Deck 3: Atoms, molecules, and Ions

Question 1

What is the atomic symbol for an element that has 30 neutrons and a mass number of 55?

A) At
B) Zn
C) Co
D) Mn
E) Cs

Answer 1

Mn

Question 2

What is the mass number of an argon atom with 22 neutrons?

A) 2
B) 18
C) 22
D) 40
E) 39.95

Answer 2

40

Question 3

What is the identity of ?

A) Ni
B) Zn
C) Rn
D) Ce
E) Pd

Answer 3

Ni

Question 4

How many protons,neutrons,and electrons are in a neutral atom of ⁵⁵Fe?

A) 26 protons,29 neutrons,55 electrons
B) 26 protons,29 neutrons,29 electrons
C) 26 protons,29 neutrons,26 electrons
D) 55 protons,26 neutrons,55 electrons
E) 55 protons,26 neutrons,26 electrons

Question 5

What is the mass of chlorine-35 relative to carbon-12?

A) 0.657
B) 0.522
C) 1.52
D) 2.92
E) 23

Question 6

Which of the following atoms contains the largest number of neutrons?

A)
B)
C)
D)
E)

Question 7

How many protons are there in an atom of scandium-45?

A) 25
B) 66
C) 20
D) 21
E) 24

Question 8

Which of the following atoms contains the fewest protons?

A) (²³²Th)
B) (²³¹Pa)
C) (²⁴⁵Pu)
D) (²³⁸U)
E) (²³²Pa)

Question 9

Two isotopes of a given element will have the same number of ____,but a different number of ____ in their nucleus.

A) protons,electrons
B) electrons,protons
C) protons,neutrons
D) neutrons,protons
E) electrons,neutrons

Question 10

Atoms consist of three fundamental particles.What are these particles and their charges?

A) proton (+1),neutron (neutral)and electron (-1)
B) proton (-1),neutron (+1)and electron (neutral)
C) proton (+1),neutron (-1)and electron (neutral)
D) proton (neutral),neutron (+1)and electron (-1)
E) proton (-1),neutron (neutral)and electron (+1)

Question 11

An atom that has the same number of neutrons as is

A)
B)
C)
D)
E)

Question 12

What is the atomic symbol for an element with 16 protons and 17 neutrons?

A)
B)
C)
D)
E)

Question 13

A neutral atom of the isotope ¹⁹⁷Au contains

A) 197 neutrons and 276 electrons.
B) 79 protons and 197 neutrons.
C) 197 protons and 118 electrons.
D) 197 protons,79 neutrons,and 197 electrons.
E) 79 protons and 118 neutrons.

Question 14

If two different isotopes have the same atomic number,it must mean that

A) they have the same atomic mass.
B) they have the same mass number.
C) they have the same number of protons.
D) they have the same number of electrons.
E) they have the same number of neutrons.

Question 15

Rank the subatomic particles from least to greatest mass.

A) electron mass = proton mass = neutron mass
B) electron mass = neutron mass < proton mass
C) electron mass = proton mass < neutron mass
D) electron mass < proton mass < neutron mass
E) electron mass < proton mass = neutron mass

Question 16

The atomic number of fluorine is ____.

A) 7A
B) 9
C) 10
D) 19
E) 0

Question 17

Atomic number is the________ in the nucleus of an atom.

A) number of electrons
B) number of protons
C) number of protons minus the number of neutrons
D) sum of the number of electrons and neutrons
E) sum of the number of neutrons and protons

Question 18

How many neutrons are there in an atom of gallium-71 ?

A) 31
B) 2
C) 102
D) 71
E) 40

Question 19

Which of the following atoms contains more protons than neutrons?

A)
B)
C)
D)
E)

Question 20

Which of the following statements concerning atomic structure is/are correct?
1)Neutrons and electrons are found in space as a cloud around the nucleus.
2)The nucleus contains all the positive charge of an atom.
3)Electrons surround the nucleus and account for the majority of an atom's volume.

A) 1 only
B) 2 only
C) 3 only
D) 2 and 3
E) 1,2,and 3

Question 21

Which of the following atomic symbols represents an isotope of ?

A)
B)
C)
D)
E)

Question 22

Rubidium has two naturally occurring isotopes.The atomic weight of Rb is 85.4678 u.If 72.15% of Rb is found as Rb-85 (84.9117 u),what is the mass of the other isotope?

A) 0.56 u
B) 85.68 u
C) 86.91 u
D) 86.02 u
E) 83.47 u

Question 23

In which group of the following groups of the periodic table are all the elements nonmetals?

