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Solution: Which of the following are mixtures? Check all that apply. (a) water (H2O) (b) salt (NaCl) (c) salt water (d) air (mostly N2 and O2)

Problem

Which of the following are mixtures? Check all that apply. 

(a) water (H₂O) 

(b) salt (NaCl) 

(c) salt water 

(d) air (mostly N₂ and O₂)

Solution

We’re being asked to identify the mixture/s among the given.

Recall that mixtures are combinations of two or more pure substances (elements or compounds). 

Mixtures are not chemically combined.

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