Why does platinum metal make a good catalytic surface for reactant molecules?
a. it causes reactant molecules to be less reactive.
b. it strengthens bonds between reactant molecules.
c. it prevents products from breaking away from the surface.
d. it holds reactant molecules in a good position for them to react.

d.It holds reactant molecules in a good position for them to react.

Catalysts are those substances which increases the rate of reaction without itself being consumed in the reaction.

Platinum metal has active sites on its surface and thus reactant molecules can be brought into closer contact with one another. If more molecules can be brought closer together, there is better chance of an effective collision and thus the rate of reaction increases and it acts as a good catalytic surface.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.