1. Which of the following are considered pure substances A compounds C. both elements and compounds B elements neither elements nor compounds

2 Which of the following are pure substances? A on and brass B tin and air C on and salt D. brass and salt

3. Which of the following statements is true for both elements and compounds? A They are homogeneous B They are the simplest form of matter C They are commonly found free in nature. D They can be broken down into simpler substances.

4. Which does NOT describe a metal? Metals are A ductile C. good insulators B. malleable D. good conductors of heat

5. Which of the following elements has the symbol C? A Carbon B. Calcium C. Chlorine О. Copper

6. Which of the following may be classified as a compound? A Crude oil B. Sodium C. Oxygen D. Water

7. Which substance is made up of two or more elements chemically combined? A. atom B. compound C. element D. substance

8. Which of the following in which elements and compounds are similar? Elements and compounds are both A. pure substances C. made up of different kinds of atom B listed on the periodic table D. can be broken down by physical changes

9. What do you call the substance that cannot be split into simpler form by chemical means? A compound B. element C. mixture D. molecule

10 Which of the following best describe water (H2O) and salt (NaCl)? A compound C. heterogeneous mixture B element D homogeneous mixture

11. Which is NOT an example of compound? A. Ammonia B. Helium gas C Hydrogen peroxide D. Table sugar​