Question

A material contains different substances and different crystals. Which of the following statements best describes this material?

a. The material is a homogeneous mixture with uniform composition.
b. The material is a heterogeneous mixture with non-uniform composition.
c. The material is a pure substance with a single crystal structure.
d. The material is a compound composed of different elements.

Answer 1

The material in question is a heterogeneous mixture with non-uniform composition due to the presence of different substances and crystals.

Step-by-step explanation:

If a material contains different substances and different crystals, the best description for it would be that the material is a heterogeneous mixture with non-uniform composition. An example of a heterogeneous mixture is soil, as it is composed of a variety of different materials and its composition is not uniform throughout. On the other hand, a homogeneous mixture has a uniform composition where the different components cannot be seen, like salt dissolved in water. Pure substances can be either elements, which consist of only one type of atom, or compounds, which have a fixed ratio of two or more types of atoms.