Tag: homogenous and heterogenous mixtures

A mixture is a material system made up of two or more different substances which are mixed but are not combined chemically. A homogeneous mixture is a type of mixture in which the composition is uniform and every part of the solution has the same properties. Salt, sugar, and many other substances dissolve in water to form homogeneous mixtures.

Air is a homogeneous mixture of a number of gases. It's two main constituents are oxygen and nitrogen. Other gases are present in small quantities.

The solution in which the concentration of solute is the same in every part of the solution is known as a homogeneous solution, sugar is completely soluble in water and forms homogeneous solution.

Air is a homogeneous mixture and can be separated into its components by fractional distillation.

Aqueous solution of low molecular mass are true solutions. A solution in which size of the solute particles is about $10^{10}$m is called a true solution.

A true solution has solute completely dissolved in the solvent. In case of chalk powder, it does not completely dissolve in water. Hence chalk powder in water is a heterogeneous mixture & is not a true solution.

Soluble substances are those that easily dissolve in a solvent, such as water, and include sugar, salt, alcohol and some dish-washing detergents. In chemistry, solubility of a substance is a quantitative term that refers to the amount of substance that can dissolve in a given volume of a solvent.

Amalgam used for dental filling in Ag - Sn amalgam.

Option A is the correct answer. 

A handful of soil is heterogeneous mixture of solids. It is not uniform in composition.