Learning objectives
iMany metals react with acids, causing corrosion.
iiAcids react with metals, producing a salt and hydrogen gas.
Scientific enquiry
iiiBe able to test for hydrogen.
ivDiscuss whether there is enough evidence to support conclusions based on experimental outcomes. (Framework YTO Sc1 9e)
Suggested alternative starter activities (5–10 minutes)
Recap last lesson / Share learning objectives / Problem solving / Brainstorming (1) / Brainstorming (2)
True/false game. /
  • Describe how metals react with acids.
  • Test for hydrogen.
  • Decide if you have enough evidence to make conclusions from experiments. (Sc1)
/ Pupils consider why metals take different amounts of time to corrode.
Catalyst Interactive Presentations 3 / Pupils predict observations when magnesium is added to acid. / Pupils suggest why metal reactions are a nuisance.
Suggested alternative main activities
Activity / Learning objectivessee above / Description / Approx.
timing / Target group
C / H / E / S
Textbook E3 / i, ii and iii / Teacher-led explanation and questioning ORPupils work individually, in pairs or in small groups through the in-text questions and then onto the end-of-spread questions if time allows. / 20 min / R/G / G / R / S
Activity E3a Practical / ii, iii and iv / Metals and acids reactionsPupils carry out and compare the reactions of magnesium, zinc and copper with three different acids. They discuss what conclusions can be made based on the evidence they gather. / 25 min /  / 
Activity E3b Practical / ii, iii and iv / Investigate: Tin cansPupils investigate the reaction of food acids with iron and tin. They select a range of fruits and vegetables and investigate whether they react with iron and tin to decide whether they are suitable for canning. / 15 min
(to set up – look at it next lesson) /  / 
Suggested alternative plenary activities (5–10 minutes)
Review learning / Sharing responses / Group feedback / Word game / Looking ahead
Quick quiz. / Whole-class discussion of similarities and differences in the reactions from Activity E3a. / Pupils work as groups to discuss Activity E3a Question 3. / Write a question game. / Pupils predict the outcomes of Activity E3b.
Learning outcomes
Most pupils will … / Some pupils, making less progress will … / Some pupils, making more progress will …
  • describe how metals react with acids
  • describe the test for hydrogen.
/
  • identify that hydrogen is produced when many metals react with acids
  • describe the test for hydrogen
  • know whether there is enough evidence to make a conclusion.
/
  • describe how a range of metals react with acids and the implications of this for the food canning industry
  • be able to balance chemical equations
  • suggest what further work needs to be carried out to provide firm evidence for conclusions.

Key words / Out-of-lesson learning
red only: balanced equation / Homework E3
Textbook E3 end-of-spread questions
Look for examples of metal corrosion in the locality

© Harcourt Education Ltd 2004 Catalyst 3

This worksheet may have been altered from the original on the CD-ROM.