Question

When a substance is heated, the particles gain energy and move apart, increasing the volume. This phenomenon is called ______

thermodynamics
thermal contraction
thermal expansion
evaporation

When temperature increases, average _____ increases.

potential energy
kinetic energy
Gravitational potential energy
chemical energy
Can you help me please?

Answer 1

1. When a substance is heated, the particles gain energy and move apart increasing the volume. This phenomenon is called thermal expansion.

2. When temperature increases, average kinetic energy increases.

Step-by-step explanation:

Thermal expansion - the tendency of matter to change in volume in response to a change in temperature.

When the temperature of an object increases, the average kinetic energy of its particles increases while, when the average kinetic energy of its particles increases, the object's thermal energy increases.

The thermal energy of an object therefore increases as its temperature increases.