Three students are working with different substances to measure the chemical changes that occur. Chao is working with milk, Mia is working with carbon dioxide gas, and Ezra is working with rock. Which would best describe the way to treat each substance to get a faster reaction?

A faster reaction can be encouraged by changing conditions that increase how often particles collide. For milk, changing the temperature can speed up or slow down chemical reactions. For carbon dioxide gas, increasing the pressure packs the gas particles closer together, causing more frequent collisions. For rock, increasing the surface area exposes more material for reacting. Therefore, the best choice is the one that changes milk’s temperature, adjusts the gas’s pressure, and increases the rock’s surface area.

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