Pure Substances & Mixtures: Separation of Mixtures

Answer

A mixture is formed when two or more substances are combined physically without any chemical change. The components retain their individual properties and can be present in any proportion. Example: Ai…

Answer

A pure substance is made up of only one kind of particle (atoms or molecules) and has fixed properties. Examples: Gold (element), sugar (compound).

Answer

Air is a mixture because: 1. It contains gases like nitrogen, oxygen, CO₂ in variable proportions. 2. Each gas retains its own properties. 3. No chemical reaction occurs between them. 4. Can be separa…

Answer

Water is a compound because: 1. It is formed by a chemical reaction between hydrogen and oxygen in a fixed ratio (2:1). 2. Has fixed boiling and melting points. 3. Properties differ from its elements …

Answer

1. Homogeneous mixture – components are uniformly distributed (e.g., salt solution). 2. Heterogeneous mixture – components are not uniform and can be seen separately (e.g., sand and iron filings).

Answer

1. Salt dissolved in water. 2. Alcohol mixed with water. These appear uniform throughout and do not separate on standing.

Answer

1. Sand and water – layers form on standing. 2. Oil and water – immiscible liquids that separate. Components can be seen separately.

Answer

A solution is a homogeneous mixture of a solute (substance that dissolves) and a solvent (substance in which solute dissolves). Example: Sugar (solute) in water (solvent).