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?
Answer
A
Chao should change the temperature, Mia should adjust the concentration, and Ezra should decrease the surface area.
B
Chao should change the temperature, Mia should adjust the pressure, and Ezra should increase the surface area.
C
Chao should change the concentration, Mia should adjust the temperature, and Ezra should increase the surface area.
D
Chao should change the concentration, Mia should adjust the pressure, and Ezra should decrease the surface area.
Explanation
Increasing temperature generally speeds up reactions because particles move faster and collide more often with enough energy to react. Increasing the pressure of carbon dioxide gas brings its particles closer together, increasing collisions. Breaking rock into smaller pieces increases its surface area, allowing more of it to react at once; these changes match choice B.
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