Download Chemistry Spring Final Review

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Chemistry Spring Final Review
1. What is the percent by mass of hydrogen in NH3 ?
A. 5.9%
B. 17.6%
C. 21.4%
2. The percent by mass of nitrogen in Mg(CN) 2 is equal to
14
14
28
A.
× 100
B.
× 100
C.
× 100
76
50
76
3. What is the percent by mass of oxygen in Fe 2 O 3 ?
A. 16%
B. 30%
C. 56%
D. 82.4%
D.
28
50
× 100
D. 70%
4. What is the correct name of the compound with the formula NH4 NO 2 ?
A. Ammonia nitrite
C. Ammonia nitrate
B. Ammonium nitrite
D. Ammonium nitrate
5. Which formula correctly represents iron (III) oxide?
A. Fe 2 O 3
B. Fe 3 O 2
C. FeO 3
D. Fe 3 O
6. What is the name of the compound whose formula is H2 SO 4 ?
A. Hydrosulfuric acid
C. Sulfuric acid
B. Hydrosulfurous acid
D. Sulfurous acid
7. What is the correct name for the compound with the formula CrPO 4 ?
A. Chromium (II) phosphate
C. Chromium (III) phosphate
B. Chromium (II) phosphide
D. Chromium (III) phosphide
8. What is the molar mass of a compound if 5 moles of the compound has a mass of 100 grams?
A. 5 g/mol
B. 20 g/mol
C. 100 g/mol
D. 500 g/mol
9. Which quantity is equivalent to 39 grams of LiF?
A. 1.0 mole
B. 2.0 moles
C. 0.50 mole
D. 1.5 moles
10. What is the mass in grams of 1.00 mole of O 2 gas?
A. 11.2
B. 16.0
C. 22.4
D. 32.0
11. The molar mass of Ca 3 (PO 4 ) 2 is
A. 246 g/mol
B. 279 g/mol
D. 342 g/mol
C. 310 g/mol
12. What is the total number of moles contained in 115 grams of C 2 H5 OH?
A. 1.00
B. 1.50
C. 3.00
D. 2.50
13. What is the total mass in grams of 0.75 mole of SO 2 ?
A. 16 g
B. 24 g
C. 32 g
14. Which substance has the greatest molecular mass?
A. H2 O 2
B. NO
C. CF4
D. 48 g
D. I 2
15. Given the reaction: __Ca + __H2 O  __Ca(OH) 2 + __H2 , how many moles of H2 O are needed to
react with 2.0 moles of Ca?
A. 1.0
B. 2.0
C. 0.50
D. 4.0
16. In the reaction __N 2 + __H2  __NH3 , how many grams of H2 are needed to produce exactly 1
mole of ammonia?
A. 1 g
B. 2 g
C. 3 g
D. 4 g
17. Given the reaction: __Cu + __HNO 3  __Cu(NO 3 ) 2 + __NO + __H2 O, the total number of
grams of Cu needed to produce 1.0 mole of Cu(NO 3 ) 2 is
A. 32
B. 64
C. 128
D. 192
18. Given the reaction: __Mg + __HCl  __MgCl 2 + __H2 , what is the total number of grams of Mg
consumed when 0.50 mole of H2 is produced?
A. 6.0 g
B. 12 g
C. 3.0 g
D. 24 g
19. What is the correct coefficient for carbon monoxide in the reaction Fe 2 O 3 + CO  Fe + CO 2 ?
A. 6
B. 3
C. 5
D. 1
20. Which chemical equation is correctly balanced?
A. H2 (g) + O 2 (g)  H2 O(g)
C. 2NaCl(s)  Na(s) + Cl 2 (g)
B. N 2 (g) + H2 (g)  NH 3 (g)
D. 2KCl(s)  2K(s) + Cl 2 (g)
21. In which compound is the percent composition by mass of chlorine equal to 47%?
A. HClO
B. HClO 2
C. HClO 3
D. HClO 4
22. What is the percent composition by mass of sulfur in the compound MgSO 4 ?
A. 20%
B. 27%
C. 46%
D. 53%
23. Which of the following best describes exothermic chemical reactions?
A. They never release heat.
C. They never occur spontaneously.
B. They always release heat.
D. They always occur spontaneously.
24. When NH4 NO 3 is dissolved in water, the temperature of the water decreases. When NaOH is
dissolved in a separate water sample, the temperature of the water increases. Based on these
observations, it can be concluded that the dissolving of
A. Both salts is endothermic.
B. Both salts is exothermic.
C. NH4 NO 3 is endothermic and the dissolving of NaOH is exothermic.
D. NH4 NO 3 is exothermic and the dissolving of NaOH is endothermic.
25. Which change of phase is endothermic?
A. CO 2 (g)  CO 2 (s)
B. H2 O(l)  H2 O(s)
C. I 2 (s)  I 2 (g)
D. H2 O(g)  H2 O(l)
26. Assume that potential energy of the products in a chemical reaction is 60 kilocalories. This
reaction would be exothermic if the potential energy of the reactants were
A. 50 kcal
B. 20 kcal
C. 30 kcal
D. 80 kcal
27. Which potential energy diagram represents an exothermic reaction?
A.
