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A pure substance or chemical substance is a material that has a constant composition (is homogeneous) and has consistent properties throughout the sample. A pure substance participates in a chemical reaction to form predictable products. In chemistry, a pure substance consists only of one type of atom, molecule, or compound.


The correct answer is A. A test tube of zinc oxide. Zinc oxide is a compound which is a pure substance composed of two or more elements. They can only be separated or broken down into its individual elements or smaller compounds by chemical means.


In chemistry, a pure substance is defined as a matter which has definite composition, constant composition and unique chemical properties. Another word for pure substance is chemical substance. A pure substance can be an element or a compound. Examples of pure substances are water, silver, zinc oxide, table salt, ethanol, etc.


Pure substances. A pure substance has a definite and constant composition — like salt or sugar. A pure substance can be either an element or a compound, but the composition of a pure substance doesn’t vary. Elements. An element is composed of a single kind of atom. An atom is the smallest particle of an element that still has all the properties of the element.


Pure Substances & Mixtures. Chapter 2-Section1. STUDY. PLAY. chemistry. the study of matter and its changes. ... a substance made up of atoms of two or more different elements joined by chemical bonds in a fixed proportion. ... pure substance. any matter that has a fixed composition and definite properties. Pure substances are NOT.


Chemistry - Elements, Compounds, and Mixtures. STUDY. PLAY. What is a pure substance? A pure substance is a type of matter that cannot be broken down into simpler components without undergoing a chemical change. What is an element? ... Which sample is a pure substance? A)a test tube of zinc oxide B)a container of zinc and oxygen


A pure substance contain only one type of substance (an element or a compound). A pure substance hence has a fixed melting and boiling. Hence, honey and air is never pure from the scientific point of view. One should not mix up the meaning of “pure” in science with daily used language.


In chemistry, a pure substance is a sample of matter with both definite and constant composition and distinct chemical properties.To avoid confusion, a pure substance is often referred to as a "chemical substance."


All elements by themselves are pure substances. For example, gold, diamond, tin, etc. Chemical compounds can be pure substances as well. For example, water (distilled) is a pure substance. However, when you add any other substance to the water (eg. salt), it becomes a mixture and is no longer pure.


A pure substance consists of only one type of substance not mixed with others. In contrast, a mixture is a substance which has two or more different substances mixed together (not chemically combined). In this chapter, we would look into how to differentiate if a substance is pure (or is it a mixture).