Exam 1 key - Answer Key: 1.-10 These are the questions in...

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Answer Key: 1.-10 These are the questions in the practice questions I sent you! A= ture, B=False 1. Matter is anything that has mass and occupies space? True False A 2. When applying the scientific method, it is important to avoid any form of hypothesis. True False B 3. Boiling point and melting point are extensive properties? True False B 4. The juice from an orange is a mixture? True False A 5. The number 6.0448, rounded to 3 decimal places, becomes 6.045. True False A 6. One mole of oxygen gas has a mass of 16.0 g True False B 7. One mole of methane (CH 4 ) contains a total of 3 × 10 24 atoms. True False A 8. In a correctly balanced equation, the number of reactant molecules must equal the number of product molecules. True False B (atoms should be conserved, not molecules) 9. The limiting reactant is the reactant with the smallest initial mass. True False B (to be first consumed completely) 10. The percent yield can be determined by dividing the actual yield by the theoretical yield and multiplying this value by 100. True False A
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11. What is a unifying principle that explains a body of experimental observations? A. law B. hypothesis C. theory D. phenomena E. prediction C 12. Which of the following cannot be separated into a simpler substance by chemical means? A. element B. emulsion C. compound D. homogeneous mixture E. heterogeneous mixture A 13. The SI prefixes milli and mega represent, respectively: A. 10 6 and 10 -6 B. 10 – 3 and 10 6 C. 10 3 and 10 – 6 D. 10 – 3 and 10 9 E. 10 – 6 and 10 – 3 B 14. The distance between carbon atoms in ethylene is 134 picometers. Which of the following expresses that distance in meters? A. 1.34 × 10 -13 m B. 1.34 × 10 -12 m C. 1.34 × 10 -10 m D. 1.34 × 10 -7 m E. 1.34 × 10 -6 m C, 134 x 10 -12 15. The mass of a sample is 550 milligrams. Which of the following expresses that mass in kilograms? A. 5.5 × 10 8 kg B. 5.5 × 10 5 kg C. 5.5 × 10 -4 kg D. 5.5 × 10 -6 kg E. 5.5 × 10 -1 kg C 16. What is the volume in milliliters of a 32.0 oz can of juice? (1 fl oz = 29.6 mL) A. 1.08 mL B. 947 mL C. 0.925 mL D. 0.95 mL E. 1.1 mL B
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17. If you have a graduated cylinder containing 15.5 mL and this volume changes to 95.2 mL after a metal with a mass of 795g is dropped into the graduated cylinder then what is the density of this metal? A. 8.35 g/mL B. 51.3 g/mL C. 7.18 g/mL D. 9.97 g/mL E. 1.00 g/mL D 18. How many mm 3 are in 16.7cm 3 ? A. 1.67 x 10 -5 mm 3 B. 1.67 x 10 -8 mm 3 C. 1.67 x 10 7 mm 3 D. 1.67 x 10 4 mm 3 E. 1.67 x 10 -4 mm 3 D 19. The speed needed to escape the pull of Earth ' s gravity is 11.3 km/s. What is this speed in mi/h? (1 mile = 1609 m, 1 h = 3600 s) A. 65,500 mi/h B. 25,300 mi/h C. 18,200 mi/h D. 1,090 mi/h E. 5.02 × 10 -3 mi/h B 20. The result of (3.8621 × 1.5630) - 5.98 is properly written as
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Exam 1 key - Answer Key: 1.-10 These are the questions in...

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