Question

A beaker contains a mixture of sand and small pebbles. what kind of mixture is this?

Answer 1

Answer is: a beaker contains heterogeneous mixture.

A heterogeneous mixture have compounds that remain separate in the sample.

Heterogeneous mixture is not uniform in composition (in this mixture different sand and small pebbles), but proportions of its components (in this mixture particles of different colors and size) vary throughout the sample.