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transport systems using surface area to volume ratio. Year 9 Term 2 23/24 B: 3 Moving and changing materials 3.5 enzymes Describe what enzymes are and how they work. Explain the lock-and-key theory. Use the collision theory to explain enzyme action. 4.2.2.1; 4.4.2.3 Worksheet 3.5; Practical sheet 3.5; Technician’s notes 3.5 Quick starter Homework worksheet Homework quiz Slideshow Year 9 Term 2 23/24 B: 3 Moving and changing materials 3.6 Required practical: the effect of pH on the rate of reaction of amylase enzyme Describe how safety is managed, apparatus is used and accurate measurements are made. Explain how representative samples are taken. Make and record accurate observations. Draw and interpret a graph from secondary data using knowledge and observations. 4.2.2.1 Prac 5 Worksheets 3.6.1, 3.6.2 and 3.6.3; Practical sheet 3.6; Technician’s notes 3.6 Quick starter Homework worksheet Homework quiz Slideshow Year 9 Term 2 23/24 C: 2 Structure, bonding and the properties of matter 2.16 Key concept: Sizes of particles and orders of Identify the scale and measurements of length. Explain the conversion of small lengths to metres. Explain the relative sizes of electrons, nuclei and atoms. 4.1.1.5 Practical sheet 2.16.1; Worksheets 2.16.1 and 2.16.2; Technician’s notes 2.16.1 Quick starter Homework worksheet Homework quiz Slideshow Video