Conservation of Matter Through Engaging Classroom Demonstrations
Explore the concept of conservation of matter with engaging teacher demonstrations involving tea, ice cubes, and Alka-Seltzer. Delve into activities that challenge perceptions about mass changes during physical and chemical processes.
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Presentation Transcript
Conservation of Matter Teacher Demos
Opening ? Challenge Question: Copy and answer the bolded portions below. James, Donte, and Maria are having tea. James places a cup of tea and a sugar cube on a balance, and measures the total mass: James says, When I drop the sugar cube into the tea, the mass indicated on the scale will decrease. Donte replies, No it won t! The mass will stay the same. Maria laughs and says, You are both wrong. The mass will increase. With which person do you agree, and WHY? Provide a thoughtful explanation.
POE: Melting Ice Cubes Question: How would the mass of ice cubes compare to the mass of the liquid water left once the ice cubes melt? Predict: Observe: Bag with ice cubes mass _______ (grams) Bag with melted ice cubes mass ______ (grams) Explain: 1. How does the mass of the ice cubes compare with the mass of the melted cubes? Explain. 2. Why was it necessary to use a sealed baggie in the experiment and not leave the ice cubes in an open cup?
POE: Alka-Seltzer and Water Question: How will the total mass of the Alka-Seltzer and balloon plus the mass of the water and flask compare to the Total mass once the Alka-Seltzer and water are mixed and a reaction occurs? Predict: Observe: Before reaction: Alka-Seltzer and balloon mass _____ (grams) + water and flask mass ______ (grams) = total mass _______ (grams) After Reaction: Total mass after reaction _______ (grams) Explain: 1. How does the mass before the reaction compare to the mass after the reaction? Explain. 2. How would the mass be affected if the same reaction took place in an open container? Why?
Conclusion 1. What does the Law of Conservation of Matter State? 2. HOTS: How do these demonstration prove the Law of Conservation of Matter? 3. Refer back to the opening question. Look at your answer. Using the term Law of Conservation of Matter make any necessary corrections to your explanation.
Properties of Matter Ice Cubes Frozen: Chemical Properties Physical Properties _______________ _______________ Ice Cubes Melted: Chemical Properties Physical Properties _______________ _______________ _______________ _______________ _______________ _______________ Alka-Seltzer: Chemical Properties Physical Properties _______________ _______________ Which one results in a chemical reaction, Melting Ice Cubes or Alka-Seltzer and Water? How do you know? _______________ _______________
