Types of Combustion

Author:Embibe Experts
8th CBSE
IMPORTANT

Important Questions on Types of Combustion

HARD
IMPORTANT

Sanju, a student in the eighth grade, attended a magic performance. The magician removes a piece of white solid from water during a magic trick. Immediately, it starts to burn. He has done this performance under highly protective conditions because the released gas is highly toxic. Sanju was perplexed since he knew that in order to burn something, a matchstick or lighter must be used, but in this instance, the magician used neither of them. Can you assist Sanju in determining the material and what we refer to as such substances that burst without apparent cause?

Question Image

Question Image

HARD
IMPORTANT

Oxygen is required for burning. But do all substances catch fire? To explain this, the chemistry teacher handed some substances to Tanya and asked her to light a matchstick on those substances.

Tanya has been provided with wood, paper, iron nail, straws, kerosene oil, sand, stone piece, charcoal and glass. Some of these substances could easily catch fire and some are resistant to fire.

Question Image Question Image Question Image Question Image Question Image Question Image Question Image Question Image

Could you help Tanya make the categories of the two different types of substances? What are these substances called? Explain.