This mystery can be used to introduce osmosis and diffusion.
Two beakers are displayed at the front of the room. Both look identical in that they both contain a plastic zip--lock bag with a starch solution inside. The zip-lock bags are both sitting in a clear solution. What the students don’t know is that while the solution in one beaker is just water, the second also contains iodine. In beaker two, the colour of the solution inside the zip-lock bag will change. Students need to figure out why this is happening.
Show health and safety information
Please be aware that resources have been published on the website in the form that they were originally supplied. This means that procedures reflect general practice and standards applicable at the time resources were produced and cannot be assumed to be acceptable today. Website users are fully responsible for ensuring that any activity, including practical work, which they carry out is in accordance with current regulations related to health and safety and that an appropriate risk assessment has been carried out.
You might also like
|Subject(s)||Science, Biology, Practical work, Enquiries and investigations|
|Published||2010 to date|
Share this resource
This resource is part of Teaching enquiry with mysteries incorporated
- Teaching enquiry with mysteries incorporated
- Leaking bag