Beginner Topic 1084 of 1102 Biochemistry, Environment & Industry

Matches

Phosphorus compounds and oxidizers ignite by friction.

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In-depth explanation of Matches

Matches ignite by friction, a combustion started by the heat generated when the match head is rubbed. Safety matches separate the reactants, with an oxidising agent such as potassium chlorate in the match head and red phosphorus in the striking strip on the box. Rubbing generates enough heat to ignite a small amount of phosphorus that starts the reaction, which then sets the wood alight. Strike-anywhere matches place phosphorus sulfide, P4S3, in the head so that they can ignite on rough surfaces. Early matches used white phosphorus, which was dangerously toxic.

Going deeper: Matches

Key ideas: Safety matches keep the oxidizer (KClO3) and sulfur or antimony sulfide in the head and red phosphorus in the striking strip on the box; friction converts a trace to white phosphorus which ignites the head. Strike-anywhere matches have P4S3 in the head. White phosphorus matches were banned for causing phossy jaw. Wood is soaked in ammonium phosphate to stop afterglow.

Common mistakes and connections: Mistake: thinking the head alone has all the ingredients in safety matches. Red phosphorus is far less toxic and not spontaneously flammable, unlike white phosphorus. Reaction is highly exothermic redox. Links to allotropes, activation energy and oxidizers.

Visualization of Matches

Collision theory: only collisions with enough energy react. The heat from striking a match supplies it and starts the chlorate-phosphorus reaction. The interactive lesson shows this as a live animation or chart.

Worked example and use case

Potassium chlorate and red phosphorus react strongly when mixed, so safety matches keep them apart until striking.

Frequently asked questions about Matches

What is Matches?

Phosphorus compounds and oxidizers ignite by friction.

Is Matches a beginner, intermediate or advanced topic?

Matches is a beginner topic in Biochemistry, Environment & Industry. It needs no earlier chemistry lessons and is a good starting point.

What should I learn before Matches?

Study these earlier topics in Biochemistry, Environment & Industry first: Fertilizer Production, Explosives, Fireworks Chemistry.

What comes after Matches?

The next topics in Biochemistry, Environment & Industry are Photography Chemistry and Textile Dyes.

Can I practise Matches with quizzes?

Yes. The interactive lesson includes a self-check question on Matches, and the Biochemistry, Environment & Industry quiz draws on every topic in this area.

Where Matches fits in Biochemistry, Environment & Industry

Matches is topic 109 of 127 in Biochemistry, Environment & Industry.