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Students will conduct a variety of experiments to investigate the changes that occur in matter during a chemical reaction.
Each group of 3-5 students need:
Note: The falcon tubes can easily be substituted by plastic cups if needed.
A chemical change or reaction occurs when new kinds of matter are formed. The composition of the matter changes and the new kinds of matter have different properties from the old matter. Evidence of a chemical change may be the result of chemicals reacting with one another. A gas or a solid may be formed where the products are in a different state than the reactants. A change in temperature, pressure, or color may also be evidence of a chemical change. These changes are called indicators. Physical properties, such as the boiling point and the melting point, are often altered as matter undergoes a chemical change (e.g., a raw egg when cooked becomes a hard-boiled egg). All the materials for this activity can be obtained easily at a grocery store and nursery. Jars or cups can easily be substituted for falcon tubes. If both objective indicators (3a &3e) are to be taught, the activity extension for this lesson plan must be completed. The red cabbage juice needs to be prepared within 24 to 36 hours of conducting the activity or it will go stale and may not work properly. Red cabbage juice can be made by placing four or five leaves of red cabbage in about one cup of water and boiling it for a few minutes. Then drain the juice.
1-Use science process and thinking skills.
2-Manifest scientific attitudes and interests.
3-Understand science concepts and principles.
4-Communicate effectively using science language and reasoning.
5-Demonstrate awareness of social and historical aspects of science.
Invitation to Learn: Vinegar and Baking Soda
Present the following scenarios either written or oral and have students identify the indicators that show a chemical reaction or change occurred.
Chemistry Lab Experiments on Planet Warnock
Alien scientists from a planet named Warnock located in another solar system are working in a lab to prepare food items to bring with them on their journey to visit Earth.
Note: This part of the plan could be enhanced by showing graphics of space aliens.
Identify the indicators in the products below that show that a chemical change occurred.
Answer to the Assessment Scenarios
This lesson is part of the Fifth Grade Science Teacher Resource Book (TRB3) http://www.usoe.org/curr/science/core/5th/TRB5/. The TRB3 is designed to be your textbook in teaching science curriculum to your students. This book covers all the objectives of each standard and benchmark. If taught efficiently, a student should do well on the End-of-Level (CRT) tests. The TRB3 is designed for teachers who know very little about science, as well as for teachers who have a broad understanding of science.