Characteristics and Behavior of Combustible Substances

The video tutorial explains the difference between combustible and non-combustible substances. Combustible substances, like wood and paper, burn in air when exposed to a flame, producing heat and light. The activity involves using materials such as paper, wood, screws, pebbles, and a candle to demonstrate these properties. Wood and paper catch fire, while pebbles and screws do not, illustrating the concept of combustible and non-combustible substances. The conclusion emphasizes that solid fuels like wood and paper are necessary for burning.

What is the primary characteristic of combustible substances?

• They do not react with air.

• They are always in liquid form.

• They produce heat and light when burned.

• They dissolve in water.

Which of the following materials is needed for the activity described in the video?

• Plastic

• Glass

• Metal rod

• Wood pieces

What happens when a wood piece is placed on the candle flame?

• It remains unchanged.

• It changes color.

• It catches fire to produce heat and light.

• It melts.

Which of the following does NOT catch fire when exposed to a candle flame?

• Pebble

• Paper

• Cardboard

• Wood

What are wood and paper examples of?

• Combustible substances

• Gaseous fuels

• Liquid fuels

• Non-combustible substances

What is required for burning according to the conclusion of the activity?

• Gaseous fuels

• Liquid fuels

• Metallic substances

• Solid fuels like wood or paper