which statement correctly describes why a compound is a pure substance?\na compound is not a pure substance…

which statement correctly describes why a compound is a pure substance?\na compound is not a pure substance because each of its molecules is made up of the atoms of two or more different elements.\na compound is a pure substance because its molecule cannot be broken down into simpler particles by physical means.\na compound is not a pure substance because it is not an element, and only elements are pure substances.\na compound is a pure substance because it consists of two different elements, which are pure substances.

which statement correctly describes why a compound is a pure substance?\na compound is not a pure substance because each of its molecules is made up of the atoms of two or more different elements.\na compound is a pure substance because its molecule cannot be broken down into simpler particles by physical means.\na compound is not a pure substance because it is not an element, and only elements are pure substances.\na compound is a pure substance because it consists of two different elements, which are pure substances.

Answer

Brief Explanations:

A pure substance has a fixed - composition. A compound has a definite chemical formula and its molecules are held together by chemical bonds. Physical means like filtration, evaporation etc. cannot break down the molecules of a compound into simpler substances. Elements are also pure substances but compounds are pure substances too because of their definite composition and inability to be separated by physical methods.

Answer:

A compound is a pure substance because its molecule cannot be broken down into simpler particles by physical means.