Answer:
Be
Explanation:
Reactivity increases from left to right and decreases from the top of the column to the bottom of column
I. Because they're a limited resource
2 Because they're a cause of carbon pollution.
A polyatomic ion is a group of elements that has a charge that is not 0. for example the charge of P04 is -3
Gasoline contains C and H atoms. During combustion, the carbon (C) from the fuel combines with oxygen (O2) from the air to produce carbon dioxide (CO2).
2 C8H18 + 25 O2 → 16 CO2 + 18 H2O.
Combustion reactions release large amounts of heat. They have negative enthalpy. A negative enthalpy represents an exothermic reaction, releasing heat. This reaction is spontaneous and exothermic, since we can obtain energy from the reaction; the ΔG (free energy) is negative (So 1 is true).
ΔG < 0, so the free energy of the system decreases with the reaction. Remember that when there is a negative ΔG the reaction goes from higher free energy to lower free energy, like in this case.