Read each question and choose the best answer. Then fill in the circle on your answerdocument for the answer you have chosen.
SAMPLE
Which of the following is a balanced equation?
ABCD 2 2 2H Br HBr+ →
H Br HBr2 22 2+ →H Br HBr2 2+ →H Br HBr2 2 2+ →
4
1
A student performed a series of titrations to find the concentration of anunknown acid. The results of the titrations are shown in the data table. Whatis the mean of this set of data?
A 0.971 MB 0.976 MC 0.984 MD 1.00 M
Trial12345
Concentration0.971 M0.982 M1.02 M
0.971 M0.976 M
2 Iodine-131 is a radioactive isotope with a half-life of 8 days. How manygrams of a 64 g sample of iodine-131 will remain at the end of 24 days?
F 56 gG 48 gH 32 gJ 8 g
3 Which of the following is the correct name for the compound
A Manganese fluoride(III)B Manganese(III) fluorideC Manganese(I) fluoride(III)D Manganese(III) fluoride(III)
MnF ?3
5
4 The name of the salt formed by the neutralization of hydrochloric acid andsodium hydroxide is —
F sodium chlorideG sodium chlorateH sodium chloriteJ sodium hypochlorite
6
The coefficients necessary to balance the equation correctly are —
FGHJ a 2, b 2, c 1, d 1= = = =
a 1, b 1, c 1, d 1= = = =a 1, b 2, c 1, d 2= = = =a , b 1, c 1, d 2= = = =2
a Mg(OH) b HCl c MgCl d H O2 22 + → +
5 If the quantity of heat lost or gained is
what is the amount of heat required to raise 200.0 g of water from 22.00°C to
100.0°C? Specific heat of water is
A 652.1 joulesB 6,521 joulesC 65,210 joulesD 652,100 joules
4 180. J
g °C.
i
( H) mass change in T specific heat,� = × ×
6
7 A balloon is filled with 3.8 L of helium gas at STP. Approximately how manymoles of helium are contained in the balloon?
A 0.17 molB 0.26 molC 72 molD 85 mol
8 Which of these elements has the smallest atomic radius?
F Beryllium (Be)G Oxygen (O)H Sodium (Na)J Sulfur (S)
9 If 250.0 mL of a 0.96 M solution of acetic acid are diluted to
800.0 mL, what will be the approximate molarity of the final solution?
A 0.19 MB 0.24 MC 0.30 MD 0.77 M
(C H O )2 4 2
7
10 An atom contains 70 protons, 70 electrons, and 99 neutrons. What is themass number?
F 239G 169H 140J 70
11 Which set of equipment would be most useful to determine the density of a liquid?
A Balance and periodic tableB Periodic table and thermometerC Balance and graduated cylinderD Graduated cylinder and thermometer
13
The picture shows a filtration process. Which of these is least likely to passinto the test tube?
A Dissolved gasesB Dissolved saltsC Liquid solventsD Solid particles
Funnel
Original mixture
Filter paper
Residue
Filtrate
Testtube
Test tube
8
12 Sodium chloride conducts electricity when dissolved in water. What type ofbond is present in NaCl?
F Nonpolar covalentG Polar covalentH HydrogenJ Ionic
9
14 Which of the following represents the Lewis dot diagram of ammonia
F
G
H
JN HHH
N HHH
H
N HH
H
N HHH
(NH ?3)
15 After 1911, most scientists accepted the theory that the nucleus of an atomwas very dense and very small and had a positive charge. What led scientiststo accept this theory?
A Dalton’s theory of the atom was over 100 years old.B Scientists before 1911 used the scientific method of inquiry improperly.C A new model proved that the quantum theory of the atom was inaccurate.D Rutherford did an experiment firing alpha particles at a thin piece of gold foil.
10
16 A sodium atom has an electron configuration of If the sodiumatom becomes ionized, its new electron configuration will be the same aswhich element?
F LithiumG NeonH MagnesiumJ Potassium
1 2 2 32 2 6 1s s p s .
