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Students will conclude at the end of this activity that the combined weight of the reactants in a chemical reaction is always equal to the combined weight of the products.
Activity A :Borax and Glue
For the class:
For each team of 3-5 students:
Activity B:Vinegar and Cream
For each team of 3-5:
Both suggested learning activities in this lesson will help students understand the relationship between the weight of reactants and the weight of the products involved in chemical reactions. Each activity can be completed in about 40 minutes of class time. If sufficient time and materials are available, conduct both activities in class, but if you must choose between the two, your students will be thrilled with the Borax and Glue activity. The Cream and Vinegar activity could be assigned as homework and the results reported to the class.
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.
6-Understand the nature of science.
Activity A: Borax and Glue
Cooperative teams of 3-5 students should complete the following steps:(See Team Procedures)
After the teams have completed the activity lead a discussion about what they learned. The following questions may be helpful:
Activity B: Vinegar and Cream
Cooperative teams of 3-5 students should complete the following steps: (See Team Procedures)
After the students have completed the activity, lead a discussion. The following questions may be helpful.
This activity is preparing and consuming food in the classroom. Utah state law requires that a person with a food handler 's permit be present when food is prepared for student consumption. Sanitary conditions must exist, such as a kitchen or cafeteria.
After students have experimented with making curds in cream by adding vinegar, they will enjoy applying their knowledge in making cheese. Lemon Cheese is simple to make and is a tasty spread for crackers.
To make 6-8 ounces of Lemon Cheese you will need:
Step 1 Acidifying and Coagulation
Heat the milk to 100 degrees F in the canning jar in the saucepan of water. Add the juice for two lemons and stir well. Let the milk set for 15 minutes.
Step 2 Draining
Pour the curds into a cheesecloth-lined colander. Tie the four corners of the cheesecloth into a knot and hang the bag to drain for 1 to 2 hours or until the curds stop draining. The drained liquid is whey. Chilled, with mint leaves added, whey makes a refreshing drink.
Step 3 Mixing, Salting, and Spicing
Take the cheese out of the cheesecloth. You may have to scrape some cheese from the cloth. The cheese can be lightly salted and herbs may be added if desired.
Additional Experiments with Borax and Glue:
After mixing glue and borax allow your students to explore further by predicting the effects of altering the amounts of glue, water and borax, and have them design experiments to test their hypotheses.
Experiment with Laundry Starch and Glue:
First, mix the laundry starch and salt. Then add glue and stir continually. Once a lump of material forms (making it difficult to stir), squeeze remaining liquid from the lump. Compare this “Slime ” to the “Silly Putty.” Experiment with the proportions.
Use this rubric to assess your students ' performances:
Student 's Name ____________________________________
||Descriptions and data clear and accurate. All observations
||Descriptions and data mostly clear and accurate. All observations
||Descriptions and data somewhat clear and accurate. All obervations
|Descriptions and data unclear and inaccurate. All observations incomplete.|
|Used time well and focused attention on the activity.||Used time fairly well. Stayed focused on the activity most
of the time.
||Did the activity but did not appear very interested. Focus
was lost on several occasions.
||Participation was minimal OR student seemed negative about
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.