In the laboratory, a student investigates the effect of concentration on the reaction between hcl(aq) and mg(s), changing only the concentration of hcl(aq). data for two trials in the investigation are shown in the table below.

trial 1
volume of hci (aq): 50.0ml
concentration of hci (aq): 0.2m
mass of mg(s): 0.1g
reaction time: 48 seconds

trial 2
volume of hci (aq): 50.0ml
concentration of hci (aq): 0.2m
mass of mg(s): 0.1g
reaction time: 48 seconds

compared to trial 1, what is the expected reaction time for trial 2 and the explanationfor that result?

(1) less than 48 s, because there are fewer effective particle collisionsper second
(2) than 48 s, because there are more effective particle collisions per second
(3) more than 48 s, because there are fewer effective particle collisions per second
(4) more than 48 s, because there are more effective particle collisions per second