B.
C.
D.
28. A sample of water is cooled from 45ºC to 25ºC by the removal of 83.7 joules of heat. What is the
mass of the water?
A. 1.0 g
B. 2.0 g
C. 20 g
D. 200 g
29. How many kilojoules of heat are needed to raise the temperature of 500 grams of water from 15ºC
to 20ºC?
A. 4.2
B. 10.5
C. 41.8
D. 4184
30. If 2092 joules of heat energy are released when 50 grams of water are cooled and the initial
temperature is 70ºC, what is the final temperature?
A. 41.8ºC
B. 80ºC
C. 60ºC
D. 10ºC
Matching:
31. Heat
32. Temperature
33.
Law of Conservation
of Energy
34. Calorimeter
35. Specific Heat
A. A measure of the random motions of the average kinetic energy of
a substance.
B. A device used to measure the amount of heat absorbed or released
during chemical or physical processes.
C. Energy that always flows from a warmer object to a cooler object
(high concentration to lower concentration).
D. In any chemical or physical process, energy is neither created nor
destroyed.
E. The amount of heat required to raise the temperature of 1 gram of a
substance 1⁰C.
36. Given the equation: 18
F  18
O + X, which symbol, when substituted for X, correctly balances the
9
8
equation?
0
0
A. 11 H
B. 10 n
C. −1
e
D. +1
e
37. In the equation X  42 He + 216
At, the element represented by X is
85
A. Fr
B. Bi
C. Rn
D. Ra
38. In the reaction 75
As + X  78
Br + 10 n, X represents
33
35
A. An alpha particle
C. A proton
B. A beta particle
D. A triton
39. Given the reaction 94 Be + 11 H  42 He + X, which species is represented by X?
A. 83 Li
B. 63 Li
C. 85 B
D. 10
B
5
40. Given the nuclear equation 11 H + X  63 Li + 42 He, the particle represented by X is
A. 94 Li
B. 94 Be
C. 10
Be
D. 10
C
5
6
41. Which element is associated with radioactive dating of old artifacts?
A. C-14
B. O-17
C. Al-28
D. none of the above
42. Choose the correct coefficient for the underlined compound. Sodium phosphate and nickel (II)
carbonate produce sodium carbonate and nickel (II) phosphate
A. 1
B. 2
C. 3
D. 6
43. Choose the correct coefficient for the underlined compound. Aluminum hydroxide reacts with
potassium bromide to produce aluminum bromide and potassium hydroxide
A. 1
B. 4
C. 2
D. 3
44. Choose the correct coefficient for the underlined compound. NaOH + H2 SO 4  Na 2 SO 4 + H2 O
A. 1
B. 2
C. 3
D. 4
45. Choose the correct coefficient for the underlined compound. Mg (s) + O 2(g)  MgO(s)
A. 2
B. 3
C. 1
D. 4
46. Predict the product, balance the equation, and choose the correct coefficient for the underlined
compound. Zinc reacts with hydrochloric acid to produce
A. 0.5
B. 2
C. 3
D. 4
47. Predict the product, balance the equation, and choose the correct coefficient for the underlined
compound. Ethane (C2H6) combusts
A. 6
B. 2
C. 3
D. 1
48. Predict the product, balance the equation, and choose the correct coefficient for the underlined
compound. Manganese (VI) oxide reacts with calcium chloride to produce
A. 1
B. 6
D. 2
D. 3
49. If 15.0 g of hydrogen reacts with 85.0 g of nitrogen and 10.5 g of NH3 is produced. What is the
percent yield of this reaction? 3H2 + N2  2NH3
A. 57.7%
C. 33.5%
B. 1.73%
D. 12.4%
50. Magnesium nitride is formed in the reaction of magnesium metal with nitrogen gas. The reaction
of 112 g of nitrogen with 145 g of magnesium produces: 3Mg + N2  Mg3N2
A. 2.0 mol of Mg3N2
C. 4.0 mol Mg3N2
B. 6.0 mol of Mg3N2
D. 1.0 mol Mg3N2
Matching 51. Involves the exchange of cations between two compounds.
A. Single Replacement
52. Reaction of a pure element with a compound.
B. Synthesis
53. Reaction that consumes oxygen to produce oxygen and water.
C. Decomposition
54. The combining of two or more elements to form a single product.
D. Combustion
55. A single reactant is broken down.
E. Double Replacement
56. 3Mg + N2  Mg3N2
57. 2HCl(aq) + Mg(OH)2(s)  MgCl2(aq) + 2H2O(l)
58. Cu + 2AgNO3  2Ag + Cu(NO3)2
59. H2O2  O2 + H2
60. C3H8 + 5O2  4H2O + 3CO2
Chemistry Final Review
Answer Sheet
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