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)

Asample of silver (with work function ? = 4.52 ev) is exposed to an ultraviolet light source (? = 200 nm), which results in the ejection of photoelectrons. what changes will be observed if: silver is replaced with copper (? = 5.10 ev) more photoelectrons ejected no photoelectrons are emitted fewer photoelectrons ejected more energetic photoelectrons (on average) less energetic photoelectrons (on average)

After cloud droplets form, what must happen to them for precipitation to occur?

Atrain travels 74 kilometers in 3 hours, and then 81 kilometers in 5 hours. what is its average speed?