Question

which item is a pure substance?
○ sugar
○ ocean water
○ iced tea
○ a penny

Explanation:

A pure substance has a uniform and definite composition. Sugar (sucrose, \(C_{12}H_{22}O_{11}\)) has a definite chemical formula and uniform composition. Ocean water is a mixture of water, salts, etc. Iced - tea is a mixture of tea, water, sugar (if added), etc. A penny (modern US penny is made of zinc with a copper coating) is an alloy (a mixture of metals).

Answer:

sugar