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93_1_1st Exam
九十三年度第一學期普通化學第一次段考
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□ 養殖系一年 B 班
□ 海科系一年 A 班
學號__________________________
Multiple choice questions (2 points each)
1. Which one of the following is a chemical property of iron?
A) The rust formed on iron is brown
B)
C)
D)
E)
Iron is used in construction
Iron corrodes to form rust
Iron has a higher density than water
Iron conduct electricity
Answer: C
2. Which word is inconsistent with scientific knowledge?
A) testable
B) reproducible
C) provable
D) explanatory
E) tentative
Answer: C
3. Which of the following is not an example of matter ?
A) wood
B) water
C) air
D) light
E) atoms
Answer: D
4. How many μg are in 0.0158 g?
A) 1.58×10–4
B) 1.58×10–6
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C) 1.58
D) 1.58×106
E) 1.58×104
Answer: E
5. The high temperature during a summer day was observed to be 92ºF. What was this
temperature in ºC?
A) 28
B) 33
C) 42
D) 103
E) 128
Answer: B
6. How many liters are there in a cubic centimeter?
A) 10–6
B) 10–3
C) 103
D) 106
E) l09
Answer: B
7. Which of the following physical quantities is not a base unit of the SI ?
A) mass
B) length
C) volume
D) time
E) temperature
Answer; C
8. Which measurement is expressed using 3 significant figures ?
A) 0.0232 kg
B) 34.20 cm
C) 68.003 g
D) 10,550 m
E) 222.0 km
Answer: A
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9. Which of the following measurements would be considered exact?
A) 1.83g
B) 2 in.
C) 8 pennies
D) 30 miles
E) 32 sec.
Answer: C
10. Perform the indicated operations and express the answer in cm with the proper
number of significant figures.
28.1 cm + 0.53 cm + 75.321 cm = ?
A) 104.0
B) 103.95
C) 103.951
D) 104
E) none of these
Answer: A
11. Convert 55 miles per hour to meters per second. (1 mi = 5280 ft; 1 in = 39.37 in.)
A) 25
B) 88
C) 2.4 x 10–2
D) 3300
E) 42
Answer: A
12. Perform the indicated operations and give the answer in g/cm3 with the proper
number of the significant figures.
1.2055 g ÷ 2.38 cm3 = ?
A) 0.51
B) 0.506
C) 0.507
D) 0.50651
E) 0.506512605
Answer: B
13. The ________ of a set of measurements refers to how closely individual
measurements agree with one another.
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A) accuracy
B) detection limit
C) precision
D) sensitivity
E) significant figures
Answer: C
14. A person tries to start his car in the morning and it does not start. He thinks the car
may be out of gas. His idea concerning why the car does not start is an example of
A) a law
B) an experiment
C) a hypothesis
D) data
E) a theory
Answer: C
15. Which of the following element's symbols is based on a Latin name?
A) As
B)
C)
D)
E)
Au
Pr
Co
La
Answer: B
16. A(n)
is a mixture that is homogeneous, which means that its
composition and properties are the same throughout.
A) solution
B) solvent
C) compound
D) element
E) atom
Answer: A
17. A chlorine-oxygen compound is found to have a chlorine to oxygen mass ratio of
1.109. Which of the following chlorine to oxygen mass ratios is possible for a
different chlorine-oxygen compound?
A) 1.000
B) 1.214
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C) 2.428
D) 4.437
E) 5.014
Answer: D
18. An
atom
A) molar mass
B) molecular mass
unit is defined as exactly one-twelfth the mass of a carbon-12
C) atomic mass
D) automobile mass
E) formula mass
Answer: C
19. An 56Fe2+ particle contains
A) 28 protons, 28 neutrons and 26 electrons.
B) 26 protons, 30 neutrons and 24 electrons.
C) 26 protons, 26 neutrons and 26 electrons.
D) 58 protons, 58 neutrons and 56 electrons.
E) 54 protons, 56 neutrons and 52 electrons.
Answer: B
20. Which of the following is a pair of isobars?
A) 14C – 14N
B) 23Na – 24Mg
C) 1H – 2H
D) 8lBr – 35Cl
E) 19F – 7Li
Answer: A
21. Natural occurring lithium consists of the two isotopes: lithium-6 and lithium-7.
The atomic mass of lithium is approximately 6.9. What are reasonable estimates of
the relative percentages of lithium-6 and lithium-7, respectively?
A) 10, 90
B) 25, 75
C) 50, 50
D) 75, 25
E) 90, 10
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Answer: A
22. A column of Periodic Table is called a
A) caste.
B) group.
C) period.
D) homologous series
E) system.
