A reaction occurs when solid X is placed into solution Y.
As a result, the temperature of the new solution increases by 3°C the temperature rises another 2°C one more of the solid X is added to the solution. What does this indicate about the effect of adding more solid?

1. It increases the number of molecular collisions
2. Decrease molecular collisions
3 decreases the space between molecules
4. Increased the space between the molecules