magnesium has a melting point of 650 degrees celsius, is silvery white, and is reactive with hydrogen in water. It is capable of forming alloys with other metals and has a density of 1.74g/cm3 classify the 5 properties mentioned as either physical or chemical property. Then explain how you know the difference

Chemical property : It is reactive with hydrogen

Physical property : magnesium has a melting point of 650 degrees celsius, It is silvery white,  it has a density of  ,   It is capable of forming alloys with other metals

Explanation:

Chemical property is defined as the property of a substance which is observed during a reaction where the chemical composition identity of the substance gets changed.  

Example: It is reactive with hydrogen

Physical property is defined as the property which can be measured and whose value describes the state of physical system. For Example: State, density etc.  

Example: 1. magnesium has a melting point of 650 degrees celsius,

2. It is silvery white.

3.  It is capable of forming alloys with other metals

4. It has a density of