Concept explainers
(a)
Interpretation:
The Lewis structure for
Concept Introduction: Lewis structure is used to show the arrangement of atoms in the molecule. The lone pair of electrons are represented as dots above the symbol of the atoms of element.
The formal charge can be calculated by using the following expression as follows:
(b)
Interpretation: A Lewis structure for the molecule XeF2needs to be drawn.
Concept Introduction: Lewis structure is used to show the arrangement of atoms in the molecule. The lone pair of electrons are represented as dots above the symbol of the atoms of element.
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Principles of Modern Chemistry
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- (a) Which poisonous gas is evolved when white phosphorus is heated with Cone. NaOH solution? Write the chemical equation. (b) Write the formula of first noble gas compound prepared by N. Bartlett. What inspired N. Bartlett to prepare this compound? (c) Fluorine is a stronger oxidising agent than chlorine. Why? (d)Write one use of chlorine gas.arrow_forwardDraw a Lewis structure for(a) The cyclic silicate ion Si₄O₁₂⁸⁻(b) A cyclic hydrocarbon with formula C₄H₈arrow_forwardExplain in detail what is the type of bonding between NA+ and Cl- ions in NaCl?arrow_forward
- The first four ionization energies of an element X are 578, 1817, 2745, and 11,577 kJ·mol–1. What is the most likely formula for the most stable ion of Xarrow_forwardCompounds such as NaBH₄, Al(BH₄)₃, and LiAlH₄ arecomplex hydrides used as reducing agents in many syntheses.(a) Give the oxidation state of each element in these compounds.(b) Write a Lewis structure for the polyatomic anion in NaBH₄,and predict its shape.arrow_forwardConsider the elements Li, K, Cl, C, Ne, and Ar. From thislist, select the element that (a) is most electronegative,(b) has the greatest metallic character, (c) most readilyforms a positive ion, (d) has the smallest atomic radius,(e) forms π bonds most readily, (f) has multiple allotropes.arrow_forward
- Use principles of atomic structure to answer each of the following: (1] (a) The radius of the Ca atom is 197 pm; the radius of the Ca2* ion is 99 pm. Account for the difference. (b) The lattice energy of CaO(s) is –3460 kJ/mol; the lattice energy of K20 is –2240 kJ/mol. Account for the difference. (c) Given these ionization values, explain the difference between Ca and K with regard to their first and second ionization energies. Element First lonization Energy (kJ/mol) Second lonization Energy (kJ/mol) K 419 3050 Ca 590 1140 (d) The first ionization energy of Mg is 738 kJ/mol and that of Al is 578 kJ/mol. Account for this difference.arrow_forwardCalculate the ionic resonance energy of HCl, given that: χH = 2.2 and χCl = 3.16.arrow_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_forward
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