Classify the following reactions as synthesis (S), decomposition (D), single displacement (SD) or double displacement (DD). 1. CH4 + O2 → CO2 + H2O ________ 2. Na + I2 → NaI ________ 3. N2 + O2 → N2O ________ 4. N2 + H2 → NH3 ________ 5. KI + Cl2 → KCl + I2 ________ 6. KClO3 → KCl + O2 ________ 7. S + O2 → SO3 ________ 8. H2O2 → H2O + O2 ________ 9. Na + H2O → NaOH + H2 ________ 10. C2H6 + O2 → CO2 + H2O ________