Why can't scientists collect temperature and volume data for an enclosed gas at temperatures near absolute zero.

Because a phenomenon called Bose-Einstein condensation can occur.

Explanation:

Bose-Einstein condensation is a phenomenon that can occur when a scientist works with temperatures close to absolute zero. In this situation, the material being analyzed is compacting, condensing, in a way that could become a large, single atom. When this happens, it is impossible to collect accurate temperature and volume data. This phenomenon occurs in the processes of temperature decay and physical state changes, in which the gas becomes liquid, the liquid becomes solid, and, in this way, the solid would tend to have its particles more and more united.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.