Answer: B
23. Which of the following is a metalloid ?
A) S
B) Ga
C) Sn
D) In
E) Sb
Answer : E
24. Which of the following compounds is molecular?
A) Fe2O3
B) NaOH
C) NF3
D) CuCl2
E) CdS
Answer: C
25. Predict the product formed when calcium, Ca, combines with arsenic, As?
A) Ca3As2
B) Ca2As3
C) CaAs
D) CaAs2
E) Ca2As
Answer: A
26. Which substance is incorrectly labeled?
A) Na2SO4 •10H2O, a hydrate
B) H3PO4, an acid
C) KOH, a base
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D) PF3, a salt
E) C3H8O3, an organic compound
Answer : D
27. Name the straight chain hydrocarbons shown below in the order given:
C4H10, C5H22, C3H8
A) propane, pentane, butane
B) propane, hexane, ethane
C) butane, pentane, propane
D) propane, butane, ethane
E) butane, pentane, ethane
Answer: C
28. Name the functional group in CH3CH2CH2OH
A) alkane
B) alcohol
C) alkene
D) carboxylic acid
E) aldehyde
Answer: B
29. What is the name of the binary compound, CCl4
A) carbon tetrachloride
B) methylene chloride
C) carbon chloride
D) carbon (IV) tetrachloride
E) methane
Answer : A
30. Aqueous HI is known as
A) hydroiodic acid.
B) hydrogen iodide.
C) helium iodide.
D) hydrogen monoidide
E) hyperiodous acid
Answer : A
31. What is the nearest mass (in amu ) of an atom if it contains 9 neutrons, 11 protons,
7
and l3 electrons?
A) 20
B) 30
C) 11
D) 24
E) 22
Answer : A
32. Which ion is not correctly paired with its name?
A) Fe2+, iron(II) ion
B) N3–, nitride ion
C) Al3+, aluminum ion
D) Cr3+, chromium(III) ion
E) O–, oxide ion
Answer: E
33. Which description below best describes this structure?
A) cyclic alkane
B) straight-chain alkane
C) alcohol
D) branched alkan
E) carboxylic acid
Answer: D
34. The Stock system name for CrSO3 is
A) chromium sulfide
B) chromium (II) sulfite
C) chromium (II) sulfate
D) chromium (III) sulfite
E) chromium sulfur oxide
Ans: B
35. Calculate the formula mass of ammonium nitrate, a substance used both as a
fertilizer and as an explosive.
A) 80.04
B) 198.08
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C) 160.10
D) 142.06
E) 63.04
Answer: A
36. Calculate the number of moles of water present in a 10.0 kg sample.
A) 55.5
B) 555
C) 1.80 x 103
D) 1.80 x 105
E) none of these
Answer : B
37. How many iron ions (Fe3+) are present in 43.6 g FeCl3?
A) l.62 x l023
B) 6.50 x1023
C) 4.23x1023
D) 3.72
E) 0.807
Answer: A
38. Calculate the mass, in grams, of 1.0 mol of oxygen gas.
A) l.0
B) 16
C) 12
D) 32
E) 28
Answer: D
39. Which of the following could be an empirical formula ?.
A) C2H6
B) C6H12O6
C) C3H8
D) C2H2Cl2
E) C60H60
Answer: C
40. What is me mass percent composition of carbon in a 0.100 g sample of a
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carbon-hydrogen-oxygen compound? The compound, when combusted in oxygen,
provided 0.220 g CO2 and 0.239 g water.
A) 80.6
B) 4.16
C) 45.5
D) 8.76
E) 60.0
Answer: E
41. What coefficient is required for HNO3 to balance the following equation ?
3 Cu + ˍ HNO3 → 3 Cu(NO3)2 + 2 NO + 4H2O
A) 2
B) 3
C) 4
D) 6
E) 8
Answer: E
42. How many moles of oxygen gas are required to burn 2.8 mol octane, C8H18 ?
A) 2.8
B) 5.6
C) 35
D) 22.4
E) 12.5
Answer: C
43. Aluminum and oxygen react according to the following equation
4 Al (s) + 3 O2 (g) → 2 Al2O3 (s)
In a certain experiment, 4.6 g Al was reacted with excess oxygen and 6.8 g of product
was obtained. What was the percent yield of the reaction?
A) 78
B) 74
C) 68
D) 63
E) 34
Answer: A
44. A 10.00-mL sample of 0.254 M H2SO4 is titrated with 0.385 M NaOH. What
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volume of the NaOH solution, in mL, is required?
A) 6.60
B) 30.3
C) 15.1
D) 10.0
E) 13.2
Answer: E
45. What is the coefficient of TiCl4(s) after the reaction shown below is balanced ?
TiO2 (s) + C (s) + Cl2(g) → TiCl4(s) + CO(g)
A) 1
B) 0
C) 2
D) 3
E) 4
Answer: A
46. What is the molarity of 969 mL aqueous solution containing 0.36 mol of KI?
A) 0.37
B) 0.062
C) 0.00037
D) 0.35
E) 0.00000037
Answer: A
47. In the reaction of aluminum metal and oxygen gas to make aluminum oxide, how
many moles of aluminum will react with 1.6 grams O2?
A) 0.067
B) 38
C) 2.1
D) 0.13
E) 0.20
Answer: A
48. Which of the following are incorrectly paired?
A) Na, alkali metal
B) Mg, alkaline earth metal
C) Br, halogen
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D) Ar, noble gas
E) Se, transition metal
Ans: E
49. The chemical name for ClO2– is chlorite ion, Therefore, the name of HClO2 is
A) hydrochloric acid
B) chloroforml
C) hydrogen dioxychloride
D) chlorous acid
E) chloric acid
Ans: D
50. __________ are compounds having the same molecular formula but different
structural formulas.
A) Isotopes
B) Isobars
C) Isotopes
D) Isotonic solutions
E) Isopleths
Ans: C
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