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1) A piece of sodium metal is added to distilled water.

2) Solid ammonium carbonate is heated in a test tube.

3) A piece of iron is immersed in a solution of iron(III) sulfate.

4) Carbon dioxide gas is bubble through water containing a suspension of calcium carbonate.

5) Hydrogen gas is passed over hot iron(II) oxide powder.

6) Solutions of ethanol and formic acid are mixed and warmed.

7) A piece of solid bismuth is heated strongly in oxygen gas.

8) Excess concentrated sulfuric acid is added to solid calcium phosphate.

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