Consider an iron cube and an aluminum cube If the two cubes were at the same temperature, how would the average kinetic energy of the particles in iron compare with the average kinetic energy of the particles in aluminum? The average kinetic energy of the iron particles would be greater. There would be no difference in the average kinetic energies. No determination can be made based on the information given. The average kinetic energy of the aluminum particles would be greater.

## Step 1<br />The problem involves understanding the kinetic theory of matter, which states that the average kinetic energy of particles in a substance is directly proportional to the temperature of the substance. This theory applies to all states of matter, including solids, liquids, and gases.<br /><br />## Step 2<br />The problem specifies that the iron cube and the aluminum cube are at the same temperature. According to the kinetic theory of matter, this means that the average kinetic energy of the particles in both the iron cube and the aluminum cube should be the same.<br /><br />## Step 3<br />The problem also mentions that the cubes are made of different materials, iron and aluminum. However, the kinetic theory of matter does not take into account the type of substance. It only considers the temperature. Therefore, the fact that the cubes are made of different materials does not affect the average kinetic energy of the particles in each cube.