A reaction occurs when solid X is placed into solution Y. As a result, the temperature of the new solution increases by 3 times degree C The temperature rises another 2 times degree C when more of solid X is added to the solution. What does this indicate about the effect of adding more solid?
Answer
A
It increased the space between the molecules and increased the reaction rate.
B
It decreased the number of molecular collisions.
C
It decreased the space between the molecules and lowered the reaction rate.
D
It increased the number of molecular collisions.
Explanation
The temperature rises again when more solid X is added, showing that additional reaction is releasing heat. Adding more reactant particles generally increases the number of collisions between particles, making more reactions occur. Therefore, the best choice is that it increased the number of molecular collisions.
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