Answer is: A. pure substance.
Pure substance is made of only one type of atom (chemical element) or only one type of molecule (chemical compound), it has definite and constant composition with distinct chemical properties.
Glucose is chemical compound composed of carbon, hydrogen and oxygen atoms connected with covalent bonds.
Pure substances can be separated chemically, not physically, that is difference between pure substances and mixtures.
Glucose [tex]\left({{{\text{C}}_6}{{\text{H}}_{12}}{{\text{O}}_6}}\right)[/tex] is classified as a [tex]\boxed{{\text{(A) pure substance}}}[/tex]
Further explanation:
Pure substances:
The substances that are made up of only one kind of atoms or molecules are known as pure substances. It is generally called as a chemical substance. Any substance is also said to be pure if it has a constant composition. Water, tin, diamond, sulfur, sodium chloride are some of the examples of pure substances.
Pure substances are of two types:
1. Elements:
An element is the simplest form of substance that cannot be broken down by any chemical methods. Every element has its own characteristic atomic number that is used to distinguish it from other elements. Copper, iron, neon, cobalt are examples of elements.
2. Compounds:
These are the substances formed by the chemical combination of two or more elements in a specific ratio. If the same elements are mixed in any other ratio, different compounds will be formed. These can be further broken down into their constituent elements.
Mixture:
The material that is made up of two or more substances is called a mixture. It has no fixed formula and its composition is also varied. All the individual constituents retain their properties after the formation of the mixture. Air, blood, concrete, and soda are some examples of mixtures.
(A) The chemical formula of glucose is [tex]{{\text{C}}_6}{{\text{H}}_{12}}{{\text{O}}_6}[/tex]. It implies it is an example of a compound that is formed from carbon, hydrogen and oxygen atoms. All the atoms are covalently bonded to each other and therefore glucose is a pure substance. Also, it can be broken down into its constituent particles when it undergoes any chemical change. So this statement (A) is correct.
(B) A homogeneous mixture that consist of two or more substances is known as a mixture. But glucose contains particles of glucose only. So this statement (B) is incorrect.
(C) The mixture has no fixed formula and its composition is also variable. But the chemical formula of glucose is [tex]{{\text{C}}_6}{{\text{H}}_{12}}{{\text{O}}_6}[/tex]. So this statement (C) is incorrect.
(D) An element is considered as the simplest substance that cannot be broken down into smaller particles. But glucose can further be broken down into carbon, hydrogen, and oxygen that are its constituent particles. So this statement (D) is incorrect.
Learn more:
1. Which sample is a pure substance? https://brainly.com/question/2227438
2. Which is a characteristic of a mixture? https://brainly.com/question/1917079
Answer details:
Grade: High School
Subject: Chemistry
Chapter: Elements, compounds, and mixtures
Keywords: mixture, pure substance, elements, compounds, formula, composition, simplest form of substance, glucose, C6H12O6, chemical combination, carbon, hydrogen, oxygen.
