Where does the energy in the explosion of a firecracker come from?

The transfer of heat through the movement of a gas or liquid a. convection b. conduction c. radiation

Find the mass by adding the numbers from the three sliders

What do the atoms of elements in the same group have in common? a. they have the same atomic numbers. b. they have the same average atomic masses. c. they have the same number of electron shells. d. they have the same number of electrons in their outermost shells.