August 2019 NY Regents Chemistry Exam
36 Which compound has covalent bonds?
(1) H2O
(2) Li2O
(3) Na2O
(4) K2O
Solution: Covalent bonds are formed between two nonmetals. Nonmetals can be found on the right side of the staircase on the Periodic Table. Hydrogen is a nonmetal as well.
Li, Na, and K are all metals and will form ionic bonds with oxygen.
Answer: 1
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