Are the following chemical equations ⚖️ balanced?

Chemical equation 1 ⚗️
C + O₂ → CO₂ Balanced Not balanced

Chemical equation 2 ⚗️
C + O₂ → CO Balanced Not balanced

Chemical equation 3 ⚗️
CH₄ + O₂ → CO₂ + H₂O Balanced Not balanced

Chemical equation 4 ⚗️
CH₄ + 2O₂ → CO₂ + 2H₂O Balanced Not balanced

Chemical equation 5 ⚗️
2CH₄ + 3O₂ → 2CO + 4H₂O Balanced Not balanced

Chemical equation 6 ⚗️
CH₄ + O₂ → C + 2H₂O Balanced Not balanced

Chemical equation 7 ⚗️
CO + O₂ → 2CO₂ Balanced Not balanced