C
Average kinetic energy and spacing of molecules increase with heat
D
Density increases with temperature
Correct Answer: Option C — Average kinetic energy and spacing of molecules increase with heat
Explanation:
When a solid is heated, the average kinetic energy of its molecules increases, causing them to vibrate more vigorously and occupy slightly m...
When a solid is heated, the average kinetic energy of its molecules increases, causing them to vibrate more vigorously and occupy slightly more space on average, leading to overall thermal expansion.