Regents Chemistry Exam August 2025 Question 18 18.A sample of gas is in a sealed, rigid cylinder at constant volume. Which changes occur in the force of collisions of the gas particles and frequency of their collisions when the sample is cooled? (1)  Force of collisions decreases and frequency of collisions increases. (2)  Force of collisions decreases and frequency of collisions decreases. (3)  Force of collisions increases and frequency of collisions increases. (4)  Force o

Regents Chemistry Exam August 2025 Question 17 17 A reaction is most likely to occur when reactant particles collide with proper (1) energy and orientation (2) mass and volume (3) phase and charge (4) pressure and density Solution: In order for a reaction to occur, reactant particles needs to collide with enough energy and proper orientation. Choice 1 is the correct answer choice. LINKS: Regents Chemistry Guides and Solutions Chemistry Tutoring More Regents Chemistry Practice