Please help!
A chemist finds that when platinum is added to a reaction, the reaction speeds up. He thinks the platinum may be acting as a catalyst. What measurement should the chemist make to determine whether it is a catalyst?
Measure the mass of the platinum before and after the reaction.
Measure the temperature of the solution before and after the reaction.
Measure the change in volume of the solution.
Measure the amount of gas released by the reaction.

Question

Please help!
A chemist finds that when platinum is added to a reaction, the reaction speeds up. He thinks the platinum may be acting as a catalyst. What measurement should the chemist make to determine whether it is a catalyst?
 Measure the mass of the platinum before and after the reaction. 
 Measure the temperature of the solution before and after the reaction. 
 Measure the change in volume of the solution. 
 Measure the amount of gas released by the reaction.

anonymous · Answer

well a catalyst remains chemically unreacted after the reaction is complete...i.e its mass remains the same before and after the reaction so measuring the mass would tell him if its a catalyst or nt..