1. Finding Instantaneous Rate of Reaction from a Graph
1. The rate of reaction changes from time to time as the reaction happens.
2. The rate of reaction at a particular time is called the instantaneous rate.
3. The instantaneous rate of a reaction is equal to the gradient of tangent at a
particular time.
Rate of reaction = Δ(product) ÷ Δ(Time)
Example
The graph shows the volume of carbon dioxide gas released over time in a chemical
reaction. Find the rate of reaction at t = 40s.

2. Answer:
Rate of reaction at 40s = gradient of the tangent at 40s
Rate of reaction=132−48 /70−10=1.4cm3s−1