AP Chemistry Unit 4 Thermochemistry

AP Chemistry Learning Objectives

  • 5.6 The student is able to use calculations or estimations to relate energy changes associated with heating/cooling a substance to the heat capacity, relate energy changes associated with a phase transition to the enthalpy of fusion/vaporization, relate energy changes associated with a chemical reaction to the enthalpy of the reaction, and relate energy changes to PΔV work. [See SP 2.2, 2.3; Essential knowledge 5.B.3]
  • 5.7 The student is able to design and/or interpret the results of an experiment in which calorimetry is used to determine the change in enthalpy of a chemical process (heating/cooling, phase transition, or chemical reaction) at constant pressure. [See SP 4.2, 5.1; Essential knowledge 5.B.4]
  • 5.8 The student is able to draw qualitative and quantitative connections between the reaction enthalpy and the energies involved in the breaking and formation of chemical bonds. [See SP 2.3, 7.1, 7.2; Essential knowledge 5.C.2]

Prior Knowledge

  • symbols and charges of common monatomic ions (see list) predicted from their position on the periodic table
  • common polyatomic ions (see list)
  • chemical nomenclature - ionic and covalent compounds
  • reaction prediction for reactions involving gases
  • stoichiometry and mole-mole ratios
  • units of measurement for volume, mass, moles, pressure. temperature

Prior Skills

  • writing chemical formulas for ionic and molecular compounds
  • writing and balancing chemical equations to describe reactions
  • finding stoichiometric relationships in chemical reactions
  • rearranging simple algebrain equations to solve for each variable
  • apply the law of conservation of mass to chemical equations
Learning Targets Ch. 6.1 The Nature of Energy and Types of Energy RQ 6.1-6.6

Students will know....

  • The following terms:
    • Energy
    • Radiant energy
    • Thermal energy
    • Chemical energy
    • Potential energy

Students will be able to....

  • Distinguish between potential and kinetic energy, using examples of each.
  • Restate the First Law of Thermodynamics.
Learning Targets Ch. 6.2 Energy Changes in Chemical Reactions RQ 6.7-6.10

Students will know....

  • The following terms:
    • Thermochemistry
    • Open system
    • Closed system
    • Isolated system
    • Endothermic
    • Exothermic

Students will be able to....

  • Classify common processes as endothermic or exothermic.
  • Describe a system as open, closed, or isolated
Learning Targets Ch. 6.3 Introduction to Thermodynamics RQ 6.11-6.14; Problems 6.15-6.20

Students will know....

  • Define and explain the following terms:
    • state of a system
    • state function
  • the sign conventions for work and heat used in the textbook.
  • the relationship and interconversion between work and heat

Students will be able to....

  • Restate the First Law of Thermodynamics, and apply it to chemical equations.
  • Classify properties of materials as state functions or nonstate functions
  • Apply heat and work relationships to gasphase problems.
Learning Targets Ch. 6.4 Enthalpy of Chemical Reactions RQ 6.21-6.24; Problems 6.25-6.28

Students will know....

  • Define and explain the following terms:
    • Enthalpy (ΔH)

Students will be able to....

  • Define H in term of E, P, and V.
  • Use thermochemical equations and stoichiometry to determine amount of heat lost or gained in a chemical reaction.
Learning Targets Ch. 6.5 Calorimetry RQ 6.29-6.30; Problems 6.31-35; 6.38

Students will know....

  • Define and explain the following terms:
    • Calorimetry
    • Heat capacity
    • Specific heat

Students will be able to....

  • Perform calculations involving specific heat, mass and temperature change.
  • Sketch the main components of a constantvolume bomb calorimeter.
  • Determine heats of reactions given experimental data collected in a calorimetry experiment.
Learning Targets Ch. 6.6 Standard Enthalpy of Reaction and Formation RQ 6.39-6.44; Problems 6.45-6.53; 6.57-6.58; 6.61-6.64

Students will know....

  • The meaning of the term enthalpy
  • Hess's Law

Students will be able to....

  • Calculate standard enthalpy of reactions given the standard enthalpy of formations for products and reactants.
  • Apply Hess’s law to a multistep process to determine standard enthalpy of reaction.
Learning Targets Ch. 6.7 Heat of Solution and Dilution RQ 6.65-6.70; Problems 6.71, 6.72, 6.74, 6.75, 6.78, 6.79, 6.89, 6.92 (this one is long...) 6.146; 6.153

Students will know....

  • The meaning of these terms
    • lattice energy
    • heat of solution
    • heat of hydration

Students will be able to....

  • Describe heat of solution, lattice energy, heat of hydration, heat of dilution, system, surrounding, and internal energy.
Daily Learning Activities
Day 21
  • Gas Law Quiz
  • Intro to Thermochem
Day 22
  • Practice problems and applications
  • Prepare Thermochemistry Lab
Day 23
  • Data Collection and analysis-Thermochemistry Lab
Day 24
  • MIDQUARTER EXAM

Links and Resources


L. C. Lee 1990-2016
Creative Commons License
This work by Luann Christensen Lee is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
Based on a work at www.chemistar.com.

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