Question 4 Which one of the graphs best represents the rate of the forward reaction versus time? A - VCE - SSCE Chemistry - Question 4 - 2010 - Paper 1

The graphs show the relationship between the rate of a chemical reaction and time. In this case, the reaction is forward and is influenced by the presence of a catalyst, with the possibility of becoming inhibited over time.

1. Graph I displays an initial increase in rate, plateauing over time, suggesting that the reaction reaches a steady state but does not indicate any inhibition over time.
2. Graph II shows a similar initial increase but eventually decreases; this indicates an effect, likely from a catalyst that is being poisoned over time.
3. Graph III suggests a constant rate throughout, indicating no change in reaction rate, which is not realistic for reactions that are influenced by catalysis or inhibition.
4. Graph IV shows an increase in rate that levels off after some time, which is a common representation of reactions approaching completion but still doesn't reflect inhibition.