Write the name of the type of chemical reaction for 4fe(s) + 3o_2(g)> fe_2o_3(s)

                  Iron and oxygen react to form iron(III) oxide: 

                              4 Fe(s)  +  3 O₂ (g)  →  2 Fe₂O₃ (s)

           This type of chemical reaction is a "synthesis" reaction
                   (forms a "metal oxide" product).

1. and 2. question: in which equation? or i don't understand you, 3. a), 4. c), 5. c), 6. b), 7. d), 8. d) if small number is underlined(behind symbol) , b) if big number is underlined(in front of symbol)9. what is underlined there? 10. c)