Na (s) + H20 (1) = NaOH (aq) + H2(g)
Balance and identify the type of the following reaction

It really doesn't matter for any of the questions that you've listed.

Ultra-high temperature (uht)

In the conservation of mass, mass (which is the same as energy) can never be created or destroyed in the same way oil is formed from the remains of small animals and plants that died and fell to the bottom of the sea and their mass (energy) is conserved as oil.