Rust: iron's slow fire The 15 questions of lesson 13 «Rust: iron's slow fire» of the chemistry course of Mova's primary school with their options, 84 sentences, every one parsed by Mova with its syntax tree and pragmatics. How the student did on them: the lesson at school .
t1 Max reckons rust is just orange dirt stuck on the bike, wash it and it's fine. What's true? right ✓ t2 You keep a nail in a sealed jar with a packet of drying crystals, which soak up any water. What will happen? wrong ✗ t3 "dad says if u scratch the car it'll rust there first. why tho?" right ✓ t4 Gran, washing her car after a snowy week: "it's the road salt". Why bother? right ✓ t5 Ollie: "my old bike's all rusty so it must be warm, rusting makes heat". What's true? wrong ✗ t6 Mia says the green on the Statue of Liberty means it's falling apart and should be scrubbed off. What's true? wrong ✗ t7 Leo stepped on a shiny, clean nail in a muddy field. "it's not rusty, so no worries". Right? right ✓ t8 If a cartoon robot made of plain iron went swimming in the sea every day, what would happen? right ✓ t9 Which spoon would you expect to stay shiny for years in a wet kitchen? right ✓ t10 "why'd they cover the fence in zinc, it's gonna corrode anyway innit". What's the point? right ✓ t11 A space game says Mars is red because it is covered in lava. What's the real reason? right ✓ e1 Identify the two substances whose simultaneous presence is required for the rusting of iron. wrong ✗ · exam e2 It is given that a steel article is coated with a layer of zinc. Select the statement most consistent with the established facts concerning such a coating. wrong ✗ · exam e3 Which of the following statements most accurately characterises the cause of tetanus? wrong ✗ · exam e4 Ascertain the principal reason for which rusting, once commenced, proceeds into the depth of the metal. wrong ✗ · exam ← previous
Fire: what it needs and how to put it out
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Tarnish and how metals change
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