Question

In which case would the kinetic energy of particles be increasing? (1 point)
Responses

Metal is melted at 1,300°C.
Metal is melted at 1,300°C.

Metal is cooled at 1,300°C.
Metal is cooled at 1,300°C.

Metal is heated from room temperature to 200°C.
Metal is heated from room temperature to 200°C.

Metal is at room temperature, 37°C.

Answer 1

Metal is heated from room temperature to 200°C.

Reason: particle kinetic energy is proportional to temperature, so heating raises kinetic energy. During melting (at a constant melting temperature) the added energy goes into changing phase (potential energy), not increasing kinetic energy. Cooling decreases kinetic energy; a constant temperature (room temp) does not increase it.