Question

which statement best describes the difference between a substance at 50°c and at 20°c? a the average electrical energy of the particles is higher at 50°c. b the density of the substance is higher at 50°c. c the average kinetic energy of the particles is higher at 50°c. d the mass of the substance is greater at 50°c.

Explanation:

Temperature is a measure of the average kinetic energy of the particles in a substance. Higher temperature means higher average kinetic energy of particles. Electrical energy is not related to temperature in this context. Density and mass of a substance are generally not directly determined by temperature in the way described in options B and D for a simple comparison of two temperatures without other context - like phase - change or volume - change information.

Answer:

C. The average kinetic energy of the particles is higher at 50°C.