Regents Chemistry Exam August 2024 Question 12
12 Which phrase describes a sample of NaCl(s)?
(1) a mixture that has constant composition and properties throughout
(2) a mixture that varies in both composition and properties
(3) a substance that has constant composition and properties throughout
(4) a substance that varies in both composition and properties
Solution:
A compound consists of two or more elements in fixed ratio. Compounds and elements are substances. The composition of a compound is constant. NaCl (s) is a compound. Choice 3 is the correct answer.
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