Why did a drop of water need to be added in order to initiate the reaction?
select one:
a. because the water is needed to wet the chlorine gas so the reaction could occur
b. because the water is needed to cool off the reaction so the flask will not explode
c. because the water is needed to remove a coating on the surface of the metal
d. because the water is needed to wet the sand and keep the reaction safe

b

Explanation:

if the flask explodes the reaction can't happen

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.