For Each of the Following, Indicate Whether a Physical or Chemical

For each of the following, indicate whether a physical or chemical change occurs.
A)Mercury(II) oxide is heated and forms mercury metal (Hg) and oxygen gas (O₂).
B)Liquid mercury is cooled to -40 $\degree$ C, at which point it solidifies.
C)A glowing match is thrust into hot oxygen gas and bursts into flame.
D)Water vapor condenses on a cool surface.