Chris is about to do an experiment to measure the density of water at several temperatures. His teacher has him prepare and sign a safety contract before beginning the experiment. Which item is most likely part of the safety contract?

A lab safety contract commonly requires students to check equipment for damage before using it, because cracked or chipped glassware can break and cause injury. Therefore, the most likely item is to inspect the glassware before beginning the lab. The other choices are less appropriate: water is not generally a special lab hazard, and students do not need to bring an electronic MSDS or avoid discussing the experiment.

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