A) 2A
B) 3A
C) 5A
D) 6A
E) 7A

Question 24

Which element belongs to the actinides?

A) curium
B) rubidium
C) barium
D) iodine
E) krypton

Question 25

A certain element consists of two stable isotopes.The first has a mass of 14.0031 amu and a percent natural abundance of 99.63%.The second has a mass of 15.001 amu and a percent natural abundance of 0.37%.What is the atomic weight of the element?

A) 13.95 u
B) 14.00 u
C) 14.01 u
D) 14.50 u
E) 19.50 u

Question 26

The masses of isotopes and their abundances are determined experimentally using

A) a mass spectrometer.
B) an analytical balance.
C) a centrifuge.
D) filtration followed by distillation.
E) electrolysis.

Question 27

What halogen is in the third period?

A) S
B) Cl₂
C) I₂
D) H₂
E) Ar

Question 28

Which of the following statements is true concerning and
?

A) They have the same number of neutrons.
B) They are isotopes.
C) They have the same relative atomic mass.
D) They have the same mass number.
E) They have different chemical properties.

Question 29

A sample of an element consists of two isotopes.The percent abundance of one of the isotopes is 54.0%.What is the percent abundance of the other isotope?

A) 31.0
B) 27.0
C) 23.0
D) 54.0
E) 46.0

Question 30

Copper has an atomic weight of 63.55 u.If 69.17% of Cu exists as Cu-63 (62.93960 u),what is the identity and the atomic mass of the other isotope?

A) Cu-64; 63.82 u
B) Cu-64; 64.16 u
C) Cu-65; 64.16 u
D) Cu-65; 64.92 u
E) Cu-66; 65.91 u

Question 31

What element is in the fourth period in Group 3A?

A) Sb
B) Ga
C) In
D) Si
E) Tl

Question 32

Silver has two stable isotopes with masses of 106.90509 u and 108.9047 u.The atomic weight of silver is 107.868 u.What is the percent abundance of each isotope?

A) 50.0% Ag-107 and 50.0% Ag-109
B) 51.8% Ag-107 and 48.2% Ag-109
C) 55.4% Ag-107 and 44.6% Ag-109
D) 48.2% Ag-107 and 51.8% Ag-109
E) 44.6% Ag-107 and 55.4% Ag-109

Question 33

Which of the following statements is/are CORRECT?
1)The group 3A elements are also known as the chalcogens.
2)The noble gases are sometimes called the rare gases because of their low abundances.
3)The halogens,or group 7A elements,all exist as diatomic molecules.

A) 1 only
B) 2 only
C) 3 only
D) 2 and 3
E) 1,2,and 3

Question 34

The mass spectrum of an element with two naturally occurring isotopes is shown below.What is the best estimate of the element's (average)atomic weight?

A) 10 amu
B) 11 amu
C) 10.8 amu
D) 10.2 amu
E) 10.5 amu

Question 35

The element chlorine has two stable isotopes,chlorine-35 with an atomic mass of 34.97 u and chlorine-37 with an atomic mass of 36.97 u.From the atomic weight found on the periodic table,one can conclude that:

A) both isotopes have the same percent natural abundance
B) there is an isotope of nitrogen with an atomic mass of 35.45 u
C) chlorine-35 has the highest percent natural abundance
D) chlorine-37 has the highest percent natural abundance

Question 36

Which of the following statements is not true about the element iron?

A) It is a metal.
B) It is a transition element.
C) It is in period 4.
D) It has chemical and physical properties most similar to cadmium.
E) It is in group 8B.

Question 37

Lithium has two naturally occurring isotopes,⁶Li and ⁷Li .The atomic weight of lithium is 6.941.Which of the following statements concerning the relative abundance of each isotope is correct?

A) The abundance of ⁷Li is greater than ⁶Li.
B) The abundance of ⁷Li is less than ⁶Li.
C) The abundance of ⁶Li is equal to the abundance of ⁷Li.
D) Not enough data is provided to determine the correct answer.
E) Based on the atomic mass,only ⁷Li occurs naturally.

Question 38

Naturally occurring element X exists in three isotopic forms: X-28 (27.979 u,77.03% abundance),X-29 (28.976 u,8.00% abundance),and X-30 (29.974 u,14.97% abundance).Calculate the atomic weight of X.

