Is combining hydrogen peroxide with manganese dioxide a chemical or physical change?

the answer would be c

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.

i think it is true since you can test the answer and can use observations to complete it.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.