1. what type of reaction is this?
244 pu+he+242u

Its a Nuclear reaction

Explanation:

A nuclear reaction is a type of reaction that involves the nucleus of an atom and does not affect the electrons like chemical reactions.The the reaction is known as a nuclear reaction;

       ²⁴⁴Pu+ ⁴He → ²⁴⁰U

The above type of nuclear reaction is an alpha decay in which a radioisotope Pu-244 undergoes alpha decay to form U-240.An Alpha particle is equivalent to the nucleus of a helium atom (⁴₂He).Therefore, when a radioisotope undergoes alpha decay the mass number decreases by 4 and the atomic number decreases by 2.

I'm not sure but i will try to find out

Putting salt in vinegar water