BW14
Overview:
Students use antacid tablets and vinegar to model the processes of chemical and
mechanical breakdown of food. After a preliminary investigation of the interaction
between an antacid tablet and vinegar, students design and perform an investigation
to determine the effect of mechanical breakdown on the speed of chemical breakdown.
We are doing activity 14 “Breakdown” in the book. Students will model mechanical
breakdown in an experiment. Students will use antacid tablets and vinegar to model the
process of mechanical and chemical digestion.
1. Read activity 14 “Breakdown” found on pages B-19 to B-21. Read Part A and B.
2. Review the video to understand how the experiment was done in class.
Video BW14: http://www.youtube.com/watch?v=vxnwdYG69_g&safe=active
KEY CONCEPTS AND PROCESS SKILLS
1. Students design and conduct a scientific investigation.
2. Students think critically and logically to relate explanations to evidence.
3, Graphs can reveal patterns that are not immediately apparent from data tables.
4. Living systems, such as the digestive system, demonstrate the complementary
nature of structure and function.
KEY VOCABULARY
chemical breakdown
control
digestive system
function
hypothesis
mechanical breakdown
model
organ
qualitative/quantitative data
variable
Resources:
Digestive system worksheet StudentSheet14.1
Analysis questions 1,2,4,5 on page: B-21
Flip Chart:
Standards:
SCI.7.3.7 2010 DOK 2
Describe how various organs and tissues serve the needs of cells for nutrient and oxygen
delivery and waste removal.
I can describe how organs and tissues help cells function by providing and processing
nutrients, oxygen, and waste.
These activities are part of September/October