Which tool is used to heat substances on a lab bench?

• A. Hot Plate
• B. Test Tube
• C. Serological Pipette
• D. Swab

Answer: (A)

Heat on a lab bench is provided by a controlled heat source designed to sit on the bench and transfer heat evenly to vessels. A hot plate fits this role exactly, offering adjustable heat and stability for containers like beakers or flasks without an open flame. The other items serve different purposes: a test tube is just a container for holding substances; a serological pipette transfers precise liquid volumes; a swab is used to collect samples. So for heating substances on the bench, the hot plate is the appropriate tool.