Concept explainers
Interpretation:
Electron dot structure for
Concept introduction:
Electron dot structure is a representation of covalent bonding that indicates where the valence shell electrons are in the molecule. Shared electron pairs are shown as lines and lone pairs are shown as dots.
Example:
Bond order describes, if a bond is single bond order is one, if it is double bond order is 2.
Bond length is the distance between the centers of two atoms joined by a covalent bond.
Higher bond order corresponds to shorter bond length.
The bond length and bond order of some molecules are listed below,
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General Chemistry: Atoms First
- 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_forwardUsing Lewis symbols and Lewis structures, diagram the formation of SiCl4 from Si and Cl atoms.arrow_forwardGalium (Ga) is an element in group III with atomic number 31. By referring to the Periodic Table, answer the following questions. Explain how the atomic radius of gallium differs from aluminium. Explain how the electronegativity of gallium differs from aluminium. Explain how the electronegativity of gallium differs from germanium. Explain how the ionisation energy of gallium differs from germanium. Explain how the ionisation energy of gallium differs from indium.arrow_forward
- Draw the Lewis structure of SO42". Calculate the formal charge of central atom.arrow_forwardHydrazine, N2H4, burns in oxygen as follows: N2H4 + O2 → N2 + 2H2O [The bond energies in kJ/mol are: N-H = 388; N-N 163; N≡N 944; O-H 463; O=O 496] Draw the chemical structures of the reactants and products and give the formula to calculate enthalpy change in a reaction, ΔH.arrow_forwardDraw Lewis structures for ozone and dioxygen. Using the data given below, qualitatively compare the bond enthalpies, bond orders, and bond lengths of these two compounds: O2 (g) --> 2O(g) ∆H = +498 kJ O(g) + O2(g) à O3(g) ∆H = -105 kJarrow_forward
- In a hydrogen molecule, the two hydrogen atoms are held together by a single bond with a bond energy of 436 kJ/mol of hydrogen. In other words, to break the H-H bonds in one mole of molecular hydrogen requires the expenditure of 436 kJ of energy. Using the balanced chemical equation for the formation of water from oxygen and hydrogen (shown above), and interpreting the stoichiometric coefficients as mole amounts, how much energy must be expended in breaking the H-H bonds? kJarrow_forwardAnswer the following questions that relate to the chemistry of nitrogen. (a) Two nitrogen atoms combine to form a nitrogen molecule, as represented by the following equation. 2 N(g) ® N2(g) Using the table of average bond energies below, determine the enthalpy change, AH, for the reaction. Average Bond Energy (k) mol-1) Bond N-N 160 N=N 420 N°N 950 (b) The reaction between nitrogen and hydrogen to form ammonia is represented below. N2(g) + 3 H2(g)® 2 NH3(g) AH° = -92.2 kJ Predict the sign of the standard entropy change, AS', for the reaction. Justify your answer. (C) The value of AG° for the reaction represented in part (b) is negative at low temperatures but positive at high temperatures. Explain.arrow_forwardAccount for the ability of nitrogen to form four bonds, as in NH4+.arrow_forward
- Part C The formal charge on Br in the Lewis structure is +2 and the formal charge on the O atoms is -1.. What is the average Br-O bond order?arrow_forwardWhat is the Lewis Structure for P4, its electron geometry, and molecular geometry?arrow_forwardWhat is the electron pair geometry of SO2?arrow_forward
- General Chemistry - Standalone book (MindTap Cour...ChemistryISBN:9781305580343Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; DarrellPublisher:Cengage Learning