C2 CM2.3ii relate size and scale of atoms to There are many good websites and resources available on Appreciation of the size of particles is – objects in the physical world nanotechnology, for example , this , this and this . returned to here, extending into more Steven Fry’s Topic 3 Part 2 recent developments of nano-scale CM2.3iii estimate size and scale of atoms Particle size affects properties some interesting primary data here from , – – 4 hours materials. and nanoparticles also summarised . (separate only) CM2.3iv interpret, order and calculate with Calculating surface-area to volume ratio can be helped by using Multilink – numbers written in standard form when Cubes/Snapcubes or similar. Hands on activity with these can help learners dealing with nanoparticles appreciate that chemical reactions can only occur at exposed faces – getting then to count total number of faces as they successively break CM2.3v use ratios when considering – down a 3x3x3 cube can be particularly instructive. relative sizes and surface area to volume comparisons Surface area to volume ratio allows linking forward to rates of reaction, and practicals around dissolving tablets (whole vs crushed), acid and different CM2.3vi calculate surface areas and – sized marble chips, or even . (PAG C8). volumes of cubes C2.3g compare dimensions to – ‘nano’ typical dimensions of atoms and molecules C2.3h describe the surface area to volume – relationship for different-sized particles and describe how this affects properties C2.3i describe how the properties of – nanoparticulate materials are related to their uses C2.3j explain the possible risks associated – with some nanoparticulate materials
C2 Topic 3 Part 2 4 hours (separate only) CM2.3ii – relate size and scale of atoms to objects in the physical world CM2.3iii – estimate size and scale of atoms and nanoparticles CM2.3iv – interpret, order and calculate with numbers written in standard form when dealing with nanoparticles CM2.3v – use ratios when considering relative sizes and surface area to volume comparisons CM2.3vi – calculate surface areas and volumes of cubes C2.3g – compare ‘nano’ dimensions to typical dimensions of atoms and molecules C2.3h – describe the surface area to volume relationship for different-sized particles and describe how this affects properties C2.3i – describe how the properties of nanoparticulate materials are related to their uses C2.3j – explain the possible risks associated with some nanoparticulate materials There are many good websites and resources available on nanotechnology, for example Steven Fry’s , this , this and this . Particle size affects properties – some interesting primary data here from , also summarised . Calculating surface-area to volume ratio can be helped by using Multilink Cubes/Snapcubes or similar. Hands on activity with these can help learners appreciate that chemical reactions can only occur at exposed faces – getting then to count total number of faces as they successively break down a 3x3x3 cube can be particularly instructive. Surface area to volume ratio allows linking forward to rates of reaction, and practicals around dissolving tablets (whole vs crushed), acid and different sized marble chips, or even . (PAG C8). Appreciation of the size of particles is returned to here, extending into more recent developments of nano-scale materials.
304354-topic-c1-and-topic-c2-suggested-teaching-hours-and-outline-scheme-of-work.docx