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juan carlos asked Which of the following are chemical reactions?
A) Solid copper deposits on a piece of aluminum foil when the foil is placed in a blue copper nitrate solution. The blue color of the solution fades. B) Liquid ethyl alcohol turns into a solid when placed in a low-temperature freezer. C) A white precipitate forms when solutions of barium nitrate and sodium sulfate are mixed. D) A mixture of sugar and water bubbles when yeasts are added. After several days, the sugar is gone and ethyl alcohol is found in the water.
And got the following answer:
A is a chemical reaction as aluminium nitrate forms and as the copper nitrate is reduced to metallic Cu, the solution turns colourless B is not a chemical reaction as there is only change of phase (liquid to solid) C is a chemical reaction as there is double decomposition where white insoluble Barium Sulphate is formed as precipitate. D is also a chemical reaction (biochemical) as invertase in yeast synthesises alcohol from glucose.