A) 29.64 u
B) 28.36 u
C) 29.05 u
D) 29.60 u
E) 27.38 u

Question 39

The elements in group 2A are known as the

A) alkaline earth metals.
B) halogens.
C) transition metals.
D) alkali metals.
E) noble gases.

Question 40

An element consists of three isotopes.The abundance of one isotope is 92.21% and its atomic mass is 27.97693 u.The abundance of the second isotope is 4.70% and its atomic mass is 28.97649 u.The atomic mass of the third isotope is 29.97376 u.What is the atomic weight of the element?

A) 28.09 u
B) 28.98 u
C) 28.96 u
D) 29.87 u
E) 29.07 u

Question 41

What is the name of the halogen in period 4?

A) iodine
B) bromine
C) barium
D) neon
E) potassium

Question 42

C₂H₂F₄ is the formula for two possible molecules.C₂H₂F₄ is an example of a(n)

A) structural formula.
B) empirical formula.
C) condensed formula.
D) space-filling model.
E) molecular formula.

Question 43

Identify the ions present in Na₂SO₄.

A) Na⁺,S^2-,and O^2-.
B) Na⁺,S²⁺,and O^2-
C) Na⁺ and SO₄^2-
D) Na⁺,S^2-,and O²⁺ .

Question 44

The formula of acetic acid,CH₃CO₂H,is an example of a(n)

A) condensed formula.
B) empirical formula.
C) structural formula.
D) ionic compound formula.
E) mass spectrum.

Question 45

Which of the following formulas is not correct?

A) AlPO₄
B) KClO₄
C) CaS
D) Na(NO₃)₂
E) Na₂HPO₄

Question 46

Identify the ions in CaHPO₄

A) Ca²⁺ and PO₄^3-
B) Ca²⁺ and HPO₄^2-
C) Ca⁺ and HPO₄^-
D) Ca³⁺ and HPO₄^3-
E) Ca²⁺,H⁺,P^3-,and O^2-

Question 47

Which atom is most likely to form a 2+ ion?

A) scandium
B) calcium
C) aluminum
D) oxygen
E) fluorine

Question 48

What is the charge on the copper ion in Ga₃P?

A) 3-
B) 1-
C) 0
D) 1+
E) 3+

Question 49

Which of the following elements is not a metalloid?

A) boron
B) selenium
C) germanium
D) arsenic
E) silicon

Question 50

What is the correct formula for an ionic compound that contains barium ions and carbonate ions?

A) BaCO₃
B) Ba(HCO₃)₂
C) Ba₂CO₃
D) Ba₂C
E) Ba(CO₃)₂

Question 51

What is the common name of the group that has as one of its members the element which contains 4 protons in its nucleus?

A) transition metals
B) halogens
C) noble gases
D) alkaline earth metals
E) alkali metals

Question 52

What is the correct formula for potassium dihydrogen phosphate?

A) KH₂PO₄
B) K₂HPO₄
C) K₂H₂PO₄
D) K₃H₂PO₄
E) KH₂P

Question 53

What is the correct formula for calcium nitrate?

A) CaN
B) Ca₃N₂
C) CaNO₂
D) Ca₃(NO₃)₂
E) Ca(NO₃)₂

Question 54

The formula for aluminum chloride is

A) AlCl₃.
B) AlCl.
C) Al₂Cl.
D) AlCl₄.
E) AlCl₂.

Question 55

Which element is most likely to form a 2- ion?

A) K
B) Mg
C) P
D) Br
E) S

Question 56

Bismuth(III)sulfide is an ionic compound formed from Bi³⁺ and S^2-.What is the correct way to represent the formula?

A) BiS⁺
B) BiS₂^-
C) Bi³⁺S^2-
D) Bi₂S₃
E) Bi₆S₉

Question 57

For a nonmetal in Group 6A of the periodic table,the most common monatomic ion will have a charge of ____.

A) 3-
B) 2-
C) 1-
D) 1+
E) 2+

Question 58

What is the correct formula for cobalt(III)bromide?

A) CoBr
B) CoBr₃
C) Co₂Br₃
D) Co₃Br₂
E) Co₃Br

Question 59

Sodium sulfate has the chemical formula Na₂SO₄.Based on this information,the formula for chromium(III)sulfate is ____.

A) CrSO₄
B) Cr(SO₄)₃
C) Cr₂(SO₄)₃
D) Cr₂SO₄
E) Cr₃(SO₄)₂

Question 60

What charge is likely on a monatomic silver cation?

