CHEMCOM PRACTICE FINAL EXAM
CHEMISTRY PRACTICE FINAL EXAM Name_________________
1. In the periodic table, the most active metals are found
(a) at the far left side (c) directly to the left of the step-like line
(b) at the far right side (d) directly to the right of the step-like line
2. Which of these elements is most chemically similar to silicon?
(a) O (b) C (c) P (d) A1
3. On the periodic table, the halogens are found in
(a) Group 13 (b) Group 17 (c) Period 3 (d) Period 4
4. Which of these elements is a metalloid?
(a) As (b) Be (c) Ca (d) K
5. Which of these is a chemical property?
(a) resistance to corrosion (c) boiling point
(b) malleability (d) solubility in water
6. Which of these observations is evidence of a chemical change?
(a) a drink mix dissolves in water (c) rubbing alcohol evaporates from a surface
(b) bubbles of a gas explode when ignited (d) a pop can is crushed by a hammer
7. Which symbol represents a nonmetal?
(a) Br (b) K (c) W (d) Hg
8. Which property is characteristic of a nonmetal?
(a) good conductor of heat (c) malleable
(b) brittle (d) high density
9. Which list has elements that are all in the same chemical family?
(a) Ca, Y, Ba (b) Cu, Ag, Au (c) Al, Ge, In (d) Br, Xe, At (e) Sn, Sb, Te
10. Which choice is not a chemical change?
(a) wood burns in a fireplace (c) mold “grows” on cheese
(b) a glass of milk becomes sour (d) sugar dissolves in water
11. The modern periodic table is arranged on what basic property?
(a) atomic number (b) atomic mass (c) density (d) phase
12. What is the coefficient of the CH4 when the following equation is balanced?
___Al4C3 + ___ H2O → ___ CH4 + ___ A1(OH)3
(a) 1 (b) 2 (c) 3 (d) 4
13. What is the molar mass of Zn(NO3)2?
(a) 159.41 g (b) 189.41 g (c) 173.41 g (d) 254.81 g
14. How many moles are present in a 16 gram sample of CaO?
(a) 0.285 mol (b) 0.500 mol (c) 2.00 mol (d) 32.0 ml
15. What is the mass of 2.0 mol of CuCl2?
(a) 49.0g (b) 67.2g (c) 198g (d) 269g
16. Which of the following statements about atomic number is false?
(a) It is the whole number used to numerically order the elements.
(b) It represents the number of protons.
(c) It is the relative amount of mass of the element.
(d) It equals the number of electrons when the element is a neutral atom.
17. Which statement is correct about an atom with 12 protons?
(a) it has a mass number of 12 (c) it has 10 electrons
(b) it has an atomic number of 12 (d) it must have 12 neutrons
18. What is the symbol of an atom with 8 protons and 9 neutrons in its nucleus?
(a) 17O (c) 17Cl
(b) 17F (d) not enough information
19. The nucleus of an atom of iron-56 has
(a) 26 protons and 26 neutrons and 30 electrons
(b) 26 protons and 30 neutrons and 26 electrons
(c) 30 protons and 26 neutrons and 26 electrons
(d) 30 protons and 30 neutrons and 30 electrons
20. Given the balanced equation: CuS → Cu + S
Determine the total number of grams of copper produced if 6.0 moles of CuS is completely
decomposed according to the equation.
(a) 63.5 grams (b) 174 grams (c) 381.6 grams (d) 573 grams
21. What is the total number of neutrons in an atom with a mass number of 80 that has 35 protons?
(a) 35 (b) 45 (c) 80 (d) 115
22. Given the incomplete balanced equation: 2 Mg(s) + ___(g) → 2 MgO(s)+ C(s)
Which formula represents the substance that will react with magnesium to give the products
shown?
