Lesson No: 5              Unit Title: Simple Chemical Reactions  
                                   

Unit No: 7Fd

Lesson Title: Fire safety — follows on from lesson 4 so objectives are the same

NC Ref:5-

Objectives:

MK — burning requires oxygen and makes new substances; oxygen

SK— when materials such as metals burn they form oxides; some products of burning; extra care needed if materials are burnt in O~ word equations can represent reactions; fire will only burn when heat, fuel and 02 are present; oxide, word equation, Fire Triangle

CK — some ways of putting out fires; mass changes that take place during chemical reactions

Lesson outline:                                                                                                              Timing:

Registration and starter:

Recap the fire triangle, and show fire extinguisher from the lab.                                             5

How are fires put out? By taking away something in the triangle. Which of 3?

Either cooling (heat taken away) or by stopping 0₂ getting to the fire.

Discuss different types of fire extinguisher - could read from p.72                                       

         — tablefromp.72intobooks.                                                                                           

—   Could do notes based on the purple box questions into books.

Introduce the practical — making a model fire extinguisher — 7Fd/3 or 7Fd/4.                         

PRAC and clear-up. Could finish by using your 'extinguisher' put out a row of lit candles                                                                                                        

Alternative practical — make paper kettles — paper does not set on fire be its kept cool by the water.

   Plenary to discuss the reaction — acid and carbonate used to put out a fire with                     5

   the carbon dioxide gas released by the reaction.

                                                                                                                                           15

   Could look at one of the worksheets which would otherwise be homework if

there is time.

Resources:

Sodium hydrogencarbonate, five different dilutions of sulphuric acid, 25cm3 and 1 OOcm3 measuring cylinders, trough, beehive shelf, delivery tube and bung, conical flask, accurate balance, goggles. do paper kettles] fire extinguisher several candles.

Homework:   Any of

Putting out fires — 7Fd/6

Fireworks — 7Fd/7

Risk Assessment:

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