Question

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 when more of solid X is added to the solution. What does this indicate about the effect of adding more solid? It increased the number of molecular collisions. It decreased the number of molecular collisions. It decreased the space between the molecules and lowered the reaction rate. It increased the space between the molecules and increased the reaction rate

Answer 1

A It increased the number of molecular collisions.
Hope this helps

Answer 2

Answer: It increased the number of molecular collisions.

Justification:

The collision theory states the reaction is the result of the collisions between the particles (atoms, ions, or molecules).

The increase of the temperature as solid is added is the result of the reaction of solid X when it is placed into the solution.

Since, the main postulate of the collision theory is that the particles have to collide to react, the amount of particles is a decisive factor of the reaction rate. The raise of the temperature when the solid is added is an evidence of this postulate: more particles → more collisions → more reactions → increase in temperature.