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CAMBRIDGE PRIMARY SCIENCE 4 UNIT 3: END-OF-UNIT TEST Cambridge Primary Science 4 – Fiona Baxter & Liz Dilley © Cambridge University Press 2021 3 4 Ahmed’s group investigated rusting. This is a graph of their results. a In which conditions did rust form quickest? _________________________________________________________________ b How long did it take for rust to form in air only? _________________________________________________________________ c Why did it take rust longer to form in the water covered with oil? _________________________________________________________________ d This was not a fair test. Say why. _________________________________________________________________ e Rusting is a chemical reaction. Say why this is so. _________________________________________________________________