No Series: Conservation of Mass
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Discussion and Supporting Materials
Thought starters
- How do the 3 short labs help solidify conservation of mass for students?
- Notice how Mr. Forrest concludes each lab by summarizing results and posing clarifying questions How does the popcorn lab help students distinguish between mass and volume?
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4 MIN
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5 MIN
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5 MIN
UNCUT CLASSROOMS
| TCHERS' VOICE
English Language Arts
12 Comments
Melanie Edens Sep 30, 2018 10:40pm
How do you safely dispose of the lead nitrate mixed with the potassium iodide? Is this really safe for the kids to handle? I am reading I would have to arrange special hazardous waste disposal.
Eric Weis Sep 29, 2018 12:53am
The teacher needs to come up with a way to weigh the gas evolved in the second demo--otherwise the students can't tell if the rule is true or not. We want science students to infer rules from experiments, not to rationalize backwards from a rule given by the teacher. The way he presents his demos, the rule "mass stays the same during a chemical reaction" comes from the first demo. Then, in the second, he says since mass stays the same during a chemical reaction, the missing mass must have gone somewhere else. That's not clear thinking.
Ian Kastelic Jan 26, 2017 2:32pm
Grace Salibay Sep 25, 2016 6:25pm
Stephen Princiotta Mar 31, 2016 12:56pm