Use the graph in Figure 1 to determine the initial rate of reaction for this experiment - AQA - A-Level Chemistry - Question 1 - 2020 - Paper 2

To find the initial rate of reaction, locate the tangent to the curve at time = 0.00 seconds on the graph. Measure the change in volume (in cm³) against the change in time (in seconds) to calculate the gradient. The slope of the tangent line represents the initial rate of reaction.

Using the tangent method:

1. Identify two points on the tangent line near time = 0.
2. Calculate the change in volume (e.g., from 0 to approximately 5 cm³) and the change in time (from 0 to 10 seconds).

This gives:

Initial Rate = ( \frac{\Delta V}{\Delta t} = \frac{5 \text{ cm}^3}{10 \text{ s}} = 0.5 \text{ cm}^3 \text{s}^{-1} )

Thus, the initial rate of reaction is 0.5 cm³/s.