What is a coefficient in a chemical equation? a. the subscript after an atomic symbol b. a subscript before an atomic symbol c. a number following an elemental or molecular symbol d. a number preceding an elemental or molecular symbol

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.