52. The reaction of calcium hydride, CaH2, with water can be characterized as a Lewis acid-base reaction: CaH2(s) + 2H2 O(l) ⟶ Ca(OH)2(aq) + 2H2(g)

Identify the Lewis acid and the Lewis base among the reactants. The reaction is also an

oxidation-reduction reaction. Identify the oxidizing agent, the reducing agent, and the changes in

oxidation number that occur in the reaction.

16. why must the number of electrons lost equal the number of electrons gained in every redox reaction? use 3 – 4 sentences in your own words to address this question. 18. what type of radiation is emitted when chromium-51 decays into manganese-51? show the nuclear equation that leads you to this answer. 19. a radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. what was the identity of the original nucleus? show the nuclear equation that leads you to this answer.

Why is the melting of ice a physical change ?

Which is an example of a highly unstable isotope that is often used in fission reactions?