Science - Teachers Sri Lanka

Criteria for assesment and evaluation
Instructions for group exploration
• Name the zones in the candle flame and explain their nature.
• Appreciates that combustion could be controlled depending on
its requirment.
• Observe the nature of a flame by simple experiment.
• Explane observations scientifically.
• Shows interest in the protection of one’s self, the others and
the environment.
• Your group is entrusted to find the nature of one of the flames.
• Flame of oil lamp.
• Flame of spirit lamp.
• Flame of Kerosene lamp.
• See whether the zones visible in the candle flame and in the
bunsen flame are visible in the flame provided to you.
• Engage in the following activities using the flame provided to
you.
• Holding a piece of ceremic brick to the flame horrizontally
above the flame for about 10 seconds.
• Holding a wire mesh horrizontally across the flame.
• Holding a glass slide horrizontally for about 2 sec. across
the flame.
• Introduce to the thin colourless outr zone of the flame the
end of a thin wire.
• Extinguish the flame and immediately hold the flame of an
ignited splinter close to the wick.
• Find the time required for 20 cm 3 of water in a boiling tube
to boil.
• Compare the nature of the flame provided to you with the
flames of firewood hearth, Kerosene oil cooker and a gas
oven.
• In the instances given above the fundermentel components
elements present in the fuel are Carbon and Hydrogen. The
following set up is provided to you to undestand about the
products of combustion in the flame.