Question

when heating liquid materials in laboratory glassware, a student should always 1. wear safety goggles 2. use benedicts solution 3. stopper the test tube 4. record the temperature of the liquid

Explanation:

Safety is crucial in lab work. Heating liquids can cause splashing which may harm eyes. Safety goggles protect eyes from such hazards. Benedict's solution is for sugar - testing, not related to general heating safety. Stopping a test - tube while heating can cause pressure build - up and explosion. Recording temperature isn't a necessary first - step for safety during heating.

Answer:

1. wear safety goggles