Identifying the Pure Substance- Which One of the Following is the True Champion-

Which one of the following is a pure substance? This question often puzzles many individuals, especially those who are new to the field of chemistry. A pure substance is a type of matter that has a consistent and uniform composition throughout. It can be either an element or a compound. In this article, we will explore various examples of pure substances and help you identify which one fits the description.

Firstly, let’s define what a pure substance is. A pure substance is a material that has a constant and definite composition, meaning that it is made up of only one type of atom or molecule. This distinguishes it from a mixture, which consists of two or more substances that are physically combined but not chemically bonded. Now, let’s examine some common examples of pure substances.

One of the most well-known examples of a pure substance is oxygen gas (O2). Oxygen is an element, which means it is composed of only one type of atom. When you breathe in, you are taking in oxygen gas, which is a pure substance. Another example is gold (Au), which is also an element and a pure substance. Gold is highly valued for its beauty and durability, and it is used in jewelry, electronics, and various other applications.

On the other hand, compounds are also pure substances, as they have a fixed and consistent composition. Water (H2O) is a classic example of a compound. It is made up of two hydrogen atoms and one oxygen atom, and its composition never changes. Similarly, table salt (NaCl) is a compound composed of sodium and chlorine atoms. Both water and table salt are pure substances because their composition remains constant.

It is important to note that not all substances are pure substances. For instance, air is a mixture of various gases, including nitrogen, oxygen, carbon dioxide, and others. Therefore, air is not a pure substance. Another example is a solution, such as sugar dissolved in water. Although the sugar and water are pure substances individually, when they are mixed together, they form a mixture, not a pure substance.

In conclusion, a pure substance is a material that has a consistent and uniform composition, whether it is an element or a compound. Oxygen gas, gold, water, and table salt are all examples of pure substances. By understanding the difference between pure substances and mixtures, you can better appreciate the properties and applications of various materials in our daily lives. So, the next time you are asked which one of the following is a pure substance, you will be well-equipped to identify the correct answer.