Scientists use the chemical and physical properties of matter to differentiate substances. Which of the following is a chemical property? (A) A starch sample turns blue when introduced to iodine
(B) Gold's property of malleability allow it to be shaped into a ring.
(C) Salts exhibit electrical conductivity.
(D) A metal is identified by its density.

a.) A starch sample turns blue when introduced to iodine

Explanation:

A is a chemical change whereas the other answers would be physical changes.

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.