Answer:
"A chemical reaction requires 3.00 g of oxygen" is not an intensive property.
Explanation:
The intensive property of a substance is that property which does not depend on the mass or the amount of the substance.
The melting point of aluminum metal is 933 K.
The melting point of a substance does not depend on the amount of that substance, therefore, this is an intensive property.
A chemical reaction requires 3.00 g of oxygen.
It includes the mass of the oxygen, i.e., the amount of oxygen required from the reaction, therefore, it is not an intensive property.
The density of helium at 25°C is 1.64 × 10-4 g/cm3.
The density does not depend on the amount or mass of the substance, therefore, it is an intensive property.
Solid copper hydroxide is blue colored.
The color of a substance does not depend on its amount, therefore, it is an intensive property.