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How Do You Know When a Chemical Reaction Has Occurred?

Main Core Tie

Science - Chemistry
Standard 4 Objective 1

Time Frame

1 class periods of 15 minutes each

Group Size



Utah LessonPlans


With this simple Inquiry lab students will be introduced to chemical reactions.



  • student page (attached)
  • dH2O, 0.1M Ammonia
  • Universal Indicator

Instructional Procedures

  1. Hook activity: Have the students brain storm what are different types of evidence of chemical reactions.
  2. Have students conduct lab investigation.

Assessment Plan

Scoring Rubric or answer key:
1. The color change is blue to red, then orange, then yellow, then green. The temp. change is ~2 degrees
2. Yes, a gas was produced. The contents foamed
3. Each of the characteristics of the reaction is evidence of a chemical change, therefore, a chemical change is observed.


Lesson Design by Jordan School District Teachers and Staff.

Created: 12/15/2014
Updated: 02/04/2018