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Chemical Bonds HL

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  • What do sodium ions have in common with chloride ions?
    they both form covalent bonds
    they are both cations
    they both have the same sized charge
    they are both anions
  • Calcium (Ca) is in the second column of the periodic table and is classified as an alkaline earth metal. Which of the following formulas shows the ratio of a compound formed from calcium and iodine(I)?
    CaI2
  • Which hybridization is depicted in the molecule shown here?
    sp3
  • The Lewis (electron dot) structure of the ethanedioate ion is shown. Outline why all the C–O bond lengths in the ethanedioate ion are the same length
    electrons delocalized «across the O–C–O system» or RESONANCE
  • Which of the following is the definition of an allotrope?
    Different numbers of neutrons but same protons
    2 or more different physical forms in which an element exist
    Different states of a compound
    The same chemical formula but a different structure
  • A chemical formula includes the symbols of the elements in the compound and subscripts that indicate
    the number of atoms or ions of each type
  • What is the sum of the charges in a compound?
    0
  • Best explanation here that graphite is softer than diamond
    graphite is in a tetrahedral arrangement
    layers can slide/move
    every carbon atom has a strong bond to the other
    the carbons have 4 bonds
  • How many covalent bonds does graphite have?
    3
  • Which of the following molecules contains a double bond?
    water
    hydrogen fluoride
    ammonia
    carbon dioxide
  • Which statements regarding alloys are correct?
    II and III only
    I and II only
    I and III only
    I, II and III
  • what is the formula of aluminum carbonate?
    Al2(CO3)3
  • How many resonance structures are there of ozone?
    1
    3
    2
    4
  • Which pairs of words correctly completes the statement? Ionic compounds form when____ and _____ react.
    metals ; nonmetals
  • What is the chemical formula for diamond?
    C(s)
  • What is the name of the compound SrSO4
    strontium sulfate
  • Which molecule is most polar?
    CClF 3
    CCl 4
    CHF 3
    CF 4
  • Which compound has the shortest C–N bond?
    (CH3)3CNH2
    CH3NH2
    CH3CN
    CH3CHNH
  • Which intermolecular force does NOT exist when KF is dissolved in NH3?
    ion-dipole
    hydrogen bond
    dipole-dipole
    ion-induced dipole
  • Which of the following does NOT hydrogen bond?
    CH3F
    CH3OH
    CH3NH2
    HF
  • Which of the following would you expect to have the highest melting point?
    iodine
    chlorine
    fluorine
    bromine
  • What is the suffix for all binary ionic compounds of representative elements?
    -ide
    -gen
    -ite
    -ate
  • The molecule of oxygen contains one σ and one π bond. How do p orbitals in the O atoms overlap to produce the π bond?
    Sideways overlap results in high electron density above and
    Sideways overlap results in high electron density along the
    End-to-end overlap results in high electron density above an
    End-to-end overlap results in high electron density along th
  • Which of the molecules obeys the octet rule?
    O3
    BH3
    PCl5
    NO2
  • Why is CHCl3 more polar than CCl4?
    CCl4 is symmetric and therefore no net dipole; CHCl3 is asymmetric
  • Charlie claims that a single sodium ion and a single oxygen ion do not bond together to form a stable binary ionic compound. Is he correct? You must explain completely
    Charlie is correct. The sum of the charges of the two ions must be zero in order for them to form a stable ionic compound.
  • Which of the following molecules has a dipole moment?
    NF3
    F2
    SiH4
    BCl3
  • Which rule must be fulfilled by sharing or transferring electrons to create bonds in order for an element to be stable?
    octet rule
  • What is the metallic ion in the compound CuCl2?
    Cu2+
  • Give at least 2 (two) ways to refer to this adorable looking allotrope of carbon
    any 2: Bucky ball OR C-60 OR fullterene OR buckminsterfullerene
  • a) what is the hybridization of bonds? b)What is the bond order?
    electron and molecular geometry is trigonal planar. It is sp2 hybridized and it has a bond order of 1.33
  • What name is given to a compound composed of two non-metals?
    Molecular
    Polyatomic ions
    Ionic
    Alloy
  • In the cyanide ion (CN–), the nitrogen has a formal charge of
    -2
    +2
    0
    -1
  • What is the arrangement of the bonds in diamond as shown in this structure?
    tetrahedral - (4 bonds each 109.5 degrees apart)
  • Name
    calcium phosphate [OR calcium phosphate (V)]
  • What is the electron and molecular geometry of chlorate ion? Is it polar?
    Electron: tetrahedral. Molecular : Trigonal pyramidal. : It is polar because it is both asymmetric and it is an anion. (draw please w lone pair on chlorinei
  • In the formation of the compound of sodium chloride
    a sodium atom donates an electron to a chlorine atom
  • Which of the following best describes the changes that Which of the following best describes the changes that occur in the forces of attraction between CO2 molecules as they change phase from a gas to a solid?
