Which of the following observations would indicate that a material is a pure substance?
It does not dissolve in water.
It changes color after heating.
It cannot be physically broken down into different types of atoms.
It can be physically broken down into different types of molecules.
893

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.

they are made of gases.

they have a spherical shape.

they make energy through fusion.

5.6⋅10−^19  j

do you need the explaination?