Lesson No: 6 Unit Title: Simple Chemical Reactions
 

Unit No: 7Fe

Lesson Title: Burning issues

NC Ref:5-6

Objectives:

MK — a fuel is something that releases energy when it burns; name several fuels; 0₂ from air used up during burning; fuel

SK— fossil fuels (FF) contain carbon; burning FF produces C0₂ natural gas is called methane and when burnt forms water and carbon dioxide; methane

CK — carbon monoxide formed when fuel burns without enough 0₂; a hydrocarbon is a chemical which contains C and H; some of the old theories of combustion; carbon monoxide, hydrocarbon, phlogiston

Lesson outline:

Looking at what is produced when fuels burn (pages 74 and 75)  
Pupils list five fuels in their books. Names of different types of fuels.
Focus on fossil fuels.
What is formed when fossil fuels burn? Clue — FF contain hydrogen (may get answer hydrogen oxide)
Could show them a candle burning in air and get a prediction of what will happen when a beaker put over the candle. (should get some blackening of the glass from the carbon, water condensing and the candle going out as oxygen used up).

PRAC 7Fe/ 1,  — products of combustion [may want to do this as a demo with the help of the pupils]

OR

Could do practical 7Fe3 – burning candles in different beakers and timing how long they stay alight for then plotting results on a graph

Plenary

Reactions summary – 7Fe/4

5

10

30

15

Resources:   - Goggles, fuels (wax, wood, natural gas, ethanol), bunsen burners if necessary, suction pump. U-rube, delivery tubes and bungs, boiling tubes, limewater, thermometers, conical flasks, troughs

Homework

Wordsearch – 7Fe/5

Word equations for burning – 7Fe/6

Risk Assessment:

Eye protection to be worn by all during demo and the practical