
Concept explainers
Interpretation:
The properties of seawater that illustrate the two characteristics of mixtures is to be determined.
Concept introduction:
The mixture is a material that is formed by two or more substances. It has no fixed formula but has a variable composition. It can be homogenous or heterogeneous. Homogenous mixtures are those which have uniform composition throughout the mixture while heterogenous mixtures do not have uniform composition throughout the mixture. The properties of the individual substances are retained even after the formation of mixtures. Air is a homogenous mixture whereas concrete is a heterogeneous mixture.

Answer to Problem 13.1P
The retained properties of constituents and the variable composition of seawater illustrate the characteristics of mixtures.
Explanation of Solution
Seawater or salt water contains water, some amino acids, sodium chloride, and some other dissolved ions. Its components never change and therefore the identities of its constituents are retained in seawater. The seawater has no fixed formula and its composition varies which is also a property of all mixtures.
The retained properties of constituents and the variable composition of seawater illustrate the characteristics of mixtures.
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Chapter 13 Solutions
Chemistry: The Molecular Nature of Matter and Change
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