Answer:
b. Add a catalyst.
Explanation:
Only B is correct.
The factors that affects the rate of chemical reactions are:
- Nature of the reactants
- Concentration of the reactants or pressure
- Temperature
- Presence of catalyst
- Sunlight
The rate of chemical reaction is a measure of the speed of the reaction.
When a foreign body is added to a reaction, the speed can be influenced. If the body increases the reaction rate, it is a positive catalyst. Catalysts are used to reduce the reaction time of many reactions.
