Q137CP - Chemistry: Molecular Nature Of Matter And Change

Question

The number of atoms in $\mathbf{1}{\mathbf{dm}}^{\mathbf{3}}$ aluminium is nearly the same as the number of atoms in $\mathbf{1}{\mathbf{dm}}^{\mathbf{3}}$ lead, but the densities of these metals are very different (see Table 1.5). Explain.

Step-by-Step Solution

Answer

Even though the two components have the same volume, they have different densities due to their distinct masses.

Step 1: Introduction to the Concept

Density is computed by dividing the mass by the volume, hence density is expressed in units, such as g/mL.

 $\mathbf{Density}\mathbf{=}\frac{\mathbf{mass}}{\mathbf{volume}}$

Step 2: Explanation

Given that the volume of both metals is the same. We can conclude that it is different because of the difference in mass because the density is different.

We have the same number of atoms, but their weights are different(due to the number of protons, neutrons, and electrons).