Equipment Salt, balances, spatulas, stirring rods Slide 2, 3 printed

PM Explain what happens to sugar when you put it in a cup of tea. Try to describe and explain dissolving using particle theory (extended writing) Drawn particles diagrams of solids and liquids to represent the sugar, tea/water, tea with sugar (mixture) Described properties of solids and liquids Solids arranged in rows/have a fixed shape. Particles in a solid vibrate and are held together closely Liquids mold to take the shape of the container/particles flow Liquid particles are relatively close together Liquid particles have more energy and movement than solids Described and explained what the particles do during dissolving 7. When sugar dissolves in liquid water/tea, particles of the solid sugar mix with particles of the liquid water/tea 8. To form a solution 9. During dissolving the solute (sugar) is mixed with a solvent (tea/water) to form a solution 10. Solution (tea with sugar) is a mixture that can be separated You now need to re-draft your work below based on the feedback and targets circled : PM

Term Meaning Example Solvent The mixture formed when a solute has dissolved in a solvent The salt in sea water Solute A substance that will not dissolve Sand in water Solution The liquid in which a solute dissolves Sea water Soluble The substance that dissolved in a liquid to form a solution The water in sea water Insoluble A substance that will dissolve Salt in water Term Meaning Example Solvent The mixture formed when a solute has dissolved in a solvent The salt in sea water Solute A substance that will not dissolve Sand in water Solution The liquid in which a solute dissolves Sea water Soluble The substance that dissolved in a liquid to form a solution The water in sea water Insoluble A substance that will dissolve Salt in water

Retrieval practice 1) What are the missing gaps 1, 2, 3, 4 2) List some of the properties of gases 3) Describe the change of state ‘evaporation’ in terms of closeness, arrangement and motion of particles 4) What does the term sublimation mean? 1 2 3 4

TWWL: about solutions and dissolving SO THAT I CAN… Describe solutions using key terms Describe a solution as mixture that can be separated Explain dissolving using the particle model 10/11/2018 Keywords and examples? Term Meaning Example Solvent The mixture formed when a solute has dissolved in a solvent The salt in sea water Solute A substance that will not dissolve Sand in water Solution The liquid in which a solute dissolves Sea water Soluble The substance that dissolved in a liquid to form a solution The water in sea water Insoluble A substance that will dissolve Salt in water

Keywords SM Solvent The liquid in which a solute dissolves Term Meaning Example Solvent The liquid in which a solute dissolves The water in sea water Solute The substance that dissolved in a liquid to form a solution The salt in sea water Solution The mixture formed when a solute has dissolved in a solvent Sea water Soluble A substance that will dissolve Salt in water Insoluble A substance that will not dissolve Sand in water

Dissolving How much salt can you dissolve in 10cm3 of water? Higher ability students only

Dissolving Working in pairs: Measure 10 cm3 of water (solvent) into a beaker Record the mass of beaker + 10 cm3 of water = Collect a beaker of the solute (salt) Record the mass of beaker of solute before = Add a spatula at a time of solute (salt) to your beaker of solvent and stir Keep adding until no more will dissolve (saturated solution) Mass of beaker + solution = Mass of beaker of solute after = Mass of solute used (before – after) = 36g/100cm3.

Dissolving Working in pairs: Measure 10 cm3 of water (solvent) into a beaker Record the mass of beaker + 10 cm3 of water = Collect a beaker of the solute (salt) Record the mass of beaker of solute before = Add a spatula at a time of solute (salt) to your beaker of solvent and stir Keep adding until no more will dissolve (saturated solution) Mass of beaker + solution = Mass of beaker of solute after = Mass of solute used (before – after) = 36g/100cm3.

Dissolving What is happening to the particles during dissolving? This is a mixture of salt and water… do you think you can separate again? Higher ability students only

Dissolving 6 marks Task: Explain what happens to sugar when you put it in a cup of tea. Try to describe and explain dissolving using particle theory. Key words: dissolve, mixture, solute, solution, solvent, sugar, tea, solid, liquid, particles Top tips: Draw particle diagrams to show solids, liquids and dissolving (to represent sugar, water, then mixture forming). Included properties of solids and liquids Described what particle do during dissolving and what forms. Described what a solution is.

Tick the points (1-10) they made correctly and circle targets for improvement Explain what happens to sugar when you put it in a cup of tea. Try to describe and explain dissolving using particle theory (extended writing) Drawn particles diagrams of solids and liquids to represent the sugar, tea/water, tea with sugar (mixture) Described properties of solids and liquids Solids arranged in rows/have a fixed shape. Particles in a solid vibrate and are held together closely Liquids mold to take the shape of the container/particles flow Liquid particles are relatively close together Liquid particles have more energy and movement than solids Described and explained what the particles do during dissolving 7. When sugar dissolves in liquid water/tea, particles of the solid sugar mix with particles of the liquid water/tea 8. To form a solution 9. During dissolving the solute (sugar) is mixed with a solvent (tea/water) to form a solution 10. Solution (tea with sugar) is a mixture that can be separated You now need to re-draft your work below based on the feedback and targets circled : PM

Extension Why is the mass of the solution the sum of the mass of the water plus the mass of the salt, but the volume of the solution does not go up to 100 cm3. Higher ability students only

Reflection How do you feel about today’s objectives? Choose a face and write why you feel this way (I think I can now _______ because ______________) Describe solutions using key terms   Describe a solution as mixture that can be separated Explain dissolving using the particle model