Bottles of chemicals in a school laboratory carry hazard symbols. The table describes the hazard symbol on three bottles.
| Bottle | Chemical | Description of the hazard symbol |
|---|---|---|
| P | ethanol | a black flame inside a red diamond |
| Q | concentrated sodium hydroxide solution | liquid dripping onto a hand and onto a surface, damaging both, inside a red diamond |
| R | copper sulfate | a black exclamation mark inside a red diamond |
Give the meaning of the hazard symbol on bottle P.
Give the meaning of the hazard symbol on bottle Q.
Give one precaution a student should take when using ethanol.
Describe what could happen if concentrated sodium hydroxide solution is spilled onto the skin.
Give one item of safety equipment a student should wear when using concentrated sodium hydroxide solution, and give a reason for wearing it.
Suggest why hazard symbols are used on bottles instead of only written warnings.
230 exam-style questions on Edexcel GCSE Chemistry 1.1 Formulae, equations and hazards, covering 1.1.1 Formulae, word and balanced equations, 1.1.2 Balanced ionic equations, and 1.1.3 Hazard symbols and risk in practical work. Each one has a worked solution and a mark scheme showing where the marks go.