A) 2-
B) 1-
C) 1+
D) 2+
E) 3+

Question 61

What is the formula for the compound which forms between the ammonium and bromide ions?

A) NH₃Br
B) NH₄Br
C) NH₃Br₂
D) NH₄Br₂
E) (NH₄)₂Br

Question 62

The correct name for Co²⁺ is

A) monocobalt ion.
B) cobalt(II)ion.
C) cobalt ion.
D) cobalt(I)ion.
E) cobalt.

Question 63

A 0.0050 g sample of boron contains ____ B atoms.

A) 4.6 $\times$ 10^-4
B) 7.7 $\times$ 10^-28
C) 2.8 $\times$ 10²⁰
D) 3.1 $\times$ 10²¹
E) 3.3 $\times$ 10²²

Question 64

What mass of Al contains the same number of atoms as 3.0 g Pb?

A) 23 g
B) 0.014 g
C) 3.0 g
D) 0.39 g
E) 0.11 g

Question 65

What is the correct name for SrCl₂?

A) strontium dichloride
B) strontium dichlorine
C) strontium(II)dichloride
D) strontium chloride
E) iodine strontide

Question 66

What is the correct name for Cl₂O₇?

A) dichlorine heptoxide.
B) chlorine oxide.
C) dichloride heptoxide.
D) dichlorine heptaoxygen.
E) chlorine heptaoxygen.

Question 67

What is the correct name for Ca(CH₃CO₂)₂?

A) calcium(II)carbonate
B) calcium carbonate
C) calcium acetate
D) acetic calcide
E) calcium carbonide

Question 68

The molar mass of platinum is 195.08 g/mol.What is the mass of 1.00 $\times$ 10² Pt atoms?

A) 8.51 $\times$ 10^-25 g
B) 3.24 $\times$ 10^-24 g
C) 1.67 $\times$ 10^-22 g
D) 3.24 $\times$ 10^-22 g
E) 3.24 $\times$ 10^-20 g

Question 69

What is the common name for PH₃?

A) laughing gas
B) hydrazine
C) nitroglycerin
D) ammonia
E) phosphine

Question 70

What is the correct name for NH₄NO₃?

A) ammonia hydrogen nitrate
B) ammonia hydrogen nitride
C) ammonium nitric acid
D) ammonium nitrate
E) ammonium nitride

Question 71

What is the molecular mass of cyclooctane,C₈H₁₆?

A) 13.02 g/mol
B) 1553.53 g/mol
C) 97.10 g/mol
D) 112.21 g/mol
E) 28.14 g/mol

Question 72

Predict which ionic compound has the highest melting point.

A) KBr
B) MgO
C) RbI
D) CaBr₂
E) CsCl

Question 73

Which of the following statements concerning ionic compounds is/are correct?
1)As ion charges increase,the attraction between oppositely charged ions increases.
2)Although not electrically conductive like metals,ionic compounds are malleable.
3)Positive and negative ions are attracted to each other by electrostatic forces.

A) 1 only
B) 2 only
C) 3 only
D) 1 and 3
E) 1,2,and 3

Question 74

A 1.583 g sample of an element contains 8.959 $\times$ 10²¹ atoms.What is the element symbol?

A) Pd
B) Te
C) La
D) Sb
E) Rh

Question 75

What is the correct formula for gallium(III)sulfate?

A) GaSO₄
B) Ga₂SO₄
C) Ga₃(SO₄)₂
D) Ga₂(SO₄)₃
E) Ga(SO₄)₂

Question 76

What is the mass of 0.71 mol Na?

A) 1.2 $\times$ 10^-24 g
B) 12 g
C) 16 g
D) 0.031 g
E) 32 g

Question 77

What is the symbol for an ion of an element which has 56 protons and 54 electrons.

A) Ba²⁺
B) Ba^2-
C) Xe²⁺
D) Xe^2-
E) Ds²⁺

Question 78

Calculate the number of moles in 0.48 g Cu.

A) 0.033 mol
B) 0.48 mol
C) 31 mol
D) 7.6 $\times$ 10^-3 mol
E) 1.3 $\times$ 10² mol

Question 79

What is the correct name for CCl₄?

A) carbon chlorine
B) tetracarbon chloride
C) carbon tetrachloride
D) carbon(IV)chloride
E) tetrachlorocarbide

Question 80

You have 2.50 g of each of the following elements: Ca,Cu,Cs,C,and Cr.Which sample contains the largest number of atoms?

A) Ca
B) Cu
C) Cs
D) C
E) Cr