Final answer:
Ammonia consists of nitrogen and hydrogen, potassium oxide consists of potassium and oxygen, sucrose consists of carbon, hydrogen, and oxygen, and calcium sulfide consists of calcium and sulfur.
Step-by-step explanation:
a) The compound ammonia (NH3) consists of one nitrogen atom (N) bonded to three hydrogen atoms (H). Thus, the elements found in ammonia are nitrogen and hydrogen.
b) The compound potassium oxide (K2O) consists of two potassium atoms (K) bonded to one oxygen atom (O). Therefore, the elements found in potassium oxide are potassium and oxygen.
c) The compound sucrose (C12H22O11) consists of twelve carbon atoms (C), twenty-two hydrogen atoms (H), and eleven oxygen atoms (O). Hence, the elements found in sucrose are carbon, hydrogen, and oxygen.
d) The compound calcium sulfide (CaS) consists of one calcium atom (Ca) bonded to one sulfur atom (S). Thus, the elements found in calcium sulfide are calcium and sulfur.