JAMB 2018 Chemistry · Question 79
An element used in the production of matches is
Options
- A.nitrogen
- B.aluminium
- C.copper
- D.sulphur
Answer: D. sulphur
Explanation written with AI and checked against the answer key
Analysis
The question asks for an element commonly used in the manufacturing of matches. We need to look at the chemical composition of match heads and the striking surface to identify which of the listed elements is essential.
Concept Explanation
Modern safety matches are designed to ignite only when struck against a specially prepared surface. The chemical process involves:
- Match Head: Typically contains an oxidizing agent (like potassium chlorate, ), a fuel (like sulphur or antimony trisulphide), and binding materials.
- Striking Surface: Contains red phosphorus and powdered glass.
When the match is struck, the friction generates enough heat to convert a small amount of red phosphorus into white phosphorus, which ignites the potassium chlorate, providing the oxygen needed to burn the sulphur and the wooden stick.
Step-by-Step Solution
- Evaluate Nitrogen (A): Nitrogen is an inert gas used in food packaging and the production of ammonia. It is not a component of match heads.
- Evaluate Aluminium (B): Aluminium is a structural metal used in construction and aircraft manufacturing. It is not used in the chemical composition of matches.
- Evaluate Copper (C): Copper is a transition metal used primarily for electrical wiring and plumbing. It plays no role in the combustion process of a match.
- Evaluate Sulphur (D): Sulphur is a non-metal that acts as a fuel in the match head. Its low ignition temperature makes it ideal for catching fire easily once the initial spark is produced.
Conclusion
Based on the chemical composition of matches, sulphur is the element listed that is essential for the ignition process.
Exam Tip: When dealing with questions about industrial chemistry, always remember the "Big Three" for matches: Potassium chlorate (oxidizer), Red Phosphorus (initiator), and Sulphur (fuel). If you see any of these in an exam, you are on the right track!
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