starch and amylase cm3 freshly made 1% starch rate of reaction slowing which had the faster suspension (mix 5 g soluble down and the amount rate. Students consider starch with a little cold water, of substrate left in the what they would need to pour into 500 cm3 of boiling solution decreasing. know in order to water and stir well, then boil calculate the rate of the until you have a clear Equipment: hydrogen reaction. solution), test tube containing peroxide solution (using 1 cm3 1% amylase solution one of following (or 0.5% pancreatin solution) concentrations: 10, 15, or saliva collected by student, 20, 25, 30 vol) in clean water bath at optimum brown bottle, 2-holed temperature for the enzyme bung with delivery tube (e.g. 37 °C), buffer solution at in one hole connected a set pH (see table above), 5 to rubber tubing, cm3 syringe or pipette, beaker conical flask, large of water for washing pipette, syringe (at least 20 eye protection, 0.01 mol dm-3 cm3), trough containing iodine solution, well tray water, 2 cm3 syringe, (spotting tile). 50 cm3 or 100 cm3 measuring cylinder, Optional: if using saliva – clamp stand and boss, hypochlorite (bleach) solution stopclock or stopwatch, or 1% Virkon solution for eye protection. disinfection of equipment and benches, small beaker or Digital: Substrate other container for collecting concentration saliva. presentation B1h B1.15 Explain how substances are Show students the Students measures the Demonstrate diffusion Transporting transported by diffusion, diffusion of potassium percentage change in mass of and osmosis in the substances osmosis and active transport. manganate(VII) in water strips of potato placed in small intestine using a
starch and amylase which had the faster rate. Students consider what they would need to know in order to calculate the rate of the reaction. cm3 freshly made 1% starch suspension (mix 5 g soluble starch with a little cold water, pour into 500 cm3 of boiling water and stir well, then boil until you have a clear solution), test tube containing 1 cm3 1% amylase solution (or 0.5% pancreatin solution) or saliva collected by student, water bath at optimum temperature for the enzyme (e.g. 37 °C), buffer solution at a set pH (see table above), 5 cm3 syringe or pipette, beaker of water for washing pipette, eye protection, 0.01 mol dm-3 iodine solution, well tray (spotting tile). Optional: if using saliva – hypochlorite (bleach) solution or 1% Virkon solution for disinfection of equipment and benches, small beaker or other container for collecting saliva. rate of reaction slowing down and the amount of substrate left in the solution decreasing. Equipment: hydrogen peroxide solution (using one of following concentrations: 10, 15, 20, 25, 30 vol) in clean brown bottle, 2-holed bung with delivery tube in one hole connected to rubber tubing, conical flask, large syringe (at least 20 cm3), trough containing water, 2 cm3 syringe, 50 cm3 or 100 cm3 measuring cylinder, clamp stand and boss, stopclock or stopwatch, eye protection. Digital: Substrate concentration presentation B1h Transporting substances B1.15 Explain how substances are transported by diffusion, osmosis and active transport. Show students the diffusion of potassium manganate(VII) in water Students measures the percentage change in mass of strips of potato placed in Demonstrate diffusion and osmosis in the small intestine using a
GCSE-Science-Term-1-Detailed-Planning-Document.docx