Question

Is iced water a pure substance? Why?

Answer 1

Hint: In chemistry, a pure substance is said to be a sample of matter which consists of distinct chemical properties and has both definite and constant composition. In simple words, pure substances are composed of only one kind of particle and consist of a fixed structure.

Complete answer:
A pure substance is further classified as follows:
Elements: An element is a substance which consists of only one kind of atom i.e., it cannot be broken to further transform it into a new substance either by any physical or chemical change. Some of the examples of elements include metals, nonmetals, etc.
Compounds: A compound is the pure substance which is formed by a chemical combination of elements in a fixed ratio. However, a compound can be broken into its simple elements by means of chemical methods. Examples include water, baking soda, etc.
Some characteristic properties of a pure substance:
1. These substances are generally homogeneous in nature.
2. The composition of elements is uniform.
3. The pure substances consist of fixed melting and boiling points.
4. It participates in a chemical reaction to produce predictable products.
Iced water is considered as a pure substance because it is a compound which consists of hydrogen and oxygen atoms chemically bonded in a fixed ratio i.e., it exists as ${H_2}O$.
Therefore, we can conclude that iced water is a pure substance.

Note:
Remember that pure substances differ from mixtures as pure substances are made up of a single element or compound and consist of fixed physical properties whereas in mixtures several compounds and elements combine together to form a mixture and identity of each substance is retained in the mixture.