EDEE275 - Lecture- Week 2

EDEE275 - Lecture- Week 2 - Anila Asghar Teaching...

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Unformatted text preview: Anila Asghar Teaching Elementary Science McGill University January 18, 2012 Childrens Preconceptions/ Alternative Frameworks TODAYS AGENDA Class management Physical and Chemical Change Preconceptions/Alternative Frameworks Problem-solving Conservation of mass Conceptual change Scientific Reasoning Professional Development for Science Teachers QEP Competencies for Science & Technology Chemical Change Examples: Reaction between Vinegar and Baking Soda Rusting of iron Cooking an egg Baking Burning A chemical change produces a new substance as a result of a chemical reaction (energy is either given off or absorbed). Physical Change Examples: Tearing a piece of paper Inflating or deflating a basketball Mixing different solids (e.g., solid sand and iron filings) Mixing solids and liquids (e.g., sugar or salt in water) Changes in the state of matter Melting, freezing, vaporization, condensation, sublimation Cola Problem Fatima balances two cans of cola, one closed and one just opened. After the open can of cola goes flat, what will happen to the pan on the right? Problem 2: Conservation of Mass After Air Leaves Open Cola Childrens reasoning Air seeps into the open cola. The right pan will move down. Air goes out of the open cola. The open cola becomes lighter and the pan will move up. (Asghar 2004, 2011) Fatima balances two cans of cola, one closed and one just opened....
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EDEE275 - Lecture- Week 2 - Anila Asghar Teaching...

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