January 2020 NY Regents Chemistry Exam
39 Which equation represents a single replacement reaction?
(1) 2Al(s) + 3Cl2(g) → 2AlCl3(s)
(2) 2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2(g)
(3) 2AlCl3(s) → 2Al(s) + 3Cl2(g)
(4) AlCl3(aq) + 3KOH(aq) → Al(OH)3(s) + 3KCl(aq)
Solution: In a single replacement reaction, one element replaces another: A +BC --> B +AC
Answer: 2
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