The graph shows the change in temperature of a sample of water in a closed system as thermal energy is added over time. 12 Temperature (°C) 150°C 100°C. 50°C 0°C -50°C 10 20 30 40 40 50 60 60 Time (min) What happens in the water during changes of state? A. Its particles move at a lower speed. B. Its particles maintain a constant speed. C. Its temperature varies constantly. D. Its temperature increases slowly.
