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I am currently a first year science teacher for middle school, and I too see a lot of the same issues from students. What I have found with lab experients is that students should be given expectations of how they should behave in a lab and what they are expected to complete prior to beginning the lab. If students are acting out or misbehaving during lab, I have found that providing them with an alternative activity that still provides them with the same information, but maybe is not as 'fun' will encourage them to want to participate in lab appropriately going forward. Also, in the beginning when you are first getting to know students it might be helpful to do labs together step by step while they get used to lab equipment and expectations. Then, gradually when you achieve mutual trust, you can allow students to do their own investigations.
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