Identify the following reactions as combination, decomposition, or combustion reactions C7H8 + 9O2 → 7CO2 + 4H2O

2NaHCO3 → Na2CO3 + H2O + CO2

CH4 → C + 2H2O

P4O10 + 6H2O → 4H3PO4

FeSO4 → FeO + SO3

CaCO3(s) → CO2(g) + CaO(s)

1. combustion

2. decomposition

3. decomposition

4. combination

5. decomposition

6. decomposition

Explanation:

combination of a reaction is when 2 more or elements/ compounds combine to form a compound. example: (A+B→AB)

decomposition of a reaction is when a chemical breakdown. example: (AB→A+B)

a combustion reaction is when an element/ compound reacts with oxygen to form the product of water and carbon dioxide.

example: ( + → O + )

the answer would be a

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.