In which condition did rust form quickest?, Water, Moist air, Water covered with oil, How long did rust take to form in moist air?, 5 days, 8 days, 14 days, In which condition did rust take the longest to form?, Water, Moist air, Water covered with oil, How long did rust take to form in water?, 5 days, 8 days, 14 days, Why does the shortest bar show the quickest rusting?, It shows the least water, It shows the fewest days, It shows the smallest nail, How do you read the number of days from a bar graph?, Count the bars, Read only the condition label, Trace from the top of the bar across to the number scale, What does iron need to rust?, Water and oxygen, Oil and light, Heat and sugar, Why did the oil layer make rusting slower?, It made the iron colder, It limited oxygen reaching the iron, It made the water freeze, A group used a thick iron nail in water and thin iron wool in moist air. Why was this not a fair test?, They used different forms and sizes of iron, They recorded the results, They checked for rust every day, How could the group make its comparison fairer?, Use different iron pieces in every pot, Use identical iron pieces and change only the condition, Change the iron pieces and the conditions, Why is rusting a chemical reaction?, The iron becomes wet, The iron changes position, A new substance forms, Which sentence best explains rusting?, Rusting is a chemical reaction because a new substance called rust forms., Rusting is a chemical reaction because iron melts., Rusting is a chemical reaction because water changes shape.

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