Question

The rate of most reactions decreases over time because the decrease in concentration of the reactants

decreases the rate of successful collisions.

decreases the temperature of the system.

increases the pressure of the system.

interferes with the effectiveness of a catalyst.

Answer 1

@Johnbc

Answer 2

@JFraser @joemagee @JocelynStalnaker @jerrijones

Answer 3

think about it. If you start with lots of reactant molecules, as the reaction proceeds, the pile of reactants starts to get smaller. As that happens, there are fewer reactant molecules available to smash into each other, so the collisions decrease, and the reaction slows...

Answer 4

so A?

Answer 5

?????

Answer 6

It should be A be causing going off of what JFraser said if you start with lots of reactant molecules and the reaction proceeds the reaction is losing those molecules to create a successful collision so yes I would say A.

Answer 7

because*

Answer 8

thanks