Concept explainers
Interpretation:
The polar bond and the covalent single bond length have to be given. The molecular formula of a binary compound and its electron-dot formula has to be drawn.
Concept introduction:
Polar bond: polar bond in which the bonding electrons are not shared equally and spend more time near one atom than the other
Non-polar: bond or molecule in which the centers of positive and negative charge coincide
Lewis structure otherwise known as Lewis dot diagrams or electron dot structures that show the bond between atoms and lone pairs of electrons that are present in the molecule. Lewis structure represents each atom and their position in structure using the chemical symbol. Excess electrons forms the lone pair are given by pair of dots, and are located next to the atom.
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Chapter 9 Solutions
Student Solutions Manual for Ebbing/Gammon's General Chemistry, 11th
- Bond Enthalpy When atoms of the hypothetical element X are placed together, they rapidly undergo reaction to form the X2 molecule: X(g)+X(g)X2(g) a Would you predict that this reaction is exothermic or endothermic? Explain. b Is the bond enthalpy of X2 a positive or a negative quantity? Why? c Suppose H for the reaction is 500 kJ/mol. Estimate the bond enthalpy of the X2 molecule. d Another hypothetical molecular compound, Y2(g), has a bond enthalpy of 750 kJ/mol, and the molecular compound XY(g) has a bond enthalpy of 1500 kJ/mol. Using bond enthalpy information, calculate H for the following reaction. X2(g)+Y2(g)2XY(g) e Given the following information, as well as the information previously presented, predict whether or not the hypothetical ionic compound AX is likely to form. In this compound, A forms the A+ cation, and X forms the X anion. Be sure to justify your answer. Reaction: A(g)+12X2(g)AX(s)The first ionization energy of A(g) is 400 kJ/mol. The electron affinity of X(g) is 525 kJ/mol. The lattice energy of AX(s) is 100 kJ/mol. f If you predicted that no ionic compound would form from the reaction in Part e, what minimum amount of AX(s) lattice energy might lead to compound formation?arrow_forwardWrite all resonance structures of chlorobenzene, C6H5Cl, a molecule with the same cyclic structure as benzene. In all structures, keep the CCl bond as a single bond. Which resonance structures are the most important?arrow_forwardMethylcyanoacrylate is the active ingredient in super glues. Its Lewis structure is In this molecule, which is the (a) weakest carbon-containing bond? (b) strongest carbon-containing bond? (c) most polar bond?arrow_forward
- How many electron dots should appear in the Lewis structures for each of the following polyatomic ions? a. ClO b. ClO2 c. S22 d. NH4+arrow_forwardConsider the pyrosulfate ion, S2O72-. It has no sulfur–sulfur nor oxygen–oxygen bonds. (a) Write a Lewis structure for the pyrosulfate ion using only single bonds. (b) What is the formal charge on the sulfur atoms for the Lewis structure you drew in part (a)? (c) Write another Lewis structure using six bonds and two O—S bonds. (d) What is the formal charge on each atom for the structure you drew in part (c)?arrow_forwardConsider the formate ion, HCO2-, which is the anion formed when formic acid lose an H+ ion. The H and the two O atoms are bonded to the central C atom. a) Draw the best Lewis structure for this ion. b) Are resonance structures needed to describe this structure? c) Would you predict that the C-O bond lengths in the formate ion would be longer or shorter relative to those in CO2?arrow_forward
- Acetylene gas (ethyne; HC≡CH) burns with oxygen in an oxyacetylene torch to produce carbon dioxide, water vapor, and the heat needed to weld metals. The heat of combustion for acetylene is −1259 kJ/mol. Calculate the C≡C bond energy. The average bond energies (kJ/mol) C―H 413 C―C 347 C═C 620 H―H 436 O―O 142 O═O 498 H―O 467 C―O 351 C═O 799arrow_forwardWhen drawing the Lewis structure of the HCC13 molecule, the structure should represent a total of 26 valence electrons. What is the best description of the complete Lewis structure of the molecule? Select one: AH atom should be in the center with single bonds to each Cl atom and a double bond to the C atom. A Cl atom should be in the center with a single bond to the C atom and a single bond to the H atom. AC atom should be in the center with a double bond to the H atom and double bonds to each Cl atom. AC atom should be in the center with single bonds to each Cl atom and a single bond to the H atom.arrow_forwardFor the following three Lewis structures, list whether they are correct or incorrect: alt-text for image above: The first image shows a proposed Lewis structure for Freon-13, CClF3, that has a central carbon singly bonded to a three chlorine atoms and a fluorine atom. Each chlorine and the fluorine have 3 lone pairs of electrons around them. The second image shows a proposed lewis structure for the nitrite ion, NO2-, as a central nitrogen atom between two oxygen atoms. The O atom on the left has three lone pairs of electrons and then a single bond between the N. The right O atom has two lone pairs of electrons and a double bond with the N atom. The N atom has a single lone pair of electrons in addition to the double and single bonds with oxygen atoms. The third image shows diazomethane, CH2N2, and the proposed Lewis structure has a carbon singly bonded to two H atoms, then doubly bonded to a nitrogen. The nitrogen is doubly bonded to the second nitrogen, and the second nitrogen has…arrow_forward
- Draw a Lewis structure for the following ions/molecules, including any resonance structures and/or formal charges. Place a box around any contributing resonance structures XeO4^-2, BrF5, CHF2CL What is the electron group geometry around the central atom for each of the above ions/molecules? For the above ions/molecules, what is the shape of the entire molecule/ion of the entire ion/molecule? Identify polar bonds with dipole arrows Indicate whether each of the ions/molecules is POLAR or NON-POLARarrow_forwardConsider the molecule CO. If the electronegativity of C is 2.5 and the electronegativity of O is 3.5: Group of answer choices the C≡O bond is polar; the C is electron rich and the O is electron poor. the C≡O bond is non-polar. the C≡O bond is polar; the C is electron poor and the O is electron rich. the C≡O bond is polar; both the C and the O are electron rich.arrow_forwardThe table below includes the bond enthalpy (the energy required to separate the diatomic molecule into its atoms) and the bond length for each diatomic molecule. Diatomic Molecule Bond Enthalpy (kJ/mol) Bond Length (pm) Cl2 243 199 O2 498 121 N2 945 110 Identify the observed trend between bond enthalpy and number of shared electrons: as the number of electrons shared between two atoms increases, the bond enthalpy ( increases / decreases / remains unchanged ). Identify the observed trend between bond length and number of shared electrons: as the number of electrons shared between two atoms increases, the bond length ( increases / decreases / remains unchanged ).arrow_forward
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