which reactions performed in the experiment involved chemical changes?\ncrushing calcium carbonate\nmixing…

which reactions performed in the experiment involved chemical changes?\ncrushing calcium carbonate\nmixing calcium carbonate and hcl\nboiling water\nheating copper (ii) sulfate pentahydrate\nseparating iron filing and sulfur\nmixing potassium iodide and lead nitrate\ncombining magnesium and hcl\nburning the candle\ndone

which reactions performed in the experiment involved chemical changes?\ncrushing calcium carbonate\nmixing calcium carbonate and hcl\nboiling water\nheating copper (ii) sulfate pentahydrate\nseparating iron filing and sulfur\nmixing potassium iodide and lead nitrate\ncombining magnesium and hcl\nburning the candle\ndone

Answer

Brief Explanations:

Chemical changes result in new substances. Mixing calcium carbonate and HCl forms new substances like calcium chloride, water and carbon - dioxide. Heating copper (II) sulfate pentahydrate changes its chemical composition. 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, forming new substances like carbon - dioxide and water. Crushing calcium carbonate, boiling water and separating iron filing and sulfur are physical changes.

Answer:

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