Chapter 3, Problem 13STP

Interpretation Introduction

Interpretation:

Whether the mixture is homogeneous or heterogeneous is to be determined.

Concept introduction:

Homogeneous mixture: In a homogeneous mixture the components are found in uniform, the component distribution is evenly throughout the mixture. The components are cannot be separated.

Heterogeneous mixture: The heterogeneous mixture has two or more phases. The component of the mixture can be separated easily. The distribution is not uniform.

Answer to Problem 13STP

The given mixture is heterogeneous because the size of sawdust is almost negligible and mothball flakes are larger and the table salt found in crystal form. The overall mixture has three components with different size and color which can distinguish.

Explanation of Solution

The given table is:

SELECTED PROPERTIES OF SUBSTANCES IN A MIXTURE
Item	Soluble in the water?	Soluble in alcohol?	Density ( ${\text{g/cm}}^{\text{3}}$ )	Particle size(mm)
sawdust	no	no	$0.21$	$1$
mothball	no	yes	$1.15$	$3$
Table salt	yes	no	$2.17$	$2$

From the given information the particle size is different and their density is different. So, they can be easily differentiated from the mixture, the properties are different and not present in a uniform manner. Hence, it is a heterogeneous mixture.

Conclusion

The mixture is heterogeneous, with three different components and their properties are different from each other.