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Lewis Dot Structures: Neutral Compounds quiz #4

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  • What is the correct Lewis structure for phosphorus tribromide (PBr3)?
    PBr3 has phosphorus in the center, single bonded to three bromine atoms, each Br with three lone pairs, P with one lone pair.
  • What is the correct Lewis structure for the compound PBr3?
    PBr3 has phosphorus in the center, single bonded to three bromine atoms, each Br with three lone pairs, P with one lone pair.
  • Which electron dot formula correctly represents the covalent compound boron trichloride (BCl3)?
    BCl3 has boron in the center, single bonded to three chlorine atoms, each Cl with three lone pairs.
  • What is the correct Lewis structure for formaldehyde (CH2O)?
    CH2O has carbon in the center, double bonded to oxygen, and single bonded to two hydrogens; oxygen has two lone pairs.
  • For neutral molecules, which statements about covalent Lewis structures are true?
    Neutral molecules have all atoms with complete octets (except hydrogen), and the structure minimizes formal charges.
  • What is the Lewis structure for methylamine (CH3NH2)?
    CH3NH2 has a CH3 group single bonded to NH2, with one lone pair on N.
  • Answer the questions below about the highlighted atom in this Lewis structure:
    Determine the number of bonds and lone pairs on the highlighted atom to assess its octet and formal charge.
  • What is the Lewis structure for carbon dioxide (CO2)?
    CO2 has a central carbon atom double bonded to two oxygen atoms, each O with two lone pairs.
  • What is the Lewis structure for xenon tetrafluoride (XeF4)?
    XeF4 has xenon in the center, single bonded to four fluorine atoms, each F with three lone pairs, Xe with two lone pairs.
  • What is the Lewis structure for sulfur difluoride (SF2)?
    SF2 has sulfur in the center, single bonded to two fluorine atoms, each F with three lone pairs, S with two lone pairs.
  • What is the Lewis structure for phosphorus trichloride (PCl3)?
    PCl3 has phosphorus in the center, single bonded to three chlorine atoms, each Cl with three lone pairs, P with one lone pair.
  • What is the Lewis structure for xenon difluoride (XeF2)?
    XeF2 has xenon in the center, single bonded to two fluorine atoms, each F with three lone pairs, Xe with three lone pairs.
  • What is the Lewis structure for nitrogen tribromide (NBr3)?
    NBr3 has nitrogen in the center, single bonded to three bromine atoms, each Br with three lone pairs, N with one lone pair.
  • What is the Lewis structure for carbon tetrachloride (CCl4)?
    CCl4 has carbon in the center, single bonded to four chlorine atoms, each Cl with three lone pairs.
  • What is the Lewis structure for hydrazine (N2H4)?
    N2H4 has two nitrogen atoms single bonded to each other, each bonded to two hydrogens, each N with one lone pair.
  • Draw the Lewis structure of CHF and then determine if the molecule is polar or nonpolar.
    CHF has carbon in the center, single bonded to H and F; F is more electronegative, so CHF is polar.
  • What is the Lewis structure for borane (BH3)?
    BH3 has boron in the center, single bonded to three hydrogens; boron has six electrons, no lone pairs.
  • What is the Lewis structure for selenium dioxide (SeO2)?
    SeO2 has selenium in the center, double bonded to two oxygen atoms, each O with two lone pairs.
  • What is the Lewis structure for boron trichloride (BCl3)?
    BCl3 has boron in the center, single bonded to three chlorine atoms, each Cl with three lone pairs.
  • Draw the Lewis structure of NF3.
    NF3 has nitrogen in the center, single bonded to three fluorine atoms, each F with three lone pairs, N with one lone pair.
  • What is the Lewis structure for methanol (CH3OH)?
    CH3OH has a CH3 group single bonded to O, which is single bonded to H; O has two lone pairs.
  • What is the Lewis structure for phosphorus pentafluoride (PF5)?
    PF5 has phosphorus in the center, single bonded to five fluorine atoms, each F with three lone pairs.
  • What is the Lewis structure for silicon tetrachloride (SiCl4)?
    SiCl4 has silicon in the center, single bonded to four chlorine atoms, each Cl with three lone pairs.
  • What is the Lewis structure for sodium chloride (NaCl)?
    NaCl is shown as Na+ (no dots) and Cl- (eight dots around Cl).
  • What is the best Lewis structure for oxygen dichloride (OCl2)?
    OCl2 has oxygen in the center, single bonded to two chlorine atoms, each Cl with three lone pairs, O with two lone pairs.
  • What is the Lewis structure for bromine trifluoride (BrF3)?
    BrF3 has bromine in the center, single bonded to three fluorine atoms, each F with three lone pairs, Br with two lone pairs.
  • What is the Lewis structure for nitrous acid (HNO2)?
    HNO2 has H single bonded to O, which is single bonded to N, which is double bonded to another O; lone pairs on O atoms.
  • What is the Lewis structure of hydrogen cyanide (HCN)?
    HCN has H single bonded to C, which is triple bonded to N; N has one lone pair.
  • Draw the Lewis structure of PF5 and then determine its electron domain and molecular geometries.
    PF5 has phosphorus in the center, single bonded to five fluorine atoms; electron domain geometry is trigonal bipyramidal.
  • What is the Lewis structure for 1,2-dichloroethene (C2H2Cl2)?
    C2H2Cl2 has two carbons double bonded, each bonded to hydrogens and chlorines, with lone pairs on Cl.
  • What is the Lewis structure for nitrosyl chloride (NOCl)?
    NOCl has N single bonded to O and Cl, with a double bond to O; lone pairs on O and Cl.
  • What is the Lewis structure for silicon monoxide (SiO)?
    SiO has silicon double bonded to oxygen, with two lone pairs on O.
  • What is the Lewis structure for formaldehyde (H2CO)?
    H2CO has carbon in the center, double bonded to oxygen, and single bonded to two hydrogens; oxygen has two lone pairs.
  • Draw the Lewis structure of ammonia (NH3).
    NH3 has nitrogen in the center, single bonded to three hydrogens, with one lone pair on N.
  • What is the Lewis structure for selenium difluoride oxide (SeF2O)?
    SeF2O has selenium in the center, single bonded to two fluorine atoms and double bonded to oxygen; lone pairs on F and O.
  • What is the Lewis structure for oxygen dichloride (OCl2)?
    OCl2 has oxygen in the center, single bonded to two chlorine atoms, each Cl with three lone pairs, O with two lone pairs.
  • Draw the Lewis structure of methane (CH4).
    CH4 has carbon in the center, single bonded to four hydrogens.
  • Select the atoms drawn with valid Lewis dot structures.
    Valid structures show the correct number of valence electrons as dots around the atom symbol.
  • What is the Lewis structure for silane (SiH4)?
    SiH4 has silicon in the center, single bonded to four hydrogens.
  • What is the Lewis structure for fluorine gas (F2)?
    F2 has two F atoms sharing a pair of electrons (single bond), each with three lone pairs.