In a mixture of two 4. How does the concentration Recommended activities: Performance task: Design a or more affect the movement of materials? demonstration that illustrates how (For labs and investigations, allow students substances there materials move by simple diffusion to identify independent and dependent is often more of across a semi-permeable variables and controls, what tools are one kind of membrane. (Science Practice 6) needed to do the gathering, how material in one RST 6-8.3 measurements will be recorded, provide place than another. evidence to support explanations or solutions Performance task: Students will and how many data are needed to support a Concentration use demonstrations of osmosis and refers to the claim.) diffusion experiments to observe the amount of a movement of water, sugars and particular Science Activity a Day investigation: starches across artificial and natural substance in a membrane systems. Students will Cell transport p. 82 given amount of develop schematic drawings to another model and explain the movement of Labs: substance, molecules across the cell membrane especially a 20-minute activity on diffusion - as an essential component of cell solution or function. Students will use their mixture. understanding of simple membrane Observing movement across a membrane - functions at the cellular level, Diffusion is the combined with online & literature movement of (With the text, allow students to construct research to write a paper on the molecules from an arguments about ideas and concepts while topic, ”Importance of Diffusion in the area of higher presenting their claims and evidence.) human body”. In their paper student concentration to groups will use arguments, an area of lower Informational text - In this close reading supported by their schematic concentration. assignment, students will read about the drawing models, and evidence from chemical language cells used to their research and experimental communicate and link information to findings to explain how cell-based knowledge gained in the What are organ systems depend on diffusion Cells? close reading assignment in lesson as an important part of their normal one to form an argument.- functioning. (Science Practice 7) RST 6-8.8 Videos: How osmosis works - Assessment questions: Ten multiple choice questions on osmosis and diffusion -
In a mixture of two or more substances there is often more of one kind of material in one place than another. Concentration refers to the amount of a particular substance in a given amount of another substance, especially a solution or mixture. Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. 4. How does the concentration affect the movement of materials? Recommended activities: (For labs and investigations, allow students to identify independent and dependent variables and controls, what tools are needed to do the gathering, how measurements will be recorded, provide evidence to support explanations or solutions and how many data are needed to support a claim.) Science Activity a Day investigation: Cell transport p. 82 Labs: 20-minute activity on diffusion - Observing movement across a membrane - (With the text, allow students to construct arguments about ideas and concepts while presenting their claims and evidence.) Informational text - In this close reading assignment, students will read about the chemical language cells used to communicate and link information to knowledge gained in the What are Cells? close reading assignment in lesson one to form an argument.- Videos: How osmosis works - Assessment questions: Ten multiple choice questions on osmosis and diffusion - Performance task: Design a demonstration that illustrates how materials move by simple diffusion across a semi-permeable membrane. (Science Practice 6) RST 6-8.3 Performance task: Students will use demonstrations of osmosis and diffusion experiments to observe the movement of water, sugars and starches across artificial and natural membrane systems. Students will develop schematic drawings to model and explain the movement of molecules across the cell membrane as an essential component of cell function. Students will use their understanding of simple membrane functions at the cellular level, combined with online & literature research to write a paper on the topic, ”Importance of Diffusion in the human body”. In their paper student groups will use arguments, supported by their schematic drawing models, and evidence from their research and experimental findings to explain how cell-based organ systems depend on diffusion as an important part of their normal functioning. (Science Practice 7) RST 6-8.8
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