Final answer:
The bonds in solid PbCl2 and an HCl molecule are both covalent. The Lewis structures for SbH3, XeF2, and Seg can be drawn based on their electron-pair geometries. Methanol and ethanol produce CO2 and H2O when they burn. The Lewis structures for CH4, C2H4, C2H6, H3CCCH, and HCCCCH can be written.
Step-by-step explanation:
The statement that "the bonds in solid PbCl2 are ionic; the bond in an HCl molecule is covalent" is incorrect. Both the bonds in solid PbCl2 and the bond in an HCl molecule are considered covalent. In solid PbCl2, the electrons are shared in a covalent bond between the Pb and Cl atoms. In an HCl molecule, the electrons are also shared in a covalent bond between the H and Cl atoms.
Lewis Structures:
(a) SbH3:
SbH3 has a trigonal pyramidal electron-pair geometry and molecular structure. The Lewis structure for SbH3 would show the Sb atom with three H atoms bonded to it, and one lone pair of electrons on the Sb atom.
(b) XeF2:
XeF2 has a linear electron-pair geometry and a bent molecular structure. The Lewis structure for XeF2 would show the Xe atom in the center with two F atoms bonded to it, and three lone pairs of electrons on the Xe atom.
(c) Seg:
The Lewis structure for Seg (a cyclic molecule with a ring of eight Se atoms) would show eight Se atoms bonded to each other in a ring, with a lone pair of electrons on each Se atom.
Combustion Reactions:
Methanol (H3COH) and ethanol (C2H5OH) both produce CO2 and H2O when they burn. The chemical equations for these combustion reactions using Lewis structures instead of chemical formulas would be:
Methanol:
H3COH + O2 -> CO2 + H2O
Ethanol:
C2H5OH + O2 -> CO2 + H2O
Lewis Structures:
CH4: A tetrahedral molecule with all single bonds.
C2H4: A planar molecule with a double bond between the C atoms and all single bonds to the H atoms.
C2H6: A planar molecule with single bonds between all C and H atoms.
H3CCCH: A linear molecule with a triple bond between the C atoms and all single bonds to the H atoms.
HCCCCH: A linear molecule with a triple bond between the C atoms and all single bonds to the H atoms.