Download Exam 961-1st Name___________________________________

Exam 961-1st
Name___________________________________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) Which of the following gives the correct numbers of protons, neutrons, and electrons in a neutral atom of
118
Sn?
50
A) 118 protons, 50 neutrons, 118 electrons
B) 50 protons, 50 neutrons, 50 electrons
C) 118 protons, 118 neutrons, 50 electrons
D) 50 protons, 68 neutrons, 50 electrons
E) 68 protons, 68 neutrons, 50 electrons
Answer: D
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2) The mass number of iron is __________.
A) 26
B) 56
C) 55.85
D) 29.85
E) 27.78
Answer: B
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3) Protons, neutrons, and electrons are examples of __________.
A) ions
B) metals
C) subatomic particles
D) elements
E) compounds
Answer: C
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4) A 100.0 g sample of eighteen karat gold is contains 75.0 g of gold and 25.0 g of other metals. What is the percent
of gold in the sample?
A) 75.0%
B) 25.0%
C) 50%
D) 100.0%
E) 125%
Answer: A
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5) The density of a solution is 1.18 g/L, and its volume is 25.0 mL. The mass of the sample is __________.
A) 25.0 g
B) 1.18 g
C) .0472 g
D) 0.0295 g
E) 21.2 g
Answer: D
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6) In the following reaction, what is the correct coefficient for aluminum chloride?
Al + Cl2
A) 1
AlCl3
B) 2
C) 3
Answer: B
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1
D) 4
E) 5
7) The compound MgCl2 is named __________.
A) magnesium chloride
B) dimagnesium chloride
C) magnesium dichloride
D) magnesium chlorine
E) magnesium (II) chloride
Answer: A
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8) What is the formula of a compound that contains Na+ and PO4 3- ions?
A) Na3PO4
B) Na3PO3
C) Na3P
D) NaPO4
E) Na2PO3
Answer: A
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9) Which element would have physical and chemical properties similar to chlorine?
A) Ar
B) Br
C) P
D) S
E) O
Answer: B
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10) According to the Atomic Theory,
A) a compound can contain different numbers of atoms as long as it has the same kinds of atoms.
B) atoms of different element combine to form compounds.
C) all atoms are different.
D) all matter is made up of tiny particles called electrons.
E) atoms are created and destroyed during a chemical reaction.
Answer: B
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11) Ca is the symbol for __________.
A) cobalt
B) cadmium
C) copper
D) calcium
E) carbon
Answer: D
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12) One distinguishing physical property of the element mercury is __________.
A) it does not conduct electricity
B) it is a liquid at room temperature
C) it has a dull, blackish appearance
D) it is less dense than water
E) it is soluble in water
Answer: B
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13) A neutron has an electrical charge of __________.
A) +1
B) -2
C) -1
Answer: E
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2
D) +2
E) 0
14) Which of the following examples illustrates a number that is correctly rounded to three significant figures?
A) 103.692 grams to 103.7 grams
B) 109 526 grams to 109 500 grams
C) 0.03954 grams to 0.040 grams
D) 4.05438 grams to 4.054 grams
E) 20.0332 grams to 20.0 grams
Answer: E
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15) What is the symbol for the ion with 19 protons and 18 electrons?
A) Ar+
B) FC) F+
D) K-
E) K+
Answer: E
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16) When gold is melted and formed in a mold to make a piece of jewelry, what type of change is taking place?
A) boiling
B) a physical change
C) a chemical change
D) a change of size
E) evaporation
Answer: B
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17) CFCs are broken down in the atmosphere by __________.
A) ozone
B) UV light
C) nitrogen dioxide
D) iron
E) AIDS
Answer: B
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18) How many electrons will aluminum gain or lose when it forms an ion?
A) lose 1
B) gain 5
C) gain 1
D) lose 3
E) lose 2
Answer: D
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19) What is the correct formula for the oxide ion?
A) O3+
B) O
C) O2+
D) O+
E) O2-
Answer: E
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20) A chemical equation is balanced when
A) the total number of ions is the same in reactants and products.
B) the sum of the coefficients of the reactants is equal to the sum of the coefficients of the products.
C) the number of atoms of each element is the same in reactants and products.
D) the charge on each atom is the same in reactants and products.
E) the total number of molecules is the same in reactants and products.
Answer: C
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21) Significant figures are important because they indicate __________.
A) the number of digits in a measurement
B) the number of measurements
C) the number of digits on a calculator
D) a counted number
E) the accuracy of the conversion factor
Answer: A
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22) Which of the following gives the balanced equation for this reaction?
K3 PO4 + Ca(NO3 )2
Ca3(PO4 )2 + KNO3
A) K3 PO4 + Ca(NO3 )2
B) 2 K3 PO4 + Ca(NO3)2
Ca3(PO4 )2 + KNO3
Ca3(PO4)2 + 6KNO3
E) 2K3PO4 + 3Ca(NO3 )2
Ca3 (PO4)2 + 6KNO 3
C) KPO4 + CaNO3 + KNO3
Ca3(PO4 )2 + 3KNO3
D) K3 PO4 + Ca(NO3 )2
Answer: E
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23) How many centimeters are there in 57.0 in?
A) 22.4 cm
B) 140 cm
C) 145 cm
D) 22 cm
Answer: C
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24) The measurement 0.0000043 m, expressed correctly using scientific notation, is __________.
A) 4.3 m
B) 4.3 × 10-7 m
C) 4.3 × 10-6 m
D) 4.3 × 106 m
E) 0.43 × 10-5 m
Answer: C
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25) Which of the following is a chemical change?
A) bending a steel rod
B) melting gold
C) burning sugar
D) making a snowman
E) cutting a rope
Answer: C
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4
E) 0.0445 cm
26) One mol of particles of any substance contains how many particles?
