Question

phase changes
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consider the statement below.
“when nitrogen is liquefied, heat is released.”
is this statement true or false?
it is false because nitrogen absorbs heat when it is liquefied.
it is false because nitrogen cannot absorb enough heat to liquefy.
it is true because heat is released when a gas changes to a liquid.
it is true because heat is released when a liquid changes to a gas.

Explanation:

Liquefaction is a phase change from gas to liquid. This is an exothermic process, meaning the system (nitrogen gas) releases heat as its particles slow down and form a more ordered liquid state. The other options are incorrect: nitrogen can be liquefied, and it releases (not absorbs) heat during this process, while liquid to gas is endothermic (absorbs heat).

Answer:

It is true because heat is released when a gas changes to a liquid.