Make an equation: ca- cao- ca (oh) 2- cacl Zn- zncl2- zn (oh) 2- zno

1 chain:

1) 2Ca + O2 = 2CaO (when calcium interacts with oxygen, calcium oxide is formed);

2) CaO + H2O = Ca (OH) 2 (when calcium oxide interacts with water, calcium hydroxide is formed);

3) Ca (OH) 2 + 2HCl = CaCl2 + 2H2O (when calcium hydroxide interacts with hydrochloric acid, calcium chloride and water are formed).

2 chain:

1) Zn + Cl2 = ZnCl2 (when zinc interacts with chlorine, zinc chloride is formed);

2) ZnCl2 + 2KOH = Zn (OH) 2 + 2KCl (when zinc chloride interacts with potassium hydroxide, zinc hydroxide and potassium chloride are formed);

3) Zn (OH) 2 = ZnO + H2O (when heated, zinc hydroxide decomposes into zinc oxide and water).