There are three puzzles in this zip file. There is a puzzle focusing on lab safety (six pieces), measurement (seven pieces), and safety symbols (seven pieces).
I laminate and cut out the puzzle pieces in advance.The idea is to give each student one puzzle piece, and have students work together to complete each puzzle. With a class of 26 students, I use two measurement puzzles, one safety puzzle, and one symbols puzzle.
After I hand out the pieces I let the students interact and try to fit together the puzzles on their own. You can also informally asses students' interpersonal skills during this activity.
After all of the puzzles have been put together, I like to have an activity that the groups complete as a team.