Lesson No: 2 Unit Title: Simple Chemical Reactions
 

Unit No: 7Fb

Lesson Title: Fizzy pop

NC Ref:5-6

Objectives:

MK- test for hydrogen; acids can be corrosive; rust is an e.g. of metal corroding; words rust, corrode, hydrogen

SK — hydrogen forms when acids react with metals; not all metals react with acid; rainwater is acidic; the difference

between reactants and products; acid rain, reactants, products
CK — different metals react at different rates; some facts about hydrogen.

Lesson outline:                                                                                                              

   Starter question —

   What did we see last lesson when a piece of zinc was put in Hydrochloric acid?

   Did it disappear? Gas given off?

   Discuss meaning of corrosion (only iron rusts — it is a particular meaning)

   show rusted nail

   Acids can be corrosive.

  DEMO — how to collect gases, could use worksheet 7fb/1

  PRAC then either use worksheet 7fb2 or pupils react magnesium, zinc and iron

  with sulphuric acid and test the gas with a lit splint.

Clear up

Could get method and results put into books or use the worksheets

If finish then start work sheets 7Fb/4 or 7Fb/5 (for extenstion)

OR use 7Fb/6

Plenary. get equation in book acid + metal --> hydrogen

Alternatively can use the purple box Qs on p68 and the yellow box summary.   Statements as part of plenary session. or order the metals in order of reactivity.

10

15

30

5

Resources:

 rusty nail Bunsen burners, heat proof mats, splints, test tubes, boiling tubes, magnesium, copper, tin,

iron, zinc, aluminium, magnesium,

dilute hydrochloric, sulphuric and nitric acids.

Homework:

Fizzy metals - 7Fb/4 or 7FbI5

All about hydrogen — 7Fb/6

Risk Assessment:

Goggles for all practical work and care with bunsens