18. Does your experimental formula agree with the expected formula? Explain your answer. 19. In terms of the chemistry and energy of the reaction, explain your observations in \#7 above. 20. Explain why some zinc was lef over at the end of the reaction and why you think the amounts were selected to have zinc left over. 21. (optional) What did you observe in the electrolysis reaction? 22. (optional) Were your observations on the electrolysis consistent with your expectations? Explain your answer. A. Synthesis and formula of zinc iodide. 1. Write the expected balanced equation for the reaction between zinc and iodine 2. Mass of beaker 3. Mass of evaporating dish 4. Mass of iodine 5. Mass of zinc 6. Mass of zinc + iodine 7. Observations after addition of water containing acetic acid 8. Mass of beaker + residual zinc 9. Mass of residual zinc 10. Mass of zinc consumed in reaction 11. Mass of evap. dish + zinc iodide 12. Mass of zinc iodide 13. a. Mass of zinc iodide + residual zinc b. Was mass conserved within experimental error in this reaction? Explain your answer. 14. Moles of zinc consumed in reaction 15. Moles of iodine consumed in reaction 16. Mole ratio of iodine to zinc (use appropriate number of significant figsures) 17 Finmula of rine innlists 36. The metric unit used to measure volume is the A) gram. B) gram per cubic centimeter. C) Kelvin. D) liter. E) meter. 37. The units most likely to be used to measure the amount of alcohol to be added to a small test tube are A) g. B) mL. C) cm. D) kg. E) L. 38. In an introductory laboratory exercise, a student was asked to measure the volume of soda in a partially filled can in metric units. Which value below is most likely to be correct? A) 1.0kL B) 2.5L C) 325mL D) 550L E) 6.0106nL 39. Which value is closest to the amount of gasoline in a small car with a full tank (which contains about 13 gallons)? A) 450mL B) 50L C) 85L D) 12kL E) 3.5102dL 40. Which of the following measurements has three significant figures? A) 1,207g B) 4.250g C) 0.006g D) 0.0250g E) 0.03750g 41. What is the numerical value of 1.21.222 ? Express your answer using the correct number of significant figures. A) 1.5 B) 1.47 C) 1.466 D) 1.4664 E) none of the above 42. A laboratory technician reports that the mass of a growth removed from a patient is 274.06g. How many significant figures does this measurement contain? A) 2 B) 3 C) 4 D) 5 E) none of the above 43. In which of the following numbers are all of the zeros not significant? A) 3300 B) 0.0450 C) 45.060 D) 607.80 44. What is the total length of two pieces of tubing which measure 4.5cm and 3.222cm ? Express the answer to the correct number of significant figures. A) 3.722cm B) 4.722cm C) 7.722cm D) 7.7cm E) 8cm 45. What is the area of a piece of metal foil that measures 43.9cm by 29.21cm ? Express the answer to the correct number of significant figures. A) 128cm2 B) 1280cm2 C) 1282.3cm2 D) 1282.32cm2 E) 1282.319cm2 46. The numerical value for (5.6104)(7.89102) is equal to, with the proper number of significant figures: A) 70.976 d. conducts electricity Element Z can be classified as a and will be found the zigzag line of the periodic table. A) metal; along side of B) metalloid; along side of C) non-metal; to the right of D) non-metal; along side of E) metal; to the left of 28. Consider the chemical reaction described as mercury(II) oxide heat mercury + oxygen. Identify the reactant(s) in this example. A) heat B) mercury + oxygen C) mercury(II) oxide D) mercury E) oxygen 29. A chemical reaction occurs when A) a substance's structure is altered. B) a substance is heated. C) two or more substances are mixed. D) a substance is dissolved in water. E) all of the above 30. When the prefix centi is used in the metric system, a fundamental unit of measurement is multiplied by what factor? A) 103 B) 102 C) 106 D) 103 E) 106 31. How long is 1cm ? A) 0.01mm B) 1mm C) 10mm D) 100mm 32. The abbreviation for the metric unit used to measure mass is A) g B) g/cm3 C) K D) L E) m 33. Which value is closest to the mass of a 2 -pound box of laundry detergent? A) 200g B) 2.0104cg C) 9109mg D) 1kg E) 4.5103ng 34. Which measurement represents the largest quantity? A) 4730ng B) 4.73104g C) 4.73103g D) 4.73106kg E) 47.3mg 35. Which measurement represents the smallest quantity? A) 2950ng B) 2.95104g C) 2.95103g D) 2.95106kg E) 29.5mg 36. The metric unit used to measure volume is the A) gram. B) gram per cubic centimeter. C) Kelvin. D) liter