Which one of the following is a pure substance?
A) wood
B) concrete
C) salt water
D) milk
E) elemental copper

Question

Quizplus · Accepted Answer

Elemental copper is a pure substance because it is composed of only one type of atom, which is copper. Option A is a mixture of various organic compounds, option B is a mixture of cement, sand, and water, option C is a mixture of salt and water, and option D is a mixture of various organic and inorganic compounds.

Which One of the Following Is a Pure Substance