When you add cold milk and hot chocolate, they will slowly blend as the cooler liquid mixes with the warmer liquid. Eventually, the heat will be spread out evenly through the entire liquid. Which statement best explains why this happens?

Question

When you add cold milk and hot chocolate, they will slowly blend as the cooler liquid mixes with the warmer liquid. Eventually, the heat will be spread out evenly through the entire liquid. Which statement best explains why this happens?
A. The molecules of the two liquids form chemical bonds to spread energy.
B. Cold liquids rise and hot liquids sink making the liquids mix.
C. The liquids attract each other because the densities of the liquids are the same.
D. Heat always moves from areas of higher temperature to areas of lower temperature.

GPT-4o mini · Answer

The statement that best explains why the cold milk and hot chocolate eventually blend and reach an even temperature is:

D. Heat always moves from areas of higher temperature to areas of lower temperature.

This is the principle of thermal equilibrium, where heat energy will flow from the hotter liquid (hot chocolate) to the cooler liquid (cold milk) until both reach the same temperature.