Final answer:
It is true that caution should be exercised when using an open or unprotected flame in a chemistry lab. Safety measures include tying back loose clothing, working in a ventilated area, keeping flammables away, and not leaving the flame unattended.
Step-by-step explanation:
Open Flame safety is a crucial aspect of any chemistry lab, where the use of Bunsen burners is common. It is true that caution should be exercised when using an open or unprotected flame.
An open flame can pose various dangers in a lab setting, including the risk of burns and starting unintentional fires. To ensure safety, one must always tie back loose hair and clothing, work in a well-ventilated space, keep flammable materials away, and never leave the flame unattended. It's also important to follow teacher's instructions, know where fire safety equipment is located, use goggles when necessary, handle flammable chemicals with care, and ensure that all Bunsen burners are turned off at the end of practical work.
Understanding the flash points of chemicals is crucial in assessing their flammability. Furthermore, the aforementioned precautions help to prevent accidents like burns from hot beakers or glassware and exposure to hazardous chemicals.