(a) CH2O (b) CH4 (c) CaO (d) CO2
23. Which element is a semiconductor?
(a) boron (b) bromine (c) lithium (d) phosphorus
24. Horizontal rows of elements in the periodic table are called:
(a) families (b) triads (c) periods (d) octaves
25. Calculate the molar mass of the compound: C12H22O11
(a) 45g (b) 166g (c) 177g (d) 342g
26. Calculate the percent by mass of copper in the compound, Cu2O.
(a) 11% (b) 66% (c) 80% (d) 89%
27. How many atoms of oxygen are shown in the formula, Al2(SO4)3?
(a) 7 (b) 1 (c) 4 (d) 12
28. A substance that is a good conductor of heat, is hard, and malleable, is best classified as a
(a) nonmetal (b) halogen (c) metalloid (d) metal
29. What is the name of KBr?
(a) potassium monobromide (c) potassium bromide
(b) kassium bromine (d) dipotassium monobromide
30. Hydrocarbons are compounds that contain
(a) oxygen and carbon atoms (c) carbon, hydrogen, and nitrogen atoms
(b) hydrogen and carbon atoms (d) carbon, oxygen, and nitrogen atoms
31. What is the total number of joules absorbed by 10.0 grams of water if its temperature increases
from 16.0°C to 90.0°C? (Specific heat of water = 4.18j/g*°C)
(a) 3093 J (b) 41l80 J (c) 1040 J (d) 418 J
32. Which type of bonding involves the sharing of electrons between the valence shells of two atoms?
(a) ionic bonding (c) metallic bonding
(b) covalent bonding (d) hydrogen bonding
33. Which gas is a product of the combustion of propane?
(a) CO2 (b) NH3 (c) O2 (d) H2
34. A substance that is added to a chemical process to speed up the reaction, but is not used up during
the reaction is called a
(a) reactant (b) cracker (c) isomer (d) catalyst
35. Given the balanced equation for a reaction: C + O2 → CO2 + 394 kJ
(a) the reaction is endothermic
(b) the reaction is exothermic
(c) the reaction is neither endothermic nor exothermic
(d) not enough information to tell if the reaction is endothermic or exothermic
36. All of the following properties are physical properties of a substance except
(a) boiling point (b) hardness (c) malleability (d) combustibility
37. All atoms of the same element have the same
(a) atomic number (b) electron number (c) ion number (d) neutron number
38. The dissolved substance is a solution is the
(a) solvent (b) solute (c) precipitate (d) filtrate
39. What two measurements of a substance make up the substance’s density value?
(a) mass and weight (c) mass and volume
(b) volume and pressure (d) temperature and mass
40. Given the balanced equation: FeO + CO → Fe + CO2
The reactants in the equation are
(a) FeO and CO (c) Fe and CO2
(b) FeO and CO2 (d) Fe and CO
41. Atoms, which have become ions, have lost or gained
(a) electrons (b) protons (c) neutrons (d) nucleons
42. Generally, for solids dissolving in liquids, how does an increase in temperature affect the
solubility of a solid?
(a) decreases solubility (c) does not affect solubility
(b) increases solubility (d) it increases, then decreases
Use the following to answer questions 43 thru 45
[pic]
43. What is the mass of KCl needed to make a saturated solution in 100g of water at 33°C?
(A) 38 g (b) 43g (c) 50 g (d) 72g (e) 82g
44. At what temperature will 80g of KNO3 dissolve in 100 grams of water to produce a saturated
solution?
(a) 27°C (b) 65°C (c) 165°C (d) 50°C
45. Which substance has the lowest solubility at 0°C?
(a) KNO3 (b) KC1 (c) NaC1 (d) All of the above
46. Which substance is an example of a compound?
(a) CO(g) (b) Ni(s) (c) Na(s) (d) Ne(g)
47. Compared to the density of ice, liquid water has
(a) a lower density (c) the same density
(b) a higher density (d) impossible to tell
48. Vinegar contains a water solution of acetic acid. The most likely pH of vinegar is
(a) -1 (b) 7 (c) 3 (d) 13
49. Which symbol does not represent an ion?
(a) Na (b) Ca+ (c) C1- (d) H+
50. Which statement correctly describes the type and number of atoms represented by the formula,
Ca(OH)2?
(a) 1 calcium, 1 oxygen, 2 hydrogen (c) 2 calciums, 2 oxygens, 2 hydrogens
(b) 1 calcium, 2 oxygens, 2 hydrogens (d) 1 calcium, 1 oxygen, 1 hydrogen
51. Which of these is an element?
(a) air (b) ammonia (c) nitrogen (d) water
52. When an atom of magnesium becomes an ion of magnesium (Mg2+), the atom must
(a) lose two electrons (c) gain one neutron
(b) lose two protons (d) gain one electron
53. Which formula is correct for the ionic compound formed from combining magnesium ions and
chloride ions?
(a) MgC1 (b) MgC12 (c) Mg2C1 (d) Mg2C12
54. Which pH value indicates a basic solution?
(a) 2 (b) 5 (c) 7 (d) 10
55. How many protons are in the nucleus of an atom of sodium?
(a) 11 (b) 12 (c) 23 (d) 32
56. Which subatomic particle is lost or gained when an atom becomes an ion?
(a) electron (b) neutron (c) proton (d) nucleon
57. Which material is best classified as a compound?
(a) water (b) oxygen (c) air (d) neon
58. Which material is best classified as a mixture?
(a) carbon dioxide (b) seawater (c) hydrogen (d) calcium chloride
59. Which substance will produce a solution with a basic pH when dissolved in water?
(a) HC1 (b) sugar (c) CO2 (d) NaOH
60. What is the number of electrons in a calcium ion, Ca2+?
(a) 18 (b) 20 (c) 40 (d) 42
61. Standard atmospheric pressure can be expressed as
(a) 100 mm Hg (c) 760 mm Hg
(b) 100 atmospheres (d) 760 atmospheres
62. What causes pressure inside a tire?
(a) gas molecules colliding with each other (c) the diffusion of the gases
(b) gas molecules colliding with the wall of the tire (d) constant changing of temperature
63. If oxygen gas occupies 251 mL at 729 mm Hg, at what volume will its pressure be 753 mm Hg?
Assume the temperature is constant.
