The directions say to find the formula then balance the equation and state which kind of chemical reaction the formula is: synthesis, decomposition, single-replacement, double-replacement, or combustion. When strongly heated, magnesium sulfide formed a yellow crystalline deposit on the walls of a sealed reaction vessel. Metallic deposits were found on the bottom of the container.
- my teacher told me it was decomposition
all I have is MgS⇒

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

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.

the volume increases