II. Directions: Read and answer carefully. Select the choice that best answers the question or completes the statement. Write the letter of your answer on the space provided before each number. 1. What are the two classifications of pure substances? A. Elements and mixtures B. Atoms and elements C. Atoms and molecules D. Elements and compounds 2. An element is a pure substance which is composed of only A.one type of compound B. one type of element c. one type of molecule D. one type of atom 3. A compound is a substance which is composed of A. one type of element C. two types of atoms B. one type of atom D. more than one type of element 4. Which of the following is true for both elements and compounds? A. They are homogeneous. C. They are commonly found free in nature. B. They are the simplest form of matter. D. They can be broken down into simpler substances. 5. What are the elements present in CO2? A. Sodium and Chlorine C. Hydrogen and Oxygen B. Carbon and Oxygen D. Sodium and Oxygen​