Iron filings can be attracted by the magnet whereas salt can not. So the mixture can be separated by a magnet
In order of reactivity: magnesium, iron, copper, silver
Anything with a pH level of 3, 2, or 1.
ADSORPTION: The adhesion of a liquid or gas on the surface of a solid material, forming a thin film on the surface. Not to be confused with the process of absorption.
ABSORPTION: The act or process of absorbing or of being absorbed as