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Heats of Reaction and Hess’s Law—Small-Scale Calorimetry Laboratory Kit

By: The Flinn Staff

Item #: AP6441

Price: $54.75

In Stock.

The Heats of Reaction and Hess’s Law Small-Scale Calorimetry Laboratory Kit is a thermodynamics activity in which students use an indirect method and Hess’s Law to determine the heat of reaction for the combustion of magnesium.

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Product Details

An intense flame, blinding light and searing heat—magnesium burning in air is a dazzling reaction. But how much heat is produced when magnesium burns? In this advanced-level microscale experiment, students use an indirect method and Hess’s Law to determine the heat of reaction for the combustion of magnesium. Students measure the heats of reaction for magnesium and magnesium oxide reacting with hydrochloric acid in special small-scale calorimeters. Using Hess’s Law and a little algebra, students then combine these measurements with the heat of formation of water to determine the heat of reaction for the overall reaction—magnesium burning in air! This is a perfect experiment for students who have completed an introductory calorimetry experiment and want a little challenge. Special small-scale calorimeters included with the kit give remarkably accurate results. Includes reproducible student handouts, detailed background information, complete Teacher Notes with sample data and answers to questions, and the chemicals and small-scale calorimeters needed to perform the lab.

Complete for 30 students working in pairs. Digital thermometers are recommended and available separately.


Materials Included in Kit: 
Hydrochloric acid solution, 1 M, 500 mL, 2
Magnesium metal ribbon, 2 feet, 2
Magnesium oxide, 10 g
Small scale calorimeter, 15

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

Disciplinary Core Ideas

MS-PS1.A: Structure and Properties of Matter
MS-PS1.B: Chemical Reactions
HS-PS1.A: Structure and Properties of Matter
HS-PS1.B: Chemical Reactions

Crosscutting Concepts

Cause and effect
Scale, proportion, and quantity
Systems and system models
Energy and matter

Performance Expectations

MS-PS1-2: Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.
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.