Question 5 • HCISD-Integrated Physics and Chemistry A-CR SUMMER
Pellets of calcium chloride are spread on a sidewalk covered in water that is 36°C. Under which circumstance will the calcium chloride dissolve faster?Sand is sprinkled on the sidewalk.The water cools to a temperature of 33°C.People walking on the sidewalk crush the calcium chloride pellets. The air pressure increases as the weather changes.
Answer
A
Sand is sprinkled on the sidewalk.
B
The water cools to a temperature of 33°C.
C
People walking on the sidewalk crush the calcium chloride pellets.
D
The air pressure increases as the weather changes.
Explanation
Crushing the calcium chloride pellets breaks them into smaller pieces, increasing the total surface area in contact with the water. More contact with the water allows the calcium chloride to dissolve faster. Sand and changes in air pressure do not increase the rate of dissolving, and cooling the water would generally slow it down.
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