A student was studying chemical reactions. He followed these steps in an investigation:
1. Label one test tube X and another similar test tube Y.
2. Fill each test tube with 25 mL of the same acid solution.
3. Add 25 mL of the same salt solution to each test tube.
4. Carefully place test tube X in a beaker of water on a hot plate and increase the temperature.
5. Place test tube Y in a test tube holder on the table.
6. Record observations.
The student observed that a color change in test tube X occured faster than in test tube Y. Why did this happen?
O A. When the temperature was raised, the particles became lighter.
O B. Raising the temperature increased the number of particles in the test tube.
O c. When the temperature was raised, the particles collided faster.
OD. Raising the temperature increased the air pressure around the test tube.