Which of these reactions can be classified as double replacement reactions?

a) zn + 2hcl → zncl2 + h2

b) 2nacl + f2 → 2naf + cl2

c) 2albr3 + 3k2so4 → 6kbr + al2(so4)3

d) 2k + mgbr2 → 2kbr + mg

Match the term to its description match term definition chemical energy a) internal energy caused by vibrations of atoms and molecules electrical energy b) electromagnetic energy that travels in waves radiant energy c) the movement of an electrical charge thermal energy d) potential energy stored in the bonds between atoms