Graph I rate | | |_____ | | | | |________________ time t1 Graph II rate | | |_____ | | | |________________ time t1 Graph III rate | | |_____ | | | |________________ time t1 Graph IV rate | | | | | |_____ |________________ time t1 Which one of the graphs best represents the rate of the forward reaction versus time? A - VCE - SSCE Chemistry - Question 4 - 2010 - Paper 1

To determine the correct graph, we need to analyze how the rate of the forward reaction changes over time. Typically, the rate of a forward reaction will initially increase, then plateau as the reactants are consumed and the reaction approaches equilibrium.

Step 1: Analyze Graph I: This graph shows a constant rate after a short period which implies no further reaction is occurring, not representing a forward reaction accurately.

Step 2: Analyze Graph II: This graph shows a sudden increase then a plateau, indicating that after some time the reaction reaches a steady state, making it a viable candidate.

Step 3: Analyze Graph III: This graph does not show any increase in rate, suggesting that the reaction is not taking place, which isn't accurate for a forward reaction.

Step 4: Analyze Graph IV: This graph indicates a steady increase in rate, suggesting that the forward reaction continues without reaching an equilibrium, which is inconsistent with the typical behavior.

Thus, based on the analysis, Graph II accurately represents the rate of the forward reaction over time, with a clear initial increase leading to a plateau.