Chemistry Combustion & Flame Part 8 (Inflammable substance) Class 8 VIII

TL;DR

Some combustible substances, known as inflammable substances, have very low ignition temperatures and can easily catch fire. The ignition of a matchstick involves the reaction of red phosphorus with oxygen, release of oxygen from potassium chlorate, and the combustion of sulfur.

Transcript

hello friends this video on combustion and flame part 8 is brought to you by exam feel calm no more fear from exam so now that we know about Auto ignition temperature and flash points we see that there are certain combustible substances which can burn even more easily because the ignition temperature is very low so such substances are called inflam... Read More

Key Insights

• 😘 Inflammable substances have low ignition temperatures, making them highly prone to catching fire easily.
• ❓ Examples of inflammable substances include petrol, LPG, alcohol, and diesel.
• 😪 The ignition of a matchstick involves the reaction of red phosphorus with oxygen, release of oxygen from potassium chlorate, and the combustion of sulfur.
• 👨‍🦳 Red phosphorus is used in matchsticks due to its stability and lower volatility compared to white phosphorus.
• 🤕 Potassium chlorate and sulfur are included in the match head to sustain the ignition and combustion process.
• 🥵 Friction is responsible for producing the initial heat required to initiate the ignition process.
• ❓ The release of oxygen from potassium chlorate and the reaction of sulfur with this oxygen contribute to the sustained combustion of the matchstick.

Questions & Answers

Q: What is an inflammable substance?

Inflammable substances are combustible substances with very low ignition temperatures, making them prone to catching fire easily. They include materials like petrol, LPG, alcohol, and diesel.

Q: Why is red phosphorus used in matchsticks instead of white phosphorus?

Red phosphorus is used in matchsticks because it is less volatile and unstable compared to white phosphorus. It does not ignite spontaneously in air and is safer to handle.

Q: How does a matchstick ignite when struck?

When a matchstick is struck, friction produces heat. This heat causes the red phosphorus in the match head to convert into white phosphorus, which then reacts with oxygen in the air, producing a flame.

Q: What purpose do potassium chlorate and sulfur serve in a matchstick?

Potassium chlorate and sulfur are present in the match head to sustain the ignition of the matchstick. Potassium chlorate releases oxygen when heated by the flame, and sulfur reacts with the oxygen to produce sulfur dioxide, contributing to the sustained combustion of the matchstick.

Summary & Key Takeaways

• Inflammable substances are combustible substances with very low ignition temperatures, making them prone to catching fire easily.

• Examples of inflammable substances include petrol, LPG, alcohol, and diesel.

• The ignition of a matchstick involves the reaction of red phosphorus with oxygen, the release of oxygen from potassium chlorate, and the combustion of sulfur.