4. Justify Deciduous trees
have leaves that fall off
during some seasons. Might
you find deciduous trees in
the tropical zone? Why?

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

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.