1.3 Hazard symbols and working safely
5 exam questions worth 8 marks. Write your answer, open the mark scheme, then give yourself the marks you earned. Your answers are saved on this device.
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Give two reasons why hazard symbols are put on containers.
Mark scheme
- to show the dangers of the contents (1)
- to tell people about safe-working precautions (1)
Model answer
They show what dangers the chemical has, and they tell people what precautions to take when using it.
A bottle has a corrosive hazard symbol. What does this mean, and what precaution should be taken?
Mark scheme
- attacks / destroys living tissue / skin / eyes (1)
- wear gloves / eye protection (1)
Model answer
It can destroy skin and eyes, so wear gloves and eye protection.
Which hazard symbol would be on a bottle of ethanol?
Choose one answer.
Correct Not quite: the answer is Flammable
Mark scheme
A: flammable
Model answer
A: flammable.
A student is heating ethanol to dissolve a solid. Suggest one hazard and one precaution.
Mark scheme
- hazard: ethanol is flammable / could catch fire (1)
- precaution: heat in a water bath / no naked flames (1)
Model answer
Ethanol is flammable, so heat it in a hot water bath rather than over a Bunsen flame.
Why should a toxic gas be used in a fume cupboard?
Mark scheme
so the gas is not breathed in / removed safely
Model answer
So the gas is drawn away and not breathed in.
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