Answer Key of Worksheet No.2 Identify the letter of the choice that best completes the statement or answers the question. Part I: Multiple Choices 1. (Physical or Chemical) properties of a substance can be observed. a. physical 2. One can use their five senses to determine the (Physical or Chemical) properties of a substance. a. physical 3. ( Physical or/and Chemical ) properties usually describe how a substance reacts. b. chemical 4. ( Physical or/and Chemical ) properties are not as easy to observe. b. chemical 5. ( Physical or/and Chemical ) properties can be used to identify substances. a. physical and chemical Part II: Matching a. physical b. chemical __a___ 1. Oxygen is odorless and colorless. __b___ 2. Copper turns green when exposed to the environment. ___a__ 3. The piece of metal is magnetic. ___a__ 4. The density of water is 1.0 gram per cubic centimeter. ___a__ 5. Diamonds are a very hard substance. ___a__ 6. The tree is 8 meters high. ___b__ 7. Sodium reacts very easily with other elements. ___a__ 8. Copper conducts electricity. __a__ 9. Water is a liquid. ___a__ 10. The mass of the NaCl sample is 30 grams. ___b__ 11. Gold is nonflammable. ___b__ 12. Alka-Seltzer tablets react with water to produce gas. ___a__ 13. The color of the ball is red. ___b__ 14. Iron reacts with oxygen and forms rust. ___a__ 15. The boiling point of water is 100 degrees C. ___b__ 16. Baking soda reacts with vinegar. ___b__ 17. The gas is flammable. ___b__ 18. The silver spoons tarnished and turned dark. ___a__ 19. Diamonds are a shiny. ___b__ 20. Argon is not very reactive.