In an ionic compound, the size of the ions affects the internuclear distance (the distance between the centers of adjacent ions), which affects lattice energy (a measure of the attractive force holding those ions together). Based on ion sizes, arrange these compounds by their expected lattice energy. Note that many sources define lattice energies as negative values. Please arrange by magnitude and ignore the sign. lattice energy = absolute value of the lattice energy CsF Greatest lattice energy (strongest bonds) Least lattice energy (weakest bonds) CsBr Answer Bank CsCl CsI

Cles [References] TUTOR Predicting Enthalpy of Reaction Using Bond Energies Use the References to access important values if needed for this question. Use average bond enthalpies (linked above) to calculate the enthalpy change for the following gas-phase reaction. 2H2(g) + O2(g) →→→2H2O(g) To analyze the reaction, first draw (on paper) Lewis structures for all reactant and product molecules. AHreaction Submit kl Show Approach Show Tutor Steps Submit Answer Try Another Version 10 item attempts remaining

Which of these has the following ionic compounds correctly arranged in order of decreasing ionic bond strength (lattice energy). MgO      AlP      NaCl

Using available information, determine the energy change for the formation of the IONIC solid lithium fluoride using lithium and fluorine atoms, i.e. Li(g) + F (g) → LiF(s). IE1(Li) = 500 kJ/mole EA(F) = -300 kJ/mole Lattice energy (LiF) = -1000 kJ/mole

The charges and sizes of the ions in an ionic compound affect the strength of the electrostatic interaction between the ions and thus the strength of the lattice energy of the ionic compound. Arrange the compounds according to the magnitudes of their lattice energies based on the relative ion charges and sizes. Highest lattice energy Lowest lattice energy Answer Bank KCI MgO NaF MgF₂

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Which one of the following trends appears when considering lattice energies? Anion A) The higher the charge on the ions, the higher the lattice energy. Cation F- CI- Br- |- O2- B) The more ions present in an ionic compound, the smaller the lattice energy. Lit 1036 853 807 757 2925 Na+ 923 787 747 704 2695 C) The larger the distance between ions in the ionic compound, the higher the lattice energy. K+ 821 715 682 649 2360 Mg2+ 2957 2524 2440 2327 3791 D) In general, alkali metals have larger lattice energies than alkaline earth metals with the same anions. Ca2+ 2630 2258 2176 2074 3401 Al3+ 5215 5492 5361 5217 15,916

The charges and sizes of the ions in an ionic compound affect the strength of the electrostatic interaction between the ions and thus the strength of the lattice energy of the ionic compound. Arrange the compounds according to the magnitudes of their lattice energies based on the relative ion charges and sizes. (highest to lowest) Mgo,NaF,MgF2, and KCI

Predicting the relative lattice energy of binary ionic compounds In each row, pick the compound with the bigger lattice energy. Note: lattice energy is always greater than zero. Which compound has the bigger lattice energy? BaCh BaS Bel₂ KF O BeBr₂ CsF O 1/5