In which situation will the reaction rate increase

A) when a catalyst is added  

Explanation:

The missing options are:

A) when a catalyst is added  

B) when the temperature drops  

C) when the pressure is lowered  

D) when the molecules are large and bulky

A catalyst increases the rate of a chemical reaction without undergoing a permanent chemical change.  They provide an alternative pathway to the reaction which has a lower activation energy than the non-catalyzed mechanism, this increase the reaction rate.

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.