The enthalpy is the heat added to or lost in a system.
Answer: The physical properties of iron oxide are that it is an odorless, red-brown solid, and that it is insoluble. Depending on the chemical formula, one of the chemical properties is its combustibility. If the chemical formula is Fe2O3, it is not combustible. If the formula is FeO, it is readily combustible.
Physical properties of matter
I believe it’s Non polar molecule
C. the expansion of the universe is accelerating