If one material has a higher density than another, must the molecules of the first be heavier than those of the second? Explain.

Whether the molecules of higher density materials must be heavier than the molecules of lower density materials.
Answer to Problem 1Q
The molecules of higher density materials must not need to heavier than the molecules of lower density materials as the molecules of a high density material are tightly bounded.
Explanation of Solution
The density of materials is dependent on the arrangement of the molecules of the materials and concentration of atoms or molecules in a given volume. For a high density material, concentration of molecules is high as compared to the material having lower density.
The density of material does not depend on the size of the molecules. So the molecules of higher density materials must not need to heavier than the molecules of lower density materials as molecules of a high density material are tightly bounded.
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