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Chemistry Midterm – REVIEW
1. The label on a popular brand of “one-a-day” vitamins says there are 15mg of zinc per tablet. How many
grams of zinc are in one tablet?
2. If an atom loses an electron, it becomes a(n)
3. What elements exist as diatomic molecules?
4. What is 1,230 in scientific notation?
5. A salt solution has a concentration of 0.04%, what is the ppm?
6. How many moles are there in 58g of Copper (II) Chloride?
7. Calculate the percent composition of Potassium Sulfate.
8. If 50.0 g of Calcium nitrite is dissolved in 450g of water, what is the concentration?
9. Which answer indicates the correct coefficients to balance the following reaction:
Al2(SO4)3 + Ca(OH)2 -> Al(OH)3 + CaSO4
10. Which answer indicates the correct coefficients to balance the following reaction:
C10H8 + O2 -> CO2 + H2O
11. A solution has a pH of 5.8, what is its pOH?
12. If 15.2 g of Hydrochloric acid are dissolved in 150g of water, what is the concentration?
13. 28.9 m/s is how many mph?
14. In a chemical reaction, how is the mass of the products is related to the mass of the reactants?
15. What is the formula for Ammonium nitrate?
16. What is the name of Sn(OH)4?
17. What is the name of CsI?
18. What is the name of H2SO3?
19. When an acid is combined with a base the reaction always yields:
20. What is a heterogeneous mixture?
21. The first letter in a properly written chemical symbol always is ____.
22. What do chemical symbols and formulas represent, in that order?
23. The diameter of a carbon atom is 0.000 000 000 154 m. What is this number expressed in scientific
notation?
24. What is the electron configuration of potassium?
25. What is the charge of a cation?
26. How many valence electrons are in a silicon atom?
27. How many hydrogen atoms are in 5 molecules of isopropyl alcohol (C H O)?
28. What is the molar mass of AuCl3?
29. All the atoms of the same element have the same:
30. A scientific theory is a ____.
31. Which step in the scientific method requires you to use your senses to obtain information?
32. What is the volume of the wood block?
33. An object has a volume of 43mL and a density of 1.07 g/cm3. What is its mass?
34. A hypothesis is:
35. If you are doing an experiment to determine if the temperature in the classroom affected students’ test
scores, then your dependent variable would be:
36. What is the formula for aluminum oxide?
37. What is the name for this molecular compound: CCl4
38. What is the formula for calcium carbonate?
39. How many grams of NaCl are needed to prepare 0.50 L of a 1.7M solution in water?
40. How many significant digits does the number 0.023050 have?
41. A queen had a crown that she calculated to have a density of 12.6 g/mL. Knowing that actual gold has
a density of 19.6 g/mL, calculate the percent error.
42. True or False: A series of measurements could be precise but inaccurate.
43. The modern periodic table is arranged in order of increasing:
44. A student measures a volume as 25 mL, but the correct volume is 23 mL. What is a potential source of
error?
45. How many kg are in 328g?
46. What is the correct formula for acetic acid?
47. Which of the safety items must students know the location of and gather for personal protective
equipment before doing a lab?
48. Students are using heat, chemicals and glassware in a laboratory experiment. What is the best method of
eye protection?
49. If 40.0 g of NaOH is dissolved in 200.g of water, what is the concentration?
50. A student spills a chemical in the laboratory. What should he do first?
51. A sour candy has a pH of:
52. A characteristic that can be observed or measured without changing the sample’s composition is
53. An experiment that determines the maximum number of grams of a substance that will dissolve in 100
grams of water measures:
54. Counting the number of cookies on a plate is what type of observation?
55. A solution of solids is a(n)___________.
56. The electron configuration of calcium metal:
57. Which atoms would you expect to have the largest atomic radius?
58. Ionic bonds occur when the valence electrons are:
59. When covalent compounds share electrons equally it is called
60. Which answer indicates the correct coefficients to balance the following reaction:
Fe2O3 + CO -> Fe3O4 + CO2
61. What kind of chemical reaction is the following?: 3CuCl2 + 2Al 3 Cu + 2AlCl3
62. Which particles in atoms have a negative charge?
63. How many moles are there in 22g of CO2?
64. Calculate the percent composition of propane (C3H8).
65. All elements in the second family group have ________ valence electrons.
66. Which element is in family group 4a, period 5?
67. MSDS stands for