Chemistry Test: Unit 1 Review Multiple Choice: Identify the letter of the choice that best completes the statement or answers the question. Bubble your answer on the blue side of your answer sheet. 1. Which step in the scientific method requires you to use your senses to obtain information? a. revising a hypothesis c. making an observation b. designing an experiment d. stating a theory 2. The diameter of a carbon atom is 0.000 000 000 154 m. What is this number expressed in scientific notation? a. 1.54 10 m c. 1.54 10 m b. 1.54 10 m d. 1.54 10 m 3. What is the result of multiplying 2.5 a. 8.8 10 b. 8.8 10 4. What is the result of multiplying 2.120 a. 8.48 105 b. 8.5 105 c. 8.48 103 10 by 3.5 10 ? c. 8.8 10 d. 8.8 10 10 and 4 10 ? d. 8.480 105 e. 8 105 5. Which of the following measurements contains two significant figures? a. 0.004 00 L c. 0.000 44 L b. 0.004 04 L d. 0.004 40 L 6. Which of the following measurements is expressed to three significant figures? a. 0.007 m c. 7.30 10 km b. 7077 mg d. 0.070 mm 7. In the measurement 0.503 L, which digit is the estimated digit? a. 5 b. the 0 immediately to the left of the 3 c. 3 d. the 0 to the left of the decimal point 8. Express the sum of 1111 km and 222 km using the correct number of significant digits. a. 1300 km c. 1333 km b. 1330 km d. 1333.0 km 9. What quantity is represented by the metric system prefix deci-? a. 1000 c. 0.1 b. 100 d. 0.01 10. The chief advantage of the metric system over other systems of measurement is that it ____. a. has more units c. is in French b. is in multiples of 10 d. is derived from nature itself 11. Which of the following volumes is the smallest? a. one microliter c. one milliliter b. one liter d. one deciliter 12. What is the SI unit of mass? a. liter b. joule c. candela d. kilogram 13. Which of the following mass units is the largest? a. 1 cg c. 1 mg b. 1 dg d. 1 ng 14. The weight of an object ____. a. is the same as its mass b. depends on its location c. is not affected by gravity d. is always the same 15. What is the quantity 0.0075 meters expressed in centimeters? a. 0.075 cm c. 7.5 cm b. 0.75 cm d. 70.5 cm 16. What is the quantity 987 milligrams expressed in grams? a. 0.000 987 g c. 9.87 g b. 0.987 g d. 98,700 g 17. Which of the following equalities is NOT correct? a. 100 cg = 1 g c. 1 cm = 1 mL b. 1000 mm = 1 m d. 10 kg = 1 g 18. A cubic meter is about the same as the volume occupied by a ____. a. kilogram of water c. washing machine b. cup of milk d. basketball arena 19. The metric unit for length that is closest to the thickness of a dime is the a. micrometer c. centimeter b. millimeter d. decimeter 20. 6.7 g is equal to a. 6700 ng b. 67 ng c. 6700 pg d. 0.0067 pg 21. The product of 13 cm and 5.7 cm is correctly reported as a. 74 cm2 c. 74.0 cm2 b. 74.1 cm2 d. 75 cm2 22. One characteristic of a scientific theory is that ____. a. it can never be proved c. it cannot be modified b. it can be proved d. it summarizes a set of observations 23. A theory is a ____. a. proposed explanation for an observation b. well-tested explanation for a broad set of observations c. summary of the results of many observations d. procedure used to test a proposed explanation 24. The variable that is observed during an experiment is called what type of variable? a. independent c. controlling b. manipulated d. dependent Short Answer 25. A boy is trying to move a desk into his bedroom. The bedroom doorway is 0.97 m wide. The desktop measures 154 cm x 86 cm. Is the desk narrow enough to fit through the doorway? Explain your answer. 26. What is independent variable? 27. What is a control in an experiment? 28. What is constant? 29. What is the most important thing you will learn in this class ie. The Point? (in Pressly’s opinion) Essay 30. Explain how a hypothesis, a theory, and a scientific law are related to observations. Chemistry Test: Unit 1 Review Answer Section MULTIPLE CHOICE 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: C D C E C C C C C B A D B B B B D C B A A A B D DIF: DIF: DIF: DIF: DIF: DIF: DIF: DIF: DIF: DIF: DIF: DIF: DIF: DIF: DIF: DIF: DIF: DIF: DIF: L1 DIF: L1 DIF: L2 SHORT ANSWER 25. ANS: yes 26. ANS: changed by experimentor 27. ANS: comparison 28. ANS: stays same 29. ANS: think ESSAY L2 L1 L2 L2 L1 L2 L1 L1 L1 L1 L1 L1 L2 L2 L1 L1 L2 L2 REF: REF: REF: REF: REF: REF: REF: REF: REF: REF: REF: REF: REF: REF: REF: REF: REF: REF: p. 22 p. 63 p. 63, p. 71 p. 63, p. 71 p. 66 p. 66 p. 66 p. 68 p. 74 p. 73 p. 74, p. 75 p. 76 p. 74, p. 76 p. 76 p. 84 p. 84 p. 84 p. 84 REF: p. 23 REF: p. 23 REF: p. 22 OBJ: OBJ: OBJ: OBJ: OBJ: OBJ: OBJ: OBJ: OBJ: OBJ: OBJ: OBJ: OBJ: OBJ: OBJ: OBJ: OBJ: OBJ: 1.3.2 3.1.1 3.1.1 3.1.1 3.1.2 3.1.2 3.1.3 3.1.3 3.2.1 3.2.1 3.2.1 3.2.1 3.2.1 3.2.2 3.3.2 3.3.2 3.3.2 3.3.3 OBJ: 1.3.2 OBJ: 1.3.2 OBJ: 1.3.2 30. ANS: A hypothesis is a proposed explanation for one or more observations. If a hypothesis addresses a broad range of observations, and if it has been tested by repeated experiments, it may be raised to the level of a theory. The same set of observations can lead to both a scientific law and a theory. A scientific law is a concise summary of the observations. A theory provides the explanation. DIF: L3 REF: p. 22, p. 23 OBJ: 1.3.2
