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I agree with what has been said here. We aren't always able to change our schedules so the next best thing is to engage the students like, Nayell, said.
I try to keep some fast and easy demos to do at the beginning of each unit. Without explaining the demo I do this right at the beginning of class and everyone is anxious to see what will happen. (Check out some Steve Spangler videos and learn and few of the things he does.) Whatever the demo is done, it will be related to the content we are working on. As they question what happened, why, how, they write it on the board. Students know to write it in their journals (because I have set that expectation and reinforced it since day 1.) Students may not yell out guesses. They use a scratch piece of paper and write down what they think happened, then if they want a prize, they have to research it at home. They bring their answer back the next day and hand me the piece of paper. I read it and nod yes or no. We don't discuss it until science. Then, however many students bring in the correct answer with proof get to pick a prize from my prize pile. I have a basket with inexpensive science related stuff in it. Dollar store solar powered dancers, reptiles that grow in water to 100X their size(yeah right), small keychain flashlights, stuff like that. I also use their responses later in the week when we get to the Elaborate part of the 5E's.
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