    CO2 molecules crystallize around a nucleation point
    C-O bonds are formed
    London (dispersion) forces operate to form the solid
    Ionic bonds between CO2 molecules are formed
  • In which pair do both compounds exhibit predominantly ionic bonding?
    RbCl and MgS
    SCl4 and HF
    Na2SO3 and NH3
    BaF and H2O
  • In the gaseous phase, which of the following diatomic molecules would be the most polar?
    CsCl
    NaCl
    LiF
    CsF
  • Which hybridization is depicted in the molecule shown here?
    sp
  • Consider the skeletal structure shown below: N—C—C—N Draw the Lewis structure and answer the following: How many of the atoms are sp hybridized?
    2
    1
    3
    4
  • What is the formula for the compound potassium sulfate?
    K2SO4
  • The hybridization of I in IF4– is
    sp2
    sp3
    d2sp3
    dsp3
  • In the molecule C2H4 the valence orbitals of the carbon atoms are assumed to be
    sp2 hybridized
    not hybridized
    sp hybridized
    sp3 hybridized
  • What is the chemical formula for the compound barium bromide?
    BaBr2
  • Why do ionic solids NOT conduct electricity?
    This is due to the fact that ions are not free to move in a solid as they are arranged in an ionic lattice.
  • Unknown element W has 2 valence electrons. Unknown element X has 7 valence electrons. Which formula shows the most likely outcome when elements W and X react?
    WX2
  • Which series shows the correct order of metallic bond strength from strongest to weakest?
    Mg > Rb > K > Na
    Na > K > Rb > Mg
    Rb > K > Na > Mg
    Mg > Na > K > Rb
  • How is the electron domain geometry of ammonia related to the hybridization of the N atom?
    sp2 hybrid produces a trigonal pyramidal electron domain
    sp2 hybridization produces a tetrahedral electron domain
    sp3 hybridization produces a tetrahedral electron domain
    sp3 hybrid produces a trigonal pyramidal electron domain
  • A trigonal bipyramidal molecule contains what hybridization
    dsp3
    sp3
    sp
    sp2
  • State the intermolecular forces present in all of the halogens in their standard states.
    London Dispersion Forces (Dispersion forces)
  • In paper chromatography, components of a mixture are separated according to which property?
    Electronegativity
    Melting point
    Solubility
    Intramolecular forces
  • Name all the intermolecular forces in HCl
    dipole-dipole and LDF only
  • What is the name of the compound Ni(NO3)2
    Nickel (II) nitrate
  • Which of the following would you expect to have the highest melting point?
    magnesium fluoride
    phosphorous trichloride
    dinitrogen oxide
    hydrogen chloride
  • Covalent bonds take place between
    two nonmetals
  • The hybridization of the central atom in XeF5+ is:
    sp2
    d2sp3
    dsp3
    sp3
  • What will the result be when a reaction between bismuth and fluorine takes place?
    BiF3
  • What is the electron and molecular geometry for carbon dioxide. From this data, is it polar?
    Electron: linear. Molecular: linear. - It is symmetric therefor NOT POLAR
  • What is the molecular geometry of the carbonate ion? What would be the angles?
    trigonal planar; 120 degrees
  • What is the formula for the compound formed when aluminum ions(Al 3+) and chloride ions (Cl -) unite?
    AlCl3
  • Atoms with greatly different electronegativity values are expected to form
    ionic bonds
    no bonds
    triple bonds
    double bonds
  • What would be the best use of graphite?
    electrode
    lubricant because it is soft and slippery with weak forces
    used in drill heads
    decorative stone for rings
  • What is the formula for the compound formed when a potassium ion(K+) and a sulfide ion (S-2) unite?
    K2S
  • what is the bond order of carbonate ion?
    1.5
    1.25
    1.67
    1.33
  • A trigonal planar molecule contains what hybridization
    sp3
    dsp3
    sp2
    sp
  • What is the chemical formula for calcium oxide?
    CaO
  • Which compound contains both ionic and covalent bonds?
    Na2O
    H2CO
    SiH4
    NaNO3
  • What is the electron geometry, molecular geometry and bond angles in PF3. Is it polar?
    electron = tetrahedral; molecular = trigonal pyramidal. angles - <109.5; polar
  • A white solid has a melting point of 2072   ∘ C 2072 ∘ C. It does not conduct electricity in the solid state, but does so in the molten state. Which type of structure is found in the solid material?
    metallic
    simple molecular
    ionic
    giant molecular
  • Which of the following has a pure covalent bond?
    H2O
    H2
    CCl4
    CO2
  • Which hybridization is being depicted in this valence electron configuration shown here?
    sp2
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