Question

Classify the following as homogeneous and heterogeneous mixture:

blood

Answer 1

Mixture: When two or more substances are mixed in any proportion.

• The components of a mixture can be separated by physical methods of separation.
• Example: A mixture of Sand and Iron $\left(\mathrm{Fe}\right)$ can be separated by the use of a magnet.

Homogeneous mixture: A mixture that exhibits uniformity in its composition and properties throughout its mass is known as a homogeneous mixture.Example: Sodium chloride $\left(\mathrm{NaCl}\right)$ solution, Sugar $\left({\mathrm{C}}_{12}{\mathrm{H}}_{22}{\mathrm{O}}_{11}\right)$ solution etc.

Heterogeneous mixture: A mixture that does not exhibit uniformity in its composition and properties throughout its mass is known as a heterogeneous mixture. Example: Muddy water, Sand and Iron $\left(\mathrm{Fe}\right)$ nails combined together.

Blood is a heterogeneous mixture. This is because:

• Blood consists of various types of cells, proteins along with plasma most of which is water i.e.; there is no uniformity in the composition of blood throughout.
• There is a clear boundary of separation of the cells which separates them from the plasma of blood.
• The blood cells (white blood cells, red blood cells, etc.) can be separated using the physical method of separation called centrifugation.