Ca + 02= 6 Fe + HC1 → FeCh + H2 2 S + = SO2 7 CH4 + 02 → ....+..... Al + 02 = 8 K+ H0 → KOH+ H2 4 Br2 + = HBr 9 Fe203 + H2 = 5 c + = CHA 10 CaCh + AgNO3 = Ca(NO3)2 + AgCl

Let's complete the chemical equations you've provided:

1. Ca + O₂ → CaO

   • Calcium reacts with oxygen to form calcium oxide.

2. Fe + 2HCl → FeCl₂ + H₂

   • Iron reacts with hydrochloric acid to produce iron(II) chloride and hydrogen gas.

3. S + O₂ → SO₂

   • Sulfur reacts with oxygen to form sulfur dioxide.

4. CH₄ + 2O₂ → CO₂ + 2H₂O

   • Methane reacts with oxygen to produce carbon dioxide and water.

5. C + O₂ → CO

   • Carbon reacts with oxygen to form carbon monoxide (if complete combustion is implied, CO₂ can also be formed).

6. 2Br₂ + H₂ → 4HBr

   • Bromine reacts with hydrogen to form hydrogen bromide.

7. Fe₂O₃ + 3H₂ → 2Fe + 3H₂O

   • Iron(III) oxide reacts with hydrogen to produce iron and water.

8. CaCl₂ + 2AgNO₃ → Ca(NO₃)₂ + 2AgCl

   • Calcium chloride reacts with silver nitrate to produce calcium nitrate and silver chloride.

Please note that the equations assume standard conditions unless otherwise specified.