Question

which of these is not a pure substance? lemonade h2o the element gold

Explanation:

A pure substance has a uniform and definite composition. \(H_2O\) (water) is a compound (a type of pure substance), and gold (\(Au\)) is an element (a type of pure substance). Lemonade is a mixture of water, sugar, lemon juice etc., so it is not a pure substance.

Answer:

lemonade