Chem100 Safety Quiz: Working With Hot Glassware And Equipment 11

CHEM 100 LEC/LAB

Why Must Heated metals, Glassware, and Ceramics Be Handled Carefully?

They stay hot for a long time, and you cannot tell by appearance; test for heat by cautiously bringing the back of your hand near to feel radiating heat

How Should Hot Objects like Beakers, Evaporating Dishes, and Crucibles Be Handled?

With the proper tongs: beaker tongs, evaporating dish tongs, and crucible tongs

What Should Be Kept at a Safe Distance from the Gas Burner?

Hair, clothing, and hands

How Should Hot Evaporating Dishes and Crucibles Be Cooled?

Place them on wire gauze; do not place them on the lab bench or lab manual

Why Should Closed Containers Never Be Heated?

Pressure buildup may cause the container to explode

What Happens if Hot Glassware comes into Contact with Cold Water?

It will shatter

How Should a Test Tube Be Positioned when Heating Liquid?

Held with a test tube holder, pointing along the length of the lab bench with the open end away from yourself and others

What is the Proper Technique for Heating a Test Tube?

Move it back and forth through the flame at an angle and do not heat above the liquid level