MCQ Questions
Q.1.
Match each property to the appropriate subatomic particle.Drag each property into the correct bin.
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    PROTON: symbol p, +1 chargeNEUTRON: symbol n, 0 chargeELECTRON: symbol e, -1 charge
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    Attraction to the positively charged protons in the nucleus
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    protons in an atom
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    MASS OF ~1 AMU: neutron, protonMASS OF ~1/2000 AMU: electron
Q.2.
Chemical equilibrium is reached when _____.
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    The valence shell needs 8 electrons.
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    Weak bonds are transient and easily reversible.
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    the forward and reverse reactions occur at the same rate so that the concentrations of reactants and products remain the same
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    A chemical bond forms when two atoms transfer or share outer electrons to complete their outer shells.
Q.3.
The brackets are indicating a(n) _____ bond.
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    rotation can occur around single bonds.
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    hydrogen
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    single (nonpolar) covalent
Q.4.
Which statement about weak bonds is correct?
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    Weak bonds are transient and easily reversible.
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    A chemical bond forms when two atoms transfer or share outer electrons to complete their outer shells.
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    It can move out to a higher electron shell.It can stay in its original shell.
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    Attraction to the positively charged protons in the nucleus
Q.5.
What type of bond joins the carbon atom to each of the hydrogen atoms?
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    hydrogen
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    rotation can occur around single bonds.
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    double covalent
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    single (nonpolar) covalent
Q.6.
When an electron absorbs the required amount of light energy, it moves from a ________ electron shell to a __________ electron shell, which is _________________ the nucleus.
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    higher...lower...closer to
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    The valence shell needs 8 electrons.
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    All the atoms lie in a plane.
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    lower...higher...farther from
Q.7.
Electrons are held in an atom by attraction to what particle or location?
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    an attraction between ions of opposite charge
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    It can move out to a higher electron shell.It can stay in its original shell.
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    The valence shell needs 8 electrons.
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    Attraction to the positively charged protons in the nucleus
Q.8.
Without making or breaking bonds, the pictured molecule can change its shape because ...
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    single (nonpolar) covalent
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    rotation can occur around single bonds.
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    covalent
Q.9.
Changing the number of _____ would change an atom into an atom of a different element.
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    are different ions
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    electrons in two orbitals.
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    both (a) and (b).
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    protons in an atom
Q.10.
A(n) _____ refers to two or more atoms held together by covalent bonds.
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    ionic
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    hydrogen
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    molecule
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    element
Q.11.
When an electron loses a discrete amount of energy, it moves from a ________ electron shell to a ______ electron shell, which is _____________ the nucleus.
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    All the atoms lie in a plane.
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    lower...higher...farther from
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    The valence shell needs 8 electrons.
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    higher...lower...closer to
Q.12.
The ammonia molecule in the diagram has the observed bond orientation because ... N has 7 protons in its nucleus.N has four pairs of electrons in the valence shell.electrons repel one another.All of the above.None of the above.
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    double covalent
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    4, 1, 2, 3
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    single (nonpolar) covalent
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    All of the above.
Q.13.
In a double covalent bond, a carbon atom shares ...
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    electrons in two orbitals.
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    All the atoms lie in a plane.
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    2 electrons.
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    Weak bonds are transient and easily reversible.
Q.14.
What can happen to an electron when sunlight hits it?Select all that apply.
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    PROTON: symbol p, +1 chargeNEUTRON: symbol n, 0 chargeELECTRON: symbol e, -1 charge
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    It can move out to a higher electron shell.It can stay in its original shell.
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    A chemical bond forms when two atoms transfer or share outer electrons to complete their outer shells.
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    Attraction to the positively charged protons in the nucleus
Q.15.
The atomic number of sulfur isSulfur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulfur atom, predict the molecular formula of the compound.
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    All the atoms lie in a plane.
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    lower...higher...farther from
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    hydrogen
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    H2S
Q.16.
This atom can form up to _____ single covalent bond(s).
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    4
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    1
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    covalent
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    3