Neither properly describes it. All attractions are forces, and there are only four forces in the known universe: gravity, weak nuclear, strong nuclear, and electromagnetic. Magnet attractions are electromagnetic. Both physical forces (that are not gravity) and chemical forces are also classified as electromagnetic forces. So neither physical or chemical properly describes a magnetic force, although classical physics would be more accurate to say than chemical.
Luster is not a change, it is a characteristic.
Reactivity is not a physical property because it's a characteristic of a chemical element or compound and is involved in chemical process.
No. Iron is naturally magnetic.
The heat conductivity of a substance does not involve changes to its chemistry. Heat conductivity is a physical change and characteristic to a substance.
A physical change
physical property
Dissolution is physical change.
The flexibility is a physical characteristic of materials.
Magnetism is a physical property that is mediated by magnetic fields.The magnetic state of a material depends on temperature (and other variables, such as pressure and the applied magnetic field), so a material may exhibit more than one form of magnetism depending on its temperature, etc. However, a material's magnetism doesn't change the composition, and doesn't involve a chemical reaction.
The opposite of a physical characteristic would be a non-physical characteristic, such as personality traits or emotions. These are aspects of a person that are mental or emotional in nature, rather than related to their physical appearance or abilities.
Chemical equibrium can involve changes in chemical properties.
Building a tower of magnetic blocks is a physical change because the blocks are simply being rearranged without any chemical reactions taking place. The properties of the blocks themselves remain the same.
Reversibility of reactions is a characteristic of chemical equilibrium but not physical equilibrium. In chemical equilibrium, the forward and reverse reactions continue to occur, while in physical equilibrium, there is no net change in the physical state of a substance.
Luster is not a change, it is a characteristic.
Sun spots are physical phenomenons produced by difference of tenperatures between various regions of the Sun surface.
A substance that is formed from one type of atoms with a characteristic set of physical and chemical properties is called an element.
Reactivity is not a physical property because it's a characteristic of a chemical element or compound and is involved in chemical process.