The ionic model

Which properties are expected for the compound lithium bromide? A. Not soluble in water, low melting point, does not conduct electricity when solid, does not conduct electricity when molten B. Not soluble in water, low melting point, conducts electricity when…

Gallium forms a sulfate of formula $\ce{Ga2(SO4)3}$. (i) Both ionic and covalent bonding are present in this compound. State which particles are held together by each type of bond. (ii) Contrast covalent and ionic bonds in terms of what happens to the valence…

Magnesium carbonate and magnesium chloride are ionic compounds. (i) The Born-Haber cycle for magnesium chloride, $\ce{MgCl2}$, is shown with three boxes left empty. Annotate the cycle by writing the name of the process, or the formulas of the species present…

Both ionic and covalent bonding are present in sodium ethanedioate, $\ce{Na2C2O4}$. (i) Describe both types of chemical bonding present in this compound. Ionic bonding: Covalent bonding: (ii) Deduce a Lewis formula of the ethanedioate ion, $\ce{C2O4^2-}$.…

What is the charge of the monatomic ion usually formed by the element with the following electron configuration? $\ce{[Ne] 3s^2 3p^4}$ A. 2+ B. 2− C. 4+ D. 6+

Calcium ions and phosphate(V) ions combine to form an ionic compound. What is its formula? A. $\ce{CaPO4}$ B. $\ce{Ca2(PO4)3}$ C. $\ce{Ca3(PO4)2}$ D. $\ce{Ca3(PO3)2}$

Which row shows the correct formula of aluminium sulfide and the electron configuration of each species in it? A. $\ce{Al3S2}$; Al species [Ne]; S species [Ar] B. $\ce{Al2S3}$; Al species [Ne] $3s^2\,3p^1$; S species [Ne] $3s^2\,3p^4$ C. $\ce{Al2S3}$; Al…

A white crystalline solid has the properties shown in the table. Property Observation Melting point 770 °C Electrical conductivity of the solid none Electrical conductivity when molten good Solubility in water soluble Which structure is consistent with these…

(i) For the carbonate ion, draw its Lewis formula. (ii) Write the chemical formula of ammonium carbonate. (iii) State why all three C–O bonds in the carbonate ion are identical. (iv) Using section 11 of the data booklet, predict the length of the C–O bonds in…

(i) Using sections 9 and 17 of the data booklet, and showing your working, deduce the type of bonding present in magnesium chloride, $\ce{MgCl2}$, and its percentage covalent character. (ii) Assuming purely ionic bonding, and using sections 9 and 12 of the…