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Transcript
Split It Up!: Separation of a Mixture (Teacher) Objectives: To understand and recognize physical properties of matter To explore mixtures and separation techniques Text References: Holt Science Spectrum: A Physical Approach by Dobson, Holman, and Roberts pp. 41-42; 53-60 Chemistry: The Central Science by Brown, Lemay, and Bursten. pp. 7-9;11-12 Background: A physical change is a change in a materials size, shape, or state of matter, but it is still the same material. It changes its physical appearance but not its composition. A mixture is a combination of different pure substances that still retains its own chemical identity and its own properties Since the components of a mixture retains its identity of the material, a mixture can be separated by taking advantage of the differences in their properties Materials: Iron fillings Poppy seeds Salt Sand or Rocks Fork Magnet Spoon Strainer Water Student Activity: Divide class into 4 groups. Set-up 4 stations around the classroom/laboratory with all the aforementioned materials. Ask students to brainstorm in their Journals: o What are some of the physical properties of the components of the mixture? o How can the differences in physical properties be used to separate the mixture into its three components using the other materials at their station? Draw an accompanying flow diagram (on transparency and in journal). Fork Magnet Spoon Strainer Water Each group should share their method of separation Discuss Essential Concepts: o Mixing is a physical change o Boiling Point, Density, Magnetism, & solubility are physical properties Discuss Career Application: Chemical Engineering Discuss other methods of separation: Filtration, Distillation, and Chromotography Sample Flow Diagram: Mixture Rocks Salt Magnet (Magnetism) Iron Fillings Rocks, Salt, & Poppy Strainer (Size) Rocks Salt & poppy seeds Water Salt, Poppy Seeds, & Water Spoon Poppy Seeds Salt & Water Evaporation (Boiling Point) Salt Water Split It Up!: Separation of a Mixture (Student) Objectives: To understand and recognize physical properties of matter To explore mixtures and separation techniques Background: A physical change is a change in a materials size, shape, or state of matter, but it is still the same material. It changes its physical appearance but not its composition. A mixture is a combination of different pure substances that still retains its own chemical identity and its own properties Since the components of a mixture retains its identity of the material, a mixture can be separated by taking advantage of the differences in their properties Activity: Mix the iron fillings, salt, and sand together in the beaker Brainstorm in your journals the following: (With your group) 1. What are some of the physical properties of the components of the mixture? 2. How can the differences in physical properties be used to separate the mixture into its three components using the other materials at your station? Draw an accompanying flow diagram (on transparency and in journal) Prepare to share you separation scheme with the class Text References: Holt Science Spectrum: A Physical Approach by Dobson, Holman, and Roberts pp. 41-42; 53-60 Chemistry: The Central Science by Brown, Lemay, and Bursten. pp. 79;11-12