Changes in Volume

Definition:

• Measuring the rate of a chemical reaction involves observing how quickly reactants transform into products.

Importance:

• Vital for understanding reaction speed.
• Essential in industry and scientific research.

Changes in Volume:

1. Another method to measure the rate is by monitoring changes in volume.

Example:

• Imagine a reaction where gas A transforms into another gas B.
• At the start, the volume of gas A is 100 cm³.
• After 2 minutes, the volume of gas A is 80 cm³.
• The change in volume of A is 100 cm³ - 80 cm³ = 20 cm³.
• The time taken is 2 minutes, which is 120 seconds.
• Rate of reaction = $\frac{\text{Change in volume of A}}{\text{Time}} = \frac{20 \text{ cm}^3}{120 \text{ s}} = :highlight[0.167 \text{ cm}^3/\text{s}]$.

Units:

• Rate of reaction is measured in cubic centimetres per second (cm³/s).
• It indicates how many cubic centimetres of gas disappear or form per second.