Mixtures & Solutions
Investigation 4
Part 3
Reaction in a Zip Bag
Using parts of both Investigations 1 and 2, students create a reaction in a closed bag in order to observe the resultant gas more critically.
3. Lesson set up and Management
Physical and Chemical Changes (CH01 1.3.3)
- Know that matter can undergo changes of state such as evaporation, condensation, or freezing and thawing. Grades K, 1, 2, 3, 4, & 5.
- Understand physical and chemical changes at the particle level and know that matter is conserved. Grades 6, 7, & 8.
Planning and Conducting Investigations (IN02 2.1.2)
- Plan and conduct simple investigations, using appropriate tools, measures, and safety rules. Grades K, 1, 2, 3, 4, & 5.
- Plan, conduct, and evaluate scientific investigations, using appropriate equipment, mathematics, and safety procedures. Grades 6, 7, & 8.
Explaining (IN02 2.1.3)
- Use data to construct reasonable explanations. Grades K, 1, 2, 3, 4, & 5.
- Use evidence from scientific investigations to think critically and logically to develop descriptions, explanations, and predictions. Grades 6, 7, & 8.
- Not all chemicals react when mixed.
- Gasses are formed as a product of some chemical reactions.
3. Lesson set up and Management
Materials:
Set up a chemical station and a water station.
Be sure to keep the calcium chloride tightly covered until ready to use.
Use white vinegar.
Use goggles for this lesson.
Use sandwich size clear zip bags.
Student Management:
Explain to the students that this a similar experiment to the one they did in Investigation # 1. Ask students why they think they are using a bag instead of a cup this time? What advantage does the bag provide?
The last section on testing chalk is a good time to talk about using “knowns” to compare properties with “unknowns”.
Writing Support:
The students should add the definition of reactant to their journal.
Reading Support:
In the Mixtures and Solutions: Science Stories book, read “The History of Rubber”.