Change in Temperature: Exothermic Reaction

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Learners add calcium chloride to a baking soda solution and observe an increase in temperature along with the production of a gas and a white precipitate. These are all signs of a chemical reaction. Learners can quantify the results of the reaction by using a thermometer to measure the temperature change. Learners also design their own experiment to alter the reaction and measure how it affects the change in temperature. [Activity is publicly available through a web crawler capture on Activity write-up only, images are unavailable.]

Quick Guide

Preparation Time:
5 to 10 minutes

Learning Time:
30 to 45 minutes

Estimated Materials Cost:
$1 - $5 per group of students

Age Range:
Ages 8 - 14

Resource Types:
Activity, Experiment/Lab Activity, Lesson/Lesson Plan


Materials List (per group of students)

  • Baking soda solution
  • Calcium chloride
  • Water
  • Thermometer
  • Graduated cylinder, 50 ml
  • ½, ¼, and 1/8 Teaspoons
  • 2 Small cups
  • Waste container
  • Paper towels
  • Student Activity Sheet
  • Goggles


  • Mathematics
    • Data Analysis and Probability
      • Data Analysis
      • Data Collection
    • Measurement
      • Units of Measurement
  • Physical Sciences
    • Heat and Thermodynamics
      • Heat and Temperature
    • Chemistry
      • Chemical Reactions
      • Solutions
    • States of Matter
      • Gases
    • Structure and Properties of Matter
      • Elementary Particles and Nuclear Physics
  • The Nature of Science
    • The Scientific Process
      • Asking Questions
      • Conducting Investigations
      • Gathering Data
      • Formulating Explanations
      • Communicating Results


To use this activity, learners need to:

  • see
  • read
  • touch

Learning styles supported:

  • Involves hands-on or lab activities


Components that are part of this resource:

This resource is part of:

Access Rights:

  • Free access


  • Kessler, James H. ; Galvan, Patricia M.


  • All rights reserved, American Chemical Society, 2007