Which two phrases require the removal of heat energy

The two phases that require the removal of heat are when a liquid turns to solid (e.g. freezing)  and when a gas turns to liquid (e.g. condensation)

Heat will leave the liquid as it freezes, and heat will leave the gas as it condenses into liquid.

The change in phase of a substance will always involve a change of heat. Heat, which is energy, either comes into the material during the phase change or heat comes out of the material during this change.

However, although the heat content of the material changes, the temperature does not, it remains the same during the phase change.

for 8 am not sure maybe yes?

for 9 if it is asking if the male is more or less it would be less

hope i even just a little : )

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called