Item #: AP8832
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In the Thermodynamics—Enthalpy of Reaction & Hess’s Law Classic Lab Kit for AP* Chemistry, students verify Hess’s Law. Students gain valuable experience with the process of calorimetric determinations.
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Classic AP Requirement #13—Determination of Enthalpy Change Associated with a Reaction
Students verify Hess’s Law in this experiment. Three acid–base reactions, chosen so that the third reaction equation equals the first reaction minus the second, are measured for temperature change by calorimetry. The values of heat change and enthalpy of reaction are calculated for each of the three reactions. The reaction results are then compared to verify Hess’s Law.
Complete for 24 students working in pairs.
Thermodynamics—Enthalpy of Reaction and Hess’s Law Inquiry Guidance and AP* Chemistry Curriculum Alignment Transition Guide available! Follow the link in Resources to find this valuable publication that lets you adapt this classic AP Chemistry experiment for guided-inquiry and correlate with the AP Chemistry curriculum framework.
Materials Included in Kit:
Ammonium chloride solution, 2 M, 500 mL, 2
Ammonium hydroxide solution, 2 M, 500 mL, 2
Hydrochloric acid, 2 M, 500 mL, 3
Sodium hydroxide solution, 2 M, 500 mL, 3
Cup, polystyrene 8 oz, 30
Additional Materials Required (for each lab group): Beakers, distilled or deionized water, graduated cylinders, hot plates (3–6 to share), magnetic stirrer and stir bar, digital thermometer, timer or stopwatch.
*Advanced Placement and AP are registered trademarks of the College Board, which was not involved in the production of, and does not endorse, these products.
Correlation to Next Generation Science Standards (NGSS)†
Science & Engineering Practices
Asking questions and defining problems
Developing and using models
Planning and carrying out investigations
Analyzing and interpreting data
Using mathematics and computational thinking
Engaging in argument from evidence
Disciplinary Core Ideas
HS-PS1.A: Structure and Properties of Matter
HS-PS1.B: Chemical Reactions
HS-PS2.B: Types of Interactions
HS-PS3.A: Definitions of Energy
HS-PS3.B: Conservation of Energy and Energy Transfer
HS-PS3.D: Energy in Chemical Processes
Cause and effect
Scale, proportion, and quantity
Systems and system models
Energy and matter
HS-PS1-1. Use the periodic table as a model to predict the relative properties of elements based on the patterns of electrons in the outermost energy level of atoms.
HS-PS1-2. Construct and revise an explanation for the outcome of a simple chemical reaction based on the outermost electron states of atoms, trends in the periodic table, and knowledge of the patterns of chemical properties.
HS-PS1-7. Use mathematical representations to support the claim that atoms, and therefore mass, are conserved during a chemical reaction.
HS-PS3-1. Create a computational model to calculate the change in the energy of one component in a system when the change in energy of the other component(s) and energy flows in and out of the system are known.