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Moist iron wool was inverted over water. The set up was left to stand for 2 days

  1. Explain whether rusting is a physical or chemical reaction
  2. Write an expression using X and Y to show the percentage of Oxygen 
  3. What would be the effect of using a larger piece of iron wool? Explain.

1 Answer

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  1. Chemical change /new substance formed
  2. Oxygen = (Y – X) x 100/Y
  3. No change  since % of oxygen is the same OR Vol. of O2 is fixed 

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