Answer: D: plutonium-239
Explanation: Got it right on the quiz
(ANS1)— P4 + 5O2 ---> 2P2O5
(ANS2)— C3H8 + 5O2---> 3CO2 + 4H20
(ANS3)— Ca2Si + 4Cl2 ---> 2CaCl2 + SiCl4
e.g. pliers, cutters, crimps, wire wrapping tools, etc., if youre meaning electronic hand tools