Which one of the graphs best represents the concentration of product C versus time? A - VCE - SSCE Chemistry - Question 5 - 2010 - Paper 1

To determine which graph represents the concentration of product C over time, we must consider how the concentration typically behaves during a reaction. Initially, at time t₁, there is a concentration increase as the product is formed until it reaches a plateau when equilibrium is achieved.

Upon examining each graph:

• Graph I shows a constant concentration which is not plausible as product formation does not remain static.
• Graph II indicates a sudden drop in concentration, which suggests a depletion of the product, contrary to the expected trend.
• Graph III illustrates a gradual increase followed by a stabilization at a certain concentration level, accurately representing the expected behavior for product formation over time.
• Graph IV displays an increase and then a slight decline which would indicate an eventual breakdown of the product, again not suitable for concentration representation.

Thus, the correct representation of the concentration of product C over time is Graph III. The correct answer is C.