 Kinetic Control 9.4 Explain, in terms of kinetics, why a thermodynamically favored reaction might not occur at a measurable rate EK 9.4.A.1-2 |
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TOPIC 9.5 The Relationship between ∆G° and K 9.5 Explain whether a process is thermodynamically favored using the relationships between K, ΔG°, and T EK 9.5.A.1-4 |
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TOPIC 9.6 ∆G°, ∆H°, ∆S° and Solubility 9.6 Explain the relationship between the solubility of a salt and changes in the enthalpy and entropy that occur in the dissolution process EK 9.6.A.1-2 |
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TOPIC 9.7 Coupling 9.7 Explain the relationship between external sources of energy or coupled reactions and their ability to drive thermodynamically unfavorable processes EK 9.7.A.1-2 |
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TOPIC 9.8 Electrochemistry I 9.8 Explain the relationship between the physical components of an electrochemical cell and the overall operational principles of the cell EK 9.8.A.1-3 |
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TOPIC 9.9 Electrochemistry II 9.9 Explain whether an electrochemical cell is thermodynamically favored, based on its standard cell potential and the constituent half-reactions within the cell EK 9.9.A.1-3 |
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TOPIC 9.10 Electrochemistry III, Non-Standard Conditions 9.10 Explain the relationship between deviations from standard cell conditions and changes in the cell potential EK 9.10.A.1-4 |
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TOPIC 9.11 Quantitative Aspects of Electrolytic Cells 9.11 Calculate the amount of charge flow based on changes in the amounts of reactants and products in an electrochemical cell EK 9.11.A.1 |










