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  • Iron and oxygen in a test tube alone will not react (observed by placing a piece of iron in a test tube with a stopper).
  • Iron and water in a test tube alone will not react (observed by completely submerging a piece of iron in water in a test tube with a stopper).
  • Iron, water and oxygen in a test tube will react (observed by placing a piece of iron in a test tube and submerging half of it with water). The following reaction will take place: iron + water + oxygen ----> hydrated iron(III) oxide. Hydrated iron(III) oxide is the chemical name for rust, which will appear as orange flaking on the piece of iron. To speed up this reaction you can use a bit of salt as a catalyst.
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