Investigating Osmosis and Diffusion
This kit stimulates students' curiosity, model an important characteristic of cells, provide a hands-on experience, and develop good laboratory technique. In this activity, students test for the presence of starch and glucose and then use these tests to observe that some molecules can pass through a membrane while others can not. In conclusion, they are asked to propose a reason for why some substances diffuse through the membrane while others do not.
Details at a Glance
- 1-2 Days | 1-2 ~50 minute class periods
- 1 Activity
- Accommodates 1 class, with 12 groups of 2 students
- Consumables service 24 students
- Meets our criteria for supporting literacy
- Includes digital resources
Scientific Concepts
•Models can be used to represent systems and their interactions.
•Cells have particular structures that underlie their functions. Every cell is surrounded by a membrane
that separated it from the outside world.
•All organisms must be able to obtain and use resources, grow, reproduce, and maintain stable
internal conditions while living in a constantly changing external environment.
•All organisms are composed of cells – the fundamental unit of life.
•Cells carry out the many functions needed to sustain life.
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
- 36 Glucose testing strips
- 12 Membranes, semi-permeable
- 12 Cups, plastic
- 3 Droppers
- 3 Lugol’s solution, bottle
- 2 Glucose solution, bottle
- 2 Liquid Starch, bottle
- 1 Teacher’s Guide with MSDS
- 28 Student Worksheets and Guides
- Not included and needed for instruction: Coffee filter.
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