Question

Identify elements, compounds and mixtures from the following: oxygen gas, iron, sugar, salt, hydrogen gas, sand, brass, soap, surf, sugar syrup, sherbet, air.

Answer 1

Hint: The objects around us are created out of matter and matter is anything which occupies space and has definite mass. Matter is present in three forms which are classified as elements, compounds and mixtures.

Complete Solution :To identify the given examples we have to know about all the terms Elements: An element is defined as a substance which cannot be split up into two or more simpler substances by the usual chemical methods like by applying heat, light or electric energy.
An element is made up of only one kind of atom that cannot be split up into two or more simpler substances.
- Compound: A compound is a substance which is made up of two or more elements chemically combined in a fixed proportion by mass and a compound cannot be separated into its component by physical methods.
- Mixtures: A mixture is a substance which consists of two or more elements that are compounds not chemically combined together. All the solutions are mixtures.
Hence from the above definitions we can classify them as:

Elements	Iron, brass, oxygen gas, hydrogen gas
Compound	Sugar, Salt, Soap, Surf
Mixture	Sherbet, air, sugar syrup, sand

Note: Atoms of an element are similar in their properties. While compounds and mixtures show distinct properties as they are made up of two or more substances and mixture can be of two types which are named as homogeneous mixture and heterogeneous mixture.