ࡱ> xzwM $bjbj== %WW$l<F F F F < <1 $ -     z   -\oS< F   01   J6Chemistry 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 hypothesisc.making an observationb.designing an experimentd.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 mc.1.54  10 mb.1.54  10 md.1.54  10 m 3. What is the result of multiplying 2.5  10 by 3.5  10? a.8.8  10c.8.8  10b.8.8  10d.8.8  10 4. What is the result of multiplying 2.120  10 and 4  10? a.8.48  105d.8.480  105b.8.5  105e.8  105c.8.48  103 5. Which of the following measurements contains two significant figures? a.0.004 00 Lc.0.000 44 Lb.0.004 04 Ld.0.004 40 L 6. Which of the following measurements is expressed to three significant figures? a.0.007 mc.7.30  10 kmb.7077 mgd.0.070 mm 7. In the measurement 0.503 L, which digit is the estimated digit? a.5b.the 0 immediately to the left of the 3c.3d.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 kmc.1333 kmb.1330 kmd.1333.0 km 9. What quantity is represented by the metric system prefix deci-? a.1000c.0.1b.100d.0.01 10. The chief advantage of the metric system over other systems of measurement is that it ____. a.has more unitsc.is in Frenchb.is in multiples of 10d.is derived from nature itself 11. Which of the following volumes is the smallest? a.one microliterc.one milliliterb.one literd.one deciliter 12. What is the SI unit of mass? a.literc.candelab.jouled.kilogram 13. Which of the following mass units is the largest? a.1 cgc.1 mgb.1 dgd.1 ng 14. The weight of an object ____. a.is the same as its massc.is not affected by gravityb.depends on its locationd.is always the same 15. What is the quantity 0.0075 meters expressed in centimeters? a.0.075 cmc.7.5 cmb.0.75 cmd.70.5 cm 16. What is the quantity 987 milligrams expressed in grams? a.0.000 987 gc.9.87 gb.0.987 gd.98,700 g 17. Which of the following equalities is NOT correct? a.100 cg = 1 gc.1 cm = 1 mLb.1000 mm = 1 md.10 kg = 1 g 18. A cubic meter is about the same as the volume occupied by a ____. a.kilogram of waterc.washing machineb.cup of milkd.basketball arena 19. The metric unit for length that is closest to the thickness of a dime is the a.micrometerc.centimeterb.millimeterd.decimeter 20. 6.7 mg is equal to a.6700 ngc.6700 pgb.67 ngd.0.0067 pg 21. The product of 13 cm and 5.7 cm is correctly reported as a.74 cm2c.74.0 cm2b.74.1 cm2d.75 cm2 22. One characteristic of a scientific theory is that ____. a.it can never be provedc.it cannot be modifiedb.it can be provedd.it summarizes a set of observations 23. A theory is a ____. a.proposed explanation for an observationb.well-tested explanation for a broad set of observationsc.summary of the results of many observationsd.procedure used to test a proposed explanation 24. The variable that is observed during an experiment is called what type of variable? a.independentc.controllingb.manipulatedd.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 Presslys 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. ANS: C DIF: L2 REF: p. 22 OBJ: 1.3.2 2. ANS: D DIF: L1 REF: p. 63 OBJ: 3.1.1 3. ANS: C DIF: L2 REF: p. 63, p. 71 OBJ: 3.1.1 4. ANS: E DIF: L2 REF: p. 63, p. 71 OBJ: 3.1.1 5. ANS: C DIF: L1 REF: p. 66 OBJ: 3.1.2 6. ANS: C DIF: L2 REF: p. 66 OBJ: 3.1.2 7. ANS: C DIF: L1 REF: p. 66 OBJ: 3.1.3 8. ANS: C DIF: L1 REF: p. 68 OBJ: 3.1.3 9. ANS: C DIF: L1 REF: p. 74 OBJ: 3.2.1 10. ANS: B DIF: L1 REF: p. 73 OBJ: 3.2.1 11. ANS: A DIF: L1 REF: p. 74, p. 75 OBJ: 3.2.1 12. ANS: D DIF: L1 REF: p. 76 OBJ: 3.2.1 13. ANS: B DIF: L2 REF: p. 74, p. 76 OBJ: 3.2.1 14. ANS: B DIF: L2 REF: p. 76 OBJ: 3.2.2 15. ANS: B DIF: L1 REF: p. 84 OBJ: 3.3.2 16. ANS: B DIF: L1 REF: p. 84 OBJ: 3.3.2 17. ANS: D DIF: L2 REF: p. 84 OBJ: 3.3.2 18. ANS: C DIF: L2 REF: p. 84 OBJ: 3.3.3 19. ANS: B 20. ANS: A 21. ANS: A 22. ANS: A DIF: L1 REF: p. 23 OBJ: 1.3.2 23. ANS: B DIF: L1 REF: p. 23 OBJ: 1.3.2 24. ANS: D DIF: L2 REF: p. 22 OBJ: 1.3.2 SHORT ANSWER 25. ANS: yes 26. ANS: changed by experimentor 27. ANS: comparison 28. ANS: stays same 29. ANS: think ESSAY 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. 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