Question

Which of the following is a pure substance?

A) Salt Water


B) Carbon Dioxide


C) Air


D) Soda

Answer 1

it is answer D) Soda

Answer 2

B) Carbon Dioxide should be your answer

D) Soda is not your answer, because it is made up of sugar, water, and carbon
C) Air is not your answer, for Air contains Hydrogen, Carbon Dioxide, Oxygen, and others
A) Salt Water is not your answer, for Salt Water contains Water and Salt

hope this helps