Describe WHAT thermal energy does when added to matter

state the principle of separating two immiscible liquids by separating funnel. describe an activity with diagram to separate a mixture of water and kerosene oil. answer: immiscible layers separate out in layers depending on their densities in separating funne

just did the assignment and the answer was #1 +2 n

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.