June 2023 Regents Chemistry Exam
7 Which substance can be broken down by a chemical change?
(1) cobalt
(2) ethane
(3) krypton
(4) manganese
Solution: Compounds can be broken down by a chemical change. Elements can not be broken down by a chemical change. Cobalt, krypton and manganese are elements and can be found on the Periodic Table (their names can be found in Table S). We can eliminate choices 1,3 and 4.
Answer: 2
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