Question

Why is solid naphthalene not heated directly with a bunsen flame?

Answer 1

Answer:

it can produce poisionous gas and it is highly flamable

Answer 2

Answer:

This is to avoid naphthalene's direct heat, which can produce a deadly and combustible vapour gas.

Explanation:

• When heated at 80 °C temperature it rapidly sublimes directly from a solid into a gas, eventually leaving nothing remaining in the crucible. On cool surfaces, the gaseous naphthalene will re-solidify to form needle-like crystals.
• Exposure to a large amount of naphthalene, such as by eating mothballs, may cause nausea, vomiting, diarrhoea, blood in the urine, and a yellow colour to the skin.