Food tests (RP 4-separate science). This practical was completed in one lesson, students were asked to construct a graph from their data for homework.
How did i deliver this practical?
Groups of 3, each group needs a test tube rack, 3 x test tubes and 1 x boiling tube. Goggles must be worn throughout the practical.
Circus activity-students visited a station to complete a food test (avoids too many students doing the same test or taking all the reagents).
Instead of using a hot water bath for the simple sugars test i lit a bunsen burner and allowed students to heat their solution in a boiling tube, holding it at a slant near the flame using tongs. Students really enjoyed this and the colour change is very sudden. Only one bunsen burner needs to be on for this and can be manned by the teacher to prevent misuse.
AQA spec link: 18.104.22.168
Relevant chapter: B3 Organisation and the digestive system. AQA Biology third edition textbook-Page 46-47
Students are required to know the following;
Required practical 4-qualitative reagents to test for a range of carbohydrates, lipids and proteins. To include: Benedict’s test for sugars; iodine test for starch; and Biuret reagent for protein. AT skills covered by this practical activity: AT 2 and 8. This practical activity also provides opportunities to develop WS and MS. Details of all skills are given in Key opportunities for skills development.