1.Most Metals react with Oxygen to form Metal Oxide For Example-: 2Mg + O2 → 2MgO 2Ca + O2 → 2CaO 4Na + O2 → 2Na2O 4K + O2 → 2K2O 2. Characteristics of Chemical Reactions When a chemical reaction takes place, many types of things happen. such as- Evolution of a gas Formation of a precipitate Change in colours Change in temperature Change in state Reactions for Evolution of Gases Most metals react with acid to form metal salt with evolving hydrogen gas. such as- 2Na + H2SO4 → Na2SO4 + H2 2K + H2SO4 → K2SO4 + H2 Zn + H2SO4 → ZnSO4 + H2 Mg + H2SO4 → MgSO4 + H2 Most of the metal carbonates or metal bi-carbonates react with acid to evolve carbon di oxide gas. Na2CO3 + 2HCl → 2NaCl + CO2 + H2O K2CO3 + H2SO4 → K2SO4 + CO2 + H2O CaCO3 + HCl → CaCl2 + CO2 + H2O Reactions for the formation of Precipitate(insoluble part) A precipitate is a “solid product” which separates out from the solution during a chemical reaction. Potassium iodide reacts with lead(II) nitrate and produces lead(II) iodide and potassium nitrate. Potassium nitrate is water-soluble. However, lead(II) iodide is only partially soluble in water. … The lead ions and iodide ions will eventually meet […]
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