Aclass is using marshmallows to demonstrate different chemicals’ properties by heating and cooling the marshmallows. which student is practicing bad laboratory safety?

neka is cleaning up the melted marshmallows after recording her observations.

nikkos checks his glassware for imperfections before using them.

kenneth is using the bunsen burner to roast the marshmallows and eat them.

kojo threw the used marshmallows into the trash can after his instructor told him to do so.