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  • Question 1
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    Q.

    Which statement describes the earliest model of the atom?

    answer choices

    An atom is an indivisible hard sphere.

    An atom has a small, dense nucleus.

    Electrons are negative particles in an atom.

    Electrons in an atom have wave-like properties.

  • Question 2
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    Q.

    In all atoms of bismuth, the number of electrons must equal the

    answer choices

    number of protons

    number of neutrons

    sum of the number of neutrons and protons

    difference between the number of neutrons and protons

  • Question 3
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    Q.

    Which symbol represents a particle that has a mass approximately equal to the mass of a neutron?

    answer choices

    α

     β\beta  +

     β\beta 

    p

  • Question 4
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    Q.

    An orbital is a region in an atom where there is a high probability of finding

    answer choices

    an alpha particle

    an electron

    a neutron

    a positron

  • Question 5
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    Q.

    Which electron shell in an atom of calcium in the ground state has an electron with the greatest amount of energy?

    answer choices

    1

    2

    3

    4

  • Question 6
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    Q.

    As the elements in Period 2 are considered in order from lithium to fluorine, there is an increase in the

    answer choices

    atomic radius

    electronegativity

    number of electron shells

    number of electrons in the first shell

  • Question 7
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    Q.

    Which element is classified as a metalloid?

    answer choices

    boron

    sulfur

    potassium

    xenon

  • Question 8
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    Q.

    Strontium and barium have similar chemical properties because atoms of these elements have the same number of

    answer choices

    protons

    neutrons

    electron shells

    valence electrons

  • Question 9
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    Q.

    Which element has metallic bonds at room temperature?

    answer choices

    bromine

    cesium

    krypton

    sulfur

  • Question 10
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    Q.

    What is the number of electrons shared between the atoms in a molecule of nitrogen, N2?

    answer choices

    8

    2

    3

    6

  • Question 11
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    Q.

    Given the equation representing a reaction: H + H → H2

    What occurs during this reaction?

    answer choices

    A bond is broken and energy is absorbed.

    A bond is broken and energy is released.

    A bond is formed and energy is absorbed.

    A bond is formed and energy is released

  • Question 12
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    Q.

    An atom of which element has the strongest attraction for electrons in a chemical bond?

    answer choices

    chlorine

    carbon

    phosphorus

    sulfur

  • Question 13
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    Q.

    Which statement describes a mixture of sand and water at room temperature?

    answer choices

    It is heterogeneous, and its components are in the same phase.

    It is heterogeneous, and its components are in different phases.

    It is homogeneous, and its components are in the same phase.

    It is homogeneous, and its components are in different phases.

  • Question 14
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    Q.

    According to the kinetic molecular theory, which statement describes the particles in a sample of an ideal gas?

    answer choices

    The particles are constantly moving in circular paths.

    The particles collide, decreasing the total energy of the system.

    The particles have attractive forces between them.

    The particles are considered to have negligible volume.

  • Question 15
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    Q.

    Which sample of matter has the greatest distance between molecules at STP?

    answer choices

    N2(g)

    C6H14(l)

    NH3(aq)

    C6H12O6(s)

  • Question 16
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    Q.

    Which electron configuration represents the electrons in an atom of sulfur in an excited state?

    answer choices

    2 – 8 – 6

    2 – 7 – 7

    2 – 8 – 7

    2 – 7 – 8

  • Question 17
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    Q.

    Which notations represent atoms that have the same number of protons but a different number of neutrons?

    answer choices

    H-3 and He-3

    S-32 and S-32

    Cl-35 and Cl-37

    Ga-70 and Ge-73

  • Question 18
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    Q.

    Which compound has covalent bonds?

    answer choices

    H2O

    Li2O

    Na2O

    K2O

  • Question 19
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    Q.

    At which temperature and pressure will a sample of neon gas behave most like an ideal gas?

    answer choices

    300. K and 2.0 atm

    300. K and 4.0 atm

    500. K and 2.0 atm

    500. K and 4.0 atm

  • Question 20
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    Q.

    The volumes of four samples of gaseous compounds at 298 K and 101.3 kPa are shown in the table below.


    Sample Compounds Volume (L)

    1 NH3(g) 44.0

    2 CO2(g) 33.0

    3 HF(g) 44.0

    4 CH4(g) 22.0


    Which two samples contain the same number of molecules?

    answer choices

    1 and 2

    1 and 3

    2 and 3

    2 and 4

  • Question 21
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    Q.

    Graphite and diamond are two forms of solid carbon at STP. These forms have

    answer choices

    different molecular structures and different properties

    different molecular structures and the same properties

    the same molecular structures and different properties

    the same molecular structures and the same properties

  • Question 22
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    Q.

    In the ground state, an atom of which element has seven valence electrons?

    answer choices

    sodium

    phosphorus

    nitrogen

    fluorine

  • Question 23
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    Q.

    Which information is sufficient to differentiate a sample of sodium from a sample of silver?

    answer choices

    the mass of each sample

    the volume of each sample

    the reactivity of each sample with water

    the phase of each sample at room temperature

  • Question 24
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    Q.

    Which statement explains why NaBr is classified as a compound?

    answer choices

    Na and Br are chemically combined in a fixed proportion.

    Na and Br are both nonmetals.

    NaBr is a solid at 298 K and standard pressure.

    NaBr dissolves in H2O at 298 K.

  • Question 25
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    Q.

    Which substance can not be broken down by a chemical change?

    answer choices

    ammonia

    magnesium

    methane

    water

  • Question 26
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    Q.

    The degree of polarity of a covalent bond between two atoms is determined by calculating the difference in their

    answer choices

    atomic radii

    melting points

    electronegativities

    ionization energies

  • Question 27
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    Q.

    At STP, which property of a molecular substance is determined by the arrangement of its molecules?

    answer choices

    half-life

    molar mass

    physical state

    percent composition

  • Question 28
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    Q.

    Which ion in the ground state has the same electron configuration as an atom of neon in the ground state?

    answer choices

    Ca2+

    Cl-

    Li+

    O2-

  • Question 29
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    Q.

    The molar masses and boiling points at standard pressure for four compounds are given in the table below.


    Which compound has the strongest intermolecular forces?

    answer choices

    HF

    HCl

    HBr

    HI

  • Question 30
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    Q.

    Which particle model diagram represents xenon at STP?

    answer choices
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