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“Yesterday is history. Tomorrow is a mystery. Today is a gift. That’s why we call it ‘The Present’.” – Eleanor Roosevelt

Burning


 

What is the name given for burning in science?

Combustion

 

What are the things that can burn quickly?

 

 

What is happening in a lighted candle?

 

The wax on and around the wick melts. Some of the wax boils and gives off a gas which catches fire. This produces heat which melts more wax. This boils and gives off more gas which continues burning. In a lighted candle, it is burning gas which produces the flame.

 

What is the gas required for burning?

Oxygen

 

What are formed in burning?

Chemicals called oxides

 

What are produced in burning?

 

  • Light
  • Heat
  • Flames
  • Gases
  • Smoke

 

What are the main factors needed for burning?

 

  • A burning substance
  • Oxygen
  • The certain temperature of a burning substance

 

What is meant by the ‘certain temperature of a burning substance’?

Burning substances need to be heated to a certain temperature before they will burn. This temperature is the certain temperature of a burning substance.

 

 

Fuels

What are fuels?

A fuel is a material that is used to produce heat and other forms of energy.

E.g. – Wood and Charcoal

 

What happens when wood burns?

 

Things produced in burning are ash smoke and gasses

Things produced when wood burns

 

How is charcoal made?

Wood is burnt in a special oven called kilnThat oven gets less oxygen than usual. Therefore the wood does not burn completely to leave ash. Instead a black substance is made called, ‘charcoal’.

 

What are the uses of charcoal?

 

  • For cooking
  • For heating
  • For making metals from their ores
  • For drawing
  • For making paints
  • For making paper
  • For making inks
  • For making rubber
  • For making gunpowder
  • For making firecrackers