NY Regents Chemistry Exam August 2023 Question 14
14 Which sample can be classified as a substance?
(1) air
(2) argon
(3) soil
(4) seawater
Solution: A substance is either an element or a compound (fixed ratio of atoms such as CO2). Elements can be found on the Periodic Table. Argon is the only element listed and is the correct answer choice (2).
Soil, seawater and air are all mixtures because they are composed of multiple substances.
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