(a) 219 mL (b) 243 mL (c) 257 mL (d) 269 mL
64. To convert a temperature in Celsius to Kelvin, which is the correct operation?
(a) add 273 (b) subtract 273 (c) multiply by 273 (d) divide by 273
65. If the Kelvin temperature of a gas sample in a rigid tank doubles, the pressure exerted by the gas
is
(a) twice the original (c) four times the original
(b) half the original (d) the square root of the original
66. A 23.8-mL sample of a gas at 295 K and 700.0 mm Hg is changed to STP. What is the new
volume?
(a) 20.3 mL (b) 23.7 mL (c) 23.9 mL (d) 25.6 mL
67. What volume would 3.00 moles of helium gas occupy at STP?
(a) 7.47 L (b) 22.4 L (c) 67.2 L (d) 72.6 L
68. Given the balanced equation for a reaction at STP:
4 HBr(g) + O2(g) → 2 H2O(g) + 2 Br2(g)
How many liters of hydrogen bromide would react with 200 liters of oxygen?
(a) 100 L (b) 200 L (c) 400 L (d) 800 L
69. How many moles of HC1 would be found in 2.0 liters of a 6.0-M solution of the acid?
(a) 3 mol (b) 6 mol (c) 8 mol (d) 12 mol
70. Given the following reaction for burning gasoline:
2 C8H18 (g) + 25 O2 (g) → 16 CO2 (g) + 18 H2O (g)
How many moles of O2 are necessary to react with 5 moles of C8H18?
(a) 25.0 moles (b) 62.5 moles (c) 0.40 moles (d) 10.0 moles
71. Determine the pressure exerted by 0.25 mole neon gas in a 2.75 L container at 35ºC.
(a) 2.30 atm (b) 6.32 atm (c) 0.44 atm (d) 0.26 atm
72. A measurement of 35 milligrams is equal to ? centigrams?
(a) 0.35 cg (b) 3.5 cg (c) 350 cg (d) 0.035 cg
73. If an object has a density of 0.86 g/mL and a mass of 15 g, it’s volume is
(a) 17.4 mL (b) 12.9 mL (c) 0.057 mL (d) 129 mL
74. As you go down a group in the Periodic Table, electronegativity
(a) increases (c) decreases
(b) increases then decreases (d) decreases then increases
75. Chlorine will form a covalent bond with
(a) carbon (b) barium (c) sodium (d) magnesium
76. A 0.0034 M solution of HNO3 has a pH of
(a) 2.46 (b) 11.54 (c) 0.0034 (d) -2.46
77. How many total atoms are in the following compound? Fe2(SO4)3
(a) 15 (b) 14 (c) 21 (d) 17
78. Which of the following is an Erlenmeyer flask?
(a)[pic] (b) [pic] (c) [pic] (d) [pic]
79. Which of the following has the same value as 0.00645?
(a) 6.45 × 103 (c) 64.6 × 10-4
(b) 6.45 × 10-3 (d) 64.6 × 104
80. How many protons are in Carbon 12, 13, and 14?
(a) 12, 13, and 14 respectively (c) 6, 7, and 8 respectively
(b) always 6 (d) Cannot be Predicted
81. A cube has a mass of 21.6g. It is placed in 10.0 mL of water, and the water level rises to 18.0 mL. What will happen when you place this cube in water?
(a) It will sink. (b) It will float. (c) Cannot Predict
82. Which of the following is an acid?
a. H2O b. NaOH c. HCl d. CH4
83. Which of the following is a heterogeneous mixture?
(a) Air (b) Salt Water (c) Ocean Water (d) Bronze
84. Which of the following is a pure substance?
(a) air (b) stainless steel (c) argon (d) bread
85. The number of protons in Al+3 is
(a) 10 (b) 13 (c) 7
86. Which of the following is the correct Bohr model for Si?
(a) )2e- )4e- )8e- (c) )8e- )6e-
(b) )8e- )2e- )4e- (d) )2e- )8e- )4e-
87. What is a correct Lewis Dot Structure for Oxygen?
a. O b. O c. Either A or B
88. Which of the following is true:
a) the mass of an electron is negligible (c) atoms are mostly empty space
(b) Isotopes have the same number of protons (d) all of these
-----------------------
14 p
14 p
14 p
14 p
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