classify the following compounds as ionic (metal + nonmetal) , covalent (nonmetal + nonmetal) or both (compound containing a poly atomic ion)

In any energy conversion, some of the energy is lost to the environment as question 5 options: electrical energy potential energy sound energy thermal energy

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

What does the mass of 0.7891 mol of ferric oxide (fe2o3)