Bunsen Burner Safety

What is the correct way to heat volatile organic liquids that give off flammable vapors?

• Using a Bunsen burner directly.

• In a heating mantle or steam bath within a fume hood.

• Over an open flame in a well-ventilated area.

• By placing them in a beaker on a hot plate.

When lighting a Bunsen burner with a match, what is the correct sequence of actions?

• Turn on the gas, then strike the match.

• Strike the match away from you, then turn on the gas after the match is burning.

• Strike the match directly over the burner, then turn on the gas.

• Turn on the gas and strike the match simultaneously.

What is the ideal appearance of a Bunsen burner flame for heating, and which part is the hottest?

• A yellow flame with a visible outer cone; the outer cone is the hottest.

• A blue flame with a lighter inner cone; the tip of the inner cone is the hottest.

• A large, sputtering flame; the base of the flame is the hottest.

• A small, barely visible flame; the entire flame has uniform temperature.

When heating a test tube directly in a flame, what is the correct procedure?

• Hold it vertically and keep it still.

• Hold it at an angle and move it back and forth.

• Aim it towards yourself to monitor the contents.

• Heat only the bottom of the test tube.

Why should closed containers never be heated?

• The liquid will evaporate too quickly.

• The container may burst due to pressure buildup.

• The contents will not heat evenly.

• It can cause the liquid to boil over.