Which of the following is an example of a chemical change?
a.
flour and sugar are sifted together into a measuring cup.

b.
a mixture of flour, sugar, eggs, and butter is baked to become a cake.

c.
the shell of an egg breaks when it is struck against a hard surface.

d.
chocolate squares are melted to make cake icing.

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.