S1 10/1 - Ah, ha, ha, ha, stayin' alive

Which of the following should we wear to protect our eyes?

• closed-toe shoes

• gloves

• lab coat

• safety goggles

Answer explanation

Safety goggles are worn to minimise risk of injury to the eyes.

Mr Yuk, to the right, is a trademarked graphic that informs the presence of a poisonous substance. This new symbol is primarily meant for children as a less abrasive way to demonstrate the hazards of poison.

Which of the following hazard symbols is the most similar in meaning to Mr Yuk?

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Answer explanation

The hazard symbol below represents oxidising substances.

Oxidising substances release oxygen easily which can cause fire and/or explosion.

Which of the following hazard symbols represent substances which may cause explosions and fire?

• A

• B

• C

• D

Answer explanation

The risk of causing explosions is associated with explosives.

The risk of fire is associated with flammable substances.

Which of the following describes the difference between a luminous flame and a non-luminous flame?

• A

• B

• C

• D

Answer explanation

Which of the following parts of the Bunsen burner allows us to switch between a luminous flame and a non-luminous flame?

• air hole

• barrel

• base

• gas pipe

Answer explanation

The air hole allows air to enter the burner. When the air hole is closed by adjusting the collar, a luminous flame is produced and when the air is open, a non-luminous flame is produced.