Alkali metals, such as potassium, must be transported in special sealed containers because they have the ability to burn or explode upon contact with water due to their high reactivity. This is an example of a
A. None of these
B. Chemical change
C. Chemical property
D. Physical change

Alkali metals include lithium (Li), sodium (Na ) , potassium (K), rubidium (Rb), caesium (Cs), and franc (Fr) chemical elements. They shape Group 1, which is part of the s-block of a periodic table, along with hydrogen. All alkaline metals have their outermost electron in s-orbital, which gives very similar characteristic properties. This common electron configuration. Alkali metals, in addition, are the strongest indicators of group patterns in properties in a standard table and have well-characterized components with related behaviour. After its leading member, this family is also known as the lithium family.

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.

the answer is a and have a great day