17 Which reaction is correctly balanced?
A
B
C
D Fe CuSO FeSO Cu+ +→2 24 4
2 24 4
Fe CuSO FeSO Cu+ +→Fe CuSO FeSO Cu+ +→
4 4
Fe CuSO FeSO Cu4 4
+ +→
18 Which of the following particles has a positive one charge?
F AlphaG ElectronH NeutronJ Proton
( )+1
11
19 What is the mass of one mole of
A 24 gB 28 gC 44 gD 56 g
CO ?2
20 According to the periodic table, Mg will most likely react with elements inwhich of these groups?
F 1G 3H 17J 18
12
21
A sample of a gas is in a cylinder as shown. If the temperature is keptconstant and the piston moves down to decrease the volume, the pressureincreases because the gas particles —
A expandB lose velocity within the containerC become smallerD collide more frequently with the container
22 Which of the following shows the correct number of atoms of each element inthe formula
F 1 magnesium atom, 2 nitrogen atoms, and 6 oxygen atomsG 1 magnesium atom, 2 nitrogen atoms, and 5 oxygen atomsH 1 magnesium atom, 1 nitrogen atom, and 6 oxygen atomsJ 1 magnesium atom, 1 nitrogen atom, and 5 oxygen atoms
Mg NO ?2
( )3
13
23 A student is given a container of potassium nitrate crystals. In order todetermine the exact mass of the potassium nitrate using a triple beambalance, he must know the —
A mass of the filled container and the chemical formula for potassium nitrateB mass of the filled container and the density of potassium nitrateC volume of the filled container and the volume of the potassium nitrateD mass of the empty container and the mass of the filled container
24 C-12 and C-13 are naturally-occurring isotopes of the element carbon. C-12 occurs 98.89% of the time and C-13 occurs 1.108% of the time. Whatcalculation should be used to determine the atomic mass of this element?
F
G
H
J ( . )12 0 9889×
( . ) . )12 0 9889 0 01108× + ×(13
( . )12 0 9889 0× − ×(13 .01108)
( . )12 0 01108 0× + ×(13 .9889)
2
25
The general equation shown is a reaction that is an —
A exothermic decompositionB endothermic decompositionC endothermic synthesisD exothermic synthesis
AB + energy A + B
14
26
Examine the graph of the temperature of a compound versus heat added tothe compound. Which of the following most likely happens as the compoundis heated from point x to point y?
F The phase of the compound changes.G The mass of the compound is increasing.H The molecules of the compound lose potential energy.J The molecules of the compound are breaking apart into atoms.
Tem
per
atu
reHeat
x
y
27 In order to determine the identity of a substance, a student listed thefollowing properties. Which of the following is a chemical property?
A Oxidizes in airB Conducts an electric currentC Attraction to a magnetD Dissolves in water
15
28 The following results of a scientific study on water were found in a chemistry handbook.
What is the independent variable in the study?
F Molar massG Melting pointH Vapor pressureJ Temperature
00
100200300400500600700800
10 20 30 40 50Temperature
(°C)
Vapor Pressure of Water
Properties of WaterMolar Mass: 18.015 g/mole
Melting Point: 0.0°CBoiling Point: 100.0°C
Vap
or
Pre
ssu
re(m
m H
g)
60 70 80 90 100
29 Which of the following is a solid/solid solution?
A An alloy of gold and copperB A mixture of argon and kryptonC A strongly electrolytic acidD A neutralized base
16
30 Which of these compounds is most likely to contain an ionic bond?
F
G
H
J CaCl2
CH4
SO2
H2
31 The composition of dry air is approximately 78% nitrogen, 21% oxygen, and 1% other gases. What is the partial pressure of nitrogen at standardatmospheric pressure (101.3 kPa)?
A 21.0 kPaB 79.0 kPaC 101.3 kPaD 760.0 kPa
32 A gas has a volume of 100.0 mL at a pressure of 600.0 mm Hg. If thetemperature is held constant, what is the volume of the gas at a pressure of800.0 mm Hg?
F 33.33 mLG 66.67 mLH 75.00 mLJ 133.0 mL
17
33 Which of the following solutions will have the greatest concentration?
A 2 moles of solute dissolved in 1 liter of solutionB 0.3 mole of solute dissolved in 0.6 liter of solutionC 2 moles of solute dissolved in 10 liters of solutionD 0.1 mole of solute dissolved in 0.5 liter of solution
34
The chemical equation shown is an example of a —
F single-replacement reactionG synthesis reactionH decomposition reactionJ double-replacement reaction
Cu 2AgNO Cu(NO ) 2Ag3 3 2+ → +
35 Which element is a noble gas?
A Fluorine (F)B Hydrogen (H)C Nitrogen (N)D Xenon (Xe)
18
36 To determine if a reaction is exothermic, a student should use a —
F pH probeG motion sensorH pressure sensorJ temperature probe
38 A student hypothesizes that the solubility of a particular solute in water isnearly constant as temperature varies. The student can best test thehypothesis by doing which of the following?
F Researching the chemical properties of many different solutesG Measuring the solubility of the solute at five different temperaturesH Drawing diagrams of the molecular structures of water and of the soluteJ Measuring the solubility of several different solutes at a fixed temperature
19
39
Which set of coefficients will balance this equation?
A 3, 1, 1B 2, 3, 2C 3, 2, 3D 2, 6, 2
? P ? Br ? PBr+ →2 3
20
40
The table shows the measurements of the volume and the pressure of aportion of a gas at constant temperature. After graphing, the data revealsthat the volume is —
F inversely proportional to pressureG directly proportional to pressureH inversely proportional to pressure squaredJ directly proportional to pressure squared
Volume(m3)
Vo
lum
e (m
3)
Pressure (kPa)
Pressure(kPa)
0.8
0.3
0.4
0.5
1.0
203
498
409
247
150
41 What is the correct name for the compound
A Phosphoric acidB Phosphorus oxideC Phosphorus(IV) oxideD Tetraphosphorus hexoxide
P O ?4 6
21
42
To which category does this reaction belong?
