which reactions performed in the experiment involved chemical changes? crushing calcium carbonate mixing…

which reactions performed in the experiment involved chemical changes? crushing calcium carbonate mixing calcium carbonate and hcl boiling water heating copper (ii) sulfate pentahydrate separating iron filing and sulfur mixing potassium iodide and lead nitrate combining magnesium and hcl burning the candle done

which reactions performed in the experiment involved chemical changes? crushing calcium carbonate mixing calcium carbonate and hcl boiling water heating copper (ii) sulfate pentahydrate separating iron filing and sulfur mixing potassium iodide and lead nitrate combining magnesium and hcl burning the candle done

Answer

Brief Explanations:

Chemical changes result in new substances. Crushing calcium carbonate is a physical change as it only changes the size. Boiling water is a phase - change (physical). Separating iron filing and sulfur is a physical separation. Mixing calcium carbonate and HCl forms new substances like calcium chloride, water and carbon dioxide. Heating copper (II) sulfate pentahydrate loses water of crystallization and forms new substances. Mixing potassium iodide and lead nitrate forms lead iodide precipitate. Combining magnesium and HCl forms hydrogen gas and magnesium chloride. Burning the candle involves combustion and forms new substances like carbon dioxide and water.

Answer:

mixing calcium carbonate and HCl, heating copper (II) sulfate pentahydrate, mixing potassium iodide and lead nitrate, combining magnesium and HCl, burning the candle