When ice cubes are added to warm lemonade, heat transfer occurs from the lemonade to the ice. The warmer lemonade molecules lose energy as they collide with the colder ice, causing the ice to absorb this energy and melt. As the ice melts, it cools the lemonade, lowering its overall temperature until thermal equilibrium is reached. This process continues until both the lemonade and the melted ice reach the same temperature.
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