F SynthesisG DecompositionH Single replacementJ Double replacement
2 2Fe(s) O g FeO(s)2
+ →( )
43 As heat is added to a substance undergoing a phase change, the temperatureremains constant because the energy is being used to —
A break covalent bondsB lower the specific heat capacityC overcome intermolecular forcesD oppose electron cloud repulsions
44
How many moles of hydrogen gas are produced when 0.066 mole of sodium iscompletely reacted?
F
G
H
J 0 099. mol H2
0 066. mol H2
0 033. mol H2
0 022. mol H2
2 2 22 2
Na H O NaOH H+ → +
22
45 The accepted value for the specific heat of aluminum is Which
of the following sets of specific heat values for aluminum, calculated from a
prior experiment, has the greatest accuracy and precision?
A
B
C
D 0 936. Jg °C
, 0.876 Jg °C
, 0.879 Jg °Ci i i
0 897. Jg °C
, 1.04 Jg °C
, 1.03 Jg °Ci i i
0 896. Jg °C
, 0.899 Jg °C
, 0.896 Jg °Ci i i
0 847. Jg °C
, 0.847 Jg °C
, 0.848 Jg °Ci i i
0 897. Jg °C
.i
46 A 1.0 M aqueous solution of which substance would have the lowest pH?
FGHJ NaF
Ba(OH)2
HClNH3
47 What is the chemical formula for iron(II) phosphide?
ABCD Fe P3 2
FeP2
Fe P2 3
Fe P2
23
48 In a mixture of oxygen and nitrogen gas, 80.0 percent of the totalgas pressure is exerted by the nitrogen. If the total pressure is 2.0 atm, whatpressure does the oxygen exert?
F 0.20 atmG 0.40 atmH 0.80 atmJ 1.6 atm
( )N2
(O2)
49
Phosphoric acid, is neutralized by magnesium hydroxide, according to the equation shown. How many moles of water will be producedfrom the neutralization of 0.24 mole of
A 0.24 molB 0.48 molC 0.72 molD 1.44 mol
H PO ?3 4
Mg(OH) ,2H PO ,3 4
2 3 63 4 2 3 4 2 2H PO Mg(OH) Mg (PO ) H O+ → +
Answer Key-EOC015-S0118Test
SequenceNumber
Correct Answer
Reporting Category Reporting Category Description
1 C 001 Scientific Investigation2 J 002 Atomic Structure and Periodic Relationships3 B 003 Nomenclature, Chemical Formulas, and Reactions 4 F 004 Molar Relationships 5 C 005 Phases of Matter and Kinetic Molecular Theory 6 G 003 Nomenclature, Chemical Formulas, and Reactions 7 A 004 Molar Relationships 8 G 002 Atomic Structure and Periodic Relationships9 C 004 Molar Relationships
10 G 002 Atomic Structure and Periodic Relationships11 C 001 Scientific Investigation 12 J 003 Nomenclature, Chemical Formulas, and Reactions 13 D 001 Scientific Investigation 14 F 003 Nomenclature, Chemical Formulas, and Reactions 15 D 001 Scientific Investigation 16 G 002 Atomic Structure and Periodic Relationships17 B 003 Nomenclature, Chemical Formulas, and Reactions 18 J 002 Atomic Structure and Periodic Relationships19 C 004 Molar Relationships 20 H 003 Nomenclature, Chemical Formulas, and Reactions 21 D 005 Phases of Matter and Kinetic Molecular Theory22 F 003 Nomenclature, Chemical Formulas, and Reactions 23 D 001 Scientific Investigation 24 H 002 Atomic Structure and Periodic Relationships25 B 003 Nomenclature, Chemical Formulas, and Reactions 26 F 005 Phases of Matter and Kinetic Molecular Theory27 A 002 Atomic Structure and Periodic Relationships28 J 001 Scientific Investigation 29 A 005 Phases of Matter and Kinetic Molecular Theory30 J 003 Nomenclature, Chemical Formulas, and Reactions 31 B 005 Phases of Matter and Kinetic Molecular Theory32 H 005 Phases of Matter and Kinetic Molecular Theory33 A 004 Molar Relationships 34 F 003 Nomenclature, Chemical Formulas, and Reactions 35 D 002 Atomic Structure and Periodic Relationships36 J 001 Scientific Investigation 37 A 003 Nomenclature, Chemical Formulas, and Reactions 38 G 001 Scientific Investigation 39 B 003 Nomenclature, Chemical Formulas, and Reactions 40 F 001 Scientific Investigation 41 D 003 Nomenclature, Chemical Formulas, and Reactions 42 F 003 Nomenclature, Chemical Formulas, and Reactions 43 C 005 Phases of Matter and Kinetic Molecular Theory44 G 004 Molar Relationships 45 B 001 Scientific Investigation 46 G 004 Molar Relationships 47 D 003 Nomenclature, Chemical Formulas, and Reactions 48 G 005 Phases of Matter and Kinetic Molecular Theory49 C 004 Molar Relationships
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