CH-1675
Concentration and pressure
Chemistry · Secondary 4 · Medium · Concentration and pressure
In an iodine clock experiment, solution A takes 40 s to turn blue-black, while solution B, with a higher concentration of iodide ions, takes 20 s. How does increasing concentration affect the rate of reaction?
- It increases the rate by increasing the frequency of effective collisions.
- It decreases the rate by reducing the energy of collisions.
- It does not change the rate because activation energy is unchanged.
- It stops the reaction once a maximum concentration is reached.
Sign in to check your answer and see the hint and the worked explanation. Free on PrepLab High.