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

Someone, part 1: which compound does c represent? part 2: name a process that could release this compound into the air. part 3: explain how the elements that form it are conserved during the carbon cycle. use complete sentences to explain your answer. justify how this compound was created from a recycling of carbon in the carbon cycle. use complete sentences to explain your answer.

Explain which group an element with the electron configuration 1s2 2s2 2p6 3s2 3p6 3d1 4s2 belongs to.

Can someone me with 1 to 4 plz. fast