Use the reaction equation and bond energies to answer the question 2H20 - 2H2 + O2
1
H-O: 467 kJ/mol
H-H: 432 kJ/mol
O=0.495 kJ/mol
What is the total energy of the reaction? Is this an endothermic or exothermic reaction?
(1 point)
O 509 kJ/mol, endothermic
O 509 kJ/mol, exothermic
O-509 kJ/mol, endothermic
-509 kJ/mol, exothermic

answer:

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

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

c. electrical charges of ionic bonds.