What type of reaction are these?

1) 2 MgI₂ + Mn(SO₃)₂ → 2 MgSO₃ +MnI₄

2) P₄ + 3 O₂ → 2 P₂O₃

3) SeCl₆ + O₂ → SeO₂ + 3 Cl₂

4) C₃H₆O + 4 O₂ → 3 CO₂ + 3 H₂O

r just means there's a number of carbon in teh chain. for example rcooh means that after x number of carbon, the chain ends with cooh.

explanation:

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.