Which statement describes a chemical property of the element magnesium?
(1) magnesium is malleable.
(2) magnesium conducts electricity.
(3) magnesium reacts with an acid.
(4) magnesium has a high boiling point.

option 3) magnesioum reacts with an acid.


Justification:


1) Malleability, conduction of electricity, and boiling point are physical properties.


2) Maleability is the ability to be transformed into foil. It is just a change in form. So, it is a physical property.


3) The metals conduct electricity in virtue of the array of the atoms, which permtis the flow of the electrons, but it does not involve a chemical change, so it remains being a physical proerty.


4) Boling point is the temperature at which a substance passes from liquid state to gas state, which are just different forms of the same substance. So, it is other physical property.


5) Reaction with an acid is indeed a chemical transformation: the metal (magnessium) will form a chemical bond with some spieces of the acid to form a new compound. This is a chemical reaction in virtue of the chemcial properties of the substance (its ability to react with acids)