Changing of Equilibrium (Le Chatelier’s Principle)
According to Le Chatelier's Principle, if stress is applied to any system of reactions at equilibrium, the equilibrium will adjust or shift itself in such a direction so as to reduce the effect (or relieve the stress) of any change in conditions. In this series of activities, students put Le Chatelier's Principle to the test. They learn the four important factors that can disturb the equilibrium of a chemical reaction: concentration, pressure, temperature and light. Your students will discover that chemical reactions do not always go to completion and that all are somewhat reversible. Students encourage one of two simultaneous chemical reactions which cause the equilibrium of the mixture to change. This Lab-Aid is complete for 50 students.
Details at a Glance
- 1 Day | 1 ~50 minute class period
- 1 Activity
- Accommodates 3 classes, each with 12 groups of 2 students
- Consumables service 72 students
- Meets our criteria for supporting literacy
Scientific Concepts
• Test Le Chatelier’s Principle
• Discover that many chemical reactions do not go to completion
• Investigate a system at equilibrium and study the effect of changes
Guides & Student Sheets
Our kits and modules provide you with everything you need so you can open, review, and teach the material confidently the next day.
- Full downloadable Teacher Guide with background information, detailed instruction, example data and answers
- Downloadable Student Sheets with age appropriate background information, full procedure(s), and analysis questions
- All materials necessary to carry out the investigation
- Safety Data Sheets
Kit Components
- 1 Teachers Guide with MSDS
- 50 Student Worksheets and Guides
- 12 Chemplates® w/spatula
- 2 Drop control bottles of Barium Nitrate
- 2 Drop control bottles of Sodium hydroxide, dilute
- 2 Drop control bottles of Hydrochloric acid, dilute
- 2 Drop control bottles of Potassium chromate and dichromate