Which sample is a pure substance? a test tube of zinc oxide a container of zinc and oxygen a flask of pond water a jar of soil
Answers
Pure substances: The substances that are built up of only one type of a molecule or an atom are called pure substances. The measure of how pure the substances are is referred to as purity of the substance.
Pure substances can be broken down into elements and compounds.
Zinc oxide is a compound which is a made up of one type of molecule. It is composed of two or more elements. They can be separated by chemical means. And so, zinc oxide is a pure substance.
Zinc is not a pure substance because it cannot be broken down into elements and compounds.
Pond water is also not pure because pond water is made up of various types of molecules.
Soil is also not pure because soil contains many types of molecules in it.
Hence, a test tube of zinc oxide is the answer.
A test tube of Zinc Oxide is the sample of a pure substance.
The pure substance can be defined as the type of the matter which cannot be divided or broken down into the simpler components without undergoing any chemical change.
Among the given options only the test tube of Zinc oxide can be the example of pure substance.