Ionic compounds have high melting points. this can best be explained by the fact that the bonds in ionic compounds a. involve the sharing of electrons. b. require a great deal of energy to break. c. occur between metals and nonmetals. d. form between a positively charged atom and a negatively charged atom.

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

c. magnitude and direction