Answer:
There are 4 other factors that affect the rate of reaction which may be responsible for the slowness of zinc powder namely :
1. concentration or pressure of a reactant.
2. temperature.
3. nature of the reactants.
Step-by-step explanation:
There are 5 factors that affect reaction rates:
1. surface area of a solid reactant.
2. concentration or pressure of a reactant.
3. temperature.
4. nature of the reactants.
5. presence/absence of a catalyst.