Janice mixed an orange solution of sodium sulfide with a clear solution of hydrochloric acid. She noticed after a minute that the
solution smelled something like rotten eggs.
What could she reasonably infer from the odor released by the solution?
A. Hydrochloric acid must smell like rotton eggs.
B.
A chemical reaction may have occurred.
C.
A chemical reaction must have occurred.
D. Chemical changes always produce odors.

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.