What is the chemical formula for tetraphosphorus trisulfide (the flammable compound on match tips that causes ignition)?
Select one: a. P4S4 b. P4S c. P3S4 d. PS3 e. P4S3
The Correct Answer and Explanation is :
The correct answer is e. P4S3.
Explanation:
Tetraphosphorus trisulfide (P4S3) is a chemical compound consisting of four phosphorus atoms and three sulfur atoms. It is commonly used in the production of match tips, as it has the ability to ignite easily when exposed to friction or heat. The substance is highly flammable and plays a crucial role in the ignition process of matches.
Tetraphosphorus trisulfide is a yellow, solid compound with a distinct odor. It is composed of four phosphorus atoms (P) and three sulfur atoms (S), and the chemical formula P4S3 reflects this ratio. The phosphorus atoms are bonded to sulfur atoms, forming a structure where each phosphorus atom is connected to a sulfur atom via covalent bonds. This gives P4S3 its unique properties, including its flammability.
In the context of matches, P4S3 works as an oxidizer. When the match is struck, the friction generates enough heat to break the bonds between the phosphorus and sulfur atoms, leading to the release of energy in the form of heat and light. This process ignites the match, allowing it to burn. The reaction is quite exothermic, meaning it releases a significant amount of heat, which further aids in the ignition of the matchstick itself.
Other options:
- a. P4S4: This is a different compound, known as tetraphosphorus tetrasulfide, which contains four phosphorus and four sulfur atoms. It is not commonly used in matches.
- b. P4S: This does not represent a stable chemical compound and is not the correct formula for any phosphorus-sulfur compound.
- c. P3S4: This is a less common phosphorus-sulfur compound, and it is not used in matches.
- d. PS3: This is not a stable or recognized chemical formula for a phosphorus-sulfur compound.
Therefore, P4S3 is the correct formula for the flammable compound tetraphosphorus trisulfide.