A) 3 × 1010
B) 3 × 10-10
C) 6.022 × 1023
D) 106
E) 6.022 × 10-23
Answer: C
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27) Which of the following elements is a noble gas?
A) nitrogen
B) oxygen
C) argon
D) chlorine
E) bromine
Answer: C
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28) Which of the following is an example of a physical change?
A) converting water to hydrogen and oxygen
B) grinding coffee beans
C) burning coal
D) baking a cake
E) digesting a cheeseburger
Answer: B
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29) Which of the quantities below has the largest mass?
A) 2 mol of carbon
B) 2 mol of lithium metal
C) 5 mol of hydrogen gas
D) 5 mol of aluminum metal
E) 6 mol of helium gas
Answer: D
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30) Which of the following descriptions of a subatomic particle is correct?
A) A proton has a positive charge and a mass of approximately 1 amu.
B) A neutron has no charge and its mass is negligible.
C) A proton has a positive charge and a negligible mass.
D) An electron has a negative charge and a mass of approximately 1 amu.
E) A neutron has a positive charge and a mass of approximately 1 amu.
Answer: A
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31) Which of the following is the basic unit of volume in the metric system?
A) meter
B) gram
C) liter
D) kilogram
Answer: C
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5
E) centimeter
32) What is the Celsius temperature that equals to 86 degree Fahrenheit?
A) 20
B) 18
C) 25
D) 40
E) 30
D) 5210 m
E) 0.00521 km
Answer: E
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33) 5.21 cm is the same distance as __________.
A) 0.0521 m
B) 5.21 mm
C) 52.1 dm
Answer: A
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34) Which of the following polyatomic ions has a positive charge?
A) nitrate
B) hydroxide
C) ammonium
D) hydrogen carbonate
E) cyanide
Answer: C
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35) Water, H2O, is an example of a(n) __________.
A) element
B) chemical
C) electric charge
D) solid
E) wave
Answer: B
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36) Isotopes are atoms of the same element that have __________.
A) the same atomic mass but different numbers of protons
B) the same atomic numbers but different numbers of protons
C) the same atomic numbers but different numbers of electrons
D) the same atomic number but different numbers of neutrons
E) different atomic numbers
Answer: D
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37) Given the following equation, what is the correct form of the conversion factor needed to convert the number of
moles of O2 to the number of moles of Fe2O3 produced?
4Fe + 3O2
A)
B)
2Fe2 O3
3 mol O2
2 mol Fe2 O3
2 mol Fe2 O3
4 mol Fe
C)
4 mol Fe
2 mol Fe2 O3
D)
4 mol Fe
3 mol O2
E)
2 mol Fe2 O3
3 mol O2
Answer: E
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38) The mass number of an atom can be calculated from the __________.
A) number of electrons plus protons
B) number of protons
C) number of electrons
D) number of neutrons
E) number of protons plus neutrons
Answer: E
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39) The number of neutrons in an atom is equal to the __________.
A) mass number + the atomic number
B) atomic number
C) mass number
D) mass number - the atomic number
E) number of protons
Answer: D
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40) When a firecracker explodes, giving off light and heat, and breaking the wrapper into many pieces, __________.
A) a physical change takes place
B) both a physical and a chemical change are taking place
C) a chemical change takes place
D) the wrapper evaporates into a gas
E) the fuse undergoes a physical change only
Answer: B
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41) Sodium is an example of an element that is a __________.
A) nonmetal
B) transition element
C) metal
D) metalloid
E) noble gas
Answer: C
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42) The correct symbol for the isotope of potassium with 22 neutrons is __________.
19
22
41
37
K
K
K
P
A)
B)
C)
D)
41
19
19
15
E)
15
P
37
Answer: C
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43) When 2.50 mol of Mg3N2 are allowed to react, how many moles of H2 O also react?
Mg3 N2 + 6H2 O
3Mg(OH)2 + 2NH3
A) 6.00 mol
B) 15.0 mol
C) 9.00 mol
D) 1.25 mol
E) 2.50 mol
D) tin
E) neon
Answer: B
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44) The element that corresponds to the symbol Ni is __________.
A) nickel
B) nitrogen
C) sodium
Answer: A
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45) Avogadro's number is the number of
A) amu in 1 mol of a substance.
B) grams in 1 mol of a substance.
C) particles in 1 mol of a substance.
D) moles in 6.022 × 1023 amu of an element.
E) moles in 6.022 × 1023 grams of an element.
Answer: C
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46) What elements are in hydroxyapatite, Ca5 (PO4)3OH , a major compound in human bones and teeth?
A) carbon, potassium, oxygen, helium
B) carbon, phosphorus, oxygen, helium
C) carbon, potassium, oxygen, hydrogen
D) calcium, phosphorus, oxygen, helium
E) calcium, phosphorus, oxygen, hydrogen
Answer: E
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47) Which of the following is a characteristic of nonmetals?
A) low melting points
B) good conductors of electricity
C) malleable
D) shiny
E) good conductors of heat
Answer: A
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48) Calculate the molar mass of magnesium chloride, MgCl2.
A) 70.01 g
B) 24.31 g
C) 125.91 g
D) 59.81 g
Answer: E
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49) A hydrocarbon branch off either a carbon chain or a carbon ring is often called an
A) alpha particle
B) alkyl bond
C) alkyl group
D) alkyl force
E) alcohol
Answer: C
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50) In an atom, the nucleus contains __________.
A) only neutrons
B) all the protons and neutrons
C) only protons
D) all the protons and electrons
E) an equal number of protons and electrons
Answer: B
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E) 95.21 g